DC-DC capacitor precharger
Abstract: This study evaluates the possibility of charging large capacitors to high voltages within short time frames. The system is designed to charge a capacitor of 4 mF from 0 to 850 V in one second by connecting a 24 V lead acid car battery to a flyback converter. Simulation has shown that this is possible using as little as four transistors as long as proper cooling is provided. The charge sequence could then be executed multiple times per minute. Simulation results based on three different control algorithms are presented. A prototype based on the simulations has been built and tested. The prototype managed to charge a 0.5 mF capacitor from 0 to 600 volts in one second without generating excessive heat. Noise in the circuit and lacking lab equipment hindered testing with higher power and higher voltages
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