Build a UPS for USB devices:
04/11/2002 EDN - Design Ideas / Portable
systems often include circuitry that derives
power from an external source, such as USB. When
the system disconnects from the USB supply, a
battery takes over and supplies current via a
dc/dc converter. A diode-OR connection (Figure
Micro-UPS Features Rapid Battery
Electronic Design - Ideas for Design /
Every circuit needs some sort of power source.
Frequently, the success of a circuit will be
made or broken by the convenience and
flexibility of its power supply. This is
particularly true of portable instrumentation,
which often must combine. . .
Off Line-UPS Offers Backup
01/10/00 Electronic Design - Ideas for Design /
With increased dependency on electric power for
various domestic, commercial purposes and the
seemingly declining capacity of power utilities
in many countries, the need for additional
backup power sources is on the rise. Various
modules are already. .