CN108666978A - A kind of photovoltaic switching off device bleeder circuit - Google Patents
A kind of photovoltaic switching off device bleeder circuit Download PDFInfo
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- CN108666978A CN108666978A CN201810698469.5A CN201810698469A CN108666978A CN 108666978 A CN108666978 A CN 108666978A CN 201810698469 A CN201810698469 A CN 201810698469A CN 108666978 A CN108666978 A CN 108666978A
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- triode
- bleeder circuit
- resistance
- photovoltaic module
- switching
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- 230000002459 sustained effect Effects 0.000 claims abstract description 11
- 238000010586 diagram Methods 0.000 description 5
- 230000015572 biosynthetic process Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000003491 array Methods 0.000 description 1
- 210000004209 hair Anatomy 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/10—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers
- H02H7/12—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers
- H02H7/1213—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers for DC-DC converters
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Protection Of Static Devices (AREA)
- Direct Current Feeding And Distribution (AREA)
- Photovoltaic Devices (AREA)
Abstract
The invention discloses a kind of photovoltaic switching off device bleeder circuits, including photovoltaic module VPV, input capacitance C4, first switch pipe Q1, sustained diode 1, LC trappers, output capacitance C5 and control unit；The input capacitance C4 and photovoltaic module VPV is connected in parallel, the anode of photovoltaic module is connected with the cathode of sustained diode 1, cathode is connected by first switch pipe Q1, LC trapper with 1 anode of sustained diode, and the base stage of first switch pipe Q1 is connected with control unit；The both ends parallel resistance R1 and two-way bleeder circuit of the output capacitance C5 uses switch controlled per bleeder circuit all the way, and the control terminal per the switching tube of bleeder circuit all the way is connected with control unit.When the present invention can effectively realize switching off device shutdown, when photovoltaic module open-circuit voltage is 40V, output voltage is only 0.8V, and output current can reach 10mA, and circuit is simple, at low cost, and output bleeder circuit two-way is in parallel, and reliability is high.
Description
Technical field
The present invention relates to a kind of photovoltaic circuit more particularly to a kind of photovoltaic switching off device bleeder circuits, belong to power electronics change
Exchanger technology field.
Background technology
It rapidly switches off, is the photovoltaic plant safeguard protection concept introduced from the U.S..The it is proposed for rapidly switching off concept, for right
Fire fighter, photovoltaic plant installation and the protection of maintenance personal, because photovoltaic plant DC side has high direct voltage, as long as there is the sun
Irradiation, the high direct voltage of solar panel side just always exist, once fire occurs for photovoltaic plant, before entire power station has been burnt,
Fire fighter can not carry out fire extinguishing rescue.
Therefore, photovoltaic plant DC side is rapidly switched off in National Electrical specification NEC 2014 and NEC 2017 and is all carried
Go out and has been distinctly claimed.It will start formal execute on January 1st, 2019.NEC 2017 is provided：" except string formation, controller installation
In the range of within 0.3 meter of distance arrays and being more than 1 meter apart from access point, after rapidly switching off, system needs 30 seconds
Inside it is down to 30V；Within string formation, it is down to 80V in 30 seconds, conveniently takes safe rescue measure." single component output voltage
0.6V is had to be larger than, is investigated convenient for system problem.
Invention content
Technical problem to be solved by the invention is to provide a kind of photovoltaic switching off device bleeder circuits, can reduce cost, can
It is easy to implement by property height, meet the requirement that Code of Federal Regulations rapidly switches off.
The present invention to solve above-mentioned technical problem and the technical solution adopted is that provide a kind of photovoltaic switching off device bleeder circuit,
Including：Photovoltaic module VPV, input capacitance C4, first switch pipe Q1, sustained diode 1, LC trappers, output capacitance C5 and control
Unit processed；One end of the output capacitance C5 connects first lead-out terminal, and the other end connection second of the output capacitance C5 is defeated
Go out terminal；
The input capacitance C4 and photovoltaic module VPV is connected in parallel, the anode and fly-wheel diode of the photovoltaic module VPV
The cathode of D1 is connected, and the cathode of the photovoltaic module VPV is connected with the drain electrode of first switch pipe Q1, the first switch pipe Q1's
Source electrode is connected with one end of LC trappers, and the other end of the LC trappers is connected with 1 anode of sustained diode, and described first
The base stage of switching tube Q1 is connected with control unit；
The both ends parallel resistance R1 and two-way bleeder circuit of the output capacitance C5 uses switching tube per bleeder circuit all the way
Control, the control terminal per the switching tube of bleeder circuit all the way are connected with control unit；
The first lead-out terminal is connected with the anode of photovoltaic module VPV, and second output terminal passes through second switch
Pipe is connected with photovoltaic module VPV cathode, and the control terminal of the second switch pipe is connected with control unit.
