WO2011010774A1

WO2011010774A1 - Lighting apparatus using light emitting diodes

Info

Publication number: WO2011010774A1
Application number: PCT/KR2009/005334
Authority: WO
Inventors: 김영환; 김민균
Original assignee: (주)로그인디지탈
Priority date: 2009-07-23
Filing date: 2009-09-18
Publication date: 2011-01-27
Also published as: TW201104915A; TWI397198B; KR100942234B1

Abstract

Disclosed is a light apparatus using light emitting diodes. The light apparatus using light emitting diodes of the present invention comprises: an LED array which is connected in parallel to an AC power source and is grouped into a plurality of LED groups including at least one LED and in which the LED groups are arranged serially and a tap is formed between the LED group and the LED group and in a cathode terminal of the last LED group; a reference voltage source for generating a reference voltage; and a switching unit for efficiently controlling peak current in each of the LED groups on the basis of the reference voltage according to an increase and decrease in AC input voltage. The present invention provides the lighting apparatus using the light emitting diodes having characteristics of high efficiency, high power factor, and low harmonics in a wide input voltage range.

Description

[Specifications

[Name of invention]

LED lighting device

Technical Field

The present invention relates to a lighting device using a light emitting diode (hereinafter referred to as LED), and more particularly to a light emitting diode lighting device having high efficiency, high range and low harmonic characteristics in a wide input voltage range.

Background Art

In general, it is widely used to adjust the brightness by changing the current supplied based on a constant voltage of the brightness adjustable LED lighting device. In addition, the current control method for sensing a current to flow a constant current is one of the widely used method.

In the LED lighting market, where the imminent and standard specifications of the commercialization market are gradually expanding, the important factors that are highlighted when designing and testing with LED lighting drive are the effects of HHD and THD (Total Harmonic Distortion). Satisfaction is emerging as the biggest issue (ISSUE).

First, various methods are used to increase the efficiency of the circuit in the LED driving device, and the increase is representative of using a switching mode power supply (SMPS). Currently, most of LED lighting circuits use SMPS. In this method, the electric efficiency is increased, but the complexity is increased and the switching mode is used, which generates high frequency noise, capacitors and inductors. It has disadvantages such as a decrease in life and a reverse in use.

Secondly, the most significant factor in the power concept is an indication of how much effective apparent power is consumed, which can be expressed as the ratio of the apparent power to the actual active power. As part of the smart grid, it is essential to the global trend to drastically reduce energy loss and energy consumption through efficient energy management.

Third, as the THD (Total Harmonic Distortion) becomes a factor (FACTOR), the factor of inversion is increasing, and it is managing the ratio with THD, not just the phase difference between voltage and current. To reverse this and to improve THD, PFC (Power Factor Correction) furnaces are complementary. Active PFC circuits produce output voltage stabilization and 'current reference waveforms'; control circuitry manages shunt switches to allow the inductor current to follow the reference waveform; It is divided into CCM (Continuous Current Mode), which keeps the signal equal. Power IC manufacturers around the world are producing ICs that support both, with a variety of features.

The LED lighting KS certification standard KSC7656 is as follows.

POWER FACTOR: Ratio of Real Power and Apparent Power

Equation 1: Actual power consumption is the product of average instantaneous voltage and instantaneous current

Equation 2: Apparent power is simply the root-mean-square voltage and current

^ A ᅳ ^ RMS ^ RMS

Equation 3: The inverse is usually expressed as a percentage and the ratio between R

PF

A

In the inductive case, both the voltage and current waveforms are sinusoidal and in phase, so the actual and apparent conditions are the same, resulting in a single power factor, but the inductive (reactive) load causes a phase shift between the current and the applied voltage. However, the current waveform maintains a sinusoidal curve because it exhibits linear impedance. The inverse at this time is shown in Equation 4. Equation 4: Apparent power at inductive impedance

Θ is a phase shift and is directly induced by impedance as shown in Equation 5.

Equation 5:

Where X _L is reactive impedance and _L is resistance impedance.

■ KS certification standard: 0.9 or more (0.85 or less for 5W)

O Total Harmonic Distortion

However, the largest and most commonly used linear reactive load is inductive. This inductive load causes phase lag. Power Factor Correction (PFC) methods include capacitors, fuses, and switching gears. The use of these capacitors generates harmonics in the fundamental current waveform by periodic layer discharge of layer currents. In addition, harmonic components play an important role in the LED lighting standard.

◊ KS Certification Standards: Refer to Table 1. (Ministry of Knowledge Economy: 2009-0009-Standard-Digital

-01)

<Table 1> Effective input power> 25W

Next, the LED driving method will be described.

