Apparatus and method for comparing output signals indicative of engine rotational speed and/or generator rotational speed
First Claim
1. An apparatus adapted to compare a pair of speed-indicative signals indicative of engine rotational speed or indicative of generator rotational speed, comprising:
- an input port for electrical connection to a positive voltage output from a rectifier of a generator;
speed signal circuitry connected to the input port and adapted to convert rippling in said positive voltage output into a speed-indicative signal indicative of engine rotational speed or indicative of generator rotational speed;
an output port connected to said circuitry and adapted to apply said speed-indicative signal to a comparator; and
a means for providing a voltage signal indicative of a voltage across a rectifier bridge of an alternator, said voltage signal being received by said comparator.
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Accused Products
Abstract
An apparatus and method are provided to deliver a pair of output signals indicative of engine rotational speed and/or generator rotational speed. The signals are compared to each in order to determine if a generator is operating properly. At least one output signal is delivered to, or developed internally and used by, a voltage regulator of the generator. One output signal is generated based on a ripple on a positive voltage input to the voltage regulator from a generator. The other signal is indicative of the voltage at the rectifier bridge.
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Citations
25 Claims
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1. An apparatus adapted to compare a pair of speed-indicative signals indicative of engine rotational speed or indicative of generator rotational speed, comprising:
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an input port for electrical connection to a positive voltage output from a rectifier of a generator;
speed signal circuitry connected to the input port and adapted to convert rippling in said positive voltage output into a speed-indicative signal indicative of engine rotational speed or indicative of generator rotational speed;
an output port connected to said circuitry and adapted to apply said speed-indicative signal to a comparator; and
a means for providing a voltage signal indicative of a voltage across a rectifier bridge of an alternator, said voltage signal being received by said comparator. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method for providing a signal indicative of an alternator operation, comprising:
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determining a first speed-indicative signal indicative of engine rotational speed or indicative of generator rotational speed by detecting rippling in a positive voltage output from a rectifier of a generator, converting said rippling in said positive voltage output into a speed-indicative signal indicative of engine rotational speed or indicative of generator rotational speed;
comparing said first speed-indicative signal to a voltage signal across said rectifier; and
providing a comparative output signal corresponding to the difference between said first speed-indicative signal and said voltage signal. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25)
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Specification