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New Improved +/-45V PSU

Started by Harry D July 18, 2013
Here is my 2W  +/-45V PSU

http://kvisit.com/S_KuKAw

 See the MSD7342-224ml for coupled inductor.
 The IRF9640 is overkill but only SC3 model available.
 The control loop should be pretty straight forward.
 What is the input voltage range desired? 

 I would copy in that neat net + wiring list that you guys use but do not know how. Just learning LTSPICE.

 Cheers,   Harry
Harry D <harryd@tdsystems.org> wrote:

> Here is my 2W +/-45V PSU > > http://kvisit.com/S_KuKAw > > See the MSD7342-224ml for coupled inductor. > The IRF9640 is overkill but only SC3 model available. > The control loop should be pretty straight forward. > What is the input voltage range desired? > > I would copy in that neat net + wiring list that you guys use but do > not know how. Just learning LTSPICE. > > Cheers, Harry >
Harry, thanks for posting. You are doing great. To post your ASC file, you can put it on the web site as you have done. There is also an option on the web site to provide a direct download link. For example, your ASC file is at http://www.keepandshare.com/doc/6460924/fly-hob-hd-asc-2k?da=y You can also load the ASC file into an ascii editor and paste it into your newsgroup client. This creates the problem of line wrap when you have anything that extends past column 70 or so. It also creates havoc with some news clients that wish to change symbols to hex. For example, the equal sign, "=", becomes "=3D". This creates problems in LTspice since it cannot deciper lines like SYMATTR SpiceLine Rser=3D0.02 Rpar=3D5000 Some newsgroups allow you to post an ASC file as an attachment. This is convenient since the newsreader usually saves the attachment to a folder. This eliminates the problem of wrapping long lines in the newsreader. There are a number of ways of conveying your circuit to the newsgroup. Try to pick one that causes the least amount of problems for your readers. There is a bit of overshoot in your circuit on startup. You might consider lowering the on time of the IRF9640. You can set V2 to around 50% duty cycle. Try PULSE(0 10 10N 10N 10N 5U 10U) It needs just a tad more on time to come up exactly on the target voltage. However, this will change with the load. JK
"John K" <spam@me.not> wrote in message 
news:XnsA201F23A136F8idtokenpost@69.16.179.20...
> Harry D <harryd@tdsystems.org> wrote: > >> Here is my 2W +/-45V PSU >> >> http://kvisit.com/S_KuKAw >> >> See the MSD7342-224ml for coupled inductor. >> The IRF9640 is overkill but only SC3 model available. >> The control loop should be pretty straight forward. >> What is the input voltage range desired? >> >> I would copy in that neat net + wiring list that you guys use but do >> not know how. Just learning LTSPICE. >> >> Cheers, Harry >> > > Harry, thanks for posting. You are doing great. > > To post your ASC file, you can put it on the web site as you have done. > > There is also an option on the web site to provide a direct download > link. For example, your ASC file is at >
Ok, so here is my *.asc file: Version 4 SHEET 1 1108 900 WIRE -816 -256 -1200 -256 WIRE -576 -256 -816 -256 WIRE -80 -256 -576 -256 WIRE -1632 -240 -1680 -240 WIRE -1504 -240 -1552 -240 WIRE -1488 -240 -1504 -240 WIRE -576 -192 -576 -256 WIRE -816 -176 -816 -256 WIRE -864 -160 -944 -160 WIRE -1856 -128 -1952 -128 WIRE -1680 -128 -1680 -240 WIRE -1456 -128 -1680 -128 WIRE -80 -128 -80 -256 WIRE -944 -112 -944 -160 WIRE -256 -112 -288 -112 WIRE -128 -112 -176 -112 WIRE -1200 -80 -1200 -256 WIRE -1952 -64 -1952 -128 WIRE -576 -48 -576 -112 WIRE -1456 -16 -1456 -128 WIRE -1360 -16 -1456 -16 WIRE -992 16 -1040 16 WIRE -864 16 -864 -112 WIRE -864 16 -992 16 WIRE -816 16 -816 -96 WIRE -688 16 -816 16 WIRE -288 16 -288 -112 WIRE -288 16 -688 16 WIRE -1680 48 -1680 -128 WIRE -1632 48 -1680 48 WIRE -1520 48 -1568 48 WIRE -1408 48 -1440 48 WIRE -1360 48 -1408 48 WIRE -1680 80 -1680 48 WIRE -768 