Aluminum Electrolytic Capacitors

gilamonsterbirdsElectronics - Devices

Nov 24, 2013 (3 years and 8 months ago)

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Aluminum Electrolytic Capacitors


More Bang for the Buck

Aluminum Electrolytic
Advantage


The high value capacitor choice


Typically last more than 10 years


Lowest cost dielectric for high capacitance
and energy storage


4 to 10 times the capacitance per dollar of
film capacitors


Great for power electronics bus capacitors
to 600 V

Aluminum Electrolytic

Principal Applications


Power
-
supply


input capacitors


output capacitors


Bus capacitors for inverters in


UPS systems


Motor
-
drives


Photoflash and Strobe Flash


Welders

Switching Power Supply
Application

Linear Power Supply
Application


Transformer steps 120 Vrms down to 12.6 Vrms


12.6 Vrms AC voltage is 35.6 V peak to peak


Fullwave rectified voltage is 0 to 16.4 V


Add 200 µF capacitor: filtered voltage is 16 V
with
±
0.4 V ripple voltage.

Ripple Current is King


Ripple is from rectification and switching


Ripple current heats the capacitor
(blue peaks below)


Higher temperature shortens capacitor life


But

operating life claims and calculation methods are not
standardized, so the capacitor maker with the best models,
technology, and technical sales force has an advantage

Temperature Rise


The temperature rise
D
T

is the thermal
resistance
q

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慭扩敮琠瑩a敳e瑨攠灯睥爠
P


D
T =
q
倠㴠
q
I
2
(
ESR)



To lower the temperature rise


lower thermal resistance
q


lower power
P


Lowering Temperature Rise


Lower thermal resistance
q

with
Thermal Pak capacitor construction


Lower power
P

with lower ESR from
new electrolytes, separators & foils


You can lower
q

with capacitor choice
and cooling with a fan or heatsink

Thermal Pak™



Compression Design
with extended
cathode, low
thermal resistance


Better shock and
vibration


Safety vent can’t be
blocked by tar


Lighter weight

Extended Cathode Handles
High Ripple Current

Extended
cathode foil

at right gets
heat out

Rilled

Potted

Double Peg
Compression

CDE Expected Life Calculator


Allows you to predict life with your
operating conditions


Calculates temperature rise and
expected life for


screw terminal capacitors


snap
-
in capacitors


Accurate

Based on extensive thermal
measurements of capacitor materials


The following is a CDE Calculator
Comparison of 550C to DCMC


Both in 3 inch diameter by 5⅝ long cans


550C is 3700 µF, 450 V


DCMC is 5600 µF, 450 V


Both 20 amps of ripple current at 360 Hz


Both 25 amps of ripple current at 2 kHz


Expected lives: 550C about 20 years,
DCMC about 1 year.

http://www.cde.com/calc

Screw Terminal
Capacitor Types

Type 550C, The 105
°
C
Inverter Capacitor

Type 550C, The 105
°
C
Inverter Capacitor


Longest life, highest ripple current type


Standard of comparison


200 V to 450 V, inverter voltage range


Compares with UCC LXR Series


Special specifications, part number
550CExxxx

Type 520C, The 85
°
C
Inverter Capacitor


High value, high ripple current type


The next step below Type 550C


200 V to 500 V, inverter voltage range


> 80% of Type 550C ripple capability


Compares with UCC RWF Series


Rifa PEH 105
°
C

Type 500C, Long
-
Life
Capacitor


Twice the life of Type DCMC


6.3 V to 500 V, wide range


> 60% of Type 550C ripple capability


Compares with


CDE Type 3188


Aerovox Type CG


Rifa PEH 169 85
°
C

Type DCMC, Best Value
Capacitor



General purpose, first
-
choice low cost


6.3 V to 550 V, widest range


150% of Type 550C capacitance


> 40% of Type 550C ripple capability


Compares with CDE Type 3186


Aerovox Type CGS


UCC U36D Series



Typical Hi
-
Ripple Lifetimes


4700 µF 450 V Comparison


60
°
C, 12 A @ 120 Hz, 400 V

Type

Case Size

Life

Price




(in)


(years)

(%)

DCMC

3x5


4.6

100

500C

3x5⅝

9.5

110

520C

3x5⅝

23.7

130

550C

3
½
x5⅝

48.8

142

The Snap
-
in Capacitors


Industry’s widest selection including


New Type SLPX 85
°
C, 3000 h, low cost


New Type SLP 105
°
C, 3000 h, low cost


25% smaller Types 380LQ & 381LQ


25% more ripple Type 381LR, 105
°
C


4 & 5 pin Types 382LX and 383LX


http://www.cde.com/catalog/alum/#snap
-
in

Type MLP, Flatpack Capacitor


Welded seal, flat capacitor can replace
multiple snap
-
ins in high ripple aps


New, 450 V. Now available 7.5 to 450 V


Double the ripple capability with a heatsink


50
-
year life with nearly hermetic seal


MLS with stainless case, 100 year life

Less than ½ inch tall

20 joules of energy storage

Easy to stack into modules

Easy to heatsink

Great at cold to

55
°
C

Next


Remember CDE Cornell Dubilier as

your source for aluminum electrolytic
capacitors


Enjoy the benefits of the life calculator
at http://www.cde/com/calc.htm


Go to major distributors for CDE Cornell
Dubilier capacitors.