Comparison Between Half-Wave and Full-Wave Voltage Doublers

john October 19, 2009 No Comments

Half-Wave Voltage Doubler

  • Availability of common point between input and output lines for earthing – Yes, available
  • Ripple Content – High
  • Ripple Frequency – Supply Frequency
  • Voltage Regulation – Poor
  • Maximum Voltage Across Each Capacitor – 2 Vs max
  • PIV Rating Of Each Diode – 2 Vs max

Full-Wave Voltage Doubler

  • Availability of common point between input and output lines for earthing – No, not available
  • Ripple Content – Low
  • Ripple Frequency – Twice Supply Frequency
  • Voltage Regulation – Better than that of half-wave voltage doubler
  • Maximum Voltage Across Each Capacitor – Vs max
  • PIV Rating Of Each Diode – 2 Vs max

It is seen that half-wave or full-wave voltage doubler circuits provide twice the peak voltage of the transformer secondary while requiring no centre-tapped transformer and only 2 Vs max PIV rating for diodes.

The advantage of a full-wave voltage doubler over an half-wave voltage doubler is that the output ripple frequency is twice the supply frequency and it is easier to filter high frequency ripples. The drawback of a full-wave voltage doubler is that common ground between input and output is not available.

Ripple content

Ripple frequency

Voltage regulation

Maximum voltage across each capacitor

PIV rating of each diode

Ripple content

Ripple frequency

Voltage regulation

Maximum voltage across each capacitor

PIV rating of each diode

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