Apparatus for sensing small object in high-frequency induction h

Details Apparatus for sensing small object in high-frequency induction h Apparatus for sensing small object in high-frequency induction h

1994-08-08

1995-06-13

Leung, Philip H.

Electric heating

Inductive heating

With heat exchange

219665, H05B 608, H05B 612

Patent

active

054245141

ABSTRACT:
An apparatus for sensing a small object in a high-frequency induction heating cooker, comprising a rectifying/smoothing circuit for rectifying and smoothing an AC voltage from a power source to convert it into a DC voltage, an inverter for converting the DC voltage into a high frequency of AC voltage, a heating coil for generating an induced current according to the AC voltage from the inverter, a synchronization detector for detecting a synchronization signal, a current detector for detecting an amount of current through the rectifying/smoothing circuit, a voltage detector for detecting a voltage from a desired position of the inverter, a small object sensing circuit for discriminating presence of the small object in a cooking container in response to output voltages from the current detector and the voltage detector, a clock generator for generating a clock signal for system synchronization, a pulse generator for generating a pulse signal in response to output signals from the clock generator and the small object sensing circuit, a reset circuit for outputting a reset signal, a NOR gate for NORing the pulse signal from the pulse generator and the reset signal, and a controller for controlling the inverter in response to the synchronization signal and an output signal from the NOR gate.

REFERENCES:
patent: 4456807 (1984-06-01), Ogino et al.
patent: 4511781 (1985-04-01), Tucker et al.
patent: 4600823 (1986-07-01), Hiejima
patent: 4764652 (1988-08-01), Lee
patent: 4810847 (1989-03-01), Ito
patent: 4820891 (1989-04-01), Tanaka et al.
patent: 5111014 (1992-05-01), Tanaka et al.

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