CN208386135U - A kind of photovoltaic switching off device tandem drive circuit - Google Patents
A kind of photovoltaic switching off device tandem drive circuit Download PDFInfo
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- CN208386135U CN208386135U CN201821020235.7U CN201821020235U CN208386135U CN 208386135 U CN208386135 U CN 208386135U CN 201821020235 U CN201821020235 U CN 201821020235U CN 208386135 U CN208386135 U CN 208386135U
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Abstract
The utility model discloses a kind of photovoltaic switching off device tandem drive circuits, including photovoltaic module VPV, input capacitance C4 and control unit；The input capacitance C4 and photovoltaic module VPV is connected in parallel, and the anode of the photovoltaic module VPV is connect with first lead-out terminal 1-1, and the cathode of the photovoltaic module VPV is connected by the switching tube of two series connections with the sub- 1-2 of second output terminal；The switching tube of described two series connections is connected with described control unit；One end of the output capacitance C5 connects first lead-out terminal, the other end connection second output terminal of the output capacitance C5；The both ends of the output capacitance C5 are connected in parallel to sustained diode 1 and output resistance R1.The utility model effectively improves system reliability, High voltage output will not occurs because of single switching transistor, avoid personal safety hidden danger, and at low cost, high reliablity.
Description
Technical field
The utility model relates to a kind of photovoltaic circuit more particularly to a kind of photovoltaic switching off device tandem drive circuits, belong to electricity
Power electronic converter technical field.
Background technique
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 mentioned
Go out and has been distinctly claimed.It will be started formally execution on January 1st, 2019.NEC 2017 is provided: " except group string, controller installation
In the range of being more than 1 meter within 0.3 meter of distance arrays and apart from access point, after rapidly switching off, system needs 30 seconds
Inside it is down to 30V；Within group string, it is down to 80V in 30 seconds, conveniently takes safe rescue measure."
Utility model content
The technical problem to be solved by the utility model is to provide a kind of photovoltaic switching off device tandem drive circuits, it is ensured that
The safety of system, at low cost, high reliablity is easy to implement, meets Code of Federal Regulations and rapidly switches off safety requirements.
The utility model is to solve above-mentioned technical problem and the technical solution adopted is that provide a kind of photovoltaic switching off device series connection
Driving circuit, including photovoltaic module VPV, input capacitance C4 and control unit；The input capacitance C4 is in parallel with photovoltaic module VPV
The anode of connection, the photovoltaic module VPV is connect with first lead-out terminal 1-1, and the cathode of the photovoltaic module VPV passes through two
The switching tube of series connection is connected with the sub- 1-2 of second output terminal；The switching tube and described control unit of described two series connections
It is connected；One end of the output capacitance C5 connects first lead-out terminal, the second output of other end connection of the output capacitance C5
Terminal；The both ends of the output capacitance C5 are connected in parallel to sustained diode 1 and output resistance R1.
Above-mentioned photovoltaic switching off device tandem drive circuit, wherein the switching tube of described two series connections is first switch
Pipe Q1 and second switch Q2, the cathode of the photovoltaic module VPV are connected with the drain electrode of first switch tube Q1, the first switch
The drain electrode of the source electrode and second switch Q2 of pipe Q1 is connected together to form MID driving end；The source electrode of the second switch Q2
It is connected with the sub- 1-2 of second output terminal；The base stage of the first switch tube Q1 passes through the first driving circuit and described control unit phase
Even, the base stage of the second switch Q2 is connected by the second driving circuit with described control unit.
Above-mentioned photovoltaic switching off device tandem drive circuit, wherein first driving circuit includes switching tube Q4, switching tube
Q3 and switching tube Q5；The switching tube Q4 emitter is connected with VCC voltage end, connects between the switching tube Q4 emitter and base stage
It is connected to resistance R2；The switching tube Q4 base stage is connected by resistance R3 with the collector of switching tube Q3；The hair of the switching tube Q3
Emitter grounding, the base stage of the switching tube Q3 by resistance R4 with and described control unit be connected；The current collection of the switching tube Q4
It is connected after the series resistor R5 of pole with the anode of diode D2；The base stage of the cathode of the diode D2 and first switch tube Q1 are opened
The emitter for closing pipe Q5 is connected；The base stage of the grounded collector of the switching tube Q5, the switching tube Q5 is grounded by resistance R6.
