12v automotive SSR, to replace a failed $35 unit in my car.
Q3
| |-------+---O
| |<-. |
D2 .---+-------+---' |--+ .---'
.-----. | |C1 | | / \ TVS
.--------------------|~ +|--' |10nF .-. R4 | ---
| T1b 500uH | | --- | | 22K | |
'-----. . . . .------|~ -|--. --- '-' | |
'-'-'-'-' '-----' | | | | |
--------- '---+-------+--------+----+---O
---------
.-.-.-.-.
.------' ' | ' '-------.
| T1a| 1mH |
| | |
O--------+----+----. |
| | | |
| .-. .-. |
| R1 | | R2 | | |
|10K | | 10K | | |
| '-' '-' |
| | ===== | |
\| | .-.-. | |/
|---+--' ' '--+----|
.<| T1c |>.
| Q1 10uH Q2 |
| |
'----------+-----------'
|
.-.
| | R3
| | 470
'-'
|
|
LED1 V ~~>
---
|
|
V D1
---
|
O------------'
Cheers,
James Arthur
----
Version 4
SHEET 1 984 680
WIRE 880 -144 816 -144
WIRE 352 -64 208 -64
WIRE 368 -64 352 -64
WIRE 464 -64 432 -64
WIRE 656 -64 464 -64
WIRE 704 -64 656 -64
WIRE 768 -64 704 -64
WIRE 352 -48 352 -64
WIRE 464 -48 464 -64
WIRE 656 -48 656 -64
WIRE 704 -48 704 -64
WIRE 880 -48 880 -144
WIRE 880 -48 816 -48
WIRE 208 32 208 -64
WIRE 352 32 352 16
WIRE 352 32 288 32
WIRE 368 32 352 32
WIRE 464 32 464 16
WIRE 464 32 432 32
WIRE 816 48 816 -48
WIRE 464 64 464 32
WIRE 656 64 656 16
WIRE 704 64 704 32
WIRE 160 128 80 128
WIRE 256 128 240 128
WIRE 272 128 256 128
WIRE 416 128 352 128
WIRE -176 176 -224 176
WIRE -48 176 -112 176
WIRE 176 176 16 176
WIRE 256 176 256 128
WIRE 256 176 176 176
WIRE 320 176 256 176
WIRE 176 208 176 176
WIRE 320 208 320 176
WIRE -224 224 -224 176
WIRE 80 256 80 128
WIRE 416 256 416 128
WIRE 176 304 176 288
WIRE 176 304 144 304
WIRE 208 304 176 304
WIRE 320 304 320 288
WIRE 320 304 288 304
WIRE 352 304 320 304
WIRE -224 336 -224 304
WIRE 80 384 80 352
WIRE 256 384 80 384
WIRE 416 384 416 352
WIRE 416 384 256 384
WIRE 256 400 256 384
WIRE 256 496 256 480
FLAG 256 496 0
FLAG -224 336 0
FLAG 464 64 0
FLAG 656 64 0
FLAG 704 64 0
FLAG 816 48 0
SYMBOL ind2 144 144 R270
WINDOW 0 32 56 VTop 2
WINDOW 3 5 56 VBottom 2
SYMATTR InstName L1
SYMATTR Value 500�H
SYMATTR Type ind
SYMBOL ind2 256 144 R270
WINDOW 0 32 56 VTop 2
WINDOW 3 5 56 VBottom 2
SYMATTR InstName L2
SYMATTR Value 500�H
SYMATTR Type ind
SYMBOL ind2 304 16 R90
WINDOW 0 5 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName L3
SYMATTR Value 500�H
SYMATTR Type ind
SYMBOL npn 352 256 R0
SYMATTR InstName Q1
SYMATTR Value 2N3904
SYMBOL npn 144 256 M0
SYMATTR InstName Q2
SYMATTR Value 2N3904
SYMBOL res 160 192 R0
SYMATTR InstName R1
SYMATTR Value 10K
SYMBOL res 240 384 R0
SYMATTR InstName R2
SYMATTR Value 470