96 -816 96 WIRE -752 96 -768 96 WIRE -432 96 -464 96 WIRE -320 96 -368 96 WIRE -192 96 -240 96 WIRE -1440 112 -1472 112 WIRE -1376 112 -1440 112 WIRE -1360 112 -1376 112 WIRE -80 112 -80 -32 WIRE -1472 128 -1472 112 WIRE -816 128 -816 96 WIRE -1024 144 -1040 144 WIRE -976 144 -1024 144 WIRE -912 144 -976 144 WIRE -864 144 -864 16 WIRE -1360 176 -1392 176 WIRE -464 208 -464 96 WIRE -464 208 -576 208 WIRE -352 208 -464 208 WIRE -192 208 -192 96 WIRE -192 208 -288 208 WIRE -80 208 -80 112 WIRE 32 208 -80 208 WIRE 192 208 96 208 WIRE 288 208 192 208 WIRE -1472 224 -1472 208 WIRE -1392 224 -1392 176 WIRE -1392 224 -1472 224 WIRE -1472 240 -1472 224 WIRE -576 240 -576 208 WIRE -192 240 -192 208 WIRE -80 240 -80 208 WIRE 288 240 288 208 WIRE -464 256 -464 208 WIRE 192 256 192 208 WIRE -912 272 -912 144 WIRE -1200 288 -1200 240 WIRE -816 288 -816 224 WIRE -736 288 -816 288 WIRE -816 352 -816 288 WIRE -816 352 -864 352 WIRE -576 368 -576 320 WIRE -464 368 -464 320 WIRE -192 368 -192 320 WIRE -80 368 -80 320 WIRE 192 368 192 320 WIRE 288 368 288 320 WIRE -1376 384 -1376 112 WIRE -1312 384 -1376 384 WIRE -1024 384 -1024 144 WIRE -1024 384 -1232 384 WIRE -1024 400 -1024 384 FLAG -576 -48 0 FLAG -80 368 0 FLAG 192 368 0 FLAG -192 368 0 FLAG -464 368 0 FLAG -576 368 0 FLAG 288 368 0 FLAG -80 112 VS FLAG 288 208 NO FLAG -576 208 PO FLAG -1200 288 0 FLAG -992 16 DV FLAG -688 16 DN FLAG -1472 304 0 FLAG -1472 224 FR FLAG -736 368 0 FLAG -1024 464 0 FLAG -912 368 0 FLAG -1440 112 VR FLAG -768 96 VR FLAG -976 144 IS FLAG -944 -112 0 FLAG -1680 160 0 FLAG -1504 -240 PO FLAG -1408 48 CP FLAG -1952 16 0 FLAG -1792 -128 CP SYMBOL ind2 -96 224 R0 WINDOW 0 50 51 Left 2 WINDOW 3 60 86 Left 2 SYMATTR InstName L1 SYMATTR Value 220&#2013266101; SYMATTR Type ind SYMATTR SpiceLine Rser=1.72 SYMBOL cap -480 256 R0 SYMATTR InstName C1 SYMATTR Value 1&#2013266101; SYMBOL schottky 96 224 M270 WINDOW 0 32 32 VTop 2 WINDOW 3 -3 -7 VBottom 2 SYMATTR InstName D1 SYMATTR Value MBRS1100 SYMATTR Description Diode SYMATTR Type diode SYMBOL voltage -576 -208 R0 WINDOW 123 0 0 Left 2 WINDOW 39 0 0 Left 2 SYMATTR InstName V1 SYMATTR Value 16 SYMBOL schottky -288 224 M270 WINDOW 0 32 32 VTop 2 WINDOW 3 0 32 VBottom 2 SYMATTR InstName D3 SYMATTR Value MBRS1100 SYMATTR Description Diode SYMATTR Type diode SYMBOL cap 208 320 R180 WINDOW 0 24 56 Left 2 WINDOW 3 24 8 Left 2 SYMATTR InstName C6 SYMATTR Value 1&#2013266101; SYMBOL res -592 224 R0 WINDOW 3 25 4 Left 2 SYMATTR Value 2.2K SYMATTR InstName R2 SYMBOL res 272 224 R0 SYMATTR InstName R4 SYMATTR Value 2.2K SYMBOL res -160 -128 R90 WINDOW 0 0 56 VBottom 2 WINDOW 3 32 56 VTop 2 SYMATTR InstName R1 SYMATTR Value 20 SYMBOL ind2 -208 336 M180 WINDOW 0 36 80 Left 2 WINDOW 3 36 40 Left 2 SYMATTR InstName L2 SYMATTR Value 220&#2013266101; SYMATTR Type ind SYMATTR SpiceLine Rser=1.72 SYMBOL pmos -128 -32 M180 SYMATTR InstName M2 SYMATTR Value IRF9640 SYMBOL e -816 -192 R0 SYMATTR InstName E1 SYMATTR Value -1 SYMBOL res -1488 112 R0 SYMATTR InstName R3 SYMATTR Value 30K SYMBOL cap -1488 240 R0 SYMATTR InstName C2 SYMATTR Value 470p SYMBOL res -1216 368 R90 WINDOW 0 0 56 VBottom 2 WINDOW 3 32 56 VTop 2 SYMATTR InstName R6 SYMATTR Value 30K SYMBOL cap -1040 400 R0 SYMATTR InstName C3 SYMATTR Value 1n SYMBOL pmos -864 224 M180 SYMATTR InstName M1 SYMATTR Value BSS84 SYMBOL nmos -864 272 M0 SYMATTR InstName M3 SYMATTR Value 2N7002 SYMBOL res -752 272 R0 SYMATTR InstName R5 SYMATTR Value 2K SYMBOL res -1696 64 R0 SYMATTR InstName R7 SYMATTR Value 10K SYMBOL res -1536 -256 R90 WINDOW 0 0 56 VBottom 2 WINDOW 3 32 56 VTop 2 SYMATTR InstName R8 SYMATTR Value 170K SYMBOL cap -1568 32 R90 WINDOW 0 0 32 VBottom 2 WINDOW 3 32 32 VTop 2 SYMATTR InstName C4 SYMATTR Value 100n SYMBOL res -1424 32 R90 WINDOW 0 0 56 VBottom 2 WINDOW 3 32 56 VTop 2 SYMATTR InstName R9 SYMATTR Value 68K SYMBOL PowerProducts\\LT1242 -1200 80 R0 SYMATTR InstName U1 SYMBOL voltage -1952 -80 R0 WINDOW 3 -49 325 Left 2 WINDOW 123 0 0 Left 2 WINDOW 39 0 0 Left 2 SYMATTR Value PULSE(-1.0 5 10N 5M 10M 10M 30M) SYMATTR InstName V2 SYMBOL diode -1792 -144 R90 WINDOW 0 0 32 VBottom 2 WINDOW 3 32 32 VTop 2 SYMATTR InstName D2 SYMBOL res -224 80 R90 WINDOW 0 0 56 VBottom 2 WINDOW 3 37 48 VTop 2 SYMATTR InstName R11 SYMATTR Value 220 SYMBOL cap -368 80 R90 WINDOW 0 0 32 VBottom 2 WINDOW 3 32 32 VTop 2 SYMATTR InstName C5 SYMATTR Value 120p TEXT -912 -352 Left 2 !.tran 0 4MU 0 100N TEXT -216 424 Left 2 !K L1 L2 0.9965 TEXT -216 472 Left 2 ;MSD7342-224 Aah, will that work for everyone? Thanks, harry
