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Its a very difficult subject to which most of my fellow designers estimate the ripple current in the caps and then select capacitors that can handle that current. The idea of voltage droop om most DC links can be forgotten because of other compensators such as a lower BEMF motor. The problem is to get as much life out of the caps as you can and that's to keep them cool as you can. Assume that every amp delivered from the DC like is an amp of ripple current and you should be OK.
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Does a capacitor block ac current dc current or both?
No you can't use DC capacitors in Ac because in DC current , the current flows directly while in AC current, the current flows curved zig-zag. Thus Dc equipment can't mingle with AC as they need Direct flow. So DC capacitors can't be used for AC current...................AnswerMost capacitors will operate on either DC or AC. The exception is the polarised-type capacitor, which is designed to operate with a DC or an appropriately-biased supply.Often, a capacitor's rated voltages is specified in terms of DC -for example, '100 V (DC)', so care must be exercised if it is to be used with AC. This is because we always measure AC voltages as root-mean-square (rms) values, not as peak values. For example, '100 V (AC)' actually peaks at 141 V*. So, applying 100 V (AC) to a capacitor rated at 100 V (DC) may cause its dielectric to fail. In this example, the maximum allowable AC voltage must be 70.7 V, which peaks at 100 V.(*To explain: Vrms = 0.707 Vmax )
500 volts rms is equivalent to what dc voltage level?
it will be no DC not unless diodes and capacitors are applied. rephrase the question
What electric device smooths the pulsed DC to a smoother DC?
In power supplies both coils and capacitors are used to smooth the pulsing DC output.
Why do you use a dc capacitor in table fans while an ac capacitor in a ceiling fan?
there is no separate capacitors for AC and DC. All capacitors are same. Electrolytic capacitors are manufactured by creating a die-electric by chemical etching or electroplating on one plate. Such capacitors when connected in AC circuit dislodges the die-electric material and thus results in short circuit between the two parallel plates of the capacitor. For AC circuits only non-electrolytic capacitors should be used. The common type is oil impregnated paper capacitor.
What is the formula to calculate beta DC?
beta dc= ic/ib!!
