Did You Know...
...that power steering was invented by independent inventor Francis W. Davis? As chief engineer in the 1920s of the truck division of the Pierce Arrow Motor Car Company, he saw how hard it was to steer heavy vehicles. So that he would be able to keep the profits from his future invention, Davis left his job, rented a small engineering shop in Waltham, Mass., and developed a hydraulic power steering system that led to power steering.
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| Number | Title | Issue Date |
| 8045344 | Regulating output current from a primary side power converter by clamping an error signal An inductor current flows through an inductor of a flyback converter. In a constant voltage mode, the pulse width of an inductor switch control signal is adjusted to maintain a constant output voltage of the flyback converter. The inductor switch control signal cont... | 10/25/2011 |
| 7358711 | Adaptive control loop A digital controller for controlling a regulated output of an output regulator. The output regulator responsive to a pulse width signal for controlling the transfer of energy between an input source and the regulated output. The digital controller including a duty c... | 04/15/2008 |
| 7334141 | Method of saving energy in an information handling system by controlling a main converter based on the amount of power drawn by the system An information handling system having an energy saving power converter that comprises a main converter for supplying power to the information handling system when in active operation, and an auxiliary converter for supplying standby power to the information handling... | 02/19/2008 |
| 7324359 | Circuit for converting alternating voltage into high-voltage direct voltage A converter circuit for a wind power system for supplying a high-voltage direct voltage connection. The system includes a transformer with one primary winding per phase and a plurality of secondary windings per phase. Three of these secondary windings of different p... | 01/29/2008 |
| 7145786 | Point of load sine amplitude converters and methods In a preferred embodiment, a Sine Amplitude Converter (“SAC”) method and apparatus for VTMs converts a DC input voltage to a DC output voltage using a fixed transformation ratio at a frequency locked to a resonance. The SAC uses a resonant circuit including a tr... | 12/05/2006 |
| 7072196 | Multi-stage high voltage solid state switch A method for triggering a high voltage solid state switch comprised of a set of thyristors connected in series. Initiating switch turn-on requires command triggering of only the lowest voltage thyristor, thereby eliminating the need for expensive high voltage pulse ... | 07/04/2006 |
| 7047110 | Method and apparatus for controlling a power supply A method for controlling a power supply, the method comprising: forming a front-end to the power supply, the front-end comprising a plurality of digital-to-analog circuits under control of a controller; and programming the controller to control the digital-to-analog... | 05/16/2006 |
| 7023192 | Output regulator system and method An output regulator to convert an input voltage to a regulated output. The output regulator including a power stage to generate a power output from the input voltage. An output filter to filter the power output to generate the regulated output. An output sensor to g... | 04/04/2006 |
| 6979988 | Duty cycle estimation A duty cycle estimator for determining a nominal duty cycle of an output regulator. The duty cycle estimator having at least two modes and including at least a mode one estimator and a mode two estimator. The mode one estimator to determine the nominal duty cycle as... | 12/27/2005 |
| 6980450 | High power density inverter and components thereof A compact high-power pure-sinewave inverter amenable to mass manufacturing techniques. Methods for increasing the power rating, power density and/or power conversion efficiency of a sinewave-modulated pulse-width-modulated (PWM) inverter having a either half-bridge ... | 12/27/2005 |
| 6977492 | Output regulator A control system for controlling an output regulator having a regulated output. The control system including an output sensor to generate a digital sense signal to indicate within which of at least three reference ranges the regulated output is included. Each of the... | 12/20/2005 |
| 6975098 | Factorized power architecture with point of load sine amplitude converters A Factorized Power Architecture (“FPA”) method and apparatus for supplying power to highly transient loads such as microprocessors includes a front end power regulator (“PRM) which provides a controlled DC bus voltage which is converted to the desired load vol... | 12/13/2005 |
