METHOD AND CIRCUIT FOR MAINTAINING CHARGE IN A BACKUP BATTERY

A method eliminates the discharge of the backup battery (42) prior to the primary source of power initially being applied to the device. The method comprises detecting the application of a source of primary power (12) and providing a path by way of a switch (46) in response to receiving the power (1...

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Bibliographische Detailangaben
Hauptverfasser:	HAMMON, RICHARD L, GREEN, LAWRENCE MICHAEL
Format:	Patent
Sprache:	eng ; fre
Schlagworte:	CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTINGELECTRIC POWER CONVERSION OR DISTRIBUTION OF ELECTRIC POWER ELECTRICITY GENERATION SYSTEMS FOR STORING ELECTRIC ENERGY
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Beschreibung
Zusammenfassung:	A method eliminates the discharge of the backup battery (42) prior to the primary source of power initially being applied to the device. The method comprises detecting the application of a source of primary power (12) and providing a path by way of a switch (46) in response to receiving the power (14), wherein the path allows the backup battery to power the device. Also, a circuit for maintaining the charge in a backup battery (42) of a device before primary power is applied comprises a sensing circuit (60) for generating an activation signal after initially sensing the application of the primary power to the device, and a switch element (61)coupled the sensing circuit (60) to receive the activation signal. The switch element (61 ) providesa path for the backup battery (42) to power the device. Accordingly, the method and circuit allow manufacturers of devices incorporating a backup battery (42) to install the backup battery (42) prior to shipping and eliminate the requirement for the purchaser of the device to install the backup battery (42).