Method and circuit for maintaining charge in a backup battery

Details Method and circuit for maintaining charge in a backup battery Method and circuit for maintaining charge in a backup battery

H - Electricity

02

J

H02J 7/10 (2006.01) H02J 7/00 (2006.01) H02J 9/06 (2006.01)

Patent

CA 2138504

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).

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