WO2005109618A1 - 共振型スイッチング電源装置 - Google Patents
共振型スイッチング電源装置 Download PDFInfo
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- WO2005109618A1 WO2005109618A1 PCT/JP2005/007559 JP2005007559W WO2005109618A1 WO 2005109618 A1 WO2005109618 A1 WO 2005109618A1 JP 2005007559 W JP2005007559 W JP 2005007559W WO 2005109618 A1 WO2005109618 A1 WO 2005109618A1
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- Prior art keywords
- resonance
- switching
- circuit
- power supply
- output
- Prior art date
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Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/337—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only in push-pull configuration
- H02M3/3376—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only in push-pull configuration with automatic control of output voltage or current
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/0003—Details of control, feedback or regulation circuits
- H02M1/0032—Control circuits allowing low power mode operation, e.g. in standby mode
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/0048—Circuits or arrangements for reducing losses
- H02M1/0054—Transistor switching losses
- H02M1/0058—Transistor switching losses by employing soft switching techniques, i.e. commutation of transistors when applied voltage is zero or when current flow is zero
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/4815—Resonant converters
- H02M7/4818—Resonant converters with means for adaptation of resonance frequency, e.g. by modification of capacitance or inductance of resonance circuits
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
Definitions
- the present invention relates to a resonance-type switching power supply, and more particularly to a resonance-type switching power supply that can control a switching frequency according to an input voltage, an output voltage, and a load current.
- FIG. 4 is a circuit diagram showing a configuration of a conventional resonance type switching power supply circuit.
- an AC rectifier 103 is connected to a commercial power supply 101 via a noise filter 102.
- the rectified output from the AC rectifier 103 is smoothed by a smoothing capacitor 104.
- the DC output obtained by the smoothing capacitor 104 is supplied to a switching circuit 105 having switching elements 105A and 105B that perform a switching operation.
- the output of the switching circuit 105 is supplied to a resonance circuit 106 configured by connecting a primary winding 107A of a transformer 107 and a resonance capacitor 106A in series.
- the secondary winding 107B of the transformer 107 is connected to a rectifying / smoothing circuit 109 composed of diodes 108A and 108B and a capacitor 110.
- the rectifying / smoothing circuit 109 has output terminals 112A and 112B to which a control circuit 120 for controlling the switching operation of the switching circuit 105 is connected via a voltage feedback circuit 113 and supplies a DC output to the outside. I have.
- the voltage feedback circuit 113 is connected to an external control terminal 124 via a resistor 115. By inputting the control signal from the external control terminal 124 to the voltage feedback circuit 113, the resonance type switching power supply is adjusted to obtain a predetermined DC output voltage.
- the turns ratio is determined so that the output voltage on the secondary side of the transformer becomes a desired minimum voltage.
- the rectifying / smoothing circuit 10 The voltage output from 9 via output terminals 112A and 112B is input to the voltage comparator 113A in the voltage feedback circuit 113 and compared with the reference voltage Vref. The error voltage obtained by comparing the voltage comparator 113A with the reference voltage Vref is input to the control circuit 120 via the photo power blur 113B. The control output of the control circuit 120 is applied to the switching elements 105A and 105B of the switching circuit 105 to change the switching frequency.
- the external control terminal 124 is configured to receive a control voltage obtained by varying an output voltage and a control signal obtained from an input voltage fluctuation and a load fluctuation from the commercial power supply 101. Utilizing a control voltage and a control signal input to the external control terminal 124, the conventional resonance-type switching power supply device controls to generate a predetermined DC output voltage.
- a conventional resonant switching power supply device that detects a load current and controls the leakage inductance of the converter transformer according to the load current is disclosed in, for example, Japanese Patent Publication No. 9-163735. I have.
- Patent Document 1 JP-A-9-163735
- the resonance-type switching power supply according to the first aspect of the present invention includes a power supply circuit that outputs DC power
- a switching circuit having a plurality of switching elements to which DC power of the power supply circuit is inputted and which performs a switching operation complementarily;
- An output of the switching circuit is input, a series connection element of a first resonance capacitor and a resonance coil, a switching transformer, and a second resonance capacitor connected in parallel with a primary winding of the switching transformer.
