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does addition of capacitor increase current in a circuit

Ajay P
Intellectual 310 points

Hi,

This query is regarding an observation today at our lab. When we were connecting our motor controller board using DC supply, it was working fine. But when we connected the controller using auto transformer or AC supply with bridge rectifier, our controller is getting failed. Components are getting damaged. what is the reason? Is it the increased current flow? We have already three series capacitors connected parallel. If we increase the capacitance does the current in the circuit increases? Does the voltage spike increase? We have used the capacitors for filtering purpose. Please respond with a solution.

  • 0
    TI__Guru**** 189401 points

    Hello,

    Our office is closed Monday for the US Martin Luther King, Jr holiday. We will get back with you on your question early next week.

    Best regards, Don

  • 0 in reply to Don Dapkus
    TI__Genius 11350 points

    Hi Ajay,

    There's really not enough information to try to determine what is causing your system to fail. I would guess that it's likely due to a grounding issue (related to the ground isolation between the input and output). However, if you can share the part number of the controller as well as a schematic, I can direct this to the correct product expert who can provide a more informed answer.

    Regards,

    Ray

  • 0 in reply to Ray DiCecco
    Intellectual 310 points

    Hi Ray,

    This query is regarding basic rectifier circuit. If we add capacitor at the filter section, does it impact in producing any voltage spikes ?

  • 0 in reply to Ajay P
    TI__Genius 11350 points

    Hi Ajay,

    In general, adding capacitors across the bridge would typically reduce current spikes. However, adding capacitors may introduce a non-linearity in your circuit which may introduce stability problems, but not "spikes".  

    Please note that if you connect three series capacitors in parallel with the input or output of the bridge, the capacitance is being reduced (Ctotal = 1/(1/C1 + 1/C2 + 1/C3)).

    If you provide a schematic of your circuit including the filter section, I will try to help you determine where there may be an issue.

    Regards,

    Ray