CN102694471B - Auxiliary power supply system for photovoltaic inverter - Google Patents
Auxiliary power supply system for photovoltaic inverter Download PDFInfo
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- CN102694471B CN102694471B CN201210166951.7A CN201210166951A CN102694471B CN 102694471 B CN102694471 B CN 102694471B CN 201210166951 A CN201210166951 A CN 201210166951A CN 102694471 B CN102694471 B CN 102694471B
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- 238000001514 detection method Methods 0.000 claims abstract description 9
- 238000006243 chemical reaction Methods 0.000 claims abstract description 6
- 239000003990 capacitor Substances 0.000 claims description 14
- 238000000034 method Methods 0.000 claims description 4
- 230000000087 stabilizing effect Effects 0.000 description 28
- 230000001681 protective effect Effects 0.000 description 7
- 230000000694 effects Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000005286 illumination Methods 0.000 description 1
- 238000013083 solar photovoltaic technology Methods 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
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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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
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- Dc-Dc Converters (AREA)
Abstract
本发明提供了一种光伏逆变器辅助电源系统，其特征在于：包括启动电路单元，启动电路单元的输入端与与逆变器DC直流母线电压相连，逆变器DC直流母线电压还连接电源转换电路，启动电路单元的输出端连接限流延时触发电路单元，电源控制单元的使能端连接控制单元，控制单元根据后端检测保护电路单元产生的第二电压控制信号使能电源控制单元，电源控制单元与自举电路单元相连，当电源控制单元能够产生稳定的直流电压后，自举电路单元在后端检测保护电路单元产生的第一电压控制信号的控制下工作。本发明的优点是：采用双闭环反馈控制系统，保证辅助电源的输出电压稳定；采用控制信号与控制器复位电路逻辑组合，保证了控制的稳定运行。
The invention provides a photovoltaic inverter auxiliary power supply system, which is characterized in that it includes a starting circuit unit, the input end of the starting circuit unit is connected to the DC bus voltage of the inverter, and the DC bus voltage of the inverter is also connected to the power supply In the conversion circuit, the output end of the starting circuit unit is connected to the current-limiting delay trigger circuit unit, the enable end of the power control unit is connected to the control unit, and the control unit enables the power control unit according to the second voltage control signal generated by the back-end detection and protection circuit unit , the power control unit is connected with the bootstrap circuit unit, and when the power control unit can generate a stable DC voltage, the bootstrap circuit unit works under the control of the first voltage control signal generated by the back-end detection and protection circuit unit. The invention has the advantages of: adopting a double closed-loop feedback control system to ensure the stability of the output voltage of the auxiliary power supply; adopting the logic combination of the control signal and the reset circuit of the controller to ensure the stable operation of the control.
Description
Technical field
The present invention relates to a kind of auxiliary power supply of photovoltaic inverter system, belong to solar photovoltaic technology field.
Background technology
The accessory power supply of photovoltaic DC-to-AC converter has been compared a great difference with conventional Switching Power Supply.Conventionally, the electricity consumption of regular tap power supply be the alternating current of electrical network after transformation, rectification, receive its input, so the voltage of Switching Power Supply is metastable.Yet in photovoltaic parallel in system, the direct current of solar panel output is directly received the input of accessory power supply, no longer passes through rectification link; Along with the variation of Intensity of the sunlight and ambient temperature, the voltage of photovoltaic array output there will be larger fluctuation in addition.Therefore the input terminal voltage of the accessory power supply of photovoltaic combining inverter is unsettled, and this just requires the operating voltage range of solar inverter secondary power system wider.But in actual application, tend to run into because of photovoltaic array output-power fluctuation, cannot constantly meet system power demand, cause repeatedly starting and stopping auxiliary power supply; Though or accessory power supply can start, do not reach the problem of the normal work of accessory power supply in the wide input voltage range needing.
Summary of the invention
The object of this invention is to provide a kind of cut-in voltage value can set, and can avoid repeatedly starting and stopping, the solar photovoltaic inverter secondary power system that power consumption is little and efficiency is high.
