CN206272229U - For the reverse-connection preventing circuit of photovoltaic DC-to-AC converter direct current input side - Google Patents
For the reverse-connection preventing circuit of photovoltaic DC-to-AC converter direct current input side Download PDFInfo
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- CN206272229U CN206272229U CN201621354579.2U CN201621354579U CN206272229U CN 206272229 U CN206272229 U CN 206272229U CN 201621354579 U CN201621354579 U CN 201621354579U CN 206272229 U CN206272229 U CN 206272229U
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Abstract
The utility model proposes a kind of reverse-connection preventing circuit for photovoltaic DC-to-AC converter direct current input side, including：Continuous input cell, inversion unit, control unit, DC support electric capacity, protection location and the voltage sampling circuit electrically connected with control unit; on the circuit between continuous input cell and an input of inversion unit, DC support electric capacity is connected across between two inputs of inversion unit protection location；Protection location includes：The control end of first switch, pre-charge resistance and second switch, first switch and second switch is electrically connected with control unit respectively；The voltage sampling circuit sampled for the voltage to continuous input cell two ends is connected to the side of continuous input cell.It is used for the reverse-connection preventing circuit of photovoltaic DC-to-AC converter direct current input side in the utility model, had both realized photovoltaic DC-to-AC converter DC side counnter attack connection function, the DC support adjustable problem of electric capacity charging rate is realized again, while realizes the overvoltage/undervoltage defencive function of direct current input.
Description
Technical field
The utility model is related to reversal connection circuit field, particularly relates to a kind of counnter attack for photovoltaic DC-to-AC converter direct current input side
Connect circuit.
Background technology
Inverter is a kind of equipment for direct current energy being transformed into alternating current, is widely used in solar energy power generating system
The fields such as system, motor control.During inverter is connected with dc source, positive and negative electrode must connect correctly, can otherwise cause inverse
Become device short circuit to burn.To preventing DC terminal error-polarity connection from clearly requiring in relevant criterion：" inverter direct current is input into polarity
Energy automatic protection during misconnection ", the anti-reverse protection of several polarity relatively common at present has following several：
1) the direct series diode of photovoltaic DC-to-AC converter direct current input side, although this kind of method is simple, diode is just
It is larger to conducting pressure drop ratio, cause inverter efficiency to reduce, while with the raising of inverter power, anti-reverse diode needs
Install radiator additional, cause system bulk to increase.
2) the anti-reverse diode of photovoltaic DC-to-AC converter DC side is in parallel with relay or contactor, the normal work of inverter
Counnter attack diode is bypassed when making, although this kind of method eliminates the power attenuation of counnter attack diode, but because rear class supports electricity
There is very big charging current in the presence of appearance, direct current powered on moment, certain infringement can be caused to electric capacity, influence the electric capacity life-span；
Simultaneously because the presence of dc bus stray inductance, moment can produce very big peak voltage by a high current, it is possible to
Damage IGBT module.
3) a kind of Curve guide impeller for above-mentioned second scheme is one resistance of series connection at counnter attack diode, though so
Can so play a part of limit charging current, but the drawbacks of being still present certain, such as：During error-polarity connection, diode institute band
The leakage current for coming can still cause certain system loss；When polarity is correct, contactor or relay can be closed always, same meeting
Bring certain circuit loss；It is uncontrollable etc. for its precharge time of the inverter of different capacity.
Utility model content
The utility model proposes a kind of reverse-connection preventing circuit for photovoltaic DC-to-AC converter direct current input side, prior art is solved
Security that middle polarity reverse connection prevention protection circuit is present is not enough, service life is not high, the problems such as be lost excessive.
What the technical solution of the utility model was realized in：
A kind of reverse-connection preventing circuit for photovoltaic DC-to-AC converter direct current input side, including：Continuous input cell and direct current are input into
The inversion unit of unit electrical connection, control unit, DC support electric capacity C, protection location and the electricity that is electrically connected with control unit
Pressure sample circuit, protection location is located on the circuit between continuous input cell and an input of inversion unit, direct current branch
Support electric capacity C is connected across between two inputs of inversion unit；Protection location includes：First switch S1, pre-charge resistance R and
Two switch S2, first switch S1 and pre-charge resistance R are composed in series series circuit, and second switch S2 is in parallel with series circuit；The
The control end of one switch S1 and second switch S2 is electrically connected with control unit respectively；For the voltage to continuous input cell two ends
The voltage sampling circuit sampled is connected to the side of continuous input cell.
Used as further improvement of the utility model, first switch S1 and second switch S2 is relay or contactor.
