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Description
A passively balanced, bipolar high voltage power supply was created to drive a compact pulsed power system. The supply was designed to average 100 kW when charging a capacitive load to ±50 kV with a total volume of less than 15 L. The supply is sourced from a low-ESR ultra-capacitor bank charged to 285 V and operates with runtime durations less than a few seconds. The converter employs a novel high turn ratio, low leakage inductance transformer to achieve a resonant impedance less than 200 mΩ at a switching frequency of 20 kHz. The step-up transformer output is converted to a balanced bipolar output by a dual polarity diode multiplier circuit with a common ground reference. The resonant converter is based on an LCL-T configuration and operates in constant current mode. Design details and experimental measurements of the converter will be presented.
