Did You Know...
...that the Band-Aid Bandage was invented by a Johnson & Johnson employee whose wife had cut herself? Earl Dickson's wife was rather accident prone, so he set out to develop a bandage that she could apply without help. He placed a small piece of gauze in the center of a small piece of surgical tape, and what we know today as the Band Aid bandage was born!
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| Number | Title | Issue Date |
| 8183787 | Power supply systems with controllable power A power supply system includes a power converter, a switch, and a controller. The power converter is operable for providing power to a load. The switch is coupled to the power converter and is operable for adjusting the power to the load. The switch has a gate, a so... | 05/22/2012 |
| 8174199 | Discharge lamp lighting apparatus, method for controlling the same, and projector A discharge lamp lighting apparatus includes a power control circuit that outputs a DC current, an AC conversion circuit to which the DC current is inputted, the AC conversion circuit repeatedly reversing the polarity of the DC current between a first polarity and a... | 05/08/2012 |
| 8159141 | Methods and apparatus for driving discharge lamps Methods and apparatus for driving discharge lamps are disclosed herein. In one embodiment, a method for driving a discharge lamp includes generating a switching signal to drive a discharge lamp, monitoring a working status of the discharge lamp, and determining whet... | 04/17/2012 |
| 8154212 | Circuit for driving light sources and related method A circuit for supplying a light source (L) such as a high flux (HF) LED with Pulse Width Modulation (PWM) dimming capability includes: a rectifier (10) for receiving an input bipolar PWM modulated signal (v) representative of a desired dimming level for the l... | 04/10/2012 |
| 8143794 | Low voltage light source driving circuit A low voltage LED (Light Emitting Diode) driving circuit operates under low supply voltage to provide stable and reliable control of LEDs. The LED driving circuit includes a switching transistor to turn on or off an output current in the LED. The LED driving circuit... | 03/27/2012 |
| 8134301 | Step-up driver with minimal switching frequency The invention relates to an electronic ballast comprising a step-up converter for operating a discharge lamp. The electronic ballast is embodied in such a way as to disconnect a switching element (T1) in the step-up converter when a maximum current value of t... | 03/13/2012 |
| 8129914 | Operating circuit for light-emitting diodes An operating circuit for at least one light-emitting diode (LED) incorporates a switched-mode regulator circuit to which a DC voltage is fed and which provides a supply voltage for the at least one light-emitting diode (LED) by means of a coil (L1) and a swit... | 03/06/2012 |
| 8120263 | Portable lighting device and method thereof A portable lighting device includes a power source, a controller, and a load. The controller comprises a power input terminal which is electrically connected to the power source via a switch. The load is electrically connected to a power output terminal of the contr... | 02/21/2012 |
| 8115402 | Method and apparatus for driving multiple parallel discharge lamps The present invention provides a method and apparatus for driving multiple parallel discharge lamps, which increases the switching frequency once the open lamp condition is detected to provide an output voltage that is high enough to ignite the lamp again. ... | 02/14/2012 |
| 8110998 | Multi-pulse ignition circuit for a gas discharge lamp An ignition circuit for igniting a gas discharge lamp generates a high voltage gas breakdown pulse by building up a current through a primary winding of a transformer. After a predetermined period and thus when a predetermined current flows through the primary windi... | 02/07/2012 |
| 8102128 | Driving method and driving device for discharge lamp, light source device, and image display device A driving method for a discharge lamp that lights by performing discharge between two electrodes while alternately switching a polarity of a voltage applied between the two electrodes includes: modulating an anode duty ratio, which is a ratio of an anode time for wh... | 01/24/2012 |
| 8093821 | Driving method for improving luminous efficacy of a light emitting diode A driving method for improving luminous efficacy of a light emitting diode (LED), the method comprising: periodically switching a DC current supplied to the LED between a high current level lH and a low current level lL, the low current level l... | 01/10/2012 |
| 8084952 | Method and system to detect zero current conditions in an electronic ballast by monitoring voltage across a buck inductor The invention discloses a method and system to detect zero current conditions in a buck inductor by monitoring the voltage across the buck inductor. Once zero current and voltage conditions are present, an inverter circuit changes the operational state, i.e. conduct... | 12/27/2011 |
| 8084951 | Inverter and liquid crystal display device including the same Disclosed is a liquid crystal display panel which includes a switching circuit for converting an input voltage into an alternating current (AC) voltage, a transformer for boosting the AC voltage generated from the switching circuit, and a bypass capacitor part conne... | 12/27/2011 |
| 8076862 | Dimmer protection A lighting installation comprises (a) a lighting load, powered by an AC power supply, said AC power supply having a cycle having a period; and (b) a dimmer comprising a first semiconductor switch operable by the action of a switching voltage to switch a current to t... | 12/13/2011 |
| 8076861 | Driving method and driving device for discharge lamp, light source device, and image display device A method for driving a discharge lamp that lights by performing discharge between two electrodes while alternately switching a polarity of a voltage applied between the two electrodes includes: modulating an anode duty ratio, which is a ratio of an anode time for wh... | 12/13/2011 |
| 8072154 | Device for supplying power to LED diodes A device for supplying diodes LED includes an electric bridge (ABHG) with input terminals (A, B) and output terminals (H, G), including diodes (DS1, DS2) interposed between branches (AH, BH), with cathodes turned toward the terminal (H); Two MO... | 12/06/2011 |
| 8058809 | Circuits and methods for balancing current among multiple loads A circuit comprises a power tank, a pair of transformers and multiple loads. The power tank converts a DC input voltage to an AC voltage. The pair of transformers comprise a pair of primary windings and a pair of secondary windings and transform the intermediate AC ... | 11/15/2011 |
