CN102801342A - Rectification circuit capable of approximating AC side current to sine wave and control method - Google Patents
Rectification circuit capable of approximating AC side current to sine wave and control method Download PDFInfo
- Publication number
- CN102801342A CN102801342A CN2012102811505A CN201210281150A CN102801342A CN 102801342 A CN102801342 A CN 102801342A CN 2012102811505 A CN2012102811505 A CN 2012102811505A CN 201210281150 A CN201210281150 A CN 201210281150A CN 102801342 A CN102801342 A CN 102801342A
- Authority
- CN
- China
- Prior art keywords
- circuit
- current
- filtering
- chopper
- equivalent
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Landscapes
- Rectifiers (AREA)
Abstract
The invention relates to a rectification circuit capable of approximating alternating current (AC) side current to sine wave and a control method. The AC side current of the rectification circuit can be approximated to the sine wave. The rectification circuit consists of a single-phase AC power supply, an AC filter circuit, a single-phase diode rectifier, a direct current (DC) filter circuit, a DC chopper circuit and a DC current supply, wherein the DC filter circuit, the DC chopper circuit and the DC current supply are equivalent to a resistor by controlling the duty cycle of the DC chopper circuit. Due to the adoption of the rectification circuit and the control method provided by the invention, the distortion rate of the AC side current of the rectification circuit can be very small, and the power factor is approximate to 1.
Description
Technical field
The present invention relates to a kind of electric power conversion method, in particular, relate to a kind of the interchange and survey rectification circuit and the control method that electric current is approximately sine wave.
Background technology
Along with the development of modern power electronics technology, greatly electric energy all will could satisfy the requirement of power consumption equipment through conversion once even repeatedly, wherein diode control rectifying circuit not; The AC rectification of civil power is become direct current, and use big capacitor filtering, to obtain the less direct current of fluctuation at DC side; And in exchanging survey, producing bigger harmonic wave, these harmonic waves that produced can pollute civil power, and the quality of power supply is descended; Loss increases, and the power consumption equipment loss increases, even damages; Therefore be necessary diode rectifier circuit is transformed, to reduce the harmonic pollution of rectification circuit to electrical network.
Wind power generation has randomness and fluctuation; And the amplitude of the voltage that sends of wind-driven generator and frequency are also changing; Therefore, can not directly insert electrical network, generally all need the transformation of electrical energy of these amplitudes and frequency change be become to be fit to insert the electric energy of electrical network with power electronic equipment; Method commonly used now is an ac-dc-ac inverter; Wherein the current transformer of blower fan side generally adopts two level or three-level current transformer, and as switching device, this type current transformer produces very big high frequency voltage harmonic wave with IGBT; Needing increases corresponding filter, and bigger influence can be arranged the insulation of blower fan; In addition, very high switching frequency just can produce bigger loss, also can increase the cost of heat radiation; A large amount of use turn-off devices also causes converter structure complicated, and cost significantly raises, and it is very complicated that control also becomes, and therefore also reduced reliability.Therefore, the harmonic content of developing a kind of ac-side current and voltage is little, and is simple in structure, and control is simple, and cost is low, and the current transformer that reliability is high just becomes key of problem.
Needing the occasion of power rectifier,, can produce very big economic worth if can reduce harmonic current and reactive power.
Summary of the invention
The present invention proposes a kind of ac-side current and be approximately sinusoidal wave rectification circuit and control method, can solve the deficiency that prior art exists.Rectification circuit proposed by the invention and control method can make the aberration rate of ac-side current very little, and power factor is very high, therefore just filter and reactive-load compensation equipment can be installed, and therefore, have reduced the cost of whole system.
