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Aluminum Electrolytic Capacitors PowerPoint Presentation

Aluminum Electrolytic Capacitors

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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

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 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

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

Compression Design with extended cathode, low thermal resistance

Better shock and vibration

Safety vent can’t be blocked by tar

Lighter weight

Thermal Pak™Extended Cathode Handles High Ripple Current resistance

Extended cathode foil at right gets heat out

Double Peg Compression

Potted

Rilled

CDE Expected Life Calculator resistance

- 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 resistance

- 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 resistance

Screw Terminal Capacitor Types resistance

Type 550C, The 105 °C Inverter Capacitor resistance

Type 550C, The 105 °C Inverter Capacitor resistance

- 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 resistance

- 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 resistance

- 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 resistance

- 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 resistance 4700 µF 450 V Comparison 60 °C, 12 A @ 120 Hz, 400 V

Industry’s widest selection including resistance

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 CapacitorsWelded 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 CapacitorLess than ½ inch tall20 joules of energy storageEasy to stack into modulesEasy to heatsink Great at cold to –55 °C

Next high ripple aps

- 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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