The method of driving the LED in outputting light by flowing a current to the LED is There are various methods, such as driving with voltage or current, linear or switching method depending on switching.

1 is a circuit diagram illustrating an LED driving method using a series resistor as one commonly used. The current flowing through the LED is a voltage driven method determined by the applied voltage (Vi) and the resistance (R) value connected in series with the LED. Its simple structure makes it the most widely used structure, and it is not easy to control the current for the change of the input voltage and has the disadvantage of low power efficiency.

2 is a circuit diagram illustrating an LED driving method using an active device. It represents a driving furnace using a variable voltage source or a current source to control the current flowing in the LED device. The method of using a variable voltage source or a current source is similar in principle and uses a linear method or a switching method for voltage or current. Adjust it.

3 is a diagram illustrating a current controlled LED driving furnace using a series voltage controlled regulator. The current flowing through the LED is controlled by the transistor (TR) and an operational amplifier. The current flowing through the LED is controlled by feeding back the voltage applied to the sense resistor (RSENSE). Although the structure of the circuit is comparatively simple and the current flowing through the LED can be adjusted relatively stably, the electrical effect is reduced due to the voltage drop between the collector and the emitter of the transistor (TR) to control the current flowing through the LED. Has the disadvantage of being.

4 is a diagram illustrating a current controlled LED driving circuit using a switching regulator. It shows the structure that the current flowing through the LED is controlled by the switching furnace and the operational amplifier. The current flowing through the LED is adjusted by feeding back the voltage applied to the sense resistor (RSENSE). Unlike the linear method described above, since the switching method is used, power consumption in the switching block is reduced, so that the electrical effect is increased. Therefore, the switching method is widely used when relatively large power is consumed.

However, the current-controlled LED driving circuit using the switching regulator has to apply a switching regulator, which complicates the circuit and requires an inductor capacitor constituting the switching regulator. In this case, there is a problem that there is a risk of degradation of the effect.

[Detailed Description of the Invention]

Accordingly, the present invention has been made to solve the above-mentioned conventional problems, and the power efficiency, inverse and THD (Total Harmonic) can be simplified without the complexity of the structure of the conventional method and the use of capacitors, inductors, and power factor correction (PFC) ICs. It is an object of the present invention to provide a light emitting diode illumination device capable of improving and increasing distortion.

In addition, the present invention employs a structure that changes the connection to the LED white according to the input voltage, by maintaining a constant overall average power by controlling the current according to the wide input voltage range supplied to the LED, the output power with respect to the power supply LED lighting that maximizes the effect by maximizing the efficiency and satisfies the THD specification by improving the efficiency by switching the LED array according to the input voltage level without using an IC such as PFC. Another purpose is to provide a device.

In order to achieve the above object, the light emitting diode lighting apparatus according to the present invention is connected in parallel to an AC power supply, grouped into a plurality of LED groups consisting of at least one LED, and the plurality of LED groups are arranged in series. A LED array having tabs formed at the cathode terminals of the last LED group between each LED group; A reference voltage source for generating a reference voltage; It is connected between each tab of the LED array, and comprises a switching unit for controlling the peak current for each LED group based on a reference voltage in accordance with the increase and decrease of the AC input voltage. In addition, the LED lighting apparatus according to the present invention, the constant current source connected in parallel to the AC power source; It may further include a power compensation unit connected in parallel to the AC power supply for compensating that the output power of the LED array does not increase. Here, the switching unit and at least one switch connected in parallel between each tap and in series with each other; It is installed in correspondence with each switch to control the switching of each switch receiving the reference voltage from the reference voltage source to the non-inverting terminal (+) and the voltage of the lower map to the inverting input terminal (-). Is configured to include a comparator. The comparator receives a reference voltage from the reference voltage source as a non-inverting terminal (+), receives a voltage of a lower tap as an inverting input terminal (-), and uses a voltage input to the inverting input terminal (_) as a reference. If the voltage is lower than the voltage, the switch controls the switch to be on (closed state), while if the voltage input to the inverting input terminal (-) is higher than the reference voltage, the switch is turned off (open). Switching control.

In addition, the array structure of the LED group constituting the LED array is arranged by arraying dozens of LED chip die (Die) in one _¾ LED module, and a plurality of LEDs in the array as a group n (where n An array that divides into> 2) LED groups, forming a pattern so that adjacent LEDs belong to different groups, and making the necessary (n— 1) tabs (where the last n-th tap is the cathode terminal) and connecting them to the outside A structure can be used.

