Single-Phase Voltage Multipliers

Single-Phase Voltage Multipliers

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On: 05 Nop, 2017

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These circuits use the principle of charging capacitors in parallel from the ac input  and adding the voltages across them in series to obtain dc voltages higher than the source voltage. Filtering must be of the capasitor-input type.

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These circuits use the principle of charging capacitors in parallel from the ac input  and adding the voltages across them in series to obtain dc voltages higher than the source voltage. Filtering must be of the capasitor-input type.

Conventional and cascade voltage doublers in the conventional circuit (Fig. 17), Capasitor C1 and C2 are each charged, during alternative half-cycles, to the peak value of the alternative input voltage. The capasitors are discharged i the series into load Rl, thus producing  an output across the load of the approximately twice the ac peak voltage.

in the cascade circuit (Fig. 18), C1 is charged to the peak value of the ac input voltage through rectifier CR2 during one half-cycle, and during the other half-cycle it discharges in series with the ac source through CR1 to charge C2 to twice the ac peak voltage.

The conventional circuit has slightly better regulation and since the ripple frequency is twice the supply frequency, the output is easier to filter, the percentage ripple being approximately the same in both circuits. In addition,  both capacitor are rated at the peak ac voltage , whereas C2 in the cascading circuit must be rated at twice this value. With both circuits, the peak inverse voltage across each retrifier is twice the ac peak.

The cascading circuit , however, has the advantage of a common input and output  terminal and, therefore, permits the combination of the units to give higher-order voltage multiplication. The regulation of both circuits is poor, so that only small load currents can be drawn.

Bridge rectifier or voltage doubler- if SW in Fig. 19 is open, the circuit is a bridge rectifier, if the peak ac applied voltage is 2E. the dc output voltage is 2E. if SW is closed, the circuit is used if the same dc voltage is desired and the input voltage can be either 115 or 230 volts ac.

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