Induction heating apparatus having adjustable heat output

Details Induction heating apparatus having adjustable heat output Induction heating apparatus having adjustable heat output

1985-01-02

1986-07-15

Leung, Philip H.

Electric heating

Metal heating

Of cylinders

219 1049R, 219 1041, 323285, 363 95, 363 97, H05B 612, H05B 606

Patent

active

046008233

ABSTRACT:
An induction heating apparatus comprises a high frequency generation circuit (1) having a heating coil (3), a frequency controlling circuit (10), a duty-cycle controlling circuit (29) and an output setting knob (12). The output setting knob (12) is interlockingly operated with both of the frequency control circuit (10) and the duty-cycle controlling circuit (29) to simultaneously control the oscillation frequency and the duty ratio of the high frequency generation circuit (1). The frequency control circuit (10) has a characteristic of reducing the amount of change in the oscillation frequency of the high frequency generation circuit (1) to be changed in response to change in the volume of adjustment of the output setting knob (12) as the output set by the output setting knob (12) is increased, and the duty-cycle controlling circuit (29) has a characteristic of reducing the amount of change in the duty ratio of the high frequency generation circuit (1) to be changed in response to change in the volume of adjustment of the output setting knob (12) as the output set by the output setting knob (12) is increased.

REFERENCES:
patent: 3671853 (1972-06-01), Weischedel et al.
patent: 4147910 (1979-04-01), Kiuchi et al.
patent: 4321526 (1982-03-01), Weischedel
patent: 4356371 (1982-10-01), Kiuchi et al.
patent: 4467165 (1984-08-01), Kiuchi et al.

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