High power h-bridge - Electronic Circuits Projects Diagrams Free

dreed75 · 6th August 2004, 04:46 PM

I need to make an H-Bridge that will be used basically as a heavy duty servo which is hooked to my microcontroller. It needs to be able to drive a motor that is about 20A @ 12V (wiper motor). I have searched for days on how to build one but I can't find one that is over 2A. I will probably have to make my own so I need some help.

I found this page to be very helpful
http://www.dprg.org/tutorials/1998-04a/
but I can't find any PNP MOSFETS that are equal to a NPN MOSFET that I find.

Does anybody know of a PNP, NPN combo that will work for me?

Thanks

falleafd · 6th August 2004, 06:03 PM

Try with IR630. I dont remember which it is, but you can search for its application notes. It may drive upto 50A motors.

dreed75 · 6th August 2004, 06:20 PM

I searched for that chip on findchips.com but it wasn't found. Also on Yahoo, there was no matches.

motion · 8th August 2004, 01:25 AM

The correct part number is IRF630N. Here's the link.

http://ec.irf.com/v6/en/US/adirect/i...ductID=IRF630N

You should also consider a lower voltage (100V) but higher current rated device (23A), the IRF540N.

http://ec.irf.com/v6/en/US/adirect/i...ductID=IRF540N

also

http://ec.irf.com/v6/en/US/adirect/ir?cmd=advFrame

International Rectifier also has half-bridge MOSFET drivers to go with these devices.

varkeychaya · 15th August 2004, 12:31 PM

i don't know if it will serve your purpose but you could check out the hbridge at the site Robot room, you'll get resources for other circuits as well

pkshima · 20th August 2004, 09:44 AM

I guess for that high amperage you should use a relay based H-Bridge and have controll of it with ULN2003.

crust · 20th August 2004, 05:14 PM

No, I would not use relays. I would do as suggested and use some very high current (read low RDSon) discrete mosfets. Building an h-bridge is very straightforward. I would pick the lowest voltage you are comfortable with and then find one with sufficient current handling.

Oznog · 23rd August 2004, 08:12 PM

"npn" and "pnp" is a term for bipolar. MOSFETs are called n-channel and p-channel, or PMOS/NMOS.

You would want to hook your two PWM channels to the n-channels pulling the outputs to ground. The p-channel is at 12V so the gate can't be switched directly, you will use a small MOSFET or npn to pull down the gate and a pullup pulls it back up.

PMOS is inherently lower gain and higher rds than NMOS. Not that you can't find PMOS with a lower rds than an NMOS, but in the end the biggest one PMOS you're going to find is worse than the NMOS, at least for a particular price. Go to http://www.digikey.com Seach for MOSFET, select p-channel, click "Apply Filters", then select the current you want AND, using the shift key, select every current higher than what you want.

crust · 23rd August 2004, 11:09 PM

You can also build a purely NMOS h-bridge. That reduces the number of different components and for equivalent RDSon values, N channel parts are lower cost and more readily available. All of mine are NMOS only. The trick is to use a small voltage doubler circuit to raise the gate voltage to 2Vcc so that the n-channel parts at the top of the bridge turn on. You have to be running high enough voltage so that the gate is 4 to 7 or more volts beyond the voltage at the drain node. For instance, with a 12V motor, you would generate 24V which is enough for the mosfets to work. You can use any of the ICL7660 doubler circuits. Alternatively, there are special parts such as the HIP4081 (i might be wrong about the part number) that is specifically designed to interface directly to an all n-channel h-bridge.

stephenvb · 3rd June 2009, 12:13 AM

I have standardized on the IR331* for the high side of h-bridges. These parts have an adjustable current limit, up to 90 Amps. The current limit is set with a single resistor. The output current is proportional to the current limit voltage so the current can be measured with a simple ADC. They are on when the input is off so they can be driven with a small mosfet directly from a microprocessor. The current limit makes the whole h-bridge very robust. I have used it with wiper motors and larger motors. By monitoring the bridge current I can operate motors until they stall, avoiding the need for limit switches and circuitry. The overcurrent response is fast.

