Did You Know...
...that the inventor of the electric motor was a blacksmith named Thomas Davenport? Described as "a brilliantly unsuccessful inventor", Davenport invented the first rotary electric motor. In 1836 he headed out -- on foot -- from his Vermont home to file a patent application at the Patent Office in Washington, D.C. By the time he got there, he had squandered away his money and couldn't afford the $30 filing fee so he turned around and went home. When he later mailed in his application with money he'd raised, the Patent office was destroyed in a fire. He did finally get credit for his invention on Feb. 5, 1837.
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| Number | Title | Issue Date |
| 8188719 | Voltage regulator Provided is a voltage regulator capable of stable operation under a light load so as to cover a wide range of load capacitances. The voltage regulator includes a circuit for charging a phase compensation capacitor for the voltage regulator, and a zero due to a resis... | 05/29/2012 |
| 8159197 | Circuit and method for constant on-time control for an interleaved multiphase voltage regulator A circuit and method are proposed for constant on-time control for an interleaved multiphase voltage regulator, which monitor the channel currents of all the channels of the interleaved multiphase voltage regulator to select one from the channels to drive and so ach... | 04/17/2012 |
| 8076912 | Semiconductor integrated circuit and method of controlling MEMS-type variable capacitance capacitor A first pump circuit generates a first voltage for decreasing the distance between primary electrodes. The first voltage is limited to a predetermined limit by a first limiter circuit. A second pump circuit generates a second voltage for keeping the distance between... | 12/13/2011 |
| 7834599 | Rapid supply voltage ramp using charged capacitor and switch In one embodiment, an apparatus is provided for a system including an integrated circuit coupled to a node to receive a supply voltage and having bypass capacitors coupled in parallel with the integrated circuit to the node. The apparatus comprises a first capacitor... | 11/16/2010 |
| 7728564 | Power supply for a load control device A load control device is adapted to be disposed in series with an AC voltage source and an electrical load and is operable to provide substantially all voltage provided by the AC voltage source to the load. The load control device comprises a controllably conductive... | 06/01/2010 |
| 7564226 | Rapid supply voltage ramp using charged capacitor and switch In one embodiment, an apparatus is provided for a system including an integrated circuit coupled to a node to receive a supply voltage and having bypass capacitors coupled in parallel with the integrated circuit to the node. The apparatus comprises a first capacitor... | 07/21/2009 |
| 7564227 | Power supply for a load control A power supply adapted to be coupled in series electrical connection between an AC voltage source and an electrical load for generating a DC voltage, the power supply comprising an energy storage capacitor, the DC voltage produced across the capacitor; a charging ci... | 07/21/2009 |
| 7423413 | Power supply for a load control device A power supply for a load control device is disposed in series with an AC voltage source and a load and generates a substantially DC voltage for powering a controller of the load control device. The power supply is operable to provide substantially all voltage provi... | 09/09/2008 |
| 7403049 | Triangular wave generation circuit A first constant-current source supplies a charging current to a second terminal of a first capacitor in which a first terminal is grounded. A first terminal of a second capacitor is grounded, and a first switch is provided between the second terminal of the first c... | 07/22/2008 |
| 7339331 | Dimmer circuit with improved ripple control A dimmer circuit arrangement is disclosed including a second control circuit for controlling the operation of a triac for delivering current to a load, and a first control circuit for controlling the operation of an IGBT power semiconductor switch for controlling th... | 03/04/2008 |
| 7291984 | Method of reducing RMS load voltage in a lamp using pulse width modulation A method of converting a line voltage to an RMS load voltage in a lamp includes modulating a load voltage with a pulse width modulation circuit that is entirely within the lamp and provides an RMS load voltage to a light emitting element of the lamp. Conduction is t... | 11/06/2007 |
| 7274148 | Lamp having fixed forward phase switching power supply with time-based triggering A lamp contains a lamp voltage conversion circuit that is entirely within a base for converting a line voltage at a lamp terminal to an RMS load voltage at a light emitting element. The voltage conversion circuit includes a forward clipping circuit with a three-term... | 09/25/2007 |
