Aluminum Electrolytic Capacitors

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Aluminum Electrolytic Capacitors

• More Bang for the Buck

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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

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Aluminum Electrolytic Principal Applications

• Power-supply input capacitors
  output capacitors
• Bus capacitors for inverters in
  UPS systems Motor-drives
• Photoflash and Strobe Flash
• Welders

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Switching Power Supply Application
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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.

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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

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Temperature Rise

• The temperature rise DT is the thermal resistance
  q from the capacitor core to ambient times the
  power P DT qP qI2(ESR)
• To lower the temperature rise
  lower thermal resistance q lower
  power P

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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

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Thermal Pak

• Compression Design with extended cathode, low
  thermal resistance
• Better shock and vibration
• Safety vent cant be blocked by tar
• Lighter weight

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Extended Cathode Handles High Ripple Current
Extended cathode foil at right gets heat out
Double Peg Compression
Potted
Rilled
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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
• AccurateBased on extensive thermal measurements
  of capacitor materials

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

• Both in 3 inch diameter by 5? 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.

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http//www.cde.com/calc
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Screw Terminal Capacitor Types
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Type 550C, The 105 C Inverter Capacitor
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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

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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
• gt 80 of Type 550C ripple capability
• Compares with UCC RWF Series
  Rifa PEH 105 C

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Type 500C, Long-Life Capacitor

• Twice the life of Type DCMC
• 6.3 V to 500 V, wide range
• gt 60 of Type 550C ripple capability
• Compares with CDE Type 3188 Aerovox Type CG
  Rifa PEH 169 85 C

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Type DCMC, Best Value Capacitor

• General purpose, first-choice low cost
• 6.3 V to 550 V, widest range
• 150 of Type 550C capacitance
• gt 40 of Type 550C ripple capability
• Compares with CDE Type 3186
  Aerovox Type CGS UCC
  U36D Series

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Typical Hi-Ripple Lifetimes 4700 µF 450
V Comparison 60 C, 12 A _at_ 120 Hz, 400 V
Type Case Size Life Price
  (in) (years) ()
DCMC 3x5? 4.6 100
500C 3x5? 9.5 110
520C 3x5? 23.7 130
550C 3½x5? 48.8 142
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The Snap-in Capacitors

• Industrys widest selection including
• New Type SLPX 85C, 3000 h, low cost
• New Type SLP 105C, 3000 h, low cost
• 25 smaller Types 380LQ 381LQ
• 25 more ripple Type 381LR, 105C
• 4 5 pin Types 382LX and 383LX
• http//www.cde.com/catalog/alum/snap-in

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Type MLP, Flatpack Capacitor
Less than ½ inch tall20 joules of energy
storageEasy to stack into modulesEasy to
heatsink Great at cold to 55 C

• 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

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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.