CN101807850A - Circuit capable of avoiding repeatedly starting and stopping auxiliary power supply of photovoltaic inverter - Google Patents
Circuit capable of avoiding repeatedly starting and stopping auxiliary power supply of photovoltaic inverter Download PDFInfo
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- CN101807850A CN101807850A CN 201010154709 CN201010154709A CN101807850A CN 101807850 A CN101807850 A CN 101807850A CN 201010154709 CN201010154709 CN 201010154709 CN 201010154709 A CN201010154709 A CN 201010154709A CN 101807850 A CN101807850 A CN 101807850A
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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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Abstract
The invention relates to a circuit capable of avoiding repeatedly starting and stopping an auxiliary power supply of a photovoltaic inverter. The circuit is a damp load switching circuit, which is connected between an input bus capacitor and the auxiliary power supply of the photovoltaic inverter; and a solar cell panel supplies power to the auxiliary power supply through the input bus capacitor. In the invention, the damp load switching circuit is arranged on the auxiliary power supply of the photovoltaic inverter, so when the auxiliary power supply is switched off or does not work, the damp load switching circuit is mounted on the direct current bus of the photovoltaic inverter to inhibit the overhigh open-circuit voltage of the solar cell panel when light is weak for preventing the start-up of the auxiliary power supply from being initiated, or when the output capacity of the solar cell panel is as high as to start the auxiliary power supply, the damp load switching circuit is removed, and the whole auxiliary power supply system works normally.
Description
Technical field
The present invention relates to a kind of inverter, especially a kind of circuit of avoiding repeatedly starting and stopping auxiliary power supply of photovoltaic inverter.
Background technology
The way to take power that the accessory power supply of photovoltaic DC-to-AC converter is commonly used is divided into from the electrical network power taking, from electrical network and the mutual top power taking of photovoltaic DC-to-AC converter dc bus, from three kinds of photovoltaic DC-to-AC converter dc bus power takings.Wherein, by preceding two kinds of way to take power power takings the time, photovoltaic DC-to-AC converter has idling consumption at night, and needs rectifier bridge and bigger input capacitance.And during from the power taking of photovoltaic DC-to-AC converter dc bus, under low light level situations such as The sun came up, sunset and wet weather, the low operate as normal that can't satisfy accessory power supply of the carrying load ability of solar panel, accessory power supply can start and shut down repeatedly.This is by the decision of the output characteristic of solar panel, the open circuit output voltage of solar panel is very high when the low light level, but load capacity is low, behind the auxiliary power start, solar battery panel can't be born the loss of whole accessory power supply, causes accessory power supply to quit work, and this moment, solar panel was equivalent to open circuit, its open circuit voltage is very high can to make whole accessory power supply start once more, so causes the repeatedly starting and stopping of accessory power supply when the low light level repeatedly.
Summary of the invention
The object of the present invention is to provide a kind ofly when the low light level, can avoid the circuit of the repeatedly starting and stopping auxiliary power supply of photovoltaic inverter avoided of repeatedly starting and stopping auxiliary power supply of photovoltaic inverter.
For achieving the above object, the present invention has adopted following technical scheme: a kind of circuit of avoiding repeatedly starting and stopping auxiliary power supply of photovoltaic inverter, this circuit is an off-load load switching circuit, off-load load switching circuit is connected between the accessory power supply of inlet highway electric capacity and photovoltaic DC-to-AC converter, and solar panel is powered to accessory power supply by inlet highway electric capacity.
The present invention is by adding loading and unloading load switching circuit on the accessory power supply of photovoltaic DC-to-AC converter, in the accessory power supply shutdown, when not working, off-load load switching circuit carry is on the dc bus of photovoltaic DC-to-AC converter, to suppress solar panel too high open circuit voltage when the low light level, avoided the open circuit voltage of too high solar panel to cause the accessory power supply start; Otherwise when the fan-out capability of solar panel enough made auxiliary power start, off-load load switching circuit was removed, whole secondary power system operate as normal.The present invention is by to the simple modifications of prior art, well solved the problem of restarting repeatedly when the low light level from the accessory power supply of photovoltaic DC-to-AC converter dc bus power taking.The present invention does not have the idling consumption at night, has saved electric energy, need not rectifier bridge and bigger input capacitance, has saved cost.
Description of drawings
Fig. 1 is the circuit block diagram of the present invention and peripheral circuit;
Fig. 2,3 is the circuit diagram of the present invention and accessory power supply.
