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Triac zero-crossing voltage trigger drive circuit (MOC3040 application circuit)

This device is an ideal interface device between the output of single chip microcomputer and bidirectional thyristor. It consists of an input part and an output part, and the input part is a gallium arsenide LED. Under the action of 5~15mA forward current, the diode emits infrared rays with sufficient intensity to trigger the output part. Part of the output is a silicon photosensitive bidirectional thyristor, which can conduct in both directions under the action of ultraviolet rays. The device is a six-pin dual-in-line package, and its pin configuration and internal structure are shown in the following figure:

Some models of optically coupled bidirectional thyristor drivers also have zero-crossing detectors. Only when the voltage is guaranteed to be zero (close to zero) can the thyristor be triggered to conduct. Such as MOC3030/31/32 (for 115V AC) and MOC3040/41 (for 220V AC).The following diagram is a typical application circuit of the MOC3040 series of zero-crossing voltage triggered bidirectional thyristor driver.

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