Guru
Joined: 05/03/2018
Location: NetherlandsPosts: 6035
| Posted: 03:10pm 29 Aug 2022 |
Picomite does it all.....
Thanks to the phase correct PWM the pico is designing (or tuning) this transformer driver circuit. Currently with 2x 2N2222A, but will change to 2 FET's once the shipment comes in.
The picomite controls (PWM1) the load to the convertor (10mA...600mA)
The picomite drives the 2 switching transistors with phase correct PWM0
The picomite measures input (ADC) and output voltage (ADC)
The picomite measures the current through the switching transistors (ADC).
The picomite does all the math to determine the efficiency of the convertor.
Tomorrow I'll write the tuning algorithm to vary frequency, load, duty cycle, and determine the efficiency landscape (3d graph in excel from CSV data).
Then the setup moves to the climatic chamber to see how things behave at different temperatures.
Anyway, once the algorithm works, I can tune the transformer and FET's for best efficieny.
The only thing I do not have automated yet is the input voltage. Which I may do using serial port. I must have a MAX232 somewhere. The pico can then also control the power supply.
In case you wonder why the wire is so thick for 600mA: it is tripple insulated wire since the convertor must isolate input from output under 12kV surge. I will add surge protection at the switcher transistors.
Edited 2022-08-30 01:13 by Volhout