These are available for momentary-duty AC applications like motor starting and voltage-reversing applications, but the high DF of aluminum electrolytic capacitors – from 2% to 150% – causes excess heating and short life in most AC applications.
not withstand voltage reversal in excess of 1.5 V. While non-polar aluminum electrolytics are available for momentary-duty AC applica-tions like motor starting and voltage-reversing applications, the high DF of aluminum electrolytic capacitors – from 2% to 150% – causes ex
One important property of an Aluminum Electrolytic Capacitor is the leakage current flowing thru the dielectric when an DC voltage is applied. The leakage current depends on one side of the thickness of the dielectric layer, so the so called over forming factor (TDK).
Aluminum electrolytic capacitor construction delivers colossal capacitance because etching the foils can increase surface area more than 100 times and the aluminum-oxide dielectric is less than a micrometer thick. Thus the resulting capacitor has very large plate area and the plates are intensely close together.
The TDK aluminum electrolytic capacitors feature outstanding ripple current capabilities and very long-term reliability. Design flexibility and engineering expertise allow TDK to offer custom specific solutions. The capacitance of aluminum electrolytic capacitors is defined by the surface of the aluminum anode foil.
The core material of Aluminum electrolytic capacitors is a high purity 4 N 99.99% etched and formed Aluminum foil with standard thickness with between 80 μm and 125 μm (Ebel, 2003; JCC -Foil). Examples of high and low voltage anode foils are shown in Fig. 3. A high voltage anode foil contains up to 1.2 Mio tunnel of a length of ca 40 μm per cm 2.