- a resonance circuit having
- a rectifying / smoothing circuit to which a secondary output of the switching transformer is input, rectified and smoothed, and output;
- a detection transformer having a primary winding through which a current value substantially the same as the current flowing through the primary winding of the switching transformer, a rectifying circuit for rectifying a secondary output of the detection transformer, and the rectifier A current-to-voltage conversion circuit for converting the output of the circuit to a voltage;
- a control circuit to which each output from the power supply circuit, the rectifying / smoothing circuit, and the current detection circuit is input, and which controls a switching operation of the switching element in the switching circuit.
- a resonance-type switching power supply according to a second aspect of the present invention in the configuration of the first aspect, further includes a first load device connected to an output side of the rectifying and smoothing circuit.
- the control circuit may be configured to adjust a load value of the first load device according to an output of the resonance type switching power supply device.
- a resonance-type switching power supply device is characterized in that in the configuration of the first aspect,
- a regulated power supply having a positive electrode connected to the negative side of the output of the rectifying / smoothing circuit, and a second load device connected between the negative electrode of the regulated power supply and the positive side of the output of the rectifying / smoothing circuit.
- the control circuit adjusts the load value of the second load device according to the output of the resonance type switching power supply device.
- a resonance-type switching power supply includes:
- An output of the switching circuit is input, and includes a switching transformer, a first resonator connected in series to the switching transformer, and a second resonator connected in parallel to the switching transformer.
- Resonance circuit Resonance circuit
- a rectifying and smoothing circuit for rectifying and smoothing the output of the switching transformer
- a voltage detection circuit that detects a DC output voltage from the rectifying and smoothing circuit
- a current detection circuit for detecting a current force and a load current flowing through a primary winding of the switching transformer
- the control circuit may include a control circuit that controls a switching frequency of the switching circuit according to each output of the voltage detection circuit and the current detection circuit.
- the control circuit changes a switching frequency according to a change in a voltage input to the switching circuit. It may be configured to control.
- a resonance-type switching power supply according to a sixth aspect of the present invention is the configuration of the fourth aspect
- the first resonating unit is composed of a series connection element of a first resonating capacitor and a resonating coil connected to the output of the switching circuit, and the second resonating unit is connected in parallel with a primary winding of the switching transformer.
- the resonance frequency characteristic when the DC load current is large is formed by the series-connected elements of the first resonance unit, and the resonance frequency characteristic when the DC load current is small. May be formed by the second resonance capacitor of the second resonance section and the switching transformer together with the first resonance section.
- a resonance-type switching power supply device is characterized in that, in the configuration of the fourth aspect,
- the resonance circuit includes a switching transformer, a first resonance unit connected in series to a primary winding of the switching transformer, and a parallel connection to a primary winding of the switching transformer. And a second resonance unit connected to the second resonance unit.
- the resonance-type switching power supply device is characterized in that in the configuration of the fourth aspect,
- the resonance circuit includes a switching transformer, a first resonance unit connected in series to a primary winding of the switching transformer, and a second resonance unit connected in parallel to a secondary winding of the switching transformer. And may be configured to have a unit.
- a resonance-type switching power supply according to a ninth aspect of the present invention is the configuration according to the sixth aspect,
- a first load device is provided between DC output terminals for supplying an output to a load, and the first load device is a dummy load amount within a range of 0.1 to 0.2% of a maximum output supply power to the load. It may be configured to have
- a resonance-type switching power supply according to a tenth aspect of the present invention is characterized in that, in the configuration of the seventh aspect,
- a second load device is provided between DC output terminals for supplying an output to a load, and a regulated power supply for supplying a negative voltage to the second load device is connected in series, and the second load device is connected to the second load device.
- the configuration may be such that the dummy load amount is adjusted by the control circuit.
