Hamilton Sundstrand Corporation

Sundstrand Corporation

Michael J Hanson

Gregory I Rozman

Albert L Markunas

Vijay K Maddali

Vietson M Nguyen

John A Dickey

Alexander Cook

Frank Z Feng

Robert C Cooney

Donald G Kilroy

Josef Maier

Malcolm J McArthur

Christian Miller

Leland E Weber

Daniel Knope

Josh C Swenson

Paul E Nuechterlein

Frank J Ludicky

Terrence R Leibham

James A Shippling

Mario R Rinaldi

Kenneth R Carr

Matt Earing

Scott R Myers

Dave Reiter

Ronald G Knight

Darren Krakowski

A capacitor pre-charge circuit configured to avoid inrush to a capacitor can include a plurality of components configured to ramp a pre-charge voltage over time up to a voltage maximum such that the a pre-charge voltage-over-time curve is not an asymptote. The plurality of components can be configured to linearly ramp voltage, for example, to the voltage maximum. In certain embodiments, the circuit can include an integrated voltage sense circuit.

Capacitor pre-charging circuits

A regenerative load system includes a voltage input and a load current regulator electrically connected to the voltage input. The system includes a fly back rectifier electrically connected to the load current regulator. A current output is electrically connected to the fly back rectifier. A system for regeneratively testing electrically powered equipment includes a power source. The system includes a unit under test (UUT) having a voltage input electrically connected to the power source, a regenerative load system electrically connected to the UUT. The regenerative load system (RLS) includes a RLS voltage input electrically connected to the UUT, a load current regulator electrically connected to the RLS voltage input, a fly back rectifier electrically connected to the load current regulator, and a current output electrically connected to the fly back rectifier. The current output is configured and adapted to provide current the UUT and/or the power source.

Regenerative load bank systems and methods

A power converter monitor having built-in fault tolerance and containment including a plurality of voltage inputs operatively connected to a pulse timing device, a respective comparator electrically connected to each of the voltage inputs, an and-gate electrically connected in series to each of the comparators and wherein the pulse timing device is operatively connected by the and-gate and a-not gate to each of the voltage inputs configured to reset a detected voltage output fault and provide a converter inhibit pulse if the voltage output fault is detected.

Power converter monitor and method of use

A dongle for connecting a computerized device to a certified unit under test (UUT) includes a computerized device communication port and a UUT communication port. The dongle also includes a communication module operatively connecting the computerized device communication port and the UUT communication port. The communication module includes an internet protocol (IP) module that supplies an IP address to a computerized device connected to the computerized device communication port, wherein the IP address enables the computerized device to receive signals from and/or send signals to the UUT.

Smart test link dongle

A dual active bridge system can include a plurality of dual active bridges (DABs). Each DAB can have a first side connected in parallel and a second side connected in parallel such that each of the plurality of DABs share a common first side capacitor and a common second side capacitor. The plurality of DABs can be configured to be operated to reduce or eliminate ripple current at the first side capacitor and/or second side capacitor.

Dual active bridge systems for ripple cancelation

An assembly for an aircraft according to an example of the present disclosure includes, among other things, a control module including a processor and a local memory that stores a first instance of operational software executable by the processor and that relates to functionality of the control module to selectively control a vehicle system, and a backplane memory device coupled to the control module by a common backplane. The backplane memory device includes shadow memory that stores a second instance of the operational software. A method of synchronizing an assembly is also disclosed.

Software version synchronization for avionics systems

A regenerative direct current (DC) load includes an input circuit, an output circuit, a low pass filter circuit, and a current regulating circuit. The input circuit is configured to receive electrical power. The output circuit is configured to provide electrical power. The low pass filter circuit is electrically coupled to the output in series. The current regulating circuit is configured to regulate a current of the electrical power. The current regulating circuit is electrically coupled to the input. The current regulating circuit includes a first switch, and a first control circuit. The first switch is electrically coupled between the input circuit and ground. The first control circuit is configured to sense the current and adjust a cycle duration and/or duty cycle of the first switch based upon the sensed current.

Feed-referenced regenerative DC load

A system and method to manage a single event latched (SEL) condition, the method including operations to monitor, for a predetermined condition associated with single event latched (SEL) states, a reset signal output from a watchdog device to a microprocessor, wherein the reset signal is responsive to a malfunction condition associated with the microprocessor. The method further includes operations to control provision of power to the microprocessor in response to detection of the predetermined condition.

System and method for managing single event latched (SEL) conditions

A fault-tolerant synchronisation source for excitation control of a three-phase generator system that combines point of regulation (POR) signals representing parameters comprising voltage and current for each phase at the POR to generate a fault-tolerant synchronisation signal.

