Electromagnetic heating system and protection device and method thereof

Abstract

The invention discloses an electromagnetic heating system and a protection device and method thereof. The device comprise a resonance unit, a driving unit, a control chip, a current detection unit anda power control unit; the resonance unit comprises a heating coil, a resonant capacitor and a switch tube; the output end of the driving unit is connected with the control end of the switch tub e todrive the switch tube; the control chip is used to output a PPG signal to the driving unit so that the driving unit controls ON/OFF of the switch tube; the current detection unit detects the current of the resonant unit, and generates a protection signal when the current of the resonant unit is greater than a preset current threshold; and power control unit controls a first preset power supply tostop supplying power to the driving unit when receiving the protection signal so that the switch tube is turned off. The protection device of the invention monitors the current through the switch tube, a power supply is stopped supplying power to the driving unit when the electromagnetic heating system has a fault, the switch tube is avoided from overtemperature or overcurrent breakdown due to thecircuit fault, and a protection mechanism is improved.

Description

technical field [0001] The invention relates to the technical field of household appliances, in particular to a protection device for an electromagnetic heating system, an electromagnetic heating system and a protection method for the electromagnetic heating system. Background technique [0002] In related technologies, the control chip of the electromagnetic heating system adjusts the width of the output pulse according to the target power, and the output pulse signal passes through the driving circuit to control the switching on and off of the switching tube, so as to control the heating work of the electromagnetic heating system. However, the disadvantage of the related technology is that in the actual use process, the switch tube is in the normally open state due to the pulse signal falsely turned on in the electromagnetic heating system or the failure of the drive circuit, which causes the current of the switch tube to increase linearly, and even causes the switch tube t...

AI Technical Summary

Problems solved by technology

However, the disadvantage of the related technology is that in the actual use process, the switch tube is in the normally open state due to the pulse signal falsely turned on in the electromagnetic heating system or the failure of the drive circuit, which causes the current of the switch tube to increase linearly, and even causes the switch tube to fail. Over-current or over-temperature breakdown

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