[China Aluminum Network] Aluminum electrolytic capacitors There are many types of aluminum electrolytic capacitors, some of which can significantly reduce the ESR, but there is no qualitative change. ESR is mainly caused by the cathode resistance of the electrolytic capacitor. Increasing the conductivity of the cathode material of the electrolytic capacitor can improve the performance of the electrolytic capacitor, and the organic polymer cathode of the aluminum polymer electrolytic capacitor can make the conductivity reach 300ms/cm, or even 3000ms/. Cm, this cathode material can make the ESR of the electrolytic capacitor very low.
The structure of the aluminum polymer electrolytic capacitor is the same as that of an ordinary aluminum electrolytic capacitor except that the cathode material of the lead type aluminum polymer electrolytic capacitor is replaced with an organic semiconductor extract. Solid aluminum polymer chip capacitors are a unique combination of aluminum electrolytic capacitors and tantalum capacitors. As with conventional aluminum electrolytic capacitors, the anode aluminum electrode plates and aluminum oxide layers of solid aluminum polymer chip capacitors are fabricated on the anodized process. In solid-state aluminum polymer chip capacitors, a high-conductivity polymer electrode film is deposited on alumina as a cathode, and carbon and silver are lead-out electrodes of a cathode, which is similar to a solid-state tantalum electrolytic capacitor.
Aluminum Polymer Electrolytic Capacitors Electrical Performance ESR and Rated Ripple Current Larger characteristics of aluminum polymer electrolytic capacitors are the small ESR, solid-state aluminum polymer chip capacitors have lower ESR than solid state helium, and even lower than helium-polymer combined capacitors. The reason is that the solid conductor polymer is used, which means that it can withstand strong ripple current. The ESR of an electrolytic capacitor is mainly determined by the resistance of the electrode. The electrode resistance of the solid aluminum polymer capacitor is much smaller than that of other electrodes and is almost zero.
Impedance frequency characteristics in the low frequency range (less than 10kHz) and high frequency band (higher than 20MHz), aluminum polymer electrolytic capacitors and low ESR aluminum electrolytic capacitors, tantalum electrolytic capacitors have similar performance. In the mid-frequency band where the switching power supply output rectification and filtering and digital circuit power supply bypass are more effective, there are obvious differences, especially around 1 MHz, and the difference is very obvious. The impedance of aluminum polymer electrolytic capacitors is lower, the tantalum electrolytic capacitors are next, and the relative impedance of ESR aluminum electrolytic capacitors is nearly one and a half orders of magnitude higher. Shows that aluminum polymer electrolytic capacitors are more effective in the above applications.
Influence of Voltage on Capacitance The capacitance of aluminum polymer electrolytic capacitors is almost independent of the applied voltage, while the capacitance of ceramic capacitors decreases significantly (approx. 20%) as the applied voltage increases.
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