In this case, the array structure of the LED group constituting the LED array, the array of dozens of LED chip die in one LED mode in series, n groups of LEDs in a series of a plurality of LEDs as a group Form a pattern so that adjacent LEDs belong to different groups, and make the necessary (n-1) tabs (where the last n-th tap is the cathode terminal) and the anode and cathode terminals to connect to the outside It may be an array structure. Alternatively, the array structure of the LED group constituting the LED array, the array of dozens of LED chip die in a single LED module in series, and the series array in a plurality of parallel, a plurality of LEDs in each serial array As a group and divide into n LED groups, _t forming a pattern so that adjacent LEDs belong to different groups, and the necessary (n-1) interest tabs (where the last n-th tap is the cathode terminal) and the anode terminals. And an arrangement structure in which a cathode terminal is made and connected to the outside. In addition, the array structure of the LED group constituting the LED array is arrayed in series using a plurality of general-purpose LED modules consisting of only one LED chip, and the plurality of LED modules in the serial LED module array as a group By dividing into n (where n> 2) LED groups, forming a pattern so that adjacent LED modules belong to different groups, and (n-1) tabs where n is the last tap, the cathode terminal ) And an anode and cathode terminals can be used to configure the arrangement.

In addition, the array structure of the LED group constituting the LED array is arrayed in series using a plurality of general-purpose LED modules consisting of only one LED chip, and the serial LED module array is configured in plural in parallel, each series Within a LED module array, a plurality of LED modules are divided into a group of lower n (where n> 2) LEDs in a group, forming a pattern so that adjacent LEDs belong to different groups and having the necessary (η-ϋ tabs). (Where the last tap, η-th pin is the cathode terminal), and an array structure configured to make and connect the anode terminal and the cathode terminal.

In addition, the array structure of the LED group constituting the LED array is arranged in series using a plurality of general-purpose LED modules in which a plurality of LED chips are built in series and only the anode terminal and the cathode terminal are formed outside, and the series LEDs Within a module array, divide a group of LED modules into a group of n (here n> 2) LED modules, forming a pattern so that adjacent LED modules belong to different groups and (n-1) It is possible to use an array structure configured to make and connect four tabs (where the last tab, the nth tap is a cathode terminal), and an anode terminal and a cathode terminal.

In addition, the array structure of the LED group constituting the LED array is arranged in series using dozens of existing LED modules _z- plural LED chips are built in series and only the anode terminal and the cathode terminal are formed externally, It consists of a plurality of LED module arrays in parallel and divides the plurality of LED modules into a group of n (here n> 2) LEDs in a series within each serial LED module array, and adjacent LED modules belong to different groups. It is possible to use an array structure configured to form a pattern so as to form and connect the necessary (n-1) tabs (where the last tap, the nth wrap is a cathode terminal), and an anode terminal and a cathode terminal.

In addition, the array structure of the LED group constituting the LED array is arrayed in series using dozens of existing LED modules in which a plurality of LED chips are embedded in parallel and each of the LED chips has an anode terminal and a cathode terminal formed outside thereof. ， Its serial In a LED module array, a plurality of LED modules are grouped into a group of n (where n> 2) LED modules, and a pattern is formed so that adjacent LED modules belong to different groups and (n-1) You can use a map structure (where the last tap, the nth tap is the cathode terminal), and an array structure configured to make and connect the anode and cathode terminals.

In addition, the array structure of the LED group constituting the LED array is a plurality of LED chips are built in parallel and arrayed in series using dozens of existing LED modules formed on the outside of the anode terminal and cathode self for each LED chip, Configure a series of LED arrays in parallel, divide each LED module into a group of n (here n> 2) LEDs within each series of LED arrays, and adjacent LED modules in different groups. It is possible to use an arrangement structure formed by forming a pattern so as to belong to and forming and connecting the necessary (n-1) tabs (where the last tap, the nth tap is a cathode terminal), and an anode terminal and a cathode terminal. [Brief Description of Drawings]

1 is a view showing a LED driving circuit using a conventional series resistor. 2 is a view showing a LED driving furnace using a conventional active element. 3 is a diagram illustrating a current-controlled LED drive path using a conventional series voltage controlled regulator.

4 is a diagram illustrating a current controlled LED driving circuit using a switching regulator.

5 is a diagram illustrating a circuit configuration of a light emitting diode lighting apparatus having high efficiency, high power factor, and low harmonic characteristics in a wide input voltage range according to an exemplary embodiment of the present invention.

6 is a view showing an example of the arrangement structure of the LED group applied to the LED lighting apparatus according to the present invention.

7 to 13 are diagrams showing an example of the LED group arrangement structure of the LED array applied to the LED lighting apparatus according to the present invention, respectively. FIG. 14 is a diagram illustrating a representative input voltage versus input current characteristic for the configuration of FIG. 5.

