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Low-Cost Three-Phase Voltage Doubler Circuit

IP.com Disclosure Number: IPCOM000101001D
Original Publication Date: 1990-Jun-01
Included in the Prior Art Database: 2005-Mar-16
Document File: 2 page(s) / 51K

Publishing Venue

IBM

Related People

Smith, FK: AUTHOR [+2]

Abstract

Power supplies requiring high voltage at low average power levels can beneficially utilize the classical voltage doubler circuit to provide a low-cost design. For pulse power applications where the average energy demand is modest and size or cost is controlled, a doubler feeding a capacitor bank is a good choice. Pulse applications can demand energy pulses that are relatively large; however, due to their very brief duration, the total power demand is small.

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Low-Cost Three-Phase Voltage Doubler Circuit

       Power supplies requiring high voltage at low average
power levels can beneficially utilize the classical voltage doubler
circuit to provide a low-cost design.  For pulse power applications
where the average energy demand is modest and size or cost is
controlled, a doubler feeding a capacitor bank is a good choice.
Pulse applications can demand energy pulses that are relatively
large; however, due to their very brief duration, the total power
demand is small.

      In three-phase power applications, the multiple phases increase
the ripple frequency by a factor of three.  The filtering required to
achieve good smoothing of the direct current output is reduced by
this factor.  Operating a doubler on three phase also reduces the
capacitor size needed to achieve a given level of output filtering.

      The attached circuit diagram shows a standard three-phase wye
power source and (six diode) three-phase rectifier stack to provide a
voltage doubler.  With only three electrical components, it is
possible to multiply the line-to-neutral voltage by a factor of two.
This arrangement brings out the neutral conductor of the wye to the
mid- point of the capacitor stack to complete the doubler function.

      The doubler design shown provides both a plus and minus voltage
output terminal that are centered about the neutral conductor
potential.  An additional benefit of this design is that both a plus
and minus o...