JPH0298490U

JPH0298490U -

Info

Publication number: JPH0298490U
Application number: JP689289U
Authority: JP
Priority date: 1989-01-24
Filing date: 1989-01-24
Publication date: 1990-08-06

Description

[Brief explanation of drawings]

第１図はマグネトロン駆動制御回路の一実施例
を示す回路図であり、第２図は、この回路図中の
リセツト回路１０の動作波形図であり、第３図は
従来の同回路図である。１……マグネトロン、２……インバータ電源、
９……ソフトスタート回路、１０……リセツト回
路、１０ｂ……フオトカプラ、１０ｅ……コンデ
ンサ、１０ｇ……比較器。 FIG. 1 is a circuit diagram showing an embodiment of the magnetron drive control circuit, FIG. 2 is an operating waveform diagram of the reset circuit 10 in this circuit diagram, and FIG. 3 is a conventional diagram of the same circuit. . 1... Magnetron, 2... Inverter power supply,
9...Soft start circuit, 10...Reset circuit, 10b...Photocoupler, 10e...Capacitor, 10g...Comparator.

Claims

[Scope of claims for utility model registration] (1) Magnetron 1, inverter power supply 2,
A soft start circuit 9 gradually lowers the switching frequency to a reference value at the time of start, and a voltage after rectifying the power supply voltage is monitored, and when this voltage falls below the reference value, a signal is output to the soft start circuit 9 and the switching frequency is restarted. 1. A magnetron drive control circuit comprising a reset circuit 10 which performs a soft start in the same way as at the time of starting when the voltage reaches a reference value. (2) Connect the power supply voltage to the input side and the capacitor 1 to the output side.
2. The magnetron drive control circuit according to claim 1, wherein a reset circuit 10' is constituted by a photocoupler 10b connected to each of the capacitors 10e and 10g, which compares the voltage of the capacitor 10e with a reference voltage.