Surge preventing circuit for electromagnetic induction cooking a

Details Surge preventing circuit for electromagnetic induction cooking a Surge preventing circuit for electromagnetic induction cooking a

1991-07-25

1992-03-24

Deboer, Todd E.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Voltage regulator protective circuits

361 91, 361103, 219 1055B, H02H 710

Patent

active

050993798

ABSTRACT:
A surge preventing circuit for an electromagnetic induction cooker comprising a heating plate temperature sensor, an upper plate temperature sensor, a collector voltage limiting circuit, an abnormal condition sensor, a gate circuit, a minimum turn-on time setting unit, and a minimum turn-on time output controller.
The surge preventing operation is carried out by applying a detection signal to a microcomputer when the temperature of the heating plate and the upper plate rises excessively or when the collector voltage of the power transistor is greater than a rated value and cutting off an output voltage of an integrator to be applied to a charge/discharge unit, an then when the output voltage of the charge/discharge unit is lower than a rated value, cutting off the driving of an inverter circuit, thereby preventing a large surge voltage from generating at the inverter circuit.

REFERENCES:
patent: 4233557 (1980-11-01), Alberkrack
patent: 4752892 (1988-06-01), Ahl et al.

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