This part of IEC 62391 applies to fixed electric double layer capacitors (called” supercapacitors”) mainly used in DC circuits of electronic equipment.
Measuring method(refer to figure: Self-discharge test diagram)
- Before this measurement is made, the supercapacitor shall be fully discharged. Discharge procedures shall take 1h to 24h and shall be specified in the relevant specification.
- Apply the rated voltage UR directly to the supercapacitor terminals, without using a protective resistor. Unless otherwise specified by the relevant specifications, charging time shall be 8 h, including maximum 30 min charge-up time to reach 95% of the applied voltage.
- Disconnect the capacitor terminals from the voltage source. Unless otherwies specified in the detail specification, the capacitor shall be kept under standard conditons for 16 h or 24h.
- The internal resistance of the d.c. voltmeter used shall have a value of at lease 1MΩ.
Figure: Self-discharge test diagram
The relevant specification shall prescribe
a) discharge duration;
b) applied voltage other than the rated voltage;
c) charging time other than 8 h;
d) the time period between disconnecting the capacitor from the charging voltage and measurement.
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