Soft turn-off protection circuit for power device and method

A power device and protection circuit technology, which is applied in the field of soft turn-off protection circuit, can solve the problems of IGBT overvoltage damage, achieve the effect of avoiding overvoltage damage, improving reliability and anti-interference ability, and raising the comparison voltage

Active Publication Date: 2017-11-24
GREE ELECTRIC APPLIANCES INC
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the traditional shutdown technology, when the IGBT is over-current, the over-current signal is usually sent to the DSP control circuit for processing. The DSP control circuit includes a DSP chip and a driving circuit, and the DSP chip controls the driving circuit to output a low level to the IGBT. The gate is turned off, this way of directly turning off the IGBT will cause IGBT overvoltage damage

Method used

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  • Soft turn-off protection circuit for power device and method
  • Soft turn-off protection circuit for power device and method
  • Soft turn-off protection circuit for power device and method

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Embodiment Construction

[0032] like figure 1 As shown, the present invention proposes a soft shutdown protection circuit, including: a DSP control circuit, an overcurrent detection circuit and a delay shutdown circuit. The overcurrent detection circuit is connected with the power device and the DSP control circuit, and is used to detect whether the power device is overcurrent, and outputs a control signal to the DSP control circuit when the power device is overcurrent.

[0033] The DSP control circuit includes a DSP chip and a drive circuit connected to the DSP chip. The DSP chip controls the on-off of the power device through the drive circuit. When the DSP chip does not receive the control signal from the over-current detection circuit, the DSP chip controls the drive circuit to output high Level to the control terminal of the power device to maintain its normal operation; when the DSP chip receives the control signal from the overcurrent detection circuit, the DSP chip controls the drive circuit t...

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Abstract

The invention discloses a soft turn-off protection circuit for a power device and a method. The soft turn-off protection circuit comprises a DSP (digital signal processing) control circuit and an over-current detection circuit, the over-current detection circuit is connected with the power device and the DSP control circuit and further connected with a delay turn-off circuit, and a first capacitor is arranged in the delay turn-off circuit and connected with a control end of the power device. When the over-current detection circuit detects that the power device generates over-current, the DSP control circuit transmits a turn-off signal to the control end of the power device, the delay turn-off circuit is powered on, the first capacitor is charged, and voltage delay reduction of the control end of the power device. The soft turn-off protection circuit can effectively avoid over-voltage damage caused by directly turning off the power device.

Description

technical field [0001] The invention relates to the technical field of protection circuits for power devices, in particular to a soft-off protection circuit and method for power devices. Background technique [0002] Power devices are mainly used for electronic power switching, power conversion, power amplification, line protection, etc., and are essential electronic components in power control circuits and power switching circuits. Common power devices include: high-power transistors, thyristors, bidirectional thyristors, GTOs, MOSFETs, IGBTs, etc. [0003] Taking the IGBT as an example, the driving circuit ensures the safe and reliable operation of the IGBT. The IGBT will have a large di / dt when it is turned on and off at high frequency. The stray inductance in the line can be reduced but cannot be avoided. Therefore, when the IGBT is suddenly turned off, the energy stored in the inductor will be released at the rate of L*di / dt, causing the IGBT overvoltage. In the tradi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H7/20H02H3/093H02H3/06
CPCH02H3/06H02H3/093H02H7/205
Inventor 靳珂珂张良浩乔一伦
Owner GREE ELECTRIC APPLIANCES INC
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