Induction heating power supply and control method thereof

Abstract

The invention relates to an induction heating power supply. The induction heating power supply comprises an induction heating power supply main circuit, a control module and an alarming module; the induction heating power supply main circuit is connected with the control module and the alarming module separately; the induction heating power supply main circuit comprises a rectifying and filteringcircuit, a chopper circuit and a bridge type inversion circuit connected in sequence; the rectifying and filtering circuit is connected with a three-phase alternating current; the chopper circuit consists of a high-power insulated gate type triode IGBT (G5), an electric reactor (L1) and a filtering capacitor (C1); and the bridge type inversion circuit consists of four groups of IGBT (G1-G4), a resonance capacitor (C2) and a primary matched transformer (T). The induction heating power supply provided by the invention is high in heating efficiency, and the output power of the power supply can becontrolled by controlling the duty ratio of a chopping PWM signal through a digital algorithm; and the output frequency of the power supply can be controlled by controlling the frequency of an inversion PWM signal through a digital PID algorithm, so that high reliability, accurate heating control and high reaction speed are achieved.

Description

technical field [0001] The invention belongs to the technical field of heating power supply, and in particular relates to an induction heating power supply and a control method thereof. Background technique [0002] Most of the traditional heating methods in our country are based on coal, oil, gas or electricity, which have defects such as high energy consumption, poor working conditions, serious environmental pollution, and difficult control of process quality. However, induction heating has many advantages that traditional methods do not have. : High working reliability, no pollution, high efficiency and easy heating control, etc., widely used in industrial production processes such as metal smelting, diathermy, heat treatment and welding, etc. , aircraft, automobile manufacturing and other indispensable technical means. With the development of industry, the application of induction heating power supply is becoming more and more extensive. At present, induction heating po...

AI Technical Summary

Problems solved by technology

[0003] The traditional induction heating power supply control system uses analog electronic circuits composed of discrete components, which have disadvantages such as complex circuits, difficult adjustment of control parameters, zero drift and aging, and poor versatility. With the emergence of digital integrated chips, single-chip microcomputers, DSPs, and FPGAs, Making intelligent control of induction heating equipment a trend

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