Knowledge of Aluminum Electrolytic Capacitors The capacitance of electrolytic capacitors depends on the impedance exhibited when operating at AC voltage. Therefore, the capacitance value, that is, the value of the AC capacitor, varies with the operating frequency, voltage, and measurement method. In the standard JISC 5102, the capacitance of the aluminum electrolytic capacitor is measured under the conditions of a frequency of 120 Hz, a maximum AC voltage of 0.5 Vrms, and a DC bias voltage of 1.5 to 2.0 V. It can be asserted that the capacity of an aluminum electrolytic capacitor decreases as the frequency increases.
In the equivalent circuit of the capacitor, the ratio of the series equivalent resistance ESR to the capacitive reactance 1/ωC ​​is called Tan δ, where the ESR is the value obtained at 120 Hz. Obviously, Tan δ becomes larger as the measurement frequency increases, and increases as the measurement temperature decreases.
Impedance Z At a specific frequency, the resistance that blocks the passage of alternating current is the so-called impedance (Z). It is closely related to the capacitance value and inductance value in the capacitor equivalent circuit, and is also related to ESR. Http://news.chinawj.com.cn Editor: (Hardware Business Network Information Center) http://news.chinawj.com.cn
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