提高继电器触点抗浪涌能力的一种新颖旁路保护电路

Improving the relay contact anti surge capacity of a new bypass protection circuit

在航天器用电设备中,多数器件由DC-DC模块供电,部分由一次电源直接供电,DC-DC模块作为用电负载也由一次电源供电,在DC-DC模块及星载用电设备突然加电时,有可能产生较大的启动电流,浪涌电流可达到上百安培,若不进行有效控制,有可能对供电链路中配电设备的继电器触点造成损伤,甚至导致继电器触点粘连。文中从系统实际应用的角度出发,阐述了提高继电器触点抗浪涌能力的一种新颖保护电路,能够确保规避继电器触点受到浪涌电流的冲击,满足继电器用于航天产品中高可靠性的要求。

In the electrical equipment of the spacecraft, the majority of devices are powered by the DC-DC modules, and some of the equipment are directly from the primary power source, while sometimes the DC-DC modules are supplied as the power load also by a power supply. When the DC-DC modules and on-board electrical equipment are powered up suddenly, there may be a greater start-up current. The inrush current may reach hundreds of amps, if not effectively controlled, it is possible to cause damage or even adhesion on relay contacts in the supply chain and distribution equipment. This article is based on the perspective of the practical application of the system, and a novel anti-inrush current protection circuitry is introduced to improve the ability of relay contacts, which could ensure the relay contacts to avoid the impact by the surge current and to meet the high reliability requirements for the relay for aerospace products.