Induction heating apparatus with protection against power interr

Details Induction heating apparatus with protection against power interr Induction heating apparatus with protection against power interr

1984-12-31

1986-07-08

Leung, Philip H.

Electric heating

Metal heating

Of cylinders

219 1049R, 363 97, 363 46, 361 90, 323299, H05B 612, H05B 606

Patent

active

045995044

ABSTRACT:
According to the present invention, an induction heating apparatus comprises a rectifying circuit for rectifying an AC voltage from an AC power source, an inverter circuit for converting a DC output from the rectifying circuit to a high frequency current and supplying it to a heating coil, a circuit for detecting a fluctuation in the AC power source through a low voltage converting section coupled to the AC power source, this detecting circuit having a detection characteristic which can hold the detecting state for at least a constant time, and a controlling circuit for controlling the inverter circuit in the stopped state or driving state in accordance with the presence or absence of a detection output from the circuit for detecting the fluctuation in the AC power source voltage.

REFERENCES:
patent: 3921058 (1975-11-01), Tanaka et al.
patent: 4011499 (1977-03-01), Betsill et al.
patent: 4352000 (1982-09-01), Fujishima et al.
patent: 4438311 (1984-03-01), Tazima et al.

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