## peak inverse voltage

i read this sentence like a 100 times and i still dont get it please can anyone help me??
PEAK INVERSE VOLTAGE (PIV):
PIV is the maximum reverse bias voltage which can be applied safely to a diode without its breaking down. Beyond this voltage a diode breaks down
they say the PIV must be greater than the maximum voltage of the sin form of the ac generator why????

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 Recognitions: Gold Member Science Advisor This is so that the diode will not break down when the voltage is reversed and it's supposed to be 'off' - which is what diodes are used for. (PIV refers to the Max PIV that the diode can stand - not the actual voltage you apply)

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 Quote by queenstudy i read this sentence like a 100 times and i still dont get it please can anyone help me?? PEAK INVERSE VOLTAGE (PIV): PIV is the maximum reverse bias voltage which can be applied safely to a diode without its breaking down. Beyond this voltage a diode breaks down they say the PIV must be greater than the maximum voltage of the sin form of the ac generator why????
When a rectifier diode conducts and it charges a filter capacitor, it charges the capacitor up to the full positive voltage of the input waveform (minus a small diode voltage drop).

Now, when the input polarity reverses, the diode gets a peak negative voltage on its anode, but it still has the positive voltage of the capacitor on its cathode.

So, it has roughly twice the peak input voltage across it in reverse. This voltage situation is called the peak inverse voltage and the diode needs to be able to cope with it without breaking down.

## peak inverse voltage

what about the formula PIX greater than Vm in both half and full rectification why??
thank you guys for the help

 Recognitions: Gold Member Science Advisor You cannot rely on the two reverse biased diodes sharing the applied volts equally.

Recognitions: