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Photovoltaic inverter multi-channel input reverse connection detection circuit with self-diagnostic function

A photovoltaic inverter, multi-channel input technology, applied in the direction of measuring electricity, instruments, measuring devices, etc., can solve potential safety hazards, do not have self-diagnosis function, and cannot realize reverse connection protection measures for multi-channel independent battery access and other issues to achieve the effect of saving interface resources and reducing costs

Active Publication Date: 2013-09-25
SHANGHAI CHINT POWER SYST
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0003] Unable to implement reverse connection protection measures for multiple independent battery access, does not have self-diagnosis function, and has potential safety hazards

Method used

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  • Photovoltaic inverter multi-channel input reverse connection detection circuit with self-diagnostic function

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Embodiment Construction

[0016] In order to make the present invention more comprehensible, preferred embodiments are described in detail below with accompanying drawings.

[0017] Such as figure 1 As shown, the present invention provides a photovoltaic inverter multi-channel input reverse connection detection circuit with a self-diagnostic function, including a photocoupler U1, a resistor R1, a resistor R2, a resistor R3, a light-emitting diode LED1, a plurality of first and second Diodes D11, D12, ..., D1n and a plurality of second diodes D21, D22, ..., D2n. The model of the light-emitting diode LED1 is 313-2SURD / S530-A3. The model of photocoupler U1 is LTV816S-D, its pin 1, that is, the input positive pole is connected in series with resistor R1, resistor R1 is connected in series with multiple first diodes in parallel, and each first diode is connected to a solar cell. Negative input, that is, the first diode D11 is connected to the negative input PV1- of the solar cell, the first diode D12 is c...

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Abstract

The invention relates to a photovoltaic inverter multi-channel input reverse connection detection circuit with the self-diagnostic function. The photovoltaic inverter multi-channel input reverse connection detection circuit with the self-diagnostic function comprises a photoelectric coupler, a resistor R1, a resistor R2, a resistor R3 and a light emitting diode. In a multi-channel independent solar cell input system, through the photovoltaic inverter multi-channel input reverse connection detection circuit, just one detection port needs to be used by a control chip so that the reverse connection state of any channel of multi-channel solar cell input, the resource of connectors is saved, cost is lowered effectively, and the photovoltaic inverter multi-channel input reverse connection detection circuit can diagnose whether normal work can be carried out in a self-diagnostic mode.

Description

technical field [0001] The invention relates to a circuit for performing reverse connection detection on the connection of multiple independent solar battery strings, and belongs to the technical field of detection and control of photovoltaic inverters. Background technique [0002] The solar photovoltaic inverter control is used to convert solar power into alternating current and incorporate it into the grid. During use, if the operation is improper, it will cause the positive and negative polarities of the solar battery input to be reversed, so that the consequences during the inverter power generation process are , In the slightest, the inverter will be damaged, and in severe cases, a strong spark discharge will burn the cable, and a fire will occur, which will easily cause property loss and personal safety accidents. At present, the existing detection circuit uses A / D to read the DC input voltage or input current, and judges whether the input of the solar battery string ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/02
Inventor 朱军卫徐剑峰张俊
Owner SHANGHAI CHINT POWER SYST
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