SYMBOL ind2 304 288 R90
WINDOW 0 5 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName L4
SYMATTR Value 10�H
SYMATTR Type ind
SYMBOL res 304 192 R0
SYMATTR InstName R3
SYMATTR Value 10K
SYMBOL voltage -224 208 R0
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
SYMATTR InstName V1
SYMATTR Value PULSE(0 12 0 0 0 5mS)
SYMBOL diode 368 -48 R270
WINDOW 0 32 32 VTop 2
WINDOW 3 0 32 VBottom 2
SYMATTR InstName D1
SYMATTR Value 1N4148
SYMBOL nmos 768 -144 R0
SYMATTR InstName M1
SYMATTR Value AP9465GEM
SYMBOL cap 640 -48 R0
WINDOW 0 -38 41 Left 2
WINDOW 3 -33 66 Left 2
SYMATTR InstName C1
SYMATTR Value 10nF
SYMBOL res 688 -64 R0
SYMATTR InstName R4
SYMATTR Value 22k
SYMBOL diode 432 16 R90
WINDOW 0 0 32 VBottom 2
WINDOW 3 32 32 VTop 2
SYMATTR InstName D2
SYMATTR Value 1N4148
SYMBOL diode 368 16 R180
WINDOW 0 24 64 Left 2
WINDOW 3 24 0 Left 2
SYMATTR InstName D3
SYMATTR Value 1N4148
SYMBOL diode 480 16 R180
WINDOW 0 24 64 Left 2
WINDOW 3 24 0 Left 2
SYMATTR InstName D4
SYMATTR Value 1N4148
SYMBOL LED -176 192 R270
WINDOW 0 32 32 VTop 2
WINDOW 3 0 32 VBottom 2
SYMATTR InstName D5
SYMATTR Value QTLP690C
SYMATTR Description Diode
SYMATTR Type diode
SYMBOL diode -48 192 R270
WINDOW 0 32 32 VTop 2
WINDOW 3 0 32 VBottom 2
SYMATTR InstName D6
SYMATTR Value 1N4148
TEXT 512 240 Left 2 !K1 L1 L2 L3 L4 1.
TEXT 536 296 Left 2 !.tran 10mS
TEXT 520 168 Left 2 ;29-Sep-2015 by jda
A very silly circuit
Started by ●October 3, 2015
Reply by ●October 3, 20152015-10-03
On Sat, 3 Oct 2015 11:09:40 -0700 (PDT), dagmargoodboat@yahoo.com wrote: PV optocouplers are cool for driving isolated gates, but maybe not available in your junk box. I'm designing a kilovolt-range linear voltage regulator, and a PV is a really easy way to drive the pass transistor gate. Hey, a packaged SIP dc/dc converter would make a nice SSR gate driver. $4 or something from Mouser.>12v automotive SSR, to replace a failed $35 unit in my car. > > Q3 > | |-------+---O > | |<-. | > D2 .---+-------+---' |--+ .---' > .-----. | |C1 | | / \ TVS > .--------------------|~ +|--' |10nF .-. R4 | --- > | T1b 500uH | | --- | | 22K | | > '-----. . . . .------|~ -|--. --- '-' | | > '-'-'-'-' '-----' | | | | | > --------- '---+-------+--------+----+---O > --------- > .-.-.-.-. > .------' ' | ' '-------. > | T1a| 1mH | > | | | > O--------+----+----. | > | | | | > | .-. .-. | > | R1 | | R2 | | | > |10K | | 10K | | | > | '-' '-' | > | | ===== | | > \| | .-.-. | |/ > |---+--' ' '--+----| > .<| T1c |>. > | Q1 10uH Q2 | > | | > '----------+-----------' > | > .