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Buffer circuit, Buck circuit, switching converter and air conditioner

A switching converter and snubber circuit technology, which is applied in the direction of high-efficiency power electronic conversion, adjusting electric variables, converting DC power input to DC power output, etc., can solve the problem of high switching loss, reduce switching loss, and improve work efficiency. Effect

Inactive Publication Date: 2021-04-20
GREE ELECTRIC APPLIANCES INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In view of this, the object of the present invention is to provide a snubber circuit, Buck circuit, switching converter and air conditioner, to overcome the higher problem of switching losses of current switching devices

Method used

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  • Buffer circuit, Buck circuit, switching converter and air conditioner
  • Buffer circuit, Buck circuit, switching converter and air conditioner
  • Buffer circuit, Buck circuit, switching converter and air conditioner

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Embodiment Construction

[0039] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be described in detail below. Apparently, the described embodiments are only some of the embodiments of the present invention, but not all of them. Based on the embodiments of the present invention, all other implementations obtained by persons of ordinary skill in the art without making creative efforts fall within the protection scope of the present invention.

[0040] figure 1 It is a circuit diagram provided by an embodiment of the buffer circuit of the present invention.

[0041] This embodiment provides a buffer circuit, which is applied to a Buck circuit. Such as figure 1 As shown, in the prior art, the Buck circuit generally includes an input power supply Ui, a switch tube VT, a freewheeling diode VD, a filter inductor L, and a filter capacitor C.

[0042] Generally, in the Buck circuit, the first end of the i...

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Abstract

The invention relates to the technical field of Buck circuits, and concretely relates to a buffer circuit, a Buck circuit, a switching converter and an air conditioner. The buffer circuit comprises a buffer capacitor and a buffer inductor, the first end of the buffer capacitor is connected with the first end of a switching tube in the Buck circuit, and the second end of the buffer capacitor is connected with the second end of the switching tube; and the first end of the buffer inductor is connected with the second end of the switch tube, and the second end of the buffer inductor is connected with the cathode end of a fly-wheel diode in the Buck circuit. After the switching tube is switched on, the buffer capacitor discharges, so that voltage suppression is performed when the switching tube is switched off, and zero-voltage switching-off is realized; and after the switching tube is cut off, the buffer inductor is charged, so that current suppression is performed when the switching tube is conducted, zero-current conduction is realized, the switching loss is reduced, and the working efficiency of the circuit is effectively improved.

Description

technical field [0001] The invention relates to the technical field of Buck circuits, in particular to a buffer circuit, a Buck circuit, a switching converter and an air conditioner. Background technique [0002] Buck circuit, also known as step-down circuit, its basic feature is a DC-DC step-down buffer conversion circuit, the output voltage is lower than the input voltage. In the fields of computer, communication, industrial control, instrumentation, medical equipment, etc., the application of switching power supply from high-voltage DC to low-voltage DC using Buck circuit design has been very extensive. [0003] The switching device works at a very high frequency, the switching loss is proportional to the switching frequency, and the switching loss cannot be ignored. The switching device is an important electronic device in the Buck circuit. In the Buck circuit, the switching device needs to be maintained at a high operating frequency, so that the switching loss of the s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/156H02M1/34
CPCY02B70/10
Inventor 黄泽鸿季念
Owner GREE ELECTRIC APPLIANCES INC
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