Abstract:

The harm of surge voltage to DC-DC power supply is studied.A surge suppression circuit with equal voltage function and high surge voltage is presented to overcome the shortcomings of low output power and low surge protective voltage of the traditional surge suppression circuit.By replacing a single surge suppressor switch with multiple series switch array,the surge control circuit not only realizes the voltage and current surge suppression,but also enables all switches to achieve automatic voltage equalization,which improves the ability to suppress peak voltage,and the loss is evenly distributed to each switch,greatly increasing the suppression of the circuit surge.An experimental circuit is designed.Both the simulation and test results show that the circuit can meet design specifications.

Key words: DC power, surge protective device, automatic voltage sharing, surge current suppression