| 6933711 | Voltage slicer and method A circuit for generating a feedback signal corresponding to a regulated output. The circuit including a reference generator to generate at least two reference levels, the reference levels to define at least three reference ranges. A comparator to compare the regulat... | 08/23/2005 |
| 6934166 | Output resistance modulation in power converters Modulation control circuitry modulates the equivalent output resistance of a power converter, for example a Sine Amplitude Converter, by varying the ON resistance of the primary switches in the converter. The modulation control circuitry may be used to “soft-start... | 08/23/2005 |
| 6930893 | Factorized power architecture with point of load sine amplitude converters A Factorized Power Architecture (“FPA”) includes a power regulator providing controlled DC bus voltages distributed and converted to load voltages, at the load, using DC voltage transformation modules (“VTMs”) having fixed transformation ratios. Optional fee... | 08/16/2005 |
| 6930897 | Fuel cell inverter The invention is directed to a method, system and device for converting direct current (DC) electrical voltage from a fuel cell to an alternating current (AC) voltage. The inventive method regulates power drawn from the fuel cell and from a battery to maintain a sub... | 08/16/2005 |
| 6563723 | Fault tolerant power supply circuit A fault current tolerant power supply circuit having a dc power source and switching devices for inverting dc current from the source into ac load current includes a protective circuit for protecting the switching devices from overvoltage conditions when ... | 05/13/2003 |
| 5539631 | Converter circuits using a silicon controlled rectifier A voltage converter circuit uses a silicon-controlled rectifier for converting input voltage to selected levels of output voltage. The silicon-controlled rectifier is connected in a circuit including a capacitor which oscillates between charging and disch... | 07/23/1996 |
| 5341283 | Protective circuit with feedback capability for two-point and three-point inverters, and method of feeding back the protective-circuit energy In a two-point or three-point inverter, a feedback circuitry is provided, which is disposed in parallel with a feedback capacitor (CR), and essentially include a semiconductor valve (SR) and a transformer (TR). As a result of switching the semiconductor v... | 08/23/1994 |
| 5243163 | Electrical supply circuit for a load such as a magnetron Supply circuit adapted to supply a magnetron (1) and comprising a high loss inductive voltage increasing transformer (8) whose primary winding (13) is mounted in series with a commutation element (14) adapted to chop the voltage and whose secondary windin... | 09/07/1993 |
| 5189602 | High-voltage generator with selective half-bridge and full-bridge operation An assembly is made enabling an inverter of a high-voltage generator to pass from a full-bridge use to a half-bridge use, in replacing a connection circuit of a mid-point of a first rectifier of this generator at a mid-point of the inverter by a circuit t... | 02/23/1993 |
| 5121314 | Bi-mode high voltage resonant power supply and method A capacitor-charging series resonant mode, high voltage power supply (SRMPS) (10) includes a switching network (30) that alternately applies a positive and negative voltage to a series resonant circuit, comprising a resonant capacitor and inductor. The in... | 06/09/1992 |
| 5121315 | D.C.-A.C. power converter with multiple conversions A power converter apparatus for an electric train, including at least a first modular power converter unit having a main circuit formed of switch for interrupting power from a D.C. power source, a first D.C.-A.C. power converter connected to the switch, a... | 06/09/1992 |
| 5003141 | Magnetron power supply with indirect sensing of magnetron current A magnetron (M) serving as the microwave source in a microwave oven is driven by a Switch Mode Power Supply (SMPS). The resonance circuit of the Power Supply contains a transformer (Tr), the secondary side of which is connected to the magnetron via a volt... | 03/26/1991 |
| 5001618 | Ripple insensitivity method for regulating the voltage of a voltage signal A direct-current high voltage obtained by rippling, stepping-up and rectification of a direct-current low voltage is regulated in such a manner as to ensure that the maximum value of direct-current high voltage attains a predetermined peak value at each r... | 03/19/1991 |
| 4949233 | Power supply circuit in microwave ovens A power supply circuit for a high-frequency source (M) in a microwave oven includes a switched-mode-power-supply unit having a resonant circuit which contains a coil (L2) and a controllable switch (D1). The switching of the controllable switch is controll... | 08/14/1990 |
