Voltage regulator with independent peak and average voltage sensing
First Claim
1. A voltage regulator for a generating system having a main generator and an exciter for providing field current to the main generator, comprising:
- means coupled to the main generator for sensing first and second operating parameters thereof;
means coupled to the sensing means for generating first and second pulse width modulated (PWM) signals based upon the first and second sensed operating parameters, respectively;
means coupled to the generating means for comparing the first and second PWM signals and passing only that PWM signal having the narrower pulse width; and
means responsive to said passed PWM signal for controlling the exciter to in turn regulate the output of the main generator.
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Accused Products
Abstract
A voltage regulator for a generating system having a main generator and an exciter for providing field current to the main generator includes means coupled to the main generator for sensing at least two operating parameters thereof. Means are coupled to the sensing means for generating pulse width modulated (PWM) signals based upon the first and second sensed operating parameters. Means are coupled to the first and second PWM signals for comparing the pulse widths thereof. The PWM signal having the narrower pulse width is coupled to a switch for controlling the current delivered to the exciter. The exciter current is therefore controlled in accordance with one of the sensed parameters at any particular time.
35 Citations
14 Claims
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1. A voltage regulator for a generating system having a main generator and an exciter for providing field current to the main generator, comprising:
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means coupled to the main generator for sensing first and second operating parameters thereof; means coupled to the sensing means for generating first and second pulse width modulated (PWM) signals based upon the first and second sensed operating parameters, respectively; means coupled to the generating means for comparing the first and second PWM signals and passing only that PWM signal having the narrower pulse width; and means responsive to said passed PWM signal for controlling the exciter to in turn regulate the output of the main generator. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A voltage regulator for a generating system having a main generator and an exciter for providing field current to the main generator, comprising:
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first means for developing a first signal representing a first parameter of the output voltage of the main generator; second means for developing a second signal representing a second parameter of the output voltage of the main generator; means for converting the first and second signals into first and second pulse width modulated (PWM) signals each having a pulse width dependent upon the level of the respective first or second signal relative to a reference; and means responsive to only one of the PWM signals at any time for controlling the exciter to in turn regulate the output of the main generator. - View Dependent Claims (8, 9, 10, 11)
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12. A voltage regulator for a brushless alternator having a main generator which develops three phase output power, an exciter for providing field current to a field winding of the main generator and a permanent magnet generator (PMG) for providing field current to a field winding of the exciter, comprising:
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first means for developing a first signal representing the average of the three phase output voltage of the main generator; a reference signal source for generating a reference signal; a first comparator having a first input coupled to the first developing means, a second input coupled to the reference signal source and an output which develops a first pulse width modulated (PWM) signal in accordance with the comparison of the signals at the first and second inputs; second means for developing a second signal representing the peak phase output voltage of the main generator; a second comparator having first and second inputs coupled to the second developing means and the reference signal source, respectively, and an output which develops a second PWM signal in accordance with the comparison of the signals at the inputs; an AND gate coupled to the outputs of the first and second comparators for comparing the pulse widths thereof, the AND gate passing to an output thereof the PWM signal having the narrower pulse width; and means coupled to the PMG and the field winding of the exciter for controlling the exciter field current in accordance with the passed PWM signal. - View Dependent Claims (13, 14)
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Specification