| ??? 10/18/04 20:16 Read: times |
#79541 - RE: driving power mosfet, gnd potential Responding to: ???'s previous message |
Abdul Rauf Jangda wrote:
------------------------------- I think you misunderstood the power supply diagram. The rail of -V is not connected with AC mains. This is isolated from each other. How ? Is the 160 V AC from a transformer ? Yes, you are right that I would need a flywheel diode on the Field winding I will do it. The surity of not turning ON the arm before field is powered, it is accomplished by software. I'd use fieldcurrent to hold a relay that energises the field personally, especially on a powerful drive like this. But my immediate problem is driving the power MOSFET even to drive a 100W light bulb. What gate modulation are you seeing ? Steve |
