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From: Klaus Kragelund <klauskvik@hotmail.com>
Newsgroups: sci.electronics.design
Subject: Re: dc/dc soft start
Date: Fri, 24 Jan 2025 13:09:16 +0100
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On 23-01-2025 00:25, john larkin wrote:
> On Wed, 22 Jan 2025 22:47:10 +0100, Klaus Kragelund
> <klauskvik@hotmail.com> wrote:
> 
>> On 21-01-2025 01:18, john larkin wrote:
>>> On Mon, 20 Jan 2025 22:09:05 +0100, Klaus Kragelund
>>> <klauskvik@hotmail.com> wrote:
>>>
>>>> On 16-01-2025 01:12, john larkin wrote:
>>>>>
>>>>> Here's my soft start circuit. Thanks for suggestions from Tilmann and
>>>>> Jeroen.
>>>>>
>>>>> The idea is to drive the ends of the transformer with in-phase square
>>>>> waves and then slowly walk them to 180 degrees, to achieve a soft
>>>>> start. An FPGA can do that easily. We might take a second... but that
>>>>> would simulate forever.
>>>>>
>>>>> What works well is to use two spice "modulator" elements and FM the
>>>>> frequency of one of them for 50 ms, until they are 180 degrees out of
>>>>> phase.
>>>>>
>>>>> Spice BV elements with sin(time*freq) type expressions seemed to
>>>>> overload or something.
>>>>>
>>>>> Version 4
>>>>> SHEET 1 2568 1220
>>>>> WIRE -512 -944 -576 -944
>>>>> WIRE -400 -944 -512 -944
>>>>> WIRE 16 -944 -32 -944
>>>>> WIRE 48 -944 16 -944
>>>>> WIRE 256 -944 192 -944
>>>>> WIRE 304 -944 256 -944
>>>>> WIRE -1104 -912 -1136 -912
>>>>> WIRE -1040 -912 -1104 -912
>>>>> WIRE -400 -912 -400 -944
>>>>> WIRE -32 -912 -32 -944
>>>>> WIRE 192 -912 192 -944
>>>>> WIRE -128 -896 -144 -896
>>>>> WIRE -80 -896 -128 -896
>>>>> WIRE -848 -880 -896 -880
>>>>> WIRE -800 -880 -848 -880
>>>>> WIRE -128 -848 -144 -848
>>>>> WIRE -80 -848 -128 -848
>>>>> WIRE -576 -816 -576 -944
>>>>> WIRE -784 -800 -848 -800
>>>>> WIRE -720 -800 -784 -800
>>>>> WIRE -624 -800 -720 -800
>>>>> WIRE -400 -800 -400 -832
>>>>> WIRE -32 -800 -32 -832
>>>>> WIRE 192 -800 192 -832
>>>>> WIRE -848 -768 -848 -800
>>>>> WIRE -624 -752 -656 -752
>>>>> WIRE -576 -688 -576 -736
>>>>> WIRE -448 -688 -576 -688
>>>>> WIRE -368 -688 -448 -688
>>>>> WIRE -208 -688 -304 -688
>>>>> WIRE 160 -688 -32 -688
>>>>> WIRE 208 -688 160 -688
>>>>> WIRE 416 -688 272 -688
>>>>> WIRE 480 -688 416 -688
>>>>> WIRE 544 -688 480 -688
>>>>> WIRE 656 -688 544 -688
>>>>> WIRE -848 -656 -848 -688
>>>>> WIRE -576 -640 -576 -688
>>>>> WIRE -656 -624 -656 -752
>>>>> WIRE -624 -624 -656 -624
>>>>> WIRE -720 -576 -720 -800
>>>>> WIRE -624 -576 -720 -576
>>>>> WIRE 208 -576 112 -576
>>>>> WIRE 416 -576 416 -688
>>>>> WIRE 416 -576 272 -576
>>>>> WIRE -1024 -560 -1104 -560
>>>>> WIRE -880 -560 -944 -560
>>>>> WIRE -848 -560 -880 -560
>>>>> WIRE -1104 -544 -1104 -560
>>>>> WIRE -848 -544 -848 -560
>>>>> WIRE -656 -528 -656 -624
