**Ac Voltage Multiplier Circuit**

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Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online.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 Provides a comprehensive treatment of high voltage engineering fundamentals at the introductory and intermediate levels.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 Figures 1.26–28 show various ways of connecting diodes and capacitors to make effective A.C. voltage multiplier circuits that give a D.C. output equal to some multiple of the peak voltage value of an A.C. input signal. Although these circuits.look rather complicated, their operation is in fact quite simple. Thus, the 'voltage doubler' circuit of Figure 1.26 in fact consists of a simple C1D1 clamping diode network (like Figure 1.20a), which gives an A.C. output with a peak value equal to the A voltage multiplier is a specialised rectifier circuit producing a dc output which is theoretically an integer times the ac peak input, for example 2, 3 or 4 times the ac peak input. Thus, it is possible to get 200 V dc output from a 100 Vpeak ac source using a doubler, 400 V dc from a quadrupler and so on; however, the current level remains unchanged. A voltage multiplier finds its application in areas like television (TV) sets where a large dc voltage supply is required.(colour TV sets use 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 2005; Papotto et al. 2011), and 10–35 GHz for UPS (Utility Power Satellite) (Gutmann and Borrego 1979; Yoo and Chang 1992) in space. In addition, the voltage gain, i.e., the ratio of output DC voltage to input.AC voltage amplitude, needs to be as low as a few in an application or greater than ten in another. Thus, a circuit model for AC–DC voltage multiplier needs to cover wide operating frequency and voltage gain ranges. Figure 4.1a shows a block diagram of AC–DC charge Such circuits can be used in bridge rectifiers to increase the level of output d.c. voltage. The various voltage multiplier circuits are, 1. Voltage doubler. 2. Voltage tripler 3. Voltage quadrapler Each circuit is further classified as, a. Half wave multiplier and b. Full wave multiplier. 1.11.1 Half Wave Voltage Doubler The Fig. 1.93 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. voltage.This condition is identical to the clamping circuit. The condition implies that the RC time constant is much larger than the periodic time of input ac. A light load on the multiplier circuit means large load resistance. If the load resistance is small, the capacitors will discharge appreciably into load resistance and the output voltage will drop. This results in poor load regulation of voltage multiplier circuits. Secondly, the voltage drops across the conducting diodes are responsible for charging