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...When G.G. Hubbard learned of his future son-in-law's invention, he called it "only a toy." His daughter was engaged to a young man named Alexander Graham Bell.
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| Number | Title | Issue Date |
| 8094472 | Power factor correction converter capable of fast adjusting load A power factor correction converter capable of fast adjusting load functions to (a) convert a single-phase AC voltage into a DC voltage output; (b) control an input current and an input voltage for a correspondent electrical phase, namely the power factor that is 1;... | 01/10/2012 |
| 8084974 | Inverter device There is provided an inverter device capable of simplifying the circuit structure, lowering the cast, and downsizing of the device. The inverter device detects a switching change of an inverter by a pulse and is equipped with a pulse signal detector capable of detec... | 12/27/2011 |
| 7894221 | Detection circuit A detection circuit for generating a control signal for controlling output voltage of an AC adapter. The detection circuit for an electronic device receives power information from an external power supply via a cable to generate the control signal that controls DC i... | 02/22/2011 |
| 7643320 | Isolated resistive signature detection for powered devices In one embodiment, a load connected to power sourcing equipment (PSE) compatible with a Power over Ethernet (PoE) standard is characterized to determine whether the load corresponds to a valid powered device (PD). A switching signal having a first frequency is gener... | 01/05/2010 |
| 7613021 | Small form factor power supply A small form factor power supply includes a switching transformer, control circuitry and rectifier circuitry, each contained within a housing. The switching transformer has a planar core and windings which surround at least a portion of the planar core. The control ... | 11/03/2009 |
| 7417879 | PFM and current controlled switching regulator A circuit and method for controlling a switching regulator utilize a combination of variable off-time control (or frequency control) and variable peak current control to achieve high efficiency at a wide range of load conditions. A non-linear control circuit receive... | 08/26/2008 |
| 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 |
| 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 |
| 7365997 | Synchronous switching control circuit for power converters The present invention provides a synchronous switching control circuit for variable switching frequency power converters. It comprises a first circuit to generate a first signal in response to an input synchronous signal of a power converter. A second circuit is cou... | 04/29/2008 |
| 7362595 | DC-DC converter A DC-DC converter includes a regeneration preventing circuit to bring a synchronous rectifying switching element to an OFF-state when an output of an error amplifier is lower than a lower-limit potential of a triangular-wave signal, that is, when the output of the e... | 04/22/2008 |
| 7336511 | Power supply control loop with multiple leveling modes A method and apparatus for controlling a power supply. The system includes a power supply and a controller for outputting a command signal to regulate the operation of the power supply. The controller determines the command signal based on at least one error signal ... | 02/26/2008 |
| 7323851 | Digital power factor correction controller and AC-to-DC power supply including same A PFC AC-to-DC power supply is disclosed. According to various embodiments, the PFC AC-to-DC power supply comprises a switching converter comprising at least one main power switch and a PFC controller for controlling the at least one main power switch. The PFC contr... | 01/29/2008 |
| 7312600 | AC power regulator circuit An electronic control system regulates and stabilizes AC line voltage to produce a constant AC voltage output. A switch-mode regulator circuit is employed in conjunction with a variable amplitude regulator to combine a feed-forward control with a variable amplitude ... | 12/25/2007 |
| 7292016 | Buck/boost DC-DC converter control circuit with input voltage detection A semiconductor device has a DC-DC converter control circuit for selectively carrying out a boosting operation and a deboosting operation in accordance with a value of a power supply voltage supplied to the DC-DC converter control circuit and for outputting an activ... | 11/06/2007 |
| 7280376 | Primary side voltage sense for AC/DC power supplies capable of compensation for a voltage drop in the secondary In a method and system for providing isolated power, a flyback controller includes a transformer operable to receive a primary voltage input and generate a secondary voltage output. A switch electrically coupled in series with a primary side of the transformer recei... | 10/09/2007 |
| 7274574 | Magnetically controlled transformer apparatus for controlling power delivered to a load with current transformer feedback A circuit with a magnetically variable transformer having primary and secondary windings wound on a magnetic core wherein the transformer core with associated windings is placed in close proximity to an independently wound control coil. The transformer core is place... | 09/25/2007 |
| 7271579 | AC signal level detection circuit An AC voltage generated by an AC power source 1 is rectified by a full-wave rectifying circuit 2, which generates a rectified voltage. An internal regulator 33 performs waveform shaping of the rectified voltage. A comparator 42 compares t... | 09/18/2007 |
| 7266003 | Programmable power supply A programmable power supply for providing a regulated DC output power is disclosed. The power supply provides the output power to any one of a plurality of electronic devices adapted for receiving the output power at an operational voltage or an operational current.... | 09/04/2007 |
| 7256632 | Pulse width modulation (PWM) controlling module and method for adjusting a PWM signal thereof A pulse width modulation (PWM) controlling module, includes: a PWM controller, a load detector, and an adjusting module. The PWM controller generates a PWM signal that is utilized for controlling a supply voltage applied to an electronic system. The load detector, c... | 08/14/2007 |
