Re: Hash through chassis ground

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Posted by Triode Kingdom on April 3, 2003 at 21:59:32

In Reply to: Re: Hash through chassis ground posted by Gary P on April 3, 2003 at 18:31:29:

> The real issue happens at the point where the SS diode is conducting the full load current then is asked to switch off. Their is a finite time it takes to sweep the minority cariers out the PN junction. What this means is when the diode is reverse biased at switch off, current starts flowing backwards through the SS diode.

Thanks for the explanation. I've always seen the spikes, but assumed they were just noise generated by the rapid on-off switching.

I still don't understand why the hybrid circuit won't create the same effect. The SS diodes in the schematic are performing the same task you've described. With or without the tube, the SS diodes deliver current, and are then suddenly asked to turn off. Why wouldn't the reverse current during that time be supplied by the power transformer? Are you certain the circuit eliminates the current spikes in the lead connected to ground?

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Follow Ups Full Thread

Topic - hybrid silicon-tube bridge rectifier - marnold 19:44:06 04/02/03 (18)

any particular diode type? - marnold 13:11:20 04/03/03 (1)

Re: any particular diode type? - arnoldc 08:20:56 04/04/03 (0)

Re: hybrid silicon-tube bridge rectifier - Triode Kingdom 23:09:09 04/02/03 (2)

I take it that ... - Brian C. 04:32:49 04/03/03 (1)

Yes, choke is in the gnd leg (nt) - Triode Kingdom 16:12:40 04/03/03 (0)

Re: hybrid silicon-tube bridge rectifier - Kurt 21:38:59 04/02/03 (9)

Hash through chassis ground - Triode Kingdom 22:48:31 04/02/03 (8)

Re: Hash through chassis ground - Gary P 06:51:42 04/03/03 (7)

Re: Hash through chassis ground - Triode Kingdom 16:09:54 04/03/03 (6)

Re: Hash through chassis ground - Gary P 18:31:29 04/03/03 (5)

Answer to both questions - Gary P 16:47:56 04/04/03 (2)

It's not the same circuit - Triode Kingdom 19:20:47 04/04/03 (1)

Yep, it's the same... - Gary P 19:32:41 04/04/03 (0)

Re: Hash through chassis ground - Gary B. 04:36:57 04/04/03 (0)

Re: Hash through chassis ground - Triode Kingdom 21:59:32 04/03/03 (0)

Re: hybrid silicon-tube bridge rectifier - 45drive45 21:21:45 04/02/03 (0)

Re: hybrid silicon-tube bridge rectifier - Tiny Daddy 21:00:52 04/02/03 (0)

Re: hybrid silicon-tube bridge rectifier - groverg 20:26:08 04/02/03 (0)

Follow Ups

Re: Hash through chassis ground - Triode Kingdom 21:59:32 04/03/03 (0)

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