Above-mentioned photovoltaic switching off device bleeder circuit, wherein the second switch pipe is triode Q2, the second output terminal
Son is connected by resistance R2 with the collector of triode Q2, and the emitter of the triode Q2 is connected with photovoltaic module VPV cathode,
The base stage of the triode Q2 is connected by resistance R3 with control unit；When switching off device breaks down, at the triode Q2
In off state so that voltage becomes 0V between first lead-out terminal and second output terminal.
Above-mentioned photovoltaic switching off device bleeder circuit, wherein bleeder circuit is controlled using triode Q3 and triode Q5 all the way,
Another way bleeder circuit is using triode Q4 and triode Q6 controls；The triode Q5 and triode Q6 be PNP pipe, described three
Pole pipe Q3 and triode Q4 manages for NPN；The emitter of the triode Q5 is connected with first lead-out terminal, the triode Q5's
Collector is connected by resistance R4 with second output terminal, the collection that the base stage of the triode Q5 passes through resistance R5 and triode Q3
Electrode is connected, and the emitter of the triode Q3 is connected with the cathode of photovoltaic module, and the base stage of the triode Q3 passes through resistance
R6 is connected with control unit；The emitter of the triode Q6 is connected with first lead-out terminal, the collector of the triode Q6
It is connected with second output terminal by resistance R7, the collector phase that the base stage of the triode Q6 passes through resistance R8 and triode Q4
Even, the emitter of the triode Q4 is connected with the cathode of photovoltaic module, and the base stage of the triode Q4 passes through resistance R9 and control
Unit processed is connected.
Above-mentioned photovoltaic switching off device bleeder circuit, wherein when first switch pipe Q1 is in the conduction state, the triode
Q5 and triode Q6 cut-offs, bleeder circuit do not work；When first switch pipe Q1 is off state, bleeder circuit work；When
When input voltage is 40V, it is 0.8V~1.0V to control voltage between first lead-out terminal and second output terminal.
The present invention, which compares the prior art, following advantageous effect：Photovoltaic switching off device bleeder circuit provided by the invention, tool
It has the advantage that：(1) at low cost, efficient, reliability is high；(2) self problem or system problem can be investigated out well.
Description of the drawings
Fig. 1 is a kind of photovoltaic switching off device bleeder circuit schematic diagram in the embodiment of the present invention；
Fig. 2 is the two-way bleeder circuit signal of the photovoltaic switching off device bleeder circuit output end parallel connection in the embodiment of the present invention
Figure；
Fig. 3 is the control terminal connection diagram of the photovoltaic switching off device bleeder circuit in the embodiment of the present invention.
Specific implementation mode
A kind of photovoltaic switching off device bleeder circuit in the embodiment of the present invention, it is efficient, the characteristic of original system is not influenced, it can
By property height, implement simply, it is easy to maintain.
It is understandable to enable above-mentioned purpose, feature and the advantageous effect of the present invention to become apparent, below in conjunction with the accompanying drawings to this
The specific example of invention is described in detail.
Fig. 1 is a kind of photovoltaic switching off device bleeder circuit schematic diagram in the embodiment of the present invention；Fig. 2 is in the embodiment of the present invention
Photovoltaic switching off device bleeder circuit output end parallel connection two-way bleeder circuit schematic diagram；Fig. 3 is the photovoltaic in the embodiment of the present invention
The control terminal connection diagram of switching off device bleeder circuit.
