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Anti-reverse connection circuit, control method, photovoltaic power supply system and photovoltaic air conditioner

An anti-reverse connection circuit and power supply system technology, which is applied in the fields of control methods, anti-reverse connection circuits, photovoltaic power supply systems and photovoltaic air conditioners, can solve the problems of low safety and high cost of anti-reverse connection solutions, and achieve improved safety and energy saving cost effect

Pending Publication Date: 2021-11-30
GREE ELECTRIC APPLIANCES INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] An embodiment of the present invention provides an anti-reverse connection circuit, a control method, a photovoltaic power supply system, and a photovoltaic air conditioner to solve the problems of high cost and low safety of the anti-reverse connection scheme for photovoltaic strings in the prior art

Method used

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  • Anti-reverse connection circuit, control method, photovoltaic power supply system and photovoltaic air conditioner
  • Anti-reverse connection circuit, control method, photovoltaic power supply system and photovoltaic air conditioner
  • Anti-reverse connection circuit, control method, photovoltaic power supply system and photovoltaic air conditioner

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Embodiment 1

[0057] This embodiment provides an anti-reverse connection circuit, which is applied to a photovoltaic power supply system. figure 1 It is a structural diagram of an anti-reverse connection circuit according to an embodiment of the present invention, such as figure 1 As shown, the anti-reverse connection circuit includes a resistance sampling module 10, a logic judgment module 20, and a controller 30 connected in sequence;

[0058] The resistance sampling module 10, whose input end is connected to the interface between the photovoltaic string and the frequency converter, is used to collect the positive voltage and negative voltage at the interface, and generate sampling signals based on the positive voltage and negative voltage at the interface; logic judgment The module 20, whose input end is connected to the resistance sampling module 10, is used to generate a control signal according to the sampling signal; the controller 30, whose input end is connected to the logic judgme...

Embodiment 2

[0062] This embodiment provides another anti-reverse connection circuit, figure 2 It is a structural diagram of an anti-reverse connection circuit according to another embodiment of the present invention. The positive voltage and the negative voltage at the interface between the photovoltaic string and the frequency converter are relatively large DC voltages, which are directly input into the logic judgment module 20 of the subsequent stage, which will cause The input voltage of logic judgment module 20 is too large, in order to solve this problem, as figure 2 As shown, the resistance sampling module 10 includes: a first sampling unit 101, the input end of which is connected to the positive terminal at the interface between the photovoltaic string and the frequency converter, for collecting the positive voltage at the interface between the photovoltaic string and the frequency converter, and Generate the first sampled signal; as figure 2 As shown, the first sampling unit 1...

Embodiment 3

[0078] This embodiment provides a photovoltaic power supply system, including a photovoltaic string and a frequency converter. The photovoltaic power supply system further includes the anti-reverse connection circuit in the above embodiment, which is used to reduce costs and improve system security.

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Abstract

The invention discloses an anti-reverse connection circuit, a control method, a photovoltaic power supply system and a photovoltaic air conditioner. The anti-reverse connection circuit comprises a resistance sampling module, a logic judgment module and a controller which are connected in sequence, wherein the resistance sampling module is connected to an interface of a photovoltaic string and a frequency converter, and is used for collecting positive voltage and negative voltage at the interface and generating a sampling signal based on the positive voltage and the negative voltage; the logic judgment module is used for generating a control signal according to the sampling signal; and the controller is used for controlling the on-off of the frequency converter according to the control signal. A voltage sensor can be prevented from being used for voltage sampling, the cost is saved, meanwhile, after reverse connection, the controller can cut off the power supply of the frequency converter in time, and the safety is improved.

Description

technical field [0001] The invention relates to the technical field of electronic power, in particular to an anti-reverse connection circuit, a control method, a photovoltaic power supply system and a photovoltaic air conditioner. Background technique [0002] In the photovoltaic power supply system, the photovoltaic strings need to be connected to the DC bus of the inverter, but the positive and negative terminals of the photovoltaic strings may be reversed. If reversed, it will cause a short circuit and cause great damage to the inverter. Therefore, Reverse connection detection must be performed on the interface between the PV string and the inverter. The current reverse connection detection scheme generally uses a voltage sensor to detect whether the connection is reversed, which is costly, and can only detect the abnormality of the reverse connection, but cannot directly deal with the abnormality of the reverse connection, resulting in untimely disposal and affecting the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H11/00H02S40/34H02S40/30H02M1/00G01R27/02
CPCH02H11/002H02S40/34H02S40/30H02M1/00G01R27/02Y02E10/56
Inventor 李光一姜颖异黄猛徐志国宋春阳
Owner GREE ELECTRIC APPLIANCES INC
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