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| Number | Title | Issue Date |
| 8130519 | Led driver with low harmonic distortion of input AC current and methods of controlling the same A power supply circuit for powering a load at constant current has a rectifier stage for receiving an AC voltage input and for producing a first substantially DC voltage. A first capacitor is attached to the load. A charge-pump is attached to an output of the rectif... | 03/06/2012 |
| 8080958 | Power conversion device A power conversion device includes a main circuit that has switches connecting each phase of a three-phase AC power supply to each output phase, an LC filter having a reactor and a capacitor connected between the three-phase AC power supply and each bidirectional sw... | 12/20/2011 |
| 8014181 | Power conversion control system A power distribution system comprises a power conversion module for performing power conversion between a DC voltage at a DC side and an AC power at an AC side, and a conversion control system. The AC side of the power conversion module is electrically coupled to a ... | 09/06/2011 |
| 7986539 | Method and apparatus for maximum power point tracking in power conversion based on dual feedback loops and power ripples A method and apparatus for converting DC input power to AC output power. The apparatus comprises a conversion module comprising an input capacitor, and a first feedback loop for determining a maximum power point (MPP) and operating the conversion module proximate th... | 07/26/2011 |
| 7864554 | Circuit for reducing the variations of auto-supply voltage of a control circuit of a switching power supply A circuit for reducing the variations of auto-supply voltage of a control circuit of a switching power supply, where the control circuit supplies an activation or deactivation signal of a power transistor, includes an auto-supply voltage generator, a controlled swit... | 01/04/2011 |
| 7405526 | Control apparatus and control method for voltage conversion apparatus The SOC of a battery is calculated based on the voltage Vb and current Ib of a battery, and a battery electromotive voltage Vbo is calculated based on the SOC of the battery. Based on the battery electromotive voltage Vbo and the voltage Vc of a capacitor connected ... | 07/29/2008 |
| 7402960 | LED-based lamp apparatus A LED-based lamp apparatus includes a LED unit having multiple LEDs connected in series, a step-up circuit for stepping up a power supply voltage by a switching action of a switching element to supply an electric current to the LED unit, a sensing element for measur... | 07/22/2008 |
| 7363518 | Information handling system with power fault protection circuit An information handling system (IHS) employs a power fault protection circuit to protect the IHS from overvoltages which may occur on an information line from a power adapter to the IHS. The system includes a processor coupled to the protection circuit. The circuit ... | 04/22/2008 |
| 7363522 | Apparatus and methods for information handling system with power supply device with variable output power An information handling system includes a power source configured to provide a plurality of power levels to a load. At least one of the plurality of power levels corresponds to a level obtained by de-rating a capacity of the power source from a nominal design specif... | 04/22/2008 |
| 7317306 | Nonlinear adaptive voltage positioning for DC-DC converters The present invention provides a nonlinear adaptive voltage positioning DC-DC converter method and apparatus that enable improved voltage transient response under changing current conditions for a load with known current draw characteristics. The invention in some e... | 01/08/2008 |
| 7271646 | Loop powered process control instrument power supply A loop powered process instrument comprises a control circuit measuring a process variable and developing a control signal representing the process variable. An output circuit for connection to a two-wire process loop controls current on the loop in accordance with ... | 09/18/2007 |
| 7257466 | Intelligent control devices A control device operates to selectively provision power. The control device can be implemented as part of an electrical apparatus, such as a computer, television, VCR, hairdryer or other device which operates on AC power. The control device can be also implemented ... | 08/14/2007 |
| 7240226 | Electronic apparatus, power controlling apparatus and power controlling method When a power switch is pushed, a CPU starts a BIOS stored in a BIOS-ROM to initialize a system. In this initialization of the system, a system configuration determining portion acquires various device information, determines a system configuration, and judges the ki... | 07/03/2007 |
| 7202637 | Distributed control method The present invention provides an improved control method and apparatus allowing units arranged at different spaced apart locations to be controlled without the need for a high bandwidth link between the units and the controller. This allows a single controller to c... | 04/10/2007 |
| 7199537 | Voltage converter control apparatus, and method By using a target voltage Vc* of a capacitor connected to the output side of a DC/DC converter and a voltage Vb of a battery connected to the input side of the DC/DC converter, a duty ratio D as a drive instruction of the DC/DC converter is calculated. By using the ... | 04/03/2007 |
| 7148650 | Maximum power point motor control A method and apparatus are implemented in software to control motor speed as a function of available power in a DC source-inverter-AC motor system, i.e. to perform maximum power tracking of motor speed. An inverter or motor drive converts DC power from a DC source, ... | 12/12/2006 |
| 7129800 | Compensation technique to mitigate aging effects in integrated circuit components A method and apparatus for compensating for age related degradation in the performance of integrated circuits. In one embodiment, the phase-locked loop (PLL) charge pump is provided with multiple legs that can be selectively enabled or disabled to compensate for the... | 10/31/2006 |
| 7131011 | System and method for preserving state data of a personal computer in a standby state in the event of an AC power failure A mechanism is provided for a personal computer to preserve user and system state data in the event of an AC power failure when the computer is in a standby state. When the AC power failure occurs, a switchover circuit connects a rechargeable energy storage medium, ... | 10/31/2006 |
| 7126241 | Intelligent adapter In one aspect the present invention provides an AC/DC or DC/DC adapter, comprising circuitry to generate a signal proportional to the maximum adapter current. In another aspect, the present invention provides a portable electronic device, comprising circuitry to rec... | 10/24/2006 |
| 7120038 | Control system for a voltage converter The invention relates to a control system for a voltage converter, said control system comprising:—a set of switches (T1-T2-T3-T4) intended to be connected via output terminals (N1-N2-N3) to a first type of voltage ... | 10/10/2006 |
