Patent ID: 8525434

Claim:
A power circuit, comprising: a converter configured to receive electric energy from an energy source, and to deliver the electric energy for driving a load; a voltage feedback module configured to generate a first feedback signal based on a voltage of the delivered electric energy; a current feedback module configured to generate a second feedback signal based on a current of the delivered electric energy; a combining unit configured to take as inputs the first feedback signal and the second feedback signal, and to output a feedback signal corresponding to the first feedback signal or the second feedback signal having a higher positive voltage at an input of the combining unit, wherein the combining unit comprises: a first diode having a first anode receiving the first feedback signal and a first cathode; and a second diode having a second anode receiving the second feedback signal and a second cathode that is coupled with the first cathode to output the feedback signal corresponding to the first feedback signal or the second feedback signal having a higher positive voltage at the input of the combining unit; and a controller configured to receive the feedback signal from the combining unit and to control the converter to receive and deliver the electric energy based on the feedback signal.