-. > | | R3 > | | 470 > '-' > | > | > LED1 V ~~> > --- > | > | > V D1 > --- > | > O------------' > >Cheers, >James Arthur >---- > >Version 4 >SHEET 1 984 680 >WIRE 880 -144 816 -144 >WIRE 352 -64 208 -64 >WIRE 368 -64 352 -64 >WIRE 464 -64 432 -64 >WIRE 656 -64 464 -64 >WIRE 704 -64 656 -64 >WIRE 768 -64 704 -64 >WIRE 352 -48 352 -64 >WIRE 464 -48 464 -64 >WIRE 656 -48 656 -64 >WIRE 704 -48 704 -64 >WIRE 880 -48 880 -144 >WIRE 880 -48 816 -48 >WIRE 208 32 208 -64 >WIRE 352 32 352 16 >WIRE 352 32 288 32 >WIRE 368 32 352 32 >WIRE 464 32 464 16 >WIRE 464 32 432 32 >WIRE 816 48 816 -48 >WIRE 464 64 464 32 >WIRE 656 64 656 16 >WIRE 704 64 704 32 >WIRE 160 128 80 128 >WIRE 256 128 240 128 >WIRE 272 128 256 128 >WIRE 416 128 352 128 >WIRE -176 176 -224 176 >WIRE -48 176 -112 176 >WIRE 176 176 16 176 >WIRE 256 176 256 128 >WIRE 256 176 176 176 >WIRE 320 176 256 176 >WIRE 176 208 176 176 >WIRE 320 208 320 176 >WIRE -224 224 -224 176 >WIRE 80 256 80 128 >WIRE 416 256 416 128 >WIRE 176 304 176 288 >WIRE 176 304 144 304 >WIRE 208 304 176 304 >WIRE 320 304 320 288 >WIRE 320 304 288 304 >WIRE 352 304 320 304 >WIRE -224 336 -224 304 >WIRE 80 384 80 352 >WIRE 256 384 80 384 >WIRE 416 384 416 352 >WIRE 416 384 256 384 >WIRE 256 400 256 384 >WIRE 256 496 256 480 >FLAG 256 496 0 >FLAG -224 336 0 >FLAG 464 64 0 >FLAG 656 64 0 >FLAG 704 64 0 >FLAG 816 48 0 >SYMBOL ind2 144 144 R270 >WINDOW 0 32 56 VTop 2 >WINDOW 3 5 56 VBottom 2 >SYMATTR InstName L1 >SYMATTR Value 500�H >SYMATTR Type ind >SYMBOL ind2 256 144 R270 >WINDOW 0 32 56 VTop 2 >WINDOW 3 5 56 VBottom 2 >SYMATTR InstName L2 >SYMATTR Value 500�H >SYMATTR Type ind >SYMBOL ind2 304 16 R90 >WINDOW 0 5 56 VBottom 2 >WINDOW 3 32 56 VTop 2 >SYMATTR InstName L3 >SYMATTR Value 500�H >SYMATTR Type ind >SYMBOL npn 352 256 R0 >SYMATTR InstName Q1 >SYMATTR Value 2N3904 >SYMBOL npn 144 256 M0 >SYMATTR InstName Q2 >SYMATTR Value 2N3904 >SYMBOL res 160 192 R0 >SYMATTR InstName R1 >SYMATTR Value 10K >SYMBOL res 240 384 R0 >SYMATTR InstName R2 >SYMATTR Value 470 >SYMBOL ind2 304 288 R90 >WINDOW 0 5 56 VBottom 2 >WINDOW 3 32 56 VTop 2 >SYMATTR InstName L4 >SYMATTR Value 10�H >SYMATTR Type ind >SYMBOL res 304 192 R0 >SYMATTR InstName R3 >SYMATTR Value 10K >SYMBOL voltage -224 208 R0 >WINDOW 123 0 0 Left 2 >WINDOW 39 0 0 Left 2 >SYMATTR InstName V1 >SYMATTR Value PULSE(0 12 0 0 0 5mS) >SYMBOL diode 368 -48 R270 >WINDOW 0 32 32 VTop 2 >WINDOW 3 0 32 VBottom 2 >SYMATTR InstName D1 >SYMATTR Value 1N4148 >SYMBOL nmos 768 -144 R0 >SYMATTR InstName M1 >SYMATTR Value AP9465GEM >SYMBOL cap 640 -48 R0 >WINDOW 0 -38 41 Left 2 >WINDOW 3 -33 66 Left 2 >SYMATTR InstName C1 >SYMATTR Value 10nF >SYMBOL res 688 -64 R0 >SYMATTR InstName R4 >SYMATTR Value 22k >SYMBOL diode 432 16 R90 >WINDOW 0 0 32 VBottom 2 >WINDOW 3 32 32 VTop 2 >SYMATTR InstName D2 >SYMATTR Value 1N4148 >SYMBOL diode 368 16 R180 >WINDOW 0 24 64 Left 2 >WINDOW 3 24 0 Left 2 >SYMATTR InstName D3 >SYMATTR Value 1N4148 >SYMBOL diode 480 16 R180 >WINDOW 0 24 64 Left 2 >WINDOW 3 24 0 Left 2 >SYMATTR InstName D4 >SYMATTR Value 1N4148 >SYMBOL LED -176 192 R270 >WINDOW 0 32 32 VTop 2 >WINDOW 3 0 32 VBottom 2 >SYMATTR InstName D5 >SYMATTR Value QTLP690C >SYMATTR Description Diode >SYMATTR Type diode >SYMBOL diode -48 192 R270 >WINDOW 0 32 32 VTop 2 >WINDOW 3 0 32 VBottom 2 >SYMATTR InstName D6 >SYMATTR Value 1N4148 >TEXT 512 240 Left 2 !K1 L1 L2 L3 L4 1. >TEXT 536 296 Left 2 !.tran 10mS >TEXT 520 168 Left 2 ;29-Sep-2015 by jda
Reply by ●October 3, 20152015-10-03
On 10/3/2015 4:58 PM, John Larkin wrote:> On Sat, 3 Oct 2015 11:09:40 -0700 (PDT), dagmargoodboat@yahoo.com > wrote: > > > PV optocouplers are cool for driving isolated gates, but maybe not > available in your junk box. > > I'm designing a kilovolt-range linear voltage regulator, and a PV is a > really easy way to drive the pass transistor gate. > > Hey, a packaged SIP dc/dc converter would make a nice SSR gate driver. > $4 or something from Mouser.That is the point of this circuit. A PV photocoupler needs a power source. This circuit *is* the power source.>> 12v automotive SSR, to replace a failed $35 unit in my car. >> >> Q3 >> | |-------+---O >> | |<-. | >> D2 .---+-------+---' |--+ .---' >> .-----. | |C1 | | / \ TVS >> .--------------------|~ +|--' |10nF .-. R4 | --- >> | T1b 500uH | | --- | | 22K | | >> '-----. . . . .------|~ -|--. --- '-' | | >> '-'-'-'-' '-----' | | | | | >> --------- '---+-------+--------+----+---O >> --------- >> .-.-.-.-. >> .------' ' | ' '-------. >> | T1a| 1mH | >> | | | >> O--------+----+----. | >> | | | | >> | .-. .-. | >> | R1 | | R2 | | | >> |10K | | 10K | | | >> | '-' '-' | >> | | ===== | | >> \| | .-.-. | |/ >> |---+--' ' '--+----| >> .<| T1c |>. >> | Q1 10uH Q2 | >> | | >> '----------+-----------' >> | >> .