In order to achieve the above object, technical scheme of the present invention has been to provide a kind of auxiliary power supply of photovoltaic inverter system, it is characterized in that: comprise start-up circuit unit, the input of start-up circuit unit be connected with inverter DC DC bus-bar voltage, inverter DC DC bus-bar voltage also connects power-switching circuit, power-switching circuit comprises flyback transformer and power control unit, the output of start-up circuit unit connects current limliting delay trigger circuit unit, in start-up course, thereby open threshold voltage flyback transformer is worked for power control unit provides by current limliting delay trigger circuit unit, the Enable Pin connection control unit of power control unit, the second voltage control signal that control unit detects the generation of protective circuit unit according to rear end enables power control unit, power control unit is connected with boostrap circuit unit, when power control unit can produce after galvanic current pressure, under the control of the first voltage control signal that boostrap circuit unit produces in detection protective circuit unit, rear end, work, by boostrap circuit unit controls current limliting delay trigger circuit unit, provide operating voltage V for power control unit
cc,, by boostrap circuit unit, start-up circuit unit is closed meanwhile, thus the start-up course of completing.
Preferably, described start-up circuit unit comprises the first voltage stabilizing didoe, the negative electrode of the first voltage stabilizing didoe connects described inverter DC DC bus-bar voltage, the anode of the first voltage stabilizing didoe is connected with the drain electrode of the first resistance and MOSFET pipe respectively, the first resistance connect successively the second resistance and the 3rd resistance, the 3rd resistance is connected with the negative electrode of the 3rd voltage stabilizing didoe, the anode of anodic bonding second diode of the 3rd voltage stabilizing didoe, the negative electrode of the second diode connects described boostrap circuit unit, the source electrode of the one MOSFET pipe connects the 4th resistance, the 4th resistance is connected with described boostrap circuit unit, the grid of the one MOSFET pipe connects the collector electrode of the first triode, the base stage of the first triode is connected with the 5th resistance, the 5th resistance connects described boostrap circuit unit, the emitter-base bandgap grading of the first triode connects the negative electrode of the 4th voltage stabilizing didoe, the plus earth of the 4th voltage stabilizing didoe, base stage by the first triode provides starting resistor U by the 5th resistance
o, voltage stabilizing value and the starting resistor U of the first voltage stabilizing didoe and the 3rd voltage stabilizing didoe
osum is for opening the DC bus-bar voltage minimum value of start-up circuit unit, and, when inverter d-c bus voltage value is during higher than this minimum value, just start working in start-up circuit unit.
Preferably, described power-switching circuit comprises flyback transformer, one end of the primary coil of flyback transformer connects described DC bus-bar voltage, and the other end connects the drain electrode of the 2nd MOSFET pipe, by the voltage output end output output voltage V of the secondary coil of flyback transformer
outthe voltage output end of the secondary coil of flyback transformer also takes back the voltage stabilizing input of power control unit, the output of power control unit connects the grid of the 2nd MOSFET pipe, and the source electrode of the 2nd MOSFET pipe is respectively by the 18 grounding through resistance and connect described control unit.
Preferably, described control unit comprises the 5th triode, the base stage of the 5th triode connects described second voltage control signal by the tenth resistance, cross-over connection the 11 resistance between the emitter of the 5th triode and base stage, and the emitter of the 5th triode connects reference voltage V
ref, the collector electrode of the 5th triode connects respectively the Enable Pin of described power control unit and the source electrode of described the 2nd MOSFET pipe.
Preferably, described current limliting delay trigger circuit unit comprises current-limiting circuit and the first electric capacity, described start-up circuit unit is the first capacitor charging by current-limiting circuit, startup stage, by the first electric capacity after charging, provide the described threshold voltage of opening for described power control unit, after described boostrap circuit unit starting, the divider resistance being comprised by current limliting delay trigger circuit unit by described boostrap circuit unit provides operating voltage V for described power control unit
cc.
Preferably, described boostrap circuit unit comprises the 4th triode, the collector electrode of the 4th triode connects respectively the anode of the 6th diode and the 5th diode, the negative electrode of the 6th diode and the 5th diode connects respectively described start-up circuit unit and described current limliting delay trigger circuit unit, the emitter of the 4th triode connects described power-switching circuit, and the base stage of the 4th triode connects described the first voltage control signal by the 9th resistance.
Advantage of the present invention is: adopt two closed-loop feedback control systems, guarantee the output voltage stabilization of accessory power supply; Adopt control signal and controller reset circuit logical combination, guaranteed the stable operation of controlling, prevent from making control system instability generation order disorderly because power supply is unstable.Further advantages of the invention are: the start-up circuit 1, consisting of backward diode can be set secondary power system cut-in voltage value and starting power, thereby avoid accessory power supply to open in the situation that illumination is excessively weak, protection inverter; Start-up circuit is only operated in start-up course, and after power supply is stable, start-up circuit cuts out automatically; 2, secondary power system working range is wide, system free of losses, and power consumption is extremely low, is particularly suitable for photovoltaic inverting system and uses.