- a resonance-type switching power supply according to an eleventh aspect of the present invention is the configuration according to the sixth aspect
- the ratio between the maximum resonance frequency and the minimum resonance frequency in the use range of the resonance frequency of the resonance circuit be in the range of 1.2 to 2.5.
- the resonant switching power supply of the present invention even when the output voltage is varied over a wide range, a stable output voltage can be supplied to the load, and the power loss can be reduced. Can be planned.
- FIG. 1 is a circuit diagram showing a configuration of a resonant switching power supply device according to Embodiment 1 of the present invention.
- FIG. 2 is a resonance frequency formed in the resonance type switching power supply device according to the first embodiment.
- FIG. 9 is a waveform chart showing an example of a characteristic.
- FIG. 3 is a circuit diagram showing another configuration of the resonance type switching power supply according to the present invention.
- FIG. 4 is a circuit diagram showing a configuration of a conventional resonant switching power supply device. Explanation of symbols
- FIG. 1 is a circuit diagram showing a configuration of a resonant switching power supply device according to Embodiment 1 of the present invention.
- an AC rectifier 3 is connected to a commercial power supply 1 via a noise filter 2, and a rectified output from the AC rectifier 3 is smoothed by a smoothing capacitor 4.
- the DC output obtained by the smoothing capacitor 4 is supplied to a switching circuit 5 having switching elements 5A and 5B that perform a complementary switching operation.
- the output of the switching circuit 5 is supplied to a resonance circuit 6 including a primary winding 7A of a switching transformer 7 as a transformer, two resonance capacitors 6A and 6B, and a resonance coil 6L. .
- a rectifying / smoothing circuit 9 composed of diodes 8A and 8B, a capacitor 10, and a resistor 11 as a voltage detection circuit is connected to the secondary winding 7B of the switching transformer 7.
- a control circuit 20 for controlling the switching operation of the switching circuit 5 is connected to the rectifying / smoothing circuit 9.
- the rectifying / smoothing circuit 9 is provided with output terminals 12A and 12B for supplying a DC output to the outside.
- the resonance coil 6 L is connected in series to the first resonance capacitor 6 A, and the resonance coil 6 L is connected in parallel with the primary winding 7 A of the transformer 7.
- the second resonance capacitor 6B is connected.
- the values of the first resonance capacitor 6A and the resonance coil 6L connected in series are mainly determined when the load is heavy, that is, when the DC output load current is large, in the resonance type switching power supply device of the first embodiment. It is set corresponding to the lower switching frequency in the switching frequency range used. Also, the value of the second resonance capacitor 6B connected in parallel with the primary winding 7A of the switching transformer 7 has a light load. In the case, that is, when the DC output load current is small, the setting is made corresponding to the high switching frequency in the switching frequency range used in the resonance type switching power supply of the first embodiment.
- the first resonance capacitor 6A is 0.022 / zF
- the second resonance capacitor 6B is 0.022 / zF.
- the lower and upper switching frequencies in the switching frequency range are about 85 kHz and the higher switching frequency.
- the frequency is about 120kHz.
- the higher switching frequency is set higher, and the load device 21 is provided as a dummy load, which will be described later, so that the actually operating switching frequency is lowered and the operation is performed within a predetermined switching frequency range. It is also possible to make it.
- the lower resonance frequency is about 85 kHz
- the higher resonance frequency is about 120 kHz
- the load current, the load voltage, and the input to the switching transformer 7 are different.
- Power is input to the rectifying / smoothing circuit 9 via the switching transformer 7 according to the voltage and according to the resonance frequency characteristics obtained by integrating the characteristics of each element, and the desired DC output is supplied to the load.
- the resonance peak is formed at the lower resonance frequency of about 85 kHz by the first resonance capacitor 6 A and the resonance coil 6 L. . Further, in addition to the first resonance capacitor 6A and the resonance coil 6L, the second resonance capacitor 6B and the switching transformer 7 connected in parallel to the switching transformer 7 provide a higher resonance frequency. A resonance peak is formed at 120 kHz.
