Driving circuit and electrical equipment with same

Abstract

The invention discloses a driving circuit and electrical equipment with the same. The driving circuit comprises a driving module, a logical change module and an isolation module. The driving module is used for driving the logical change module through fault signals sent by a driving chip. The logical change module is used for transmitting the received fault signals of the driving chip to the isolation module by means of on-off control. The isolation module is used for isolating a control chip power voltage from a driving power voltage and transmitting the fault signals transmitted by the logical change module to a control chip. According to the technical scheme, fault reporting can still be achieved under the condition of power failure of the driving chip, protection failure caused by the power failure of the driving chip in the operating process is effectively avoided, and therefore operating risks of the system are lowered.

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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