Patent ID: 8284581

Claim:
An active rectifier circuit comprising: (a) a first transistor having a first current-carrying electrode coupled by a first input conductor to a first input voltage and a second current-carrying electrode coupled to an output conductor for conducting a rectified output voltage, and a second transistor having a first current-carrying electrode coupled by a second input conductor to a second input voltage and a second current-carrying electrode coupled to the output conductor; (b) a first amplifier having a first input coupled to the first input conductor, a second input coupled to the output conductor, and an output coupled to a gate of the first transistor, and a second amplifier having a first input coupled to the second input conductor, a second input coupled to the output conductor, and an output coupled to a gate of the second transistor; (c) a third transistor having a first current-carrying electrode coupled to a first reference voltage, a second current-carrying electrode coupled to the first input conductor, and a gate coupled to the output of the second amplifier, and a fourth transistor having a first current-carrying electrode coupled to the first reference voltage, a second current-carrying electrode coupled to the second input conductor, and a gate coupled to the output of the first amplifier; and (d) the first and second amplifiers each having an input offset voltage to limit or prevent backflow of current from the output conductor to either of the first and second input conductors when either of the first and second input voltages, respectively, is nearly equal to the output voltage.