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When a digital project has to work with AC mains a Transformer is used to step-down the voltage (in our case, to 24V or 12V) and then convert it to DC by using a rectifier circuit. So there is no evident flow of the current. 5. This rectifier circuitry used a centre-tapped transformer for the conversion of the alternating current into the direct current. Peak Inverse Voltage (PIV) of  Centre-Tap Full Wave Rectifier. There are some advantages of center tapped full wave rectifier which are given below, The rectification efficiency is twice than that of a half wave rectifier. Full wave Center Tapped Rectifier operation: Because of the fact that a The Center Tapped Rectifier use a center tapped transformer in its circuit that is why it is named as Center Tapped Rectifier. In order to obtain the purest form of DC, the rectified output must be connected to the filter circuit. The center tapped full wave rectifier uses a center tapped transformer to convert the input AC voltage into output DC voltage. By using a transformer with a presence of wire at the secondary winding it makes the transformer center tapped. This is the Self-test in Chapter 2: Diodes and Applications from the book Electronic Devices Conventional Current Version, 9th edition by Thomas L. Floyd. For a full wave rectifier, the maximum possible value of rectification efficiency is 81.2 % while that half wave rectifier is 40.6 %. For a full wave rectifier, the maximum possible value of rectification efficiency is 81.2 % while that half wave rectifier is 40.6 %. These filters can be either capacitors or inductors. The rectification efficiency is twice than that of a half wave rectifier. Thus, the diode D2 will be forward biased and D1 will be reverse biased. The input voltage is coupled through the transformer to the center-tapped secondary. Hence both the cycles are utilized and the output after rectification is obtained it must be in the form of DC. In the case of centre-tap full wave rectifier, only two diodes are used, and are connected to the opposite ends of a centre-tapped secondary transformer as shown in the figure below. eval(ez_write_tag([[250,250],'circuitstoday_com-medrectangle-4','ezslot_6',109,'0','0']));               PIV of D1 = 2Vm, The instantaneous value of the voltage applied to the rectifier can be written as, Assuming that the diode has a forward resistance of RFWD ohms and a reverse resistance equal to infinity, the current flowing through the load resistance RLOAD is given as. The ripple factor is much less than that of half wave rectifier. The reason why this type of full-wave rectifier is called a center-tapped rectifier is because it uses a center-tapped transformer. In a center-tapped transformer the peak inverse voltage is twice as in bridge rectifier hence this transformer is commonly used in full wave rectifier circuits. The concept of additional wire has been introduced in this type of transformer. Our webiste has thousands of circuits, projects and other information you that will find interesting. This is basically an improvement over half wave rectifier in which output current only flows for the positive half cycle of input supply. A centre-tapped transfomer with two rectifier diodes produces exactly the same pulsating DC output as a bridge rectifier (using four diodes) on a non centre-tapped transformer secondary. There is no loss in power because both the cycles are utilized during rectification. When the voltage comes at secondary winding from the input windings it distributed into the 2 parts first one is positive and other is negative. When bridge rectifiers peak output voltage and the peak input voltage are equal. The first method makes use of a centre tapped transformer and 2 diodes. Center tap full wave rectifier’s peak output voltage is half of the peak input voltage. Full Wave Bridge Rectifier In Full Wave Bridge Rectifier, an ordinary transformer is used in place of a center-tapped transformer.The circuit forms a bridge connecting the four diodes D 1, D 2, D 3, and D 4.The circuit diagram of the Full Wave Bridge Rectifier is shown below. We have already discussed the Full Wave Bridge Rectifier, which uses four diodes, arranged as a bridge, to convert the input alternating current (AC) in both half cycles to direct current (DC). It is a type of full wave rectifier. With Resistive Load Figure 1(a) shows the schematic diagram of the full-wave rectifier using a transformer with a center-tapped secondary. In half wave rectifier, the conversion of Alternating Current (AC) into Direct Current (DC) is not efficient.Half wave rectifier allows either positive half cycle or negative half cycle of the input AC signal and the remaining half cycle is blocked. Rheostat – Working, Construction, Types & Uses, RFID Reader and Tag – Ultimate Guide on RFID Module. Centre Tapped Rectifier In this, the anodes of the diodes are connected with Centre tapped secondary winding, and the cathodes of the diodes are connected with the load resistor. This is the reason it is termed as a Center Tapped Full Wave Rectifier. If we need to rectify AC power to obtain the full use of both half-cycles of the sine wave, a different rectifier circuit configuration must be used. And bridge rectifier don’t need center tap rectifier. During the positive half-cycle of the AC voltage, terminal 1 will be positive, centre-tap will be at zero potential and terminal 2 will be negative potential. 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