Study on Half-Bridge Voltage Balancing Circuit with Two Driving Methods

A voltage balancing circuit not only can split a two-wire dc grid into a three-wire dc grid, but also can balance the voltages of series capacitors or battery packs. A half-bridge voltage balancing circuit is a simpler topology and is widely introduced. But it has not been deeply analysed. Thus, in this paper the balancing circuit with the complementary driving method is studied in detail, firstly. Secondly, for avoiding the reactive current occurred in the complementary driving method, the unipolar current driving method is also proposed. Finally, the prototype is implemented in the lab, and the simulation and experimental results verify the analyses.