| 摘要 |
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. |