The present invention adopts following scheme to realize the object of the invention:
A kind of ac-side current is approximately sinusoidal wave rectification circuit and control method, it is characterized in that:
Described rectification circuit comprises: single phase alternating current power supply (U), ac filter circuit (L), single-phase diode rectifier bridge, and DC filtering circuit (C), DC chopper circuit, Equivalent DC current source (Is) constitutes;
Described ac filter circuit (L) is constituted by one of them or its of electric components such as electric capacity, inductance, resistance; Be connected between described single phase alternating current power supply (U) and the described single-phase diode rectifier bridge, its purpose is the harmonic component in filtering alternating voltage and the alternating current; The port voltage of described ac filter circuit (L) can suddenly change, and the electric current that flows through described ac filter circuit (L) can not suddenly change;
Described single-phase diode rectifier bridge is made up of four diodes, is connected between described ac filter circuit (L) and the described DC filtering circuit (C), and its purpose is that with ac voltage rectifier be direct voltage;
Described DC filtering circuit (C) has one of them or its of electric components such as electric capacity, inductance, resistance to constitute; Be connected between described single-phase diode rectifier bridge and the described DC chopper circuit, its purpose is the harmonic component in filtering direct voltage and the direct current; The electric current that flows through described DC filtering circuit (C) can suddenly change, and the voltage of described DC filtering circuit (C) port can not suddenly change;
Described DC chopper circuit is by power electronic device; And circuit element such as electric capacity, inductance, resistance or its constitute; Be connected between described DC filtering circuit (C) and the equivalent current source (Is); Its purpose is through controlling the duty ratio of described DC chopper circuit, and then controls the size of described rectification circuit power output, and makes the electric current in the described single phase alternating current power supply be approximately sinusoidal wave;
Described Equivalent DC current source is the equivalent electric circuit of external circuit, is connected after the described DC chopper circuit, contains the inductor filter circuit, to reduce the fluctuation of electric current;
Described control method is: through the duty ratio of control DC chopper circuit, the circuit equivalent that DC filtering circuit, DC chopper circuit and direct current are constituted is a resistance.The formula of the duty ratio of described DC chopper circuit is: and D=Vdc/ (Idc * Req); Wherein D is the duty ratio of described DC chopper circuit, and Vdc is described single-phase diode rectifier bridge dc voltage instantaneous value, and Idc is the size of electric current in the described DC current source, and Req is described equivalent resistance; Through the size of control Req, just can control the watt level of rectification circuit output;
Can constitute rectified three-phase circuit by three single phase rectifier circuits, wherein the phase place of the single phase alternating current power supply in three single phase rectifier circuits differs from 120 degree each other; Isolate each other between the single phase alternating current power supply in three described single phase rectifier circuits, the DC chopper circuit in described three rectification circuits is together in series with same Equivalent DC current source.
Description of drawings
Fig. 1 is the main circuit structure figure that ac-side current is approximately the rectification circuit of sine wave.
Fig. 2 is the main circuit structure figure of rectification circuit when adopting multipleization DC chopper circuit.
Fig. 3 is the simulation waveform figure of ac-side current.
Embodiment
A kind of ac-side current proposed by the invention is approximately sinusoidal wave rectification circuit and control method, combines the explanation of accompanying drawing and embodiment as follows at present:
Described rectification circuit comprises: single phase alternating current power supply (U), ac filter circuit (L), single-phase diode rectifier bridge, and DC filtering circuit (C), DC chopper circuit, Equivalent DC current source (Is) constitutes;
Wherein single phase alternating current power supply employing effective value is the AC power of 1.2kV; Ac filter circuit adopts the inductance of a 2mH; The single-phase diode rectification circuit is made up of four diodes, and dc filter capacitor adopts the electric capacity of a 50uF, and the instantaneous value of this capacitance voltage is Vdc; DC chopper circuit adopts multipleization DC chopper circuit, is formed in parallel by three DC chopper circuits, and each chopper circuit contains an inductance (L1, L2, L3); In order to the restriction change in current; Electric current in three inductance is respectively I1, I2, I3, and in addition, each chopper circuit also contains an IGBT (T1, T2, T3) and a diode; The current value of DC current source is 1.5kA, and is as shown in Figure 2.
The switching frequency of IGBT is 2kHz, the phase phasic difference of the switching signal of two IGBT 120 degree, wherein Di=Vdc/ (Ii * Req), i=1 wherein, 2,3; Di is the duty ratio of i IGBT, and Req is an equivalent resistance.
According to the rectification circuit of being mentioned in this embodiment, built corresponding artificial circuit, before 1.2 seconds; Equivalent resistance Req is 8 Ω, and at 1.2 seconds constantly, equivalent resistance sports 1 Ω; Wherein ac-side current is as shown in Figure 3, and as can be seen from Figure 3, the current distortion of AC side is very little.