These work well with motors but the overcurrent response is so fast that they won't drive headlights, which have over 10:1 in rush (2 60w bulbs have over 100A in rush cold).

If you want more info you can e-mail me at stephen@copper.net - I probably won't check this site very often. If you want a couple of surface mount IR 3312 (30A) or IR3310 (100A) I could sent them to you. This offer is only good for a few people.

- Stephenvb

shimniok · 9th June 2009, 10:56 PM

Quote:

Originally Posted by crust

YAll of mine are NMOS only. The trick is to use a small voltage doubler circuit to raise the gate voltage to 2Vcc so that the n-channel parts at the top of the bridge turn on. You have to be running high enough voltage so that the gate is 4 to 7 or more volts beyond the voltage at the drain node. For instance, with a 12V motor, you would generate 24V which is enough for the mosfets to work. You can use any of the ICL7660 doubler circuits. Alternatively, there are special parts such as the HIP4081 (i might be wrong about the part number) that is specifically designed to interface directly to an all n-channel h-bridge.

Not to hijack but -- thanks for posting this. The lightbulb just went on for me on this topic.

birdman0_o · 9th June 2009, 11:26 PM

Quote:

Originally Posted by crust

For instance, with a 12V motor, you would generate 24V which is enough for the mosfets to work. .

Many mosfets have a max Vgs of 20V and going over this will fry them, check the datasheet

stephenvb · 10th June 2009, 12:44 AM

Yes, you can make a vltage doubler and use all n-mos. I use the IR331* and suggest it because you don't need a voltage doubler and because it provides short circuit protection. At such high currents shoot-through, a wiring error or a short destroys the mosfets, connectors and circuit boards. In an h-bridge high side protection also protects the low side mosfets. I make mistakes and I have had wires come loose and motors fail so this is important to me. If you never have these things happen it would be of no use at all.

rikilshah · 12th June 2009, 11:29 AM

Use IRF 840 and IRF 9520 combo for Hbridge motor drive...
They are working great for me....
Stay away from Relays young man!!!!

be80be · 12th June 2009, 09:28 PM

Here is all you need two of them make a full H-bridge

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6th August 2004, 04:46 PM	#1
dreed75	High power h-bridge I need to make an H-Bridge that will be used basically as a heavy duty servo which is hooked to my microcontroller. It needs to be able to drive a motor that is about 20A @ 12V (wiper motor). I have searched for days on how to build one but I can't find one that is over 2A. I will probably have to make my own so I need some help. I found this page to be very helpful http://www.dprg.org/tutorials/1998-04a/ but I can't find any PNP MOSFETS that are equal to a NPN MOSFET that I find. Does anybody know of a PNP, NPN combo that will work for me? Thanks

6th August 2004, 06:03 PM	#2
falleafd	Try with IR630. I dont remember which it is, but you can search for its application notes. It may drive upto 50A motors. __________________ Falleaf mail@falleaf.net English forums at PIC Vietnam - Vietnamese Electronics forums R&P Trading and Forwarding Co. Ltd. Distributor of Microchip in Vietnam

6th August 2004, 06:20 PM	#3
dreed75	I searched for that chip on findchips.com but it wasn't found. Also on Yahoo, there was no matches.

8th August 2004, 01:25 AM	#4
motion	The correct part number is IRF630N. Here's the link. http://ec.irf.com/v6/en/US/adirect/i...ductID=IRF630N You should also consider a lower voltage (100V) but higher current rated device (23A), the IRF540N. http://ec.irf.com/v6/en/US/adirect/i...ductID=IRF540N also http://ec.irf.com/v6/en/US/adirect/ir?cmd=advFrame International Rectifier also has half-bridge MOSFET drivers to go with these devices. __________________ "Having to do with Motion Control"

15th August 2004, 12:31 PM	#5
varkeychaya	Hbridge i don't know if it will serve your purpose but you could check out the hbridge at the site Robot room, you'll get resources for other circuits as well __________________ god knows and time will tell :-) - varky

20th August 2004, 09:44 AM	#6
pkshima	I guess for that high amperage you should use a relay based H-Bridge and have controll of it with ULN2003. __________________ Its not the Practice that makes a man perfect. Its the Man who makes the practice perfect ----- Pradeep K. Shima -----

20th August 2004, 05:14 PM	#7
crust	No, I would not use relays. I would do as suggested and use some very high current (read low RDSon) discrete mosfets. Building an h-bridge is very straightforward. I would pick the lowest voltage you are comfortable with and then find one with sufficient current handling.

