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Residual charge bleeder circuit, converter and air conditioner

A technology of residual charge and discharge circuit, which is applied in the field of converters and air conditioners, and the field of residual charge discharge circuit, which can solve problems such as heat insecurity, and achieve the effects of increasing safety performance, reducing temperature, and safely discharging

Inactive Publication Date: 2019-02-19
GREE ELECTRIC APPLIANCES INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the defect in the prior art that the heat is too high and unsafe during the discharge process of the residual charge of the DC bus, the present invention proposes a discharge circuit that can reduce the internal temperature of the converter

Method used

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  • Residual charge bleeder circuit, converter and air conditioner
  • Residual charge bleeder circuit, converter and air conditioner
  • Residual charge bleeder circuit, converter and air conditioner

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Embodiment Construction

[0020] In order to make the object, technical solution and advantages of the present invention more clear, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0021] Many equipment that use DC bus for power transmission have residual charges on the DC bus when the equipment stops running. These residual charges need to be discharged to reduce the bus voltage, otherwise there will be safety hazards. The invention uses a fan to discharge the residual charge of the DC bus. see image 3 , The invention discloses a residual charge discharge circuit, which includes a DC bus, and a fan is connected between the positive DC bus and the negative DC bus. When the equipment is working normally, the DC bus is charged, and the fan is energized to rotate to cool t...

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Abstract

The invention discloses a residual charge bleeder circuit, a converter and an air conditioner. The residual charge bleeder circuit comprises a direct-current bus, and a fan is connected between a positive electrode direct-current bus and a negative electrode direct-current bus. When equipment stops supplying power for a load, the fan can consume residual charge of the direct-current bus, so that the equipment is within a safety voltage range. The residual charge of the direct-current bus can be safely released, the internal temperature of the equipment is reduced, frequent starting of the equipment is facilitated, and safety of the equipment is enhanced.

Description

technical field [0001] The invention relates to an equipment protection circuit, in particular to a residual charge discharge circuit, a converter and an air conditioner using the circuit. Background technique [0002] The main topology of the inverter for high-power variable frequency centrifuge 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 the DC bus, and a large capacitor is connected to the DC bus for energy storage. Its main structure is as follows: figure 1 shown. When the converter is working, a relatively high voltage is established on the DC bus. When the converter stops, the residual charge on the DC bus needs to be discharged through the discharge circuit, otherwise there will be safety hazards. At present, the solution u...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M1/34
CPCH02M1/34H02M1/348
Inventor 王京蒋世用刘克勤杜优凯邹加富刘帅
Owner GREE ELECTRIC APPLIANCES INC