CN102570787B - A kind of circuit for photovoltaic inverter system accessory power supply - Google Patents
A kind of circuit for photovoltaic inverter system accessory power supply Download PDFInfo
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- CN102570787B CN102570787B CN201210027111.2A CN201210027111A CN102570787B CN 102570787 B CN102570787 B CN 102570787B CN 201210027111 A CN201210027111 A CN 201210027111A CN 102570787 B CN102570787 B CN 102570787B
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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 discloses a kind of discharging circuit module for photovoltaic inverter system accessory power supply, comprise solar panel, inlet highway electric capacity, accessory power supply and discharging circuit module, described discharging circuit module is electrically connected between inlet highway electric capacity and accessory power supply, described discharging circuit module comprises the first resistance, second resistance, 4th resistance, second switch pipe and photoelectrical coupler, described first resistance is electrically connected between described inlet highway electric capacity and the drain electrode of second switch pipe, described second switch pipe source electrode connects elementaryly, the grid of second switch pipe is electrically connected at the collector electrode of described photoelectrical coupler, the emitter of described photoelectrical coupler connects elementaryly, the anode of photoelectrical coupler is electrically connected at the output of accessory power supply by the 4th resistance, the negative electrode of described photoelectrical coupler connects secondaryly.The invention solves the problem of repeatedly starting and stopping auxiliary power supply of photovoltaic inverter, when only having the power exported when solar panel to reach certain value, just start accessory power supply.
Description
Technical field
The present invention relates to Photovoltaic Inverter field, especially relate to a kind of circuit for photovoltaic inverter system accessory power supply.
Background technology
The way to take power that photovoltaic combining inverter accessory power supply is conventional is divided into from electrical network power taking, pushes up power taking mutually from electrical network and photovoltaic DC-to-AC converter DC bus, from photovoltaic DC-to-AC converter DC bus power taking three kinds.Wherein, when by the power taking of first two way to take power, accessory power supply will complete the conversion of AC/DC, needs rectifier bridge and larger input capacitance, has idling consumption at night simultaneously.And during from the power taking of photovoltaic DC-to-AC converter DC bus, due to weather reason cause sunlight very weak time, according to the output characteristic of solar panel, at this moment still have higher voltage and be added on photovoltaic DC-to-AC converter DC bus.When the voltage on photovoltaic DC-to-AC converter DC bus reaches the starting resistor of accessory power supply, accessory power supply will start, after starting, accessory power supply will from current drawn photovoltaic DC-to-AC converter DC bus, but the electric current of solar panel output is limited in this case, increase along with accessory power supply current drawn causes the voltage of photovoltaic DC-to-AC converter DC bus sharply to decline, cause the voltage of photovoltaic DC-to-AC converter DC bus cannot meet the requirement of accessory power supply, accessory power supply is forced to cut out; After accessory power supply cuts out, the voltage of solar panel rises to again higher value, and accessory power supply can start again.Iterative cycles like this goes down, and can cause larger injury to accessory power supply and photovoltaic combining inverter.
Chinese patent application 201010154709.9 discloses a kind of circuit avoiding repeatedly starting and stopping auxiliary power supply of photovoltaic inverter, this circuit is dump load switching circuit, this dump load switching circuit and accessory power supply combine, using the part of this dump load switching circuit as accessory power supply, and turning on and off of dump load switching circuit is all controlled by the primary circuit of accessory power supply.When accessory power supply shuts down, this dump load switching circuit carry is on the DC bus of photovoltaic DC-to-AC converter, and with the open circuit voltage suppressing solar panel too high when the low light level, the open circuit voltage avoiding too high solar panel causes accessory power supply start; Otherwise when the fan-out capability of solar panel enough makes auxiliary power start, dump load switching circuit is removed, and whole secondary power system normally works.
Meanwhile, switching off control circuit of dump load circuit is connected to the voltage reference of branch road or the accessory power supply chip of powering for power supply chip.Need to provide larger drive current in the shorter time when closing dump load switching circuit, dragged down by the voltage of branch road of powering for power supply chip possibly, cause power supply chip to be closed, accessory power supply is also forced to cut out.And the driving force that the voltage reference of power supply chip can provide is very little, power taking can cause the timing circuit fault of power supply chip from here, reduces chip reliability.
