Design of DC Surge Suppression for Airborne Computer

Aiming at the problem of surge voltage and current under 28 V DC power supply environment of airborne computer, this paper designs two kinds of surge current suppression circuit according to the different power and a surge voltage suppression circuit. Firstly, for circuits with 50 W–100 W power, precise control of surge current peaks is not required, a MOSFET based surge current suppression circuit for airborne system is designed by using the Miller plateau effect of MOSFET. Secondly, For circuits with power less than 30 W whose surge current peaks requires precise control, a low-power current surge suppression circuit is proposed by using NPN transistor and bandgap reference. Simulations and experiments are performed on LTspice and application circuit. The simulation and experimental results show that the proposed method can achieve the surge current suppression and surge voltage suppression and have a good application value.