| Author |
Message |
gameelgamal
Joined: 14 Dec 2006
Posts: 76
Location: Egypt
|
 31 Dec 2006 0:11 Question about H-Bridge |
|
|
|
|
I have a 1A DC motor and I want to control its speed and direction using H-Bridge
so, Which kind of transistor is more suitable?? MOSFET or BJT ?? and why??
Another thing, I will use amicrontroller in this circuit.
So, if the microcontroller cant drive the transistor, Is there an IC that can work like an agent between the controller and the transistor, I mean it takes IPs from controller and give O/Ps to the transistor
|
|
| Back to top |
|
 |
IanP
Joined: 05 Oct 2004
Posts: 6361
Helped: 1509
Location: West Coast
|
|
| Back to top |
|
|
gameelgamal
Joined: 14 Dec 2006
Posts: 76
Location: Egypt
|
| 01 Jan 2007 2:43 Re: Question about H-Bridge |
|
|
|
|
look to this IC please
I have buy this IC, but it works verybad, I dont know why
Do you know another one that can do the same work (as a MOSFET driver)
and thank you
|
|
| Back to top |
|
|
IanP
Joined: 05 Oct 2004
Posts: 6361
Helped: 1509
Location: West Coast
|
| 01 Jan 2007 4:56 Re: Question about H-Bridge |
|
|
|
|
Instead of trying to find another H-Bridge driver IC, and there are not many similar ICs on the market, let's find out what's gone wrong with the HP4081 ..
What configuration do you use and how do you control this driver?
Regards,
IanP
|
|
| Back to top |
|
|
gameelgamal
Joined: 14 Dec 2006
Posts: 76
Location: Egypt
|
| 01 Jan 2007 13:50 Re: Question about H-Bridge |
|
|
|
|
I downloaded the diagram into 2 pictures
|
|
| Back to top |
|
|
gameelgamal
Joined: 14 Dec 2006
Posts: 76
Location: Egypt
|
| 01 Jan 2007 13:51 Re: Question about H-Bridge |
|
|
|
|
the 2nd one
As you can see, He uses 8 transistors to double the ampere rate of the circuit.
But I used 4 MOSFET only
|
|
| Back to top |
|
|
gameelgamal
Joined: 14 Dec 2006
Posts: 76
Location: Egypt
|
| 01 Jan 2007 14:15 Re: Question about H-Bridge |
|
|
|
|
I controled this IC using AT89C52 microcontroller (8051 family)
I used asmall motor to test the circuit (from a toy)
when I tested the cicuit, One of the transistors get hot too much
another thing, my friend bought another hip4081 and it doesnt work too
but he didnt give up, He bought hip4082 (it differs alittle from hip4081) but it doesnt work too
so I need another IC to use
thank you
|
|
| Back to top |
|
|
yogi
Joined: 08 Jan 2005
Posts: 344
Helped: 17
|
| 12 Jan 2007 10:09 Question about H-Bridge |
|
|
|
|
better use mosfet for fast switching and you will get current rating upto 4A with IRF series. See these things while designing H-bridge
http://booksbybibin.14.forumer.com/viewtopic.php?t=130
Bibin John
www.bibinjohn.tk
|
|
| Back to top |
|
|
Js_Ong
Joined: 15 Jan 2007
Posts: 32
Helped: 2
|
| 18 Jan 2007 4:40 Re: Question about H-Bridge |
|
|
|
|
| HI, have you checked out the data sheet of your transistor? or it maight be heatsinked? u need make your own H-bridge? If this is not a reqiurement, y dont you just try this L293D, it can produce you up to 36V, 1A, due to the power disipation, a simple iron or zinc plate stamp together with the IC to enlarge the area for heat disposal. And u can use your Atmel controller to control the enable pin at the IC, u can make it bidirectional. One IC can control two bidirectional motors.
|
|
| Back to top |
|
|
Mr.Cool
Joined: 20 Jun 2001
Posts: 531
Helped: 16
|
| 26 Jan 2007 22:34 Question about H-Bridge |
|
|
|
|
mosfets are a better choice because they come with the free-wheeling diode for free. the BJT you must add this seperately. also, it is simple to drive MOSFET.
i see on your schematic B_HS is labeled, but since i don't see an off-page connector i wonder if it is connected to your microcontroller?
make sure you're using the disable pin properly.
also there is an associated application note that may give you more hints.
Mr.Cool
|
|
| Back to top |
|
|
serene_divine
Joined: 07 Feb 2007
Posts: 5
|
| 07 Feb 2007 12:00 Re: Question about H-Bridge |
|
|
|
|
| use L293d IC which can drive two DC Motors. it has four mosfets internally which can be used as switches and can be controlled from micro-controller...
|
|
| Back to top |
|
|