FIG. 15 is a diagram showing harmonic component characteristics at an input voltage of rmsl98V for the configuration of FIG. 5. FIG.

16 is a diagram illustrating harmonic component characteristics at an input voltage of rais 220V for the configuration of FIG. 5.

FIG. 17 is a diagram showing harmonic component characteristics at an input voltage of rms 242V for the configuration of FIG. 5. FIG.

FIG. 18 is a diagram illustrating input power versus output power characteristics (efficiency) for the configuration of FIG. 5.

EXAMPLE

Hereinafter, a light emitting diode lighting apparatus according to a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

5 is a view showing a light emitting diode lighting apparatus according to a preferred embodiment of the present invention.

As shown in the figure, the LED lighting apparatus according to the present invention is connected to the AC power source AC and the bridge circuit unit 10 in parallel, and the LEDs in which a plurality of LED groups G1 to G4 are arranged in series. An array 20; A constant current source 30 connected in parallel to the AC power source AC and the bridge circuit section 10; A power compensator 40 connected in parallel with the AC power source AC and the bridge circuit unit 10 to compensate for the increase in output power of the LED array 20; A reference voltage source 50 for generating a reference voltage; In accordance with the increase and decrease of the AC input voltage is configured to include a switching unit 60 for effectively controlling the peak current (Peak current) for each LED group based on the reference voltage. The LED array 20 is grouped into a plurality of LED groups G1, G2, G3, G4 consisting of at least one LED, _{t between} each LED group G1, G2, G3, G4 and the last LED group G4. Taps T1, T2, T3, and T4 are formed at the output terminal (cathode terminal) of the

The switching section 60 is connected in parallel between each of the four taps Τ1, Τ2, Τ3, Τ4 (i.e., between the second to fourth LED groups G2, G3, G4) and in parallel with each other. Three switches (SW1, SW2, SW3) connected in series; It is installed corresponding to each switch (SW1, SW2, SW3) and inputs the reference voltage from the reference voltage source 50 to the non-inverting terminal (+). Each switch receiving the voltage of the lower tap with the inverting input terminal (-)

It consists of a comparator (^^ Ρ2, ΟΡ3) for switching control of (SW1, SW2, SW3).

That is _? The comparator OP1 receives the reference voltage as the non-inverting terminal (+), receives the voltage of the lower tap-in tap as the inverting input terminal (-), and the voltage input to the inverting input terminal (-) is lower than the reference voltage. The switch SW1, which is connected in parallel between the tap T1 and the tap T4, ie, between the second LED group G2, switches to control the switch SW1 to be on, while the inverting input terminal (-) When the input voltage is higher than the reference voltage, the switching control SW1 is turned off.

In addition, the comparator OP2 receives the reference voltage as the non-inverting terminal (+), receives the voltage of the lower tap T3 as the inverting input terminal (-), and inputs the voltage as the inverting input terminal (-). If the voltage is lower than the reference voltage, the switch SW2 connected in parallel between the tap T2 and the tap T3 (that is, between the third LED group G3) is controlled to be switched on. When the voltage input to the inverting input terminal (-) becomes higher than the reference voltage, the switching control is performed such that the switch SW2 is turned off.

In addition, the comparator OP3 receives the reference voltage as the non-inverting terminal (+), receives the voltage of the lower tap T4 as the inverting input terminal (-), and inputs the voltage as the inverting input terminal (-). If it is lower than the reference voltage, the switching control so that the switch SW3 connected in parallel between the tap T3 and the tap T4 (cathode terminal) [i.e. between the fourth LED group G4] is turned on. On the other hand, when the voltage input to the inverting input terminal (-) is higher than the reference voltage, the switching control so that the switch (SW3) is off (Off).

On the other hand, in the present embodiment, four LED groups are formed, but the LED group may be composed of two or more. In this case, if the number of LED groups is n (n = 2 or more), the number of taps is also (n-1) (where the nth tap, the last tap is the cathode terminal), and the switch and comparator are (n-1) The dog may be easily understood by those skilled in the art.

The operation of the circuit described above is as follows.

That is, since the AC input voltage input from the bridge circuit section 10 increases from a low voltage of the line period, when the AC input voltage is a low voltage, all of the switches SW1, SW2, and SW3 are on (i). In this case, the current path flows through the first LED group Gl and the switches SW1, SW2, and SW3 so that only the first LED group G1 emits light.

After that, when the AC input voltage increases and the voltage of the system T2 becomes higher than the reference voltage, the switch SW1 is turned off (ie, the open state) and the switches SW2 and SW3 are turned on. ) State (i.e. close state), so the current path flows through the first LED group (Gl), the second LED group (G2) and the switch (SW¾SW3). (G1, G2) will emit light.

