THE CONTROL APPARATUS FOR LOAD ON-OFF

摘要

The temp. control appts. has a first comparator circuit (COMP1) for comparing the valtage corresp. to thermal data provided by a thermal sensor (TH) with a first reference voltage generated in synchronism with the zero crossings of an AC power source (PS). The first comporator circuit (COMP1) generates a pulsative output voltage which is synchronous with the zero crossing of the AC power source (PS). This output voltage causes a second reference voltage to be applied to a second comparator (COMP2) in the form of a pulsative voltage.