Research On The Control Technology Of High Voltage Charging Power Supply With Primary Energy Storage

With the development of power electronics technology, high voltage pulse power technology, the primary energy storage technology and modern control theory, application of capacitor charging power supplies(CCPS) is growing into high power, integrated and digitize. Research on the Control technology of High Voltage Charging Power supply with primary energy storage is mainly used for pulsed power system, which provides electric energy to high voltage capacitor. While the high voltage power supply has charged the capacitor into full power, the short circuit discharge will produce high power pulse.For the buck-boost converter, the mathematical models of a dual loop controllers based on the switching network are derived. Analyzing the simulation and experimental results, we find that the dual loop has good dynamic and steady state performance. In order to further improve the performance of the buck-boost DC/DC switch in the startup process, this paper presents a method of soft start. This paper would prove that the open-loop soft start is easy to achieve, which can decrease the overshoot and adjustment time; it also can prove that the close-loop soft start could make the transition between the startup and PI regulation smoothly.For the series resonant converter CCPS, we choose to use Constant current charging method to limit the damage to the high voltage capacitor. For the high efficiency and safe charging on the CCPS, PFM (Pulse frequency modulation) and the Constant current control strategy is applied in system.In the last part, the brief description of main parameters of experiment platform, and the digital control process is given. Finally, this paper proves that the control parameter is reasonable and the overall design is feasible by the experimental platform.