Accompanying drawing explanation
Fig. 1 is that photovoltaic DC-to-AC converter starts boostrap circuit figure;
Fig. 2 is auxiliary power supply of photovoltaic inverter conversion and control circuit figure.
Embodiment
For the present invention is become apparent, hereby with a preferred embodiment, and coordinate accompanying drawing to be described in detail below.
The present invention is directed to the requirement of auxiliary power supply of photovoltaic inverter, just can realize bootstrapping after designing a kind of startup, can avoid repeatedly starting and stopping, the solar photovoltaic inverter secondary power system that power consumption is little and efficiency is high.This system one end in photovoltaic inverting system is connected with inverter DC DC bus-bar voltage, and the other end is connected and the required supply power voltage of each of output inverter with detection protective circuit unit.In conjunction with Fig. 1, the present invention specifically comprises five circuit units, is respectively start-up circuit unit 1, current limliting delay trigger circuit unit 2, boostrap circuit unit 3, power-switching circuit unit 4 and control circuit unit 5.The input of start-up circuit unit 1 is connected with inverter DC DC bus-bar voltage, inverter DC DC bus-bar voltage also connects power-switching circuit 4, power-switching circuit 4 comprises flyback transformer T1 and power control unit, the output of start-up circuit unit 1 connects current limliting delay trigger circuit unit 2, in start-up course, thereby open threshold voltage flyback transformer T1 is worked for power control unit provides by current limliting delay trigger circuit unit 2, the Enable Pin CS connection control unit 5 of power control unit, the second voltage control signal K2 that control unit 5 detects the generation of protective circuit unit according to rear end enables power control unit, power control unit is connected with boostrap circuit unit 3, when power control unit can produce after galvanic current pressure, under the control of the first voltage control signal K1 that boostrap circuit unit 3 produces in detection protective circuit unit, rear end, work, by boostrap circuit unit 3, control current limliting delay trigger circuit unit 2 and provide operating voltage V for power control unit
cc,, by boostrap circuit unit 3, start-up circuit unit 1 is closed meanwhile, thus the start-up course of completing.
Secondary power system specific embodiment circuit is as illustrated in figs. 1 and 2.This circuit decapacitation detects busbar voltage in real time, can also successively open start-up circuit unit 1, current limliting delay trigger circuit unit 2, boostrap circuit unit 3, the power-switching circuit unit 4 of secondary power system in order according to the voltage threshold of setting, and can when busbar voltage drops, prevent the repeatedly starting and stopping of accessory power supply.Be described as follows:
Start-up circuit unit 1 comprises the first voltage stabilizing didoe D1, the negative electrode of the first voltage stabilizing didoe D1 connects described inverter DC DC bus-bar voltage, the anode of the first voltage stabilizing didoe D1 is connected with the drain electrode of the first resistance R 1 and MOSFET pipe M1 respectively, the first resistance R 1 connect successively the second resistance R 2 and the 3rd resistance R 3, the 3rd resistance R 3 is connected with the negative electrode of the 3rd voltage stabilizing didoe D3, the anode of anodic bonding the second diode D2 of the 3rd voltage stabilizing didoe D3, the negative electrode of the second diode D2 connects the negative electrode of the 6th diode D6 of boostrap circuit unit 3, the source electrode of the one MOSFET pipe M1 connects the 4th resistance R 4, the 4th resistance R 4 is connected with the negative electrode of the 6th diode D6 of boostrap circuit unit 3, the grid of the one MOSFET pipe M1 connects the collector electrode of the first triode Q1, the base stage of the first triode Q1 is connected with the 5th resistance R 5, the 5th resistance R 5 connects described boostrap circuit unit 3, the emitter-base bandgap grading of the first triode Q1 connects the negative electrode of the 4th voltage stabilizing didoe D4, the plus earth of the 4th voltage stabilizing didoe D4, base stage by the first triode Q1 provides starting resistor U by the 5th resistance R 5
o, starting resistor U
oby the 4th voltage stabilizing didoe D4, determined voltage stabilizing value and the starting resistor U of the first voltage stabilizing didoe D1 and the 3rd voltage stabilizing didoe D3
osum is for opening the DC bus-bar voltage minimum value of start-up circuit unit, and, when inverter d-c bus voltage value is during higher than this minimum value, just start working in start-up circuit unit.
