Regulation control for variable frequency generators
First Claim
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1. A regulator control apparatus for use with a variable frequency generator having a field winding, comprising:
- a voltage regulator supplying a low frequency drive pulse-width modulated voltage signal produced from a voltage input received from a first voltage source;
a duty cycle controller supplying a high frequency pulse-width modulated voltage signal produced from a voltage input received from a second voltage source;
an AND gate for receiving the low and high frequency pulse-width modulated voltage signals and for modulating the high frequency pulse-width modulated voltage signal with the low frequency pulse-width modulated voltage signal to produce a combined drive signal representing an average voltage signal for supply to the field winding;
a digital processor for controlling the high frequency pulse-width modulated signal; and
a load current sensor for detecting a transient load on the variable frequency generator and controlling the processor to adjust a duty cycle of the high frequency pulse-width modulated signal to produce an adjusted average voltage from the combined drive signal.
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Abstract
A variable frequency generator regulation control circuit and method for controlling open loop gain under changing generator speed conditions employing a high frequency pulse-width modulated signal with a duty cycle that is controlled such that variations in rectified PMG voltage and generator gain over the generator speed range can be compensated for. This signal is modulated by a low frequency pulse-width modulated signal provided by the generator regulator, using a logic gate to produce a combined signal representing an average voltage signal applied to a generator field winding as the generator speed fluctuates.
12 Citations
17 Claims
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1. A regulator control apparatus for use with a variable frequency generator having a field winding, comprising:
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a voltage regulator supplying a low frequency drive pulse-width modulated voltage signal produced from a voltage input received from a first voltage source; a duty cycle controller supplying a high frequency pulse-width modulated voltage signal produced from a voltage input received from a second voltage source; an AND gate for receiving the low and high frequency pulse-width modulated voltage signals and for modulating the high frequency pulse-width modulated voltage signal with the low frequency pulse-width modulated voltage signal to produce a combined drive signal representing an average voltage signal for supply to the field winding; a digital processor for controlling the high frequency pulse-width modulated signal; and a load current sensor for detecting a transient load on the variable frequency generator and controlling the processor to adjust a duty cycle of the high frequency pulse-width modulated signal to produce an adjusted average voltage from the combined drive signal. - View Dependent Claims (2, 3)
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4. A regulator control apparatus for use with a variable frequency generator having a permanent magnet generator (PMG) voltage source producing a generator speed and a PMG input, comprising:
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a voltage regulator coupled to a point of regulation supplying a drive pulse-width modulated signal; a field switch driver in connection with a field switch for controlling open loop gain on the PMG voltage source; a logic gate coupled between the voltage regulator and the field switch driver; a duty cycle controller circuit supplying a permanent magnet generator voltage pulse-width modulated signal coupled between the logic gate and the permanent magnet generator input; and
whereinthe logic gate modulates the drive pulse-width modulated signal with the permanent magnet generator voltage pulse-width modulated signal to output a combined drive signal supplied to the field switch driver, the duty cycle controller is a generator speed to duty cycle converter which receives a generator speed sensing signal from the permanent magnet generator voltage source, the permanent magnet generator voltage pulse-width modulated signal is a high frequency pulse-width modulated signal including a duty cycle, and the generator speed to duty cycle converter adjusts the duty cycle of the high frequency pulse-width modulated signal depending on the generator speed to represent an average field supply voltage signal to compensate for the increase in generator gain. - View Dependent Claims (5, 6, 7, 8, 9)
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10. A method of controlling open loop gain of a variable frequency generator with a field winding, the variable frequency generator having a voltage range and a speed range, comprising:
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determining an optimal average voltage applied to the field winding; detecting a regulator drive pulse-width modulated signal applied to the field winding; supplying a second pulse-width modulated signal from a duty cycle controller with a higher frequency than the regulator drive signal; and modulating the second pulse-width modulated signal with the regulator drive pulse-width modulated signal to produce an average voltage signal applied to the field winding approximating the optimal average voltage as voltage range and speed range of the variable frequency generator vary. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17)
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Specification