A driving circuit and electrical equipment with the same

Abstract

The invention discloses a drive circuit and electrical equipment with the circuit. Wherein, the drive circuit includes: a drive module, a logic change module, and an isolation module; the drive module is used to drive the fault signal sent by the driver chip to the logic change module; the logic change module is used for the receiving The fault signal of the drive chip is transmitted to the isolation module through switch control; the isolation module is used to isolate the control chip power supply voltage from the drive power supply voltage, and the logic change module The transmitted fault signal is transmitted to the control chip. Adopting the technical solution of the present invention enables fault reporting to be realized even when the power supply of the drive chip fails, effectively avoiding protection failure caused by failure of the power supply of the drive chip during operation, thereby reducing the risk of system operation.

Description

technical field [0001] The invention relates to the technical field of power electronics, in particular to a drive circuit and electrical equipment with the circuit. Background technique [0002] In the prior art, the insulated gate bipolar transistor IGBT, as a power device, has the advantages of high input impedance, fast switching speed, on-state voltage drop, and strong current flow capability, and is widely used in frequency converters, wind power converters, Photovoltaic inverters and other fields. The driving circuit of the IGBT based on the M57962L chip has a simple structure, can reliably realize the switching control of the IGBT, and has an effective short-circuit protection function. Among them, the M57962L driver chip is an IGBT driver chip with a wide range of applications. [0003] In the drive circuit using this chip, if the M57962L power supply is abnormal, such as a sudden power failure, it will not be able to report a drive failure, and at the same time, ...

AI Technical Summary

Problems solved by technology

[0005] When the drive chip power supply VCC fails, the cathode and anode of the primary diode of the optocoupler N1 have no voltage, so they cannot be turned on normally, so the drive fault cannot be reported, and the fault signal cannot be sent to the upper-level main controller to participate in the control; At this time, the IGBT of this road remains off, but the IGBTs of the other roads still send out PWM waves, which causes the voltage output of this phase of the inverter to lose waves, and the three phases are unbalanced, which is extremely harmful to the equipment.

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