Series Asymmetrical Half-Bridge Converters with Voltage Auto Balance for High Input-Voltage Applications

In this paper, an isolated Series Asymmetrical Half-Bridge Converters is proposed to satisfy the high power and high input-voltage requirements. In the proposed converter, two half-bridge modules with series configuration are adopted in the primary side to reduce the switch voltage stress to half of the input voltage. Moreover, the series half-bridge cells share the same transformer and leakage inductance, which simplifies the circuit structure. Zero-voltage-switching transition is achieved for all the active switches. Furthermore, the voltages of the input capacitors are automatically balanced without any additional components or complex control methods. In addition, a family of DC-DC converters with series half-bridge structure is explored to give extensive applications of the proposed contributions for the high input-voltage system.