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Hello, I was wondering what the rough guidelines are for selecting parallel capacitors for battering or DC power supply designs. What would be a good capacitor, for example, to put in parallel with a 35V DC source that is powering some inversion circuitry? What should I look at when picking this capacitor?
And got the following answer:
The 35V DC source probably already has enough filter capacitance in parallel with it`s output to take care of any low frequency fluctuations in the DC. The power supply filter will shunt out unwanted higher frequencies also if the impedance is not too high between where the higher frequencies originate and the power supply filter. You will only have to be concerned with unwanted frequencies that originate in the inversion circuitry. The size of the capacitor used for shunting unwanted frequencies depends on the frequency of the unwanted signal. First determine if you even have a problem with unwanted signals present in the output of the inversion circuitry. If you do have unwanted signals present then use an oscilloscope to find the origin and frequency of the unwanted signal. From that you can determine what capacitance value and Voltage rating the capacitor should have and where in the circuit it should be installed. If the unwanted signal frequency is close to the desired frequency then a frequency selective trap may be required because a shunt capacitor that is effective at the unwanted frequency would also attenuate the desired frequencies.