Inverter circuit of induction heating rice cooker

摘要

An inverter circuit of an induction heating rice cooker which controls a switching frequency of an inverter in a variable manner according to a variation in an input voltage and drives the inverter at the controlled switching frequency. The inverter circuit comprises a power supply circuit for rectifying and filtering a commercial alternating current (AC) voltage to supply the input voltage to the induction heating rice cooker. The inverter performs a switching operation based on the input voltage from the power supply circuit to heat the rice cooker. The inverter circuit further comprises an inverter driving circuit for outputting a drive pulse to control the switching frequency of the inverter in the variable manner according to the input voltage from the power supply circuit and drive the inverter at the controlled switching frequency. Heating power of the rice cooker does not vary with the variation in the input voltage and an internal device of the inverter is prevented from being damaged due to the variation in the input voltage, thereby enhancing durability of a product and reliability of the inverter circuit.