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Old 9th March 2005, 01:37 AM   #1
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Default Computer Grade/Inverter Grade Cap

Hi all expert,

Anyone can explain what is Computer Grade Cap and Inverter Grade Cap? (Other than used in computer and inverter. )

I know the computer grade cap is more expensive. Some of them are in high voltge (e.g. 450V DC), it doesn't look like used in computer......

I think it may be just 2 grade of cap (obviously higher than ordinary cap).

But what is the specification/range for a cap can be called as computer grade/inverter grade?

Computer Grade is higher or Inverter Grade is higher?

Thank you in advance.

Tuna Fish
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Old 11th March 2005, 04:31 AM   #2
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Cornell-Dubilier's 550C inverter-grade capacitor combines low ESR values and 15,000-hour full-rated life for use in motor-drive and inverter applications. The 550C is available in capacitance values as high as 35,000 F at 200V and to 8100 F at 450V. Rated ripple currents are as high as 45A at 120 Hz and 85C. Expected operating life is 15,000 hours at rated conditions and 100,000 hours at 65C and 80% rated ripple current.
Looks like high current and low ESR.

Im assuming computer grade is just low ESR and long life as well..
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Old 11th March 2005, 02:51 PM   #3
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The high voltage caps(eg 450v) are for SMPS primary side switching power stage.

Talking about computer/inverter grade caps,think about low ESR,able to sustain high frequency ripple,fast discharging(if i was not wrong).

But as for audio,doesn't mean that they are absolutely suitable.

If computer/inverter caps are really suitable,then no such things as "audio grade caps"!
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