Class 323/218 - Using impedance

Subclass of Class 323 - Electricity: power supply or regulation systems
Definition: Subject matter wherein the device which produces the shift
No. of patents: 29
Last issue date: 09/25/2007

Number	Title	Issue Date
7274357	Touch pad module including separate touch pad and control circuit units A touch pad module includes a touch pad unit for generating contact signals in response to operation thereof, a control circuit unit separate from the touch pad unit, and an electrical coupling unit having a first end coupled to the touch pad unit and a second end c...	09/25/2007
7262693	Process field device with radio frequency communication A field device for use in an industrial process control or monitoring system includes terminals configured to connect to a two-wire process control loop. The loop carries data and provides power to the field device. RF circuitry in the field device is provided for r...	08/28/2007
6999746	Image rejection mixer An image rejection mixer of reduced power dissipation includes a signal distributor supplied with local signals having a phase difference to distribute the local signals, a first and a second signal mixer for mixing the distributed local signals and RF signals havin...	02/14/2006
6900601	Control circuit of two current unidirectional switches A circuit for controlling two switches assembled in anti-parallel, comprising in series between two terminals of the anti-parallel assembly, two identical control stages respectively dedicated to each switch and between which is interposed a common impedance setting...	05/31/2005
6841950	Dimmable electrolumanescent lamp drivers and method therefor A method for dimmable control of a multiple output EL lamp driver is disclosed. The multiple output EL lamp driver has a power converter. A plurality of EL lamps are provided wherein one terminal of each EL lamp is coupled to a single common terminal. A plurality of...	01/11/2005
6288918	Switched power converter with hold-up time and harmonics reduction Switched power converter with hold-up time and harmonics reduction connected to an AC power mains through a first rectifier means (13) and connected to conversion means (19) supplying a regulated voltage. An energy storage means (16) connected in parallel with...	09/11/2001
5811961	Amplitude and phase adjustment circuit An amplitude and phase cancellation circuit for modifying or reducing the phase and amplitude of a signal includes a quadrature hybrid having four ports. A first port receives an input signal and a fourth port outputs an output signal derived from the inp...	09/22/1998
5663633	Touch control fan and method A control circuit for an electrical appliance having an inductive load includes a signal conditioning element, a control element, a power conditioning element, a power adjustment element, and a switching element. The control circuit is sensitive to input ...	09/02/1997
5650714	Orthogonal signal generation system A local signal of preset frequency is supplied to an input terminal of a signal input section. The local signal is supplied to a control input terminal of a variable current source, a current corresponding to the local signal is output from the variable c...	07/22/1997
5627454	Method for stabilizing a power supply network against reactive load fluctuations, and a power factor compensation device During operation, DC arc furnaces (8) produce undesired reactive load fluctuations which are compensated by means of a power factor compensator (31). An AC power controller (28) of the power factor compensator (31) is controlled as a function of a stabili...	05/06/1997
5608311	AC input for digital processor with capacitively coupled immunity and surge withstand A circuit for inputting an ac signal to a digital processor includes a capacitor connected to the input and ground. A rectifier, preferably a transient voltage suppression device, permits the capacitor and also the stray capacitance which couples false si...	03/04/1997
5568042	Monitoring and control of a filter in a power network In a method for monitoring and/or control of a plant component (4A, 4B, 4C, 4D) connected to an electric power network (N1, N2), for example a tunable filter for harmonic filtering or a capacitor bank for generating reactive power in a converter plant for...	10/22/1996
5420495	Transmission line power flow controller A transmission line power flow control system and method selectively reverses power flow direction and controls power flow level over a transmission line. A capacitor having a variable capacitive impedance is selectively inserted in series with the line. ...	05/30/1995
5355076	Phase controlled capacitor for series compensation of a high voltage transmission line A compensating circuit arrangement for a power transmission system for rapidly inserting capacitance into a transmission line for desired portions of cycles of the operating frequency of the system, has first anti-parallel connected thyristors in series w...	10/11/1994
