micropower boost circuit idea

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As shown, starts up from ~0.75 volts and can provide several mA into a  
load, output tracking the full ~15 volts above the input voltage once  
the input comes above 1 volt.  With a logic-level MOSFET for M1 and a  
germanium transistor for Q1, it would probably start significantly  
lower. The comparator and regulator don't have to be the expensive LT  
parts, they're just an example. 1:1 CT ADSL transformers are really  
cheap, too.

Version 4
SHEET 1 2020 852
WIRE -176 -384 -624 -384
WIRE 1424 -384 -176 -384
WIRE -352 -272 -560 -272
WIRE -352 -224 -352 -272
WIRE -176 -224 -176 -384
WIRE -560 -176 -560 -272
WIRE -496 -176 -560 -176
WIRE -384 -176 -416 -176
WIRE -240 -176 -288 -176
WIRE -624 0 -624 -384
WIRE -496 0 -624 0
WIRE -384 0 -416 0
WIRE -288 0 -336 0
WIRE -176 0 -176 -128
WIRE -176 0 -208 0
WIRE 256 32 -32 32
WIRE 544 32 320 32
WIRE -560 160 -560 -176
WIRE -496 160 -560 160
WIRE -384 160 -336 0
WIRE -384 160 -416 160
WIRE -336 160 -384 0
WIRE -288 160 -336 160
WIRE -160 160 -208 160
WIRE -96 160 -112 160
WIRE -32 160 -32 32
WIRE -32 160 -96 160
WIRE 16 160 -32 160
WIRE 144 160 80 160
WIRE 288 160 144 160
WIRE 432 160 288 160
WIRE 640 160 432 160
WIRE 864 160 640 160
WIRE 1424 176 1424 -384
WIRE 1424 176 1200 176
WIRE 864 208 864 160
WIRE -384 240 -384 160
WIRE 432 240 432 160
WIRE 1424 272 1424 176
WIRE 640 320 640 160
WIRE 736 320 640 320
WIRE 1072 320 992 320
WIRE -336 352 -336 160
WIRE -32 384 -32 160
WIRE 144 384 144 160
WIRE 288 384 288 160
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WIRE 432 400 320 400
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WIRE 544 400 432 400
WIRE 624 400 544 400
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WIRE -384 432 -448 432
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WIRE 1072 480 1072 320
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WIRE 864 512 864 432
WIRE -448 528 -448 432
WIRE 1424 656 1424 352
WIRE -336 672 -336 448
WIRE -32 672 -32 448
WIRE 144 672 144 448
WIRE 288 672 288 448
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WIRE 544 672 544 576
WIRE 624 672 624 592
WIRE 1072 672 1072 560
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WIRE 224 720 224 416
WIRE 224 720 -448 720
WIRE 864 736 864 576
WIRE 1200 736 1200 176
WIRE 1200 736 864 736
FLAG 1424 656 0
FLAG -336 672 0
FLAG -32 672 0
