| 摘要 |
PURPOSE:To insulate a current transformer electrically from an inverter circuit, and to read a detecting value directly by a control section by arithmetically operating the on time of a switching element so that the input or output currents of the inverter circuit reach a set value and generating the on-time pulses of the drive of the switching element. CONSTITUTION:A magnetron driver circuit is composed of a switching-element driving section 20 and a microcomputer control section 30. The output currents of an inverter circuit are detected by a C.T 13, and the detecting value is read directly by a control section 30. The control section 30 compares and arithmetically operates the set value of an output previously stored in the memory of the control section 30 from the inverter circuit or a set value by the operation of the set key of a user and the C.T detecting value, and determines the on time of a switching element 5. The control section 30 transmits a signal corresponding to the on time over a switching-element driving section 20 through a photo-coupler 40 by one line type signal conductor, and the switching-element driving section 20 outputs on-time pulses corresponding to the on time, thus driving the switching element 5. |
