Questions about Fast, Ultra-Fast, Hyper- Recovery Diodes

10 Jun.,2024

 

Questions about Fast, Ultra-Fast, Hyper- Recovery Diodes

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  • Replace ultra fast recovery diode with schottky?

    When the peak reverse voltage exceeds the rating for the schottky, I would not try it. Mayby you can measure the voltage waveform across or at the input of the rectifier under varying load. Make sure that you don't create a short circuit via a probe lead or other ground connection. Note that reverse spikes can be very narrow due to the recovery characteristic of the rectifier. If your oscilloscoope has low bandwidth, you may not see the actual spike or ringing. When using shottky rectifiers, the spike may reduce significantly.

    If you don't have an oscilloscope, you can measure the negative (reverse) peak voltage with a seperate small signal fast diode (for example some 1N in series with a 47 Ohm resistor) together with a multimeter with high impedance. Maybe you need to add a 1nF capacitor parallel to your voltmeter to make sure you measure the real peak voltage.

    Questions about Fast, Ultra-Fast, Hyper- Recovery Diodes

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  • Replace ultra fast recovery diodeultra fast recovery diode with schottky?

    When the peak reverse voltage exceeds the rating for the schottky, I would not try it. Mayby you can measure the voltage waveform across or at the input of the rectifier under varying load. Make sure that you don't create a short circuit via a probe lead or other ground connection. Note that reverse spikes can be very narrow due to the recovery characteristic of the rectifier. If your oscilloscoope has low bandwidth, you may not see the actual spike or ringing. When using shottky rectifiers, the spike may reduce significantly.

    If you don't have an oscilloscope, you can measure the negative (reverse) peak voltage with a seperate small signal fast diode (for example some 1N in series with a 47 Ohm resistor) together with a multimeter with high impedance. Maybe you need to add a 1nF capacitor parallel to your voltmeter to make sure you measure the real peak voltage.