| 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 |
| 7206210 | Power supply control loop with multiple leveling modes A method and apparatus for controlling a power supply. The system includes a power supply and a controller for outputting a command signal to regulate the operation of the power supply. The controller determines the command signal based on at least one error signal ... | 04/17/2007 |
| 7202694 | Current sensing structure for integrated power switches Circuits and methods to sense the current through a coil of an integrated switching converter, applicable to boost and to buck converters, have been achieved. The present invention uses a “replica biasing” technique to avoid a resistor for current measurement. T... | 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 |
| 7176668 | Switching regulator with advanced slope compensation A switching regulator circuit with improved slope compensation for providing a regulated voltage to a load. The regulator circuit includes a power source and a switch circuit configured to control the coupling of the power source to the load. The operation of the sw... | 02/13/2007 |
| 7161336 | Power supply device and electronic equipment comprising same The present invention provides a power supply device which can suppress a voltage drop of the input power supply immediately after recovery from shutdown status. The power supply device comprises a reference voltage generation circuit for generating reference voltag... | 01/09/2007 |
| 7151671 | Power supply A power supply comprising switching elements (20), wherein the power supply is provided with first heat sinks (30) having electrical conductivity to which the switching elements are fitted and a second heat sink (40) mounted with the first heat ... | 12/19/2006 |
| 7145787 | Programmable power supply A power supply system includes a power source and a control circuit. The power source provides DC power. A control circuit, which is remote to the power source, receives the DC power and provides a first DC power signal to an electronic device. The control circuit i... | 12/05/2006 |
| 7136294 | Soft switched zero voltage transition full bridge converter A soft switched zero voltage transition full bridge converter for reducing power loss at very light loads for zero voltage switching (ZVS) converters operating at high frequency. The converter has four switches in two switching legs, each having two switches connect... | 11/14/2006 |
| 7095215 | Real-time voltage detection and protection circuit for PFC boost converters A circuit for providing protection for power factor correction (PFC) boost converters from conditions such as input voltage surges that can otherwise cause failure. The circuit also prevents unnecessary down time of the boost converter after a power failure or on st... | 08/22/2006 |
| 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 |
| 7047079 | Method and system for energy conservation in implantable stimulation devices The invention relates to a stimulation device with power conservation functionality. In implantable devices, power supplies may be limited. Replenishing these power supplies may require costly surgery or periodic recharging depending on the model. A method may be im... | 05/16/2006 |
| 7042743 | Power factor correction device for switching power supplies A power factor correction device for switching power supplies is described, which comprises a converter (20) and a control device (100; 200; 300) coupled with said converter (20) in such a way as to obtain from a input network alternated voltage... | 05/09/2006 |
| 7030597 | Photovoltaic-type charger A method of producing a photovoltaic panel that includes elementary photovoltaic cells in series and in parallel and intended for charging a low-voltage electrical energy accumulator via a voltage converter includes wiring a minimum number of elementary cells in ser... | 04/18/2006 |
| 7026785 | Motor controller A system and method for controlling an electric motor is disclosed. The method comprises determining the operating load of the electric motor and then calculating the voltage to be applied to the electric motor in response to the operating load. The voltage to be ap... | 04/11/2006 |
| 7020274 | Universal apparatus and method for interfacing signals with telephony networks A communication apparatus is used to interface signals with any one of a plurality of telephony networks having different impedances. The apparatus includes memory, a processor, a digital-to-analog (D/A) converter, and an interface port. Different sets of impedance ... | 03/28/2006 |
| 7015682 | Control of a power factor corrected switching power supply The specification may disclose a switching power supply operated in a discontinuous current power factor corrected mode, having multiple boost circuits or boost modules, and controlled by a digital signal processor. The digital signal processor may implement a contr... | 03/21/2006 |
| 6992906 | Synthetic rectifiers A synthetic rectifier comprises a MOSFET and a control circuit to turn the MOSFET off and on as a synchronous rectifier. The control circuit senses the current through the synthetic rectifier, and in particular is responsive to the rate of decrease of the current so... | 01/31/2006 |
| 6972974 | Compensator to achieve constant bandwidth in a switching regulator A switching regulator includes a compensation circuit for applying a scaling factor to the loop gain of the feedback control loop of the regulator. In operation, the loop gain of the feedback control loop has a dependency on the input and output voltages of the swit... | 12/06/2005 |
| 6956753 | Method and system for providing a temperature compensated feedback signal An electrical circuit for providing a temperature compensated feedback signal includes a first electrical component and a first amplifier. The first electrical component exhibits a first temperature variable impedance and is positioned in thermal contact with a firs... | 10/18/2005 |
