| 摘要 |
A full-wave rectifier, two resistors forming a voltage divider across the rectifier outputs and a capacitor in parallel with one of the resistors, provide an output across the capacitor that approximates the RMS equivalent of an input signal to the rectifier. The capacitance value may be selected to attenuate certain AC components without significantly affecting the accuracy of the RMS approximation. The shape of the input-signal-may be rectangular, trapezoidal, sinusoidal, triangular, random, constant DC, or a combination thereof, without affecting conversion accuracy. A DC voltage charge is maintained on the capacitor, which has been charged via the voltage divider, to a proportionally scaled equivalent of the RMS voltage of the input signal, through switched, non-symmetrical charge/discharge paths of the rectifier and the resistors.
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