Embodiment
As shown in Figure 1, a kind of circuit of avoiding repeatedly starting and stopping auxiliary power supply of photovoltaic inverter, this circuit is an off-load load switching circuit 6, off-load load switching circuit 6 is connected between the accessory power supply 8 of inlet highway electric capacity 2 and photovoltaic DC-to-AC converter, use the BOOST circuit to do prime at photovoltaic DC-to-AC converter, carry out under the situation of MPPT adjusting, the inlet highway electric capacity 2 here is the output capacitance of BOOST circuit.Solar panel 1 is powered to accessory power supply 8 by inlet highway electric capacity 2.
As shown in Figure 1, described accessory power supply 8 comprises Power Conversion unit 3, described inlet highway electric capacity 2 links to each other with input, the off-load load switching circuit 6 of Power Conversion unit 3 respectively, the output of Power Conversion unit 3 links to each other with output filter unit 4, output filter unit 4 links to each other with the signal input part of switch control unit 5 by feedback circuit 7, and the signal output part of described switch control unit 5 links to each other with Power Conversion unit 3, off-load load switching circuit 6 respectively.Accessory power supply 8 is for conversion into low voltage and direct current with high voltage direct current and gives output filter unit 4, switch control unit 5 has determined frequency of oscillation and duty ratio, feedback circuit 7 is used for regulated output voltage, and off-load load switching circuit 6 guarantees to avoid accessory power supply 8 phenomenon that starts repeatedly to occur at the low light level, when the solar panel load capacity is not enough.
As shown in Figure 2, described off-load load switching circuit 6 is by switching tube Q2, switching tube Q3, resistance R 1, diode D1 forms, wherein, described switching tube Q2, switching tube Q3 is a metal-oxide-semiconductor, during triode and IGBT manage three kinds any one, described resistance R 1 is as the off-load load resistance, the dc bus of one termination photovoltaic DC-to-AC converter of resistance R 1, the other end of resistance R 1 links to each other with the drain electrode of switching tube Q2, the grid of switching tube Q2 respectively with the drain electrode of switching tube Q3, the positive pole of diode D1 links to each other, the grid of switching tube Q3 links to each other with the positive pole of diode D3, switching tube Q2, the source electrode of switching tube Q3 connects the former border district of accessory power supply 8 respectively, play the dc bus of the termination photovoltaic DC-to-AC converter of dynamo-electric resistance R2, the other end that plays dynamo-electric resistance R2 links to each other with the positive pole of diode D1, described switch control unit 5 comprises chip UC384X, and the negative pole of diode D1 links to each other with the 7th pin of chip UC384X.Described Power Conversion unit 3 comprises transformer TX1 and switching tube Q1, the grid of described switching tube Q1 links to each other with the output pin of chip UC384X by resistance R 4, described output filter unit 4 adopts the LC filter circuit, the former edge joint of transformer TX1 is between inlet highway electric capacity 2 and chip UC384X, and the secondary of transformer TX1 connects the LC filter circuit.Described feedback circuit is made of resistance R 8, resistance R 9, resistance R 10, capacitor C 4, capacitor C 5, comes the supply power voltage of regulated output voltage and chip UC384X.
As shown in Figure 2, the resistance that plays dynamo-electric resistance R2 has determined the minimum starting resistor of accessory power supply 8, when the busbar voltage of inverter during greater than the minimum starting resistor of accessory power supply 8, accessory power supply 8 is started working, the minimum starting resistor of setting accessory power supply 8 is 200V, can select the resistance of resistance R 2 according to the minimum starting current of chip UC384X.The resistance of resistance R 1 is by the maximal input decision of the minimum starting resistor and the whole accessory power supply 8 of switch control unit 5.The maximal input of supposing whole accessory power supply 8 is 15W, the power that resistance R 1 consumes under the minimum starting resistor of accessory power supply 8 will be complementary with the maximal input of accessory power supply 8, in the present invention, suppose that the power that resistance R 1 consumes under minimum starting resistor at accessory power supply 8 is 20W, the resistance that can calculate resistance R 1 is 2K ohm.The maximum voltage that switching tube Q1 bears is the maximum output voltage of solar panel 1, and this maximum output voltage is 600V in the present invention, considers surplus, and switching tube Q1 selects the switching tube of 800V for use.
As shown in Figure 2, when the output voltage of solar panel 1 relatively hangs down, flow through the minimum starting current of the electric current of dynamo-electric resistance R2 less than chip UC384X, the voltage on the 7th pin of chip UC384X can't reach the minimum threshold voltage that starts, and accessory power supply 8 is not worked.When busbar voltage increases gradually, the minimum starting current of chip UC384X increases gradually, voltage on 7 pin of chip UC384X raises gradually, the starter gate valve threshold voltage of chip UC384X is between 15～17V or between 7.8V～9V, and switching tube Q2 open threshold voltage generally at 2.5～5V, so just conducting of switching tube Q2 before chip UC384X does not work, resistance R 1 has been articulated on the dc bus of inverter.