-. >> | | R3 >> | | 470 >> '-' >> | >> | >> LED1 V ~~> >> --- >> | >> | >> V D1 >> --- >> | >> O------------' >> >> Cheers, >> James Arthur >> ---- >> >> Version 4 >> SHEET 1 984 680 >> WIRE 880 -144 816 -144 >> WIRE 352 -64 208 -64 >> WIRE 368 -64 352 -64 >> WIRE 464 -64 432 -64 >> WIRE 656 -64 464 -64 >> WIRE 704 -64 656 -64 >> WIRE 768 -64 704 -64 >> WIRE 352 -48 352 -64 >> WIRE 464 -48 464 -64 >> WIRE 656 -48 656 -64 >> WIRE 704 -48 704 -64 >> WIRE 880 -48 880 -144 >> WIRE 880 -48 816 -48 >> WIRE 208 32 208 -64 >> WIRE 352 32 352 16 >> WIRE 352 32 288 32 >> WIRE 368 32 352 32 >> WIRE 464 32 464 16 >> WIRE 464 32 432 32 >> WIRE 816 48 816 -48 >> WIRE 464 64 464 32 >> WIRE 656 64 656 16 >> WIRE 704 64 704 32 >> WIRE 160 128 80 128 >> WIRE 256 128 240 128 >> WIRE 272 128 256 128 >> WIRE 416 128 352 128 >> WIRE -176 176 -224 176 >> WIRE -48 176 -112 176 >> WIRE 176 176 16 176 >> WIRE 256 176 256 128 >> WIRE 256 176 176 176 >> WIRE 320 176 256 176 >> WIRE 176 208 176 176 >> WIRE 320 208 320 176 >> WIRE -224 224 -224 176 >> WIRE 80 256 80 128 >> WIRE 416 256 416 128 >> WIRE 176 304 176 288 >> WIRE 176 304 144 304 >> WIRE 208 304 176 304 >> WIRE 320 304 320 288 >> WIRE 320 304 288 304 >> WIRE 352 304 320 304 >> WIRE -224 336 -224 304 >> WIRE 80 384 80 352 >> WIRE 256 384 80 384 >> WIRE 416 384 416 352 >> WIRE 416 384 256 384 >> WIRE 256 400 256 384 >> WIRE 256 496 256 480 >> FLAG 256 496 0 >> FLAG -224 336 0 >> FLAG 464 64 0 >> FLAG 656 64 0 >> FLAG 704 64 0 >> FLAG 816 48 0 >> SYMBOL ind2 144 144 R270 >> WINDOW 0 32 56 VTop 2 >> WINDOW 3 5 56 VBottom 2 >> SYMATTR InstName L1 >> SYMATTR Value 500�H >> SYMATTR Type ind >> SYMBOL ind2 256 144 R270 >> WINDOW 0 32 56 VTop 2 >> WINDOW 3 5 56 VBottom 2 >> SYMATTR InstName L2 >> SYMATTR Value 500�H >> SYMATTR Type ind >> SYMBOL ind2 304 16 R90 >> WINDOW 0 5 56 VBottom 2 >> WINDOW 3 32 56 VTop 2 >> SYMATTR InstName L3 >> SYMATTR Value 500�H >> SYMATTR Type ind >> SYMBOL npn 352 256 R0 >> SYMATTR InstName Q1 >> SYMATTR Value 2N3904 >> SYMBOL npn 144 256 M0 >> SYMATTR InstName Q2 >> SYMATTR Value 2N3904 >> SYMBOL res 160 192 R0 >> SYMATTR InstName R1 >> SYMATTR Value 10K >> SYMBOL res 240 384 R0 >> SYMATTR InstName R2 >> SYMATTR Value 470 >> SYMBOL ind2 304 288 R90 >> WINDOW 0 5 56 VBottom 2 >> WINDOW 3 32 56 VTop 2 >> SYMATTR InstName L4 >> SYMATTR Value 10�H >> SYMATTR Type ind >> SYMBOL res 304 192 R0 >> SYMATTR InstName R3 >> SYMATTR Value 10K >> SYMBOL voltage -224 208 R0 >> WINDOW 123 0 0 Left 2 >> WINDOW 39 0 0 Left 2 >> SYMATTR InstName V1 >> SYMATTR Value PULSE(0 12 0 0 0 5mS) >> SYMBOL diode 368 -48 R270 >> WINDOW 0 32 32 VTop 2 >> WINDOW 3 0 32 VBottom 2 >> SYMATTR InstName D1 >> SYMATTR Value 1N4148 >> SYMBOL nmos 768 -144 R0 >> SYMATTR InstName M1 >> SYMATTR Value AP9465GEM >> SYMBOL cap 