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
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[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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