| 7109682 | Contactless power transmitting device A contactless power transmitting device is provided including a power transmitting device functioning as a charger, a power transmitting-receiving sharing device functioning as a charger and including a secondary battery, and a power receiving device including a sec... | 09/19/2006 |
| 7080265 | Voltage set point control scheme A system and method is provided for determining a voltage output of a programmable power converter based on programming voltage data received from one of a variety of alternate sources. Specifically, in one embodiment of the present invention, a control unit is adap... | 07/18/2006 |
| 6998800 | Current sensor for DC powered three phase motor control system A system is provided for sensing a motor current from a three phase inverter. A first resistor is coupled between a first transistor of the inverter and a supply voltage, and a second resistor is coupled between a second transistor of the inverter and ground. Circui... | 02/14/2006 |
| 6996389 | Power supply for a satellite receiver A power supply for a satellite receiver system includes a dual input supply voltage arrangement. When a higher output voltage is selected, a source of a lower supply input voltage is coupled to an input main current conducting terminal of a series pass transistor. O... | 02/07/2006 |
| 6984953 | Method and apparatus for reconstructing motor current from DC bus current In a PWM space vector modulation inverter motor drive system, PWM cycles are modified to permit motor phase currents to be reconstructed as observable on the DC bus link. The PWM cycles are modified near sector boundaries so that measurements taken at the DC bus lin... | 01/10/2006 |
| 6900643 | Ride through in electronic power converters A system including a current sensor to sense a current provided by an electronic power converter, the current sensor includes an output; an overcurrent detection circuit with an input coupled to an output of the current sensor; and a logic control circuit configurab... | 05/31/2005 |
| 6683286 | Method and apparatus for producing power for induction heating with bus bars comprised of plates An induction heating power supply is disclosed. It includes a power circuit having at least one switch and a power output. The output circuit includes an induction head. The output circuit is coupled to the power output. A controller has at least one feed... | 01/27/2004 |
| 6683422 | Full wave sense amplifier and discharge lamp inverter incorporating the same A full wave sense amplifier for sensing a periodic current flowing through a discharge lamp is disclosed. The full wave sense amplifier comprises a first circuit for sensing the positive going portion of the periodic current. The amplifier also includes a... | 01/27/2004 |
| 6618277 | Apparatus for reducing the supply noise near large clock drivers An apparatus for reducing power supply noise in the power supply system of a clock driver has been developed. The apparatus includes a clock driver with a power supply system connected to the clock driver and a shunting resistor connected across the power... | 09/09/2003 |
| 6586900 | Method for boosting the output voltage of a variable frequency drive A sine wave filter including an inductor for each phase (three inductors) and three delta- or Y-connected capacitors is employed within a borehole power system, coupled within a three phase power system at the surface between the output of a variable freq... | 07/01/2003 |
| 6567252 | Protection circuit for a power supply unit and respective power supply unit The protection circuit for a power supply unit comprises a switching stage, at which at least two output voltages to be monitored are connected, these voltages being isolated from one another by means of resistors. Arranged here in the connection path of ... | 05/20/2003 |
| 6519538 | Method for predicting stability characteristics of power supplies A method for determining the effect of load impedance on the magnitude and phase of loop gain of a power converter apparatus to aid in predicting stability of the converter apparatus under various operating conditions. The converter apparatus has an open-... | 02/11/2003 |
| 6515430 | Power supply for lamps The invention relates to a power supply for an illumination system used to expose photo-initiated adhesives. The illumination system includes an arc lamp to provide light. As the lamp ages, its electrodes deteriorate, reducing the amount of light directed... | 02/04/2003 |
| 6507167 | Power factor compensation device for motor driving inverter system The present invention relates to a power factor compensation device for a motor driving inverter which can improve a power factor of a voltage and a current inputted to the inverter driving a motor. The present invention detects a zero crossing point of a... | 01/14/2003 |
| 6498738 | Reverse level shift circuit and power semiconductor device A reverse level shift circuit that is low in cost and excellent in reliability is provided by employing no Pch-DMOS transistor and forming it together with a level shift circuit on one semiconductor substrate. An input voltage signal (VIN) on high side is... | 12/24/2002 |
| 6477068 | Apparatus and method for controlling DC power to primary and secondary load utilizing capacitor An apparatus for supplying and controlling electrical power having a power source for supplying electrical power to a primary load and a secondary load, a capacitor connected to an input to the secondary load and control means operable to cause an operati... | 11/05/2002 |
| 6407603 | Analog voltage isolation circuit An analog voltage isolation circuit includes an error amplifier-integrator having an error-output voltage, which is compared to a selected value referenced to the same ground potential as the input signal being measured. The comparator output varies the c... | 06/18/2002 |
| 6392210 | Methods and apparatus for RF power process operations with automatic input power control A variable frequency RF power delivery system is used with a control system that adjusts the output frequency of the RF power delivery system. Frequency adjustments are made so as to maintain the required input current and input voltage within the capabil... | 05/21/2002 |
| 6337788 | Fault condition protection A circuit protects a power conversion system with a feedback control loop from a fault condition. The circuit has an oscillator having an input for generating a signal with a frequency and a timer connected to the oscillator input and to the feedback cont... | 01/08/2002 |
| 6316756 | Resonant frequency tracking system and method for use in a radio frequency (RF) power supply A radio frequency (RF) power system for providing RF power to a load. The RF power system comprises a tank circuit; a direct current (DC) voltage source that provides a DC voltage within a first predetermined range; an amplifier, coupled to said DC voltag... | 11/13/2001 |
