The addition of still another diode-capacitor section to a Voltage trippler, as shown in Below Figure, produces an output four times the peak secondary voltage. C4 charges to 2Vp through D4 on a negative half-cycle. The 4Vp output is taken across C2 and C4, as shown. In both the tripler and quadrupler circuits, the PIV of each diode is 2Vp.

Full Wave Voltage Doubler using Diodes
Voltage multipliers use clamping action to increase peak rectified voltages without the necessity of increasing the transformer’s voltage rating. Multiplication factors of two, three, and four are ...