Boost Battery Output Voltage to extend Backup Power Availability at System Power Input
Original Publication Date: 2004-Nov-17
Included in the Prior Art Database: 2004-Nov-17
In systems that require non-volatile data to be battery backed the general method is to provide a battery and battery charger function. The batteries become connected to the load (non-volatile data) when the normal power supply loses AC input, either intentionally or accidentally. Once connected, the batteries are drained by the load to a point when the battery voltage decays beyond a useful voltage level, at which point they become ineffective and the load loses it battery power. It is important to note that the battery system generally continues to have some remaining charge but whose output voltage is below the acceptable input voltage of the load, generally received by a voltage regulator. A method and apparatus is needed to take advantage of this remaining (useless) battery charge. This disclosure provides for a Battery Boost function which senses when the batteries are discharged to such a state and then boosts the battery voltage to a usable voltage level which in turn can be used to power the load.