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| Number | Title | Issue Date |
| 5992950 | Controlled stop function for locomotives A controlled stop system for an AC electric locomotive includes a braking effort control circuit responsive to a braking command regulating braking effort produced by AC traction motors coupled in driving relationship to wheels of the locomotive. The cont... | 11/30/1999 |
| 5929610 | Method and apparatus for shoot-through detection and accommodation in an electric power system including a synchronous generator power source A shoot-through protection system for an electric power generating system including a synchronous generator, a bridge rectifier coupled to an output of the generator for converting alternating current (AC) from the generator to direct current (DC) at a re... | 07/27/1999 |
| 5910709 | Florescent lamp ballast control for zero -voltage switching operation over wide input voltage range and over voltage protection A ballast system for at least one dimmable fluorescent lamp includes a resonant switching inverter and a controller which controls the inverter to operate above resonance during starting and normal running operation. After a start delay timer allows time ... | 06/08/1999 |
| 5847508 | Integrated starting and running amalgam assembly for an electrodeless fluorescent lamp An integrated starting and running amalgam assembly for an electrodeless SEF fluorescent lamp includes a wire mesh amalgam support constructed to jointly optimize positions of a starting amalgam and a running amalgam in the lamp, thereby optimizing mercur... | 12/08/1998 |
| 5826563 | Diesel engine cylinder skip firing system A high horsepower diesel engine is operated in a skip firing mode in which the engine includes a plurality of individually controllable, fuel injected cylinders. The system senses that the engine is operating in a low horsepower mode and has a low fuel de... | 10/27/1998 |
| 5773966 | Dual-mode, high-efficiency dc-dc converter useful for portable battery-operated equipment A dual-mode dc--dc converter is configured for operation at high efficiencies over a wide load range. At light loads and during equipment sleep mode, a dc--dc converter is operated in a linear regulation mode; at heavy loads, the dc--dc converter is opera... | 06/30/1998 |
| 5721746 | Optimal soft-output decoder for tail-biting trellis codes A circular MAP decoder for error-correcting trellis codes that employ tail biting produces soft-decision outputs provides an estimate of the probabilities of the states in the first stage of the trellis, which probabilities replace the a priori knowledge ... | 02/24/1998 |
| 5721745 | Parallel concatenated tail-biting convolutional code and decoder therefor A parallel concatenated convolutional coding scheme utilizes tail-biting nonrecursive systematic convolutional codes. The associated decoder iteratively utilizes circular maximum a posteriori decoding to produce hard and soft decision outputs. This encodi... | 02/24/1998 |
| 5712802 | Thermal protection of traction inverters A method for providing thermal protection for forced air cooled power electronic semiconductors without direct measurement of semiconductor temperature, the semiconductors being mounted on a heat sink over which cooling air is blown includes the steps of ... | 01/27/1998 |
| 5703441 | Multi-function filament-heater power supply for an electronic ballast for long-life dimmerable lamps A filament-heater power supply includes a combination forward and flyback power converter for supplying electronically variable, isolated voltages to dimmable discharge lamp filaments while supplying a fixed dc output voltage to a ballast control circuit.... | 12/30/1997 |
| 5701059 | Elimination of striations in fluorescent lamps driven by high-frequency ballasts A ballast system for at least one dimmable fluorescent lamp includes a ballast inverter for driving the fluorescent lamp to provide light output and a parallel impedance for coupling across the fluorescent lamp for providing an alternative path for divert... | 12/23/1997 |
| 5691625 | Using sensed stator terminal voltages for determining alternator rotor position for cranking an engine A system for determining rotor position of an n-phase alternator driven by an inverter uses as inputs the stator terminal voltages of the alternator with respect to the negative power bus, which are already also provided as inputs to the inverter, and pro... | 11/25/1997 |
| 5673627 | Window assembly for a monocoque locomotive A window assembly for a locomotive is sealingly disposed in an opening within the sidewall of the locomotive and attached to the sidewall to allow limited relative movement of the window assembly with respect to the sidewall without disrupting the seal.... | 10/07/1997 |
