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Document Number: 28362

196

Revision: 17-Oct-03

196 DLC

Vishay BCcomponents

Double Layer Capacitors

MEASURING OF CHARACTERISTICS

CAPACITANCE (C)

Capacitance shall be measured by constant current discharge method.

DISCHARGE CURRENT AS A FUNCTION OF RATED CAPACITANCE

PARAMETER

VALUE

UNIT

0.047

0.1

0.22

0.33

0.47

0.68

1.0

F

0.1

1.0

mA

Leakage current shall be measured after 30 minutes

Fig.4

Voltage diagram for capacitance measurement.

30 min

T (s)

time

0

2.0

U

U

(V)

R

CF

()

I

–

Ts

()

×

×

U

() 2

–

--------------------------------------------------------

=

Fig.5 Test circuit for capacitance measurement.

A

V

CONSTANT

CURRENT

DISCHARGER

C

R

()

V

()

10

3

–

----------------

=

V

A

1 mA

C

1 kHz

I

()

VV

()

10

4

–

-------------

=

Fig.7 Test circuit for leakage current.

V

Ω

Rs 100

C

Fig.8 Typical leakage current as a function of time.

Curve1:1.0 F, 5.5V.

Curve2:0.47F, 5.5 V.

Curve3:0.22F, 5.5 V.

Curve4:0.1 F, 5.5V.

Curve 5: 0.047 F, 5.5 V.

Ω.

50

110

20

30

40

1

10

2

10

(

µA)

I

L

time (hours)

2

3

4

5

1