Referring to FIG. 1, Fig. 2 and Fig. 3, a kind of photovoltaic switching off device bleeder circuit provided by the invention, including photovoltaic module
VPV, input capacitance C4, first switch pipe Q1, sustained diode 1, LC trappers, output capacitance C5, NPN triode Q2, Q3,
Q4, PNP triode Q5, Q6, resistance R1, R2, R3, R4, R5, R6, R7, R8, R9, control unit, first lead-out terminal 1-1 and
Two leading-out terminal 1-2；Q2 in figure, Q3, Q4, Q5, Q6 are not limited solely to triode, equally can be other switching tubes (such as
Mosfet, IGBT, GTO etc.).
Photovoltaic switching off device bleeder circuit provided by the invention, input capacitance C4 are connected in parallel with photovoltaic module VPV, photovoltaic group
The anode of part VPV is connected with the cathode of sustained diode 1, the drain electrode phase of the cathode and first switch pipe Q1 of photovoltaic module VPV
Even, the source electrode of the first switch pipe Q1 is connected with one end of LC trappers, the other end and the sustained diode 1 of LC trappers
Anode is connected；LC trappers are made of L1, C1.
Photovoltaic switching off device bleeder circuit provided by the invention, first lead-out terminal 1-1 and first lead-out terminal 1-2 and output
Capacitance C5, resistance R1 are in parallel；Resistance R2 is connected with the sub- 1-2 of second output terminal and triode Q2 collectors respectively, triode Q2 hairs
Emitter-base bandgap grading is connected with photovoltaic module VPV cathode, and triode Q2 base stages are connected with the one end resistance R3, the resistance R3 other ends and control unit
It is connected and receives CPU control signals PA0.
Photovoltaic switching off device bleeder circuit provided by the invention, triode Q5, Q6 are PNP pipe, emitter and the first output end
Sub- 1-1 is connected, and for collector respectively with resistance R4, one end of R7 is connected, other end and the sub- 1- of second output terminal of resistance R4, R7
2 are connected, and respectively with resistance R5, one end of R8 is connected for the base stage of triode Q5, Q6, and the other end of resistance R5, R8 is respectively with three
The collector of pole pipe Q3, Q4 are connected, and the emitter of triode Q3, Q4 are connected with the cathode of photovoltaic module, the base of triode Q3, Q4
Pole is connected with resistance R6, R9 respectively, and the other end of resistance R6, R9 are connected with control unit, receives control signal PA1.
Photovoltaic switching off device bleeder circuit provided by the invention, between first lead-out terminal 1-1 and the sub- 1-2 of second output terminal
Bleeder circuit two-way is in parallel, and PA1 control signals are provided by control unit, when switching off device detects that signal opens first switch pipe Q1
When, it is low level first to make PA1 signals, is then turned on first switch pipe Q1, such triode Q3, Q4 without base current, triode Q3,
Q4 ends, and the base stage of triode Q5, Q6 are not turned on, are also flowed through without base current, Q5, and Q6 cut-offs, voltage is essentially between R5, R8
0V, bleeder circuit no power waste；When switching off device can't detect signal and close first switch pipe Q1 after more than 16S, then set
High PA1 controls signal, such triode Q3, and Q4 base stages have electric current to flow through, collector conducting, triode Q5, and Q6 is also switched on, resistance
R5, R8 work, and output voltage is equal to (R5+R8) * Vpv/R2, and as desired by R5 is chosen, R8, R2 are suitably worth, can make
When Vpv is equal to 40V, the voltage between first lead-out terminal 1-1 and the sub- 1-2 of second output terminal is 0.8V.That is, working as
When photovoltaic module open-circuit voltage is 40V, output voltage is only 0.8V~1.0V, and output current can reach 10mA, and circuit is simple, at
This is low, and output bleeder circuit two-way is in parallel, and reliability is high.
The present invention in addition in parallel a resistance and triode between Q1, its object is to detect switching off device shutdown whether by
The shutdown caused by problem itself, when control unit work, PA0 is constantly on, but work as control unit due to power supply or
When problem itself causes it not work, PA0 is in low-voltage, and Q2 base stage no currents flow through, and Q2 cut-offs, R2 does not work, switching tube
The resistance Rmos of Q2 is equivalent to infinity, while PA1 is also at low level, triode Q5, Q6 cut-off, resistance R5, and R8 does not work,
So output voltage is equal to R1*Vpv/Rmos, substantially equal to 0V.
