Electromagnetic heating low-power continuous output control circuit

Abstract

The invention provides an electromagnetic heating low-power continuous output control circuit, and the circuit comprises a rectifier bridge, a controller and a heating module. The rectifier bridge comprises a first input end connected with an ACL line, a second input end connected with an ACN line, a first output end connected with the heating module, and a second output end connected with a ground end. The heating module comprises a wire coil, an IGBT tube and capacitors C1 and C2. The circuit also comprises a zero-crossing detection circuit, a feedback circuit and a feedback control circuit. The zero-crossing detection circuit is connected between the first input end and the controller and is used for feeding back the voltage change of the first input end to the controller; the feedback circuit comprises a first feedback branch and a second feedback branch; the first feedback branch circuit is connected between the first input end and the ground end, the second feedback branch circuit is connected between the first output end and the second input end, the first feedback branch circuit and the second feedback branch circuit are controlled by the feedback control circuit to be switched on or off, and charges stored in the capacitor C1 are discharged to a power grid when the first feedback branch circuit and the second feedback branch circuit are switched on.

Description

technical field [0001] The invention belongs to the technical field of electromagnetic heating, and in particular relates to a low-power continuous output control circuit for electromagnetic heating. Background technique [0002] The principle of the electromagnetic heater is to convert alternating current into direct current through a bridge rectifier, and then pass through a power inverter circuit to generate a high-frequency alternating magnetic field on the electromagnetic coil, and the eddy current generated by the high-frequency alternating magnetic field on the cooker is finally converted into heat energy. [0003] When the existing traditional electromagnetic heater is working, when its output power is more than 50% of the total power, due to the matching of resonance parameters, the power device can be turned on at zero voltage, and the working mode of continuous heating is adopted; when When the output power is less than 50% of the output power, the electromagneti...

AI Technical Summary

Problems solved by technology

Since the conduction of the IGBT is used for pre-discharge, it must increase the energy consumption and the loss of the IGBT, and it can only reduce the noise, but cannot fundamentally eliminate the noise

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