Then, when the AC input voltage increases further and the voltage of the tap T3 becomes higher than the reference voltage, the switches SW1 and SW2 are turned off (that is, the open state) and the switch SW3 is turned on. State (i.e., close state), so that the current path flows through the first LED group (Gl), the second LED group (G2), the third group (G3), and the switch (SW3). The second, third and third LED groups G1, G2, and G3 emit light.

Subsequently, when the AC input voltage is further increased so that the voltage of the tap T4 becomes equal to or higher than the reference voltage, the switches SW1, SW2, and SW3 are turned off (that is, the open state), and accordingly the current The path flows through the first LED group (Gl), the second LED group (G2), the third group (G3), and the fourth LED group (G4), so the first, second, third and fourth LED groups (Gl _t G2, G3, G4) emit light.

After that, when the AC input voltage decreases so that the voltage of the tap T4 becomes lower than the reference voltage, the switch SW3 is turned on (i.e., the closed state) and the switches SW1 and SW2 are turned off. (Off) state (i.e. open state), so that the current path flows through the first LED group (Gl), the second LED group (G2), the third group (G3), and the switch (SW3). Therefore, the first, second and third LED groups (G1, G2, G3) emit light.

Subsequently, when the AC input voltage decreases further and the voltage of the tap T3 becomes lower than the reference voltage, the switch SW¾SW3 is turned on (ie, closed) and the switch SW1 is turned off. (I.e., open state), so that the current path will turn on the first LED group (Gl), the second LED group (G2), the switch (SW2) and the switch (SW3). As it flows through, the first and second LED groups G1 and G2 emit light. Subsequently, when the AC input voltage is further reduced so that the voltage of the tap T2 becomes less than the reference voltage, the switches SW1, SW2, and SW3 are turned on (i.e., closed). The current path flows through the first LED group (G1) and the switches (SW1, SW¾SW3) so only the first LED group (G1, G2) emits light.

With this principle, the LED group is turned on and off in turn using (n-1) maps (where the last tap, the nth tap is the cathode terminal) per cycle of the AC input power, to increase or decrease the AC input voltage. Accordingly, by effectively controlling the peak current of each LED array, the power factor can be maximized by minimizing the phase shift of harmonic components and currents generated during switching.

This structure can be freely designed and changed the number of (n-1) taps (where the nth tap, the last tap is the cathode terminal), the number of LED groups and the number of LEDs in the LED group, the performance of the existing LED lighting equipment And measurement specifications.

However, this sequential LED array switching method may feel a slight difference in light brightness for one cycle of about 8.33 ms (120 hz) due to the difference in LED array lighting time of each group. This possibility can be minimized by effectively arranging groups of LED arrays that are turned on / off to compensate for this disadvantage.

To this end, the present invention proposes an array structure of LED groups as follows.

I.e., _Σ in the first arrangement of LED groups, a custom (Custom) as to modeul screen, an array of dozens of LED chip die (Die) in one LED modeul, and a group of a plurality of LED in the array, Divide into n groups of LEDs, forming a pattern so that adjacent LEDs belong to different groups, and (n-1) tabs (ΤΓ η-l) where the last map is the cathode terminal. It is an array structure that is made and connected to the outside.

Here, as an example of such an arrangement structure, in FIG. 6, dozens of LED chip dies are arrayed in series in one LED module, and a plurality of LEDs are grouped into four LED groups in the serial array. ， Formed so that adjacent LEDs belong to different groups, and made three necessary taps (ΤΓ 3) (where the fourth tap, the last tap is a cathode terminal), an anode terminal and a cathode terminal to connect to the outside This is shown by way of example. Here, 1, 2, 3, and 4 represent LED groups.

In addition, as another example of such an arrangement structure, in FIG. 7, dozens of LED chip dies are arranged in series in one LED mode, and the series arrays are configured in plural in parallel. Divide the LEDs into groups of four LEDs, forming a pattern so that adjacent LEDs belong to different groups, and the required three taps (ΤΓΤ3) (where the last tap, the fourth tap is the cathode terminal) and the anode An example configuration is shown in which terminals and cathode terminals are made and connected to the outside. Here, 1, 2, 3, and 4 represent LED groups. On the other hand, the second LED group arrangement structure, using a general-purpose LED module that has at least one LED die built-in, the first LED of any one of the LED chip die in the LED module when the module is placed and designed It is connected to the group, and the other is assigned to the second LED group is an array structure for connecting each LED chip in one LED module to another LED group. Here, 1, 2, 3, and 4 represent LED groups.