On Thu, 18 Jul 2013 12:22:54 -0700 (PDT), Harry D <harryd@tdsystems.org> wrote:

>Here is my 2W +/-45V PSU > >http://kvisit.com/S_KuKAw > > See the MSD7342-224ml for coupled inductor. > The IRF9640 is overkill but only SC3 model available. > The control loop should be pretty straight forward. > What is the input voltage range desired? > > I would copy in that neat net + wiring list that you guys use but do not know how. Just learning LTSPICE. > > Cheers, Harry
This is fun. Only one inductor and a home-made switcher circuit. Peak current limit and sort of constant off-time. Version 4 SHEET 1 1180 680 WIRE 368 -272 320 -272 WIRE 496 -272 432 -272 WIRE 560 -272 496 -272 WIRE 832 -272 624 -272 WIRE 928 -272 832 -272 WIRE 992 -272 928 -272 WIRE 992 -240 992 -272 WIRE 832 -224 832 -272 WIRE 496 -208 496 -272 WIRE 16 -160 -128 -160 WIRE 128 -160 16 -160 WIRE 272 -160 208 -160 WIRE 320 -160 320 -272 WIRE 320 -160 272 -160 WIRE 16 -128 16 -160 WIRE 496 -112 496 -144 WIRE 832 -112 832 -160 WIRE 992 -112 992 -160 WIRE 320 -32 320 -160 WIRE 368 -32 320 -32 WIRE 496 -32 432 -32 WIRE 576 -32 496 -32 WIRE 688 -32 640 -32 WIRE 832 -32 688 -32 WIRE 928 -32 832 -32 WIRE 992 -32 928 -32 WIRE 16 -16 16 -48 WIRE 496 0 496 -32 WIRE 992 0 992 -32 WIRE -128 16 -128 -160 WIRE 832 16 832 -32 WIRE 320 96 320 -32 WIRE 688 96 688 -32 WIRE 496 112 496 64 WIRE 832 128 832 80 WIRE 992 128 992 80 WIRE -128 176 -128 96 WIRE -48 176 -128 176 WIRE 16 176 -48 176 WIRE 80 176 16 176 WIRE 160 176 144 176 WIRE 272 176 240 176 WIRE -128 256 -128 176 WIRE 416 256 112 256 WIRE 688 256 688 160 WIRE 688 256 496 256 WIRE 16 288 16 176 WIRE 112 336 112 256 WIRE 112 336 80 336 WIRE 160 336 112 336 WIRE 320 336 320 192 WIRE 320 336 240 336 WIRE 416 336 320 336 WIRE 576 336 496 336 WIRE 576 416 576 336 WIRE -128 432 -128 320 WIRE 16 432 16 384 FLAG 576 416 0 FLAG 16 432 0 FLAG -128 432 0 FLAG 832 128 0 FLAG 16 -16 0 FLAG 496 112 0 FLAG 832 -112 0 FLAG 496 -112 0 FLAG 992 -112 0 FLAG 992 128 0 FLAG 928 -32 VP FLAG 928 -272 VN FLAG -48 176 RC FLAG 272 -160 D SYMBOL nmos 272 96 R0 WINDOW 0 101 34 Left 2 WINDOW 3 76 70 Left 2 SYMATTR InstName M1 SYMATTR Value FDS3570 SYMBOL res 512 320 R90 WINDOW 0 64 59 VBottom 2 WINDOW 3 73 56 VTop 2 SYMATTR InstName R1 SYMATTR Value 0.7 SYMBOL schottky 576 -16 R270 WINDOW 0 -40 31 VTop 2 WINDOW 3 -41 34 VBottom 2 SYMATTR InstName D1 SYMATTR Value BAT46WJ SYMATTR Description Diode SYMATTR Type diode SYMBOL ind2 112 -144 R270 WINDOW 0 94 58 VTop 2 WINDOW 3 81 58 VBottom 2 SYMATTR InstName L1 SYMATTR Value 15&#2013266101; SYMATTR Type ind SYMBOL cap 816 16 R0 WINDOW 0 59 31 Left 2 WINDOW 3 55 65 Left 2 SYMATTR InstName C1 SYMATTR Value 10&#2013266101; SYMBOL npn 80 288 M0 WINDOW 0 101 36 Left 2 WINDOW 3 73 76 Left 2 SYMATTR InstName Q1 SYMATTR Value 2N4401 SYMBOL res 256 320 R90 WINDOW 0 72 58 VBottom 2 WINDOW 3 83 60 VTop 2 SYMATTR InstName R2 SYMATTR Value 500 SYMBOL cap -144 256 R0 WINDOW 0 47 -21 Left 2 WINDOW 3 35 9 Left 2 SYMATTR InstName C2 SYMATTR Value 330p SYMBOL voltage 16 -144 R0 WINDOW 0 51 45 Left 2 WINDOW 3 54 81 Left 2 SYMATTR InstName V1 SYMATTR Value 16 SYMBOL res -144 0 R0 WINDOW 0 54 36 Left 2 WINDOW 3 48 72 Left 2 SYMATTR InstName R3 SYMATTR Value 10K SYMBOL Digital\\schmtbuf 80 112 R0 SYMATTR InstName A2 SYMATTR Value2 Vhigh=5 Vt=2.5 Vh=0.5 SYMATTR SpiceLine Td=5n SYMBOL zener 704 160 R180 WINDOW 0 79 15 Left 2 WINDOW 3 54 -22 Left 2 SYMATTR InstName D2 SYMATTR Value