Output control circuit of a 4-burner electronics induction heati

Details Output control circuit of a 4-burner electronics induction heati Output control circuit of a 4-burner electronics induction heati

1989-05-31

1991-04-23

Leung, Philip H.

Electric heating

Metal heating

Of cylinders

219 1041, 219 10493, 363 97, 363131, 323902, H05B 608

Patent

active

050102230

ABSTRACT:
An output control circuit of a 4-burner electronics induction heating cook system comprises a unit for measuring the proportional setting time to selectively operate the timing on-off control and the frequency control of a heating load; an invertor circuit for generating a proportional time and applying this to the load; a current feedback/output adjusting circuit provided with a differential amplifier inputing a high or low level signal according to a signal from the current detector; an output setting control portion provided with a unit for comparing the signals from the circuit connected to the adjusting circuit and the saw tooth wave generating circuit and then outputing a pulse width modulation signal; an output setting control portion provided with at least one photocoupler wired in an OR configuration to control the operation of the control portion and a microprocessor connected to control the operation of the photocouplers; a base operating portion and a timing circuit for controlling an invertor circuit, thereby preventing current surges generated by the maximum outputing step and for preventing noise caused by the mutual interference field generated between plural heating areas at the minimum output step.

REFERENCES:
patent: 4223195 (1980-09-01), Bechtel
patent: 4453068 (1984-06-01), Tucker et al.
patent: 4467184 (1984-08-01), Loessel

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