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DC bus overvoltage protection circuit, frequency converter and air conditioner

A technology of overvoltage protection circuit and DC bus, which is applied in the fields of frequency converters, air conditioners, and DC bus overvoltage protection circuits. It can solve the problems of high application cost and complex circuit structure of overvoltage protection circuits, and achieve low cost and simple structure. , the effect of less devices

Pending Publication Date: 2019-10-25
GREE ELECTRIC APPLIANCES INC OF ZHUHAI
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Problems solved by technology

[0004] In order to solve the technical problems of complex circuit structure and high application cost of the overvoltage protection circuit in the prior art, the present invention proposes a DC bus overvoltage protection circuit, frequency converter and air conditioner

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  • DC bus overvoltage protection circuit, frequency converter and air conditioner

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Embodiment Construction

[0024] The principles and embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0025] Aiming at the problems of complex circuit structure and high application cost in the overvoltage protection circuit, the present invention proposes a DC bus overvoltage protection circuit, which includes a bypass circuit connected between the positive and negative DC buses. The pass circuit includes a bypass switch and a detection module; the bypass switch is connected between the positive and negative DC busbars, and is used to discharge current to reduce the busbar voltage; the detection module is used to detect the busbar voltage, when the busbar When the voltage exceeds the threshold, the bypass switch is controlled to be turned on.

[0026] As a high-power switching semiconductor device, the thyristor is low in cost and widely used. The thyristor can work under the condition of high voltage and high current. The present ...

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Abstract

The invention discloses a DC bus overvoltage protection circuit, a frequency converter and an air conditioner. The DC bus overvoltage protection circuit comprises a bypass circuit connected between anode and cathode DC buses and used to bleed a current to reduce the bus voltage, the bypass circuit comprises a bypass switch and a detection module, and the detection module is used to detect the busvoltage, and switches on a bypass switch when the bus voltage exceeds a threshold. A thyristor serves as the bypass switch by utilizing the characteristic that the thyristor can work under high voltage and heavy current, the risk that too high voltage damages a main loop is reduced effectively, and the DC bus is protected against overvoltage.

Description

technical field [0001] The invention relates to the field of circuit protection, in particular to a DC bus overvoltage protection circuit, a frequency converter and an air conditioner. Background technique [0002] With the development of society, electrical equipment is widely used in industrial production. Due to the complex industrial production environment, electrical equipment often cannot work normally or even be damaged due to external interference. Among them, high-voltage shock is a relatively common interference, and electrical equipment is easily damaged under high-voltage shock. Therefore, the overvoltage protection of electrical equipment is particularly important. At this stage, people have proposed many measures for overvoltage protection and invented many overvoltage protection circuits, but most of them have problems such as complex circuit structure and high application cost. [0003] Therefore, how to solve the complicated circuit structure and high appli...

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Application Information

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IPC IPC(8): H02H9/04
CPCH02H9/041
Inventor 庄网发李东涛贺小林杨帆刘文斌黄伟
Owner GREE ELECTRIC APPLIANCES INC OF ZHUHAI
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