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IGBT overvoltage protection circuit and air conditioner

An overvoltage protection circuit and a technology for protecting circuits, which are applied in circuits, electrical components, electronic switches, etc., can solve problems such as poor IGBT clamping effect, and achieve the effects of simple structure, improved accuracy, and low cost

Pending Publication Date: 2021-01-15
GREE ELECTRIC APPLIANCES INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Aiming at the technical problem of poor IGBT clamping effect in the prior art, the present invention proposes an IGBT overvoltage protection circuit and an air conditioner

Method used

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  • IGBT overvoltage protection circuit and air conditioner
  • IGBT overvoltage protection circuit and air conditioner
  • IGBT overvoltage protection circuit and air conditioner

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Embodiment Construction

[0029] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention, but not to limit the present invention.

[0030] Thus, a reference to a feature in this specification will be used to describe one of the features of an embodiment of the invention and not to imply that every embodiment of the invention must have the described feature. Furthermore, it should be noted that this specification describes a number of features. Although certain features may be combined together to illustrate possible system designs, these features may also be used in other combinations not explicitly stated. Thus, unless otherwise stated, the combinations described are not intended to be li...

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Abstract

The invention provides an IGBT overvoltage protection circuit and an air conditioner. The IGBT overvoltage protection circuit comprises a working circuit provided with an IGBT and a driving circuit connected with the working circuit through a driving resistor Rg, the IGBT overvoltage protection circuit also comprises a protection circuit connected with the working circuit and the driving circuit,and the protection circuit restarts the IGBT when the IGBT overvoltage is turned off; one end of the driving resistor Rg is connected with the working circuit, and the other end of the driving resistor Rg is connected with the driving circuit. Compared with the prior art, the IGBT overvoltage protection circuit has the advantages that the structure is simple, the cost is low, a TVS tube can work near a rated point, and the accuracy of voltage clamping and the effectiveness of the circuit are greatly improved.

Description

technical field [0001] The invention relates to the field of electrical appliances, in particular to an IGBT overvoltage protection circuit and an air conditioner. [0002] technical background [0003] As a common power device, IGBT is widely used in power supplies, household appliances and air conditioners, and plays a key role. However, in practical applications, when current overload or short circuit occurs, due to high di / dt and stray inductance in the commutation path, voltage overshoot will occur, which may exceed the breakdown voltage of the IGBT and damage the IGBT. If the DC bus voltage is high, this will severely limit the application range of the IGBT. Therefore, it is usually necessary to add a clamp circuit in the drive circuit to ensure that the collector potential is not too high. [0004] Please refer to figure 1 , the commonly used collector-emitter clamp uses an external TVS tube Dz and a diode D1. When the potential at the collector of the IGBT exceeds...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03K17/082
CPCH03K17/0826H03K2217/0027
Inventor 俞贤桥黄猛王京陈宁宁肖尊辉杨博
Owner GREE ELECTRIC APPLIANCES INC
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