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Parallel Sections

We also studied an alternative approach to reducing ESR using capacitor sections connected in parallel shown in Figures 17,18, 19 and 20.

Frequency plots, Figures 21 and 22 compare these parallel configurations and single capacitors made with wider film.

The ESR values are compared in Table 10.

The test results demonstrate that capacitor sections designed with relatively narrow film widths and connected in parallel offer a viable design option for a-c applications requiring exceptionally low ESR. The "parallel" design approach would use a rectangular or "bathtub" case with the added advantage of reduced inductance, a definite "plus" for applications in the frequency range of over 50kHz. The rectangular parts additionally offer easier fit and mounting.
        

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Table 10
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Total CAP
(µF)		 Film Width
(inches)		 # Parallel
Parts		 ESR 100kHz
(milliohms)
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20
20
10
10
3
3
1.5
1.5		 2
1
2
1
2
1
1
1/2		 -
2x10µF
-
2x5µF
-
2x1.5µF
-
2x.75µF		 2.1
1.2
3.2
1.6
7.8
2.3
4.7
1.5
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Dearborn Electronics, Inc.
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