High Power Low Voltage Pulsed Power Supply For Satellite

Solid-state radar transmitter has been widely used as it features with long service life, low power supply voltage and flexiblity. This thesis is dedicated to the development of a high power and low voltage pulsed power supply for the satellite solid-state radar system. The key issues are decreasing the output voltage drop during the pulse to guarantee a good performance of the radar system, reducing the input current ripple of the pulsed power supply to decrease the impact on the bus voltage fluctuation of the satellite power system and reducing the volume and weight of the pulsed power supply.This thesis firstly proposes the configuration of the pulsed power supply, which is comprised of a full-bridge converter and a buck/boost bidirectional converter. The bidirectional converter is connected in parallel with the output terminal of the pulsed power supply for the purpose of providing the ac components of the output power, and the voltage ripple of the storage capacitor is intentional increased for reducing the capacitance so that the volume and weight can be reduced significantly. The design of the storage capacitor and inductor in the bidirectional converter is presented. The input current ripple of the full-bridge converter is analyzed from the viewpoint of inductor branch closed-loop impedence, and the voltage and current dual closed-loop control is adopted to increase the magnitude of the inductor branch closed-loop impedence significantly, and thus the input current ripple can be reduced. The inductor current feed-forward strategy is incorporated in the control of the bidirectional converter, and thus improving the tracking ability of inductor current and decreasing the output voltage drop. The design of the voltage and current regulators for the bidirectional converter are presented.A prototype with output peak power of 2 kW and the pulsed frequency of 150Hz~300Hz has been fabricated and tested in the lab. The experimental results are presented to verify the validity of theoretical analysis. The developed pulsed power supply is proved to be able to satisfy all the requirements of the high power and low voltage pulsed satellite power supply.