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Power conversion system, and overcurrent protection circuit and method for power switch transistor

A technology for overcurrent protection circuits and power switch tubes, which is applied in the direction of emergency protection circuit devices and electrical components, and can solve problems such as damage to power switch tubes, so as to avoid voltage overshoot, improve stability and safety, and slow down shutdown speed effect

Pending Publication Date: 2019-01-18
ZHEJIANG KEENWOO TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of the shortcomings of the prior art described above, the purpose of the present invention is to provide a power conversion system, an overcurrent protection circuit and method for a power switch tube, which are used to solve the problem of overcurrent protection caused by rapid shutdown during overcurrent protection in the prior art. The problem of damage to the power switch tube by the surge voltage

Method used

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  • Power conversion system, and overcurrent protection circuit and method for power switch transistor
  • Power conversion system, and overcurrent protection circuit and method for power switch transistor
  • Power conversion system, and overcurrent protection circuit and method for power switch transistor

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Embodiment 1

[0063] Such as figure 1 As shown, the present invention provides a power conversion system 1, and the power conversion system 1 includes:

[0064] The power conversion circuit 11 and the overcurrent protection circuit 12 of the power switch tube.

[0065] Such as figure 1 As shown, the input signal of the power conversion circuit 11 is an absolute value signal of alternating current, which is used to convert the absolute value signal of alternating current into a direct current bus voltage.

[0066] Specifically, the power conversion circuit 11 includes a PFC circuit, such as a boost circuit, a buck circuit or a buck-boost circuit, and different power conversion structures can be set according to needs, which are not limited to the examples in this embodiment. Such as figure 1 As shown, in this embodiment, the power conversion circuit 11 is a type of boost circuit, specifically including a filter capacitor C1, a reactor L1, a power switch tube Q1, a boost diode D1 and a smo...

Embodiment 2

[0100] Such as figure 2 As shown, this embodiment provides a power conversion system. The difference from Embodiment 1 is that the overcurrent protection circuit 12 of the power switch tube also includes a second acquisition resistor R2, and the overcurrent detection module and Each of the soft-off protection modules includes two.

[0101] Specifically, one end of the second sampling resistor R2 is connected to the input negative electrode Vi- of the power conversion circuit 11, and the other end is connected to the reference ground PGND, and the second sampling resistor R2 detects the voltage of the power switch tube Q1. Input side current, the second sampling resistor R2 is connected to the control module (not shown in the figure) of the power switch tube Q1, the control module includes but not limited to a micro control unit (Microcontroller Unit; MCU), the control module Based on the current collected by the second sampling resistor R2, closed-loop control is performed t...

Embodiment 3

[0109] Such as Figure 4 As shown, this embodiment provides a power conversion system. The difference from Embodiment 2 is that the overcurrent protection circuit 12 of the power switch tube does not include the second acquisition resistor R2, and the overcurrent detection module and the Each of the soft-off protection modules includes three, and the output signal of each overcurrent detection module controls the input terminal, output terminal and enabling terminal of the driving module 123 respectively.

[0110]Specifically, the first output terminal of the first overcurrent detection module 1221 is connected to the input terminal of the driving module 123 , and the second output terminal is connected to the input terminal of the first soft-off protection module 1241 . The first output terminal of the second overcurrent detection module 1222 is connected to the enable terminal of the driving module 123 , and the second output terminal is connected to the input terminal of th...

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Abstract

The invention provides a power conversion system, and an overcurrent protection circuit and method of a power switch transistor. The power conversion system comprises: a sampling module for detectinga current flowing through the power switch transistor;; an overcurrent detection module that obtains an overcurrent control signal based on a current flowing through the power switch; a driving modulefor driving the power switch tube to be turned off when overcurrent occurs; a soft turn-off protection module that slows down the turn-off speed of power switches during overcurrent. when the currentflowing through the power switch tube is larger than the set value, the power switch tube is controlled to be turned off, and the turning off speed of the power switch tube is slowed down, so as to avoid the voltage overshoot. the power conversion system, the overcurrent protection circuit and method of the power switch tube detect the current flowing through the power switch tube, execute the overcurrent protection according to the detected current, slow down the turning-off speed of the power switch tube while executing the overcurrent protection, avoid the voltage overshoot on the power switch tube, and further improve the stability and safety of the power conversion system.

Description

technical field [0001] The invention relates to the field of circuit design, in particular to a power conversion system, an overcurrent protection circuit and a method for a power switch tube. Background technique [0002] Power conversion technology is an emerging electronic technology applied in the field of electronic power, which converts and controls electric energy through power switch tubes. In order to suppress the generation of harmonics and improve the power factor at the same time, the power converter is introduced into the variable frequency drive system. Due to the complex and diverse working environment of the variable frequency drive system, which has the characteristics of wide operating power, high frequency and large load fluctuations, high requirements are placed on the reliability of the power converter. [0003] Usually, when the main circuit of the power converter works abnormally, an overshoot current will be generated, and the overshoot current may c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H7/125
CPCH02H7/1252H02H7/1257
Inventor 甘鸿坚安伟国刘以峰蒲波宇
Owner ZHEJIANG KEENWOO TECH CO LTD
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