Capacitor circuit and power conversion circuit including a resonant frequency adjustment element
First Claim
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1. A capacitor circuit comprising:
- a first capacitor line including a first capacitor;
a second capacitor line connected in parallel with the first capacitor line, including a second capacitor, and having an electrical characteristic different from an electrical characteristic of the first capacitor line; and
a resonant frequency adjustment element arranged to adjust a reactance of at least one of the first and second capacitor lines so that a first series resonant frequency of the first capacitor line and a second series resonant frequency of the second capacitor line are matched at a particular frequency;
whereinthe second capacitor has a greater allowable ripple current than the first capacitor;
the first capacitor and the second capacitor are smoothing capacitors; and
an impedance of the first capacitor line at the particular frequency is greater than an impedance of the second capacitor at the particular frequency.
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Abstract
A capacitor circuit includes a first capacitor line including a film capacitor and a second capacitor line including a ceramic capacitor that are connected in parallel with each other. The second capacitor line includes an inductance element that is connected in series with the ceramic capacitor. The inductance element is set to a value such that a series resonant frequency of the first capacitor line and a series resonant frequency of the second capacitor line are matched.
9 Citations
8 Claims
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1. A capacitor circuit comprising:
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a first capacitor line including a first capacitor; a second capacitor line connected in parallel with the first capacitor line, including a second capacitor, and having an electrical characteristic different from an electrical characteristic of the first capacitor line; and a resonant frequency adjustment element arranged to adjust a reactance of at least one of the first and second capacitor lines so that a first series resonant frequency of the first capacitor line and a second series resonant frequency of the second capacitor line are matched at a particular frequency;
whereinthe second capacitor has a greater allowable ripple current than the first capacitor; the first capacitor and the second capacitor are smoothing capacitors; and an impedance of the first capacitor line at the particular frequency is greater than an impedance of the second capacitor at the particular frequency. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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Specification
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Current AssigneeMurata Manufacturing Co Limited, Shizuki Electric Company Incorporated
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Original AssigneeMurata Manufacturing Co Limited
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InventorsKobayashi, Shinichi, Oka, Shoji, Nishiyama, Shigeki, Obara, Kazuyoshi
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Primary Examiner(s)Berhane, Adolf
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Assistant Examiner(s)GBLENDE, JEFFREY A
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Application NumberUS12/958,477Publication NumberTime in Patent Office1,013 DaysField of Search363/13, 363/15, 363/39, 363/44, 363/47, 363/81, 363/84, 363/125US Class Current363/40CPC Class CodesH02M 1/14 Arrangements for reducing r...H02M 1/4266 using passive elementsY02B 70/10 Technologies improving the ...
