What Happens When Input Voltage Exceeds PIV in a Half-Wave Rectifier?

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Exceeding the peak inverse voltage (PIV) in a half-wave rectifier can lead to significant issues, including potential damage to the diode and other components like the transformer. The PIV for a single-diode setup is twice the peak input AC voltage. If the diode fails due to excessive voltage, it may short circuit, risking further damage and possibly causing a fire. Conversely, if the diode opens, the output DC voltage will drop to zero, which can occur even without exceeding the specified PIV. Understanding these risks is crucial for ensuring the safe operation of rectifier circuits.
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Was wondering what would happen to the output voltage when the input voltage exceeds the PIV/PRV.
 
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pupul07 said:
Was wondering what would happen to the output voltage when the input voltage exceeds the PIV/PRV.

Could you please define your terms, and maybe provide a datasheet for a part? Is PIV peak inverse voltage?
 
For a single-diode half-wave rectifier going into a capacitor filter, the peak repetitive inverse/reverse voltage on the diode is TWICE the peak input ac voltage. If you exceed the PIV/PRV and short the diode, you could damage other components (transformer, etc.) and maybe start a fire. If the diode opens up, your output dc voltage goes to zero. This could even happen if you don't exceed PIV/PRV.

Bob S
 
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