Half-wave rectifier

A half-wave rectifier is able to provide only a unidirectional d.c, power source which may also contain many a.e, ripples (Figure 6.24(a)).. A full-wave rectifier is employed to reduce such ripples, on the one hand, and provide a d.c, pow cr in forward as well as reverse directions, on the other.. A fixed forward and reverse d.c. power is required for an inverter unit when it is employed to control an a.e. machine. Now tin uncontrolled rectifier unit is adequate as and / conirt) is obtained through the inverter unit. 

EXERCISE E-E Run a power supply using a half-wave rectifier and a regulator. Use the same circuit as on page 350, except use a half-wave rectifier instead of a full-wave rectifier. The remainder of the circuit should be the same. 

Capacitors are used to store electric energy, especially for shorter periods of time, and substitute -> batteries in some cases. They smooth the output of full or half-wave rectifiers in power supplies or are part of electric frequency - filters. 

To determine the effect of alternating and direct current, an RCA CR 212 half-wave rectifier was added to the circuit, plus a resistance... 

AC, DC, Impulse Conversion of OK to CjHi Impulse discharge (half-wave rectified AC) is more efneieni than AC or DC disdiarges E. J. B. Willey, Trans. Faraday Soc, 30.230-248... 

FIGURE 10.14 Half-wave rectifier (a) circuit diagram, (b) input and output waveforms. 

The fuU-wave rectifier utilizes both halves of the input sinusoid one possible implementation is shown in Fig. 10.15(a). The fuU-wave rectifier consists of two half-wave rectifiers connected to a load R. The secondary transformer winding is center tapped to provide two equal voltages Vi for each half-wave rectifier. When the node A is at positive polarity V with respect to node B, D1 will be forward biased and D2 will be reverse biased. Therefore, diode D1 will conduct and the current will flow through R back to the center tap of the transformer. When the node B is at positive polarity Vi with respect to node A, D2 will be forward biased and diode D1 will be reverse biased. The current conducted byD2 will flow through R and back to the center tap. The current through R is always in the same direction... 

The ripple factor for a full-wave rectifier is significantly less than that of a half-wave rectifier. 

Consider a diode half-wave rectifier with a filter capacitor C and a resistor R as shown in Fig. 10.21(a). When the input voltage V) is positive, the diode conducts and charges the capacitor C. When the diode moves into cutoff, the capacitor discharges through the rest of the cycle untQ the time at which V) exceeds the voltage at the capacitor. The output waveform for the rectifier with a capacitor is shown in Fig. 10.21 (b). The ripple volts e W is given by... 

The output capacitor C1 can be treated in a similar manner as a capacitive-input type filter. C1 is chosen so that it is large enough to supply the full load current for the entire half-cycle until the time when the half-wave rectified output rises high enough to forward bias diode Dl. The secondary current then provides the current to the load as well as replenishing the charge lost by capacitor C1 when it supplied the full load current. 

Half-wave rectifier A circuit or device that changes only positive or negative half-cycle inputs of alternating current into direct current. 

Fig. 14.5 A half-wave rectifier, becoming full-wave when the dashed line wires are attached.

Initially, the "switch is closed," (really just a clip lead attached), applying a IK load. When plugging into the 120V wall socket, just one diode is used, and half-wave rectified dc fills the capacitor, as was done in the previous chapter. The meter reads about +5.5 volts. 

Half-power point, 122 Half-wave rectifier, 155 Harmonics, 142, 182 Haywire circuits, 62 footnote Hearing, human, 44, 121 Heat, 61, 101, 212, 236 effect onR, 147, 150 sink, 160, 174 Henry, 113 hfe, 172... 

A circuit element that has a large resistance with a negative applied voltage and virtually zero resistance with a positive applied voltage makes an ideal rectifier for converting AC to DC. Figure 21.10 shows a simple half-wave rectifier circuit. 

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