Purpose

This paper aims to improve the general circuit of driving and protection based on insulated gate bipolar transistor (IGBT) in dielectric barrier discharge power supply by designing a novel half-bridge inverter circuit with discrete components.

Design/methodology/approach

With one SG3524 chip, the structure based on discrete components is used to design the IGBT drive circuit. The driving waveform is isolated and sent out by photo-coupler 6N137. The protection circuit is realized by Hall sensor directly detecting the main circuit current, supplemented by a few components, including diodes, resistors, capacitors and triodes. It improves the reliability of the protection circuit.

Findings

In the driving circuit, the phase difference of signals from two channels are 180°. Moreover, when the duty cycle is set at 40%, it can ensure sufficient pulse width modulation response time. In the protection circuit, when over-current occurs, an intermittent output signal is automatically sent out. Furthermore, the over-current response time can be controlled independently. The peak voltage can be adjusted continuously from 0 to 30 kV with its frequency from 8 to 25 kHz and the power output up to 150 W.

Originality/value

The novel circuit of driving and protection makes not only its structure simpler and easier to be realized but also key parameters, such as frequency, the duty cycle and the driving voltage, continuously adjustable. Moreover, the power supply is suitable for other discharges such as corona discharge and jet discharge.

中文翻译：

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介质阻挡放电电源中的半桥IGBT驱动及保护电路

目的

本文旨在通过设计一种新型分立元件半桥逆变电路，改进介质阻挡放电电源中基于绝缘栅双极晶体管（IGBT）的驱动和保护通用电路。

设计/方法/途径

采用一颗SG3524芯片，采用基于分立元件的结构设计IGBT驱动电路。驱动波形经光电耦合器6N137隔离送出。保护电路采用霍尔传感器直接检测主电路电流，辅以二极管、电阻、电容、三极管等少数元器件实现。提高了保护电路的可靠性。

发现

在驱动电路中，两路信号的相位差为180°。而且，当占空比设置为40%时，可以保证足够的脉宽调制响应时间。在保护电路中，当发生过流时，自动发出断续的输出信号。此外，过流响应时间可以独立控制。峰值电压可在 0 至 30 kV 范围内连续调节，频率为 8 至 25 kHz，功率输出可达 150 W。

原创性/价值

新颖的驱动和保护电路不仅使其结构更简单、更易于实现，而且频率、占空比和驱动电压等关键参数连续可调。此外，该电源还适用于其他放电，如电晕放电和射流放电。