Electromagnetic cooker including load control

Details Electromagnetic cooker including load control Electromagnetic cooker including load control

1989-06-09

1992-05-05

Leung, Philip H.

Electric heating

Metal heating

Of cylinders

219 10493, 363 37, 363 95, H05B 608

Patent

active

051110148

ABSTRACT:
In an electromagnetic cooking apparatus, low heating power control is carried out by turning ON/OFF a DC power supply circuit, or rectifier circuit, at a commercial frequency lower than an inverting frequency of DC/AC inverter. The electromagnetic cooking apparatus includes: a DC (direct current) power supply for producing DC power from low-frequency AC (alternating current) power; a DC-to-AC inverting circuit coupled to the DC power supply and including a switching element and also a heating coil, for inverting the DC power inputted from the DC power supply into high-frequency AC power so as to heat a metal pan by energizing the heating coil with the high-frequency AC power, thereby electromagnetically inducing eddy currents within the metal pan; a monitoring circuit for monitoring switching conditions of the switching element so as to output a switching condition signal; and an ON/OFF-controlling circuit for turning ON/OFF power supply operation of the DC power supply, or inverting operation of the DC/AC inverter circuit in response to the switching condition signal at a timing period defined by a time constant smaller than a thermal time constant determined by a heat capacity of a metal material of the pan.

REFERENCES:
patent: 4016390 (1977-04-01), Amagami et al.
patent: 4277667 (1981-07-01), Kiuchi
patent: 4320273 (1982-03-01), Kiuchi
patent: 4352000 (1982-09-01), Fujishima et al.
patent: 4356371 (1982-10-01), Kiuchi et al.
patent: 4429205 (1984-01-01), Cox
patent: 4430542 (1984-02-01), Kondo et al.
patent: 4456807 (1984-06-01), Ogino et al.
patent: 4467165 (1984-08-01), Kiuchi et al.
patent: 4626978 (1986-12-01), Thouvenin

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