Above-mentioned photovoltaic switching off device tandem drive circuit, wherein second driving circuit includes switching tube Q6, switching tube
Q7 and switching tube Q8；It is connected after the switching tube Q6 emitter series diode D4 with VCC voltage end, the switching tube Q6 transmitting
Resistance R7 is connected between pole and base stage；The switching tube Q6 base stage is connected by resistance R8 with the collector of switching tube Q7；Institute
The emitter for stating switching tube Q7 is connected with MID driving end, and the base stage of the switching tube Q7 is connected with the cathode of diode D5；It is described
The anode of diode D5 by resistance R11 with and described control unit be connected；The collector series connection resistance R9 of the switching tube Q6
It is connected afterwards with the anode of diode D3；The transmitting of the base stage, switching tube Q8 of the cathode and second switch Q2 of the diode D3
Extremely it is connected；The collector of the switching tube Q8 is connected with MID driving end, connects between the collector and base stage of the switching tube Q8
There is resistance R10.
The utility model comparison prior art has following the utility model has the advantages that photovoltaic switching off device series connection provided by the utility model
Driving circuit can effectively improve system reliability, will not because of single switching transistor damage and there is High voltage output, avoid
Personal safety hidden danger is caused, safety is good, high reliablity, and at low cost, high-efficient.
Detailed description of the invention
Fig. 1 is one of the utility model embodiment photovoltaic switching off device tandem drive circuit diagram；
Fig. 2 is the drive circuit schematic diagram of the first switch tube Q1 of the photovoltaic switching off device in the utility model embodiment；
Fig. 3 is the drive circuit schematic diagram of the second switch Q2 of the photovoltaic switching off device in the utility model embodiment；
Fig. 4 is photovoltaic switching off device tandem drive circuit and control unit connection schematic diagram in the utility model embodiment.
Specific embodiment
One of the utility model embodiment photovoltaic switching off device tandem drive circuit, safety is good, at low cost, reliability
It is good.
It is understandable to enable the above-mentioned purpose, feature and beneficial effect of the utility model to become apparent, with reference to the accompanying drawing
The specific example of the utility model is described in detail.
Referring to FIG. 1, photovoltaic switching off device tandem drive circuit provided by the utility model, including photovoltaic module VPV, input
Capacitor C4 and control unit；The input capacitance C4 and photovoltaic module VPV is connected in parallel, the photovoltaic module VPV anode with
First lead-out terminal 1-1 connection, the switching tube and second output terminal that the cathode of the photovoltaic module VPV passes through two series connections
Sub- 1-2 is connected；The switching tube of described two series connections is connected with described control unit；One end of the output capacitance C5 connects
First lead-out terminal, the other end connection second output terminal of the output capacitance C5；The both ends of the output capacitance C5 are in parallel
It is connected with sustained diode 1 and output resistance R1.
Photovoltaic switching off device tandem drive circuit provided by the utility model, the switching tube being connected in series using two are driven
It is dynamic, the reliability and safety of system is greatly improved, it will not be in the case where switching off device turns off, because single tube failure causes to export
There is high pressure appearance；When there is fire, the life security of fire fighter will not be influenced because of system high pressure.
Preferably, the switching tube of two series connections is respectively first switch tube Q1 and second switch Q2, photovoltaic module
The cathode of VPV is connected with the drain electrode of first switch tube Q1, and the source electrode of first switch tube Q1 is connected with the drain electrode of second switch Q2
MID is formed together drives end；The source electrode of second switch Q2 is connected with the sub- 1-2 of second output terminal；The base of first switch tube Q1
Pole is connected by the first driving circuit with described control unit, and the base stage of second switch Q2 passes through the second driving circuit and described
Control unit is connected.
