fun h bridge for winch control
in [Design]
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From: acannell on 8 Oct 2009 13:47 On Oct 8, 6:03 am, PeterD <pet...(a)hipson.net> wrote: > On Wed, 7 Oct 2009 16:00:41 -0700 (PDT), "acann...(a)wwc.com" > > > > <acann...(a)wwc.com> wrote: > >oh you guys are gonna like this one... > > >so i bought a winch for my jeep but it didnt come with a controller > >box. > > >so i need a way to connect the 12V from the jeep battery to the winch > >ON and OFF like....and reverse it...so I can reverse the winch > >direction > > >thats it! > > >needs to be controlled with a rocker switch, or two switches, whatever > > >the maximum steady-state current of the winch is about 300A, so the > >switching circuit needs to handle that > > >and of course the winch is an enormous DC motor > > >so...whats a fun way to do this? bank of mosfets? something else? > > >i know i can just by a big relay/contactor, but i want to make this > >myself... > > >suggestions? > > Go to Warn's site, and download the schematics from one of their winch > controllers, they are simple, using four 'starter relays' of the Ford > variety, a simple switch (SPDT center off), and not much else... > > Resist the urge to go solid-state... Those 'starter relays' are about > $10 each at the parts store. Yeah this is probably the best idea. But I want to go solid state just for fun. Its a neat project dont you think?
From: Joerg on 8 Oct 2009 14:32 acannell(a)wwc.com wrote: > On Oct 8, 6:24 am, George Herold <ggher...(a)gmail.com> wrote: >> On Oct 7, 7:00 pm, "acann...(a)wwc.com" <acann...(a)wwc.com> wrote: >> >> >> >>> oh you guys are gonna like this one... >>> so i bought a winch for my jeep but it didnt come with a controller >>> box. >>> so i need a way to connect the 12V from the jeep battery to the winch >>> ON and OFF like....and reverse it...so I can reverse the winch >>> direction >>> thats it! >>> needs to be controlled with a rocker switch, or two switches, whatever >>> the maximum steady-state current of the winch is about 300A, so the >>> switching circuit needs to handle that >>> and of course the winch is an enormous DC motor >>> so...whats a fun way to do this? bank of mosfets? something else? >>> i know i can just by a big relay/contactor, but i want to make this >>> myself... >>> suggestions? >> 300 amps sems like a lot! I thought the alternator only put out 60A >> or so? I guess they put bigger alternators in trucks and such. I've >> got a small winch on my truck and just use a big rocker switch. >> What's wrong with a even bigger switch? It's simple. >> >> George H. > > The battery and the alternator work together to supply the current to > the winch.. My winch only draws 30A under no load. But under full load > (8000lbs) draws 280A. > > How big of a rocker switch?? Jeez how often do you use it? Most hand > operated switches would not be able to handle winch current. Well, that depends :-) http://www.electroswitch.com/electroswitchesandrelays/images/itapSwitch.jpg You can get switches rated at 1000 amps continuous. -- Regards, Joerg http://www.analogconsultants.com/ "gmail" domain blocked because of excessive spam. Use another domain or send PM.
From: Joerg on 8 Oct 2009 14:34 acannell(a)wwc.com wrote: > On Oct 8, 6:03 am, PeterD <pet...(a)hipson.net> wrote: >> On Wed, 7 Oct 2009 16:00:41 -0700 (PDT), "acann...(a)wwc.com" >> >> >> >> <acann...(a)wwc.com> wrote: >>> oh you guys are gonna like this one... >>> so i bought a winch for my jeep but it didnt come with a controller >>> box. >>> so i need a way to connect the 12V from the jeep battery to the winch >>> ON and OFF like....and reverse it...so I can reverse the winch >>> direction >>> thats it! >>> needs to be controlled with a rocker switch, or two switches, whatever >>> the maximum steady-state current of the winch is about 300A, so the >>> switching circuit needs to handle that >>> and of course the winch is an enormous DC motor >>> so...whats a fun way to do this? bank of mosfets? something else? >>> i know i can just by a big relay/contactor, but i want to make this >>> myself... >>> suggestions? >> Go to Warn's site, and download the schematics from one of their winch >> controllers, they are simple, using four 'starter relays' of the Ford >> variety, a simple switch (SPDT center off), and not much else... >> >> Resist the urge to go solid-state... Those 'starter relays' are about >> $10 each at the parts store. > > Yeah this is probably the best idea. But I want to go solid state just > for fun. Its a neat project dont you think? Fun? I don't know. But if you implement a proper PWM you could impress your friends and tell them "Hey, I can make this huge log move at exactly 5ft per minute" :-) -- Regards, Joerg http://www.analogconsultants.com/ "gmail" domain blocked because of excessive spam. Use another domain or send PM.