640 -48 R0 >> WINDOW 0 -38 41 Left 2 >> WINDOW 3 -33 66 Left 2 >> SYMATTR InstName C1 >> SYMATTR Value 10nF >> SYMBOL res 688 -64 R0 >> SYMATTR InstName R4 >> SYMATTR Value 22k >> SYMBOL diode 432 16 R90 >> WINDOW 0 0 32 VBottom 2 >> WINDOW 3 32 32 VTop 2 >> SYMATTR InstName D2 >> SYMATTR Value 1N4148 >> SYMBOL diode 368 16 R180 >> WINDOW 0 24 64 Left 2 >> WINDOW 3 24 0 Left 2 >> SYMATTR InstName D3 >> SYMATTR Value 1N4148 >> SYMBOL diode 480 16 R180 >> WINDOW 0 24 64 Left 2 >> WINDOW 3 24 0 Left 2 >> SYMATTR InstName D4 >> SYMATTR Value 1N4148 >> SYMBOL LED -176 192 R270 >> WINDOW 0 32 32 VTop 2 >> WINDOW 3 0 32 VBottom 2 >> SYMATTR InstName D5 >> SYMATTR Value QTLP690C >> SYMATTR Description Diode >> SYMATTR Type diode >> SYMBOL diode -48 192 R270 >> WINDOW 0 32 32 VTop 2 >> WINDOW 3 0 32 VBottom 2 >> SYMATTR InstName D6 >> SYMATTR Value 1N4148 >> TEXT 512 240 Left 2 !K1 L1 L2 L3 L4 1. >> TEXT 536 296 Left 2 !.tran 10mS >> TEXT 520 168 Left 2 ;29-Sep-2015 by jda >-- Rick
Reply by ●October 3, 20152015-10-03
"John Larkin" <jjlarkin@highlandtechnology.com> wrote in message news:l2g01bhp7vk4e3u8r58vgag1ccik88qddh@4ax.com...> On Sat, 3 Oct 2015 11:09:40 -0700 (PDT), dagmargoodboat@yahoo.com > wrote: > > > PV optocouplers are cool for driving isolated gates, but maybe not > available in your junk box. > > I'm designing a kilovolt-range linear voltage regulator, and a PV is a > really easy way to drive the pass transistor gate. > > Hey, a packaged SIP dc/dc converter would make a nice SSR gate driver. > $4 or something from Mouser. > > > >>12v automotive SSR, to replace a failed $35 unit in my car.Since speed is not an issue, a 555 and a few capacitors in a doubler would work to drive the Mosfet.
Reply by ●October 3, 20152015-10-03
"rickman" <gnuarm@gmail.com> wrote in message news:muph5o$88r$2@dont-email.me...> On 10/3/2015 4:58 PM, John Larkin wrote: >> On Sat, 3 Oct 2015 11:09:40 -0700 (PDT), dagmargoodboat@yahoo.com >> wrote: >> >> >> PV optocouplers are cool for driving isolated gates, but maybe not >> available in your junk box. >> >> I'm designing a kilovolt-range linear voltage regulator, and a PV is a >> really easy way to drive the pass transistor gate. >> >> Hey, a packaged SIP dc/dc converter would make a nice SSR gate driver. >> $4 or something from Mouser. > > That is the point of this circuit. A PV photocoupler needs a power > source. This circuit *is* the power source. > >No, a PV optocoupler makes it own voltage. Just add it to the 12 volts to drive the gate.
