Patent attributes
A self-latching power supply apparatus is disclosed. The apparatus comprises an activation transistor in electrical communication with an input voltage source and a battery-switching transistor. Voltage detection circuitry may be intermediate the input voltage source and the activation transistor. An input port may be intermediate and operably connected to the input voltage source and the activation transistor. The activation transistor is in electrical communication with a battery-switching transistor. The battery-switching transistor is connected to a battery and a power supply node for an electric device. The activation transistor may be configured to activate the battery-switching transistor, enabling voltage from the battery to be available at the power supply node for the electric device. A deactivation transistor is in communication with the battery-switching transistor, and is configured to disrupt power flow from the battery. The transistors may be bipolar junction transistors or metal-oxide semiconductor transistors. The deactivation transistor may be controlled by circuitry from the electric device, enabling the electric device to power itself down. The apparatus further comprises an electronic latch comprising the battery-switching transistor, the power supply node, and at least one of the activation transistor and the deactivation transistor.
