Which H-Bridge?

I have a RoboteQ AX2550 controller.

's a "plug and *play*" device.

It can surely handle regenerative braking. My robot is a based on an electric wheelchair and if I move it much when the power has been disconnected, the controller lights up due to the current from the motors. (There's a warning in the manual about that. I try to avoid it.) Also, the braking curve can be set in software so there are lots of possibilities.

2 amps at 15V is at the very low end of the AX2550's capabilities but it's a handy unit that you could always put to work on something larger someday.

--kyler

I don't remember braking and reverse working at the same time. If you have braking you lose the reverse feature.

has a nice moto controller that is good up to 5 amps. You need two of them. if you want to go that route. I think sells these too.

If you really want the braking feature you'll probably need to use RC Electronic speed controls like those sold via

or or or

is your friend. try a search for "serial motorcontroller hbridge".

I went through the process of looking for an H-Bridge a couple of weeks ago. Places you might want to check out include Acroname

(look under their "Drivers" section and also New Micros I have purchased stuff from both these companies and been pleased with their service.

In my case, I went with the New Micro's NIMH-0010-LED board which is based on the SN754410 chip. The chip itself is the H-Bridge, but the board provides a convenient way of dealing with the chip. The NIMH-0010 comes in two flavors, plain and with LED's coupled to the inputs to show logic. Now when I bought the thing, I went with the LED option which I thought would be useful in debugging. But it turned out that my cheap little Radio Shack multimeter was way more useful that the LED's. Or so I thought. I was using the board as part of a simple project to show a capability to use a microcontroller (Atmel AVR, a great MCU!) to run a biploar stepper motor. Well, when I showed the thing, everyone thought that the best part of the demo was the blinking LEDs!

So the NIMH is a handy little board, and the New Micro's folks were very nice to me when I had technical questions, and all would have gone well except that the other night I was playing with the thing and managed to fry it... I guess the SN754410 just didn't like the idea of me hooking up the supply voltage to one of the logic lines. So now I've got to replace the chip.

Gary

P.S. Many H-Bridges have a "brake" state though regenerative braking is an entirely different matter.

You may find this link helpful:

--Chuck

Chuck,

Thanks for the great page! It is just what I was looking for. Of course anytime somebody does something good, somebody else asks for something more... so, any chance we'll be seeing the pages on FET based designs in the near future [grin]?

Seriously, pages like yours are what makes the web worthwhile.

Gary

I'll give you some plans and schematic diagram for $2.00 This design of mine can handle high current, and not difficult to build yourself.

email me: