Peak Inverse Voltage
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Peak Inverse Voltage (PIV) or Peak Reverse Voltage (PRV) is the maximum value of reverse voltage which occurs at the peak of the input cycle when the diode is reverse-biased.
The portion of the sinusoidal waveform which does not repeat or duplicate itself is known as the cycle. The part of the cycle above the horizontal axis is called the positive half-cycle, or alternation; the part of the cycle below the horizontal axis is called the negative alternation.
With reference to the amplitude of the cycle, the peak inverse voltage is specified as the maximum negative value of the sine-wave within a cycle's negative alternation.
