Famous Patents
3M employee and church chorister Art Fry needed something to temporarily mark pages in his hymnal. He was in luck because his colleague, Spencer Silver, accidentally developed a glue that was too weak for other purposes. After initially discouraging consumer response, Post-it Notes became a hit in 1979.
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| Number | Title | Issue Date |
| 8188671 | Power factor control for an LED bulb driver circuit A light-emitting diode (LED) bulb has a shell and a base attached to the shell. An LED is within the shell. A driver circuit provides current to the LED. The driver circuit has a power factor control circuit that includes a tracking circuit configured to produce a t... | 05/29/2012 |
| 8179053 | Power supply for an LCD display A power supply system is provided for a multiple lamp LCD panel. In one aspect, the power supply includes a plurality of transformers for driving a plurality of respective CCFLs. The primary sides of each transformer are coupled in series to thereby reduce the stres... | 05/15/2012 |
| 8179054 | LED power supply An LED power supply (LPS) (10) that is designed to replace conventional fluorescent lamps, which also include Compact Fluorescent Lamps (CFLs). The LPS (10) is comprised of three major elements: a power input circuit (PIC) (12), an LED Power Con... | 05/15/2012 |
| 8174201 | Self-oscillating transformerless electronic ballast An electronic ballast includes a rectifier circuit having a first output terminal for coupling with a lamp; a first inductor coupled with a first node; a resonant network coupled with the first node; a first capacitor coupled with the first node; a first resistor co... | 05/08/2012 |
| 8169149 | Circuit arrangement and method for the operation of at least one discharge lamp Circuit arrangement for operation of discharge lamp comprising an input for connecting a supply alternating current voltage. A startup supply device is provided with an input and an output, where the input is connected to an input of a control circuit and the output... | 05/01/2012 |
| 8143795 | Circuit arrangement for firing a discharge lamp A circuit arrangement for starting a discharge lamp, comprising: a first and a second input terminal for connecting an input voltage; an inverter, which has an input and an output, the input being coupled to the first and the second input terminal; a first and a sec... | 03/27/2012 |
| 8143797 | DC/AC inverter A direct current to alternating current (DC/AC) inverter is for driving a fluorescent lamp through quasi sine wave generation. The DC/AC inverter includes a frequency generator for generating a reference signal and a modulation signal, a pulse width modulator couple... | 03/27/2012 |
| 8143796 | Electronic ballast with controlled filament preheating using half-wave lamp current detection An electronic ballast is provided for controlled preheating of filaments in a discharge lamp. A power converter has a plurality of switching elements and converts DC power from a DC power source into AC power for the lamp. A starting circuit generates a high voltage... | 03/27/2012 |
| 8138681 | Driving circuit, LED head and image forming apparatus In a driving circuit, a drive transistor supplies drive electric current to record elements to construct an array, and a reference electric current generating circuit that provides a control voltage to the drive transistor and controls the drive electric current, wh... | 03/20/2012 |
| 8138682 | Symmetrical RF power supply for inductively coupled electrodeless lamps A radio frequency (RF) power supply for an electrodeless lamp includes a pair of DC rails, an RF inverter having power input terminals connected between the rails, a first inductor arranged to inductively couple with an electrodeless lamp, first and second resonance... | 03/20/2012 |
| 8129915 | Discharge lamp operating device, illumination device and liquid crystal display device A series circuit comprising a diode and a resistance is connected in parallel to a filament, and a series circuit comprising a diode and a resistance is connected in parallel to a filament. The filaments are preheated by a preheating current supplied from secondary ... | 03/06/2012 |
| 8125156 | Circuit arrangement for operating at least one high-pressure discharge lamp A circuit arrangement for operating at least one high-pressure discharge lamp (16), has four switches (Q1 to Q4) in a full-bridge arrangement (14), a first and a second switch (Q1, Q2) forming the first half-... | 02/28/2012 |
| 8120266 | Driving circuit for driving a load A driving circuit comprises a first and a second switching circuit coupled in parallel to a node which is adapted to be coupled to a load, a first and a second detecting circuit, and a synchronizing circuit having an input coupled to the first and second detecting c... | 02/21/2012 |