- FIG. 2 is a waveform diagram illustrating an example of a resonance frequency characteristic formed in the resonance type switching power supply device according to the first embodiment. In FIG. 2, the vertical axis is voltage [V], and the horizontal axis is frequency [kHz]. In the waveform diagram shown in FIG.
- the resonance frequency characteristic depends on the size of the load. change.
- the resonance frequency characteristic when the DC load current is large is determined mainly by the characteristics of a series connection element of the first resonance capacitor 6A and the resonance coil 6L.
- the DC load current power and the resonance frequency characteristic in that case are determined by switching the second resonance capacitor 6B connected in parallel with the switching transformer 7 in addition to the first resonance capacitor 6A and the resonance coil 6L. Determined by the characteristics of transformer 7.
- the lower or higher resonance peak in the resonance frequency characteristic is formed because the impedance of the switching transformer 7 is low and the first resonance capacitor 6A and the resonance coil 6L These series-connected elements mainly form a resonance peak of about 85 kHz. Also, when the DC load current is small, the higher resonance peak in the resonance frequency characteristic is formed because the impedance of the switching transformer 7 contributes, so the second resonance peak connected in parallel with the switching transformer 7 is formed.
- the impedance of the capacitor 6B is involved, and the combined impedance of the series connection element of the first resonance capacitor 6A and the resonance coil 6L and the parallel connection element of the second resonance capacitor 6B and the switching transformer 7 It is also a force that forms a resonance peak at about 125 kHz.
- the resonance frequency band actually used in the resonance circuit 6 has a frequency ratio between the maximum frequency and the minimum frequency of 1.2 to 2.5 in consideration of the stability of output characteristics and the like. It is preferable to perform control so as to fall within the range. For example, it is preferable to use the characteristics of a frequency band in a range from about 60 kHz to 150 kHz. More preferably, as described above, it is better to use the characteristics of the frequency band in the range from 85 kHz to 120 kHz. In this case, the frequency ratio is 1.4. Therefore, even if the values of the resonance capacitor and the resonance coil to be used are other than the set values described above, stable control can be performed by selecting a range where the frequency ratio is about 1.4 as the use region.
- the resonance type switching power supply of Example 1 when the output voltage is high and the load is heavy (when the DC load current is large), when the load is the lightest (when the DC load is large) (When the current is minimum), that is, when the DC output power to the load is large, or when the output voltage is low and the DC output load current is small.
- the resonance type switching power supply of Example 1 has resonance frequency characteristics having different peaks depending on the load, and the resonance frequency characteristics obtained by integrating the characteristics of each element such as the resonance circuit 6 have a wide band.
- the resonance type switching power supply of Example 1 can change the switching frequency more stably than in the case of the resonance frequency characteristic having only one peak, and can stably output the DC output.
- one value having one resonance peak is obtained by selecting the value of the second resonance capacitor 6 B according to the required DC load power. It is also possible to provide a device having resonance frequency characteristics.
- the resonant switching power supply of Embodiment 1 of the present invention is configured such that the peak position of the frequency characteristic changes according to the change in load, and includes the load on the secondary side of the switching transformer 7.
- the load is heavy and the DC output load current is large (the output power is large)
- the load is light and the DC output load current is small (the output power is )
- It is possible to output a desired DC power according to the resonance frequency characteristic having a wide band.
- a first load device 21 is connected between output terminals 12A and 12B.
- the second load device 25 is connected between the output terminal 12A and the output terminal 12B via a power supply 26.
- the positive terminal of the power supply 26 is connected to the output terminal 12B on the ground side, and the negative terminal of the power supply 26 is connected to the other output terminal 12A via the second load device 25.
- the first load device 21 and the second load device 25 are of a variable resistance type, and are configured to control a resistance value which is a load value by a control circuit 20!
- the control signal input from the external control terminal 24 is connected to the control input terminal “Vcnt IN” of the control circuit 20.
- the first load device 21 and the second load device 25 are connected to output terminals “Vcnt OUT1J,“ Vcnt OUT2 ”of the control circuit 20, respectively.