| 5669311 | Shuttered radiator system with control A radiator assembly for a locomotive is provided. The locomotive has an engine for driving the locomotive and a cooling water system for circulating cooling water through the engine to operatively control the temperature of the engine, the assembly includ... | 09/23/1997 |
| 5661378 | Tractive effort control method and system for recovery from a wheel slip condition in a diesel-electric traction vehicle A wheel slip recovery method for a locomotive in which an internal combustion engine is connected in driving relationship to an electric power generator to supply electric power to a plurality of electric traction motors coupled to drive corresponding whe... | 08/26/1997 |
| 5646510 | AC locomotive operation with DC bus current sensor failure A control system for an AC diesel electric locomotive allowing for continued operation of the locomotive even in the instance of failure of current sensors providing current feedback information. The system is coupled to a plurality of DC to AC inverters ... | 07/08/1997 |
| 5629584 | Accurate placement and retention of an amalgam in a electrodeless fluorescent lamp An amalgam is accurately placed and retained in an optimized location in the exhaust tube of an electrodeless SEF lamp for operation at a mercury vapor pressure in the optimum range from approximately four to seven millitorr by forming a dimple in the exh... | 05/13/1997 |
| 5629567 | Speed control system for an AC locomotive A speed control system for an AC electric locomotive of the type having a plurality of wheel-axle sets with each wheel-axle set being coupled to an independently controllable AC electric traction motor and each motor having a corresponding speed sensor, e... | 05/13/1997 |
| 5613444 | Self-steering railway truck A railway truck includes a frame having a pair of side frames and laterally extending transoms therebetween. A plurality of journal boxes are resiliently suspended from the side frames and support a pair of longitudinally spaced apart end axles extending ... | 03/25/1997 |
| 5609946 | High frequency, high density, low profile, magnetic circuit components A high frequency, high density, low profile magnetic circuit component includes a magnetic core having a first magnetic layer and a second magnetic layer with a conductive layer deposited therebetween, each magnetic layer being a multilayer structure comp... | 03/11/1997 |
| 5608771 | Contactless power transfer system for a rotational load Power is transferred from a stationary power supply to a rotational gantry in a computer tomography (CT) system through a rotary transformer arranged in a ring configuration with an inner diameter that is sufficiently large to receive a patient. The rotar... | 03/04/1997 |
| 5600187 | Electronically controllable capacitors using power MOSFET's An electrically controllable variable capacitor includes the interelectrode capacitance of at least one power MOSFET, a capacitance connected in series with the MOSFET and having one terminal connected to the drain or source thereof (the series capacitanc... | 02/04/1997 |
| 5594629 | High-frequency switching circuits operable in a natural zero-voltage switching mode A dc-to-dc power converter, comprising a transformer, a single primary-side power switching device and a parallel combination of a diode and a capacitance, is controlled to operate in a "natural" zero-voltage switching mode such that the power switching d... | 01/14/1997 |
| 5577449 | Bulkhead assembly for a monocoque locomotive A locomotive assembly having a longitudinally extending platform and attached sidewalls with a frontal nosepiece extending about a front portion of the platform. The locomotive having a connection device for connecting components to hollow supports in the... | 11/26/1996 |
| 5576940 | Front-end power converter for distributed power systems A front end converter for interfacing prime power to a lower voltage distribution bus, e.g., Vdc, in a distributed power system has a natural droop characteristic which emulates a series resistor, but without associated losses. With this droop characteris... | 11/19/1996 |
| 5570074 | Very low leakage inductance, single-laminate transformer A transformer having a very low, predetermined leakage inductance includes an elongate dielectric laminate having two surfaces. A primary winding having a pattern conformal to the configuration of the laminate is disposed on one surface and extends substa... | 10/29/1996 |
| 5568368 | Square-wave converters with soft voltage transitions for ac power distribution systems A converter for an ac power distribution system provides a square-wave voltage of low output impedance to an ac power distribution bus for driving a plurality of loads, each load including a rectifier and an input filter capacitor. Slew-rate limiting capa... | 10/22/1996 |