This dump load switching circuit is a part for accessory power supply, it not standalone module, cause being only applicable to specific accessory power supply topology, and accessory power supply chip adopts specific more traditional power supply chip UC384X, this just causes this dump load switching circuit cannot carry the novel power supply chip of use, and cannot avoid repeatedly starting and stopping auxiliary power supply under certain conditions.
Patent application 201010154709.9 only considers accessory power supply power demand, does not consider enough surpluses.The power exported when solar panel can meet accessory power supply needs, auxiliary power start, if electrical network meets the requirements, inverter also can start, if the power that at this moment solar panel exports only enough meets accessory power supply needs, inverter one starts, and the voltage on photovoltaic DC-to-AC converter DC bus equally likely can decline because output current increases, and accessory power supply equally likely cuts out.Even if accessory power supply does not cut out, if when the power that the photovoltaic DC-to-AC converter that rated power is several kilowatts exports only has tens watts even lower, the output current Severe distortion of photovoltaic DC-to-AC converter, at this moment grid-connected all do not have benefit to photovoltaic DC-to-AC converter itself and electrical network.
Summary of the invention
The defect that the present invention be directed to the existence of above-mentioned background technology provides a kind of circuit for photovoltaic inverter system accessory power supply, solve the problem of repeatedly starting and stopping auxiliary power supply of photovoltaic inverter, when only having the power exported when solar panel to reach certain value, just start accessory power supply.
For achieving the above object, the invention discloses a kind of circuit for photovoltaic inverter system accessory power supply, it comprises solar panel, inlet highway electric capacity, accessory power supply and discharging circuit module, described discharging circuit module is electrically connected between the accessory power supply of described inlet highway electric capacity and photovoltaic inverter system, described accessory power supply is from described bus capacitor power taking, described discharging circuit module comprises the first resistance, second resistance, 4th resistance, second switch pipe and photoelectrical coupler, described first resistance is electrically connected between the drain electrode of described inlet highway electric capacity and described second switch pipe, the source electrode of described second switch pipe connects elementaryly, the grid of described second switch pipe is electrically connected at the transistor collector of described photoelectrical coupler, the transistor emitter of described photoelectrical coupler connects elementaryly, the diode anode of described photoelectrical coupler is electrically connected at the output of described accessory power supply by described 4th resistance, the diode cathode of described photoelectrical coupler connects secondaryly.
Further, described accessory power supply comprises primary source unit, secondary power unit and transformer unit, described primary source unit comprises power supply chip and the first switching tube, described power supply chip comprises chip power supply pin, described chip power supply pin is electrically connected with starting resistance, the described starting resistance other end and described inlet highway electric capacity are electrically connected, and the grid of the second switch pipe of described discharging circuit module is electrically connected described starting resistance one end by the second resistance; The grid of described first switching tube is electrically connected with the 3rd resistance, and described 3rd resistance one end and described power supply chip output are electrically connected; Described transformer unit is electrically connected between described primary source unit and described secondary power unit.
Further, described second switch pipe is any one in metal-oxide-semiconductor, triode and IGBT pipe three kinds.
In sum, a kind of circuit for photovoltaic inverter system accessory power supply of the present invention by being electrically connected discharging circuit module between inlet highway electric capacity and accessory power supply, there is provided current circuit to be fallen by the energy ezpenditure that solar panel produces when low-light, solar panel is avoided to occur open-circuit condition, prevent solar panel from occurring the phenomenon of voltage virtual height, the power that can control to export at solar panel by the size adjusting the first resistance just starts accessory power supply when reaching certain value, guarantee that accessory power supply can not repeatedly starting and stopping, ensure that the controllability that auxiliary power supply of photovoltaic inverter starts and stability.
Accompanying drawing explanation
Fig. 1 is the theory diagram of the embodiment of the present invention.
Fig. 2 is the structural representation shown in Fig. 1.
Embodiment
For feature of the present invention, technological means and the specific purposes reached, function can be understood further, below in conjunction with accompanying drawing and embodiment, the present invention is described in further detail.
