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| Number | Title | Issue Date |
| 8164314 | Distributed capacitor bank controllers and methods thereof A distributed capacitor bank controller for power factor correction of a power system may include a first distributed meter, a second distributed meter, a programmable logic controller and a communications pathway. The first and second meters may be operable to prov... | 04/24/2012 |
| 8134346 | System and method for power factor correction A system and method for dynamically adjusting capacitance added in parallel to an electrical line input for improving efficiency of an electrical system. A microprocessor monitors in real time the current and voltage wave forms of a system and selects the optimum am... | 03/13/2012 |
| 7436661 | Two-compartment AC adaptor An external AC power adaptor having an additional compartment for cooling. The adaptor has a housing that defines a first compartment having power circuitry for converting an AC input to a DC output and a second compartment that has an opening formed in the adaptor ... | 10/14/2008 |
| 7382303 | Non-perturbing power supply margin controller A power supply margin controller may alter the voltage of a control signal used to control the output voltage of a power supply. The controller may include a digital-to-analog converter having an input and an output, and a comparator having a first input coupled to ... | 06/03/2008 |
| 7365525 | Protection for switched step up/step down regulators A four switch voltage converter is regulated for buck mode and boost mode under constant frequency valley-peak current mode control. Protection circuits are responsive to output voltage and regulator current to prevent excessive current that otherwise might result f... | 04/29/2008 |
| 7365999 | Circuit arrangement In an up-converter supplied by the mains supply and operating in the critical mode, the on-time of the switching element (2) is modulated so that it is increased in the vicinity of the zero crossings of the mains supply voltage. As a result the THD is lowered... | 04/29/2008 |
| 7362557 | Method, apparatus and article for bi-directional DC/DC power conversion A controller implements a state machine for operating the bi-directional power converter with a flexible load pattern while maintaining a thermal condition of the power converter within acceptable limits. The state machine implements a wait loop in response to selec... | 04/22/2008 |
| 7353122 | Power converters with limited operation to conserve power and with adjustments that overcome ringing To conserve power when regulating the output voltage (Vo) of a power converter, no adjustment is made to the converter's pulse width modulation times (Tp, Ts) even if the output voltage is off target (Vtar), provided that the output voltage does not change or is mov... | 04/01/2008 |
| 7353308 | Avoiding oscillation in self-synchronous bi-directional communication system In a bi-directional, self-synchronous bus for communication between semiconductor devices, a logic delay is provided as a flag to a state machine control for indicating that the bus is making a transition from a low to a high state. The logic delay causes the bus to... | 04/01/2008 |
| 7337080 | Method and apparatus for instrument transformer reclassification Systems and methods for reclassifying instrument transformers. A line mounted device that includes a sensor that can be attached to a power line. The line mounted device generates data or representations of the power parameters of the power line. A processor in the ... | 02/26/2008 |
| 7312582 | Electronic ballast An electronic ballast for driving at least one lamp comprising a rectifying circuit operatively connectable to an AC line; a current drawing circuit connected across said rectifying circuit; and an inverter circuit connected to said rectifying circuit that supplies ... | 12/25/2007 |
| 7309975 | Process for operating a switching power supply There is provided a process for operating a switch mode power supply circuit (Switcher) connectable to a load, the circuit having a first buck switch, a second boost switch and an inductor in a buck boost circuit, the process including applying input voltage to the ... | 12/18/2007 |
| 7277779 | Real-time emergency control in power systems The present invention is concerned with a method for real-time emergency control of power transmission networks, based on a modification of the model predictive control (MPC) approach. Following the detection of a contingency at time tc only one nominal t... | 10/02/2007 |
| 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 |
| 7265959 | Solid state switch with quasi-predictive short circuit protection and thermal protection A protection circuit detects short circuit and/or current overload conditions based on one of a current level and a current change rate di/dt of a current through a load. A detection device uses an inductor to detect current change rate and a resistor to detect curr... | 09/04/2007 |
| 7265521 | Reactive power compensation to minimize step voltage changes and transients The invention features a system and approach for minimizing the step voltage change as seen by the utility customer as well minimizing transients imposed on the fundamental waveform of a normal voltage carried on a utility power network when a reactive power source ... | 09/04/2007 |
| 7256570 | Light load current-mode control for switched step up-step down regulators A switched regulator circuit provides step-up and step-down operation at high efficiency during light load conditions. Switching loss is reduced in a four switch arrangement by limiting bottom MOSFET switching frequency. The possibility of overcharge in boost mode o... | 08/14/2007 |
| 7230989 | System and method for processing digital visual interface communication data signals and display data channel communication signals over a transmission line A digital communication system for transmitting and receiving Digital Visual Interface (DVI) communication data signals and Display Data Channel (DDC) communication signals over a transmission line comprises an open-loop equalizer circuit and a DDC extension circuit... | 06/12/2007 |
| 7211081 | Electrosurgical generator An electrosurgical generator for supplying RF power to an electrosurgical instrument for cutting or vaporising tissue has an RF output stage (42) with an RF power bridge (Q1, Q2, Q3, Q4), a pair of output lines (74) and a se... | 05/01/2007 |
| 7208928 | Oscillatorless DC-DC power converter A power converter for coupling an energy source to a load device comprising a selectively coupled output stage to deliver energy from an energy source to a load device, a controller coupled to the output stage, an output stage, a capacitive element coupled to the ou... | 04/24/2007 |