The beneficial effects of the utility model are：
It is used for the reverse-connection preventing circuit of photovoltaic DC-to-AC converter direct current input side in the utility model, had both realized photovoltaic DC-to-AC converter straight
Stream side counnter attack connection function, realizes the DC support adjustable problem of electric capacity charging rate again, while realizing the mistake of direct current input
Under-voltage protection function.When mistake occurs in direct current input polarity, in the absence of the system loss brought by diode leakage current, energy-conservation
Effect is more obvious；The precharge time of DC support electric capacity can be adjusted according to its capacitance, it is to avoid high current occur
Situation；Simultaneously only in DC voltage in the voltage range of setting and when polarity is correct, second switch is just closed, so both
Relay or the contactor coil loss that zonula occludens comes always are reduced, the reliability of system is further improve；Due to
Voltage sampling circuit is connected to the side of continuous input cell, and only in the case of polarity is normal, DC master row just allows to connect
Enter Support Capacitor, so it is possible to prevente effectively from during error-polarity connection, the component damage and safe thing caused due to fault
Therefore problem.
Brief description of the drawings
In order to illustrate more clearly of the utility model embodiment or technical scheme of the prior art, below will be to embodiment
Or the accompanying drawing to be used needed for description of the prior art is briefly described, it should be apparent that, drawings in the following description are only
It is some embodiments of the present utility model, for those of ordinary skill in the art, before creative labor is not paid
Put, other accompanying drawings can also be obtained according to these accompanying drawings.
Fig. 1 be embodiment in for photovoltaic DC-to-AC converter direct current input side reverse-connection preventing circuit structural representation；
Fig. 2 be embodiment in for photovoltaic DC-to-AC converter direct current input side reverse-connection preventing circuit control flow chart.
Specific embodiment
Below in conjunction with the accompanying drawing in the utility model embodiment, the technical scheme in the utility model embodiment is carried out
Clearly and completely describe, it is clear that described embodiment is only a part of embodiment of the utility model, rather than whole
Embodiment.Based on the embodiment in the utility model, those of ordinary skill in the art are not under the premise of creative work is made
The every other embodiment for being obtained, belongs to the scope of the utility model protection.
As shown in figure 1, the structural representation of the reverse-connection preventing circuit to be used for photovoltaic DC-to-AC converter direct current input side in embodiment.
The reverse-connection preventing circuit for photovoltaic DC-to-AC converter direct current input side in embodiment, including：Continuous input cell and straight
The inversion unit of stream input block electrical connection, control unit, DC support electric capacity C, protection location and it is electrically connected with control unit
The voltage sampling circuit for connecing, protection location is located on the circuit between continuous input cell and an input of inversion unit,
DC support electric capacity is connected across between two inputs of inversion unit；Protection location includes：First switch S1, pre-charge resistance
R and second switch S2, first switch S1 and pre-charge resistance R are composed in series series circuit, and second switch S2 is with series circuit simultaneously
Connection；The control end of first switch S1 and second switch S2 is electrically connected with control unit respectively；For to continuous input cell two ends
The voltage sampling circuit sampled of voltage be connected to the side of continuous input cell, and sampled result is transmitted single to control
Unit.
First switch S1 and second switch S2 is relay or contactor in embodiment.
In above-described embodiment, continuous input cell comes from photovoltaic cell group string (header box) DC output side；The voltage
Sample circuit is by way of electric resistance partial pressure, DC voltage sampling to be carried out using sampling resistor and the parallel connection of DC support electric capacity,
It is prior art；The analog circuit that described control unit is made up of comparator, resistance, electric capacity, switching tube etc., including by
The line and functional circuit of polarity decision circuitry, under-voltage comparison circuit and overvoltage comparison circuit composition, time controllable relay (connect
Tentaculum) coil electricity circuit is prior art；First switch S1 is anti-reverse switch, second switch S2 in the protection location
Existing counnter attack connection function has overvoltage/undervoltage defencive function again.
As shown in Fig. 2 the control flow chart of the reverse-connection preventing circuit to be used for photovoltaic DC-to-AC converter direct current input side in embodiment.
It is used for the control method of the reverse-connection preventing circuit of photovoltaic DC-to-AC converter direct current input side, including following step in above-described embodiment
Suddenly：
Step one, the polarity of voltage that photovoltaic array is exported is judged by voltage sampling circuit, if polarity is correct,
First switch S1 is turned on, while being pre-charged to DC support electric capacity C by pre-charge resistance R, its charging interval can be by regulation
The parameter of relay (contactor) coil electricity circuit is adjusted；If incorrect polarity, first switch S1 can be constantly in disconnected
Open state, inversion unit does not start and alarms；
If step 2, the polarity of photovoltaic array output voltage are correct, and input voltage is in the normal voltage model of setting
In enclosing, second switch S2 conductings, inversion unit starts；If input voltage is below or above the lower limit of the startup voltage of setting
Or the upper limit, second switch S2 can be constantly in off-state, and inversion unit does not start and alarms.
