초록 ▼

Disclosed is a control circuit for an electric cooker. In the control circuit of the electric cooker, a voltage selection supply rectifies a selected voltage, and applies it to a voltage sensor. The voltage sensor compares the voltage from a power supply controller with a reference voltage from a ti

Disclosed is a control circuit for an electric cooker. In the control circuit of the electric cooker, a voltage selection supply rectifies a selected voltage, and applies it to a voltage sensor. The voltage sensor compares the voltage from a power supply controller with a reference voltage from a time proportion temperature controller, and applies the result to a temperature controller. The temperature controller has a time controlling resistor. The time proportion temperature controller generates a time proportion control signal having a constant period, and applies the time proportion control signal to the power supply controller. Simultaneously, a switching mode temperature controller having a thermal sensor generates a heater control signal according to a heater temperature sensed by the thermal sensor, and the heater control signal to the power supply controller. The power supply controller logically processes signals from the above temperature controllers, and generates a voltage applying signal to the heater, thereby controlling the heater to perform cooking or warming operations.

대표청구항 ▼

A control circuit for an electric cooker having a main heater and a warming heater, comprising: a plurality of voltage sensing means each of which compares a system rated voltage with an input voltage, and judge whether said input voltage is above a rated voltage, rated voltage, or below a rated vol

A control circuit for an electric cooker having a main heater and a warming heater, comprising: a plurality of voltage sensing means each of which compares a system rated voltage with an input voltage, and judge whether said input voltage is above a rated voltage, rated voltage, or below a rated voltage; a plurality of temperature controlling means which control a power supply application time according to a control signal from a respective voltage sensing means of said plurality of voltage sensing means; a time proportion temperature controller which generates a reference voltage by rectifying an external AC power supply to a DC voltage, and generates a time proportion control signal having a constant period, said time proportion control signal being generated according to a signal from said temperature controlling means; a switching mode temperature controller which has a temperature sensor, and senses whether at least one of a cooking temperature or a warming temperature is higher or lower than a threshold temperature, and controls operation of a heater according to a sensed signal generated by the temperature sensor; a power supply controller which controls said heater operation by logically processing output signals from both said time proportion temperature controller and said switching mode temperature controller, and controls a heating power by controlling a power supply voltage of a power supply means; and voltage selection supply means which selects said power supply voltage of said power supply means, rectifies said power supply voltage, and then applies said power supply voltage to said voltage sensing means.