Continuing with referring to fig. 2, first driving circuit of the utility model includes switching tube Q4, switching tube Q3 and switching tube
Q5；The switching tube Q4 emitter is connected with VCC voltage end, is connected with resistance between the switching tube Q4 emitter and base stage
R2；The switching tube Q4 base stage is connected by resistance R3 with the collector of switching tube Q3；The emitter of the switching tube Q3 is grounded,
The base stage of the switching tube Q3 by resistance R4 with and described control unit be connected；The collector series connection resistance of the switching tube Q4
It is connected after R5 with the anode of diode D2；The cathode of the diode D2 and the base stage of first switch tube Q1, the hair of switching tube Q5
Emitter-base bandgap grading is connected；The base stage of the grounded collector of the switching tube Q5, the switching tube Q5 is grounded by resistance R6.
Continuing with referring to Fig. 3, second driving circuit of the utility model is mainly by switching tube Q6, switching tube Q7 and switching tube
The discrete components such as Q8 are built, only several triodes, diode, and resistance can complete driving, and structure is simple, does not need
It is at low cost using special suspended power supply driving chip, it is high-efficient.First driving circuit and the second driving circuit are essentially the same,
First driving circuit has lacked diode D4, D5.Wherein, Q2, Q3, Q4 are NPN triode, and Q5, Q6 are PNP triode.Second drives
Dynamic circuit concrete composition connection is as follows: VCC voltage end, which is contacted, to be connected after diode D4 with switching tube Q6 emitter, resistance R7 with open
It closes pipe Q6 emitter and base stage is in parallel；The switching tube Q6 base stage is connected with the one end resistance R7, and other end is with switching tube Q7's
Collector is connected；The emitter of the switching tube Q7 is connected with MID driving end, and base stage is connected with the cathode of diode D5；It is described
The anode of diode D5 is connected with the one end resistance R11；The other end of the resistance R11 is connected with control signal PA1；It is described to open
It is connected after closing pipe Q6 collector string resistance R9 with the anode of diode D3；The cathode and switching tube Q2 base stage of the diode D3,
The emitter of switching tube Q8 is connected；The switching tube Q8 collector and MID driving end are connected, emitter and base stage and diode D3
It is in parallel；The resistance R10 mono- terminates switching tube base stage, and other end is connected with MID driving end.
The photovoltaic switching off device tandem drive circuit of the utility model is connect as shown in figure 4, working as first switch with control unit
For pipe Q1 or second switch Q2 because when a variety of causes short circuit, photovoltaic module and bus can be cut off by closing a switching tube
Connection, no output high pressure；When there is fire, switching off device does not receive signal, and it is all low electricity that control unit, which exports PA0 and PA1,
Flat, switching tube Q3 and Q7 cut-off, switching tube Q4 and Q6 is without base current, and collector cut-off, emitter is without output；Work as first switch
When pipe Q1 and second switch Q2 level are higher than switching tube Q4 and Q6 emitter voltage, switching tube Q5 and Q8 conducting, first switch
Pipe Q1 and the electric discharge of second switch Q2 base stage, first switch tube Q1 and second switch Q2 cut-off, first lead-out terminal 1-1 and the
Voltage between two output terminal 1-2 is less than 1V.
Photovoltaic switching off device tandem drive circuit provided by the utility model, safety is good, high reliablity；And at low cost, effect
Rate is high.The utility model can effectively improve system reliability, will not because single switching transistor (Q1) or (Q2) damage and
There is High voltage output, avoids personal safety hidden danger.The drain electrode of second switch Q2 is not connected to the ground, but is opened with first
The source electrode for closing pipe Q1 is connected, therefore second switch Q2 needs the driving that suspends, and second switch Q2 driving circuit is only than common
Driving circuit increases by two diodes, at low cost, high reliablity.
Although the utility model is disclosed as above with preferred embodiment, so it is not intended to limit the utility model, any
Those skilled in the art, without departing from the spirit and scope of the utility model, when can make a little modification and it is perfect, therefore this
The protection scope of utility model, which is worked as, to be subjected to the definition of the claims.
