H - Electricity – 02 – J
Patent
H - Electricity
02
J
320/12
H02J 7/14 (2006.01) G01R 31/00 (2006.01) G01R 31/34 (2006.01)
Patent
CA 1150351
Abstract A detector monitoring the voltage ripple in the rectified electrical output signal of an alternator in a multiphase alternator battery charging system is dis- closed. A circuit monitors the undulating alternator output signal and produces a signal level in response. To correct the detector operation for various magnetic phenomena present in the alternator, a first circuit measures the rotational speed of the rotor and produces a proportional signal. A second circuit determines the excitation current supplied to the field coil. The measurement and determination are separately weighted and combined to form a corrected comparison threshold value. A variable threshold circuit combines the signal proportional to the rotational speed of the rotor and the determined field coil excitation current to produce a combined signal level. Comparison means compare the signal level from the monitored alternator output signal with the combined signal level and produce an output sig- nal level indicative of the detection of a voltage ripple in excess of the combined signal level. The output sig- nal is corrected for the effects of significant alterna- tor performance characteristics.
375420
Mortonson Robert W.
Sievers Kirk A.
Gowling Lafleur Henderson Llp
Motorola Inc.
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