28 Jun 2006 Nic   » (Master)

June 25th, 2006

I did some tests on the H-bridge circuit and made several modifications. One change was to switch the NPN power driving transistors with PNP transistors which saved a couple volts. Another change was to replace the diodes from the direction input with NPN transistors. It turned out the voltage drop accross the diodes was too much to pull the bases of the transistors low. I also made the smallest amount of resistance from negative to positive in the logic part 10 kiliohms rather than 1 kiliohm to save power, which is important when using the +24V source. It's also nice to save power wherever possible on an electric vehicle, because those miliamps add up!

Go to http://www.craterfish.org/teamprodigies/?pictures?2006/Jun to see a schematic diagram of the new H- Bridge circuit!

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