Inverter power source control for high frequency heater

Details Inverter power source control for high frequency heater Inverter power source control for high frequency heater

2007-06-12

2007-06-12

Leung, Philip H. (Department: 3742)

Electric heating

Microwave heating

With control system

C219S716000, C219S702000, C363S021100

Reexamination Certificate

active

10558423

ABSTRACT:
An oscillation control signal generated by an inverter power source control circuit (12) includes a reference voltage setting signal for approximating the current waveform of the AC output form the AC power source (1) to a sinusoidal wave by making both sides of the waveform generate current according to the fluctuation of the PWM control signal, and a waveform shaping signal consisting of a peak adjustment signal of a sinusoidal waveform for approximating the waveform peak portion of the current waveform to a sinusoidal wave by subtraction. Accordingly, even if the PWM control signal fluctuates, it is possible to automatically improve the power factor of the power source circuit to a value higher than a predetermined value by approximating the current waveform of the AC output from the AC power source to the sinusoidal wave, thereby improving the efficiency of the power source.

REFERENCES:
patent: 4900885 (1990-02-01), Inumada
patent: 5124518 (1992-06-01), Lee
patent: 5222015 (1993-06-01), Nakagawa
patent: 5354972 (1994-10-01), Han
patent: 4-359889 (1992-12-01), None
patent: 6-215868 (1994-08-01), None
patent: 2000-243548 (2000-09-01), None
patent: 2002-56966 (2002-02-01), None

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