Full-digital-frequency tracking inverting type electromagnetic induction heating power supply

Abstract

The invention relates to a full-digital-frequency tracking inverting type electromagnetic induction heating power supply. The traditional simulation phase-locked ring based on a chip CD4046 has the defects that the frequency tracking frame is narrower, the dynamic response is slower, the reliability is poor and the dead-area time is realized by needing an auxiliary circuit and the like. The power supply comprises a substrate (1). The substrate is provided with a voltage feedback unit circuit (2) and a current feedback unit circuit (3); the voltage feedback unit circuit is connected with a central processing unit circuit (5) by an analog-to-digital converter (ADC) (4); the current feedback unit circuit is connected with the central processing unit circuit by phase locking (6); the central processing unit circuit is respectively connected at an online testing JTAG (joint test action group) interface unit circuit (7), a reset circuit (8), an oscillating OSC (open source commerce) unit circuit (9), a frequency tracking circuit (21) and a power supply unit circuit (11); and the frequency tracking circuit is connected with an isolation driving unit circuit (20) through a buffer driving unit circuit (10). The full-digital-frequency tracking inverting type electromagnetic induction heating power supply is used for material melting of the plastic industry.

Description

Technical field: [0001] The invention relates to a device used in the field of digital power supply for material smelting in the plastic industry, in particular to an all-digital frequency tracking inverter type electromagnetic induction heating power supply. Background technique: [0002] During the heating process of the induction heating power supply, due to factors such as the increase of the load temperature and the melting of the furnace material, the effective parameters such as the load will change, which will cause the change of the natural resonance frequency of the load, reduce the active power of the electromagnetic heating power supply, and reduce the heating effect; To make the inverter work in a quasi-resonant or resonant state with a power factor close to or equal to 1, frequency tracking technology should be used in the induction heating power supply. [0003] The traditional analog phase-locked loop based on the chip CD4046 has some shortcomings such as nar...

AI Technical Summary

Problems solved by technology

[0003] The traditional analog phase-locked loop based on the chip CD4046 has some shortcomings such as narrow frequency tracking range, slow dynamic response, poor reliability, and the dead time needs to be realized by auxiliary circuits; with the continuous development of chip technology, people are gradually working on it. In the development of digital induction heating power supply based on chip control, this digital design method has the advantages of flexible design, convenient modification and easy implementation. In the field of induction heating, digital control has become a development direction

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