Reply by ●October 3, 20152015-10-03
On 10/3/2015 5:57 PM, Tom Miller wrote:> > "rickman" <gnuarm@gmail.com> wrote in message > news:muph5o$88r$2@dont-email.me... >> On 10/3/2015 4:58 PM, John Larkin wrote: >>> On Sat, 3 Oct 2015 11:09:40 -0700 (PDT), dagmargoodboat@yahoo.com >>> wrote: >>> >>> >>> PV optocouplers are cool for driving isolated gates, but maybe not >>> available in your junk box. >>> >>> I'm designing a kilovolt-range linear voltage regulator, and a PV is a >>> really easy way to drive the pass transistor gate. >>> >>> Hey, a packaged SIP dc/dc converter would make a nice SSR gate driver. >>> $4 or something from Mouser. >> >> That is the point of this circuit. A PV photocoupler needs a power >> source. This circuit *is* the power source. >> >> > > No, a PV optocoupler makes it own voltage. Just add it to the 12 volts > to drive the gate.Since when? They use a phototransistor, not a PV solar cell. -- Rick
Reply by ●October 3, 20152015-10-03
On Saturday, October 3, 2015 at 4:58:28 PM UTC-4, John Larkin wrote:> On Sat, 3 Oct 2015 11:09:40 -0700 (PDT), dagmargoodboat@yahoo.com > wrote: > > > PV optocouplers are cool for driving isolated gates, but maybe not > available in your junk box.Exactly. I was also wanting reasonable switching times to avoid SOA problems.> I'm designing a kilovolt-range linear voltage regulator, and a PV is a > really easy way to drive the pass transistor gate. > > Hey, a packaged SIP dc/dc converter would make a nice SSR gate driver. > $4 or something from Mouser.I considered that. One of the surplus houses has a steal on DIP dc-dc converters, but I'd have to send off for 'em. I also considered direct-coupling and charge-pumps, but those were partsier. This was just for fun, to see what it would take. That's why it's a very silly circuit--I spent more time posting it than designing it. Dissipation is surprisingly high--just 10A through a 10 milliohn FET makes 1W, which is about as much as I'd want in the original tight, insulated box under the hood. IRL I swapped in a spare from a now-unused accessory. It's hard to beat relays for toughness and low contact resistance. The radiator cooling fan is the one that failed. The swapped-relay works, but I won't know until summer if the temp sensor driving its coil is good. :-) Cheers, James> >12v automotive SSR, to replace a failed $35 unit in my car. > > > > Q3 > > | |-------+---O > > | |<-. | > > D2 .---+-------+---' |--+ .---' > > .-----. | |C1 | | / \ TVS > > .--------------------|~ +|--' |10nF .-. R4 | --- > > | T1b 500uH | | --- | | 22K | | > > '-----. . . . .------|~ -|--. --- '-' | | > > '-'-'-'-' '-----' | | | | | > > --------- '---+-------+--------+----+---O > > --------- > > .-.-.-.-. > > .------' ' | ' '-------. > > | T1a| 1mH | > > | | | > > O--------+----+----. | > > | | | | > > | .-. .-. | > > | R1 | | R2 | | | > > |10K | | 10K | | | > > | '-' '-' | > > | | ===== | | > > \| | .-.-. | |/ > > |---+--' ' '--+----| > > .<| T1c |>. > > | Q1 10uH Q2 | > > | | > > '----------+-----------' > > | > > .-. > > | | R3 > > | | 470 > > '-' > > | > > | > > LED1 V ~~> > > --- > > | > > | > > V D1 > > --- > > | > > O------------' > > > >Cheers, > >James Arthur
Reply by ●October 3, 20152015-10-03
On Saturday, October 3, 2015 at 5:53:27 PM UTC-4, Tom Miller wrote:> "John Larkin" <jjlarkin@highlandtechnology.com> wrote in message > news:l2g01bhp7vk4e3u8r58vgag1ccik88qddh@4ax.com... > > On Sat, 3 Oct 2015 11:09:40 -0700 (PDT), dagmargoodboat@yahoo.com > > wrote: > > > > > > PV optocouplers are cool for driving isolated gates, but maybe not > > available in your junk box. > > > > I'm designing a kilovolt-range linear voltage regulator, and a PV is a > > really easy way to drive the pass transistor gate. > > > > Hey, a packaged SIP dc/dc converter would make a nice SSR gate driver. > > $4 or something from Mouser. > > > > > > > >>12v automotive SSR, to replace a failed $35 unit in my car. > > Since speed is not an issue, a 555 and a few capacitors in a doubler would > work to drive the Mosfet.Or even just a discrete oscillator in a charge-pump arrangement. I think the parts-counts work out to be about the same, and I just plain trust transistors to be tougher than ICs under the hood. Cheers, James Arthur
