How to measure leakage current of supercaps

    In generally,  leakage current  is current that flows in supercaps that is thought to be in a “off” mode where ideally no current would flow. For  internation standard:IEC 62391-1,Leakeage current is a value of current that folws through a supercaps after a charge for a fixed period of time, given in ampres(A)

leakage current -supercaps

leakage current -supercaps

    1.measuring method

a)Discharge duration

Before this measurement is made, the supercaps shall be fully discharged. Discharge procedure shall take 1h to 24h and shall be specified in the relevant specification.

b)The leakage current shall be measured, unless otherwise prescribed in the relevant specification, using the direct voltage(UR) appropriate to the test temperature. Elecrification period after maximum 30min charge-up time to reach 95% of the applied voltage shall be selected from 30 min, 1 h, 2 h, 4 h, 8 h, 12 h, 24 h or 48 h and shall be specified in the relevant specification.

c)A steady source of power such as a regulated power supply shall be used.

d)Unless otherwise specified in the relevant specification, apply the voltage to a capacitor through a protective resistor of 1 000 Ω or less.

2.The relevant specification shall prescribe:

a)The leakage current limit at a reference temperature of 20℃,and at other specified temperatures;

b)When necessary, the correction factor, if the measurements are made at a temperature other than 20 ℃, but within the range of temperatures covered by the standard atmospheric conditions for testing;

c)The electrification time;

d)Resistance value of protective resistor other than 1000 Ω

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