As shown in Figure 2, when solar panel 1 along with strengthen sunshine, during the carrying load ability grow, the output voltage of solar panel 1 raises gradually, the power that consumes on the resistance R 1 strengthens gradually, the starting current that flows through resistance R 2 simultaneously increases gradually, and the minimum starting current on flowing through resistance R 2 is during greater than the minimum starting current of chip UC384X, and chip UC384X starts, accessory power supply 8 is started working, and at this moment transformer TX1 powers to chip UC384X by diode D2 and diode D3.The supply power voltage of chip UC384X is set up rapidly, when this voltage is higher than the threshold voltage of switching tube Q3, and switching tube Q3 conducting, switching tube Q2 turn-offs, and resistance R 1 is cut, with the supplementary load loss of avoiding bringing when the inverter operate as normal.The effect of diode D1 be prevent when switching tube Q3 conducting with chip UC384X supply power voltage drag down, the effect of diode D3 is to stop switching tube Q3 open-minded when accessory power supply 8 is not activated.
As shown in Figure 2, when solar panel 1 descends output voltage because of load capacity is not enough, so that when being not enough to keep the work of accessory power supply 8, accessory power supply 8 turn-offs, transformer TX1 power down, switching tube Q3 turn-offs, because the minimum of the threshold voltage of switching tube Q2 after starting far below chip UC384X, so the rapid conducting of switching tube Q2 in a period of time after accessory power supply 8 quits work, resistance R 1 is articulated on the bus.The resistance of resistance R 1 is by the decision of the maximal input of accessory power supply 8, be articulated to the resistance R 1 on the bus when accessory power supply 8 turn-offs rapidly, has limited solar panel 1 too high open circuit voltage when zero load, thereby has avoided the error starting of accessory power supply 8.
As shown in Figure 3, when selected switching tube Q3 reliably open the raft threshold voltage less than 5V the time, also can adopt the switching signal of the 8th pin of chip UC384X as switching tube Q3.When chip UC384X operate as normal, its 8th pin is the burning voltage of 5V.When accessory power supply 8 was not worked, the 8th pin of chip UC384X did not have voltage, and switching tube Q3 turn-offs.After accessory power supply 8 started, the 5V voltage on its 8th pin made switching tube Q3 conducting, thereby switching tube Q2 turn-offs, and the off-load load-resistance R 1 that is added on the bus is excised.
Claims (6)
1. the circuit that can avoid repeatedly starting and stopping auxiliary power supply of photovoltaic inverter, it is characterized in that: this circuit is an off-load load switching circuit (6), off-load load switching circuit (6) is connected between the accessory power supply (8) of inlet highway electric capacity (2) and photovoltaic DC-to-AC converter, and solar panel (1) is powered to accessory power supply (8) by inlet highway electric capacity (2).
2. the circuit of avoiding repeatedly starting and stopping auxiliary power supply of photovoltaic inverter according to claim 1, it is characterized in that: described accessory power supply (8) comprises Power Conversion unit (3), described inlet highway electric capacity (2) respectively with the input of Power Conversion unit (3), off-load load switching circuit (6) links to each other, the output of Power Conversion unit (3) links to each other with output filter unit (4), output filter unit (4) links to each other with the signal input part of switch control unit (5) by feedback circuit (7), the signal output part of described switch control unit (5) respectively with Power Conversion unit (3), off-load load switching circuit (6) links to each other.
3. the circuit of avoiding repeatedly starting and stopping auxiliary power supply of photovoltaic inverter according to claim 1 and 2, it is characterized in that: described off-load load switching circuit (6) is by switching tube Q2, switching tube Q3, resistance R 1 and diode D1 form, the dc bus of one termination photovoltaic DC-to-AC converter of resistance R 1, the other end of resistance R 1 links to each other with the drain electrode of switching tube Q2, the grid of switching tube Q2 respectively with the drain electrode of switching tube Q3, the positive pole of diode D1 links to each other, the grid of switching tube Q3 links to each other with the positive pole of diode D3, switching tube Q2, the source electrode of switching tube Q3 connects the former border district of accessory power supply (8) respectively, play the dc bus of the termination photovoltaic DC-to-AC converter of dynamo-electric resistance R2, the other end that plays dynamo-electric resistance R2 links to each other with the positive pole of diode D1, described switch control unit (5) comprises chip UC384X, and the negative pole of diode D1 links to each other with the 7th pin of chip UC384X.