| 7208919 | Method and apparatus for digitally regulating an output voltage using noise-shaped component selection Provided is a digitally-controlled linear regulator having noise-shaped component selection. The digitally-controlled linear regulator has a regulated-voltage sensor, a comparator module, a quantization module, and an impedance switching network. The regulated-volta... | 04/24/2007 |
| 7199528 | Control circuit for maintaining constant power in power factor corrected electronic ballasts and power supplies The control circuit for maintaining constant power in power factor corrected electronic ballasts and power supplies maintains constant power in a variable load. This constant power control circuit provides a closed loop constant power management process for gas disc... | 04/03/2007 |
| 7195627 | Electrosurgical generator An electrosurgical generator for supplying RF power to an electrosurgical instrument for cutting or vaporising tissue has an RF output stage with RF output devices, a series-resonant output network and an RF output. The generator offers improved cutting and vaporisi... | 03/27/2007 |
| 7187569 | Signal generation apparatus and method for seafloor electromagnetic exploration An apparatus for generating electronic signals for application in subsea electromagnetic exploration. A surface generated high-voltage low-current source signal stabilized at a first frequency is supplied to a deep-tow vehicle (18) via an umbilical cable (... | 03/06/2007 |
| 7183752 | Connection method for a static VAR compensator A static VAR compensator has several parallel compensation components (K1–K3). To connect the static VAR compensator to an operating voltage (U) the compensation components (K1–K3) are first successively connected to the operating vol... | 02/27/2007 |
| 7154248 | Control system for an electric machine There is provided an adjustable integral component in a feedback loop of a closed loop control system. The closed loop control system controls an output signal of an electric generator. The adjustable integral component provides an integral signal. The integral sign... | 12/26/2006 |
| 7151680 | Switching power supply circuit and frequency converter An object of the present invention is to lower the voltage applied to the starting resistor of the starting circuit in a switching power supply circuit to reduce the power loss especially when the receiving voltage is high and thereby provide a small and inexpensive... | 12/19/2006 |
| 7142997 | Automatic power factor corrector A computer controlled solid-state switching power factor corrector, which senses the phase angle of each phase of the current as well as the voltage and automatically aligns the current phase angle to the voltage phase angle. This power factor correction is designed... | 11/28/2006 |
| 7132950 | Power management method and system The present invention provides a new application for an inductive coupler (12) used proximate a power transmission line (14). The magnetic field based power measurement method and system discussed herein in unique and differs from the prior technology ... | 11/07/2006 |
| 7129648 | Interface circuit for operating capacitive loads An interface circuit suitable for operating capacitive loads such as electric ballasts for lamps at a mains supply circuit, in particular a phase gating dimmer. The interface circuit short-circuits the load input if the mains supply circuit does not carry out a load... | 10/31/2006 |
| 7129865 | High speed, low power comparator A method for reducing bit errors in an analog to digital converter having an array of comparators. The outputs of first and second comparators are received as in inputs to an Exclusive OR gate. The first and second comparators are separated in the array by a third c... | 10/31/2006 |
| 7124041 | Systems, methods, and devices for detecting circuit faults Certain exemplary embodiments can comprise a method for detecting a circuit fault, comprising: for a sensor coupleable to an input circuit, the sensor characterized by an output signal operating voltage range: automatically causing the sensor to be electrically disc... | 10/17/2006 |
| 7102860 | Power limiting time delay circuit A power limiting circuit for power supply that is controlled by a power supply control module includes a shunt regulator having a reference input operatively connected to a voltage input that receives a voltage representative of the power supply control module conne... | 09/05/2006 |
| 7091703 | Dynamic reactive compensation system and method The invention features a system for connection to a utility power network. The system includes a reactive power compensation device coupled to the network and configured to transfer reactive power between the utility power network and the reactive power compensation... | 08/15/2006 |
| 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 |
| 7067011 | Apparatus and method for discharge surface treatment An apparatus has a green compact electrode including a material of a coating formed on a workpiece by a discharge, a power source for supplying a first voltage, a voltage detector for detecting a voltage between the workpiece and the electrode, and a pulse current g... | 06/27/2006 |
| 7064527 | Transition mode operating device for the correction of the power factor in switching power supply units A transition mode operating device for the correction of the power factor in switching power supply units includes a converter for receiving an input voltage and for providing a regulated output voltage, and a coupled control device. The converter includes a power t... | 06/20/2006 |
| 7057414 | Avoiding oscillation in self-synchronous bi-directional communication system In a bi-directional, self-synchronous bus for communication between semiconductor devices, a logic delay is provided as a flag to a state machine control for indicating that the bus is making a transition from a low to a high state. The logic delay causes the bus to... | 06/06/2006 |
| 7057440 | Multiplier-divider circuit for a PFC controller The present invention introduces an integrated analog multiplier-divider circuit. The multiplier-divider block according to the present invention is ideal for use in the power factor correction (PFC) controllers of many switch-mode power supplies. The analog multipl... | 06/06/2006 |
| 7053503 | Cross current compensation control system for a power system Across current compensation control system includes a cross current detection compensator having an input terminal to which a cross connection line that cross-connects the secondary sides of auxiliary current transformers (CTs) are connected, and an output terminal ... | 05/30/2006 |