It is used for the reverse-connection preventing circuit of photovoltaic DC-to-AC converter direct current input side in embodiment, had both realized photovoltaic DC-to-AC converter DC side
Counnter attack connection function, realizes the DC support adjustable problem of electric capacity charging rate again, while realizing the overvoltage/undervoltage of direct current input
Defencive function.When mistake occurs in direct current input polarity, in the absence of the system loss brought by diode leakage current, energy-saving effect
It is more obvious；The precharge time of DC support electric capacity can be adjusted according to its capacitance, it is to avoid the situation of high current occur,
It is provided simultaneously with the defencive function of overvoltage/undervoltage；Simultaneously only in DC voltage in the voltage range of setting and when polarity is correct,
Second switch S2 is just closed, and has so both reduced relay or the contactor coil loss that zonula occludens comes always, further
Improve the reliability of system；Only in the case of polarity is normal, DC master row just allows to access Support Capacitor, so can be with
When being prevented effectively from error-polarity connection, the component damage and security incident problem caused due to fault.
Preferred embodiment of the present utility model is the foregoing is only, is not used to limit the utility model, it is all at this
Within the spirit and principle of utility model, any modification, equivalent substitution and improvements made etc. should be included in the utility model
Protection domain within.
Claims (2)
1. a kind of reverse-connection preventing circuit for photovoltaic DC-to-AC converter direct current input side, it is characterised in that including：Continuous input cell,
The inversion unit that is electrically connected with the continuous input cell, control unit, DC support electric capacity C, protection location and with it is described
The voltage sampling circuit of control unit electrical connection, the protection location is located at the continuous input cell and the inversion unit
On circuit between one input, the DC support electric capacity C is connected across between two inputs of the inversion unit；Institute
Stating protection location includes：First switch S1, pre-charge resistance R and second switch S2, the first switch S1 and the precharge
Resistance R is composed in series series circuit, and the second switch S2 is in parallel with the series circuit；The first switch S1 and described
The control end of two switch S2 is electrically connected with described control unit respectively；Carried out for the voltage to the continuous input cell two ends
The voltage sampling circuit of sampling is connected to the side of the continuous input cell.
2. the reverse-connection preventing circuit for photovoltaic DC-to-AC converter direct current input side according to claim 1, it is characterised in that described
The first switch S1 and second switch S2 is relay or contactor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621354579.2U CN206272229U (en) | 2016-12-09 | 2016-12-09 | For the reverse-connection preventing circuit of photovoltaic DC-to-AC converter direct current input side |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621354579.2U CN206272229U (en) | 2016-12-09 | 2016-12-09 | For the reverse-connection preventing circuit of photovoltaic DC-to-AC converter direct current input side |
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| Publication Number | Publication Date |
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| CN206272229U true CN206272229U (en) | 2017-06-20 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201621354579.2U Active CN206272229U (en) | 2016-12-09 | 2016-12-09 | For the reverse-connection preventing circuit of photovoltaic DC-to-AC converter direct current input side |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109417286A (en) * | 2017-06-28 | 2019-03-01 | 深圳配天智能技术研究院有限公司 | A kind of detection circuit and servo-driver of servo-driver |
| CN109510450A (en) * | 2018-12-27 | 2019-03-22 | 阳光电源股份有限公司 | A kind of reverse connecting protection method and photovoltaic generating system |
| WO2020125343A1 (en) * | 2018-12-18 | 2020-06-25 | 华为技术有限公司 | Dc/dc conversion circuit |
| CN112003261A (en) * | 2020-09-18 | 2020-11-27 | 东莞新能安科技有限公司 | Reverse connection prevention protection circuit, method and electrochemical device |
-
2016
- 2016-12-09 CN CN201621354579.2U patent/CN206272229U/en active Active
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109417286A (en) * | 2017-06-28 | 2019-03-01 | 深圳配天智能技术研究院有限公司 | A kind of detection circuit and servo-driver of servo-driver |
| CN109417286B (en) * | 2017-06-28 | 2020-04-17 | 深圳配天智能技术研究院有限公司 | Detection circuit of servo driver and servo driver |
| WO2020125343A1 (en) * | 2018-12-18 | 2020-06-25 | 华为技术有限公司 | Dc/dc conversion circuit |
| US11811315B2 (en) | 2018-12-18 | 2023-11-07 | Huawei Digitial Power Technologies Co., Ltd. | DC/DC conversion circuit |
| CN109510450A (en) * | 2018-12-27 | 2019-03-22 | 阳光电源股份有限公司 | A kind of reverse connecting protection method and photovoltaic generating system |
| CN109510450B (en) * | 2018-12-27 | 2020-05-22 | 阳光电源股份有限公司 | Reverse connection protection method and photovoltaic power generation system |
| CN112003261A (en) * | 2020-09-18 | 2020-11-27 | 东莞新能安科技有限公司 | Reverse connection prevention protection circuit, method and electrochemical device |
| CN112003261B (en) * | 2020-09-18 | 2024-01-23 | 东莞新能安科技有限公司 | Reverse connection preventing protection circuit, reverse connection preventing protection method and electrochemical device |
| EP4199288A4 (en) * | 2020-09-18 | 2024-02-21 | Dongguan Poweramp Technology Limited | Anti-reverse connection protection circuit and method, and electrochemical apparatus and energy storage system |
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