Patent ID: 7541782

Claim:
A system, comprising: a detector to detect a voltage stored in an ultracapacitor coupled to a load; and an extractor to extract energy from the ultracapacitor, the extractor including: a first amplifier circuit to amplify an output voltage from the ultracapacitor when the detected voltage falls below a first predetermined voltage; a divider to divide the amplified voltage to form a first control signal for the first amplifier circuit; and a controller to generate a second control signal to vary a ratio of the divider, the varied ratio adjusting the first control signal to maintain the output voltage of the ultracapacitor substantially equal to or above the first predetermined voltage, the first amplifier circuit to amplify the output voltage independent of coupling the ultracapacitor to a DC power source during a charging operation of the ultracapacitor and during a time when the load is to be driven based on the amplified output voltage, and wherein an operation is to be performed to prevent the first amplifier circuit from amplifying the output voltage of the ultracapacitor when the detected voltage is above the first predetermined voltage.