Inrush Current Suppression Circuit with Discharge Function for Airborne DC Power Supply

2022 IEEE 4th International Conference on Circuits and Systems (ICCS) Pub Date : 2022-09-23 DOI:10.1109/ICCS56666.2022.9936504

Wen Wang, Lunbo Deng, Guohua Zhou, Jianming Lv

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Abstract

High-capacity bulk capacitors are necessarily set at the input terminal of power electronics equipment to meet the electromagnetic compatibility (EMC) test. However, there is an inrush current flowing the bulk capacitor during equipment startup, which is likely to trigger protection of running equipment. In this paper, the requirements of start-up inrush current in relevant standards for airborne DC power supply are introduced, and several methods of inrush current suppression are compared. Two kinds of inrush current suppression circuits based on MOSFET are introduced and their advantages and disadvantages are analyzed in detail. In order to solve the failure problem of inrush current suppression function during hot startup, an improved suppression circuit with shutdown discharge function is proposed. The circuit can timely discharge the gate voltage of the MOSFET when the input voltage drops below the threshold, which has the advantages of low loss and high reliability. Finally, the feasibility of the circuit is verified by software simulations and experiments.

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具有放电功能的机载直流电源涌流抑制电路

为满足电磁兼容测试要求，电力电子设备的输入端必须设置大容量的体电容器。但是，在设备启动过程中，本体电容有涌流，容易触发运行设备的保护。介绍了机载直流电源相关标准对启动涌流的要求，并对几种抑制涌流的方法进行了比较。介绍了两种基于MOSFET的浪涌电流抑制电路，并详细分析了它们的优缺点。为解决热启动时浪涌电流抑制功能失效的问题，提出了一种带有关断放电功能的改进抑制电路。该电路能在输入电压低于阈值时及时放电MOSFET的栅极电压，具有损耗低、可靠性高的优点。最后，通过软件仿真和实验验证了该电路的可行性。

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2022 IEEE 4th International Conference on Circuits and Systems (ICCS)

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