As depicted in figs. 1 and 2, a kind of circuit for photovoltaic inverter system accessory power supply of the present invention comprises solar panel 10, inlet highway electric capacity 20, accessory power supply 30 and discharging circuit module 40, described discharging circuit module 40 is electrically connected between the accessory power supply 30 of described inlet highway electric capacity 20 and photovoltaic inverter system, when photovoltaic inverter system uses Boost circuit to do prime, described inlet highway electric capacity 20 is the output capacitance of Boost circuit, and described accessory power supply 30 is from the power taking of described bus capacitor 20.
Described accessory power supply 30 comprises primary source unit 31, secondary power unit 32 and transformer unit 33, described primary source unit 31 comprises power supply chip U1 and the first switching tube Q1, described power supply chip U1 comprises chip power supply pin VCC, described chip power supply pin VCC is electrically connected with starting resistance R0, the described starting resistance R0 other end and described inlet highway electric capacity 20 are electrically connected, the resistance of described starting resistance R0 and the minimum starting current of described power supply chip U1 determine the minimum starting resistor of described accessory power supply 30, the resistance of corresponding starting resistance R0 can be selected by the minimum starting resistor that sets described accessory power supply 30 and the minimum starting current of described power supply chip U1 that checks in, the grid of described first switching tube Q1 is electrically connected with the 3rd resistance R3, and described 3rd resistance R3 one end and described power supply chip U1 output are electrically connected, described secondary power unit 32 comprises current rectifying and wave filtering circuit 321, and described current rectifying and wave filtering circuit 321 forms, for exporting low-voltage DC primarily of diode D2, the second electric capacity C2, the 3rd electric capacity C3, the 5th electric capacity C5, the 6th electric capacity C6 and inductance L 1, described transformer unit 33 comprises transformer T, and described transformer T is electrically connected between described primary source unit 31 and described secondary power unit 32.
Described accessory power supply 30 switching circuit can be inverse-excitation type, also can adopt other conventional switching circuit structure.In photovoltaic inverter system, because accessory power supply 30 is directly from power taking inlet highway electric capacity 20, the input voltage range that the input voltage range of accessory power supply 30 is specified with photovoltaic inverter system is consistent, for ensureing accessory power supply 30 reliability of operation, suitable switching circuit structure need be selected according to the input voltage range of accessory power supply 30 and accessory power supply 30 power output; When the input voltage of accessory power supply 30 is higher, select double tube positive exciting formula or double-transistor flyback formula, select inverse-excitation type when accessory power supply 30 input voltage is lower and power output is less.
Described discharging circuit module 40 comprises the first resistance R1, the second resistance R2, the 4th resistance R4, second switch pipe Q2 and photoelectrical coupler U2, and described second switch pipe Q2 is any one in metal-oxide-semiconductor, triode and IGBT pipe three kinds; Described first resistance R1 is the load resistance of described discharging circuit module 40, and described first resistance R1 is electrically connected between the drain electrode of described inlet highway electric capacity 20 and described second switch pipe Q2, and the source electrode of described second switch pipe Q2 connects elementaryly; The grid of described second switch pipe Q2 is electrically connected described starting resistance R0 one end by the second resistance R2, the grid of described second switch pipe Q2 is electrically connected the transistor collector of described photoelectrical coupler U2 simultaneously, the transistor emitter of described photoelectrical coupler U2 connects elementaryly, the diode anode of described photoelectrical coupler U2 is electrically connected at the output of described secondary power unit 32 by described 4th resistance R4, the diode cathode of described photoelectrical coupler U2 connects secondaryly.
When the present invention uses, the resistance of described first resistance R1 is determined by the minimum starting resistor of described accessory power supply 30 and set photovoltaic inverter system starting power.When the voltage of described inlet highway electric capacity 20 does not reach the minimum starting resistor of described accessory power supply 30, described first resistance R1 bears the DC bus-bar voltage of described inlet highway electric capacity 20, the energy ezpenditure that described solar panel 10 produces is fallen, ensure that DC bus-bar voltage is less than the starting resistor of described accessory power supply 30, accessory power supply 30 is in non operating state.In the present embodiment, assuming that the minimum starting resistor of accessory power supply 30 is 150V, if photovoltaic inverter system requires that minimum starting power is 50W, then below the minimum starting resistor of accessory power supply 30, the energy that solar panel 10 produces will be consumed by the first resistance R1, and the resistance that can calculate R1 is 450 ohm.
