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Tube DIY Asylum Do It Yourself (DIY) paradise for tube and SET project builders. |
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In Reply to: Re: Which PS would you rather listen to? posted by Thomas Mayer on May 8, 2007 at 06:44:42:
Thomas,
I'm sort of with the "there is a small amount of time where the diodes fight each other" school.Actually what happens is that this:
A diode when conducting has a depletion region of a certain width with a electrostatic field across it - that is it has a capacitance. When reversing the applied voltage you have to discharge that capacitance (the physics bods talk about sweeping out the minority carriers but its easier just to think in terms of discharging the cap). This results in a sharp peak of current FROM the power supply capacitors BACK INTO the diode before it turns off. The size of this "splat" of current depends upon the size of that intrinsic capacitor or more exactly the amount of charge in that capacitor which must be swept out to turn the diode off.
This charge is called Qrr the "reverse recovery charge" and it will not be a surprise to most of you that typical values are:
standard silicon diode - 500nC
Ultrafast Soft Recovery - 100nC
Schottky Diodes - 50nC
Silicon Carbide Diodes - less than 20nC
Tube Rectifier - 0nCCheers,
Ian
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Follow Ups
- Re: Which PS would you rather listen to? - Gingertube 16:58:05 05/08/07 (0)
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