{"id":13342,"date":"2023-08-08T14:56:53","date_gmt":"2023-08-08T14:56:53","guid":{"rendered":"https:\/\/digitalgateamg.com\/?p=13342"},"modified":"2023-08-09T08:11:52","modified_gmt":"2023-08-09T08:11:52","slug":"capacitance-preservation-strategies-for-dc-bias-in-mlccs","status":"publish","type":"post","link":"https:\/\/digitalgateamg.com\/de\/blog\/2023\/08\/08\/capacitance-preservation-strategies-for-dc-bias-in-mlccs\/","title":{"rendered":"Kapazit\u00e4tserhalt: Strategien f\u00fcr DC-Vorspannung in MLCCs"},"content":{"rendered":"
<\/div>\n\n\n\n

Ist die Kapazit\u00e4t des Kondensators immer gleich?<\/mark><\/h2>\n\n\n\n

Multilayer ceramic capacitors (MLCCs) offer several advantages that make them a popular choice for various electronic applications, including high energy density, low cost, and a wide range of capacitance options. However, they are not without drawbacks, one of which is the capacitance reduction effect when subjected to a constant or DC voltage. This effect is commonly referred to as “DC bias”<\/strong> and information dedicated to this phenomenon can be found on manufacturers’ websites.<\/p>\n\n\n\n

Unter Ingenieuren gilt die Faustregel, einen Kondensator mit einer Nennspannung zu verwenden, die 1,5 - 2-mal h\u00f6her ist als die Betriebsspannung. In bestimmten F\u00e4llen, in denen eine maximale Optimierung der St\u00fcckliste erforderlich ist, k\u00f6nnte man sich jedoch fragen, ob es m\u00f6glich ist, ein 16 V X5R MLCC in einer Schaltung mit einer Arbeitsspannung von 10 V zu verwenden. Was w\u00fcrde in einem solchen Szenario mit der Kapazit\u00e4t passieren? Wie unerw\u00fcnscht w\u00e4re ihre Reduzierung? <\/p>\n\n\n\n

Und was ist, wenn die Spannung nur f\u00fcr ein paar Sekunden ansteigt? In diesem Artikel werden wir uns mit den theoretischen Grundlagen dieses Problems befassen und praktische L\u00f6sungen untersuchen.<\/p>\n\n\n\n

<\/div>\n\n\n\n

Die Ursache des Problems<\/strong><\/h2>\n\n\n\n

The issue lies with the material BaTiO3, which serves as the dielectric in capacitors. When subjected to an alternating voltage, dipoles in BaTiO3 can freely reorient under the influence of an electric field, providing capacitance for charge storage. However, when a DC voltage is present, a portion of the dipoles becomes “locked” and cannot fully reorient. This reduces the effective capacitance of the capacitor for noise suppression or ripple smoothing.<\/p>\n\n\n

\n
\"\"<\/figure>\n<\/div>\n\n\n

Abbildung 1 - Die Struktur des MLCC-Kondensators (Bildquelle: KEMET)<\/p>\n\n\n\n

<\/div>\n\n\n\n

Gleichspannung und Herstellereinfluss<\/strong><\/h2>\n\n\n\n

As mentioned earlier, increasing the DC voltage on the capacitor intensifies the locking of dipoles by the electric field. As a result, its capacitance decreases closer to the nominal voltage. The magnitude of this reduction depends on the manufacturer’s technology since each uses unique manufacturing methods. An example of such a reduction is shown below.<\/p>\n\n\n

\n
\"\"<\/figure>\n<\/div>\n\n\n

Figure 2 – Capacitance Loss with DC Bias on 1\u00b5F 50V X7R Capacitor in MLCC 0805 Package from Three Different suppliers.<\/p>\n\n\n\n

<\/div>\n\n\n\n

Gr\u00f6\u00dfe<\/strong><\/h2>\n\n\n\n

The capacitor’s size strongly influences its effective capacitance. Smaller dielectrics result in a higher percentage of dipoles being locked by the constant voltage, thereby intensifying the effect on capacitance. This means that the impact of voltage will vary for identical capacitors in different package sizes. An example is illustrated for 1\u00b5F \u00b110% X7R 25V <\/strong>capacitors in various packages.<\/p>\n\n\n

\n
\"\"<\/figure>\n<\/div>\n\n\n

Figure 3 – Capacitance Loss with DC Bias on 1\u00b5F 50V X7R Capacitor in different packages.<\/p>\n\n\n\n

<\/div>\n\n\n\n

Dielektrika<\/strong><\/h2>\n\n\n\n

Die Verwendung eines h\u00f6herwertigen Dielektrikums ist eine M\u00f6glichkeit, die effektive Kapazit\u00e4t zu erhalten. Dielektrika der ersten Klasse (NP0, C0G) beseitigen Probleme mit Gleichstromvorspannung. Solche Dielektrika sind jedoch teuer und in der Regel f\u00fcr kritische Anwendungen reserviert. H\u00e4ufiger verwendet werden zweitklassige Dielektrika wie X8L, X7R, X5R usw. Abbildung 4 zeigt, wie die Gleichstromvorspannung je nach Dielektrikumstyp variiert, auch wenn verschiedene Dielektrikumstypen in einigen F\u00e4llen \u00e4hnliche Vorspannungswerte aufweisen k\u00f6nnen.<\/p>\n\n\n

