POWER SOURCE SWITCHING APPARATUS AND METHODS FOR DUAL-POWERED ELECTRONIC DEVICES
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United States of America Patent
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app pub date -
Jun 6, 2014
filing date -
Jun 6, 2014
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Abstract
A power source switching circuit for a dual-powered electronic device can provide improved battery utilization by allowing a lower range of battery voltages to be used without causing the electronic device to reset when the device is switched from an external power source to a non-rechargeable battery power source. The power source switching circuit can prevent a transient voltage drop that can occur during such power source transitions. A comparator can control the operation of a switch that connects and disconnects the non-rechargeable battery power source to the load of the electronic device such that the system voltage provided to the load remains above a reset voltage threshold during transitions from the external power source to the non-rechargeable battery power source. Methods of providing a power source switching circuit for dual-powered electronic devices are also provided, as are other aspects.
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