| 8120264 | Discharge lamp lighting circuit A discharge lamp lighting circuit for supplying an AC power to a discharge lamp includes first and second converters for receiving a DC voltage and stepping up the voltage. A controlling circuit drives the first and second converters CON1, CON2 alterna... | 02/21/2012 |
| 8120265 | Lamp driver for operating a gas discharge lamp A lamp driver circuit for operating a gas discharge lamp (La) is proposed, which comprises a switched mode power supply circuit (SMPS) and a first and a second output terminal (OT1, 0T2) for supplying a lamp current to the gas discharge lamp (La). The ... | 02/21/2012 |
| 8093822 | LED driver and control method thereof An LED driver providing an LED lighting current to an LED path, extracts the LED lighting current information from the LED path to produce a first signal including an AC component and a DC component, and extracts the DC component information of the first signal to p... | 01/10/2012 |
| 8063570 | Simple protection circuit and adaptive frequency sweeping method for CCFL inverter A CCFL inverter circuit integrates a feedback circuit and protection circuit together. For both in-phase and out-of-phase applications, sensed lamp voltages can be used for open lamp and short lamp detection and sensed currents can be used for open lamp detection. T... | 11/22/2011 |
| 8063571 | Bi-directional light emitting diode drive circuit in bi-directional divided power impedance The present invention uses the mutually series connected resistive, or inductive, or capacitive impedance to divide the voltage of bi-directional power source, thereby using the divided power of the impedance component to drive the bi-directional conducting light em... | 11/22/2011 |
| 8063572 | High-pressure discharge lamp lighting device The high-pressure discharge lamp lighting device of the invention includes a lighting circuit for supplying an alternating current to a high-pressure discharge lamp to cause lighting, the high-pressure discharge lamp having an arc tube in which a halogen material is... | 11/22/2011 |
| 8058812 | Buck-mode boost converter with regulated output current An LED driver circuit that includes a buck-mode boost converter that provides a regulated output current and that requires only a single connection to each channel of LEDs. The buck-mode boost controller may include a current regulator that includes an integrator. T... | 11/15/2011 |
| 8058811 | HID lamp ballast circuit A ballast circuit operable to drive a high intensity discharge lamp in accordance with an embodiment of the present applications includes an energy conversion circuit operable to convert an input voltage into a bus voltage and to provide the bus voltage to a DC bus,... | 11/15/2011 |
| 8049430 | Electronic ballast having a partially self-oscillating inverter circuit An electronic ballast for driving a gas discharge lamp comprises an inverter circuit that operates in a partially self-oscillating manner. The inverter circuit comprises a push-pull converter having a main transformer having a primary winding for producing a high-fr... | 11/01/2011 |
| 8044602 | Method of driving discharge lamp, driving device, and projector A method for driving a discharge lamp that supplies an AC current to a discharge lamp having a first electrode and a second electrode so as to produce discharge and to cause the discharge lamp to emit light includes, during a steady operation in which the AC current... | 10/25/2011 |
| 8044603 | Light emitting diode driving device and light system A light emitting diode driving device and light system are provided. The light emitting diode driving device drives a light source by a received alternating current voltage. The light emitting diode driving device includes a rectifier, a feedback unit, a protection ... | 10/25/2011 |
| 8040071 | Circuits and methods for driving light sources In one embodiment, a driving circuit includes an AC/DC converter which converts an AC voltage to a DC voltage and a DC/DC linear regulator which regulates a current through, e.g., an LED light source, according to a first current reference if a monitoring signal ind... | 10/18/2011 |
| 8035308 | Software controlled electronic dimming ballast A software controlled electronic dimming ballast for preheating, striking, and varying the dimming level of a lamp. In one embodiment, the ballast includes an EMI filter circuit, an AC/DC converter circuit, a PFC circuit, an inverter circuit, and a software controll... | 10/11/2011 |