\n
\"\"<\/figure>\n<\/div>\n\n\n

Figure 4 – Capacitance Loss with DC Bias on 1\u00b5F 50V 0805 Capacitor in different dielectrics.<\/p>\n\n\n\n

<\/div>\n\n\n\n

Kapazit\u00e4t<\/strong><\/h2>\n\n\n\n

Auf den ersten Blick k\u00f6nnte man meinen, dass die Verwendung eines Kondensators mit einem h\u00f6heren Kapazit\u00e4tswert zu einer h\u00f6heren effektiven Kapazit\u00e4t f\u00fchren w\u00fcrde. Dies ist jedoch nicht immer der Fall. Manchmal kann ein Kondensator mit einer h\u00f6heren Kapazit\u00e4t eine st\u00e4rkere Reduzierung erfahren. Das liegt daran, dass eine h\u00f6here Kapazit\u00e4t bei gleicher Geh\u00e4usegr\u00f6\u00dfe zu einer h\u00f6heren Dichte von Dipolen pro Volumeneinheit f\u00fchrt. Folglich wird bei gleichem elektrischem Feld (d. h. bei angelegter konstanter Spannung) eine gr\u00f6\u00dfere Anzahl von Dipolen verriegelt, das f\u00fchrt zu einer geringeren effektiven Kapazit\u00e4t. Abbildung 5 zeigt ein solches Verhalten f\u00fcr 1\u00b5F \u00b110 % X7R-Kondensatoren im 0603-Geh\u00e4use mit unterschiedlichen Nennspannungen.<\/p>\n\n\n

\n
\"\"<\/figure>\n<\/div>\n\n\n

Figure 5 – Capacitance Loss with DC Bias on 1\u00b5F 50V X7R 0603 Capacitor in different dielectrics.<\/p>\n\n\n\n

<\/div>\n\n\n\n

Zeit<\/strong><\/p>\n\n\n\n

The voltage drop does not occur instantaneously, and it takes some time for the dipoles to become “locked.” It is essential to understand this to avoid fearing a capacitance decrease due to short-duration voltage spikes. According to the graph in Figure 6, the most significant capacitance drop occurs within the first 1-3 minutes. However, it does not stop there; the reduction continues even after an hour, two hours, or even 100 hours.<\/p>\n\n\n

\n
\"\"<\/figure>\n<\/div>\n\n\n

Figure 6 – Capacitance drop with time under DC Voltage BIAS (Image source: Panasonic)<\/p>\n\n\n\n

<\/div>\n\n\n\n

Schlussfolgerungen<\/strong><\/p>\n\n\n\n

Zusammenfassend k\u00f6nnen wir die wichtigsten Methoden zur Erhaltung der effektiven Kapazit\u00e4t hervorheben:<\/p>\n\n\n\n

\u2022 Verwendung einer gr\u00f6\u00dferen Packungsgr\u00f6\u00dfe<\/p>\n\n\n\n

\u2022 Verwendung von hochwertigen Dielektrika<\/p>\n\n\n\n

\u2022 Verwendung von Kondensatoren mit h\u00f6heren Spannungswerten<\/p>\n\n\n\n

\u2022 Verwendung von Kondensatoren mit einem geringen Spielraum bei der Nennkapazit\u00e4t<\/p>\n\n\n\n

Nevertheless, each of these rules has exceptions, which is why, at DigitalGate<\/strong>, we always verify the DC Bias for each capacitor on the manufacturer’s website during the design phase to ensure our clients’ devices operate without any issues. By being mindful of the impact of DC Bias and employing appropriate mitigation strategies, engineers can optimize their electronic designs for improved performance and reliability.<\/p>\n\n\n\n

<\/div>\n\n\n\n

\u00dcber den Autor: <\/h2>\n\n\n\n

Vladislav Mokluza<\/strong> ist ein Hardware-Ingenieur, der sich auf Schaltkreisdesign und PCB-Entwicklung in DigitalGate spezialisiert hat. DigitalGate bietet innovative Hardware- und Software-Entwicklungsdienstleistungen f\u00fcr modernste eingebettete Systeme an, die den Qualit\u00e4tsstandards der jeweiligen Branchen entsprechen. Da wir ein flexibles und wettbewerbsf\u00e4higes Unternehmen sind, haben wir Kunden in der ganzen Welt, insbesondere in Nordamerika, Europa und Asien.<\/p>\n\n\n\n

<\/p>","protected":false},"excerpt":{"rendered":"

Is the capacitance of the capacitor always same? Multilayer ceramic capacitors (MLCCs) offer several advantages that make them a popular choice for various electronic applications, including high energy density, low cost, and a wide range of capacitance options. 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Multilayer ceramic capacitors (MLCCs) offer several advantages that make them a popular choice for various electronic applications, including high energy density, low cost, and a wide range of capacitance options. 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