Zero potential switching drive control circuit in resonant inverter

摘要

The present invention detects a zero potential required for switching power supply drive control in an electronic cooking apparatus (e.g., a microwave oven) employing a resonance inverter as a power supply control circuit, detects a zero potential required for switching power supply drive control, (Switching on / off) of a conventional zero-potential switching drive control circuit. Since the conventional zero-potential switching drive control circuit has an analog control circuit configuration using a plurality of comparators, resistance capacitors, and the like, And it is intended to solve the problem that unstable power supply control can not be overcome due to deviation of each circuit element, and thus the breakage of the circuit element and issuance of a cooking defect are caused.;SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a method and apparatus for delaying a zero-potential detection signal through a flip-flop, counting on-time and off-time of a switching element from a zero-By performing the switching control of the overvoltage in the resonant type inverter through the digital circuit configuration for performing the drive control, it is possible to easily make the integrated circuit and to stabilize the power supply control at the correct timing, This is applied to a power control circuit using a resonant inverter.