Wei Kewei's editor learned from the information released by Honeywell in the UK that they designedIt is used in general for aircraft power distribution systems (EPDs), and more specifically, for systems that involve the use of solid-state power controllers (SSPCs) for power distribution and preventing damage from electrical fault conditions. SSPC technology, due to its high reliability, fast response time, ease of advanced load management, and other aircraft functions, is gaining recognition in industries such as Boeing, Airbus, and others as a modern alternative to traditional electromechanical contactors and circuit breakers.A typical SSPC includes a solid-state switch device (SSSD) that performs basic power on/off switching, and an SSPC processing engine that is responsible for SSSD on/off control and feeder protection. Although SSPCs with a rated current of less than 20 amps have been widely used in aircraft secondary power distribution systems to replace thermal circuit breakers, there are problems and challenges in their application in aircraft high-voltage direct current (HVDC) power distribution systems, including AC115V, a commonly used power voltage in aircraft. There are also concerns in the industry that using SSPCs for low-voltage products and contactors for high-voltage products carries higher risks. However, why is their promotion unfavorable?

Unlike the direct metal contacts in traditional electromechanical contactors or relays, SSSD used for higher voltage and current applications has a more significant voltage drop in the "on" state. The voltage drop of DC270V in the conducting state is much higher than that of DC28V systems. This voltage drop can lead to poor power consumption of the entire SSSD, which poses a significant challenge to the thermal design of SSSD packaging and may have adverse effects on the lifespan, size, and weight of the entire power distribution system. As a result, the difficulty of overall heat dissipation and cooling design is exponentially increased. So the design of communication involves not only the challenge of conducting voltage drop, but also the cutting off of reverse voltage. Therefore, the AC115V SSPC system is the latest mature system in the industry, because the aircraft power distribution system (EPDS) usually needs to survive without any physical damage, including when lightning strikes the aircraft, and maintain operation during and after lightning strikes. These are the mandatory requirements and usage characteristics of aircraft system design, so the safety redundancy factor of aircraft is generally high. The reason for the slow promotion of pure electronic power distribution systems is that many electrical engineers are concerned about the safety factor of this type of product. After a long period of exploration and project attempts, Weikewei's products have been upgraded and improved multiple times, with a redundancy factor of up to three times. If you need to know this information, please contact the engineer.