| 4916590 | Series resonant magnetic amplifier power supply A series resonant power supply is switched at a constant frequency above the audio range, in which a magnetic amplifier is used to control the magnitude of the output voltage. It can be run silently, while providing high power at relatively low cost. The ... | 04/10/1990 |
| 4855893 | Apparatus for the low-loss wiring of the semiconductor switching elements of a three-level inverter Low-loss external wiring, for the switching-off relief of the semiconductor switching elements in a stage of a three-level inverter provides a switching-off relief capacitor which is connected to the stage output. Wiring capacitors are coupled to each of ... | 08/08/1989 |
| 4811188 | Series inverter with shunted transformer for regulation of capacitor charging A series inverter, high voltage capacitor charging circuit includes current sensors for sensing the current through each SCR in the circuit. The sensed current is used to vary the gating frequency of the SCRs and to preclude firing of an SCR until the oth... | 03/07/1989 |
| 4797908 | Voltage-resonance type power supply circuit for X-ray tube A power supply circuit of voltage resonance type for supplying a high DC voltage to an X-ray tube includes a transformer, a capacitor for forming a resonance circuit in cooperation with a primary winding of the transformer, and a rectifier circuit coupled... | 01/10/1989 |
| 4780804 | Method and an arrangement for enabling the magnetizing current passing through a transformer to be minimized when an asymmetric load is applied to the secondary side of the transformer The invention relates to a method and to an arrangement for controlling the respective conduction times of two directionally opposed electrical devices (9,10) which are mutually connected in parallel and permit current to pass therethrough solely in one d... | 10/25/1988 |
| 4779182 | Power supply for an electrostatic filter In order to scrub a waste gas, for example, of foreign matter by means of an electrostatic filter, a power supply is provided which contains a converter whose output feeds the primary winding of a high-voltage transformer. The secondary winding is connect... | 10/18/1988 |
| 4777576 | Energy converter with series resonant bridge and switching circuit An energy converter of the type utilizing a series-resonant bridge circuit (1) containing at least two thyristors (6A, 7A, 6B, 7B) with diodes (8A, 9A, 8B, 9B) antiparallel connected thereto, a high-frequency output transformer (12), and an energy buffer ... | 10/11/1988 |
| 4769754 | Stabilized welding power source including a series-resonant current-regulated converter using a transformer having an air-gapped core A pulse arc welding power supply incorporating one or more series resonant converters (SRC) for converting D.C. power to A.C. power which is then rectified to supply welding current. Each series resonant converter includes a series resonant tank circuit c... | 09/06/1988 |
| 4752866 | Ozonator power supply employing a current source inverter A versatile current source inverter power supply for an ozonator in which a gating control circuit controls the gating of a thyristor bridge inverter power supply in a manner in which the output current to the ozonator is controlled and regulated. The cur... | 06/21/1988 |
| 4725938 | High voltage resonant DC/DC converter A high voltage DC/DC converter including a voltage resonance switching circuit formed by a coreless transformer, a GTO thyristor switching element connected between the primary winding of the transformer and a D.C. source, and a voltage resonance capacito... | 02/16/1988 |
| 4710860 | Ripple-free DC high voltage generating apparatus for X-ray tube A bridge inverter arrangement for use with high-voltage generators for X-ray apparatus includes a single phase transformer having primary and secondary windings, a capacitor series-connected via a current-limiting resistor to the primary winding so as to ... | 12/01/1987 |
| 4700372 | X-ray generating apparatus An X-ray generating apparatus is adapted to obtain an X-ray tube voltage by rectifying an incoming AC voltage to obtain a DC voltage, supplying the DC voltage, after being switched through a switching section, in a predetermined cycle to a resonance circu... | 10/13/1987 |
| 4661896 | High voltage power supply system including inverter controller A high voltage power supply system includes a DC-to-DC converter for producing a DC low voltage, a DC-to-AC inverter connected to a step-up transformer for producing an AC high voltage by transforming an AC low voltage obtained from the DC low voltage, an... | 04/28/1987 |
| 4653082 | High voltage generating device for X-ray apparatus A high voltage generating device for an X-ray apparatus includes a DC output voltage control device for rectifying and smoothing a commercial AC power source voltage and a resonant circuit comprised of a series circuit of a capacitor and a primary winding... | 03/24/1987 |
