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My circuit actually uses a 16F876 to monitor 3 Microchip temperature sensors within the refrigerator and along with monitoring the supply DC voltage, displays them on a LCD. This PIC also sends an On/Off control to a 8 pin PIC (12F620 i believe) which generates the 60Hz switching to the...
I should be able to apply the 20Khz PWM through a FET in the center tap of the winding and switch the 60Hz through the FET on each winding to ground then.
I should be able to simplify the circuitry since there is only one load, I don't need to monitor for current overload or load sense startup...
@t,
Is this circuit using pwm at the power line frequencies? (50/60hz). I was trying to use a PIC with a 20Mhz clock to make the PWM in software timing loops but I was not successful. It is a tapped winding so I have 2 logic level FETS driving the transformer alternately. Do I need to have a...
Wow, I am very happy to find this!!
I have been trying to make a replacement inverter for my old motorhome refrigerator for several years. The refrigerator has a compressor that works on 28Vac 60hz. It has a transformer to reduce 120Vac to 28Vac, and it also has a winding operated through a...
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