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Battery Backup
Circuits Last Updated on:
Monday, October 03, 2011 06:07 PM
Links to electronic circuits, electronic schematics, designs for engineers, hobbyists,
students & inventors:
Battery Backup Converter uses One NiCd Cell - 02/03/97 EDN-Design
Ideas Notebook computers and or portable equipment often use a
backup battery to retain memory contents during replacement of main
battery. Such "bridge batteries" usually consist of five or six
series-connected NiCd coin cells. They're expected to keep system
alive for approximately 5 minutes—plenty of time to swap batteries....
[Design Idea by David Bell, Linear Technology, Milpitas, CA]
Buck converter handles battery-backup system - 24-Apr-03 Issue
of EDN A synchronous buck converter is inherently bidirectional.
That is, it transfers energy from input to output as a buck regulator when
the output voltage is low, but, when the output voltage is high, the
converter acts as a boost regulator, transferring power from output to
input. This Design Idea shows how to use this bidirectional energy
transfer to automatically recharge a battery when the mai.... [Design Idea
by Haresh Patel, Linear Technology Corp, Milpitas, CA]
Emergency Lighting Systems & Battery Powered Fluorescent Lighting - Zetec
Semiconductors Applications Notes An overview of the principles behind typical
emergency lighting systems, fluorescent tube behaviour, and the requirements of the
transistors for efficient voltage inversion. The note also includes two "Royer" based
designs for low voltage systems. (app note added 2/06)
Emergency Power - This unit was constructed in a plastic 4-outlet juction
box ($5 from Home Depot). The front panel is cut from 60-thou Lexan, and a
scrapped Pep-Boys battery charger provided the transformer. The PIC16F870 keeps
track of battery voltage as well as both charging and discharging currents. ….(design
added 08/08) [Luhan Monat - Mesa Arizona]
Memory Supply Includes Battery Backup - 02/03/97 EDN-Design Ideas
[Design Idea added 6/06] EDN migrating links. This link is not verified. Search
the "title" EDN for new link.
Microcontroller provides SRAM battery backup - 26-Jun-03 Issue of EDN
To maintain content in the event of power loss, many designs that include SRAM require
a dedicated device that can automatically switch from a standard power supply to
battery operation. Microcontrollers seldom find use in power-switching applications.
Because microcontrollers typically operate from the primary power supply, they stop
execution if that supply drops, thereby making it impossible.... [Design Idea by Dave
Bordui, Cypress Semiconductor, Orlando, FL]
