Power controlling circuit for automatic regulating apparatus

摘要

A power controlling circuit for automatic temperature regulator or the like using a zero voltage switching control. Clocks are dispersed and selected, in accordance with control factor, from among the clocks synchronized with the load power supply when zero voltage is detected from the load side to perform the zero cross control of the energization to the load through the detection of the zero voltage from the load side thereby to drive the zero cross control by the selection clock. The current limit close to the phase control can be achieved without any production of the noises. Also, the power control can be achieved without any production of the noises and does not damage the resolution and response property.