CN202004452U - Controllable discharge circuit for photovoltaic inverter - Google Patents

Controllable discharge circuit for photovoltaic inverter Download PDF

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Publication number
CN202004452U
CN202004452U CN2011200916293U CN201120091629U CN202004452U CN 202004452 U CN202004452 U CN 202004452U CN 2011200916293 U CN2011200916293 U CN 2011200916293U CN 201120091629 U CN201120091629 U CN 201120091629U CN 202004452 U CN202004452 U CN 202004452U
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CN
China
Prior art keywords
chip
discharge
power tube
fuse
resistor
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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.)
Expired - Fee Related
Application number
CN2011200916293U
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Chinese (zh)
Inventor
蔡忠伟
韩天军
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SHANGHAI MEIKE NEW ENERGY CO Ltd
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SHANGHAI MEIKE NEW ENERGY CO Ltd
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Priority to CN2011200916293U priority Critical patent/CN202004452U/en
Application granted granted Critical
Publication of CN202004452U publication Critical patent/CN202004452U/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Abstract

A controllable discharge circuit for a photovoltaic inverter comprises chip resistors, discharge resistors, a fuse, a dynatron, a voltage stabilizing diode and a power tube. A BUS end is connected with one end of a chip resistor R4 and one end of a discharge resistor R5, the other end of the chip resistor R4 is connected with a collector of the dynatron Q1, one end of a chip resistor R3, a cathode of the voltage stabilizing diode ZD1 and a gate pole of the power tube Q2, and a base electrode of the dynatron Q1 is connected with one end of a chip resistor R1, one end of a chip resistor R2 and a discharge control end. The other end of the chip resistor R1 is connected with a voltage control end VCC, and the other end of the chip resistor R2 is grounded after being connected with an emitter electrode of the dynatron Q1, the other end of the chip resistor R3, an anode of the voltage stabilizing diode ZD1 and a source electrode of the power tube Q2. A leakage electrode of the power tube Q2 is connected with one end of a discharge resistor R6, the other end of the discharge resistor R6 is connected with one end of the fuse F1, and the other end of the fuse F1 is connected with the other end of the discharge resistor R5. By means of the controllable discharge circuit for the photovoltaic inverter, overall efficiency, safety and reliability of the photovoltaic inverter can be improved.

Description

A kind of controlled discharge circuit of photovoltaic DC-to-AC converter
Technical field
The utility model relates to photoelectric field, specifically a kind of controlled discharge circuit of photovoltaic DC-to-AC converter.
Background technology
Utilize solar power generation, become the trend of present generation of electricity by new energy.Photovoltaic combining inverter is as the core of photovoltaic generation, and its every performance index receive increasing concern.Under the requirement of satisfying the quality of power supply, security regulations standard, high efficiency becomes the important indicator of weighing inverter.
At present, the conversion efficiency of most solar panel is not high, and as another core of photovoltaic plant, the raising of photovoltaic combining inverter conversion efficiency seems and is even more important.Photovoltaic combining inverter input PV Panel voltage should be wide as far as possible, so that assembly is selected by integrator.But under lower voltage, can't finish the inversion process, thus before inverter circuit, increased a booster circuit, to realize the invert function of assembly under low-voltage.The BUS end is the Input voltage terminal of the output voltage of booster circuit and inverter circuit, and in order to stablize the BUS terminal voltage, it is dummy load that the output of booster circuit must have a resistance R, causes the damage of BUS end electrochemical capacitor with the output voltage upper punch that prevents booster circuit.
After increasing resistance R, can realize the function of voltage stabilizing.But resistance R is in "on" position always, power consumption is bigger, so require the resistance of resistance R to be the bigger the better.Yet after the inverter outage, the voltage of BUS end electrochemical capacitor will be put into the safe voltage value in the regular hour, to guarantee not exist shock hazard.In order to make the discharge of BUS end electrochemical capacitor faster, so require the resistance of resistance R the smaller the better.Therefore, it is vital designing a kind of controlled discharge circuit.
Summary of the invention
The purpose of this utility model is to overcome the deficiencies in the prior art, and a kind of discharge circuit that is used for photovoltaic DC-to-AC converter that can control is provided.
In order to achieve the above object, the utility model comprises Chip-R, discharge resistance, fuse, triode, voltage stabilizing didoe and power tube, it is characterized in that: BUS end respectively with the end of Chip-R R4, the end of discharge resistance R5 connects, the other end of Chip-R R4 respectively with the collector electrode of triode Q1, the end of Chip-R R3, the negative electrode of voltage stabilizing didoe ZD1, the gate pole of power tube Q2 connects, the base stage of triode Q1 respectively with the end of Chip-R R1, the end of Chip-R R2, the discharge control end connects, the other end of Chip-R R1 is connected with control voltage end VCC, the other end of Chip-R R2 respectively with the emitter of triode Q1, the other end of Chip-R R3, the anode of voltage stabilizing didoe ZD1, the source electrode of power tube Q2 connects back ground connection, the drain electrode of power tube Q2 is connected with the end of discharge resistance R6, the other end of discharge resistance R6 is connected with the end of fuse F1, and the other end of fuse F1 is connected with the other end of discharge resistance R5.
The utility model is compared with prior art, adopt lower higher discharge resistance, triode, voltage stabilizing didoe and the power tube of Chip-R, power consumption of power consumption, when the discharge circuit of realization photovoltaic DC-to-AC converter is controlled, the overall efficiency, reliability and the fail safe that have also improved photovoltaic DC-to-AC converter.
Description of drawings
Fig. 1 is a circuit diagram of the present utility model.
Embodiment
Now in conjunction with the accompanying drawings the utility model is described further.
Referring to Fig. 1, the utility model comprises Chip-R, discharge resistance, fuse, triode, voltage stabilizing didoe and power tube.BUS end respectively with the end of Chip-R R4, the end of discharge resistance R5 connects, the other end of Chip-R R4 respectively with the collector electrode of triode Q1, the end of Chip-R R3, the negative electrode of voltage stabilizing didoe ZD1, the gate pole of power tube Q2 connects, the base stage of triode Q1 respectively with the end of Chip-R R1, the end of Chip-R R2, the discharge control end connects, the other end of Chip-R R1 is connected with control voltage end VCC, the other end of Chip-R R2 respectively with the emitter of triode Q1, the other end of Chip-R R3, the anode of voltage stabilizing didoe ZD1, the source electrode of power tube Q2 connects back ground connection, the drain electrode of power tube Q2 is connected with the end of discharge resistance R6, the other end of discharge resistance R6 is connected with the end of fuse F1, and the other end of fuse F1 is connected with the other end of discharge resistance R5.
The utility model is when standby, and the output voltage of photovoltaic combining inverter input PV Panel is lower, and control voltage VCC is zero.At this moment, triode Q1 turn-offs, the driven power tube Q2 conducting of Chip-R R3.At this moment, discharge resistance R5 and discharge resistance R6 are in "on" position and power consumption are arranged, but owing to the photovoltaic combining inverter complete machine does not move, so there is not efficiency.
The utility model is when starting, and the output voltage of photovoltaic combining inverter input PV Panel rises, and causes controlling power work, and control voltage VCC is a definite value.At this moment, discharge control end signal is set to low level signal, makes triode Q1 turn-off power tube Q2 conducting.At this moment, booster circuit is in running order, and discharge resistance R5 and discharge resistance R6 are in "on" position and as the load of booster circuit.After booster circuit made the BUS terminal voltage stable, back level inverter circuit was started working, and sends energy to electrical network, and back level inverter circuit is the load of booster circuit.At this moment, discharge control end signal is set to high level signal, makes triode Q1 conducting, and power tube Q2 turn-offs after the triode Q1 conducting, and discharge resistance R5 and R6 excise from booster circuit, to reduce the wastage.
The utility model is when shutting down naturally or the barrier protection is shut down for some reason; discharge control end signal is set to low level signal, makes triode Q1 turn-off power tube Q2 conducting; thereby discharge resistance R5 and discharge resistance R6 are received the BUS end, begin to be the discharge of BUS end electrochemical capacitor.Because the resistance of discharge resistance R5 and discharge resistance R6 is less, can fast the BUS terminal voltage be dropped to below the safe voltage.

