The working principle of the drive circuit of the frequency converter is that the signal current and signal voltage of six pulses emitted by the main circuit board of the frequency converter are amplified by six photoelectric couplers and push-pull amplification circuits. Amateurs of Guangzhou Keyu Inverter Maintenance Training Center kindly remind that when the IGBT of high-power transistor in inverter circuit needs to be turned on, the positive voltage of 15V will be output to the high-power gate and emitter. To ensure that the high-power transistor IGBT in the inverter circuit can be well turned on, and when the high-power transistor IGBT in the inverter circuit needs to be turned off, a negative voltage of 5- 10V is output to ensure that the high-power transistor IGBT in the inverter circuit can be well turned off.

Inverter drive circuit not only controls the turn-on or turn-off of IGBT in inverter circuit, but also undertakes the task of inverter overcurrent detection. Guangzhou Keyu Inverter Maintenance Training Center amateur reminder: When the inverter has overcurrent for some reason, the current detection circuit will immediately reflect the monitored overcurrent to the microprocessor in the main circuit board of the inverter, and the microprocessor circuit of the inverter will handle the overcurrent fault.