Information

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Gold Capacitors Technical Guide
Principles and Operation of Gold Capacitors
2-4-2 Internal Resistance
The equivalent circuit of an electric double layer capacitor consists of many small capacitors having various internal
resistance values. Normally, the values of these resistors would be expressed in DC values. However, so that a true
picture may be established, we will use impedance (@ 1kHz) as the parameter and being that the DC resistance and
Z value are not equal, we must consider their relationship under current conditions.
2-4-3 Current
If current is measured 30 to 60 minutes after applying the rated voltage, a resulting large current (several 10µA) will
be present. This is due to the fact that the measured current is the sum of the charging currents that are fl owing
through the many small capacitors shown in the equivalent circuit. As it is extremely diffi cult to determine the
leakage current of electric double layer capacitors, the current value specifi ed as the leakage current is somewhat
meaningless. It takes a minimum of 10 hours to fully charge the capacitor so that a meaningful leakage current value
can be obtained.
2-4-4 Charging Characteristics
The charging characteristics of an electric double layer capacitor
can be represented by equation (4):
Because of the many internal resistances within the electric double
layer capacitor, no external current limiting resistor is needed.
(3)
(4)