A multi-phase multi-coil induction heating device and method

Abstract

The invention relates to induction heating equipment with multi-phase multiple coils and a method for the induction heating equipment. The induction heating equipment comprises a main circuit, a control circuit, N coils, and magnetic cores, wherein N is a positive integer which is greater than or equal to 2; the main circuit comprises a rectifier circuit, a filter circuit and N inverter circuits; the control circuit comprises a main controller and a panel circuit which is connected with the main controller; the input end of the rectifier circuit is connected to a 200V power-frequency alternating current power supply; the output end of the rectifier circuit is connected to the N inverter circuits through the filter circuit; the N inverter circuits are correspondingly connected with the N coils; and the magnetic cores are arranged below the corresponding coils. By adoption of the induction heating equipment, the efficiency of electromagnetic heating equipment can be increased; and the temperature balance can be improved.

Description

technical field [0001] The invention relates to the field of electromagnetic heating, in particular to a multi-phase multi-coil induction heating device and method. Background technique [0002] Electromagnetic induction heating technology rises rapidly as a new type of heating technology. It relies on high-frequency alternating current to generate high-frequency alternating magnetic field, and the mechanism of eddy current generated by the workpiece placed in the high-frequency alternating magnetic field realizes rapid heating of the workpiece. So as to achieve the purpose of heating. [0003] Existing electromagnetic heating equipment such as induction cooker takes electromagnetic induction as the main principle. In the prior art, the induction cooker mainly has a "sandwich" structure, which is mainly divided into three parts: an induction coil, a magnetic core, and a pot body. In the prior art, the induction heating coil is designed as a plane spiral, and its outer diam...

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Problems solved by technology

[0005] The traditional planar spiral coil structure is simple and convenient to manufacture, but there are problems of heat uniformity and low efficiency. At the same time, a single coil uses a single drive circuit, and the switching tube used for driving has a large voltage and current, and the driving circuit, especially the switching tube, is easy to burn out.

The multi-coil structure proposed in patent ZL201320408605.5 only decomposes a single planar spiral coil into multiple small coils, which increases the difficulty of coil manufacturing and increases the height of the coil, and without electromagnetic analysis and drive circuit design, the actual effect is not necessarily ideal. Less practical

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