Continue to Site

Welcome to EDAboard.com

Welcome to our site! EDAboard.com is an international Electronics Discussion Forum focused on EDA software, circuits, schematics, books, theory, papers, asic, pld, 8051, DSP, Network, RF, Analog Design, PCB, Service Manuals... and a whole lot more! To participate you need to register. Registration is free. Click here to register now.

Register Log in

Question about H-Bridge

Status
Not open for further replies.
G

gameelgamal

Member level 5
Joined
Dec 14, 2006
Messages
85
Helped
0
Reputation
0
Reaction score
0
Trophy points
1,286
Location
Egypt
Activity points
1,888
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
 

Both (MOSFET and BJT) are suitable ..

Have a look at this example:
**broken link removed**

I guess this can be a very good starting point ..

Regards,
IanP
 
Last edited by a moderator:
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
 

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
 

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
 

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
 

better use mosfet for fast switching and you will get current rating upto 4A with IRF series. See these things while designing H-bridge
**broken link removed**

Bibin John
**broken link removed**
 
Last edited by a moderator:

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.
 

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
 

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...
 

Status
Not open for further replies.

Similar threads

Part and Inventory Search

Welcome to EDABoard.com

Sponsor

Back
Top