Electricity: single generator systems – Automatic control of generator or driving means – Voltage of generator or circuit supplied
Reexamination Certificate
2006-11-29
2008-11-18
Schuberg, Darren (Department: 2834)
Electricity: single generator systems
Automatic control of generator or driving means
Voltage of generator or circuit supplied
C322S010000, C322S024000, C322S046000, C363S049000, C363S098000
Reexamination Certificate
active
07453241
ABSTRACT:
A feedback control method and circuit for inclusion in a control system of an electrical power generating source that comprises a free piston Stirling engine driving a linear alternator. An instantaneous value of a variable, Vinternal, is continuously derived from other sensed and computed parameters and used in a negative feedback control loop of the control system to control engine piston stroke in order to maintain the power produced by the engine equal to the power transferred from the engine to the alternator. Vinternalis the sum of the voltage induced on the alternator winding and the voltage across the equivalent circuit lumped resistance of the alternator winding and a switching mode rectifier connects the alternator winding to an energy storage capacitor or battery. A negative feedback, alternator current control loop has an output connected to the pulse width modulator of the switching mode rectifier and has a feedback circuit comprising a current sensor for sensing instantaneous alternator current. A negative feedback, Vinternalcontrol loop has a feedback circuit including a piston position or velocity sensor connected to a computing circuit that the current sensor is also connected to. The computing circuit computes a signal representing Vinternalfor use as the feedback signal of the Vinternalcontrol loop. The output of the Vinternalcontrol loop is connected as the command input to the current feedback control loop.
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Holliday Ezekiel S.
Keiter Douglas E.
Foster Frank H.
Kremblas, Foster Phillips & Pollick
Mohandesi Iraj A
Schuberg Darren
Sunpower, Inc.
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