Electromagnetic heating switch control circuit and electromagnetic heating device with same

Abstract

The invention discloses an electromagnetic heating switch control circuit. The control circuit comprises a power supply module, a resonance module, a switch module, a comparison module and a control module, wherein one end of the power supply module is connected with the power supply module; one end of the resonance module is connected with the other end of the power supply module; the first end of the switch module is connected with the other end of the resonance module; the second end of the switch module is grounded; the first input end of the comparison module is connected with the first end of the switch module; the comparison module is used for comparing the partial voltage of the voltage at the first end of the switch module with a reference voltage, and outputting a comparison signal; the control module is connected with the output end of the comparison module and the control end of the switch module respectively, and is used for controlling the switch module according to the comparison signal. By adopting the electromagnetic heating switch control circuit, the switch-on lag of the switch module can be restrained, the switching loss of the switch module is lowered, and reliability is enhanced. The invention further discloses an electromagnetic heating device provided with the electromagnetic heating switch control circuit.

Description

technical field [0001] The invention belongs to the technical field of electromagnetic heating, and in particular relates to an electromagnetic heating switch control circuit and an electromagnetic heating device with the control circuit. Background technique [0002] At present, in most electromagnetic heating schemes, such as the heating control of the induction cooker, such as figure 1 As shown, the turn-on control of switching devices such as IGBT (Insulated Gate Bipolar Transistor, Insulated Gate Bipolar Transistor) generally collects the divided voltage at both ends of the parallel LC resonant circuit 20' through the voltage dividing circuit 10', and then divides the voltage through The comparator 30' performs comparison and outputs a control signal, and the control unit 40', such as an MCU (Micro Control Unit, Micro Control Unit), controls the IGBT to turn on. However, for actual products, the control method of the above-mentioned switching devices is easily affected...

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Problems solved by technology

However, for actual products, the control method of the above-mentioned switching devices is easily affected by factors such as the distance between the coils and the pot type, which may cause the IGBT to be turned on ahead or behind. A large reverse impact current increases the turn-on loss of the IGBT, and even burns the IGBT, reducing the reliability of the circuit

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