Rectification circuit by mentioned in three embodiments can constitute rectified three-phase circuit, and by the power supply of three-phase transformer, the second siding ring of three-phase transformer is isolated each other, and three second siding rings are respectively as the AC power of three single phase rectifier circuits; In addition, with same Equivalent DC current source three DC chopper circuits are together in series, so, the fluctuation meeting of the direct voltage of output is littler.
Above execution mode only is used to explain the present invention; And be not limitation of the present invention; The those of ordinary skill in relevant technologies field under the situation that does not break away from the spirit and scope of the present invention, can also be made various variations and modification; Therefore all technical schemes that are equal to also belong to category of the present invention, and scope of patent protection of the present invention should be defined by the claims.
Claims (2)
1. an ac-side current is approximately sinusoidal wave rectification circuit and control method, it is characterized in that:
Described rectification circuit comprises: single phase alternating current power supply (U), ac filter circuit (L), single-phase diode rectifier bridge, and DC filtering circuit (C), DC chopper circuit, Equivalent DC current source (Is) constitutes;
Described ac filter circuit (L) is constituted by one of them or its of electric components such as electric capacity, inductance, resistance; Be connected between described single phase alternating current power supply (U) and the described single-phase diode rectifier bridge, its purpose is the harmonic component in filtering alternating voltage and the alternating current; The port voltage of described ac filter circuit (L) can suddenly change, and the electric current that flows through described ac filter circuit (L) can not suddenly change;
Described single-phase diode rectifier bridge is made up of four diodes, is connected between described ac filter circuit (L) and the described DC filtering circuit (C), and its purpose is that with ac voltage rectifier be direct voltage;
Described DC filtering circuit (C) has one of them or its of electric components such as electric capacity, inductance, resistance to constitute; Be connected between described single-phase diode rectifier bridge and the described DC chopper circuit, its purpose is the harmonic component in filtering direct voltage and the direct current; The electric current that flows through described DC filtering circuit (C) can suddenly change, and the voltage of described DC filtering circuit (C) port can not suddenly change;
Described DC chopper circuit is by power electronic device; And circuit element such as electric capacity, inductance, resistance or its constitute; Be connected between described DC filtering circuit (C) and the equivalent current source (Is); Its purpose is through controlling the duty ratio of described DC chopper circuit, and then controls the size of described rectification circuit power output, and makes the electric current in the described single phase alternating current power supply be approximately sinusoidal wave;
Described Equivalent DC current source is the equivalent electric circuit of external circuit, is connected after the described DC chopper circuit, contains the inductor filter circuit, to reduce the fluctuation of electric current;
Described control method is: through the duty ratio of control DC chopper circuit, the circuit equivalent that DC filtering circuit, DC chopper circuit and direct current are constituted is a resistance;
The formula of the duty ratio of described DC chopper circuit is: and D=Vdc/ (Idc * Req); Wherein D is the duty ratio of described DC chopper circuit, and Vdc is described single-phase diode rectifier bridge dc voltage instantaneous value, and Idc is the size of electric current in the described DC current source, and Req is described equivalent resistance; Through the size of control Req, just can control the watt level of rectification circuit output.
