High-frequency heating apparatus having digital controlled inver

Details High-frequency heating apparatus having digital controlled inver High-frequency heating apparatus having digital controlled inver

1989-06-22

1990-10-09

Leung, Philip H.

Electric heating

Metal heating

Of cylinders

219 1077, 363 97, 323902, H05B 668

Patent

active

049622927

ABSTRACT:
A high-frequency heat source supplies a predetermined high-frequency heat output. An inverter circuit receives an AC input and supplies a high-frequency output to drive the high-frequency heat source. The inverter circuit includes a circuit for rectifying the AC input, and a switching element for switching a DC output from the rectification circuit. A timing circuit is coupled to the inverter circuit to detect a switching timing of the switching element to the inverter circuit. A controller outputs an ON/Off signal having a predetermined duty ratio corresponding to a heating output set value associated with the predetermined high-frequency heating output. The ON/Off signal is output at a predetermined timing in response to a detection output from the timing circuit. A drive circuit drives the switching element in the inverter circuit in response to the ON/Off signal output from the controller. A first isolation circuit electrically isolates the timing circuit from the controller. A second isolating circuit electrically isolates the controller from the drive circuit.

REFERENCES:
patent: 3940684 (1976-02-01), Heinzman et al.
patent: 3973165 (1976-08-01), Hester
patent: 4074101 (1978-02-01), Kiuchi et al.
patent: 4092510 (1978-05-01), Kiuchi et al.
patent: 4229688 (1980-10-01), Knox et al.
patent: 4383157 (1983-05-01), Nakata et al.
patent: 4680506 (1987-07-01), Nilssen
patent: 4757176 (1988-07-01), Suzuki et al.
patent: 4825028 (1989-04-01), Smith
patent: 4833581 (1989-05-01), Ishiyama

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