Optimal Design of Capacitor for Branch Switch Controlled Voltage-Doubler Circuit

In this paper, a novel voltage-doubler and the optimization design method of capacitance parameters are proposed. By analyzing the operation modes of the circuit and an approximate steady state modeling calculation under condition of voltage-doubler and non-voltage-doubler. The minimum value of voltage ripple on the output DC bus voltage is approximately the same when constant power output. To ensure that the voltage ripple range of the output DC bus is within the allowable range, and then ensure that the circuit can work stably and reliably under both working conditions, reduce the voltage input range of the post stage switch converter and facilitate the analysis and design of the post stage switch converter of the circuit. Simulation results are presented to verify the rationality and feasibility of the proposed optimization design method of capacitance parameters.