Induction heating cooker with phase difference control

Details Induction heating cooker with phase difference control Induction heating cooker with phase difference control

1990-06-29

1993-09-28

Leung, Philip H.

Electric heating

Metal heating

Of cylinders

219 10493, 363 97, H05B 606

Patent

active

052488667

ABSTRACT:
An induction heating cooker comprises an inverter circuit. The inverter circuit has a heating coil and a resonance capacitor that resonates with the heating coil to generate high-frequency electric power with which an object to be heated is inductively heated. The cooker further includes a phase comparator for comparing the phase of a first signal that correlates to the phase of an output voltage of the inverter circuit with the phase of a second signal that correlates with the phase of a current flowing to the resonance capacitor; a phase difference setter for setting the phase difference of the first and second signals; and a frequency controller for controlling an oscillation frequency of the inverter circuit according to a signal from the phase difference comparator to establish the phase difference set by the phase difference setter.

REFERENCES:
patent: 3718852 (1973-02-01), Bailey
patent: 4112286 (1978-09-01), Alderman et al.
patent: 4280038 (1981-07-01), Havas et al.
patent: 4385348 (1983-05-01), Wisner
patent: 4736082 (1988-04-01), Matsuo et al.
patent: 4810847 (1989-03-01), Ito
patent: 4820891 (1989-04-01), Tanaka et al.
K. Mauch, "Transistor Inverters for Medium Power Induction Heating Applications", 1986 IEEE Industry Applications Society Annual Meeting, Part 1, Oct., 1986, pp. 555-562.

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