Here, as an example of the arrangement structure as described above, in FIG. 8, arrays are arranged in series using dozens of existing LED modules consisting of only one LED chip, and a plurality of LED modules are grouped in the serial LED module array. The configuration consists of three LED groups, forming a pattern so that adjacent LED modules belong to different groups, and creating the necessary three taps (ΤΓΤ3) (where the fourth tap, the last tap is a cathode terminal), and an anode terminal and a cathode terminal. It is shown as an illustration. Here, 1, 3, and 4 represent LED groups.

Also, as another example of an array structure such as an diffuser, in FIG. 9, dozens of existing LED modules consisting of only one LED chip are arrayed in series, and the serial LED module arrays are configured in parallel, and each serial LED module array is arranged. Within this, a plurality of LED modules are divided into four LED groups, An example is shown in which a pattern is formed so that adjacent LEDs belong to different groups, and the required three taps (Τ1 to Τ3) (where the last tap, the fourth map is a cathode terminal), an anode terminal, and a cathode terminal are illustrated. have. Here, 1, 2, 3, and 4 represent LED groups.

In addition, as another example of such an arrangement structure, a plurality of LED chips are built in series, and only the anode terminal and the cathode terminal are arrayed in series using dozens of existing LED modules formed outside, and the series LED modules Divide the LED modules into groups of four LED modules within an array, forming a pattern so that adjacent LED modules belong to different groups, and the required three tabs (Τ1 to Τ3), where the last tab is the fourth The map is a cathode terminal) and a configuration for making the anode terminal and the cathode terminal is exemplarily shown. Here, 1, 2, 3, and 4 represent LED groups.

In addition, as another example of the above-described arrangement structure, a plurality of LED chips are built in series, and only the anode terminal and the cathode terminal are arrayed in series using dozens of existing LED modules formed outside, and the series LED modules The array consists of a plurality of parallel, each of the series LED module in the array of a plurality of LED modules in a group of four LED groups, the pattern is formed so that adjacent LED modules belong to different groups, and the three required Exemplary configurations are shown for the tap (ΤΓ 3) (where the last tap, the fourth tap is the cathode terminal) and the anode terminal and the cathode terminal. Here, 1, 2, 3, and 4 represent LED groups.

In addition, as another example of the above arrangement structure, a plurality of LED chips are built in parallel and arrayed in series using dozens of existing LED modules in which an anode terminal and a cathode terminal are formed outside for each LED chip. Within a series of LED module arrays, multiple LED modules are grouped into four LED module groups, patterned so that adjacent LED modules belong to different groups, and the required three taps (ΤΓΤ3) (where the last tab is the fourth The tab is a cathode terminal) and the configuration in which the anode terminal and the cathode terminal are made is exemplarily shown. Here, 1, 2, 3, and 4 represent LED groups.

In addition, as another example of the arrangement structure as described above, a plurality of LED chips are built in parallel and arrayed in series using dozens of existing LED modules in which an anode terminal and a cathode terminal are formed outside for each LED chip. Configure a series of parallel LED module arrays in parallel, divide each LED module into a group of 4 LEDs into a group of 4 LEDs within each serial LED module array, form a pattern so that adjacent LED modules belong to different groups, and Exemplary configurations of three tabs (ΤΓ 3) (where the last tap, the fourth tap is the cathode terminal) and the anode terminal and the cathode terminal are shown. Here, 1, 2, 3, and 4 represent LED groups.

The above-described structural arrangement can eliminate the difference in brightness that may occur in the application of the driving circuit according to the present invention by minimizing the physical distance of the LED light emitting position according to the proposed sequential LED flashing.

In conclusion, the LED driving furnace according to the present invention can eliminate the disadvantages of the device or circuit for controlling the current flowing through the LED because the number of LEDs connected in series is changed according to the size of the input voltage. . That is, the effect of the power consumed by the transistor TR in the structure of FIG. 3 can be prevented from being lowered, and the use of an inductor or a capacitor in the switching unit shown in FIG. 4, radiation of high frequency switching noise, etc. It can eliminate the disadvantages.

The LED driving furnace according to the present invention can satisfy each harmonic specification shown in Table 1 and Table 2 above, and in the case of Power Factor, the power factor is 0.98 or more within 10% of the input voltage variation. @ Fully satisfy the specification of luminaire above 25W. The average output power, or electrical efficiency, of the input power for each LED array is about 80%, which is 80 to 90% of the efficiency of the Switching Mode Power Supply (SMPS) compared to conventional LED driving furnaces. Has the advantage of satisfying the above-mentioned power factor correction (PFC) and harmonic component specifications while maintaining the dynamic standard, and can supplement the disadvantages of SMPS mode by providing price competitiveness and circuit simplicity. There is another advantage.