DFLZ33 SYMATTR Description Diode SYMATTR Type diode SYMBOL res 512 240 R90 WINDOW 0 0 56 VBottom 2 WINDOW 3 32 56 VTop 2 SYMATTR InstName R4 SYMATTR Value 1K SYMBOL schottky 512 64 R180 WINDOW 0 66 33 Left 2 WINDOW 3 41 -7 Left 2 SYMATTR InstName D4 SYMATTR Value BAT46WJ SYMATTR Description Diode SYMATTR Type diode SYMBOL cap 432 -48 R90 WINDOW 0 -52 29 VBottom 2 WINDOW 3 -42 27 VTop 2 SYMATTR InstName C4 SYMATTR Value 1&#2013266101; SYMBOL schottky 624 -288 R90 WINDOW 0 65 -24 VBottom 2 WINDOW 3 67 -26 VTop 2 SYMATTR InstName D6 SYMATTR Value BAT46WJ SYMATTR Description Diode SYMATTR Type diode SYMBOL cap 816 -224 R0 WINDOW 0 62 24 Left 2 WINDOW 3 58 57 Left 2 SYMATTR InstName C6 SYMATTR Value 10&#2013266101; SYMBOL cap 432 -288 R90 WINDOW 0 72 32 VBottom 2 WINDOW 3 81 32 VTop 2 SYMATTR InstName C7 SYMATTR Value 1&#2013266101; SYMBOL schottky 480 -208 R0 WINDOW 0 84 51 Left 2 WINDOW 3 59 85 Left 2 SYMATTR InstName D7 SYMATTR Value BAT46WJ SYMATTR Description Diode SYMATTR Type diode SYMBOL res 976 -256 R0 WINDOW 0 62 50 Left 2 WINDOW 3 62 81 Left 2 SYMATTR InstName R5 SYMATTR Value 2K SYMBOL res 976 -16 R0 WINDOW 0 61 41 Left 2 WINDOW 3 61 75 Left 2 SYMATTR InstName R6 SYMATTR Value 2K SYMBOL res 256 160 R90 WINDOW 0 -44 55 VBottom 2 WINDOW 3 -38 56 VTop 2 SYMATTR InstName R7 SYMATTR Value 100 TEXT 788 320 Left 2 !.tran 5m uic TEXT 696 384 Left 2 ;Bipolar Boost JL July 2013 -- John Larkin Highland Technology Inc www.highlandtechnology.com jlarkin at highlandtechnology dot com Precision electronic instrumentation Picosecond-resolution Digital Delay and Pulse generators Custom timing and laser controllers Photonics and fiberoptic TTL data links VME analog, thermocouple, LVDT, synchro, tachometer Multichannel arbitrary waveform generators
On Monday, July 22, 2013 5:49:18 AM UTC+2, John Larkin wrote:
> On Thu, 18 Jul 2013 12:22:54 -0700 (PDT), Harry D <harryd@tdsystems.org> wrote: > > > > >Here is my 2W +/-45V PSU > > > > > >http://kvisit.com/S_KuKAw > > > > > > See the MSD7342-224ml for coupled inductor. > > > The IRF9640 is overkill but only SC3 model available. > > > The control loop should be pretty straight forward. > > > What is the input voltage range desired? > > > > > > I would copy in that neat net + wiring list that you guys use but do not know how. Just learning LTSPICE. > > > > > > Cheers, Harry > > > > > > This is fun. Only one inductor and a home-made switcher circuit. Peak current > > limit and sort of constant off-time. > > > > Version 4 > > SHEET 1 1180 680 > > WIRE 368 -272 320 -272 >
[snip] Very nice indeed. I just plugged it into PSpice, reduced the output caps to 100nF and induced a step response. It seems quite stable, allthough I have not dug very deep Increasing the value of the inductor L1 to 150uH does introduce ringing with C4 and C7 which makes is unstable during startup and transients due to the ringing sense current in R1. Regards Klaus
On Monday, July 22, 2013 3:07:26 PM UTC+2, Klaus Kragelund wrote:
> On Monday, July 22, 2013 5:49:18 AM UTC+2, John Larkin wrote: > > > On Thu, 18 Jul 2013 12:22:54 -0700 (PDT), Harry D <harryd@tdsystems.org> wrote: > > > > > > > > > > > > >Here is my 2W +/-45V PSU > > > > > > > > > > > > > >http://kvisit.com/S_KuKAw > > > > > > > > > > > > > > See the MSD7342-224ml for coupled inductor. > > > > > > > The IRF9640 is overkill but only SC3 model available. > > > > > > > The control loop should be pretty straight forward. > > > > > > > What is the input voltage range desired? > > > > > > > > > > > > > > I would copy in that neat net + wiring list that you guys use but do not know how. Just learning LTSPICE. > > > > > > > > > > > > > > Cheers, Harry > > > > > > > > > > > > > > > > > > This is fun. Only one inductor and a home-made switcher circuit. Peak current > > > > > > limit and sort of constant off-time. > > > > > > > > > > > > Version 4 > > > > > > SHEET 1 1180 680 > > > > > > WIRE 368 -272 320 -272 > > > > > [snip] > > > > Very nice indeed. I just plugged it into PSpice, reduced the output caps to 100nF and induced a step response. It seems quite stable, allthough I have not dug very deep > > > > Increasing the value of the inductor L1 to 150uH does introduce ringing with C4 and C7 which makes is unstable during startup and transients due to the ringing sense current in R1. >