Reply by ●October 3, 20152015-10-03
On Saturday, October 3, 2015 at 6:09:24 PM UTC-4, rickman wrote:> On 10/3/2015 5:57 PM, Tom Miller wrote: > > > > "rickman" <gnuarm@gmail.com> wrote in message > > news:muph5o$88r$2@dont-email.me... > >> On 10/3/2015 4:58 PM, John Larkin wrote: > >>> On Sat, 3 Oct 2015 11:09:40 -0700 (PDT), dagmargoodboat@yahoo.com > >>> wrote: > >>> > >>> > >>> PV optocouplers are cool for driving isolated gates, but maybe not > >>> available in your junk box. > >>> > >>> I'm designing a kilovolt-range linear voltage regulator, and a PV is a > >>> really easy way to drive the pass transistor gate. > >>> > >>> Hey, a packaged SIP dc/dc converter would make a nice SSR gate driver. > >>> $4 or something from Mouser. > >> > >> That is the point of this circuit. A PV photocoupler needs a power > >> source. This circuit *is* the power source. > >> > >> > > > > No, a PV optocoupler makes it own voltage. Just add it to the 12 volts > > to drive the gate. > > Since when? They use a phototransistor, not a PV solar cell.The PV couplers John and Tom are talking about actually do exactly that--they couple an LED to a solar cell array, which drives a FET. They're slow, and expensive, but neat. I'm not sure if they come sufficiently hefty to run a radiator fan, and small enough to fit in a 2 x 1 x .5" metal case though. Cheers, James Arthur
Reply by ●October 3, 20152015-10-03
On Sat, 3 Oct 2015 16:10:17 -0700 (PDT), dagmargoodboat@yahoo.com wrote:>On Saturday, October 3, 2015 at 6:09:24 PM UTC-4, rickman wrote: >> On 10/3/2015 5:57 PM, Tom Miller wrote: >> > >> > "rickman" <gnuarm@gmail.com> wrote in message >> > news:muph5o$88r$2@dont-email.me... >> >> On 10/3/2015 4:58 PM, John Larkin wrote: >> >>> On Sat, 3 Oct 2015 11:09:40 -0700 (PDT), dagmargoodboat@yahoo.com >> >>> wrote: >> >>> >> >>> >> >>> PV optocouplers are cool for driving isolated gates, but maybe not >> >>> available in your junk box. >> >>> >> >>> I'm designing a kilovolt-range linear voltage regulator, and a PV is a >> >>> really easy way to drive the pass transistor gate. >> >>> >> >>> Hey, a packaged SIP dc/dc converter would make a nice SSR gate driver. >> >>> $4 or something from Mouser. >> >> >> >> That is the point of this circuit. A PV photocoupler needs a power >> >> source. This circuit *is* the power source. >> >> >> >> >> > >> > No, a PV optocoupler makes it own voltage. Just add it to the 12 volts >> > to drive the gate. >> >> Since when? They use a phototransistor, not a PV solar cell. > >The PV couplers John and Tom are talking about actually do exactly that--they >couple an LED to a solar cell array, which drives a FET.Rickman is obnoxious and generally wrong, so I ignore him. Sloman clone.> >They're slow, and expensive, but neat. I'm not sure if they come sufficiently >hefty to run a radiator fan, and small enough to fit in a 2 x 1 x .5" metal case >though.I mean the little ones, like this: http://www.digikey.com/product-detail/en/TLP191B%28TPR,U,C,F%29/TLP191BFTR-ND/871239 Really cool. They make about 8 volts, plenty to drive a mosfet gate. Yes, they will be slow when driving a lot of capacitance. We pay about $1.60 each. This is essentially what's inside small SSRs. Which can cost half that price! Vishay makes a dual, 13 volts typ output. In series, that's 26! Four make 100 volts! Must be good for something.