14 shows representative input voltage versus input current characteristics for the configuration of FIG. This is a drawing. The figure shows the current change according to the actual input voltage. It can be seen that the higher the input voltage is, the more the current changes due to the influence of the compensation circuit to keep the average power consumption constant. It can be seen that by controlling the current switching by the switching part of 5, the power factor and harmonic content can be improved.

FIG. 15 is a diagram showing harmonic component characteristics at an input voltage of rmsl98V for the configuration of FIG. 5; FIG. 16 is a diagram showing harmonic component characteristics at an input voltage of rms 220V for the configuration of FIG. Is a diagram showing the harmonic component characteristics at an input voltage of rms 242V for the configuration of FIG.

Table 3 below shows a comparison of the harmonic characteristics test for the configuration of FIG.

TABLE 3

15, 16, 17 and <Table 3> are harmonic output characteristics of the configuration of FIG. 5, and it can be seen that all harmonic components satisfy the specification at 25 W or less and 25 W or more of Table 1.

FIG. 18 is a diagram illustrating input power versus output power characteristics (efficiency) for the configuration of FIG. 5. FIG. 18 shows the effect of the configuration of FIG. 5 and shows that the average efficiency of input power to power consumption can be normalized to obtain an average efficiency of 80% or more within a 10% RMS input voltage range.

As described above, according to the present invention, it is possible to easily improve and increase power efficiency, inverse, and THD without the complexity of the circuit structure and the use of capacitors, inductors, and PFC ICs. In addition, the overall average power is kept constant by controlling the current according to the wide input voltage range supplied to the LED, maximizing the output power with respect to the supply power, maximizing the efficiency, and without using an IC such as a separate PFC. By switching the LED array efficiently according to the level of the input voltage, it is possible to meet the revolutionary power factor improvement and THD specification. In addition, by adopting the arrangement structure of the LED group constituting the LED array according to the present invention by minimizing the physical distance of the LED light emitting position according to the sequential LED lighting brightness difference that may occur when applying the driving circuit according to the present invention Can be eliminated.

On the other hand, the present invention is not limited to the above specific embodiments, but can be modified and modified in various ways without departing from the spirit of the present invention. If such modifications and changes fall within the scope of the appended claims, it will be obvious that they belong to the present invention.

【Industrial Availability】

According to the present invention configured as described above, it is possible to easily improve and increase power efficiency, power factor and THD without the complexity of the circuit structure, capacitors, inductors, and PFC ICs. In addition, the overall average power is kept constant by controlling the current according to the wide input voltage range supplied to the LED, maximizing the output power by maximizing the output power with respect to the supply power, and without using an IC such as a separate PFC. By effectively switching the LED array according to the level of the input voltage, it is possible to improve breakthrough inverse and meet the THD specification.

In addition, by adopting the arrangement structure of the LED group constituting the LED array according to the present invention by minimizing the physical distance of the LED light emitting position according to the sequential LED flashing brightness difference that may occur when applying the driving circuit of the present invention Can be eliminated.

Claims

[Range of request]

[Claim 1]

Connected in parallel to the AC power source, grouped into a plurality of LED groups consisting of at least one LED, the plurality of LED groups arranged in series, and mapped between each LED group and the cathode terminal of the last LED group, respectively An LED array formed thereon;

A reference voltage source for generating a reference voltage; . And a switching unit connected between the respective wraps of the LED array and controlling peak current for each LED group based on a reference voltage according to an increase and a decrease of the AC input voltage.

[Claim 2]

2. The power supply of claim 1, further comprising: a constant current source connected in parallel to the AC power supply; And a power compensation unit connected in parallel to the AC power source and compensating for an increase in output power of the LED array.

[Claim 3]

The method of claim 1, wherein the switching unit and at least one switch connected are connected in parallel between each _¾ the respective tap in series with each other;

And a comparator installed on the respective switches to control the switching of each switch receiving the reference voltage from the reference voltage source as the non-inverting terminal (+) and receiving the voltage of the lower tap as the inverting input terminal (-). Light emitting diode illumination device, characterized in that configured.