2. a kind of ac-side current described in claim 1 is approximately sinusoidal wave rectification circuit and control method; It is characterized in that: the single phase rectifier circuit by described in three claims 1 can constitute rectified three-phase circuit, and the phase place of the single phase alternating current power supply in three described single phase rectifier circuits differs from 120 degree each other; Isolate each other between the single phase alternating current power supply in three described single phase rectifier circuits, the DC chopper circuit in described three rectification circuits is together in series with same Equivalent DC current source.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012102811505A CN102801342A (en) | 2012-08-09 | 2012-08-09 | Rectification circuit capable of approximating AC side current to sine wave and control method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012102811505A CN102801342A (en) | 2012-08-09 | 2012-08-09 | Rectification circuit capable of approximating AC side current to sine wave and control method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102801342A true CN102801342A (en) | 2012-11-28 |
Family
ID=47200335
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012102811505A Pending CN102801342A (en) | 2012-08-09 | 2012-08-09 | Rectification circuit capable of approximating AC side current to sine wave and control method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102801342A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108134440A (en) * | 2017-12-28 | 2018-06-08 | 广州市风力新能源科技有限公司 | A kind of high power wind-mill generating equipment |
| CN109889074A (en) * | 2019-04-11 | 2019-06-14 | 美的集团武汉制冷设备有限公司 | Drive control circuit and household appliance |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5471117A (en) * | 1994-05-11 | 1995-11-28 | Mti International, Inc. | Low power unity power factor ballast |
| CN1988354A (en) * | 2006-12-07 | 2007-06-27 | 上海交通大学 | Cascade multiple zero matrix rectifier |
| US20080018261A1 (en) * | 2006-05-01 | 2008-01-24 | Kastner Mark A | LED power supply with options for dimming |
| CN102044958A (en) * | 2009-10-23 | 2011-05-04 | 台达电子工业股份有限公司 | Voltage reducing and boosting PFC (Power Factor Correction) circuit system with auxiliary circuit and method thereof |
-
2012
- 2012-08-09 CN CN2012102811505A patent/CN102801342A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5471117A (en) * | 1994-05-11 | 1995-11-28 | Mti International, Inc. | Low power unity power factor ballast |
| US20080018261A1 (en) * | 2006-05-01 | 2008-01-24 | Kastner Mark A | LED power supply with options for dimming |
| CN1988354A (en) * | 2006-12-07 | 2007-06-27 | 上海交通大学 | Cascade multiple zero matrix rectifier |
| CN102044958A (en) * | 2009-10-23 | 2011-05-04 | 台达电子工业股份有限公司 | Voltage reducing and boosting PFC (Power Factor Correction) circuit system with auxiliary circuit and method thereof |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108134440A (en) * | 2017-12-28 | 2018-06-08 | 广州市风力新能源科技有限公司 | A kind of high power wind-mill generating equipment |
| CN109889074A (en) * | 2019-04-11 | 2019-06-14 | 美的集团武汉制冷设备有限公司 | Drive control circuit and household appliance |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Koutroulis et al. | A bidirectional, sinusoidal, high-frequency inverter design | |
| Fardoun et al. | Bridgeless high-power-factor buck-converter operating in discontinuous capacitor voltage mode | |
| AU2010353929B2 (en) | Converting device of electrical energy | |
| Nayanasiri et al. | Half-wave cycloconverter-based photovoltaic microinverter topology with phase-shift power modulation | |
| US20120281441A1 (en) | Circuit for converting a direct current voltage to an alternating current voltage | |
| TW201338378A (en) | Wind power generation system, and power circuit and converter structure thereof | |
| US20150028886A1 (en) | Circuit Arrangement For Generating a Test Voltage, in Particular For Testing The Insulation of Installed Cable | |
| CN103580498B (en) | High-power energy can the control method of feedback type grid stimulating device and employing thereof | |
| CN101692112A (en) | High-power electric energy quality signal generator for testing 400Hz electric equipment | |
| Facchinello et al. | Closed-loop operation and control strategy for the dual active half bridge ac-ac converter | |
| Filsecker et al. | Design and losses of PWM current source converters | |
| CN102801342A (en) | Rectification circuit capable of approximating AC side current to sine wave and control method | |
| Toumi et al. | Three-phase PFC rectifier using a switching current injection device for vehicle power train application | |
| CN109617423A (en) | High-power extremely low frequency power and its subharmonic inhibit device | |
| Jibhakate et al. | Power factor improvement using nine switch AC-DC-AC converter | |
| Saxena et al. | Simulation of Multipulse Converter for Harmonic Reduction using Controlled Rectifier | |
| Guo et al. | Research on topology and control of household energy routers based on direct AC/AC power electronic transformer | |
| Cardoso et al. | SiC based cascaded multilevel converter for solar applications: Downscaled prototype development | |
| Makoschitz et al. | Topology survey of DC-side-enhanced passive rectifier circuits for low-harmonic input currents and improved power factor | |
| Ertasgin et al. | Analysis and design of single-phase current-source grid-connected PV inverter | |
| Minami et al. | Analysis of Class DE current driven low $ di/dt $ rectifier | |
| CN203691250U (en) | Small-size high-voltage isolation transformer | |
| CN204517511U (en) | A kind of mains by harmonics energy utilization device | |
| KR100713691B1 (en) | Voltage control device for voltage drop | |
| Soeiro et al. | Bidirectional three-phase PFC concept based on an integrated inverting-link current source converter |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| WD01 | Invention patent application deemed withdrawn after publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20121128 |