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Atmospheric pressure glow discharge control method and its circuit based on pulse density modulation

A technology of pulse density modulation and glow discharge, which is applied in the direction of electrical components, output power conversion devices, plasma, etc., to reduce switching loss and reduce reactive power

Inactive Publication Date: 2006-11-08
ZHEJIANG UNIV
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  • Abstract
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Problems solved by technology

The atmospheric pressure glow discharge load is a capacitive load with nonlinear changes, and in order to meet the requirements of ion capture, the amplitude and frequency of the external excitation voltage and the distance of the discharge air gap must meet a certain relationship, so as to realize the glow discharge under atmospheric pressure. All of these increase the complexity of the design of the atmospheric pressure glow discharge power supply control scheme

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  • Atmospheric pressure glow discharge control method and its circuit based on pulse density modulation
  • Atmospheric pressure glow discharge control method and its circuit based on pulse density modulation
  • Atmospheric pressure glow discharge control method and its circuit based on pulse density modulation

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Embodiment Construction

[0010] The atmospheric pressure glow discharge circuit based on pulse density modulation of the present invention includes two parts, the main circuit and the control circuit, the main circuit such as figure 1 As shown, it includes a three-phase uncontrolled rectifier circuit 1, a full-bridge inverter circuit 2 composed of switching tubes Q1-Q4, and a step-up transformer 3.

[0011] control circuit such as figure 2 As shown, it includes a phase-locked loop circuit 7 composed of a phase detector 4, a first low-pass filter 5 and a voltage-controlled oscillator 6, a monostable circuit 8, a current detection circuit 9, a two-frequency division circuit 10, and a time delay Circuit 11, frequency divider 12, second low-pass filter 13, density setting 14, comparator 15, electronic switch 16, separate excitation frequency setting 17, dead zone forming circuit 18, synchronous circuit 19 and logic circuit 20, One output terminal of the current detection circuit 9 is connected with the ...

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Abstract

Present invention discloses pulse number modulation based atmospheric pressure glow discharge control method and circuit. Control method adopts pulse density modulation to generate alternate presented square wave pulsing signal to control inversion circuit switch tube on / off in glow discharge main circuit, each working period containing fixed quantitative square wave pulse, through keeping working period unchanged and changing working period square wave pulse number to control inversion circuit feeding energy time to load, realizing atmospheric pressure glow discharge load fixed frequently constant voltage control. The present invention can realize frequency follow-up control and linear power regulation to atmospheric pressure glow discharge type nonlinear variational capacitive loading.

Description

technical field [0001] The invention relates to a control method of atmospheric pressure glow discharge and a circuit thereof, in particular to a control method of atmospheric pressure glow discharge based on pulse density modulation and a circuit thereof. Background technique [0002] Atmospheric pressure glow discharge has the advantages of long-term discharge, uniform discharge, and no local high energy. Therefore, it can avoid damage to the surface of materials during the process of processing and modifying materials, and has a wide range of application prospects. Among the existing realization methods of atmospheric pressure glow discharge, ion trapping technology is more suitable for industrial application. It can use ordinary dielectric barrier discharge electrode mechanism, without special devices and equipment, and without adding other discharge gases, it can generate a large area of ​​glow discharge in the air under atmospheric pressure. Currently, the ion trappin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05H1/24H02M5/458
Inventor 何湘宁刘勇
Owner ZHEJIANG UNIV
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