Power drive circuit optically isolated

The microcomputer control system, a large number of applications is the control switch, the switch generally after the microcomputer I / O output, while the I / O drive capability is limited, usually not enough to drive the magnetic implementation of the device at some point, need to increase access drive interface circuits, TFT LCD Display in order to avoid computer disruptions quarantine measures to be taken. Such as thyristors where the main circuit is generally ac power circuits, high voltage, higher current, difficult with the computer is directly connected to the computer control signal applied coupler thyristor trigger circuit isolation.

The motor control circuit, can be applied to the coupler and the motor control circuit isolated from the high voltage circuit. Motor MOSFET or IGBT power transistor by driving current,8x2 lcd the power transistor switching control signal and the power amplification stage between the tubes to be isolated. In the optocoupler isolation level - amplifier stage - power tube connection form, requires optocoupler with high output voltage, high speed and high common mode rejection.