Hey all,
I want to charge a battery from a three phase generator using the circuit attached.
Fast explanation:
When voltage reaches 14,4V mosfets will be closed and shunt the current back to the generator.
I want to have a fixed switch frequency so I made a simple sawtooth signal from three transistors (70Hz).
The first comparator is for comparing the 14,4V with reference voltage 2,5V from a TL431.
The second comparator is for making the PWM signal with the needed duty cycle depeding on the voltage in c3.
I build the circuit on a breadboard and it works pretty well but if I change the load the output voltage is also changing alot like 0,5V.
I want it to be less than 100mV.
Using a microcontroller would probably fix the issue but I am looking for an analog solution.
I want to charge a battery from a three phase generator using the circuit attached.
Fast explanation:
When voltage reaches 14,4V mosfets will be closed and shunt the current back to the generator.
I want to have a fixed switch frequency so I made a simple sawtooth signal from three transistors (70Hz).
The first comparator is for comparing the 14,4V with reference voltage 2,5V from a TL431.
The second comparator is for making the PWM signal with the needed duty cycle depeding on the voltage in c3.
I build the circuit on a breadboard and it works pretty well but if I change the load the output voltage is also changing alot like 0,5V.
I want it to be less than 100mV.
Using a microcontroller would probably fix the issue but I am looking for an analog solution.
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