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1. [Amps] Zero Crossing circuit (score: 1): Author: Ed Stallman <n5blz1@houston.rr.com>; Date: Wed, 17 Nov 2004 20:41:29 +0000; Wondering if anyone has used a zero crossing circuit on a high voltage supply to reduce inrush current at startup? would this work for soft start or would it just assist? Ed N5BLZ -- Outgoing mail is; /archives//html/Amps/2004-11/msg00248.html (6,450 bytes)
2. Re: [Amps] Zero Crossing circuit (score: 1): Author: "Ken Warren" <Ken_Warren@beavton.k12.or.us>; Date: Wed, 17 Nov 2004 14:12:39 -0800; I tried a zero crossing controller in a 750 volt power supply prior to running it on the 3KV plate supply and my experience was that the laminations in the transformer made so much noise that it was; /archives//html/Amps/2004-11/msg00250.html (8,176 bytes)
3. Re: [Amps] Zero Crossing circuit (score: 1): Author: "Phil Clements" <philk5pc@tyler.net>; Date: Wed, 17 Nov 2004 16:19:47 -0600; Subject: [Amps] Zero Crossing circuit Wondering if anyone has used a zero crossing circuit on a high voltage supply to reduce inrush current at startup? would this work for soft start or would it jus; /archives//html/Amps/2004-11/msg00252.html (8,020 bytes)
4. Re: [Amps] Zero Crossing circuit (score: 1): Author: R.Measures <r@somis.org>; Date: Wed, 17 Nov 2004 15:05:02 -0800; Ed-- 1/120 of a secomd is about 2% of the time needed to ramp up a typical HV-PS, so a conventional DC relay stepstart-R is probably a better solution. cheerz On Nov 17, 2004, at 12:41 PM, Ed Stallma; /archives//html/Amps/2004-11/msg00254.html (8,166 bytes)
5. Re: [Amps] Zero Crossing circuit (score: 1): Author: Vic Rosenthal <vic@rakefet.com>; Date: Wed, 17 Nov 2004 15:24:24 -0800; Ken Warren wrote: I tried a zero crossing controller in a 750 volt power supply prior to running it on the 3KV plate supply and my experience was that the laminations in the transformer made so much; /archives//html/Amps/2004-11/msg00255.html (8,454 bytes)
6. Re: [Amps] Zero Crossing circuit (score: 1): Author: jeff millar <wa1hco@adelphia.net>; Date: Wed, 17 Nov 2004 20:03:55 -0500; Ed... I've used zero voltage switched solid state relays twice in 2KW amplifiers, one at 432 and one at 144 MHz. The 432 amp included the normal step start circuit, but once I noticed that the zero v; /archives//html/Amps/2004-11/msg00256.html (10,141 bytes)
7. Re: [Amps] Zero Crossing circuit (score: 1): Author: wb8jkr@juno.com; Date: Wed, 17 Nov 2004 20:31:50 -0500; I think the acquired advantage with the zero crossing is then there isn't a chance the power supply will be turned on at the AC cycle peak. Mark WB8JKR On Wed, 17 Nov 2004 20:03:55 -0500 jeff millar; /archives//html/Amps/2004-11/msg00257.html (10,958 bytes)
8. Re: [Amps] Zero Crossing circuit (score: 1): Author: R.Measures <r@somis.org>; Date: Thu, 18 Nov 2004 01:57:24 -0800; On Nov 17, 2004, at 5:03 PM, jeff millar wrote: Ed... I've used zero voltage switched solid state relays twice in 2KW amplifiers, one at 432 and one at 144 MHz. The 432 amp included the normal step s; /archives//html/Amps/2004-11/msg00263.html (9,045 bytes)
9. Re: [Amps] Zero Crossing circuit (score: 1): Author: R.Measures <r@somis.org>; Date: Thu, 18 Nov 2004 02:58:03 -0800; Mark -- With a simple, current-limiting R / step-start DC relay circuit, it does not matter at which part of the cycle the mains are switched on. The advantage of such a circuit is that it rather-lei; /archives//html/Amps/2004-11/msg00264.html (13,624 bytes)
10. [Amps] Zero Crossing circuit (score: 1): Author: Ed Stallman <n5blz1@houston.rr.com>; Date: Thu, 18 Nov 2004 12:24:15 +0000; Thanks all for the good info, very informative 73 Ed N5BLZ -- Outgoing mail is certified Virus Free. Checked by AVG anti-virus system (http://www.grisoft.com). Version: 6.0.795 / Virus Database: 539; /archives//html/Amps/2004-11/msg00265.html (8,086 bytes)
