Patent ID: 8829825
Filing Date: 2014-09-09
Classification: H02M

Abstract:
1. A vehicle power system comprising: an unregulated alternator; a saturable reactor receiving an output AC voltage from the alternator and generating a reduced AC voltage in response to a bias signal; and an active rectifier rectifying the reduced AC voltage to a DC voltage; wherein the active rectifier includes a circuit including: a transistor receiving the reduced AC voltage; a comparator for comparing a first voltage at a first terminal of the transistor to a second voltage at a second terminal of the transistor; and a driver coupled to the comparator, the driver turning the transistor on and off in response to a control signal from the comparator; wherein the transistor includes a source terminal coupled to an inverting input of the comparator; the comparator includes a hysteresis resistor between a comparator output terminal and a comparator non-inverting input.