We always like to talk about the advantages of a product and the excellence of various parameters, but often one thing has two sides,Disadvantages of Solid State Power Controller SSPCIt also exists because of the special nature of onboard equipment, the special requirements of aviation systems, and the high standards of environmental parameters used, which pose significant challenges to the design of SSPC based EPDs. SSPCs typically contain electronic circuits that may cause excessive transient voltage damage or disturbance due to poor (or interfering) tripping caused by lightning strikes.

The main concerns include the following aspects: 1. The increasing use of composite materials in aircraft fuselage exacerbates this situation. Because when DC SSPC is connected to high-capacity capacitive loads, the peak surge current may be very high. This is particularly true for SSPCs used in high-voltage DC primary distribution systems, as in this system, large energy storage components are directly connected to the DC power bus and multiple downstream SSPC channels are simultaneously opened during the power on process. If there is excessive excitation surge, it can cause stress on electrical components during power on, thereby shortening their service life, potential electrical hazards, and EMI issues. 2. The leakage current related to high-voltage direct current SSPC and the "fault shutdown" nature of SSSD are key issues for the safety of SSPC applications. When the SSPC channel is in the "open" state, ground maintenance personnel may come into contact with the open end of the power channel and be at risk of physical harm due to the possibility of excessive leakage current. This potential safety risk may arise during maintenance activities, such as replacing aircraft loads connected to SSPC channels with excessive leakage. In addition, the inherent "fault shutdown" property of SSSD may be a safety issue. This issue has become a key element of commercial aircraft SSPC technology certification, therefore, secondary protection measures are usually required. If SSPC is used for control and fault protection of aircraft EPDS, the vulnerabilities of SSPC are alleviated. Especially, we need an EPD based on SPPC that minimizes voltage drop, minimizes safety risks caused by leakage current, minimizes the risk of interference tripping caused by lightning strikes, and minimizes the risk of damage caused by high surge currents.

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