11. Re: [Amps] Zero Crossing circuit (score: 1): Author: Will Matney <craxd1@ezwv.com>; Date: Thu, 18 Nov 2004 07:50:46 -0500; As Rich mentions, the reverse current on 1/2 of the filter c, electrolytic capacitors act similar to rectifiers in their operation (polarization). Reverse current high enough could cause the capacito; /archives//html/Amps/2004-11/msg00266.html (15,197 bytes)
12. Re: [Amps] Zero Crossing circuit (score: 1): Author: Will Matney <craxd1@ezwv.com>; Date: Thu, 18 Nov 2004 10:09:56 -0500; Dick, I see it like this following example. Suppose there were two of the same model cars setting at a stop light. Both being the same year, and same amount of miles. Suppose a lil ol lady was drivin; /archives//html/Amps/2004-11/msg00267.html (11,953 bytes)
13. Re: [Amps] Zero Crossing circuit (score: 1): Author: Bill Turner <dezrat1242@ispwest.com>; Date: Thu, 18 Nov 2004 07:47:45 -0800; _________________________________________________________ I must disagree. My Command HF-2500 uses zero-crossing solid state devices to turn on and they work perfectly. There is no thump, no noise, a; /archives//html/Amps/2004-11/msg00268.html (8,984 bytes)
14. Re: [Amps] Zero Crossing circuit (score: 1): Author: Will Matney <craxd1@ezwv.com>; Date: Thu, 18 Nov 2004 11:00:51 -0500; Bill, To me, as long as it keeps the inrush current down to an acceptable level, it's okay with me. If you don't hear that big thump, something is doing its job I would think. I've never had any expe; /archives//html/Amps/2004-11/msg00269.html (10,897 bytes)
15. Re: [Amps] Zero Crossing circuit (score: 1): Author: R.Measures <r@somis.org>; Date: Thu, 18 Nov 2004 08:08:20 -0800; On Nov 18, 2004, at 7:47 AM, Bill Turner wrote: On Wed, 17 Nov 2004 16:19:47 -0600, Phil Clements wrote: Zero crossing circuits (solid-state relays) are far too fast acting for use as a soft-start de; /archives//html/Amps/2004-11/msg00270.html (10,333 bytes)
16. Re: [Amps] Zero Crossing circuit (score: 1): Author: "Bob Bruno - K2KI" <k2ki@starc.org>; Date: Thu, 18 Nov 2004 11:09:22 -0500; For what it's worth, I myself have a variac in line with the xfrmr. I don't mind bringing up things slowly on my own. :-) 73, CUL... Bob de K2KI k2ki@starc.org _______________________________________; /archives//html/Amps/2004-11/msg00271.html (18,141 bytes)
17. Re: [Amps] Zero Crossing circuit (score: 1): Author: Bill Turner <dezrat1242@ispwest.com>; Date: Thu, 18 Nov 2004 09:46:37 -0800; _________________________________________________________ A variac would certainly do the job, but some careful engineering would be more cost-effective, would require no manual operation, and would; /archives//html/Amps/2004-11/msg00272.html (8,571 bytes)
18. Re: [Amps] Zero Crossing circuit (score: 1): Author: Bill Turner <dezrat1242@ispwest.com>; Date: Thu, 18 Nov 2004 09:46:36 -0800; _________________________________________________________ Winding resistance is one factor. There is also the capacitance of the filter caps and the inductance of both primary and secondary of the tr; /archives//html/Amps/2004-11/msg00273.html (9,518 bytes)
19. Re: [Amps] Zero Crossing circuit (score: 1): Author: R.Measures <r@somis.org>; Date: Thu, 18 Nov 2004 10:17:45 -0800; On Nov 18, 2004, at 9:46 AM, Bill Turner wrote: On Thu, 18 Nov 2004 11:09:22 -0500, Bob Bruno - K2KI wrote: For what it's worth, I myself have a variac in line with the xfrmr. I don't mind bringing u; /archives//html/Amps/2004-11/msg00274.html (9,149 bytes)

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