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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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 (R 1 , C 1 ), and a second series circuit of a...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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3806794 |
PHASE SHIFTER WITH SINGLE POTENTIOMETER CONTROL
Apparatus for controllably shifting the phase of a signal of a given frequency by at least 360° by means of a single potentiometer control. A pair of emitter follower configured transistors are...
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3775668 |
CIRCUIT ARRANGEMENT FOR PRODUCING TWO FREQUENCY INDEPENDENT MUTUALLY PHASE SHIFTED OUTPUT A.C. VOLTAGES FROM TWO INPUT A.C. VOLTAGES
A circuit arrangement wherein two output a.c. voltages having a mutual phase shift are derived from two input a.c. voltages. The mutually phase shifted output voltages are frequency independent and...
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3748572 |
WIDE FREQUENCY RANGE PHASE SHIFTER DEVICE
A wide frequency range phase shifter for shifting phase of an ac signal by a predetermined amount with less than one degree phase error over substantially a five to one frequency range. A phase...
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3735245 |
PHASE SHIFTER CIRCUIT
A phase shift circuit capable of shifting the phase of an input signal over a 360° range. It consists of a center tapped feed transformer with its outer terminals connected across the outer...
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3694567 |
CONSTANT AMPLITUDE PHASE SHIFTER
In many color television circuitry designs, a 3.58 mHz reference signal is provided to the automatic phase control phase detector and the color killer phase detector, and in a closed loop color...
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3688183 |
HYBRID POWER REGULATOR COMPRISING RHEOSTAT AND DIODE
An AC power regulator is provided which employs both resistance and phase regulation. Between zero and half power, resistance regulation is employed in series with a unidirectional conducting...
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3617863 |
CONSTANT AMPLITUDE-VARIABLE PHASE CIRCUIT
An electronic circuit including an operational amplifier having a differential input stage coupled to passive linear input and feedback circuit components for converting three wire synchro-type...
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3568045 |
ALTERNATING CURRENT DEVICES FOR OBTAINING A 90° PHASE SHIFT
An alternating current device for establishing adjustable currents having a 90° phase shift by which the in phase and quadrature components of an applied AC voltage may be measured. The device...
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3548296 |
METHOD AND APPARATUS FOR CONTROLLING THE PHASE ANGLE AND AMPLITUDE OF A PERIODIC SIGNAL BY USING TWO PHASES OF A REFERENCE SIGNAL
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3502960 |
IGNITION CONTROL CIRCUIT HAVING A PHASE SHIFT NETWORK FOR CONTROLLED RECTIFIERS CONNECTED IN INVERSE PARALLEL RELATIONSHIP
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3477017 |
TRANSDUCER EXCITATION CIRCUITS
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3447069 |
LIGHT RESPONSIVE PHASE SHIFTING CIRCUITRY
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3436647 |
PHASE SHIFTING CONTROL BY PHASE COMPARISON OF SIGNALS
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3314004 |
Wideband phase shifter selectably altering the phase angle of an applied signal
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3302100 |
Continuously variable phase shifter using a passive network terminated in an active impedance transforming device
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3287626 |
Phase shifting networks
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3287628 |
Variable phase shifter having greater than 180 u deg. range utilizing fixed reactances and potentiometer to effect phase shift
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3287627 |
Wide range phase shifter
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3267358 |
Phase shifter networks
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3267359 |
Phase slope compensator
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3211993 |
Synchro read-out circuit
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3210649 |
Adjustable impedance circuits employing exponentially variable elements
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3196368 |
Wide angle phase shifter or modulator
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3130362 |
Automatic phase stabilizer system
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