Fault tolerant synchronisation source for excitation control of a three phase power generating system

A lug with relatively small resistance is provided that allows current to be determined between a source and a load by measuring the voltage drop across the lug. The voltage drop is sufficient to be above the electronic noise, and yet the resistance of the lug is low enough so that the heat produced by current flow is small compared with the heat generated by the source. The material comprising the lug is of a type and strength to be readily manufactured, and its resistivity varies by a relatively small amount with temperature.

Connecting lug used as a current-sense resistor

A motor generator system in accordance with the invention includes a prime mover (21) for driving an output shaft (18); a main motor generator (16, 105), having a rotor driven by the output shaft, for producing electrical power on a plurality of stator phase windings (36a-36c) in response to the prime mover rotating the output shaft and for driving the output shaft in response to operation as a motor, an exciter (14, 102), having a rotor driven by the output shaft, for applying excitation to a field winding (34) of the main motor generator during operation for producing electrical power on the plurality of phase windings and for applying current to the field winding of the main motor generator to produce a magnetic field in the field winding during operation of the main motor generator as a motor, a time varying signal source (200) for applying a time varying signal having a fundamental frequency 202 to a field winding (28) of the exciter, a main inverter (114), responsive to signal (302) representing a rotary position of the rotor of the main motor generator, for commutating application of current to the at least one of the plurality of phase windings to control operation of the main motor generator during operation as a motor while simultaneously maintaining one of the plurality of phase windings in a non-commutated stated in which no current is cause to flow therein by the main inverter, circuitry (300), coupled to the stator phase winding maintained in the non-commutated state, for detecting an amplitude modulation of voltage across the non-commutated phase winding at twice the fundamental frequency representing the rotary position of the rotor of the main motor generator and producing the rotor position signal in response to the detected amplitude modulation to control commutation of current in at least one of the plurality of stator phase windings.

Position control using variable exciter feed through

A motor generator system (120) in accordance with the invention includes a prime mover (21) for driving an output shaft (18), a main motor generator (105), having a rotor driven by the output shaft, for producing electrical power on at least one output winding (36a-36c) in response to the prime mover rotating the output shaft and for driving the output shaft in response to operation as a motor; an exciter (102) for applying excitation to a field winding (34) of the main motor generator during operation for producing electrical power on the at least one output winding and for applying current to the field winding of the main motor and generator to produce a magnetic field in the field winding during operation of the main motor generator as a motor; circuitry (122), responsive to current in a field winding (204) of the exciter, for producing an output signal representing a position of the rotor of the main motor generator driven by the output shaft; and a main inverter (114), responsive to the output signal, for commutating application of electrical current to the at least one output winding to control operation of the main motor generator during operation as a motor.

Position and velocity sensorless control for a motor generator system

A digital voltage regulator for an electrical power system including a permanent magnet generator (PMG), an exciter, and a main generator. A controller multiplies the frequency of the generator output voltage by a predetermined value to provide a sampling signal having the multiplied frequency and synchronized with the generator output voltage. The controller also provides a sawtooth voltage signal having a repetition rate equal to the frequency of the sampling signal and an incrementing rate determined by the system clock signal. The generator output voltage is sampled at the frequency of the sampling signal. When the difference between the sampled signal and a reference voltage is greater than the sawtooth voltage, the PMG voltage is switched to provide voltage for the exciter field winding.

Voltage regulator for an electrical power system

A detector for detecting rotor position of a brushless generator having a motive power shaft, a permanent magnet generator (PMG) having a set of armature phase windings and a main generator portion having a set of armature phase windings includes a circuit coupled to the armature phase windings of the PMG for deriving a number of interval pulses per revolution of the motive power shaft. A circuit measures time periods between adjacent interval pulses and the measured time periods are converted into an indication of the angular position of the motive power shaft in accordance with a parameter of power delivered to one of the main generator portion armature phase windings.

Control for a brushless generator operable in generating and starting

A detector for detecting rotor position of a brushless generator having a motive power shaft, a permanent magnet generator (PMG) having a set of armature phase windings and a main generator portion having a set of armature phase windings includes a circuit coupled to the armature phase windings of the main generator portion for deriving a number of interval pulses per revolution of the motive power shaft. A circuit measures time periods between adjacent interval pulses and the measured time periods are converted into an indication of the angular position of the motive power shaft in accordance with a parameter of power delivered to the main generator portion armature phase windings.

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Rockford, IL, United States of America

Michael J Hanson