Current limliting circuits for triggering unit 2 comprises the current-limiting circuit consisting of the second triode Q2, the 3rd triode Q3, the 6th resistance R 6 and the 7th resistance R 7.In start-up circuit unit, 1 generates the starting resistor U that is about voltage reference value
oprocess in, by the 6th resistance R 6 and take current-limiting circuit that the second triode Q2, the 3rd triode Q3 be that main element forms to the first capacitor C 1 charging, when the voltage of the first capacitor C 1 reaches opening after threshold voltage of power supply control chip in power control unit, by power supply control chip, trigger flyback transformer T1 and work.The effect of current-limiting circuit is to prevent that the electric current charging to the first capacitor C 1 is excessive, makes start-up circuit load overweight.
As shown in Figure 2, power-switching circuit 4 comprises flyback transformer T1, on the primary coil of flyback transformer T1, be connected with the 19 resistance R 19, the 6th capacitor C 6, the tenth voltage stabilizing didoe D10 and the 9th voltage stabilizing didoe D9, one end of its primary coil connects DC bus-bar voltage, and the other end connects the drain electrode of the 2nd MOSFET pipe M2.Voltage output end output output voltage V by the secondary coil of flyback transformer T1
out, on this secondary coil, be connected with the 7th diode D7, the 8th diode D8, the first fuse F1, the second fuse F2, the 4th capacitor C 4, the 5th capacitor C the 5, the 20 resistance R 20 and the 21 resistance R 21.The voltage output end of the secondary coil of flyback transformer T1 also takes back the voltage stabilizing input FB of power control unit.Wherein, power control unit adopts power supply control chip UCC2801D.The voltage output end of secondary coil passes through after the bleeder circuit dividing potential drop being comprised of the 12 resistance R 12 and the 13 resistance R 13, then by the 14 resistance R the 14, the 15 resistance R 15, the second capacitor C 2 and the 3rd capacitor C 3, connects the voltage stabilizing input FB of power supply control chip UCC2801D.The output OUT of power supply control chip UCC2801D connects the bleeder circuit being comprised of the 16 resistance R 16 and the 17 resistance R 17, and the grid of the 2nd MOSFET pipe M2 connects the 17 resistance R 17.The source electrode of the 2nd MOSFET pipe M2 is respectively by the 18 resistance R 18 ground connection and connection control unit 5.
Control unit 5 comprises the 5th triode Q5, the base stage of the 5th triode Q5 connects second voltage control signal K2 by the tenth resistance R 10, between the emitter of the 5th triode Q5 and base stage, the emitter of cross-over connection the 11 resistance R 11, the five triode Q5 connects reference voltage V
ref, the collector electrode of the 5th triode Q5 connects respectively the Enable Pin CS of power supply control chip UCC2801D and the source electrode of the 2nd MOSFET pipe M2.
Boostrap circuit unit 3 comprises the 4th triode Q4, the collector electrode of the 4th triode Q4 connects respectively the anode of the 6th diode D6 and the 5th diode D5, the negative electrode of the 6th diode D6 and the 5th diode D5 connects respectively described start-up circuit unit 1 and described current limliting delay trigger circuit unit 2, the base stage that the emitter of the 4th triode Q4 connects described power-switching circuit 4, the four triode Q4 connects the first voltage control signal K1 by the 9th resistance R 9.
The first voltage control signal K1 that secondary power system provided by the invention is produced by detection protective circuit unit, rear end is connected to boostrap circuit unit 3 and forms closed loop feedback; meanwhile, the second voltage control signal K2 signal being produced by this detection protective circuit unit is connected to power-switching circuit unit 4 and forms closed loop feedback.
In secondary power system control flow of the present invention, it should be noted that: 1. second voltage control signal K2 is unstable, make the first voltage control signal K1 also unstable, accessory power supply cannot normally be worked; 2. after second voltage control signal K2 stablizes, accessory power supply can be opened, and power supply is booted in voltage setting range, and accessory power supply chip is normally worked.
