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IGBT overcurrent protection circuit

An overcurrent protection circuit, overcurrent technology, applied in emergency protection circuit devices, protections that respond to overcurrents, electrical components, etc. The effect of interference capability, safety assurance, ease of commissioning and device upgrades

Inactive Publication Date: 2014-07-02
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] This detection method uses discrete components with low integration
And below the threshold voltage, the current flowing through the IGBT may have exceeded the rated current. If this state lasts for too long, the IGBT may be locked and cause damage to the IGBT.

Method used

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  • IGBT overcurrent protection circuit
  • IGBT overcurrent protection circuit
  • IGBT overcurrent protection circuit

Examples

Experimental program
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Embodiment Construction

[0017] Below in conjunction with accompanying drawing and specific embodiment, further illustrate the present invention, should be understood that these embodiments are only for illustrating the present invention and are not intended to limit the scope of the present invention, after having read the present invention, those skilled in the art will understand various aspects of the present invention Modifications in equivalent forms all fall within the scope defined by the appended claims of this application.

[0018] Such as figure 1 As shown, the current flowing through the IGBT is converted into a weak current signal by a current transformer, and the AC voltage signal is obtained by sampling the sampling resistor. After being converted by the absolute value conversion circuit, it becomes a DC voltage signal. After being amplified by the same phase ratio amplifier circuit, it is compared with 2.5 V Reference Voltage Comparator. When the current flowing through the IGBT is ov...

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PUM

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Abstract

The invention discloses an IGBT overcurrent protection circuit. The IGBT overcurrent protection circuit comprises an overcurrent signal generation circuit and a CPLD chip, wherein the overcurrent signal generation circuit generates an overcurrent signal according to the current of the collector of an IGBT, and the CPLD chip makes judgment and carries out outputting to block an IGBT drive signal according to the intensity of the overcurrent signal, and a DSP control chip reads the counting value of the CPLD chip and generates a reset signal. The IGBT overcurrent protection circuit can feed an overcurrent fault signal back to a DSP without the dependence on current detection through the chip; under the extreme condition that the DSP shuts down, a drive signal of the IGBT can be reliably blocked, and therefore safety of a power system is guaranteed.

Description

technical field [0001] The invention relates to an IGBT overcurrent protection circuit, which belongs to the field of overcurrent protection. Background technique [0002] In a high-voltage and high-power inverter power supply, the IGBT often bears a relatively large current, which can reach more than 100A. IGBT overcurrent is the main cause of damage to IGBT. Overcurrent protection is not only directly related to the working performance and operation safety of the IGBT device itself, but also affects the performance and safety of the entire power system. The success of IGBT applications depends largely on the quality of the overcurrent protection circuit. [0003] The voltage U between the IGBT collector and emitter CE It is numerically equal to the product of the collector current and the on-state impedance of the device. Therefore, once the IGBT overcurrent, U CE will increase with increasing collector current. According to this characteristic, the common overcurrent...

Claims

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Application Information

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IPC IPC(8): H02H7/20H02H3/08
Inventor 金龙徐志科张臻陈玮光潘鹏朱振池吴笑天
Owner SOUTHEAST UNIV