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In a half-wave power supply with a capacitor input filter and a load drawing little or no current, the peak inverse voltage (PIV) across the diode can reach _____ times the RMS voltage.
2.8
Under no-load conditions with a capacitor input filter, the capacitor charges to the peak of the AC waveform (Vpeak = Vrms × √2). During the non-conducting half-cycle, the diode sees the sum of the peak transformer voltage and the charged capacitor voltage, which can approach 2 × Vpeak, or 2.8 × Vrms.
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