- the first load device 21 is used as a dummy load. Low DC output voltage In addition, when the load is light, a stable output voltage can be obtained by using the dummy load rather than by increasing the switching frequency. Therefore, the resonance-type switching power supply according to the first embodiment of the present invention has the following features.
- the first load device 21 is used.
- the resonance type switching power supply device As a specific example of the resonance type switching power supply device according to the first embodiment, a case where the maximum output voltage is 4 OV and the output current is 20 A will be described.
- the output voltage is changed from 40 V to 0.4 V in the resonance circuit 6 in which the resonance capacitor 6A is 0.022 ⁇ F, the resonance coil 6L is 157 ⁇ , and the resonance capacitor 6 ⁇ is 0.022 ⁇ F
- the switching frequency at which the output of the control circuit 20 is also from about 60 kHz to about 840 kHz. In the resonance circuit 6 configured as described above, the switching frequency is about 840 kHz, and the maximum switching frequency is too high, which is not practical.
- the switching frequency becomes about 300kHz, which is a practical frequency.
- the first load device 21 in the resonance-type switching power supply device of the first embodiment has the following functions.
- the output voltage is reduced by the control signal input to the external control terminal 24, if the load current is OA, the response is deteriorated due to the influence of the smoothing capacitor 10 and the like. Therefore, the output is increased by the first load device 21 until the output voltage reaches the target voltage, so that the output voltage is reduced almost instantaneously and stably in response to the signal from the external control terminal 24. It becomes possible. That is, when the load is light, it is possible to control the resistance value of the first load device 21 without increasing the switching frequency and to improve the responsiveness.
- the second load device 25 in the resonance type switching power supply device has the following functions.
- the output voltage can be set to 0 V indefinitely by the load control of the first load device 21.Since the force OV is the minimum set voltage value, the output voltage may vary depending on the dispersion of components in the device. May not reach OV. In such cases
- the output voltage can be reduced to 0V. That is, since the output from the second load device 25 is configured to be variable up to the negative voltage, it is possible to completely reduce the output voltage to OV even if the components of the device vary. .
- the power supply 26 which is an adjustment power supply for applying a negative voltage is connected in series to the second load device 25, By adjusting the load of the second load device 25, the DC output voltage can be reliably set to OV.
- the configuration of the resonance type switching power supply device according to the first embodiment an example has been described in which the first switching device and the second loading device 25 are configured as two blocks. It is also possible.
- a DC output voltage having an output terminal of 12 A is input to the terminal “V-FB” of the control circuit 20 via the resistor 11.
- the control circuit 20 detects the fluctuation of the DC output voltage and controls the switching frequency.
- the voltage feedback circuit is configured in the resonance type switching power supply device according to the first embodiment.
- the current detection circuit 16 detects the current flowing through the primary winding 7A of the switching transformer 7 and supplies the current to the control circuit 20. Specifically, assuming that the current flowing through the primary winding 7A of the switching transformer 7 is la, the primary winding 17A of the current detection detecting transformer 17 connected in series to the switching transformer 7 is substantially. The same la current flows. For example, assuming that the turns ratio of the detection transformer 17 is 100: 1, a current of IaZlOO flows through the secondary winding 17B of the detection transformer 17. The current IaZ100 flowing through the secondary winding 17B is converted into a voltage by a resistor 19, which is a current-voltage conversion circuit, and supplied to a terminal "Ocv" of a control circuit 20.
- the control circuit 20 performs current detection based on the voltage value input to the terminal “Ocv”.
- the current detection performed here mainly performs overcurrent detection.
- the control circuit 20 detects a predetermined overcurrent, the control circuit 20 enters a current limiting mode to limit the current.
- the voltage output from the current detection circuit 16 is input to a voltage feedback circuit via a capacitor 22 and a resistor 23 connected in series. That is, the output of the current detection circuit 16 is connected to the line from the resistor 11 which is the voltage detection circuit to the terminal “V-FB” of the control circuit 20!
