Hold-up Capacitance
 

This Excel calculation can be downloaded by ExcelCalcs subscribers.Please login or Subscribe.

Description:


Suggests a capacitance value for power-supply interruption based on several inputs like downstream circuit power dissipation, maximum holdup time, and voltage requirements.

High reliability electronics frequently require some sort of short-term power interruption tolerance, specified in milliseconds.  This worksheet will allow the user to find the amount of capacitance required to hold up a piece of electronics equipment.  The internal power supply (that regulates power from outside) often has a hold-up circuit that charges a capacitor whose voltage is bled off when power is interrupted.  A boost converter is used to store additional energy and gain a greater holdup margin.  When bled, the voltage off the capacitor is buck/boost regulated to normal operational range for the held-up equipment.  Large-value capacitors are greatly affected by temperature and have fairly large tolerances in addition.

Calculation Reference
Pasahow, Edward. Electronics Pocket Reference, 2nd Edition. New York: McGraw-Hill, 1994.
| Find on Amazon.com | Find on Amazon.co.uk | Find on Amazon.fr | Find on Amazon.de | Find on Amazon.ca |

 

Version History
Subscribe to this topic and get notified by mail about new posts Favorite to this topic Discuss this item in the forum. Check the version history to see how this calculation has changed over time. Use the Subscribe button to receive an automatic email should this calculation be updated to a higher version. Use the Favourite button so you can easily find this calculation in the future.

License:
(Generally not required)
No license to agree, but please suggest improvements!
Submitted On:
22 Dec 2009
Submitted By:
AB9BI
File Date:
21 Dec 2009
File Author:
Jason B Mansfield Sr
File Version:
1.0
File Size:
68.50 Kb
File Type:
xls
XLC:
This download requires the XLC Add-in for Excel to be installed.
Downloads:
31
Rating:
stars/0.gifTotal Votes:0
HTML Link:
Copy code below to your web page to create link to this page:
HTML Window:
Copy code below to your web page to create a dynamic window to this download:
Like This?:
View the profile of the person who submitted this calculation and see all their other calculations hosted at ExcelCalcs.
Need Help?:
Use the comment feature below to raise any questions relating to this download. The question will be automatically emailed the author and all users subscribing to this comment thread.

Please sign in or register to add a comment.

We have 7 guests and 36 members online
Contact Us
post/emailEmail (preferred method of contact)
telephone US +1 617 5008224
telephone EU +44 113 8152220
Our Feeds
Repository RSS. Forum RSS. User Comment RSS. News RSS.