| 5566745 | Shuttered radiator system with control A radiator assembly for a locomotive is provided. The locomotive has an engine for driving the locomotive and a cooling water system for circulating cooling water through the engine to operatively control the temperature of the engine, the assembly includ... | 10/22/1996 |
| 5559704 | Method to compute horsepower required by an internal combustion engine coupled to an auxiliary alternator A method for determining gross engine horsepower of an internal combustion engine coupled in driving relationship to an alternating current electric alternator, the alternator supplying electric power to variable loads, comprises measuring the field curre... | 09/24/1996 |
| 5559392 | Apparatus for securing an amalgam at the apex of an electrodeless fluorescent lamp A first portion of a spiral wire support for an amalgam is securely fitted into an exhaust tube formed in a re-entrant cavity of an electrodeless fluorescent lamp before attachment and sealing of the re-entrant cavity to the bulb of the lamp. A second por... | 09/24/1996 |
| 5546294 | Resonant converter with wide load range Low-power auxiliary circuitry is added to a resonant converter for providing high efficiency operation, low EMI, and tight output voltage control over a wide load range. There is an auxiliary circuit corresponding to each half-bridge connection of main sw... | 08/13/1996 |
| 5544486 | Dual outlet turbocharger and twin aftercoolers for a diesel engine A retrofit turbocharger and aftercoolers for a diesel engine (suitable for a locomotive application) are able to supply the intake air for the engine more efficiently and effectively so as to provide a significant improvement in operating efficiency for t... | 08/13/1996 |
| 5535680 | Monocoque locomotive A locomotive assembly having a longitudinally extending platform and attached sidewalls with a frontal nosepiece extending about a front portion of the platform. The locomotive having a connection device for connecting components to hollow supports in the... | 07/16/1996 |
| 5528486 | Firing pattern output generation for AC traction inverter control A method and apparatus for generating gating signals for each of a plurality of electric switching devices in electric power conversion circuit includes a microcomputer for computing timing data representative of a relative time for application of gating ... | 06/18/1996 |
| 5525941 | Magnetic and electromagnetic circuit components having embedded magnetic material in a high density interconnect structure A magnetic or electromagnetic circuit component includes an embedded magnetic material (e.g., ferromagnetic) in an HDI structure with alternating dielectric and metal or winding layers. In one embodiment, the ferromagnetic material is situated in a substr... | 06/11/1996 |
| 5525769 | Inverter cut-out switch An inverter contact switch has a first pair of spaced fixed contacts connected to respective terminals of an inverter circuit for selectively disconnecting and connecting the inverter to a DC power bus. A first pair of spaced movable contacts are position... | 06/11/1996 |
| 5521593 | Method and apparatus for monitoring operating characteristics of semiconductor electric power switching circuits A monitoring system for an electrical power control system having a plurality of electrical components operable in electrically conductive and non-conductive states in response to command signals from a system controller. The controller is connected for r... | 05/28/1996 |
| 5517093 | Braking grid isolation for locomotive traction motor control system A locomotive traction motor control system includes a traction motor to propel a locomotive when it motors, and to slow the locomotive when it engages dynamic braking. A resistive element dissipates electrical energy generated during dynamic braking. A co... | 05/14/1996 |
| 5517086 | Modified valley fill high power factor correction ballast A modified valley fill circuit, including a main ballasting inductor for supplying an electrolytic capacitor, has an additional charging winding on the main ballasting inductor for charging the electrolytic capacitor to a predetermined voltage which maxim... | 05/14/1996 |
| 5514921 | Lossless gate drivers for high-frequency PWM switching cells A gate driver circuit, including either a full-bridge or a half-bridge configuration of gate drive switching devices, is capable of applying gate drive signals of variable pulse widths in a substantially loss,less manner to power switching devices of a hi... | 05/07/1996 |
