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Charge discharge circuit, converter, centrifugal unit and electric appliance

A technology of charge discharge and converter, which is applied in the field of converters, can solve the problems of increased safety hazards, waste of residual charge, high equipment cabinets, etc., and achieve the effect of increasing safety performance and reducing temperature

Inactive Publication Date: 2021-02-26
GREE ELECTRIC APPLIANCES INC
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to overcome at least to a certain extent that the traditional bleeder circuit uses bleeder resistors to consume electric energy, resulting in a waste of residual charge, and when the bleeder resistor consumes electric energy, the electric energy is converted into heat energy, which will increase the internal temperature of the converter, especially When the converter is stopped and restarted in a short period of time, the high temperature in the equipment cabinet will increase the safety hazard. This application provides a charge discharge circuit, converter, centrifugal unit and electrical appliances

Method used

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  • Charge discharge circuit, converter, centrifugal unit and electric appliance
  • Charge discharge circuit, converter, centrifugal unit and electric appliance
  • Charge discharge circuit, converter, centrifugal unit and electric appliance

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Embodiment Construction

[0037]In order to make the purpose, technical solutions, and advantages of the present application clearer, the technical solutions of the present application will be described in detail below. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in this application, all other implementations obtained by a person of ordinary skill in the art without creative work shall fall within the scope of protection of this application.

[0038]figure 1 This is a schematic diagram of the structure of a charge bleeder circuit provided by an embodiment of this application, such asfigure 1 As shown, the charge discharge circuit includes:

[0039]Switching power supply 1 and contactor 2 connected in series with the switching power supply;

[0040]The switching power supply 1 and the contactor 2 are connected in parallel on both ends of the capacitor of the bus 3 to be discharged.

[0041]In some embodiments...

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Abstract

The invention relates to a charge discharge circuit, a converter, a centrifugal unit and an electric appliance. The charge discharge circuit comprises a switching power supply and a contactor connected with the switching power supply in series, wherein the switching power supply and the contactor are connected in parallel to two ends of a to-be-discharged bus capacitor. According to the invention,the bus residual charge can be safely discharged when the contactor is closed, the internal temperature of the equipment is reduced, the starting frequency of the equipment is not limited, and the safety performance of the equipment is improved.

Description

Technical field[0001]This application belongs to the technical field of converters, and specifically relates to a charge discharge circuit, a converter, a centrifugal unit and an electrical appliance.Background technique[0002]When the converter is working, a higher voltage is established on the DC bus. When the converter stops, there is a large amount of residual charge on the bus. If the charge cannot be discharged quickly, there will be a safety hazard. The main topology of the converter for high-power variable-frequency centrifugal units usually adopts the "AC-DC-AC" structure, that is, the input is AC, the DC potential is established through the rectifier module, and then the DC power is converted into a suitable AC power through the inverter module. The rectifier module and the inverter module are connected through a DC bus, and a larger capacitor is connected to the DC bus for energy storage. The current scheme for venting the residual charge of the DC bus is to achieve this f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M1/32H02M5/42
CPCH02M1/32H02M5/42H02M1/322
Inventor 党培育姜颖异黄猛黄颂儒徐志国
Owner GREE ELECTRIC APPLIANCES INC
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