Claims (1)

1. the controlled discharge circuit of a photovoltaic DC-to-AC converter, comprise Chip-R, discharge resistance, fuse, triode, voltage stabilizing didoe and power tube, it is characterized in that: BUS end respectively with the end of Chip-R R4, the end of discharge resistance R5 connects, the other end of Chip-R R4 respectively with the collector electrode of triode Q1, the end of Chip-R R3, the negative electrode of voltage stabilizing didoe ZD1, the gate pole of power tube Q2 connects, the base stage of triode Q1 respectively with the end of Chip-R R1, the end of Chip-R R2, the discharge control end connects, the other end of Chip-R R1 is connected with control voltage end VCC, the other end of Chip-R R2 respectively with the emitter of triode Q1, the other end of Chip-R R3, the anode of voltage stabilizing didoe ZD1, the source electrode of power tube Q2 connects back ground connection, the drain electrode of power tube Q2 is connected with the end of discharge resistance R6, the other end of discharge resistance R6 is connected with the end of fuse F1, and the other end of fuse F1 is connected with the other end of discharge resistance R5.
CN2011200916293U 2011-03-31 2011-03-31 Controllable discharge circuit for photovoltaic inverter Expired - Fee Related CN202004452U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN2011200916293U CN202004452U (en) 2011-03-31 2011-03-31 Controllable discharge circuit for photovoltaic inverter

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN2011200916293U CN202004452U (en) 2011-03-31 2011-03-31 Controllable discharge circuit for photovoltaic inverter

Publications (1)

Publication Number Publication Date
CN202004452U true CN202004452U (en) 2011-10-05

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Family Applications (1)

Application Number Title Priority Date Filing Date
CN2011200916293U Expired - Fee Related CN202004452U (en) 2011-03-31 2011-03-31 Controllable discharge circuit for photovoltaic inverter

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CN (1) CN202004452U (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10097108B2 (en) 2014-12-16 2018-10-09 Abb Schweiz Ag Energy panel arrangement power dissipation
US10348094B2 (en) 2015-01-28 2019-07-09 Abb Schweiz Ag Energy panel arrangement shutdown
US10404060B2 (en) 2015-02-22 2019-09-03 Abb Schweiz Ag Photovoltaic string reverse polarity detection

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10097108B2 (en) 2014-12-16 2018-10-09 Abb Schweiz Ag Energy panel arrangement power dissipation
US10348094B2 (en) 2015-01-28 2019-07-09 Abb Schweiz Ag Energy panel arrangement shutdown
US10404060B2 (en) 2015-02-22 2019-09-03 Abb Schweiz Ag Photovoltaic string reverse polarity detection

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C14 Grant of patent or utility model
GR01 Patent grant
C17 Cessation of patent right
CF01 Termination of patent right due to non-payment of annual fee

Granted publication date: 20111005

Termination date: 20140331