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IGBT driving dynamic voltage rise control circuit

A control circuit and dynamic voltage technology, applied in the direction of electrical components, output power conversion devices, etc., can solve the problems of unsatisfactory overvoltage suppression effect, large power consumption of active clamping circuit, etc., and achieve simple structure and high reliability , the effect of suppressing the spike

Pending Publication Date: 2020-05-19
XI'AN PETROLEUM UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But when the IGBT is turned off, most of the current fed back through the active clamp circuit is bypassed by the lower tube of the previous stage, and only a small part of the current flows into the gate, resulting in a large power consumption of the active clamp circuit , and the overvoltage suppression effect is not ideal

Method used

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  • IGBT driving dynamic voltage rise control circuit
  • IGBT driving dynamic voltage rise control circuit
  • IGBT driving dynamic voltage rise control circuit

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Embodiment Construction

[0025] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0026] The IGBT driving dynamic voltage rise control circuit provided by the present invention, such as figure 1 As shown, it includes a current amplifier circuit 2 with adjustable magnification, a controller 3, a power main circuit 4, a voltage rising slope control circuit 5, an active clamp circuit 6, a drive circuit 7, a current sampling circuit 8, and an IGBT drive dynamic voltage Rising control circuit 1.

[0027] Among them, the current amplifying circuit 2 with adjustable magnification is used to control the rising slope of the IGBT collector voltage, the controller 3 is used to control the entire circuit, the power main circuit 4 is used for current detection and driving IGBT, and the voltage rising slope control circuit 5 is used For monitoring the rising slope of the voltage, the active clamping circuit 6 is used for monitoring the absolute value o...

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Abstract

The invention discloses an IGBT driving dynamic voltage rise control circuit, which comprises a magnification-adjustable current amplification circuit. The magnification-adjustable current amplification circuit is used for controlling the rising slope of an IGBT collector voltage; a controller is used for controlling the whole circuit; a power main circuit is used for current detection and IGBT driving; and a voltage rising slope control circuit is used for monitoring the voltage rising slope; an active clamping circuit is used for monitoring the voltage absolute value; a driving circuit is used for isolating a high-voltage circuit and a control circuit; and a current sampling circuit is used for sampling current and feeding back the current to the controller. According to the invention, the turn-off voltage spike can be effectively suppressed, and the circuit has the characteristics of high reliability, simple structure and easy implementation.

Description

technical field [0001] The invention relates to the technical field of power electronics, in particular to an IGBT driving dynamic voltage rise control circuit. Background technique [0002] The function of the drive protection circuit is to connect the high-voltage main circuit and the low-voltage control circuit to ensure that the IGBT can work normally, and to make corresponding actions in time under some extreme conditions, such as overvoltage, overcurrent, overheating and other failure states. , Reliable protection of the IGBT from damage. Therefore, in order to improve the reliability of IGBT operation, the more common method is to add a passive snubber circuit to absorb the surge voltage generated when it is turned off, so it is also called a snubber circuit. Although passive snubber circuits are simple and effective, they are bulky and consume high power. In small and medium power applications, active clamping circuits are more commonly used to suppress off-voltage...

Claims

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Application Information

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IPC IPC(8): H02M1/08H02M1/32
CPCH02M1/08H02M1/32H02M1/0038H02M1/0009
Inventor 李云涛李琳刘海龙
Owner XI'AN PETROLEUM UNIVERSITY
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