That is, increasing the inductor to 150uH keeping all other components the same values as from the ASC posted by Larkin makes it unstable... Cheers Klaus
On Sun, 21 Jul 2013 20:49:18 -0700, John Larkin
<jjlarkin@highNOTlandTHIStechnologyPART.com> wrote:

>On Thu, 18 Jul 2013 12:22:54 -0700 (PDT), Harry D <harryd@tdsystems.org> wrote: > >>Here is my 2W +/-45V PSU >> >>http://kvisit.com/S_KuKAw >> >> See the MSD7342-224ml for coupled inductor. >> The IRF9640 is overkill but only SC3 model available. >> The control loop should be pretty straight forward. >> What is the input voltage range desired? >> >> I would copy in that neat net + wiring list that you guys use but do not know how. Just learning LTSPICE. >> >> Cheers, Harry > > >This is fun. Only one inductor and a home-made switcher circuit. Peak current >limit and sort of constant off-time. > >Version 4 >SHEET 1 1180 680 >WIRE 368 -272 320 -272 >WIRE 496 -272 432 -272 >WIRE 560 -272 496 -272 >WIRE 832 -272 624 -272 >WIRE 928 -272 832 -272 >WIRE 992 -272 928 -272 >WIRE 992 -240 992 -272 >WIRE 832 -224 832 -272 >WIRE 496 -208 496 -272 >WIRE 16 -160 -128 -160 >WIRE 128 -160 16 -160 >WIRE 272 -160 208 -160 >WIRE 320 -160 320 -272 >WIRE 320 -160 272 -160 >WIRE 16 -128 16 -160 >WIRE 496 -112 496 -144 >WIRE 832 -112 832 -160 >WIRE 992 -112 992 -160 >WIRE 320 -32 320 -160 >WIRE 368 -32 320 -32 >WIRE 496 -32 432 -32 >WIRE 576 -32 496 -32 >WIRE 688 -32 640 -32 >WIRE 832 -32 688 -32 >WIRE 928 -32 832 -32 >WIRE 992 -32 928 -32 >WIRE 16 -16 16 -48 >WIRE 496 0 496 -32 >WIRE 992 0 992 -32 >WIRE -128 16 -128 -160 >WIRE 832 16 832 -32 >WIRE 320 96 320 -32 >WIRE 688 96 688 -32 >WIRE 496 112 496 64 >WIRE 832 128 832 80 >WIRE 992 128 992 80 >WIRE -128 176 -128 96 >WIRE -48 176 -128 176 >WIRE 16 176 -48 176 >WIRE 80 176 16 176 >WIRE 160 176 144 176 >WIRE 272 176 240 176 >WIRE -128 256 -128 176 >WIRE 416 256 112 256 >WIRE 688 256 688 160 >WIRE 688 256 496 256 >WIRE 16 288 16 176 >WIRE 112 336 112 256 >WIRE 112 336 80 336 >WIRE 160 336 112 336 >WIRE 320 336 320 192 >WIRE 320 336 240 336 >WIRE 416 336 320 336 >WIRE 576 336 496 336 >WIRE 576 416 576 336 >WIRE -128 432 -128 320 >WIRE 16 432 16 384 >FLAG 576 416 0 >FLAG 16 432 0 >FLAG -128 432 0 >FLAG 832 128 0 >FLAG 16 -16 0 >FLAG 496 112 0 >FLAG 832 -112 0 >FLAG 496 -112 0 >FLAG 992 -112 0 >FLAG 992 128 0 >FLAG 928 -32 VP >FLAG 928 -272 VN >FLAG -48 176 RC >FLAG 272 -160 D >SYMBOL nmos 272 96 R0 >WINDOW 0 101 34 Left 2 >WINDOW 3 76 70 Left 2 >SYMATTR InstName M1 >SYMATTR Value FDS3570 >SYMBOL res 512 320 R90 >WINDOW 0 64 59 VBottom 2 >WINDOW 3 73 56 VTop 2 >SYMATTR InstName R1 >SYMATTR Value 0.7 >SYMBOL schottky 576 -16 R270 >WINDOW 0 -40 31 VTop 2 >WINDOW 3 -41 34 VBottom 2 >SYMATTR InstName D1 >SYMATTR Value BAT46WJ >SYMATTR Description Diode >SYMATTR Type diode >SYMBOL ind2 112 -144 R270 >WINDOW 0 94 58 VTop 2 >WINDOW 3 81 58 VBottom 2 >SYMATTR InstName L1 >SYMATTR Value 15&#2013266101; >SYMATTR Type ind >SYMBOL cap 816 16 R0 >WINDOW 0 59 31 Left 2 >WINDOW 3 55 65 Left 2 >SYMATTR InstName C1 >SYMATTR Value 10&#2013266101; >SYMBOL npn 80 288 M0 >WINDOW 0 101 36 Left 2 >WINDOW 3 73 76 Left 2 >SYMATTR InstName Q1 >SYMATTR Value 2N4401 >SYMBOL res 256 320 R90 >WINDOW 0 72 58 VBottom 2 >WINDOW 3 83 60 VTop 2 >SYMATTR InstName R2 >SYMATTR Value 500 >SYMBOL cap -144 256 R0 >WINDOW 0 47 -21 Left 2 >WINDOW 3 35 9 Left 2 >SYMATTR InstName C2 >SYMATTR Value 330p >SYMBOL voltage 16 -144 R0 >WINDOW 0 51 45 Left 2 >WINDOW 3 54 81 Left 2 >SYMATTR InstName V1 >SYMATTR Value 16 >SYMBOL res -144 0 R0 >WINDOW 0 54 36 Left 2 >WINDOW 3 48 72 Left 2 >SYMATTR InstName R3 >SYMATTR Value 10K >SYMBOL Digital\\schmtbuf 