| 摘要 |
PURPOSE:To permit to make the on-off control of a switching element even through a microcomputer and the like which control cooking software, by making it possible to change the time of an oscillation control unit at the zero reading point point of rectifier output voltage. CONSTITUTION:The apparatus in the title, that has an inverter circuit 13 consisting mainly of a resonance capacitor 6 and a switching element 5, an oscillation control unit 7 controlling the on time band of the switching element 5, and a zero cross point detection unit 8 detecting the zero reading point of the output voltage of a rectifier 2, makes a change in setting the on time of the switching element 5 by the oscillation control unit 7 in synchronization with the zero reading point of the voltage of a commercial supply 1, which means such a control as making an oscillation at the time, same as the present one until the next zero reading point of the voltage is reached. This, in the use of a type of commercial power supply having a range between 50Hz/60Hz, makes it possible to control setting the on time of the switching element at every speed between 10ms/8.33ms, corresponding to half the cycle of the rangeand also it possible to form the oscillation control unit out of a microcomputer and the like. |
