Full-Wave Voltage Doubler
The circuit diagram for a full-wave voltage doubler is given in the figure shown below. During the positive cycle of the ac input voltage, diode D1 gets forward biased and so conducts charging the capacitor C1 to a peak voltage Vsmax with polarity indicated in the figure, while diode D2 is reverse-biased and does not conduct.During the negative half-cycle, diode D2 being forward biased conducts and charges the capacitor C2 with polarity shown in the figure while diode D1 does not conduct. With no load connected to the output terminals, the output voltage will be equal to sum of voltages across capacitors C1 and C2 that is, VC1 + VC2 or (Vs max + Vs max) or 2 Vs max. When the load is connected to the output terminals, the output voltage VL will be somewhat less than 2 Vs max. The input voltage and output voltage waveforms are also shown in the figure below.
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