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PV positive and negative reverse connection inverter automatic switching circuit

An automatic switching, inverter technology, applied in circuits, emergency protection circuit devices, relays, etc., can solve the problems of inability to automatically switch normal state relays, fragile relays, etc.

Pending Publication Date: 2021-03-16
SHANGHAI CHINT POWER SYST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is: the existing PV positive and negative reverse connection detection usually can only issue an alarm, and cannot automatically switch to a normal state or the problem that the relay contact is easily damaged by arcing during switching

Method used

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  • PV positive and negative reverse connection inverter automatic switching circuit
  • PV positive and negative reverse connection inverter automatic switching circuit
  • PV positive and negative reverse connection inverter automatic switching circuit

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Embodiment Construction

[0019] In order to make the present invention more comprehensible, preferred embodiments are described in detail below with accompanying drawings.

[0020] Take the application of the present invention in a photovoltaic system as an example to illustrate below, as figure 2 As shown, the present invention provides a positive and negative terminal connection adaptive circuit of a solar panel, including a photovoltaic panel assembly, a photovoltaic shutdown box S1 and an inverter, and the inverter includes an inverter CPU, a magnetic latching relay K1 and The magnetic latching relay drive circuit, the photovoltaic panel assembly is connected to the inverter CPU through the photovoltaic shutdown box S1, and the inverter CPU is connected to the magnetic latching relay K1 through the magnetic latching relay drive circuit.

[0021] The magnetic latching relay drive circuit includes resistor R1, resistor R2, resistor R3, resistor R4, resistor R5, resistor R6, resistor R7, resistor R8...

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Abstract

The invention discloses a PV positive and negative reverse connection inverter automatic switching circuit which is characterized in that the PV positive and negative reverse connection inverter automatic switching circuit comprises a cell panel assembly, a turn-off box and an inverter, the inverter comprises an inverter CPU, a magnetic latching relay K1 and a magnetic latching relay drive circuit, the cell panel assembly is connected with the inverter through the turn-off box, the inverter CPU is connected with the magnetic latching relay K1 through the magnetic latching relay drive circuit,the inverter CPU is used for detecting whether reverse connection occurs in the battery panel assembly or not so as to control the main loop to be disconnected or powered on through the turn-off box,and the magnetic latching relay K1 is controlled to complete switching of the opening and closing states and keep the switching, so that automatic switching of the inverter is realized. According to the invention, the inverter can automatically switch the non-stop PV positive and negative polarities of the grid-connected inverter system under the condition of photovoltaic direct-current side inputreverse connection, unsafe factors generated by manual live switching are avoided, the function of automatic zero-current switching of the positive and negative electrodes of the inverter is realized, and the power consumption of the relay is also extremely low.

Description

technical field [0001] The invention relates to an automatic switching circuit of a PV positive and negative reverse connection inverter, which belongs to the field of photovoltaic power generation related equipment. Background technique [0002] The photovoltaic industry is developing rapidly in the world, the scale of the photovoltaic industry is constantly expanding, and the overall trend of the industry is on the rise. With the further development of the photovoltaic industry, it is expected that the global photovoltaic industry market will be further developed in the next few years. In the application of photovoltaic power generation system, multiple strings are often connected in parallel to improve power. The output of the photovoltaic panel is divided into positive and negative poles. During the installation of the string photovoltaic panels in the power station, if the installer improperly operates, it is easy to reverse the positive and negative poles of the solar...

Claims

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Application Information

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IPC IPC(8): H02H11/00H02H7/20H02S40/30H01H47/00H01H47/02
CPCH01H47/00H01H47/002H01H47/02H02H7/20H02H11/002H02S40/30Y02E10/50
Inventor 朱京涛杨剑平张玉林
Owner SHANGHAI CHINT POWER SYST