4. the circuit of avoiding repeatedly starting and stopping auxiliary power supply of photovoltaic inverter according to claim 2, it is characterized in that: described Power Conversion unit (3) comprises transformer TX1 and switching tube Q1, the grid of described switching tube Q1 links to each other with the output pin of chip UC384X by resistance R 4, described output filter unit (4) adopts the LC filter circuit, the former edge joint of transformer TX1 is between inlet highway electric capacity (2) and chip UC384X, and the secondary of transformer TX1 connects the LC filter circuit.
5. the circuit of avoiding repeatedly starting and stopping auxiliary power supply of photovoltaic inverter according to claim 3 is characterized in that: the resistance of described resistance R 1 is by the maximal input decision of the minimum starting resistor and the whole accessory power supply (8) of switch control unit (5).
6. the circuit of avoiding repeatedly starting and stopping auxiliary power supply of photovoltaic inverter according to claim 3 is characterized in that: described switching tube Q2, switching tube Q3 are any one during metal-oxide-semiconductor, triode and IGBT manage three kinds.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN2010101547099A CN101807850B (en) | 2010-04-23 | 2010-04-23 | Circuit capable of avoiding repeatedly starting and stopping auxiliary power supply of photovoltaic inverter |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2010101547099A CN101807850B (en) | 2010-04-23 | 2010-04-23 | Circuit capable of avoiding repeatedly starting and stopping auxiliary power supply of photovoltaic inverter |
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| CN101807850A true CN101807850A (en) | 2010-08-18 |
| CN101807850B CN101807850B (en) | 2012-08-29 |
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Cited By (21)
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|---|---|---|---|---|
| CN102355124A (en) * | 2011-09-14 | 2012-02-15 | 华为技术有限公司 | Device for avoiding frequent start stop of photovoltaic inverter and photovoltaic inverter |
| CN102570787A (en) * | 2012-02-08 | 2012-07-11 | 广东易事特电源股份有限公司 | Unloading circuit module for auxiliary power supply of photovoltaic inverter system |
| CN102611293A (en) * | 2012-03-22 | 2012-07-25 | 北京昆兰新能源技术有限公司 | Circuit for reducing repeated start frequency of auxiliary power supply of photovoltaic inverter |
| CN102694471A (en) * | 2012-05-24 | 2012-09-26 | 东华大学 | Auxiliary power supply system for photovoltaic inverter |
| CN102843022A (en) * | 2011-06-23 | 2012-12-26 | 深圳市汇川技术股份有限公司 | System and method for suppressing repeat start of photovoltaic inverter |
| CN102916612A (en) * | 2011-08-01 | 2013-02-06 | 上海英孚特电子技术有限公司 | Device for preventing repeated startup and stop of photovoltaic power generating system |
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| CN104158219A (en) * | 2014-08-27 | 2014-11-19 | 阳光电源股份有限公司 | Photovoltaic inverter shutdown control method and system and photovoltaic power generation system |
| CN104253429A (en) * | 2014-09-04 | 2014-12-31 | 北京天诚同创电气有限公司 | Online switching method, device and system for photovoltaic power generation unit |
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| WO2024149038A1 (en) * | 2023-01-13 | 2024-07-18 | 华为数字能源技术有限公司 | Power conversion device and control method therefor |
| CN116526429A (en) * | 2023-07-04 | 2023-08-01 | 深圳市首航新能源股份有限公司 | Inverter and energy storage system |
| CN116760275A (en) * | 2023-08-17 | 2023-09-15 | 成都吉瓦特科技有限公司 | Island-preventing circuit of miniature photovoltaic grid-connected inverter |
| CN116760275B (en) * | 2023-08-17 | 2023-11-03 | 成都吉瓦特科技有限公司 | Island-preventing circuit of miniature photovoltaic grid-connected inverter |
| CN117792064A (en) * | 2024-02-28 | 2024-03-29 | 美世乐(广东)新能源科技有限公司 | Auxiliary power supply system of photovoltaic inverter |
| CN117792064B (en) * | 2024-02-28 | 2024-05-07 | 美世乐(广东)新能源科技有限公司 | Auxiliary power supply system of photovoltaic inverter |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101807850B (en) | 2012-08-29 |
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Address after: 230001 East of 2nd Floor of No. 1699 Xiyou Road, Hefei High-tech Zone, Anhui Province Co-patentee after: Sun Grow Power Co., Ltd. Patentee after: Hefei Sunshine Information Technology Co., Ltd. Address before: 230088 Room 301, Entrepreneurship Service Center of Private Park, Hefei High-tech Zone, Anhui Province Co-patentee before: Sun Grow Power Co., Ltd. Patentee before: Hefei Solar Power Supply Information Technology Co., Ltd. |