Various aspects of home brew inverters

Author	Message
gaspo Regular Member Joined: 25/06/2018 Location: Australia Posts: 65	Posted: 04:04pm 06 Nov 2018         poida said   Gaspo: I'm not sure how you are getting these signals. Just to make sure we are both on the same page we need to be both using the same type of Arduino and looking at the same pin's outputs. Poida, yes the pro-mini is using the same 328P chip as Uno. I have Uno as well and the code behaves the same. By looking at the code in uno_inverter_2x_sinewave_pwm.ino it seems that what I observe on pins 9/10 in stop mode is correct. When you stop inverter it decrements sst to zero while gradually reducing the pwr factor to a minimum value of 0.01. When sst == 0 the code clears pin PD5 (driving /SD on IR2184 low?). The TIMER1_OVF ISR keeps running trying to produce SPWM duty using the minimum power 0.01 (vpwr). Because calculated duty written to OCR1A/B is not zero I see very narrow 100-600ns pulses. But that does not matter if the IR2184 is disabled when stopped. I like your inverter code, how simple and stable it is while utilising the PID and the LP filter on analog pins.