CN203350386U - Photovoltaic inverter multi-path input reverse-connection detection circuit with self-diagnosis function - Google Patents

Photovoltaic inverter multi-path input reverse-connection detection circuit with self-diagnosis function Download PDF

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Publication number
CN203350386U
CN203350386U CN 201320353455 CN201320353455U CN203350386U CN 203350386 U CN203350386 U CN 203350386U CN 201320353455 CN201320353455 CN 201320353455 CN 201320353455 U CN201320353455 U CN 201320353455U CN 203350386 U CN203350386 U CN 203350386U
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resistance
input
self
connection
multichannel
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朱军卫
徐剑峰
张俊
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SHANGHAI CHINT POWER SYSTEMS CO Ltd
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SHANGHAI CHINT POWER SYSTEMS CO Ltd
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Abstract

The utility model relates to a photovoltaic inverter multi-path input reverse-connection detection circuit with a self-diagnosis function, which comprises an optoelectronic coupler, a resistor R1, a resistor R2, a resistor R3 and a light emitting diode. In a multi-path independent solar cell input system, a control chip only needs to use one detection port to detect the reverse-connection state of any path in the multi-path solar cell inputs by using the circuit provided by the utility model. The port resources are saved. The cost is effectively reduced. The photovoltaic inverter multi-path input reverse-connection detection circuit can diagnose itself and judge whether it can work normally.

