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| Number | Title | Issue Date |
| 7271572 | Apparatus and methods for providing a voltage adjustment for single-phase voltage regulator operation in a three-phase power system Provided is an apparatus and method for providing a voltage reduction for single-phase voltage regulator operation in a three-phase power system. The voltage regulator includes a plurality of tap positions selectable to adjust a voltage at a load to an in-band area.... | 09/18/2007 |
| 7248994 | Digital method and apparatus for sensing position with a linear variable differential transformer An apparatus and method for determining a linear position from a linear variable differential transformer (LVDT) including a primary coil driven by an excitation signal, and two secondary coils coupled to two correlated signals. The method includes converting the co... | 07/24/2007 |
| 7205916 | Digital method and apparatus for resolving shaft position An apparatus and method for determining an angular position of a shaft are disclosed, which comprise resolving an excitation signal at an excitation frequency into at least two orthogonal signals, converting the orthogonal signals to a digital estimate, for each of ... | 04/17/2007 |
| 7193397 | Voltage converter A voltage converter includes a transformer circuit, a filter, and a controller. The transformer circuit is coupled to the filter, and the controller is coupled to the transformer circuit and the filter. The transformer circuit includes an input port and an autotrans... | 03/20/2007 |
| 7049795 | Underload tapchanging voltage regulators for ease of field replacement and for improved operator safety Under load tapchanging voltage regulators with source and load connections, series and shunt transformers, switching devices for causing selectable levels of electric power to flow in either direction between the series and shunt transformers, and tapchanger control... | 05/23/2006 |
| 6608473 | Electrical machine, especially a three-phase generator The electrical machine, especially a three-phase generator, has a stationary stator (21); a rotatable rotor having an excitation coil (28), a rotary transformer (29) having a primary winding (30) and a secondary winding (31) on respective soft ferrite cor... | 08/19/2003 |
| 6320360 | Energy dimmer drive and energy pilot The invention includes an energy dimmer drive and energy pilot that controls the amount of current and voltage conveyed from an input to a load, based on values selected by the user. The current and voltage is varied by controlling the spacing between the... | 11/20/2001 |
| 5398011 | Microrelay and a method for producing the same A microrelay including a substrate having a pair of fixed contacts fixed on a surface thereof and a movable section having a pair of movable contacts opposed to the pair of fixed contacts. The movable section includes a frame for fixing the movable sectio... | 03/14/1995 |
| 5327030 | Decoder and monolithic integrated circuit incorporating same A monolithic interface circuit for use with a linear variable differential transformer (LVDT) position transducer. The interface circuit includes a drive circuit for providing an excitation signal of selectable frequency and amplitude to the LVDT primary ... | 07/05/1994 |
| 5025214 | Circuit and process for converting a half bridge transducer output signal to an LVDT transducer output signal A circuit and a process for converting the output signal from a half bridge transducer to that from an LVDT transducer to enable direct use of either signal in an electronic column. The circuit subtracts the transducer exciting signal from a half bridge t... | 06/18/1991 |
| 4924171 | System for supplying power source by electromagnetic induction coupling Between two units which are separately arranged, a power source signal is supplied from one of the two units to the other unit via electromagnetic induction coupling by using induction coils, and data signals are mutually transmitted and received between ... | 05/08/1990 |
| 4904921 | Monolithic interface circuit for linear variable differential transformers A monlithic interface circuit for use with a linear variable differential transformer (LVDT) position transducer. The interface circuit includes a drive circuit for providing an excitation signal of selectable frequency and amplitude to the LVDT primary w... | 02/27/1990 |
| 4847548 | Signal conditioner for a linear variable differential transformer A signal conditioner for a linear variable differential transformer having a first amplifier which senses the differences in amplitude between secondary alternating current voltages in the two secondaries respectively, and a second amplifier which compare... | 07/11/1989 |
| 4540931 | Variable transformer and voltage control system A system for automatically controlling output voltage to correct for varying input voltage utilizes a transformer having a movable core structure. The output voltage from the transformer is sensed and made to conform to a predetermined standard by moving ... | 09/10/1985 |
| 4160193 | Metal vapor electric discharge lamp system A lamp system is provided wherein a high radiation intensity metal vapor electric discharge lamp is matched with a controllable regulating transformer which is characterized by having a sufficiently high open circuit voltage for striking an arc across the... | 07/03/1979 |