Photovoltaic switching off device bleeder circuit provided by the invention, has the following advantages：
(1) at low cost, efficient, reliability is high；
(2) self problem or system problem can be investigated out well；
Although the present invention is disclosed as above with preferred embodiment, however, it is not to limit the invention, any this field skill
Art personnel, without departing from the spirit and scope of the present invention, when can make a little modification and it is perfect, therefore the present invention protection model
It encloses to work as and is subject to what claims were defined.
Claims (4)
1. a kind of photovoltaic switching off device bleeder circuit, which is characterized in that including：
Photovoltaic module VPV, input capacitance C4, first switch pipe Q1, sustained diode 1, LC trappers, output capacitance C5 and control
Unit processed；One end of the output capacitance C5 connects first lead-out terminal, and the other end connection second of the output capacitance C5 is defeated
Go out terminal；
The input capacitance C4 and photovoltaic module VPV is connected in parallel, anode and the sustained diode 1 of the photovoltaic module VPV
Cathode is connected, and the cathode of the photovoltaic module VPV is connected with the drain electrode of first switch pipe Q1, the source electrode of the first switch pipe Q1
It is connected with one end of LC trappers, the other end of the LC trappers is connected with 1 anode of sustained diode, the first switch
The base stage of pipe Q1 is connected with control unit；
The both ends parallel resistance R1 and two-way bleeder circuit of the output capacitance C5, per bleeder circuit all the way using switch management and control
System, the control terminal per the switching tube of bleeder circuit all the way are connected with control unit；
The first lead-out terminal is connected with the anode of photovoltaic module VPV, second output terminal by second switch pipe with
Photovoltaic module VPV cathode are connected, and the control terminal of the second switch pipe is connected with control unit.
2. photovoltaic switching off device bleeder circuit according to claim 1, which is characterized in that the second switch pipe is triode
Q2, second output terminal are connected by resistance R2 with the collector of triode Q2, the emitter and light of the triode Q2
It lies prostrate component VPV cathode to be connected, the base stage of the triode Q2 is connected by resistance R3 with control unit；When switching off device breaks down
When, the triode Q2 is off state so that voltage becomes 0V between first lead-out terminal and second output terminal.
3. photovoltaic switching off device bleeder circuit according to claim 1, which is characterized in that bleeder circuit uses triode all the way
Q3 and triode Q5 controls, another way bleeder circuit is using triode Q4 and triode Q6 controls；The triode Q5 and three poles
Pipe Q6 is that PNP pipe, the triode Q3 and triode Q4 manage for NPN；
The emitter of the triode Q5 is connected with first lead-out terminal, and the collector of the triode Q5 passes through resistance R4 and
Two leading-out terminals are connected, and the base stage of the triode Q5 is connected by resistance R5 with the collector of triode Q3, the triode
The emitter of Q3 is connected with the cathode of photovoltaic module, and the base stage of the triode Q3 is connected by resistance R6 with control unit；
The emitter of the triode Q6 is connected with first lead-out terminal, and the collector of the triode Q6 passes through resistance R7 and
Two leading-out terminals are connected, and the base stage of the triode Q6 is connected by resistance R8 with the collector of triode Q4, the triode
The emitter of Q4 is connected with the cathode of photovoltaic module, and the base stage of the triode Q4 is connected by resistance R9 with control unit.
