29 Jun 2006 Nic   » (Master)

June 28th, 2006

I soldered the H-Bridge circuit that I designed. I noticed a major flaw in the circuit design - I had it so that either the left MOSFETs were both on or the right MOSFETs were both on which would short out the circuit and melt stuff. Fortunately I noticed this before I soldered the circuit. The new diagram is at http://www.craterfish.org/teamprodigies?pictures?2006/Jun, along with pictures of the finished motor controller. The heatsinks are set up in such a way that the entire circuit board will go inside a tube that will have air flowing through this. I may put a fan in, or I may just have an air intake on the front of the vehicle.

The motor controller is user-proof. It has two wires for the motor, a ground wire, +12V, +24V, a direction input, high control, and low control. The high and low control wires turn the power on or off to the high-side and low- side MOSFETs. The low-side power can be controlled with PWM. The high-side MOSFETs would be turned off for regenerative breaking, while the low-side remained on with PWM.

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