| 8030852 | Light driver circuit device and backlight device A light driver circuit device for synchronously driving a plurality of cold cathode fluorescent lamps (CCFLs) is provided. The light driver circuit device includes an inverter circuit board and a balance circuit board. The inverter circuit board has an inverter circ... | 10/04/2011 |
| 8022637 | Method for detection of non-zero-voltage switching operation of a ballast of fluorescent lamps, and ballast A method detects a non-zero-voltage switching operation of a lamp ballast, the lamp ballast including a half-bridge circuit with a first and a second semiconductor switching element, a resonant circuit connected to the half-bridge circuit, and a snubber capacitance ... | 09/20/2011 |
| 8018174 | Safety circuit for electro-luminescent lamp ballast A safety circuit is provided for a ballast of an electro-luminescent (EL) lamp. The EL lamp had an electrical ground shield on at least a portion thereof and has a separate ground lead. The ballast is an isolated ballast with a line input being isolated from an outp... | 09/13/2011 |
| 8008866 | Hybrid light source A hybrid light source comprises a high-efficiency lamp, for example, a fluorescent lamp, and a low-efficiency lamp, for example, a halogen lamp. A control circuit individually controls the amount of power delivered to each of the high-efficiency lamp and the low-eff... | 08/30/2011 |
| 7999481 | Lighting method for a high-pressure discharge lamp, lighting circuit for a high-pressure discharge lamp, high-pressure discharge lamp apparatus, and projector-type image display apparatus After startup, a lighting method for a high-pressure discharge lamp is to light the lamp at a rated frequency without switching the frequency for 120 seconds (S12, S13), and thereafter to switch from the rated frequency to a more audible frequency in a... | 08/16/2011 |
| 7999482 | Lighting of discharge lamp by frequency control A discharge lamp controlling apparatus includes a detector for detecting a discharge condition of a discharge lamp; a frequency changing unit for gradually changing a frequency of a voltage to be applied to the discharge lamp until the discharge condition reaches a ... | 08/16/2011 |
| 7994728 | Boost driver circuit with fast discharging function The present invention discloses a boost driver circuit which converts an input voltage to an output voltage and supplies it to a load, the boost driver circuit comprising: a power transistor electrically connected with a node between the input voltage and the output... | 08/09/2011 |
| 7982405 | Igniter circuit for an HID lamp An igniter circuit (10) for an HID lamp (11) has a DC input (VBUS) for coupling to a source of DC voltage, and an output (23, 24) for coupling to the HID lamp. A resonant ignition circuit (12) operating at a controlled resonant frequency ... | 07/19/2011 |
| 7973488 | Constant current driver circuit with voltage compensated current sense mirror A current sensing circuit for sensing the current provided to LEDs by a constant current power source includes a resistive shunt in series with the load and a current mirror having a first leg connected to a first terminal of the resistive shunt and a second leg con... | 07/05/2011 |
| 7973487 | Power supply circuit A power supply circuit is proposed for supplying current to a pair of white LEDs connected in series. The circuit comprises a DC-DC power converter, with a charge pump coupled to the output of the DC-DC power converter. A super capacitor is coupled to the charge pum... | 07/05/2011 |
| 7952294 | Apparatus, system and method for cascaded power conversion An apparatus method and system are provided for power conversion, to supply power to a nonlinear load such as a plurality of light emitting diodes. An exemplary apparatus comprises a first power converter stage, a second power converter stage, a plurality of sensors... | 05/31/2011 |
| 7952295 | Illuminating device To a constant-current power supply whose output current can be variably set, light emitting modules can be connected in parallel. A control unit recognizes connection information outputted from an information output unit provided in each of the light emitting module... | 05/31/2011 |
| 7952296 | Feedback circuit for DC/AC inverter A feedback circuit is utilized in a DC/AC inverter having a first power switch and a second power switch for driving a fluorescent lamp. The feedback circuit includes a protection circuit for disabling the first power switch and the second power switch when no fluor... | 05/31/2011 |
| 7944150 | Discharge lamp lighting apparatus and projector A discharge lamp lighting apparatus for turning on a discharge lamp has a lighting condition in which a projection is formed at a tip of an electrode for electric discharge. In the discharge lamp lighting apparatus, when the polarity-reversal mode is the second mode... | 05/17/2011 |