From: Paul Hovnanian P.E. on 8 Oct 2009 15:11 PeterD wrote: > On Wed, 7 Oct 2009 16:00:41 -0700 (PDT), "acannell(a)wwc.com" > <acannell(a)wwc.com> wrote: > >>oh you guys are gonna like this one... >> >>so i bought a winch for my jeep but it didnt come with a controller >>box. >> >>so i need a way to connect the 12V from the jeep battery to the winch >>ON and OFF like....and reverse it...so I can reverse the winch >>direction >> >>thats it! >> >>needs to be controlled with a rocker switch, or two switches, whatever >> >>the maximum steady-state current of the winch is about 300A, so the >>switching circuit needs to handle that >> >>and of course the winch is an enormous DC motor >> >>so...whats a fun way to do this? bank of mosfets? something else? >> >>i know i can just by a big relay/contactor, but i want to make this >>myself... >> >>suggestions? >> >> > > Go to Warn's site, and download the schematics from one of their winch > controllers, they are simple, using four 'starter relays' of the Ford > variety, a simple switch (SPDT center off), and not much else... > > Resist the urge to go solid-state... Those 'starter relays' are about > $10 each at the parts store. Resist the urge to use starter relays. They're not rated for continuous duty like the OEM equipment is. -- Paul Hovnanian paul(a)hovnanian.com ---------------------------------------------------------------------- Have gnu, will travel.
From: George Herold on 8 Oct 2009 15:51
On Oct 8, 1:46 pm, "acann...(a)wwc.com" <acann...(a)wwc.com> wrote: > On Oct 8, 6:24 am, George Herold <ggher...(a)gmail.com> wrote: > > > > > > > On Oct 7, 7:00 pm, "acann...(a)wwc.com" <acann...(a)wwc.com> wrote: > > > > oh you guys are gonna like this one... > > > > so i bought a winch for my jeep but it didnt come with a controller > > > box. > > > > so i need a way to connect the 12V from the jeep battery to the winch > > > ON and OFF like....and reverse it...so I can reverse the winch > > > direction > > > > thats it! > > > > needs to be controlled with a rocker switch, or two switches, whatever > > > > the maximum steady-state current of the winch is about 300A, so the > > > switching circuit needs to handle that > > > > and of course the winch is an enormous DC motor > > > > so...whats a fun way to do this? bank of mosfets? something else? > > > > i know i can just by a big relay/contactor, but i want to make this > > > myself... > > > > suggestions? > > > 300 amps sems like a lot! I thought the alternator only put out 60A > > or so? I guess they put bigger alternators in trucks and such. I've > > got a small winch on my truck and just use a big rocker switch. > > What's wrong with a even bigger switch? It's simple. > > > George H. > > The battery and the alternator work together to supply the current to > the winch.. My winch only draws 30A under no load. But under full load > (8000lbs) draws 280A. > > How big of a rocker switch?? Jeez how often do you use it? Most hand > operated switches would not be able to handle winch current.- Hide quoted text - > > - Show quoted text - Oh I've got a small winch. I think 60 A max. (I use it to raise and lower the snow plow on the front of the truck.... Speaking of which I should check that it's all still working. Not long till the snow starts to fly.) George H. |