[Claim 4]

The _t comparator according to claim 3, wherein the comparator receives a reference voltage from the reference voltage source as a non-inverting terminal (+) and receives a voltage of a tap, which is a lower tap, as an inverting input terminal (-), to a inverting input terminal (ᅳ). If the input voltage is lower than the reference voltage, the switching control is performed such that the switch is turned on (closed state), while if the voltage input to the inverting input terminal (-) is higher than the reference voltage, the switch is turned off. Light emitting diode illumination device, characterized in that the switching control to be (Off) (open state).

iChung Soo Port 5]

The method according to any one of claims 1 to 4, wherein the LED array

The array structure of the LED group is composed of dozens of LED chip dies in one LED module, and a plurality of LEDs are grouped into n (here n> 2) LED groups in the array. The light emitting diode illumination device of claim 1, wherein the light emitting diode illumination device is an array structure in which a pattern is formed so that adjacent LEDs belong to different groups, and the necessary (n-1) tabs are connected to the outside.

[Claim 6]

The method of claim 5, wherein the array structure of the LED group constituting the LED array, the array of dozens of LED chip die in one LED module in series, a plurality of LEDs in the series array as a group n LED light dividing into groups of LEDs, the LED is characterized in that the array is configured to form a pattern so that adjacent LEDs belong to different groups, and make the necessary (n-1) tabs, anode terminals and cathode terminals to connect to the outside Device.

[Claim 7]

The array structure of the LED groups constituting the LED array according to claim 5, wherein j arrays of dozens of LED chip dies are arranged in series, and a plurality of parallel arrays are arranged in parallel. Divide the LED into n LED groups by grouping them into one group, forming a pattern so that adjacent LEDs belong to different groups, and making necessary (n-1) taps, anode terminals, and cathode terminals to connect to the outside. A light emitting diode lighting apparatus, characterized in that the arrangement structure.

[Claim 8]

The array structure of the LED group constituting the LED array is arrayed in series using a plurality of general-purpose LED modules consisting of only one LED chip, and the serial LED modules. Within a array, a group of LEDs is divided into n (where n> 2) LED groups, forming patterns so that adjacent LEDs belong to different groups and (n-1) tabs and anodes required Make terminals and cathode terminals Light emitting diode illumination device, characterized in that the arrangement structure configured to connect.

[Claim 9]

The array structure of the LED group constituting the LED assembly is arrayed in series using a plurality of general-purpose LED modules consisting of only one LED chip, and the serial LEDs according to any one of claims 1 to 4 Configure a plurality of module arrays in parallel, and divide the plurality of LED modules into a group of n (here n> 2) LEDs within each serial LED module array, and adjacent LED modules belong to different groups. A light emitting diode lighting apparatus, comprising: an array structure configured to form a pattern and make and connect necessary (n-1) wraps, anode terminals, and cathode terminals.

[Claim 10]

According to any one of claims 1 to 4, the array structure of the LED group constituting the LED array is a general-purpose LED module in which a plurality of LED chips are built in series and only the anode terminal and the cathode terminal are formed externally. Multiple arrays of LED modules in a series, divided into n (here n> 2) groups of LED modules within the series of LED arrays, and adjacent LED modules to different groups. A light emitting diode lighting apparatus, comprising: an array structure configured to form a pattern so as to belong to and form and connect necessary (n-1) tabs, an anode terminal, and a cathode terminal.

[Claim 11]

According to any one of claims 1 to 4, the arrangement structure of the LED group constituting the LED array is a conventional LED module in which a plurality of LED chips are built in series and only an anode terminal and a cathode terminal are formed externally. Arrays in series, using multiple dozens of LEDs, and configuring this series of LED module arrays in parallel, and in each of the series LED module arrays, a group of plural LED modules in n (where n> 2) LEDs. A light emitting diode lighting field comprising: an array structure configured to form a pattern so that adjacent LED modules belong to different groups, and make and connect the necessary (n-1) tabs, anode terminals, and cathode terminals. Chi.

ί Claim 12]

According to any one of claims 1 to 4, the array structure of the LED group constituting the LED array, a plurality of LED chips are built in parallel, and each of the LED chip anode terminal and cathode terminal to the outside Dozens of existing LED modules formed in series, arrayed in a series of multiple LED modules into a group of n (here n> 2) LED modules, and adjacent LED modules A light emitting diode lighting apparatus, comprising: an array structure configured to form patterns to belong to different groups and to make and connect necessary (n-1) tabs, anode terminals, and cathode terminals.

[Claim 13]

According to any one of claims 1 to 4, the array structure of the LED group constituting the LED array is, a plurality of LED chips are built in parallel and the anode terminal and the cathode terminal for each LED chip to the outside Array in series using dozens of existing LED modules formed, configure the serial LED module array in parallel, and group the plurality of LED modules within each serial LED module array as n (where n It is divided into> 2) LED groups, and the array structure configured to form a pattern so that adjacent LED modules belong to different groups and make and connect the necessary (n-1) tabs, anode terminals and cathode terminals. Light emitting diode lighting device.