FLAG 144 672 0
FLAG -384 240 0
FLAG 288 672 0
FLAG 544 672 0
FLAG 1072 672 0
FLAG 624 672 0
FLAG 368 672 0
SYMBOL voltage 1424 256 R0
WINDOW 123 0 0 Left 2
WINDOW 39 24 124 Left 2
SYMATTR SpiceLine Rser=0.01
SYMATTR InstName V1
SYMATTR Value 0.8
SYMBOL ind2 -512 16 R270
WINDOW 0 32 56 VTop 2
WINDOW 3 4 56 VBottom 2
SYMATTR InstName L1
SYMATTR Value 100H
SYMBOL ind2 -192 -16 R90
WINDOW 0 4 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName L2
SYMATTR Value 100H
SYMBOL ind2 -400 144 R90
WINDOW 0 4 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName L3
SYMATTR Value 100H
SYMBOL ind2 -304 176 R270
WINDOW 0 32 56 VTop 2
WINDOW 3 4 56 VBottom 2
SYMATTR InstName L4
SYMATTR Value 100H
SYMBOL schottky -16 448 R180
WINDOW 0 24 64 Left 2
WINDOW 3 24 0 Left 2
SYMATTR InstName D2
SYMATTR Value 1N5817
SYMATTR Description Diode
SYMATTR Type diode
SYMBOL nmos -384 352 R0
SYMATTR InstName M1
SYMATTR Value 2N7002
SYMBOL cap 160 448 R180
WINDOW 0 24 56 Left 2
WINDOW 3 24 8 Left 2
SYMATTR InstName C2
SYMATTR Value 4.7F
SYMBOL schottky 16 176 R270
WINDOW 0 32 32 VTop 2
WINDOW 3 0 32 VBottom 2
SYMATTR InstName D1
SYMATTR Value 1N5817
SYMATTR Description Diode
SYMATTR Type diode
SYMBOL pnp -240 -128 M180
SYMATTR InstName Q1
SYMATTR Value 2N2907
SYMBOL Comparators\LT1018 288 416 M0
SYMATTR InstName U1
SYMBOL diode 560 576 R180
WINDOW 0 24 64 Left 2
WINDOW 3 24 98 Left 2
SYMATTR InstName D3
SYMATTR Value 1N4148
SYMBOL res 1056 464 R0
SYMATTR InstName R3
SYMATTR Value 4.7k
SYMBOL res 608 496 R0
SYMATTR InstName R4
SYMATTR Value 4.7k
SYMBOL res -464 512 R0
SYMATTR InstName R5
SYMATTR Value 100
SYMBOL PowerProducts\LT3080 864 320 R0
SYMATTR InstName U3
SYMBOL zener 880 576 R180
WINDOW 0 24 64 Left 2
WINDOW 3 24 0 Left 2
SYMATTR InstName D5
SYMATTR Value BZX84C15L
SYMBOL cap 320 16 R90
WINDOW 0 0 32 VBottom 2
WINDOW 3 32 32 VTop 2
SYMATTR InstName C3
SYMATTR Value 470p
SYMBOL cap -96 144 R90
WINDOW 0 0 32 VBottom 2
WINDOW 3 32 32 VTop 2
SYMATTR InstName C1
SYMATTR Value 4.7F
SYMBOL njf -288 -224 R90
SYMATTR InstName J1
SYMATTR Value 2N4338
SYMBOL res -400 -192 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R1
SYMATTR Value 10k
SYMBOL zener 448 304 R180
WINDOW 0 24 64 Left 2
WINDOW 3 24 0 Left 2
SYMATTR InstName D4
SYMATTR Value DFLZ33
TEXT -776 712 Left 2 !.tran 0 10 0 10u startup
TEXT -768 680 Left 2 !K L1 L2 L3 L4 0.99
TEXT 1032 280 Left 2 ;RLOAD
TEXT -432 -56 Left 2 ;ADSL XFRMR

