A High Voltage Low Ripple Voltage Multiplier Circuit and Its Characteristics Analyses

The ripple voltage and voltage drop of Cockcroft-Walton voltage multiplying rectifiers are affected by the square or cube of stage number respectively. When increasing the number of the stage, the ripple voltage and voltage drop would significantly increase. For overcoming this problem, the proposed circuit adopts phase shift superposition to realize 2N time voltage multiplier circuit. By using three-phase transformer composed by three independently single phase transformer, output winding is connected to DC double voltage circuit. 12 times voltage circuit is built by parallel input, serial output to realize 6 pulses periodic superposition. Through the overlay, the ripple is greatly weakened. The theoretical analysis is made for ripple and voltage drop, and comparisons to the typical and symmetrical Cockcroft-Walton multistage voltage multiplier circuit are carried out. Results show that the circuit can significantly reduce the voltage ripple and voltage drop, and significantly shorten the output voltage steady set up time.