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Re: Rebuilding a bridge rectifier with schottky diodes!

Posted by Eli Duttman (A) on November 26, 2001 at 16:21:44

In Reply to: Rebuilding a bridge rectifier with schottky diodes! posted by BrianM23@msn.com on November 26, 2001 at 12:38:36:

The 4 diodes in a bridge are arranged so 2 cathodes and 2 anodes form corners. Each diode is connected to 2 different diodes. The corner with the 2 anodes is the negative DC terminal and the corner with the 2 cathodes is the positive DC terminal. The 2 remaining corners of 1 anode and 1 cathode are connected to the power transformer secondary winding.

Schottky diodes have the HIGHLY desireable property of zero reverse recovery spike. Unfortunately, Schottky diodes with a high enough voltage rating for tube B+ supplies are a bit of a problem. The ON Semiconductor MBR20200CT, a fairly recent arrival, has a PIV of 200 Volts. You could use it to build your bridge, but your margin of safety should a power line spike occur is small. Quite recently, Schottky diodes made from Silicon Carbide with a PIV of 600 Volts were announced; however, these early production parts are EXPENSIVE. From a practical perspective, building your bridge from 600 PIV FREDs seems to make sense to me. You will SIGNIFICANTLY lower the amount of rectifier switching noise, while avoiding complications and expense.

Eli D.

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