80 112 R0 >SYMATTR InstName A2 >SYMATTR Value2 Vhigh=5 Vt=2.5 Vh=0.5 >SYMATTR SpiceLine Td=5n >SYMBOL zener 704 160 R180 >WINDOW 0 79 15 Left 2 >WINDOW 3 54 -22 Left 2 >SYMATTR InstName D2 >SYMATTR Value DFLZ33 >SYMATTR Description Diode >SYMATTR Type diode >SYMBOL res 512 240 R90 >WINDOW 0 0 56 VBottom 2 >WINDOW 3 32 56 VTop 2 >SYMATTR InstName R4 >SYMATTR Value 1K >SYMBOL schottky 512 64 R180 >WINDOW 0 66 33 Left 2 >WINDOW 3 41 -7 Left 2 >SYMATTR InstName D4 >SYMATTR Value BAT46WJ >SYMATTR Description Diode >SYMATTR Type diode >SYMBOL cap 432 -48 R90 >WINDOW 0 -52 29 VBottom 2 >WINDOW 3 -42 27 VTop 2 >SYMATTR InstName C4 >SYMATTR Value 1&#2013266101; >SYMBOL schottky 624 -288 R90 >WINDOW 0 65 -24 VBottom 2 >WINDOW 3 67 -26 VTop 2 >SYMATTR InstName D6 >SYMATTR Value BAT46WJ >SYMATTR Description Diode >SYMATTR Type diode >SYMBOL cap 816 -224 R0 >WINDOW 0 62 24 Left 2 >WINDOW 3 58 57 Left 2 >SYMATTR InstName C6 >SYMATTR Value 10&#2013266101; >SYMBOL cap 432 -288 R90 >WINDOW 0 72 32 VBottom 2 >WINDOW 3 81 32 VTop 2 >SYMATTR InstName C7 >SYMATTR Value 1&#2013266101; >SYMBOL schottky 480 -208 R0 >WINDOW 0 84 51 Left 2 >WINDOW 3 59 85 Left 2 >SYMATTR InstName D7 >SYMATTR Value BAT46WJ >SYMATTR Description Diode >SYMATTR Type diode >SYMBOL res 976 -256 R0 >WINDOW 0 62 50 Left 2 >WINDOW 3 62 81 Left 2 >SYMATTR InstName R5 >SYMATTR Value 2K >SYMBOL res 976 -16 R0 >WINDOW 0 61 41 Left 2 >WINDOW 3 61 75 Left 2 >SYMATTR InstName R6 >SYMATTR Value 2K >SYMBOL res 256 160 R90 >WINDOW 0 -44 55 VBottom 2 >WINDOW 3 -38 56 VTop 2 >SYMATTR InstName R7 >SYMATTR Value 100 >TEXT 788 320 Left 2 !.tran 5m uic >TEXT 696 384 Left 2 ;Bipolar Boost JL July 2013
Isn't that the circuit Hobbs posted last week? ...Jim Thompson -- | James E.Thompson | mens | | Analog Innovations | et | | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | | San Tan Valley, AZ 85142 Skype: Contacts Only | | | Voice:(480)460-2350 Fax: Available upon request | Brass Rat | | E-mail Icon at http://www.analog-innovations.com | 1962 | I love to cook with wine. Sometimes I even put it in the food.
On 07/22/2013 10:01 AM, Jim Thompson wrote:
> On Sun, 21 Jul 2013 20:49:18 -0700, John Larkin > <jjlarkin@highNOTlandTHIStechnologyPART.com> wrote: > >> On Thu, 18 Jul 2013 12:22:54 -0700 (PDT), Harry D <harryd@tdsystems.org> wrote: >> >>> Here is my 2W +/-45V PSU >>> >>> http://kvisit.com/S_KuKAw >>> >>> See the MSD7342-224ml for coupled inductor. >>> The IRF9640 is overkill but only SC3 model available. >>> The control loop should be pretty straight forward. >>> What is the input voltage range desired? >>> >>> I would copy in that neat net + wiring list that you guys use but do not know how. Just learning LTSPICE. >>> >>> Cheers, Harry >> >> >> This is fun. Only one inductor and a home-made switcher circuit. Peak current >> limit and sort of constant off-time. >> >> Version 4 >> SHEET 1 1180 680
<snip>
>> TEXT 696 384 Left 2 ;Bipolar Boost JL July 2013 > > Isn't that the circuit Hobbs posted last week? > > ...Jim Thompson >
No, mine was a buck-boost, whereas John has posted a few capacitively coupled boosts, of which this is one. The nice thing about doing it his way is that you get some cross-regulation, because one polarity adjusts the voltage swing on the inductor, whereas I get the full input voltage variation impressed on the HV and have to get rid of it afterwards. The efficiency is comparatively poor for some reason that I haven't looked into very deeply--if you filter the current draw from V1 using a 100 milliohm/1 millifarad RC lowpass to get rid of the spikes, and compute (V(VP)*I(R5)+V(VN)*I(R6))/(-16*I(V1)), it never gets above about 0.3. The nice thing about doing it my way is that you only need one switching regulator instead of two (one inverter and one AC-coupled boost), and that it's simpler and more efficient. The OP's circuit also has the nice cross-regulation feature, but needs a lot of parts, including a $2.50 regulator chip, and a transformer that would need to be a toroid to make me happy, at least at this stage of my education in how to combine SMPSes with ultrasensitive instruments. Defeating the current-sense like that seems a bit counterproductive as well. Cheers Phil Hobbs -- Dr Philip C D Hobbs Principal Consultant ElectroOptical Innovations LLC Optics, Electro-optics, Photonics, Analog Electronics 160 North State Road #203 Briarcliff Manor NY 10510 hobbs at electrooptical dot net http://electrooptical.net
