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The HalfWave Rectifier With Capacitance LoadAuthor: E.E. Kimberly
If in the circuit of Fig. 273 (a) the battery is replaced by a condenser, the condenser will be charged to the peak plate voltage on the first halfcycle in which the plate is positive. Successive halfcycles of positive plate voltage will then have no effect on the potential of the condenser. If the condenser is used as a source of very small current, however, its charge will be drained off somewhat between positive halfcycles and will be restored successively by following halfcycles of positive voltage impulses. Fig. 275 shows the phenomenon of drain and recharge when the load is a highresistance resistor. The rate of drain between charging impulses follows the exponential law of discharge of a condenser through a resistor and is therefore a function of C and R.
In applications where loss of condenser voltage because of current drain is within acceptable limits, the halfwave rectifier is satisfactory and is desirable because of its simplicity. If the current drain through the load is unusually heavy, it is advisable to use a fullwave rectifier, like that shown in Fig. 273 (b), which recharges the condenser to full voltage twice as often as does a halfwave rectifier. This voltage characteristic is shown in Fig. 276.


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