- the configuration is such that the output from the current detection circuit 16 is input to the voltage feedback circuit constituted by the resistor 11 via the series connection element of the capacitor 22 and the resistor 23. For this reason, the control by current is added to the control by voltage (subtraction depending on the phase difference).
- the resonance-type switching power supply device of the first embodiment shown in FIG. 1 can improve the stability of the output voltage.
- the conventional resonant switching power supply device shown in FIG. 4 is controlled only by the voltage feedback circuit. May cause poor stability. Therefore, in the resonance type switching power supply device of the first embodiment, the current detected by the current detection circuit 16 is converted into a voltage, and the converted voltage is added to the voltage feedback circuit via the capacitor 22 and the resistor 23 so that the control circuit 20 Connected to the terminal “V-FB” of
- the resonance type switching power supply according to the first embodiment of the present invention in addition to detecting and controlling the voltage, the current is simultaneously detected and controlled, so that more accurate control is performed. It becomes possible.
- the resonance-type switching power supply device of the first embodiment can eliminate the overshoot or the undershoot from the set voltage and improve the stability of the output voltage.
- the capacitor 22 and the resistor 23 are connected in series. Equivalent performance is obtained.
- both ends of the smoothing capacitor 4 are connected to the input terminal “Vin” of the control circuit 20, and the input voltage is monitored by the control circuit 20. I have.
- the control of the voltage on the input side of the switching transformer 7 is performed by the control circuit 20 when the first switching element 5A and the second switching element 5A This is done by controlling the switching frequency of the switching element 5B, which improves safety as a power supply. It is.
- the resonance coil 6L is connected in series to the first resonance capacitor 6A, and is connected in parallel with the primary winding 7A of the switching transformer 7.
- the resonant switching power supply of Example 1 has a high output voltage and a large current, that is, a case where the load power to be supplied is large and a case where the output voltage is low and the current is small. That is, when the load power to be supplied is small, it has a resonance frequency characteristic having a plurality of different peaks.
- the resonance-type switching power supply of the first embodiment can provide a resonance-type switching power supply that can supply stable output power to the load.
- FIG. 3 is a circuit diagram showing another configuration of the resonance type switching power supply of the present invention. As shown in FIG. 3, this resonance type switching power supply device has the same configuration as the resonance type switching power supply device shown in FIG. 1, except that the second resonance capacitor 6B is eliminated, and the secondary side of the switching transformer 7 is newly added.
- the commercial power supply by connecting an active filter circuit in addition to the commercial power supply 1, the noise filter 2, and the AC rectification unit 3, the commercial power supply has a multi-type resonance power supply. Since a power supply is possible and the input voltage is stable, the output voltage is more stable.
- the resonance type switching power supply device is capable of varying the output voltage in a wide range, has a stable supply of the output voltage to the load, and has an excellent effect as a general-purpose and small-sized variable stabilized power supply. Having. Industrial applicability
- the resonance type switching power supply device is useful because the output voltage can be varied over a wide range and the output voltage is stably supplied to the load.
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
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US11/579,128 US7446512B2 (en) | 2004-05-07 | 2005-04-20 | Resonant switching power supply device |
JP2006512941A JP4762134B2 (ja) | 2004-05-07 | 2005-04-20 | 共振型スイッチング電源装置 |
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JP2004138228 | 2004-05-07 | ||
JP2004-138228 | 2004-05-07 |
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US (1) | US7446512B2 (ja) |
JP (1) | JP4762134B2 (ja) |
CN (1) | CN100472926C (ja) |
WO (1) | WO2005109618A1 (ja) |
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Also Published As
Publication number | Publication date |
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US20080024094A1 (en) | 2008-01-31 |
JP4762134B2 (ja) | 2011-08-31 |
CN1950997A (zh) | 2007-04-18 |
CN100472926C (zh) | 2009-03-25 |
JPWO2005109618A1 (ja) | 2008-03-21 |
US7446512B2 (en) | 2008-11-04 |
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