Inverter circuit of induction heating rice cooker

Details Inverter circuit of induction heating rice cooker Inverter circuit of induction heating rice cooker

2005-03-22

2005-03-22

Leung, Philip H. (Department: 3742)

Electric heating

Inductive heating

With heat exchange

C219S620000, C219S664000, C219S663000, C363S041000, C363S097000

Reexamination Certificate

active

06870144

ABSTRACT:
An inverter circuit of an induction heating rice cooker which controls a switching frequency of an inverter in a variable manner according to a variation in an input voltage and drives the inverter at the controlled switching frequency. The inverter circuit comprises a power supply circuit for rectifying and filtering a commercial alternating current (AC) voltage to supply the input voltage to the induction heating rice cooker. The inverter performs a switching operation based on the input voltage from the power supply circuit to heat the rice cooker. The inverter circuit further comprises an inverter driving circuit for outputting a drive pulse to control the switching frequency of the inverter in the variable manner according to the input voltage from the power supply circuit and drive the inverter at the controlled switching frequency. Heating power of the rice cooker does not vary with the variation in the input voltage and an internal device of the inverter is prevented from being damaged due to the variation in the input voltage, thereby enhancing durability of a product and reliability of the inverter circuit.

REFERENCES:
patent: 3593103 (1971-07-01), Chandler et al.
patent: 5854473 (1998-12-01), Malnoe
patent: 6075715 (2000-06-01), Maehara et al.
patent: 1-117293 (1989-05-01), None

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