In the present embodiment, accessory power supply 30 switching circuit is inverse-excitation type, and the model of described power supply chip U1 is UC2845.When solar irradiation is more weak, solar panel 10 output voltage is lower, the electric current flowing through starting resistance R0 is less than the minimum starting current of power supply chip U1, voltage on the chip power supply pin VCC of power supply chip U1 cannot reach the threshold voltage of the minimum startup of power supply chip U1, and accessory power supply 30 can not work.Along with the voltage of inlet highway electric capacity 20 raises, the electric current flowing through starting resistance R0 increases gradually, the grid voltage of second switch pipe Q2 also slowly raises, when the grid voltage of second switch pipe Q2 opens threshold voltage (2.5 ~ 5V) higher than second switch pipe Q2, second switch pipe Q2 conducting, discharging circuit module 40 forms path, and the energy that solar panel 10 produces consumes on the first resistance R1; And the starting resistor of power supply chip U1 is higher than the threshold voltage of opening of second switch pipe Q2, before accessory power supply 30 not work, discharging circuit module 40 conducting, for solar panel 10 provides energy leakage path, avoid the open-circuit condition of solar panel 10, there will not be voltage virtual height phenomenon.
When solar irradiation strengthens, solar panel 10 output voltage raises gradually, when the energy that solar panel 10 produces exceedes the minimum value of photovoltaic inverter system setting, the voltage of inlet highway electric capacity 20 will rise to the minimum starting resistor of accessory power supply 30, the electric current flowing through starting resistance R0 meets the needs of power supply chip U1 startup, the voltage of powering for power supply chip U1 reaches the minimum voltage that power supply chip U1 requires, accessory power supply 30 starts.After accessory power supply 30 starts, the output voltage of secondary power unit 32 reaches stationary value, the output voltage of secondary power unit 32 flows through the diode anode of photoelectrical coupler U2 through the 4th resistance R4, the triode of photoelectrical coupler U2 is passed the signal along to after diode current flow, make triode ON, now the grid of second switch pipe Q2 connects elementaryly, second switch pipe Q2 grid voltage is made to open threshold voltage lower than second switch pipe Q2, second switch pipe Q2 disconnects, first resistance R1 path is cut off, no longer consumed energy.The least energy that the energy that solar panel 10 produces requires higher than photovoltaic inverter system, photovoltaic inverter system can start.
When solar irradiation dies down again, the energy that solar panel 10 produces just can be less than the energy that photovoltaic inverter system requires, now the output voltage of secondary power unit 32 just can decline, when the output voltage of secondary power unit 32 is lower than certain value, the diode of photoelectrical coupler U2 can not conducting, the triode of photoelectrical coupler U2 just can disconnect, and second switch pipe Q2 grid voltage just can rise, when second switch pipe Q2 grid voltage opens threshold voltage higher than second switch pipe Q2 grid, second switch pipe Q2 gate turn-on, discharging circuit module 40 forms path, inlet highway electric capacity 20 voltage is pulled down to below accessory power supply 30 starting resistor, accessory power supply 30 cuts out.
In sum, a kind of circuit for photovoltaic inverter system accessory power supply of the present invention by being electrically connected discharging circuit module 40 between inlet highway electric capacity 20 and accessory power supply 30, there is provided current circuit to be fallen by the energy ezpenditure that solar panel 10 produces when low-light, solar panel 10 is avoided to occur open-circuit condition, prevent solar panel 10 from occurring the phenomenon of voltage virtual height, the power that can control to export at solar panel 10 by the size adjusting the first resistance R1 just starts accessory power supply 30 when reaching certain value, guarantee that accessory power supply 30 can not repeatedly starting and stopping, ensure that the controllability that auxiliary power supply of photovoltaic inverter 30 starts and stability, the present invention is simultaneously applicable to the accessory power supply switching circuit of various structure, does not need specific power supply chip, has applicability widely.
The above embodiment only have expressed one embodiment of the present invention, and it describes comparatively concrete and detailed, but therefore can not be interpreted as limitation of the scope of the invention.It should be pointed out that for the person of ordinary skill of the art, without departing from the inventive concept of the premise, can also make some distortion and improvement, these all belong to protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with claims.
