**Dc Voltage Doubler Circuit**

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3.20 VOLTAGE MULTIPLIER CIRCUITS 1 Introduction Voltage multipliers are special class of AC/ DC converters manlyaused to convert AC supply to higher DC voltages than obtained by conventional Rectifier circuits. The high voltage low current voltage multipliers are mainly used in CROs, TV picture tubes, video display units, flash gun used in photography, particle accelerators, Xray equipment and so on. It is not easy to boost up DC into high DC voltage. So, the high DC To compensate for the dc voltage reduction, a pi (71) type of filter can be used. Figure 222 shows this type of filter. The advantage of the choke coil (Lj) over the resistor (Rj) of the RC filter is that it offers only a small dc series resistance, but it passes dc and blocks.the ac component of the rectified voltage. Several sections of this type of filter can also be used to further reduce ac ripple. VOLTAGEMULTIPLIER CIRCUITS The purpose of a voltage multiplier circuit is to increase the value 6.25 Determine the ripple voltage and regulation of a 10 stage Cockcroft Walton type dc voltage multiplier circuit having a stage capacitance = 0.01 /iF, supply voltage = 100 kV at a frequency of 400 Hz and a load current = 10 mA. 6.26 A voltage doubler circuit has C, = C2 = 0.01 /iF and is supplied from a voltage source of V = 100 sin 314 t kV. If the dc output current is to be 4 mA, calculate the output voltage and the ripple. 6.27 The primary and secondary winding inductances of a 6.4.3. Voltage. Doubler..Circuit. Both fullperiod and halfperiod rectifier circuits produce a dc voltage less than the ac maximum voltage. A voltage doubler circuit produces a dc voltage almost double the peak ac voltage under the loaded condition. One such doubler circuit is shown in Fig. 6.22. The circuit has been named after its creator Greinacher, a young physicist. D A B Voltage converters The 555 can easily be used to convert an existing d.c. voltage into one of greater value or of reversed polarity, or into an a.c. voltage. Figures 11.25 to 11.30 show various circuits of such converters. 5 to 15 V +ve (Vcc ) : R1 : 3k3 4 8 1 00 % 2 Out R2 # # 555 + £ V 3: * VCc x 2 18k : | C, 1 U 10 u (10 V to 30 V) 7 C2 – 1 5 C /Wote: 10 n T T iên D1–D2.= 1 N4148 0 V Figure 11.25 d.c. voltagedoubler circuit Figure 11.25 shows the 555 used as a d.c. voltage doubler Voltage doubler circuit is shown in Fig. 3.22. A voltage multiplier is a rectifier circuit that gives a D.C. output voltage approximately equal to a multiple of the peak input A.C. voltage. Fig. 3.22 Voltage doubler circuit. Figure 3.22 shows the circuit diagram of a halfwave voltage doubler. During the negative half cycle of the input A.C. voltage when the point b is at a positive potential with respect to the point a the diode D\ conducts and charges the capacitor C\ to the peak voltage VP of the Diodes, along with capacitors, also can be used as voltage multipliers. A voltage multiplier is used to change AC to.pulsating DC and increase the output voltage of a circuit. Voltage multipliers are used in lowpower circuits where transformers are impractical or too costly. Although stepup transformers can be used to increase the output voltage of a circuit, transformers can't change AC to DC. Voltage multipliers are also used in highvoltage DC applications, including cathode ray tubes power supplies where the efficiency is improved because there is only one diode in series with the output SinglePhase Full Wave Bridge Rectifier— If singlephase fullwave output is required, a bridge circuit is commonly used. Efficiency is ThreePhase Wye (or Star) HalfWave Rectifier — This circuit is commonly used if dc outputvoltage requirements are relatively.low and current requirements are moderately large. The dc Bridge Rectifier or Voltage Doubler— If SW in Fig.Such circuits are useful only when the load current is very small. Halfwave voltage doubter A halfwave voltage doubler circuit is shown in Fig. 18.15, where C^ and D, together behave like a clamper and the clamped output voltage V, has a peak value of 2Vm and V, will not become negative. The voltage V, is a sine wave with Vm as the average value. Diode D2 acts as a rectifier and capacitor C2 acts as a filter. The output d.c. voltage V0 is 2Vm, with a ripple frequency equal to that of 4.6 Voltage Multipliers As mentioned earlier, voltage multipliers are used to step up the output voltage level to two, three or more times.the peak voltage of the input. Such circuits use clamping action. Such circuits can be used in bridge rectifiers to increase the level of output d.c. voltage. 4.6.1 Half Wave Voltage Doubler Fig. 4.38 shows the circuit diagram of a half wave voltage doubler which gives d.c. voltage output equal to 2 Vm where Vm is the maximum value of the input a.c.