Method and apparatus for generator control
First Claim
1. A generator control circuit comprising:
- a first circuit monitoring a generator voltage and producing a first output when the voltage is below a first level;
a second circuit monitoring a generator current change rate and producing a second output when the current change rate is above a second level; and
a third circuit operatively connected to said first circuit and said second circuit for decreasing a power level supplied to the generator when a plurality of conditions are satisfied, said plurality of conditions including said voltage being below the first level and the current change rate being above the second level.
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Accused Products
Abstract
A generator control circuit is disclosed that includes a first circuit (40) monitoring a generator voltage and producing a first output when the voltage is below a first level, a second circuit (48) monitoring a generator current change rate and producing a second output when the current change rate is above a second level, and a third circuit (13, 28) operatively connected to the first circuit (40) and the second circuit (48) for decreasing a power level supplied to the generator when a plurality of conditions are satisfied, the plurality of conditions including the voltage being below the first level and the current change rate being above the second level. A method of controlling a generator is also disclosed.
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Citations
19 Claims
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1. A generator control circuit comprising:
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a first circuit monitoring a generator voltage and producing a first output when the voltage is below a first level; a second circuit monitoring a generator current change rate and producing a second output when the current change rate is above a second level; and a third circuit operatively connected to said first circuit and said second circuit for decreasing a power level supplied to the generator when a plurality of conditions are satisfied, said plurality of conditions including said voltage being below the first level and the current change rate being above the second level. - View Dependent Claims (2, 3)
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4. A method of protecting a generator comprising the steps of:
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detecting a generator voltage; detecting a rate of generator current change; and reducing the generator output when a plurality of conditions are satisfied, the plurality of condition including the generator voltage being below a first level and the rate of generator current change being above a second level. - View Dependent Claims (5)
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6. A method of protecting a generator having a field winding connected to a power supply comprising the steps of:
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detecting a generator voltage v; detecting a generator current i; differentiating the generator current i to obtain a quantity di/dt; making a number of determinations including a first determination whether v is less than a first value and a second determination whether di/dt is greater than a second value; and if each of the number of determinations is true, reducing a level of power supplied to the generator. - View Dependent Claims (7, 8, 9, 10, 11, 12, 13)
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14. A control circuit for a generator having a field winding and an output comprising:
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a field transistor having a gate connected between the generator field winding and a ground; a field controller connected to the field transistor gate for controlling current flow through the field winding; a detector for determining a generator output voltage and a current change rate in a generator current and producing a first output signal when the voltage is less than a first level and a second output signal when the current change rate is above a second level; and a generator controller operatively connected to said detector, said generator controller decreasing current flow through said generator field winding upon receipt of said first output signal and said second output signal. - View Dependent Claims (15, 16, 17, 18, 19)
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Specification