On Mon, 22 Jul 2013 11:06:15 -0400, Phil Hobbs
<pcdhSpamMeSenseless@electrooptical.net> wrote:

>On 07/22/2013 10:01 AM, Jim Thompson wrote: >> On Sun, 21 Jul 2013 20:49:18 -0700, John Larkin >> <jjlarkin@highNOTlandTHIStechnologyPART.com> wrote: >> >>> On Thu, 18 Jul 2013 12:22:54 -0700 (PDT), Harry D <harryd@tdsystems.org> wrote: >>> >>>> Here is my 2W +/-45V PSU >>>> >>>> http://kvisit.com/S_KuKAw >>>> >>>> See the MSD7342-224ml for coupled inductor. >>>> The IRF9640 is overkill but only SC3 model available. >>>> The control loop should be pretty straight forward. >>>> What is the input voltage range desired? >>>> >>>> I would copy in that neat net + wiring list that you guys use but do not know how. Just learning LTSPICE. >>>> >>>> Cheers, Harry >>> >>> >>> This is fun. Only one inductor and a home-made switcher circuit. Peak current >>> limit and sort of constant off-time. >>> >>> Version 4 >>> SHEET 1 1180 680 ><snip> >>> TEXT 696 384 Left 2 ;Bipolar Boost JL July 2013 >> >> Isn't that the circuit Hobbs posted last week? >> >> ...Jim Thompson >> > >No, mine was a buck-boost, whereas John has posted a few capacitively >coupled boosts, of which this is one. > >The nice thing about doing it his way is that you get some >cross-regulation, because one polarity adjusts the voltage swing on the >inductor, whereas I get the full input voltage variation impressed on >the HV and have to get rid of it afterwards. > >The efficiency is comparatively poor for some reason that I haven't >looked into very deeply--if you filter the current draw from V1 using a >100 milliohm/1 millifarad RC lowpass to get rid of the spikes, and compute > >(V(VP)*I(R5)+V(VN)*I(R6))/(-16*I(V1)), it never gets above about 0.3.
It has tons of switching losses. It needs a smaller fet and needs to run at lower frequency. I hacked that fast and had to go to Safeway. I'm running a similar thing, my 9-to-48 booster, and it sims over 90% and runs about 85 in real life. https://dl.dropboxusercontent.com/u/53724080/PCBs/D14.jpg (3 kilowatt laser driver) I like these schmitt-trigger switchers. You get to turn all the knobs yourself. -- John Larkin Highland Technology Inc www.highlandtechnology.com jlarkin at highlandtechnology dot com Precision electronic instrumentation Picosecond-resolution Digital Delay and Pulse generators Custom timing and laser controllers Photonics and fiberoptic TTL data links VME analog, thermocouple, LVDT, synchro, tachometer Multichannel arbitrary waveform generators
"John Larkin" <jjlarkin@highNOTlandTHIStechnologyPART.com> wrote in message
> > I like these schmitt-trigger switchers. You get to turn all the knobs > yourself. >
Here is Jl's PSU suitable for production. Note the rise and fall times have been soften. Version 4 SHEET 1 1180 680 WIRE 368 -272 320 -272 WIRE 496 -272 432 -272 WIRE 560 -272 496 -272 WIRE 832 -272 624 -272 WIRE 928 -272 832 -272 WIRE 992 -272 928 -272 WIRE 992 -240 992 -272 WIRE 832 -224 832 -272 WIRE 496 -208 496 -272 WIRE 16 -160 -80 -160 WIRE 128 -160 16 -160 WIRE 272 -160 208 -160 WIRE 320 -160 320 -272 WIRE 320 -160 272 -160 WIRE 16 -128 16 -160 WIRE 496 -112 496 -144 WIRE 832 -112 832 -160 WIRE 992 -112 992 -160 WIRE 320 -32 320 -160 WIRE 368 -32 320 -32 WIRE 496 -32 432 -32 WIRE 576 -32 496 -32 WIRE 832 -32 640 -32 WIRE 928 -32 832 -32 WIRE 992 -32 928 -32 WIRE 16 -16 16 -48 WIRE 496 0 496 -32 WIRE 992 0 992 -32 WIRE -528 16 -544 16 WIRE -512 16 -528 16 WIRE 832 16 832 -32 WIRE -544 48 -544 16 WIRE -80 80 -80 -160 