|
Battery Backup Converter uses One NiCd Cell - 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.
Buck Converter Handles Battery Backup System - EDN-Design
Ideas: 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.....
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.
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.
Memory Supply Includes Battery Backup - EDN-Design Ideas
MicroController Provides SrAM Battery Backup - EDN-Design
Ideas: 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. |
