Patent ID: 8575889
Filing Date: 2013-11-05
Classification: H02M

Abstract:
1. A DC-DC voltage down-converter for a first electronic device, the first electronic device supplied by a battery and having a bus interface for interconnection with a second electronic device capable of supplying electric power, the DC-DC voltage down-converter including: a terminal adapted to be coupled to a voltage supply line of the bus interface and operable to receive an input current from the second electronic device; an electric energy storage element coupled between the battery and the terminal, the electric energy storage element being operable to store/release electric energy; an input current feedback control circuit coupled to the terminal and arranged to monitor a value of the input current and generate a corresponding input current indication related to the value of the input current; and a drive circuit arranged to increase a rate of energy transfer from the voltage supply line to the electric energy storage element when the value of the input current increases, by controlling the storage/release of the electric energy storage element according to the input current indication, so as to cause electric power generated by the input current supplied by the second electronic device through the voltage supply line to re-charge the battery.