Bidirectional booster converter with an active rectifier for charge-discharge of a battery in power systems

Authors: Osipov A. V., Shemolin I. S., Shkolnyy V. N., Latypov R. A.

Annotation: The paper considers a bidirectional booster converter with an active rectifier to charge-discharge a battery of power systems of space vehicles. It is shown that the use of an active rectifier not only substantially reduces static losses, but also allows the charging of an accumulator battery to be realized, while the rectifier operates in a current inverter mode with a rigid inclusion of transistors. In addition, the active rectifier provides linearity of the control characteristic at all loads to idling due to the possibility of energy recovery of the output filter. A method to regulate a converter is proposed, which consists in the simultaneous unlocking of all rectifier transistors to obtain the interval for the direct connection of the battery and the output filter, i.e. the inverted state of the converter, which ensures minimal static losses in this interval. The switching processes are considered, it is shown that in the booster converter with the proposed control in the discharge mode, the switching of the adjustable rack transistors occurs in a hard mode, and the inclusion of the remaining transistors of the converter is accompanied by a preliminary discharge of parasitic capacitances and occurs in the ZVS mode. In the inverter this is achieved due to the inertia of the inductor current dissipation of the transformer, and in the rectifier due to the continuity of the current of the smoothing inductor. A prototype of the converter was developed, which experimentally confirmed the conclusions drawn in the work.

Keywords: power supply system, booster converter, soft switching