4. photovoltaic switching off device bleeder circuit according to claim 3, which is characterized in that when first switch pipe Q1 is on
When state, the triode Q5 and triode Q6 cut-offs, bleeder circuit do not work；When first switch pipe Q1 is off state
When, bleeder circuit work；When input voltage is 40V, controlling voltage between first lead-out terminal and second output terminal is
0.8V~1.0V.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810698469.5A CN108666978B (en) | 2018-06-29 | 2018-06-29 | Voltage dividing circuit of photovoltaic turnoff device |
| PCT/CN2018/115019 WO2020000863A1 (en) | 2018-06-29 | 2018-11-12 | Voltage dividing circuit for photovoltaic shutdown device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810698469.5A CN108666978B (en) | 2018-06-29 | 2018-06-29 | Voltage dividing circuit of photovoltaic turnoff device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108666978A true CN108666978A (en) | 2018-10-16 |
| CN108666978B CN108666978B (en) | 2024-02-02 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810698469.5A Active CN108666978B (en) | 2018-06-29 | 2018-06-29 | Voltage dividing circuit of photovoltaic turnoff device |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN108666978B (en) |
| WO (1) | WO2020000863A1 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2020000863A1 (en) * | 2018-06-29 | 2020-01-02 | 江苏集能易新能源技术有限公司 | Voltage dividing circuit for photovoltaic shutdown device |
| CN114050811A (en) * | 2022-01-13 | 2022-02-15 | 杭州禾迈电力电子股份有限公司 | Multi-input shutoff device, control method and photovoltaic power generation system |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10136562A (en) * | 1996-10-31 | 1998-05-22 | Fujitsu Ltd | Power supply switch circuit |
| US20020027756A1 (en) * | 2000-08-18 | 2002-03-07 | Daniel Lopez | Battery-operated power supply unit |
| CN201061122Y (en) * | 2007-06-25 | 2008-05-14 | 深圳市麦格米特电气技术有限公司 | AC power-off fast closedown circuit |
| EP2439829A2 (en) * | 2010-10-08 | 2012-04-11 | VWL Umweltcentrum für Haustechnik | Assembly for secure deactivation of photovoltaic assemblies |
| CN103001544A (en) * | 2012-11-14 | 2013-03-27 | 华为技术有限公司 | Photovoltaic generation system and control method thereof |
| CN103779829A (en) * | 2012-10-19 | 2014-05-07 | 鸿富锦精密工业（深圳）有限公司 | Load protection circuit |
| CN208316286U (en) * | 2018-06-29 | 2019-01-01 | 江苏集能易新能源技术有限公司 | A kind of photovoltaic switching off device bleeder circuit |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2014048459A1 (en) * | 2012-09-26 | 2014-04-03 | Siemens Aktiengesellschaft | Transducer arrangement for a photovoltaic system, and operating method for a photovoltaic system |
| CN204089183U (en) * | 2014-08-07 | 2015-01-07 | 广州海格通信集团股份有限公司 | A kind of can the Anti-surging mains switch protective circuit of frequent |
| CN108666978B (en) * | 2018-06-29 | 2024-02-02 | 江苏集能易新能源技术有限公司 | Voltage dividing circuit of photovoltaic turnoff device |
-
2018
- 2018-06-29 CN CN201810698469.5A patent/CN108666978B/en active Active
- 2018-11-12 WO PCT/CN2018/115019 patent/WO2020000863A1/en active Application Filing
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10136562A (en) * | 1996-10-31 | 1998-05-22 | Fujitsu Ltd | Power supply switch circuit |
| US20020027756A1 (en) * | 2000-08-18 | 2002-03-07 | Daniel Lopez | Battery-operated power supply unit |
| CN201061122Y (en) * | 2007-06-25 | 2008-05-14 | 深圳市麦格米特电气技术有限公司 | AC power-off fast closedown circuit |
| EP2439829A2 (en) * | 2010-10-08 | 2012-04-11 | VWL Umweltcentrum für Haustechnik | Assembly for secure deactivation of photovoltaic assemblies |
| CN103779829A (en) * | 2012-10-19 | 2014-05-07 | 鸿富锦精密工业（深圳）有限公司 | Load protection circuit |
| CN103001544A (en) * | 2012-11-14 | 2013-03-27 | 华为技术有限公司 | Photovoltaic generation system and control method thereof |
| CN208316286U (en) * | 2018-06-29 | 2019-01-01 | 江苏集能易新能源技术有限公司 | A kind of photovoltaic switching off device bleeder circuit |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2020000863A1 (en) * | 2018-06-29 | 2020-01-02 | 江苏集能易新能源技术有限公司 | Voltage dividing circuit for photovoltaic shutdown device |
| CN114050811A (en) * | 2022-01-13 | 2022-02-15 | 杭州禾迈电力电子股份有限公司 | Multi-input shutoff device, control method and photovoltaic power generation system |
Also Published As
| Publication number | Publication date |
|---|---|
| CN108666978B (en) | 2024-02-02 |
| WO2020000863A1 (en) | 2020-01-02 |
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