>>>>> WIRE -576 -528 -576 -560
>>>>> WIRE -208 -528 -208 -688
>>>>> WIRE -32 -528 -32 -688
>>>>> WIRE 416 -512 416 -576
>>>>> WIRE 544 -512 544 -688
>>>>> WIRE 656 -512 656 -688
>>>>> WIRE -1104 -448 -1104 -464
>>>>> WIRE -848 -448 -848 -480
>>>>> WIRE -528 -400 -576 -400
>>>>> WIRE -480 -400 -528 -400
>>>>> WIRE -576 -368 -576 -400
>>>>> WIRE 160 -368 160 -688
>>>>> WIRE 208 -368 160 -368
>>>>> WIRE 416 -368 416 -448
>>>>> WIRE 416 -368 272 -368
>>>>> WIRE -784 -352 -848 -352
>>>>> WIRE -720 -352 -784 -352
>>>>> WIRE -624 -352 -720 -352
>>>>> WIRE -848 -320 -848 -352
>>>>> WIRE -624 -304 -656 -304
>>>>> WIRE -576 -240 -576 -288
>>>>> WIRE -448 -240 -576 -240
>>>>> WIRE -368 -240 -448 -240
>>>>> WIRE -208 -240 -208 -448
>>>>> WIRE -208 -240 -304 -240
>>>>> WIRE -32 -240 -32 -448
>>>>> WIRE 112 -240 112 -576
>>>>> WIRE 112 -240 -32 -240
>>>>> WIRE 208 -240 112 -240
>>>>> WIRE 416 -240 416 -368
>>>>> WIRE 416 -240 272 -240
>>>>> WIRE 544 -240 544 -432
>>>>> WIRE 544 -240 416 -240
>>>>> WIRE 656 -240 656 -432
>>>>> WIRE 656 -240 544 -240
>>>>> WIRE -848 -208 -848 -240
>>>>> WIRE -576 -192 -576 -240
>>>>> WIRE 416 -192 416 -240
>>>>> WIRE -656 -176 -656 -304
>>>>> WIRE -624 -176 -656 -176
>>>>> WIRE -1072 -160 -1152 -160
>>>>> WIRE -880 -128 -928 -128
>>>>> WIRE -848 -128 -880 -128
>>>>> WIRE -720 -128 -720 -352
>>>>> WIRE -624 -128 -720 -128
>>>>> WIRE -1152 -112 -1152 -160
>>>>> WIRE -656 -80 -656 -176
>>>>> WIRE -576 -80 -576 -112
>>>>> FLAG -400 -800 0
>>>>> FLAG -512 -944 +48
>>>>> FLAG -32 -800 0
>>>>> FLAG -128 -896 HA
>>>>> FLAG -128 -848 HB
>>>>> FLAG 16 -944 BRO
>>>>> FLAG -448 -688 HA
>>>>> FLAG -448 -240 HB
>>>>> FLAG -576 -528 0
>>>>> FLAG -656 -528 0
>>>>> FLAG -576 -80 0
>>>>> FLAG -528 -400 +48
>>>>> FLAG -656 -80 0
>>>>> FLAG 416 -192 0
>>>>> FLAG 480 -688 OUT
>>>>> FLAG -784 -800 A
>>>>> FLAG 256 -944 SS
>>>>> FLAG 192 -800 0
>>>>> FLAG -1104 -912 SS
>>>>> FLAG -1152 -112 0
>>>>> FLAG -784 -352 B
>>>>> FLAG -1104 -448 0
>>>>> FLAG -880 -560 AB
>>>>> FLAG -848 -448 0
>>>>> FLAG -848 -208 0
>>>>> FLAG -880 -128 K
>>>>> FLAG -848 -656 0
>>>>> FLAG -848 -880 J
>>>>> SYMBOL voltage -400 -928 R0
>>>>> WINDOW 0 53 46 Left 2
>>>>> WINDOW 3 53 78 Left 2
>>>>> SYMATTR InstName V3
>>>>> SYMATTR Value 48
>>>>> SYMBOL e -32 -928 R0
>>>>> WINDOW 0 45 50 Left 2
>>>>> WINDOW 3 49 78 Left 2
>>>>> SYMATTR InstName E5
>>>>> SYMATTR Value 1
>>>>> SYMBOL sw -576 -720 M180
>>>>> WINDOW 0 58 74 Left 2
>>>>> WINDOW 3 61 47 Left 2
>>>>> SYMATTR InstName S2
>>>>> SYMATTR Value Sj
>>>>> SYMBOL sw -576 -544 M180
>>>>> WINDOW 0 58 74 Left 2
>>>>> WINDOW 3 61 47 Left 2
>>>>> SYMATTR InstName S3
>>>>> SYMATTR Value Sj
>>>>> SYMBOL sw -576 -272 M180
>>>>> WINDOW 0 58 74 Left 2
>>>>> WINDOW 3 61 47 Left 2
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