H-Bridge Circuit

Kye

Thanks for all the help guys that you've been giving on my line following robot.
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So, I've finalized a lot of the parts of my robot and I just wanted an opinion of the·attached circuit.
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I think everything's good in the circuit except for·the inductors that are attached to the H-bridge (L298). I read somewhere online once that if I were to use a inductor in series with an H-bridge's GND or VCC (for Motor) pins that the inductor would keep the current constant in the circuit. However, I can't simply blindly include them because the PIC microcontroller (http://www.pololu.com/catalog/product/210) is going to be applying a 600Hz PWM frequency to the H-bridge... so the inductor might build up a considerable impendence at that frequency.
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I'm just being to learn this stuff right now in college and I'm kind of new to actually understanding exactly how analog circuits work.
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Should I nix the inductors or keep them?

---The current sensing outputs on the bottom are at the bottom of the H-Bridge are included so you can atttach a series resistor to sense the voltage across the resistor and then calculate the current through the resistor and thus the motor. I'e put inductors there instead.

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Nyamekye

Post Edited (Kye) : 9/25/2008 5:01:11 PM GMT

Franklin

Add a subject line.

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- Stephen

Chris Savage

You can use the pencil icon to the top-right of the message to edit it. It almost looks as if you have a thread on this subject already though. Should this not be followed up there?

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Chris Savage
Parallax Engineering

Kye

Well, I tested this circuit and it seems solid. The inductor can easily be bypassed anyway so i'll leave it in the circuit. It may, however, allow me to measure current across the motor without adversely affecting the resistance. So... it's good.

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Nyamekye