直並列コンデンサ 計算ツール
合成容量の即時計算
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Quick Answer
Capacitors in parallel ADD: C_total = C1 + C2 + ... Capacitors in series use the reciprocal formula: 1/C_total = 1/C1 + 1/C2 + ... This is the OPPOSITE of how resistors combine.
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涓﹀垪銈炽兂銉囥兂銈?
C鍚堣▓ = C1 + C2 + C3 + ... + Cn
鐩村垪銈炽兂銉囥兂銈?
1/C鍚堣▓ = 1/C1 + 1/C2 + ... + 1/Cn
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- *鎶垫姉瑷堢畻銉勩兗銉?
- *銉偄銈偪銉炽偣瑷堢畻銉勩兗銉?
Design Notes
Capacitor networks are everywhere in electronics. Parallel combinations increase total capacitance and reduce ESR — essential for power supply decoupling where multiple small MLCCs outperform one large electrolytic. Series combinations increase voltage rating at the cost of capacitance. When mixing types in parallel (e.g., 100µF electrolytic + 100nF ceramic), each type handles a different frequency range, providing broadband filtering.
Common Mistakes
- 1
Confusing capacitor series/parallel rules with resistor rules — they are OPPOSITE. Capacitors in parallel add (like resistors in series).
- 2
Putting capacitors in series without balancing resistors. Without equalization, voltage distributes unevenly and one capacitor may exceed its voltage rating.
- 3
Using only large capacitors for decoupling. Large caps have high ESL and poor high-frequency response. Always add small MLCCs in parallel.
Engineering Handbox
1. Parallel: simply add all values 2. C_total = 10 + 22 + 47 = 79 µF 3. For series: 1/C = 1/10 + 1/22 + 1/47 = 0.1 + 0.0455 + 0.0213 = 0.1667 4. C_series = 1/0.1667 = 6.0 µF
Knowledge Base
コンデンサの並列は？
直接加算：C合計 = C1 + C2 + ... 抵抗とは逆の動作です。
直列の公式は？
1/C合計 = 1/C1 + 1/C2 + ... 最小の個別容量より常に小さくなります。
なぜ直列にする？
耐圧を上げるため。各コンデンサが全電圧の一部のみ負担します。均等化抵抗も必要です。
異なるタイプを並列にできる？
はい、むしろ推奨：100µF電解 + 100nFセラミックで広帯域デカップリング。
並列でESRはどうなる？
ESR（等価直列抵抗）が低下し、電源のリプルが減少、高周波性能が向上します。
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