jit_singh_tara
Full Member level 6
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Dear friends ,
I have come up with a problem ...... when i drive the ac motor with contactors by manually pushing the coil tab , The motor runs and i c a lot of noise being generated on the ac power line (it reflects on a power supply of 7805 5Volts , though i have used capacitors across its output ,10uF, 1uF, .1uF etc.
The contactors are driving the ac motor .....as soon as it makes contact ....there is spike in the main microcontroller pcb card power supply.....
even if i disconnect the pcb ....the noise is seen on the 5V dc line , and its quite big around 20 - 30V sometime.....
Please suggest how to make a ripple free power supply in case of an application which is driving ac motor with contactors....
Thanks a lot........
I have come up with a problem ...... when i drive the ac motor with contactors by manually pushing the coil tab , The motor runs and i c a lot of noise being generated on the ac power line (it reflects on a power supply of 7805 5Volts , though i have used capacitors across its output ,10uF, 1uF, .1uF etc.
The contactors are driving the ac motor .....as soon as it makes contact ....there is spike in the main microcontroller pcb card power supply.....
even if i disconnect the pcb ....the noise is seen on the 5V dc line , and its quite big around 20 - 30V sometime.....
Please suggest how to make a ripple free power supply in case of an application which is driving ac motor with contactors....
Thanks a lot........