Claims (4)
1. a kind of photovoltaic switching off device tandem drive circuit characterized by comprising
Photovoltaic module VPV, input capacitance C4, output capacitance C5 and control unit；
The input capacitance C4 and photovoltaic module VPV is connected in parallel, anode and the first lead-out terminal 1- of the photovoltaic module VPV
The cathode of 1 connection, the photovoltaic module VPV is connected by the switching tube of two series connections with the sub- 1-2 of second output terminal；It is described
The switching tube of two series connections is connected with described control unit；
One end of the output capacitance C5 connects first lead-out terminal, and the other end of the output capacitance C5 connects second output terminal
Son；The both ends of the output capacitance C5 are connected in parallel to sustained diode 1 and output resistance R1.
2. photovoltaic switching off device tandem drive circuit according to claim 1, which is characterized in that described two series connections
Switching tube is the drain electrode of the cathode and first switch tube Q1 of first switch tube Q1 and second switch Q2, the photovoltaic module VPV
It is connected, the drain electrode of the source electrode and second switch Q2 of the first switch tube Q1 is connected together to form MID driving end；Described
The source electrode of two switching tube Q2 is connected with the sub- 1-2 of second output terminal；The base stage of the first switch tube Q1 passes through the first driving circuit
It is connected with described control unit, the base stage of the second switch Q2 is connected by the second driving circuit with described control unit.
3. photovoltaic switching off device tandem drive circuit according to claim 2, which is characterized in that the first driving circuit packet
Include switching tube Q4, switching tube Q3 and switching tube Q5；The switching tube Q4 emitter is connected with VCC voltage end, the switching tube Q4
Resistance R2 is connected between emitter and base stage；The switching tube Q4 base stage passes through the collector phase of resistance R3 and switching tube Q3
Even；The emitter of the switching tube Q3 is grounded, the base stage of the switching tube Q3 by resistance R4 with and described control unit be connected；
It is connected after the collector series connection resistance R5 of the switching tube Q4 with the anode of diode D2；The cathode and first of the diode D2
The base stage of switching tube Q1, the emitter of switching tube Q5 are connected；The grounded collector of the switching tube Q5, the base of the switching tube Q5
Pole is grounded by resistance R6.
4. photovoltaic switching off device tandem drive circuit according to claim 2, which is characterized in that the second driving circuit packet
Include switching tube Q6, switching tube Q7 and switching tube Q8；After the switching tube Q6 emitter series diode D4 with VCC voltage end phase
Even, resistance R7 is connected between the switching tube Q6 emitter and base stage；The switching tube Q6 base stage passes through resistance R8 and switch
The collector of pipe Q7 is connected；The emitter of the switching tube Q7 is connected with MID driving end, the base stage of the switching tube Q7 and two poles
The cathode of pipe D5 is connected；The anode of the diode D5 by resistance R11 with and described control unit be connected；The switching tube Q6
Collector series connection resistance R9 after be connected with the anode of diode D3；The cathode of the diode D3 and the base of second switch Q2
Pole, the emitter of switching tube Q8 are connected；The collector of the switching tube Q8 is connected with MID driving end, the collection of the switching tube Q8
Resistance R10 is connected between electrode and base stage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821020235.7U CN208386135U (en) | 2018-06-29 | 2018-06-29 | A kind of photovoltaic switching off device tandem drive circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821020235.7U CN208386135U (en) | 2018-06-29 | 2018-06-29 | A kind of photovoltaic switching off device tandem drive circuit |
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| CN208386135U true CN208386135U (en) | 2019-01-15 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108666977A (en) * | 2018-06-29 | 2018-10-16 | 江苏集能易新能源技术有限公司 | A kind of photovoltaic switching off device tandem drive circuit |
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2018
- 2018-06-29 CN CN201821020235.7U patent/CN208386135U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108666977A (en) * | 2018-06-29 | 2018-10-16 | 江苏集能易新能源技术有限公司 | A kind of photovoltaic switching off device tandem drive circuit |
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