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Aluminum Electrolytic Capacitors

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

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Aluminum Electrolytic Capacitors

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  1. Aluminum Electrolytic Capacitors More Bang for the Buck

  2. 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

  3. Aluminum Electrolytic Principal Applications • Power-supply input capacitors output capacitors • Bus capacitors for inverters in UPS systems Motor-drives • Photoflash and Strobe Flash • Welders

  4. Switching Power Supply Application

  5. 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.

  6. 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

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

  8. 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

  9. Compression Design with extended cathode, low thermal resistance Better shock and vibration Safety vent can’t be blocked by tar Lighter weight Thermal Pak™

  10. Extended Cathode Handles High Ripple Current Extended cathode foil at right gets heat out Double Peg Compression Potted Rilled

  11. 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

  12. 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.

  13. http://www.cde.com/calc

  14. Screw Terminal Capacitor Types

  15. Type 550C, The 105 °C Inverter Capacitor

  16. 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

  17. 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

  18. 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

  19. 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

  20. Typical Hi-Ripple Lifetimes 4700 µF 450 V Comparison 60 °C, 12 A @ 120 Hz, 400 V

  21. 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 The Snap-in Capacitors

  22. 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 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

  23. 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.

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