WIRE 320 96 320 -32 WIRE 496 112 496 64 WIRE 832 128 832 80 WIRE 992 128 992 80 WIRE -240 144 -480 144 WIRE 112 176 80 176 WIRE 160 176 112 176 WIRE 272 176 240 176 WIRE -544 208 -544 128 WIRE -480 208 -480 144 WIRE -480 208 -544 208 WIRE -384 208 -416 208 WIRE -272 208 -304 208 WIRE -240 208 -272 208 WIRE -544 272 -544 208 WIRE -240 272 -400 272 WIRE -400 288 -400 272 WIRE 176 304 80 304 WIRE 224 304 176 304 WIRE 320 304 320 192 WIRE 320 304 304 304 WIRE 368 304 320 304 WIRE 528 304 448 304 WIRE -240 336 -272 336 WIRE -400 384 -400 368 WIRE -304 384 -400 384 WIRE -272 384 -272 336 WIRE -272 384 -304 384 WIRE 176 384 176 304 WIRE 528 384 528 304 WIRE -400 400 -400 384 WIRE -272 432 -272 384 WIRE 112 496 112 176 WIRE 112 496 -208 496 WIRE -208 512 -208 496 WIRE -208 512 -224 512 FLAG 528 384 0 FLAG -80 400 0 FLAG 832 128 0 FLAG 16 -16 0 FLAG 496 112 0 FLAG 832 -112 0 FLAG 496 -112 0 FLAG 992 -112 0 FLAG 992 128 0 FLAG 928 -32 VP FLAG 928 -272 VN FLAG 272 -160 D FLAG -544 352 0 FLAG -528 16 VP FLAG 176 448 0 FLAG -400 464 0 FLAG -272 528 0 FLAG 112 176 VG FLAG 320 304 IS FLAG -304 384 RT FLAG -272 208 CP SYMBOL nmos 272 96 R0 WINDOW 0 101 34 Left 2 WINDOW 3 76 70 Left 2 SYMATTR InstName M1 SYMATTR Value FDS3570 SYMBOL res 352 320 R270 WINDOW 0 32 56 VTop 2 WINDOW 3 0 56 VBottom 2 SYMATTR InstName R1 SYMATTR Value 0.7 SYMBOL schottky 576 -16 R270 WINDOW 0 -40 31 VTop 2 WINDOW 3 -41 34 VBottom 2 SYMATTR InstName D1 SYMATTR Value BAT46WJ SYMATTR Description Diode SYMATTR Type diode SYMBOL ind2 112 -144 R270 WINDOW 0 94 58 VTop 2 WINDOW 3 81 58 VBottom 2 SYMATTR InstName L1 SYMATTR Value 500&#2013266101; SYMATTR Type ind SYMBOL cap 816 16 R0 WINDOW 0 59 31 Left 2 WINDOW 3 55 65 Left 2 SYMATTR InstName C1 SYMATTR Value 1&#2013266101; SYMBOL res 320 288 R90 WINDOW 0 0 78 VBottom 2 WINDOW 3 38 62 VTop 2 SYMATTR InstName R2 SYMATTR Value 1K SYMBOL voltage 16 -144 R0 WINDOW 0 51 45 Left 2 WINDOW 3 54 81 Left 2 WINDOW 123 0 0 Left 2 WINDOW 39 0 0 Left 2 SYMATTR InstName V1 SYMATTR Value 16 SYMBOL schottky 512 64 R180 WINDOW 0 66 33 Left 2 WINDOW 3 41 -7 Left 2 SYMATTR InstName D4 SYMATTR Value BAT46WJ SYMATTR Description Diode SYMATTR Type diode SYMBOL cap 432 -48 R90 WINDOW 0 -52 29 VBottom 2 WINDOW 3 -42 27 VTop 2 SYMATTR InstName C4 SYMATTR Value 10&#2013266101; SYMBOL schottky 624 -288 R90 WINDOW 0 65 -24 VBottom 2 WINDOW 3 67 -26 VTop 2 SYMATTR InstName D6 SYMATTR Value BAT46WJ SYMATTR Description Diode SYMATTR Type diode SYMBOL cap 816 -224 R0 WINDOW 0 62 24 Left 2 WINDOW 3 58 57 Left 2 SYMATTR InstName C6 SYMATTR Value 1&#2013266101; SYMBOL cap 432 -288 R90 WINDOW 0 72 32 VBottom 2 WINDOW 3 81 32 VTop 2 SYMATTR InstName C7 SYMATTR Value 10&#2013266101; SYMBOL schottky 480 -208 R0 WINDOW 0 84 51 Left 2 WINDOW 3 59 85 Left 2 SYMATTR InstName D7 SYMATTR Value BAT46WJ SYMATTR Description Diode SYMATTR Type diode SYMBOL res 976 -256 R0 WINDOW 0 62 50 Left 2 WINDOW 3 62 81 Left 2 SYMATTR InstName R5 SYMATTR Value 2K SYMBOL res 976 -16 R0 WINDOW 0 61 41 Left 2 WINDOW 3 61 75 Left 2 SYMATTR InstName R6 SYMATTR Value 2K SYMBOL res 256 160 R90 WINDOW 0 -44 55 VBottom 2 WINDOW 3 -38 56 VTop 2 SYMATTR InstName R7 SYMATTR Value 22 SYMBOL PowerProducts\\LT1242 -80 240 R0 SYMATTR InstName U1 SYMBOL res -288 192 R90 WINDOW 0 0 56 VBottom 2 WINDOW 3 32 56 VTop 2 SYMATTR InstName R4 SYMATTR Value 68K SYMBOL cap -416 192 R90 WINDOW 0 0 32 VBottom 2 WINDOW 3 32 32 VTop 2 SYMATTR InstName C3 SYMATTR Value 10n SYMBOL res -560 256 R0 SYMATTR InstName R8 SYMATTR Value 10K SYMBOL res -560 32 R0 SYMATTR InstName R9 SYMATTR Value 170K SYMBOL cap 160 384 R0 WINDOW 3 46 44 Left 2 SYMATTR InstName C5 SYMATTR Value 1n SYMBOL cap -416 400 R0 SYMATTR InstName C8 SYMATTR Value 510p SYMBOL res -416 272 R0 SYMATTR InstName R10 SYMATTR Value 10K SYMBOL nmos -224 432 M0 SYMATTR InstName M2 SYMATTR Value 2N7002 TEXT 792 320 Left 2 !.tran 2m uic TEXT 696 384 Left 2 ;Bipolar Boost JL July 2013 TEXT 696 416 Left 2 ;SOFT SWITCHED HD 22/JLY/13 Cheers, Harry