Wide band induction heating power supply based on resonance frequency tracking

A technology of induction heating power supply and resonance frequency, which is applied in the direction of induction heating, induction current source, output power conversion device, etc., can solve the problems of low precision, many peripheral components, slow resonance frequency search, etc., and achieve frequency bandwidth and precision High, enhanced frequency discrimination accuracy, fast resonant frequency search effect

Inactive Publication Date: 2018-11-06
CHINA JILIANG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In order to overcome the shortcomings and shortcomings of the existing resonance frequency tracking technology, such as many peripheral components, slow resonance frequency search and low precision, the present invention provides a broadband induction heating power supply based on resonance frequency tracking

Method used

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  • Wide band induction heating power supply based on resonance frequency tracking
  • Wide band induction heating power supply based on resonance frequency tracking
  • Wide band induction heating power supply based on resonance frequency tracking

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Embodiment Construction

[0039] In order to make the purpose of the present invention, technical solutions and advantages clear, the present invention will be further described below in conjunction with the accompanying drawings:

[0040] Such as figure 1 As shown, a resonant frequency tracking technology of broadband induction heating power supply includes: rectification filter circuit, full bridge inverter circuit, impedance matching transformer, resonant circuit, zero-crossing comparison circuit, all-digital frequency tracking controller and full bridge drive circuit .

[0041] The rectifier filter circuit includes four rectifier diodes D s1 、D s2 、D s3 、D s4 and electrolytic capacitor C d , where D s1 and D s2 The P poles are connected to the D s3 and D s4 The N poles form points A and B, and D s1 and D s2 The N pole is connected to point C, D s3 and D s4 The P pole is connected to point D, and the filter capacitor C d The positive and negative poles of the module are connected to po...

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Abstract

The invention discloses a wide band induction heating power supply based on resonance frequency tracking. The wide band induction heating power supply comprises a rectifier filter circuit, a full-bridge inverter circuit, an impedance matching transformer, a resonant circuit, a zero-crossing comparing circuit, a full-digital frequency tracking controller and a full-bridge driving circuit; the full-digital frequency tracking controller is composed of a digital phase discriminator, a digital filter and a digital oscillator; the digital phase discriminator is composed of a shaping filter and a phase comparator; and the digital oscillator is composed of a phase difference frequency word controller, a reference frequency word controller, a phase angle threshold controller, a frequency word controller and a direct digital synthesizer. The wide band induction heating power supply adopts the full-digital frequency tracking controller and has the characteristics of quick resonance frequency search, wide frequency band and high precision; and the wide band induction heating power supply adopts the shaping filter to conduct shaping on signals representing the load voltage and the current phase, the influence of high-frequency jitter noise on the phase comparator is reduced, and the anti-jamming ability of a system is enhanced.

Description

technical field [0001] The invention belongs to the technical field of power electronics, and relates to a broadband induction heating power supply applied to pulsed eddy current thermal imaging, which has high-precision, all-digital resonant frequency tracking technology. Background technique [0002] Pulsed eddy current thermal imaging detection technology combines pulsed eddy current and infrared thermal imaging two non-destructive detection technologies. It has the characteristics of non-contact, large detection area, high efficiency and intuitive detection results. It has been successfully applied in aerospace, transportation, nuclear power reaction, etc. Non-destructive testing and performance evaluation of metallic materials in the field. This technology mainly includes: induction heating power supply, infrared detector and data processing algorithm, among which the induction heating power supply is the most important part of the system, and the characteristics such a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M5/458H02M1/088H05B6/04
CPCH02M1/088H02M5/458H05B6/04H02M1/0009H02M1/0012Y02B70/10
Inventor 方旭王同辉叶树亮唐波侯德鑫
Owner CHINA JILIANG UNIV
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