On 11/28/2014 09:29 AM, Kirk Wallace wrote: > Here is the start of my notes on playing with PWM and FETS. > > http://www.wallacecompany.com/machine_shop/LinuxCNC/pwm_fet/pwm_fet.html >
I posted my second circuit at the link above. JK, I used your comment about using the gate resistor to adjust the gate speed. A small spike can be seen on the rising edge of the gate voltage, so I replaced the 22 Ohm resistor with a 68 Ohm and the rising edge now has a nice square corner. On the current sense trace, there seems to be a spike and ringing decay at the on and off events. The gain on that channel is turned up pretty high so I don't think the spike is large, but I could be wrong. The ramp will rise up just out of view at about 5 Amps average on the motor supply meter. I have to use a rag on the pulley when I try to load the motor and I can only slow it down a bit. -- Kirk Wallace http://www.wallacecompany.com/machine_shop/ http://www.wallacecompany.com/E45/ ------------------------------------------------------------------------------ Download BIRT iHub F-Type - The Free Enterprise-Grade BIRT Server from Actuate! Instantly Supercharge Your Business Reports and Dashboards with Interactivity, Sharing, Native Excel Exports, App Integration & more Get technology previously reserved for billion-dollar corporations, FREE http://pubads.g.doubleclick.net/gampad/clk?id=157005751&iu=/4140/ostg.clktrk _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
