Hi friends,
I am working on a project solar charge controller using MPT612.
PWM frequency is 20khz.
I am facing problem with battery current measurement.
A resistor is connected in series with battery negative and drop across the resistor is taken for measuring current. This differential signal is connected to OP-AMP for amplification.
i have observed the NOISE on the OP_AMP input, same is amplified and hence i am not able to get correct measurement.
voltage spikes with pk-pk 230mv @ 30%PWM @ 20khz are observed.These spikes are increasing with increasing the Pulse width(i.e. 800mv @ 40%).
can somebody tell me how can i eliminate these voltage spikes, noise.
do i need to tune snubber circuit of the MOSFET?
I have attached the schematic of the BUCK-BOOST Converter.
Thanks and Regards,
Viswanath