| 7271550 | Dimmer circuit arrangement A dimmer circuit arrangement is disclosed including a second control circuit (40) for controlling the operation of a triac (50) for delivering current to a load (60), and a first control circuit (10) for controlling the operation of an IG... | 09/18/2007 |
| 7256689 | Flashing device for vehicle A flashing device for a vehicle includes a power filtering unit connected to a power source for outputting a negative voltage after filtration, a detecting unit for detecting the negative voltage from the power filtering unit, an oscillating unit electrically connec... | 08/14/2007 |
| 7245519 | Digitally programmable capacitor array A programmable capacitor array does not require separate switching transistors because the capacitors themselves have a switchable capacitance, which capacitors are made in the manner of regular N channel transistors with their source/drains connected to each other.... | 07/17/2007 |
| 7224130 | Method of operating a lamp containing a fixed phase power controller A method of operating a lamp that has a power controller connected between a terminal and a light emitting element that converts the line voltage to an RMS load voltage. An input to an analog control block is provided in the controller that is independent of a chang... | 05/29/2007 |
| 7221106 | Cordset based appliance controller An apparatus and method for distributed control of an electrical appliance having a plug and a load and two power carrying conductors connecting the plug to the load, comprising locating power control elements completely within the plug, connecting interface element... | 05/22/2007 |
| 7218054 | Lamp having fixed phase power controller with analog trigger A lamp which includes a fixed phase power controller connected between a terminal and a light emitting element converts line voltage to an RMS load voltage. The controller has an analog control block that receives an input that is independent of a change in magnitud... | 05/15/2007 |
| 7199532 | Lamp containing phase-control power controller with analog RMS load voltage regulation A lamp includes a phase-control power controller within the lamp. The phase-control power controller includes an analog load voltage sensor that provides an optical output related to an RMS load voltage and a phase-controlled dimming circuit that has a comparison ci... | 04/03/2007 |
| 7161521 | Multi-stage analog to digital converter architecture According to an aspect of the present invention, different reference voltage levels are used for different stages of a multi-stage analog to digital converter (ADC). In one embodiment, the amplification and unity gain bandwidth (UGB) requirements in the first stage ... | 01/09/2007 |
| 7154250 | Buck-boost DC—DC switching power conversion Apparatus operates at a power level within a range of power levels that includes a rated maximum power level of the apparatus. The apparatus includes circuit elements to deliver power at an output voltage to a load from a source at an input voltage using an inductor... | 12/26/2006 |
| 7112897 | Capacitor and switch components cooperation to maintain input voltage to target circuit at or above cut-off voltage until power circuit is able to maintain the input voltage An apparatus in one example comprises a first capacitor component, a second capacitor component, and a switch component. The first capacitor component, the second capacitor component, and the switch component cooperate to maintain an input voltage to a target circui... | 09/26/2006 |
| 7026795 | Method for pulse modulation control of switching regulators A method for pulse modulation control of switching regulators includes positioning a series of parallel FET-type switches (high-side switches) between the input side of an inductor and the voltage supply. A second parallel series of FET-type switches (low-side switc... | 04/11/2006 |
| 7005867 | Power supply circuit and testing device A power supply circuit is provided that supplies a voltage to a load. The power supply circuit includes a power supply for generating a predetermined voltage; an electrical path for electrically connecting the power supply and the load to each other; a current draw ... | 02/28/2006 |
| 6885177 | Switching regulator and slope correcting circuit A switching regulator has an input terminal for receiving an input voltage, an output terminal for outputting an output voltage, a coil connected between the input terminal and the output terminal, and a slope correcting circuit for outputting a signal adapted to ca... | 04/26/2005 |
| 6838916 | Method of generating a voltage ramp at the terminals of a capacitor, and corresponding device A ramp capacitor CAP1 has a first terminal connected to a power supply voltage VBAT. A generator circuit is connected to a second terminal of the ramp capacitor and adapted to generate a voltage ramp at the terminals of the ramp capacitor. The generator circu... | 01/04/2005 |
