Electric heating – Metal heating – Of cylinders
Patent
1990-12-17
1992-06-23
Leung, Philip H.
Electric heating
Metal heating
Of cylinders
363 98, H05B 668
Patent
active
051245183
ABSTRACT:
A high frequency heating apparatus has an output controlling function to prevent breakdown of the switching element in an invertor circuit, while also eliminating noise generated by the frequency changes caused by the various consumption power signals generated. A microprocessor produces a consumption power change signal according to the user's preference, that activates a switching element, typically a solid-state component, as a function of the change signals produces. The inventive heating apparatus operates in an output control mode according to a particular duty cycle. A reference voltage is used with a comparator to produce a signal generating a pulse signal of variable width, according to the signals outputted from the microprocessor. The pulse width signals control the switching element to maintain a constant consumption power according to a particular duty cycle, thereby preventing the microprocessor output signals from adversely driving the switch element which leads to breakdown as a result of the undesirable noise generated due to the frequency change.
REFERENCES:
patent: 4777575 (1988-10-01), Yamato et al.
patent: 4825028 (1989-04-01), Smith
patent: 4866589 (1989-09-01), Satoo et al.
patent: 4900885 (1990-02-01), Inumada
patent: 4920246 (1990-04-01), Aoki
Gold Star Co. Ltd.
Leung Philip H.
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