5227713	Vernier control system for subsynchronous resonance mitigation A subsynchronous resonance mitigation system, including a method and apparatus, for damping undesirable subsynchronous resonance oscillations in a generator, which, if left unchecked, may damage the shafts of a turbine-generator set. A remote coupling app...	07/13/1993
5166597	Phase-shifting transformer system A faster, more controllable phase-shifting transformer system is provided, along with a method of retrofitting and upgrading a preexisting system for faster operation, and a method of applying a desired phase shift to the voltage on a polyphase transmissi...	11/24/1992
5043654	Phase Shifter having parallel RC networks Phase shifter to which are applied two signals in a phase opposition (v, -v) is constituted by a first series circuit of a resistor and a capacitor (R1, C1), and a second series circuit of a resistor and a capacitor (R2, C...	08/27/1991
4751453	Dual phase shifter A variable dual phase shifter for simultaneously varying the phase shifts in two signal paths by equal and opposite amounts comprises two 90° hybrids in the respective signal paths, and a pair of substantially identical transmission lines connecting outp...	06/14/1988
4725767	Phase shifter A phase shifter includes first and second series-connected resistor circuits each including first and second resistors and each interposed between each one of two input terminals and each one of two output terminals, and includes capacitors each interpose...	02/16/1988
4719402	VAR generator system with minimal standby losses In a hybrid switched-capacitor controlled-reactor static VAR compensator including a fixed-capacitor, hysteresis on switching-OFF a switchable capacitor of the capacitance bank is performed with a minimal fixed-hysteresis at the entrance of the standby re...	01/12/1988
4684875	Power conditioning system and apparatus Power conditioning apparatus exhibiting enhanced stability with respect to lagging phase angle conditions incurred in conjunction with load derived transients. The apparatus employs a synthesizer network structured having a regulator which is fashioned as...	08/04/1987
4672155	Coordinate reader A coordinate reader comprises first and second conductor loops each having an electrical conductor so that electrical conductors of the respective conductor loops are juxtaposed on an electrically insulating board, a cosine function generator connected to...	06/09/1987
4663583	Automatically variable phase characteristic all-pass circuit An automatically variable all-pass circuit includes a variable impedance circuit for changing the shape of the phase characteristic of the output signal of the all-pass circuit as a function of the amplitude of the output signal of the circuit....	05/05/1987
4661763	Phase shifter Phase shifters are used in meshed, multi-phase power supply systems for improving their transmission stability and for load-flow regulating purposes. In order to be able to use a less costly exciter transformer of lower rating or the tertiary or compensat...	04/28/1987
4570033	Polyphase digitizer A two dimensional digitizing system comprises two systems at right angles to each other, comprising two conducting grid structures each having three terminals A, B, and C, with the grid conductors running parallel to the X axis in one system and the Y axi...	02/11/1986
4531085	Polyphase line voltage regulator A polyphase line voltage regulator which uses polyphase pulse saturable ferroresonant reactors in series with three separate and equal input chokes. The line voltage regulator is particularly suitable for computer operations which impose a variable curren...	07/23/1985
4340850	Temperature responsive control circuit The delivery of alternating current from a source to a load, especially a sistance heater, is accurately controlled as a function of temperature through the employment of a bidirectional solid state switch. A full-wave power control for the solid state sw...	07/20/1982
4296369	Active quadrature current reference source This reference source provides a current which is of relatively high magnitude and which leads the voltage by substantially 90°. It includes a reference capacitor which is highly stable and pure but of low capacitance, and a power capacitor which has a h...	10/20/1981
4101821	Variable phase shifting apparatus Variable phase shifting apparatus for selectively altering the phase of an AC signal. The signal is conducted through a series of stages. Each stage includes an operational amplifier having an input resistor and a feedback resistor. A capacitor is associa...	07/18/1978

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Class 323/218 - Using impedance