23rd August 2004, 08:12 PM	#8
Oznog	"npn" and "pnp" is a term for bipolar. MOSFETs are called n-channel and p-channel, or PMOS/NMOS. You would want to hook your two PWM channels to the n-channels pulling the outputs to ground. The p-channel is at 12V so the gate can't be switched directly, you will use a small MOSFET or npn to pull down the gate and a pullup pulls it back up. PMOS is inherently lower gain and higher rds than NMOS. Not that you can't find PMOS with a lower rds than an NMOS, but in the end the biggest one PMOS you're going to find is worse than the NMOS, at least for a particular price. Go to http://www.digikey.com Seach for MOSFET, select p-channel, click "Apply Filters", then select the current you want AND, using the shift key, select every current higher than what you want.

23rd August 2004, 11:09 PM	#9
crust	You can also build a purely NMOS h-bridge. That reduces the number of different components and for equivalent RDSon values, N channel parts are lower cost and more readily available. All of mine are NMOS only. The trick is to use a small voltage doubler circuit to raise the gate voltage to 2Vcc so that the n-channel parts at the top of the bridge turn on. You have to be running high enough voltage so that the gate is 4 to 7 or more volts beyond the voltage at the drain node. For instance, with a 12V motor, you would generate 24V which is enough for the mosfets to work. You can use any of the ICL7660 doubler circuits. Alternatively, there are special parts such as the HIP4081 (i might be wrong about the part number) that is specifically designed to interface directly to an all n-channel h-bridge.

3rd June 2009, 12:13 AM	#10
stephenvb	simple h-bridge solution I have standardized on the IR331* for the high side of h-bridges. These parts have an adjustable current limit, up to 90 Amps. The current limit is set with a single resistor. The output current is proportional to the current limit voltage so the current can be measured with a simple ADC. They are on when the input is off so they can be driven with a small mosfet directly from a microprocessor. The current limit makes the whole h-bridge very robust. I have used it with wiper motors and larger motors. By monitoring the bridge current I can operate motors until they stall, avoiding the need for limit switches and circuitry. The overcurrent response is fast. These work well with motors but the overcurrent response is so fast that they won't drive headlights, which have over 10:1 in rush (2 60w bulbs have over 100A in rush cold). If you want more info you can e-mail me at stephen@copper.net - I probably won't check this site very often. If you want a couple of surface mount IR 3312 (30A) or IR3310 (100A) I could sent them to you. This offer is only good for a few people. - Stephenvb

10th June 2009, 12:44 AM	#13
stephenvb	h-bridge Yes, you can make a vltage doubler and use all n-mos. I use the IR331* and suggest it because you don't need a voltage doubler and because it provides short circuit protection. At such high currents shoot-through, a wiring error or a short destroys the mosfets, connectors and circuit boards. In an h-bridge high side protection also protects the low side mosfets. I make mistakes and I have had wires come loose and motors fail so this is important to me. If you never have these things happen it would be of no use at all.

12th June 2009, 11:29 AM	#14
rikilshah	Use IRF 840 and IRF 9520 combo for Hbridge motor drive... They are working great for me.... Stay away from Relays young man!!!! __________________ No one Dies Virgin,Because In the End Life F***s Everyone Rikil Shah B.Tech-2nd year, Electronics Engineering Sardar Vallabhbhai National Institute Of Technology, India. Currently working on ARM,AVR,PIC My Official Blog:-www.rikil-svnit.co.nr

12th June 2009, 09:28 PM	#15
be80be	Here is all you need two of them make a full H-bridge __________________ Burt http://mybe80be.com http://stores.shop.ebay.com/mybe80be__W0QQ_armrsZ1