Induction heating cooking apparatus

Details Induction heating cooking apparatus Induction heating cooking apparatus

1980-06-26

1984-03-20

Reynolds, B. A.

Electric heating

Metal heating

Of cylinders

219 1077, 363 80, 363 97, 363131, 323275, H05B 606

Patent

active

044383118

ABSTRACT:
An induction heating coil and a self-excited inverter are connected to a ripple voltage source. The self-excited inverter comprises a transistor as a switching element and the transistor is rendered conductive responsive to a drive voltage applied for each cycle of the ripple voltage source, whereby the self-excited inverter is started at each cycle of the ripple voltage source. The self-excited inverter stops the oscillation when the voltage of the ripple voltage source becomes lower than a predetermined value. During the non-oscillation period of the intermittent oscillation, the oscillation output of the self-excited inverter is detected. If and when the oscillation output is detected at that time, the oscillation of the inverter is stopped. Furthermore, the pulses of the attenuating oscillation of the self-excited inverter during the oscillation rest period are counted. If and when the count value of the counter is smaller than a predetermined value, the oscillation of the self-excited inverter is started, whereas if and when the count value of the counter exceeds the predetermined value, the oscillaton stop state is continued.

REFERENCES:
patent: 3781505 (1973-12-01), Steigerwald
patent: 3886342 (1975-05-01), Peters, Jr.
patent: 4013859 (1977-03-01), Peters, Jr.
patent: 4016392 (1977-04-01), Kobayashi et al.
patent: 4112287 (1978-09-01), Oates et al.
patent: 4115676 (1978-09-01), Higuchi et al.
patent: 4145592 (1979-03-01), Mizukawa et al.
patent: 4275281 (1981-06-01), Kiuchi

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