Various aspects of home brew inverters

Author	Message
poida Guru Joined: 02/02/2017 Location: Australia Posts: 1432	Posted: 03:57am 05 Nov 2018         gaspo said   Thanks Poida for the code. Loaded the 2x_sinewave_pwm into pro-mini and it worked right away. I was surprised how short the code is, almost fits whole on the screen. Nice soft start and stop of the sine wave. When I stop the sine wave generation (with button) there are still 20Khz varying length pulses (~100-500ns) running on the outputs. Is that intentional? I'm happy to see someone run it as easily I do. The 20kHz at "stop" is intentional. If you check both output's duty cycle, you will see they are the same, at about 50%, constant no matter where you look. This output would, when fed into 2 1/2 bridges, provide the same voltage at the 1/2 bridge output. Since both outputs are the same voltage, no current will flow from one output to the other. These 2 outputs (I call them V1 and V2) are connected to the transformer primary winding. No voltage difference at V1 and V2 means no current through the transformer. I seems a bit spooky but it works beautifully (in my case anyway...) wronger than a phone book full of wrong phone numbers