Method and apparatus for filtering alternator ripple using synchronous sampling.

摘要

A circuit for filtering the ripple in an output of a multi-phase alternator in a vehicle system having a regulating circuit (24) that regulates the output of the alternator includes a switch (20) connected in series between a system voltage (21) and the regulating circuit (124), and means for closing the switch at a predetermined phase of the voltage of at least one of the stator windings of the alternator. The means for closing the switch (20) operates to close the switch (20) at a conduction switchover point among the stator windings in synchronism with a voltage waveform of the at least one of the stator windings, and is timed to produce an aliased waveform for application to the regulator. The output of the switch is applied to an integrator for integrating the output voltage from the alternator during an entire time cycle period of one of the windings of the stator coils for application to the regulator. A method for filtering the ripple in an output of a multi-phase alternator in a vehicle includes providing a switch (20) in series between a system voltage (21) and a voltage regulating circuit (24) and closing the switch at a predetermined phase of the voltage of at least one of the stator windings of the alternator. <IMAGE>