Claims (3)
1. the circuit for photovoltaic inverter system accessory power supply, it is characterized in that: comprise solar panel (10), inlet highway electric capacity (20), accessory power supply (30) and discharging circuit module (40), described accessory power supply (30) comprises primary source unit (31), described primary source unit (31) comprises power supply chip (U1), described power supply chip (U1) comprises chip power supply pin (VCC), described chip power supply pin (VCC) is electrically connected with starting resistance (R0), described starting resistance (R0) other end and described inlet highway electric capacity (20) are electrically connected, described discharging circuit module (40) is electrically connected between the accessory power supply (30) of described inlet highway electric capacity (20) and photovoltaic inverter system, described accessory power supply (30) is from described bus capacitor (20) power taking, described discharging circuit module (40) comprises the first resistance (R1), second resistance (R2), 4th resistance (R4), second switch pipe (Q2) and photoelectrical coupler (U2), described first resistance (R1) is electrically connected between the drain electrode of described inlet highway electric capacity (20) and described second switch pipe (Q2), the resistance of the first resistance (R1) is determined by the minimum starting resistor of described accessory power supply (30) and set photovoltaic inverter system starting power, the source electrode of described second switch pipe (Q2) connects elementaryly, the grid of the second switch pipe (Q2) of described discharging circuit module (40) is electrically connected described starting resistance (R0) one end by the second resistance (R2), the grid of described second switch pipe (Q2) is electrically connected at the transistor collector of described photoelectrical coupler (U2), the transistor emitter of described photoelectrical coupler (U2) connects elementaryly, the diode anode of described photoelectrical coupler (U2) is electrically connected at the output of described accessory power supply (30) by described 4th resistance (R4), the diode cathode of described photoelectrical coupler (U2) connects secondaryly, the starting resistor of described power supply chip (U1) opens threshold voltage higher than second switch pipe (Q2).
2. a kind of circuit for photovoltaic inverter system accessory power supply according to claim 1, it is characterized in that: described accessory power supply (30) also comprises secondary power unit (32) and transformer unit (33), described primary source unit (31) also comprises the first switching tube (Q1); The grid of described first switching tube (Q1) is electrically connected with the 3rd resistance (R3), and described 3rd resistance (R3) one end and described power supply chip (U1) output are electrically connected; Described transformer unit (33) is electrically connected between described primary source unit (31) and described secondary power unit (32).
3. a kind of circuit for photovoltaic inverter system accessory power supply according to claim 1, is characterized in that: described second switch pipe (Q2) is metal-oxide-semiconductor, any one in triode and IGBT pipe three kinds.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210027111.2A CN102570787B (en) | 2012-02-08 | 2012-02-08 | A kind of circuit for photovoltaic inverter system accessory power supply |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210027111.2A CN102570787B (en) | 2012-02-08 | 2012-02-08 | A kind of circuit for photovoltaic inverter system accessory power supply |
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| CN102570787A CN102570787A (en) | 2012-07-11 |
| CN102570787B true CN102570787B (en) | 2015-08-05 |
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| CN201210027111.2A Active CN102570787B (en) | 2012-02-08 | 2012-02-08 | A kind of circuit for photovoltaic inverter system accessory power supply |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104348347B (en) * | 2013-08-09 | 2017-02-15 | 华为技术有限公司 | Starting circuit for auxiliary power supply of photovoltaic inverter |
| CN105450058B (en) | 2014-06-20 | 2018-03-16 | 华为技术有限公司 | A kind of inverter and its control device, control method and inverter system |
| CN105262432B (en) * | 2015-10-09 | 2017-09-15 | 深圳职业技术学院 | A kind of distributed integrated power generation circuit and its control method |
| CN114498738A (en) * | 2022-01-21 | 2022-05-13 | 华为数字能源技术有限公司 | Photovoltaic inverter and solar power generation system |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN201663429U (en) * | 2010-01-20 | 2010-12-01 | 哈尔滨理工大学 | Off-grid type sine-wave wind power generation controller |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201663429U (en) * | 2010-01-20 | 2010-12-01 | 哈尔滨理工大学 | Off-grid type sine-wave wind power generation controller |
| 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 |
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