Description

Photovoltaic DC-to-AC converter multichannel input reverse-connection testing circuit with self-diagnostic function
Technical field
The utility model relates to and a kind of multichannel independent solar electric battery being connected in series into the circuit that carries out the reversal connection detection, belongs to photovoltaic DC-to-AC converter and detects the control technology field.
Background technology
Solar photovoltaic inverter is controlled for solar electrical energy generation is converted to alternating current and is connected to the grid, in use, if misoperation, can cause the reversal connection of solar cell input positive-negative polarity, the consequence caused in the inversion power generation process like this is, gently damages inverter, heavy produce strong spark discharge and burn cable, breaking out of fire, very easily cause any property loss and the generation of personal safety accident.And current existing testing circuit adopts A/D to read DC input voitage, perhaps input current, judge that by control chip the solar battery group string inputs whether reversal connection, like this each road independently the solar battery group string need a road voltage sample, current sample, an analog quantity input, complex structure, take the control chip interface resource many, cost is high.
Can't realize that the reverse connecting protection measure of multichannel independent battery access is not possessed to self-diagnostic function, have potential safety hazard.
Summary of the invention
The technical problems to be solved in the utility model is to make control chip only need use one to detect mouth, just can detect the reversal connection state on any road in the input of multichannel solar cell.
In order to solve the problems of the technologies described above, the technical solution of the utility model has been to provide a kind of multichannel of the photovoltaic DC-to-AC converter with self-diagnostic function input reverse-connection testing circuit, comprise photoelectrical coupler, resistance R 1, resistance R 2, resistance R 3 and light emitting diode, it is characterized in that: the input cathode series resistance R1 of photoelectrical coupler, resistance R 1 serial connection a plurality of the first diodes in parallel, each first diode connects the negative pole input of a road solar cell, the input negative pole serial connection light emitting diode of photoelectrical coupler, light emitting diode serial connection a plurality of the second diodes in parallel, each second diode connects the positive pole input of a road solar cell, wherein, the negative electrode contact resistance R1 of the first diode, the negative pole input of its anodic bonding solar cell, the input negative pole of the anodic bonding photoelectrical coupler of light emitting diode, its negative electrode connects the anode of the second diode, the negative electrode of the second diode connects the positive pole input of solar cell,
Cross-over connection resistance R 2 between the output of the emitter-base bandgap grading of photoelectrical coupler and collector output, the emitter-base bandgap grading of photoelectrical coupler is exported ground connection and is connected the earth terminal of control chip, its collector output connects the AD input end of control chip, and the AD input end of control chip connects voltage source Vcc via resistance R 3 simultaneously.
Preferably, described resistance R 1, resistance R 2 or the equivalent resistance of resistance R 3 for being in series by a plurality of resistance.
Preferably, the resistance of described resistance R 1 is 10000~1000000 ohm.
Preferably, the resistance of described resistance R 1 is 120000 ohm.
Preferably, the resistance of described resistance R 2 is 1000~200000 ohm.
Preferably, the resistance of described resistance R 2 is 15000 ohm.
Preferably, the resistance of described resistance R 3 is 1000~200000 ohm.
Preferably, the resistance of described resistance R 3 is 15000 ohm.
In multichannel independent solar battery input system, the circuit that uses the utility model to provide, control chip only need be used one to detect mouth, just can detect the reversal connection state on any road in the input of multichannel solar cell, can save interface resource, effectively reduce costs, and can whether can work by self diagnosis self.
The accompanying drawing explanation
The circuit diagram of a kind of multichannel of the photovoltaic DC-to-AC converter with self-diagnostic function input reverse-connection testing circuit that Fig. 1 provides for the utility model.
Embodiment
For the utility model is become apparent, hereby with preferred embodiment, and coordinate accompanying drawing to be described in detail below.
As shown in Figure 1, the utility model provides a kind of multichannel of the photovoltaic DC-to-AC converter with self-diagnostic function input reverse-connection testing circuit, comprise photoelectrical coupler U1, resistance R 1, resistance R 2, resistance R 3, LED 1, a plurality of the first diode D11, D12,, D1n and a plurality of the second diode D21, D22,, D2n.The model of LED 1 is 313-2SURD/S530-A3.The model of photoelectrical coupler U1 is LTV816S-D, its pin 1, input cathode series resistance R1, resistance R 1 serial connection a plurality of the first diodes in parallel, each first diode connects the negative pole input of a road solar cell, and the first diode D11 connects the negative pole input PV1-of solar cell, and the first diode D12 connects the negative pole input PV2-of solar cell,, the first diode D1n connects the negative pole input PVn-of solar cell.The pin 2 of photoelectrical coupler U1, input negative pole serial connection LED 1, a plurality of second diodes of light emitting diode serial connection LED1 parallel connection, each second diode connects the positive pole input of a road solar cell, the second diode D21 connects the positive pole input PV1+ of solar cell, the second diode D22 connects the positive pole input PV2+ of solar cell ..., the second diode D2n connects the positive pole input PVn+ of solar cell.Wherein, the negative electrode contact resistance R1 of the first diode, the negative pole input of its anodic bonding solar cell, the input negative pole of the anodic bonding photoelectrical coupler U1 of LED 1, its negative electrode connects the anode of the second diode, and the negative electrode of the second diode connects the positive pole input of solar cell;
Emitter-base bandgap grading output (being pin 3) and collector at photoelectrical coupler U1 are exported cross-over connection resistance R 2 between (being pin 4), the emitter-base bandgap grading of photoelectrical coupler U1 is exported ground connection and is connected the earth terminal of control chip, its collector output connects the AD input end of control chip, and the AD input end of control chip connects voltage source Vcc via resistance R 3 simultaneously.
Those skilled in the art can as required, replace resistance R 1, resistance R 2 or resistance R 3 with the resistance of a plurality of series connection.The resistance of resistance R 1 is 10000~1000000 ohm, is preferably 120000 ohm.The resistance of resistance R 2 is 1000~200000 ohm, is preferably 15000 ohm.The resistance of resistance R 3 is 1000~200000 ohm, is preferably 15000 ohm.
Principle of work of the present utility model is:
In the multichannel solar cell during any road reversal connection, can show by LED1, simultaneously, photoelectrical coupler U1 outputs signal to control chip by pin 4, the applied signal voltage of the AD end of control chip will change, control chip will be taked corresponding control measure, prevent the impact that the solar cell reversal connection causes.Line between resistance R 2 and resistance R 3 disconnects, and the applied signal voltage of the AD end of control chip also will change, and control chip also will send alarm, and the prompting cable disconnects, and plays the function of fault self-diagnosis.
Adopt optocoupler to detect more accurate.
The solar cell inverted connection detecting circuit that the utility model provides, circuit structure is simple, with low cost.
Finally should be noted that; above embodiment is only in order to illustrate the technical solution of the utility model; but not to the restriction of the utility model protection domain; although grin the utility model be explained in detail with reference to better enforcement; those of ordinary skill in the art is to be understood that; can modify or be equal to replacement the technical solution of the utility model, and not break away from essence and the scope of technical solutions of the utility model.