| 6806448 | Induction heating device with a switching power source and image processing apparatus using the same An induction heating device includes a plurality of induction coils connected to a single high-frequency power source and each being able to be ON/OFF controlled by a switch. A current is selectively fed only to desired part of the induction coils or to all of the i... | 10/19/2004 |
| 6731258 | Fast-working LCD residual display suppression circuit and a method thereto The invention relates to a fast-working residual display suppression circuit for LCD and a method thereto. The method includes the following steps: receiving a control signal; if the control signal is an automatic control signal, comparing a first reference voltage ... | 05/04/2004 |
| 6600296 | Method and semiconductor die with multiple phase power converter An on-die multiple phase power converter reduces output voltage ripple and reduces input current ripple while allowing for higher input voltage and reduced input current to a circuit board. The on-die multiple phase power converter also allows for more th... | 07/29/2003 |
| 6597157 | Parallel phased switch control An integrated circuit controller for power conversion systems that provides for the control of parallel phased semiconductor switches without the need for separate filter inductors for each switch. The controller derivates two phased clock signals from a ... | 07/22/2003 |
| 6559625 | Circuit arrangement and electrical appliance with an inductive load and a buck converter The invention is directed to a circuit arrangement with an inductive load and a buck converter, wherein the inductive load serves as coil, as well as to an electrical appliance with such a circuit arrangement.... | 05/06/2003 |
| 6531854 | Power factor correction circuit arrangement A power factor correction circuit arrangement. A rectified alternating-current (AC) input signal may be applied across inputs of a voltage converter circuit, such as a boost converter. Current drawn by the voltage converter may be sensed to form a first s... | 03/11/2003 |
| 6154473 | Power supply apparatus for laser A main power supply unit 10 of this power supply apparatus for laser comprises asingle-phase rectifying circuit 16 for receiving a single-phase AC voltage EA at a commercial frequency to convert (rectify) it into a direct current, a capacitor 1... | 11/28/2000 |
| 5959440 | Load control device for an AC circuit A motor controlling device for controlling the rotational speed of an AC motor (3) connected with an AC power supply (1) through a speed control thyrister (2) includes a negative charging circuit (5) for charging a negative half cycle voltage of the AC po... | 09/28/1999 |
| 5894243 | Three-pin buck and four-pin boost converter having open loop output voltage control A controlled output voltage is provided for a switching mode power converter operating in the continuous conduction mode without requiring a feedback path coupled to monitor the output voltage. Instead, a voltage related to the input voltage is monitored.... | 04/13/1999 |
| 5825827 | Dynamically compensated linear regulator for pulsed transmitters A system to alter the voltage supplied to the linear regulator of a pulsed transmitter in accordance with the temperature of the regulator, the minimum voltage required for a transmission and the specific aircraft installation requirements so as to reduce... | 10/20/1998 |
| 5777503 | Pulse width modulation bias to minimize effect of noise due to ramp switching A control system using pulse width modulation, current-mode control to regulate a flyback converter for small input currents. The control system generates a ramp voltage indicative of an input current of the converter with an added bias to overcome the ef... | 07/07/1998 |
| 5757169 | Electric circuit for pulse energized electrostatic precipitator and pulse energized electrostatic precipitator using this circuit An electrostatic precipitator circuit has an input terminal supplied DC voltage, an output terminal connected to a precipitating capacitor, a storage capacitor connected between ground potential and the input terminal, and a recovery capacitor whose one e... | 05/26/1998 |
| 5691628 | Regulation of current or voltage with PWM controller A circuit for providing a periodic output having a regulated magnitude is derived from a periodic input source. A switch is serially connected to the input for periodically sampling the input at a sampling frequency which is much higher than the frequency... | 11/25/1997 |
| 5672941 | Inductorless controlled transition light dimmers optimizing output waveforms Lamp dimmers are disclosed in which, in the course of varying average power supplied to the lamp load, the semiconductor power control devices transition between one and the other of substantially conductive and non-conductive power conditions, the durati... | 09/30/1997 |
