Phase winding detector and alternator charging system
First Claim
1. A phase winding detector comprising:
- means for receiving a single phase output signal provided by a phase winding, said phase output signal having a magnitude;
means for periodically sampling, in accordance with oscillator pulses, the magnitude of said phase output signal and providing a sampled phase output signal in response thereto; and
means for comparing said phase output signal with said sampled phase output signal and providing an output when said phase output signal differs from said sampled phase output signal by a predetermined amount, whereby detection of variation in said phase output signal is provided.
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Accused Products
Abstract
A phase winding detector (50) is preferably used to detect alternator (11) rotation in an alternator charging system (10). The detector (50) receives a single winding phase output signal (at 39) and utilizes a sampling apparatus (71, 74, 76) to provide a sampled phase output signal (at 75). A comparison circuit (70) provides an output by comparing the phase output signal with the sampled phase output signal, whereby a detection of variation in the phase output signal is provided (at terminals 85, 87 and 51). After initial detection of variation of the phase winding output signal, preferably additional circuitry (77, 79, 83) results in comparing the phase winding signal with a fixed reference threshold (Vref). Detection of a phase winding output signal is implemented without use of a substantial DC blocking capacitor and is implemented by monitoring only one input signal terminal.
45 Citations
20 Claims
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1. A phase winding detector comprising:
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means for receiving a single phase output signal provided by a phase winding, said phase output signal having a magnitude; means for periodically sampling, in accordance with oscillator pulses, the magnitude of said phase output signal and providing a sampled phase output signal in response thereto; and means for comparing said phase output signal with said sampled phase output signal and providing an output when said phase output signal differs from said sampled phase output signal by a predetermined amount, whereby detection of variation in said phase output signal is provided. - View Dependent Claims (2, 3, 4)
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5. An alternator rotation detector comprising:
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means for receiving a single phase AC output signal provided by an alternator phase winding, said phase output signal having a magnitude; means for periodically sampling, in accordance with oscillator pulses, the magnitude of said alternator phase output signal and providing a sampled phase output signal in response thereto; and means for comparing said alternator phase output signal with said sampled phase output signal and providing an output when said alternator phase output signal differs from said sampled phase output signal by a predetermined amount, whereby detection of variation in said alternator phase output signal, and thereby detection of alternator rotation, is provided. - View Dependent Claims (6, 7, 8, 9, 10, 11)
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12. An alternator charging system including:
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a voltage regulator; and an alternator having at least one output phase winding, said alternator receiving field coil excitation from said voltage regulator, said voltage regulator including an alternator rotation detector comprising; means for receiving a single phase AC output signal, having a magnitude, from said alternator phase winding, means for periodically sampling, in accordance with oscillator pulses, the magnitude of said alternator phase output signal and providing a sampled phase output signal in response thereto, and means for comparing said alternator phase output signal with said sampled phase output signal and providing an output when said alternator phase output signal differs from said sampled phase output signal by a predetermined amount, whereby detection of variation in said alternator phase output signal, and thereby detection of alternator rotation, is provided. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20)
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Specification