SOLID_STATE_ZERO_VOLTAGE_SWITCHING_ZVS_CIRCUITS

Published:2009/7/8 22:26:00 Author:May | From:SeekIC

This circuit is effective for lamp and heater loads. Some circuits driving reactive loads require integral cycling and zero-voltage switching-when an identical number of positive and negative half cycles of voltage are applied to the load during a power period. The circuit, although not strictly a relay because of the three-terminal power connection, performs the integral cycle ZVS function when interfaced with the previous coil circuits. Fiber optics offers advantages in power control systems. Electrical signals do not flow along the non-conducting fiber, minimizing shock hazard to both operator and equipment. EMI/RFI pick up on the fiber is nonexistent-although high gain receiver circuits might require shielding, eliminating noise pick-up errors caused by sources along the cable route. Both ac and dc power systems can be controlled by fiber optics using techniques similar to the optoisolator solid-state relay. Triac triggering is accomplished through the C106BX301, a low gate trigger current SCR, switching line voltage derived current to the triac gate via the full-wave rectifter bridge. The primary difference between ftber optics solid-state relay circuits and optoisolator circuits is the gain; photo currents are much smaller.



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