Claims (8)

1. the multichannel of the photovoltaic DC-to-AC converter with a self-diagnostic function input reverse-connection testing circuit, comprise photoelectrical coupler (U1), resistance R 1, resistance R 2, resistance R 3 and light emitting diode (LED1), it is characterized in that: the input cathode series resistance R1 of photoelectrical coupler (U1), resistance R 1 serial connection a plurality of the first diodes in parallel, each first diode connects the negative pole input of a road solar cell, the input negative pole serial connection light emitting diode (LED1) of photoelectrical coupler (U1), light emitting diode (LED1) serial connection a plurality of the second diodes in parallel, each second diode connects the positive pole input of a road solar cell, wherein, the negative electrode contact resistance R1 of the first diode, the negative pole input of its anodic bonding solar cell, the input negative pole of the anodic bonding photoelectrical coupler (U1) of light emitting diode (LED1), its negative electrode connects the anode of the second diode, the negative electrode of the second diode connects the positive pole input of solar cell,
Cross-over connection resistance R 2 between the output of the negative pole of photoelectrical coupler (U1) and anodal output, the negative pole of photoelectrical coupler (U1) is exported ground connection and is connected the earth terminal of control chip, its anodal output connects the AD input end of control chip, and the AD input end of control chip connects voltage source (Vcc) via resistance R 3 simultaneously.
2. a kind of multichannel of the photovoltaic DC-to-AC converter with self-diagnostic function input reverse-connection testing circuit as claimed in claim 1, is characterized in that: described resistance R 1, resistance R 2 or the equivalent resistance of resistance R 3 for being in series by a plurality of resistance.
3. a kind of multichannel of the photovoltaic DC-to-AC converter with self-diagnostic function input reverse-connection testing circuit as claimed in claim 1 or 2, it is characterized in that: the resistance of described resistance R 1 is 10000~1000000 ohm.
4. as claim 3 multichannel of the photovoltaic DC-to-AC converter with self-diagnostic function input reverse-connection testing circuit, it is characterized in that: the resistance of described resistance R 1 is 120000 ohm.
5. a kind of multichannel of the photovoltaic DC-to-AC converter with self-diagnostic function input reverse-connection testing circuit as claimed in claim 1 or 2, it is characterized in that: the resistance of described resistance R 2 is 1000~200000 ohm.
6. as claim 5 multichannel of the photovoltaic DC-to-AC converter with self-diagnostic function input reverse-connection testing circuit, it is characterized in that: the resistance of described resistance R 2 is 15000 ohm.
7. a kind of multichannel of the photovoltaic DC-to-AC converter with self-diagnostic function input reverse-connection testing circuit as claimed in claim 1 or 2, it is characterized in that: the resistance of described resistance R 3 is 1000~200000 ohm.
8. as claim 7 multichannel of the photovoltaic DC-to-AC converter with self-diagnostic function input reverse-connection testing circuit, it is characterized in that: the resistance of described resistance R 3 is 15000 ohm.
CN 201320353455 2013-06-19 2013-06-19 Photovoltaic inverter multi-path input reverse-connection detection circuit with self-diagnosis function Active CN203350386U (en)

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103323732A (en) * 2013-06-19 2013-09-25 上海正泰电源系统有限公司 Photovoltaic inverter multi-channel input reverse connection detection circuit with self-diagnostic function
US10097108B2 (en) 2014-12-16 2018-10-09 Abb Schweiz Ag Energy panel arrangement power dissipation
CN109546642A (en) * 2019-01-02 2019-03-29 阳光电源股份有限公司 A kind of inverter direct current input reverse-connection protective module and device
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 (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103323732A (en) * 2013-06-19 2013-09-25 上海正泰电源系统有限公司 Photovoltaic inverter multi-channel input reverse connection detection circuit with self-diagnostic function
CN103323732B (en) * 2013-06-19 2017-02-08 上海正泰电源系统有限公司 Photovoltaic inverter multi-channel input reverse connection detection circuit with self-diagnostic function
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
CN109546642A (en) * 2019-01-02 2019-03-29 阳光电源股份有限公司 A kind of inverter direct current input reverse-connection protective module and device

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