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Adjustable resonance frequency method of series induction heating power supply based on current compensation

A technology of induction heating power supply and resonant frequency, which is applied in the direction of induction heating, induction heating control, induction current source, etc., can solve the problems of large frequency change, low accuracy, large fluctuation, etc., to ensure the process level and reduce the Harmonic pollution, ensure the effect of heating depth requirements

Active Publication Date: 2021-02-05
SHANGHAI MEISHAN IRON & STEEL CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, the method of changing the resonant frequency of induction heating is mainly to change the capacity of the resonant capacitor by changing the number of capacitor columns of the resonant capacitor, and the frequency of each column of capacitance changes greatly, the accuracy is not high, and the fluctuation is large

Method used

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  • Adjustable resonance frequency method of series induction heating power supply based on current compensation
  • Adjustable resonance frequency method of series induction heating power supply based on current compensation
  • Adjustable resonance frequency method of series induction heating power supply based on current compensation

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Embodiment Construction

[0032] The present invention will be further illustrated below in conjunction with specific embodiments, and it should be understood that the following specific embodiments are only used to illustrate the present invention and are not intended to limit the scope of the present invention.

[0033] Such as figure 2 , the method for adjusting the resonant frequency of the series induction heating power supply based on current compensation in this embodiment includes a DC voltage source Uin, a single-phase inverter, a transformer, a resistor R, an inductor L, a capacitor C, a phase-locked loop, and a PI controller , a multiplier, and a controllable current source; wherein the resistance R and the inductance L are equivalent loads of the induction heating system, and are connected in series with the capacitance C to form an RLC resonant circuit. image 3 and Figure 4 It shows the output compensation current i of the adjustable capacitor when the frequency is too high or too low ...

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Abstract

The invention provides a series-type induction heating power resonant frequency adjustable method based on current compensation. The method comprises the following steps: (1), enabling a controllablepower source to output a compensation current; (2), enabling the controllable current source to output a compensation current which has the same phase as or reverse phase to a sampling current when the resonant frequency is higher or lower than a given resonant frequency; (3), injecting the compensation current at two ends of a capacitor C, and adjusting the size of the resonant frequency of an induction heating system; (4), enabling an RLC resonant circuit to work at the resonant frequency; (5), outputting a new resonant frequency value, and repeatedly carrying out the steps (1)-(5) till theend. The method can achieve the controllable heating depth, improves the heating efficiency, and improves the induction heating technology level.

Description

Technical field: [0001] The invention relates to a method for adjusting the resonant frequency of a series induction heating power supply based on current compensation, which belongs to the field of induction heating. Background technique: [0002] Induction heating technology is an advanced heating technology. It has advantages that traditional heating methods do not have, such as: high heating efficiency, fast speed, good controllability and easy mechanization and automation. Forging, welding, and surface heat treatment industries are widely used. The basic principle of induction heating for heat treatment on the surface of the strip is as follows: the strip passes through the induction coil, and a high-frequency alternating current is passed through both ends of the coil to generate an alternating electromagnetic field; affected by the alternating magnetic field, a high-frequency alternating current is generated inside the strip. Current (eddy current), eddy current gene...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H05B6/04H05B6/06
CPCH05B6/04H05B6/06
Inventor 严加根史素红冷祥洪王金华曹绪铖
Owner SHANGHAI MEISHAN IRON & STEEL CO LTD
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