signalflow
Newbie level 5
Anyone know the best most effective way to filter out contactor noise and AC motor noise on board? The noise is coming in through at least 2 ways: 1) through the step-down transformer that powers the circuit and 2) through the relays driving the AC motors, etc.
I am powering 240V contactors and AC motors and using the same 240V lines through a step-down transformer and simple switcher power supply to power 5V and 3.3V chips.
The problem is that I get a lot of electrical noise in the system when the contactors turn on or off and when the AC motors turn on/off.
I am running the stepped-down power lines through a common-mode choke. I also have bidirectional TVS diodes across the stepped down voltage and from 5V to gnd and 3.3V to gnd...but still getting noise problems.
Thanks for any help.
I am powering 240V contactors and AC motors and using the same 240V lines through a step-down transformer and simple switcher power supply to power 5V and 3.3V chips.
The problem is that I get a lot of electrical noise in the system when the contactors turn on or off and when the AC motors turn on/off.
I am running the stepped-down power lines through a common-mode choke. I also have bidirectional TVS diodes across the stepped down voltage and from 5V to gnd and 3.3V to gnd...but still getting noise problems.
Thanks for any help.
