Hi everyone,
I saw one time in this forum that someone suggest to put a capacitor in parallel with the DC motor which is driven by H-bridges to remove EMI. I am working on the exact same circuit right now, 12V DC motor, ~1A current consumption, MOSFET h-bridge, 25KHz PWM, ~40% duty cycle. When I put 0.1uF cap, the motor stopped turning. Without the cap, everything looks fine.
I have few knowledge about EMI. Could anyone explain in more detail about the function of the cap and EMI? How to choose the cap, capacitance, type?
Thanks a lot.
I saw one time in this forum that someone suggest to put a capacitor in parallel with the DC motor which is driven by H-bridges to remove EMI. I am working on the exact same circuit right now, 12V DC motor, ~1A current consumption, MOSFET h-bridge, 25KHz PWM, ~40% duty cycle. When I put 0.1uF cap, the motor stopped turning. Without the cap, everything looks fine.
I have few knowledge about EMI. Could anyone explain in more detail about the function of the cap and EMI? How to choose the cap, capacitance, type?
Thanks a lot.