Electromagnetic heating apparatus and driving circuit of power switch tube used in electromagnetic heating apparatus

Abstract

The invention discloses an electromagnetic heating apparatus and a driving circuit of a power switch tube used in the electromagnetic heating apparatus. The driving circuit comprises an integrated driving chip and a control chip, wherein the integrated driving chip has a driving output port, a chip power supply port, a driving voltage control signal input port and a main control signal input port; the integrated driving chip outputs a driving signal to the power switch tube to drive the switch-on and switch-off of the power switch tube through the driving output port; the integrated driving chip is integrated with a voltage conversion unit for changing the driving voltage corresponding to the driving signal; and the control chip controls the integrated driving chip to enable the power switch tube to be operated in an amplified state when the power switch tube is started, and controls the integrated driving chip to enable the power switch tube to be operated in a saturated switch-on state after the starting of the power switch tube is completed. By integrating the integrated driving chip with the voltage conversion unit on the driving circuit, the pulse current in the switch-on moment of the power switch tube can be lowered, and damage of the power switch tube can be avoided.

Description

technical field [0001] The invention relates to the technical field of electromagnetic heating, in particular to a driving circuit of a power switch tube in an electromagnetic heating device and an electromagnetic heating device with the driving circuit. Background technique [0002] The electromagnetic heating device in the related art usually controls the conduction of the power switch tube in a saturated state. However, the disadvantage of the related technology is that due to the presence of filter capacitors in the power supply circuit, the DC voltage rectified and filtered by the power supply circuit will be 1.4 times the AC voltage, so the power switch tube is turned on in a saturated state when starting, which will make The instantaneous pulse current of the power switch tube is too large, even exceeding its use limit, which will easily burn the power switch tube and cause excessive startup noise. [0003] Therefore, it is necessary to improve the driving technology...

AI Technical Summary

Problems solved by technology

However, the disadvantage of the related technology is that due to the presence of filter capacitors in the power supply circuit, the DC voltage rectified and filtered by the power supply circuit will be 1.4 times the AC voltage, so the power switch tube is turned on in a saturated state when starting, which will make The instantaneous pulse current of the power switch tube is too large, even exceeding its use limit, which will easily burn the power switch tube and cause excessive startup noise

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