Motor turned too much (H-bridge related) - Page 2 - Electronic Circuits Projects Diagrams Free

menirva · 20th March 2008, 02:44 AM

I build two h-bridge, both share the same voltage source (6VDC). Result is, the current output to drive a motor (one motor for each h-bridge) is so small.

Can someone give me some idea, how to drive two motor, without using so much voltage source? 1 voltage source for driving 1 motor, not really good in my opinion.

audioguru · 22nd March 2008, 01:29 AM

Is your supply voltage for the h-bridge only 5V?
Then if you use 2A darlington transistors like the TIP110 and TIP115, the motor will receive no voltage when the darlingtons have their max allowed saturation voltage loss. But then the motor wouldn't use any current so the saturation voltage loss will be less than 5V but might be as high as 3V so the motor gets only 2V.

menirva · 19th April 2008, 10:13 AM

Quote:

Originally Posted by KMoffett

If your Stop time can be equal to your Forward and Reverse times, then maybe you can use an 8-bit walking ring counter with OR'ed outputs.

Ken

What best to describe this circuit? A "what" circuit? What name best fit it?

**Nigel Goodwin** · 19th April 2008, 10:25 AM

Quote:

Originally Posted by menirva

I build two h-bridge, both share the same voltage source (6VDC). Result is, the current output to drive a motor (one motor for each h-bridge) is so small.

Can someone give me some idea, how to drive two motor, without using so much voltage source? 1 voltage source for driving 1 motor, not really good in my opinion.

Sounds like your supply voltage is too low, use relays instead of transistors, you can't PWM but you get pretty well zero voltage loss to the motor.

Or use a DPDT relay for reversing, and a single transistor (or FET) for PWM.

audioguru · 19th April 2008, 02:56 PM

Even if TIP110 and TIP115 complimentary darlington transistors are used to drive the motor with up to 2A from a 6V supply, their saturation voltage will reduce the voltage of the motor to from 1V to 4V.

22nd March 2008, 01:29 AM	(permalink)
audioguru Experienced Member	Is your supply voltage for the h-bridge only 5V? Then if you use 2A darlington transistors like the TIP110 and TIP115, the motor will receive no voltage when the darlingtons have their max allowed saturation voltage loss. But then the motor wouldn't use any current so the saturation voltage loss will be less than 5V but might be as high as 3V so the motor gets only 2V. __________________ Uncle $crooge

19th April 2008, 02:56 PM	(permalink)
audioguru Experienced Member	Even if TIP110 and TIP115 complimentary darlington transistors are used to drive the motor with up to 2A from a 6V supply, their saturation voltage will reduce the voltage of the motor to from 1V to 4V. __________________ Uncle $crooge

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20th March 2008, 02:44 AM	(permalink)
menirva New Member	I build two h-bridge, both share the same voltage source (6VDC). Result is, the current output to drive a motor (one motor for each h-bridge) is so small. Can someone give me some idea, how to drive two motor, without using so much voltage source? 1 voltage source for driving 1 motor, not really good in my opinion.