Insulated gate bipolar transistor (IGBT) over-current protection circuit

An overcurrent protection circuit and circuit technology, applied in emergency protection circuit devices, electrical components, output power conversion devices, etc., can solve the problems of high cost of IGBT overcurrent protection, large board area occupied, etc., to reduce product costs , reduce the occupation of PCB area, and meet the effect of low power

Inactive Publication Date: 2013-04-24
SHENZHEN INOVANCE TECH +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] The technical problem to be solved by the present invention is to provide an IGBT over-current protection circuit for the above-mentioned problems of high cost of IGBT over-current protection and large board area occupied

Method used

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  • Insulated gate bipolar transistor (IGBT) over-current protection circuit
  • Insulated gate bipolar transistor (IGBT) over-current protection circuit
  • Insulated gate bipolar transistor (IGBT) over-current protection circuit

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Embodiment Construction

[0024] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0025] Such as figure 2 As shown, the phase difference of the three-phase current output to the motor is 120° in turn, and there are six peaks in one cycle, and the phase difference of the six peaks is 60°; in addition, at any point in time, one of the three-phase currents The phase current is the sum of the other two phase currents, that is, the phase current with the largest amplitude is the actual current of the motor.

[0026] Thus, the six peaks of the three-phase current in one cycle can be taken out, and based on this, the overcurrent protection of the IGBT can be realized. Because the si...

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Abstract

The invention provides an insulated gate bipolar transistor (IGBT) over-current protection circuit which comprises a current sampling unit, a full-wave rectification unit, a peak value acquiring unit, a current comparing unit, a control unit and an IGBT drive unit. The current sampling unit is used for acquiring a three-phase output current. The full-wave rectification unit is used for respectively converting the three-phase output current to three single-direction currents. The peak value acquiring unit is used for acquiring the largest current in the three single-direction currents and outputting the largest current. The current comparing unit is used for respectively comparing the current output by the peak value acquiring unit with a quick current-limiting protection point and a limit protection point. The control unit is use for enabling the IGBT drive unit to block an IGBT or open the IGBT according to output of the current comparing unit. According to the IGBT over-current protection circuit, after the sampled three-phase output current is subjected to full-wave rectification, the peak value is used as the reference for over-current comparing, and the IGBT can be protected in a quick current-limiting mode and in a limit mode.

Description

technical field [0001] The invention relates to a power device protection circuit, more specifically, to an IGBT overcurrent protection circuit. Background technique [0002] With the improvement of automation and the demand for energy saving and consumption reduction, frequency conversion speed control equipment has been widely used. Because IGBT combines the advantages of MOSFET and GTR, it has the advantages of high switching frequency, low conduction voltage, and low driving power, and it occupies a dominant position in AC speed control systems. [0003] In the use of IGBT, the protection of IGBT is the most critical. On the one hand, because the IGBT device itself is relatively expensive, on the other hand, because the damage of IGBT will bring serious impact and damage. In addition, IGBT plays a central role in power conversion and AC speed regulation, and its application occasions are changeable and the use environment is harsh, so reliable protection of IGBT is very...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M1/32H02H7/125
Inventor 王山山李紫奎
Owner SHENZHEN INOVANCE TECH
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