Patent ID: 8344702
Filing Date: 2013-01-01
Classification: H01M,H02J,Y02E

Abstract:
1. A universal serial bus battery, comprising: a universal serial bus (USB) interface; a charger comprising a first input terminal and a first output terminal; a battery comprising a positive electrode directly connected to the first output terminal of the charger and a negative electrode connected to ground; a comparator comparing a voltage at the universal serial bus interface and a voltage of the battery, the comparator producing a switch on signal when the voltage at the serial bus interface exceeds the voltage of the battery, the comparator further producing a switch off signal when the voltage at the universal serial bus interface does not exceed the voltage of the battery; a first switch comprising a second input terminal directly connected to the USB interface and a second output terminal directly connected to the first input terminal of the charge, and configured to establish an electrical connection between the USB interface and the charger upon receiving the switch on signal and cutting off the electrical connection upon receiving the switch off signal; a second switch comprising an input terminal electrically connected to the battery, an output terminal electrically connected to the universal serial bus interface, and a control terminal grounded via a resistor and electrically connected to the second output terminal of the first switch, the control terminal establishing an electrical connection between the universal serial bus interface and the battery when the electrical connection between the USB interface and the charger is terminated by the first switch.