High side circuitry triac

Details High side circuitry triac High side circuitry triac

H - Electricity

03

K

H03K 3/352 (2006.01) G05F 1/45 (2006.01) H05B 41/392 (2006.01)

Patent

CA 2309444

Disclosed is circuitry which permits a thyristor to be triggered in quadrants II and III rather than triggering the thyristor in a high side configuration or quadrants I and IV as common in the prior art. The circuitry of the present invention uses an A/C line to trigger quadrant III of a thyristor and to charge a capacitor during the positive phase of the A/C cycle. During the negative phase, the circuitry is designed to use the discharge of the capacitor to trigger quadrant II of the thyristor. Configuring the circuit in this manner permits a thyristor to be used without the need to use quadrant IV and its increased power requirements. Also disclosed is a method of triggering a thyristor using a power line to trigger quadrant III of the thyristor using the power line to charge a capacitor, and using the capacitor to trigger quadrant II of the thyristor.

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