When inverter DC DC bus-bar voltage is greater than the DC bus-bar voltage minimum value of opening start-up circuit unit, start-up circuit unit 1 starts and exports starting resistor U
o, meanwhile, by second voltage control signal K2, will be placed in high level and enable power supply control chip UCC2801D, otherwise second voltage control signal K2 remains at low level.By starting resistor U
obe the first capacitor C 1 charging, after the first capacitor C 1 is full of, the working power port Vcc by power supply control chip UCC2801D opens threshold voltage for it provides, and power supply control chip UCC2801D starts working.By power supply control chip UCC2801D, control flyback transformer T1 and produce direct voltage, this direct voltage feeds back to the voltage stabilizing input FB of power supply control chip UCC2801D, by power supply control chip UCC2801D by after its voltage stabilizing, stable output direct voltage.Judge that whether this stable DC voltage is stable, if stable, thereby the first voltage control signal K1 is placed in to high level, open boostrap circuit unit 3, the first voltage control signal K1 is always in low level state before this.Boostrap circuit unit 3 adds to this stable DC voltage on the anode of the 5th diode D5 and the 6th diode D6, by the 5th diode D5, by the 8th resistance R 8, provides operating voltage V for power supply control chip UCC2801D
cc, make power supply control chip UCC2801D can pass through output OUT output pwm signal, thereby the voltage that makes flyback transformer T1 form different potentials is powered to solar inverter each several part.The 6th diode D6 forces the collector potential of the first triode Q1 to draw simultaneously, make the first triode Q1 saturation conduction, then make the grid potential of a MOSFET pipe M1 be pulled down to about voltage reference value, the one MOSFET pipe M1 cut-off, thereby start-up circuit unit 1 is closed, auxiliary power start process finishes.
Claims (1)
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210166951.7A CN102694471B (en) | 2012-05-24 | 2012-05-24 | Auxiliary power supply system for photovoltaic inverter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210166951.7A CN102694471B (en) | 2012-05-24 | 2012-05-24 | Auxiliary power supply system for photovoltaic inverter |
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| Publication Number | Publication Date |
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| CN102694471A CN102694471A (en) | 2012-09-26 |
| CN102694471B true CN102694471B (en) | 2014-10-15 |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104124698B (en) * | 2013-04-25 | 2020-02-21 | 惠州天能源科技有限公司 | Delay starting device for solving problem of frequent start of photovoltaic grid-connected inverter in morning and evening |
| CN103956889A (en) * | 2014-04-30 | 2014-07-30 | 瑞斯康达科技发展股份有限公司 | Enable signal control circuit and power circuit |
| CN112564472B (en) * | 2020-11-30 | 2021-11-26 | 江苏科技大学 | Direct-current high-power supply soft start circuit and method |
| CN112566313B (en) * | 2020-12-07 | 2023-06-16 | 公牛集团股份有限公司 | Delay starting circuit and lamp |
| CN117792064B (en) * | 2024-02-28 | 2024-05-07 | 美世乐(广东)新能源科技有限公司 | A photovoltaic inverter auxiliary power supply system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US5479333A (en) * | 1994-04-25 | 1995-12-26 | Chrysler Corporation | Power supply start up booster circuit |
| CN101807850A (en) * | 2010-04-23 | 2010-08-18 | 合肥日源电气信息技术有限公司 | Circuit capable of avoiding repeatedly starting and stopping auxiliary power supply of photovoltaic inverter |
| CN102315764A (en) * | 2011-09-16 | 2012-01-11 | 深圳创动科技有限公司 | Control method for auxiliary power supply of photovoltaic inverter and device |
| CN102361402A (en) * | 2011-10-21 | 2012-02-22 | 广州金升阳科技有限公司 | Switching power supply circuit |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4373995B2 (en) * | 2005-06-24 | 2009-11-25 | フリボ モバイル パワー ゲーエムベーハー | Control circuit for controlling current and voltage in switch mode power supplies |
-
2012
- 2012-05-24 CN CN201210166951.7A patent/CN102694471B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5479333A (en) * | 1994-04-25 | 1995-12-26 | Chrysler Corporation | Power supply start up booster circuit |
| CN101807850A (en) * | 2010-04-23 | 2010-08-18 | 合肥日源电气信息技术有限公司 | Circuit capable of avoiding repeatedly starting and stopping auxiliary power supply of photovoltaic inverter |
| CN102315764A (en) * | 2011-09-16 | 2012-01-11 | 深圳创动科技有限公司 | Control method for auxiliary power supply of photovoltaic inverter and device |
| CN102361402A (en) * | 2011-10-21 | 2012-02-22 | 广州金升阳科技有限公司 | Switching power supply circuit |
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