Re: micropower boost circuit idea
On 9/24/2013 5:49 AM, bitrex wrote:
Quoted text here. Click to load it

This version gets rid of the linear regulator: simpler and more efficient:

Version 4
SHEET 1 2020 852
WIRE -176 -384 -624 -384
WIRE 816 -384 -176 -384
WIRE -352 -272 -560 -272
WIRE -352 -224 -352 -272
WIRE -176 -224 -176 -384
WIRE -560 -176 -560 -272
WIRE -496 -176 -560 -176
WIRE -384 -176 -416 -176
WIRE -240 -176 -288 -176
WIRE -624 0 -624 -384
WIRE -496 0 -624 0
WIRE -384 0 -416 0
WIRE -288 0 -336 0
WIRE -176 0 -176 -128
WIRE -176 0 -208 0
WIRE 176 32 -32 32
WIRE 464 32 240 32
WIRE -560 160 -560 -176
WIRE -496 160 -560 160
WIRE -384 160 -336 0
WIRE -384 160 -416 160
WIRE -336 160 -384 0
WIRE -288 160 -336 160
WIRE -160 160 -208 160
WIRE -96 160 -112 160
WIRE -32 160 -32 32
WIRE -32 160 -96 160
WIRE 16 160 -32 160
WIRE 144 160 80 160
WIRE 288 160 144 160
WIRE 544 160 288 160
WIRE 640 160 544 160
WIRE 816 176 816 -384
WIRE 816 176 736 176
WIRE -384 240 -384 160
WIRE 544 256 544 160
WIRE 816 288 816 176
WIRE -336 352 -336 160
WIRE -32 384 -32 160
WIRE 144 384 144 160
WIRE 288 384 288 160
WIRE 640 384 640 160
WIRE 464 400 464 32
WIRE 464 400 320 400
WIRE 544 400 544 320
WIRE 544 400 464 400
WIRE 256 416 224 416
WIRE -384 432 -448 432
WIRE 368 432 320 432
WIRE 544 496 544 400
WIRE 464 512 464 400
WIRE -448 528 -448 432
WIRE -336 672 -336 448
WIRE -32 672 -32 448
WIRE 144 672 144 448
WIRE 288 672 288 448
WIRE 368 672 368 432
WIRE 464 672 464 576
WIRE 544 672 544 576
WIRE 640 672 640 464
WIRE 816 672 816 368
WIRE -448 720 -448 608
WIRE 224 720 224 416
WIRE 224 720 -448 720
FLAG 816 672 0
FLAG -336 672 0
FLAG -384 240 0
FLAG 736 176 Vin
FLAG -32 672 Vin
FLAG 144 672 Vin
FLAG 288 672 Vin
FLAG 368 672 Vin
FLAG 464 672 Vin
FLAG 544 672 Vin
FLAG 640 672 Vin
SYMBOL voltage 816 272 R0
WINDOW 123 0 0 Left 2
WINDOW 39 24 124 Left 2
SYMATTR SpiceLine Rser=0.01
SYMATTR InstName V1
SYMATTR Value 0.8
SYMBOL ind2 -512 16 R270
WINDOW 0 32 56 VTop 2
WINDOW 3 4 56 VBottom 2
SYMATTR InstName L1
SYMATTR Value 100H
SYMBOL ind2 -192 -16 R90
WINDOW 0 4 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName L2
SYMATTR Value 100H
SYMBOL ind2 -400 144 R90
WINDOW 0 4 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName L3
SYMATTR Value 100H
SYMBOL ind2 -304 176 R270
WINDOW 0 32 56 VTop 2
WINDOW 3 4 56 VBottom 2
SYMATTR InstName L4
SYMATTR Value 100H
SYMBOL schottky -16 448 R180
WINDOW 0 24 64 Left 2
WINDOW 3 24 0 Left 2
SYMATTR InstName D2
SYMATTR Value 1N5817
SYMATTR Description Diode
SYMATTR Type diode
SYMBOL nmos -384 352 R0
SYMATTR InstName M1
SYMATTR Value 2N7002
SYMBOL cap 160 448 R180
WINDOW 0 24 56 Left 2
WINDOW 3 24 8 Left 2
SYMATTR InstName C2
SYMATTR Value 4.7F
SYMBOL schottky 16 176 R270
WINDOW 0 32 32 VTop 2
WINDOW 3 0 32 VBottom 2
SYMATTR InstName D1
SYMATTR Value 1N5817
SYMATTR Description Diode
SYMATTR Type diode
SYMBOL pnp -240 -128 M180
SYMATTR InstName Q1
SYMATTR Value 2N2907
SYMBOL diode 480 576 R180
WINDOW 0 24 64 Left 2
WINDOW 3 24 98 Left 2
SYMATTR InstName D3
SYMATTR Value 1N4148
SYMBOL res -464 512 R0
SYMATTR InstName R5
SYMATTR Value 100
SYMBOL cap 240 16 R90
WINDOW 0 0 32 VBottom 2
WINDOW 3 32 32 VTop 2
SYMATTR InstName C3
SYMATTR Value 470p
SYMBOL cap -96 144 R90
WINDOW 0 0 32 VBottom 2
WINDOW 3 32 32 VTop 2
SYMATTR InstName C1
SYMATTR Value 4.7F
SYMBOL njf -288 -224 R90
SYMATTR InstName J1
SYMATTR Value 2N4338
SYMBOL res -400 -192 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R1
SYMATTR Value 10k
SYMBOL Comparators\LT1018 288 416 M0
SYMATTR InstName U1
SYMBOL res 528 480 R0
SYMATTR InstName R4
SYMATTR Value 4.7k
SYMBOL res 624 368 R0
SYMATTR InstName R2
SYMATTR Value 4.7k
SYMBOL zener 560 320 R180
WINDOW 0 24 64 Left 2
WINDOW 3 24 0 Left 2
SYMATTR InstName D4
SYMATTR Value BZX84C15L
TEXT -776 712 Left 2 !.tran 0 10 0 10u startup uic
TEXT -768 680 Left 2 !K L1 L2 L3 L4 0.99
TEXT -432 -48 Left 2 ;ADSL XFRMR



Re: micropower boost circuit idea
On 9/24/2013 9:23 AM, bitrex wrote:
Quoted text here. Click to load it

No, this version is VERY BAD! A big problem.  Even so, there should be a  
way to float the output so the linear regulator isn't needed.  I'll work  
on it more.

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