| 8058810 | Method and system for high efficiency, fast transient multi-channel LED driver System and method for a light emitting diode (LED) driver are disclosed. To supply an LED bus voltage to a large array of LEDs organized in multiple channels where one or more LEDs are connected in series in each channel, an LED driver includes a power converter, a ... | 11/15/2011 |
| 8040070 | Frequency converted dimming signal generation There is provided a lighting control circuit comprising a duty cycle detection circuit, an averaging circuit, a waveform generator and a comparator circuit. The duty cycle detection circuit generates a first periodic waveform having a duty cycle and frequency corres... | 10/18/2011 |
| 8022635 | CCFL controller with multi-function terminal A cold cathode fluorescent lamp controller exhibiting a multi-function terminal and operative alternately in a strike mode and a run mode, the controller comprising: a phase locked loop arranged for synchronization of an oscillator, associated with the controller, w... | 09/20/2011 |
| 8018173 | Ballasts for fluorescent lamps Circuits are disclosed, for example for driving fluorescent lamps, and such circuits may form part of a ballast. First and second sensing circuits can apply respective signals to a control circuit as a function of an end-of-lamp life condition and of the number of r... | 09/13/2011 |
| 7994727 | LED driving arrangement A circuit for driving LEDs includes: —a transformer with a secondary winding for driving the LEDs and a primary winding, —a half-bridge arrangement fed with an input voltage and coupled to the transformer, —a resonant circuit between the half-bridge arrangemen... | 08/09/2011 |
| 7986102 | Adjustable color solid state lighting A multi-channel light source has different channels for generating illumination of different channel colors corresponding to the different channels. An electrical power supply selectively energizes the channels using time division multiplexing to generate illuminati... | 07/26/2011 |
| 7952293 | Power factor correction and driver circuits Power factor correction and driver circuits and stages are described. More particularly, power factor correction circuits are described that utilize an auxiliary inductor winding for power regulation. Driver circuits configured for electrical loads such as series ar... | 05/31/2011 |
| 7944149 | Starting an electronic ballast A ballast including an H-bridge type inverter for driving a lamp and a filter circuit that includes a buck inductor is disclosed. The buck inductor is a primary winding of a transformer, and a secondary winding of the transformer provides power to a controller of th... | 05/17/2011 |
| 7923938 | System and method for providing inductive power to improve product marking and advertising A system and method are described in which power is inductively supplied to a product or a package containing a product. This power is received via a coil and used by a light source to further enhance the presentation of the product or packaging. The illuminated lig... | 04/12/2011 |
| 7915833 | Single-ended DC to AC power inverter An inverter comprising a low-side switching element in series with a first primary winding; a high-side switching element in series with a second primary winding, where the combination of the low-side switching element and first primary winding is connected in paral... | 03/29/2011 |
| 7902762 | System and method for driving LED with high efficiency in power consumption A system and method for driving a LED is disclosed. The system is switched in turn between a constant-current mode circuit and a constant-voltage mode circuit. Accordingly, the forward voltage of the LED could be maintained constant, and the efficiency in power cons... | 03/08/2011 |
| 7898185 | Current controlled driver Various current controlled driver apparatuses are disclosed herein. For example, some embodiments of the present invention provide a current controlled driver including a control circuit having a current input and a driver circuit having a power input. The control c... | 03/01/2011 |
| 7852012 | Circuit apparatus with a high-side buck transistor A cost-effective driver circuit for an LED background lighting unit includes a buck circuit with an upper transistor is driven via two further transistors. The first transistor is connected with its reference electrode to the positive terminal of a DC voltage source... | 12/14/2010 |
| 7825604 | Drive circuit supplying current to load based on control signal, and portable information terminal including the same A drive circuit (100) includes an operational amplifier (OP1) that compares a voltage applied to an inverting input terminal with a reference voltage applied to a non-inverting input terminal, a MOS transistor (M1) that has an output connected t... | 11/02/2010 |
| 7825603 | Lighting assembly and method of operating a discharge lamp A lighting assembly, a driver circuit, and a method of operating a discharge lamp are described. A discharge lamp (10) comprises a discharge vessel (14) with at least two electrodes (16) arranged at a distance d for generating an arc between the... | 11/02/2010 |
| 7812544 | Fluorescent light control Circuitry, which is compatible with incandescent light dimmers, is disposed within the screwbase of a compact fluorescent light, and sets driving frequencies for a mercury plasma, based, at least in part, on sensing the duty cycle of the incoming AC supply waveform.... | 10/12/2010 |
| 7791282 | Motion sensor switch for 3-way light circuit and method of lighting control using the same Systems and methods are provided for controlling light in a 3-way light circuit, where at least one of the switches in a 3-way light circuit includes an occupancy sensor and the on/off state of the load in the 3-way circuit is determined based on the voltage output ... | 09/07/2010 |
| 7777421 | Light emitting device An object of the invention is to suppress the amount of heat generated by a light emitting diode and prevent the light emitting diode from being overheated without reducing the amount of emitted light even when the light emitting diode is a high-power light emitting... | 08/17/2010 |
| 7777422 | DC/DC converter device and discharge lamp lighting device A DC/DC converter device according to the present invention includes a plurality of resonant DC/DC converters connected in parallel, and a timing control circuit driving the plurality of resonant DC/DC converters at substantially the same frequency with a phase shif... | 08/17/2010 |
| 7733030 | Switching power converter with controlled startup mechanism A switching power converter with a controlled startup mechanism includes a switching stage which provides a voltage Vout at an output node in response to a switching control signal, with the output node adapted for connection to a non-linear load. A feedb... | 06/08/2010 |
| 7728527 | Energy saving power supply circuit A power supply circuit includes a power supply input for receiving power from a power supply, a power supply output for supplying power to a load, a voltage reference circuit, and a switch circuit. The voltage reference circuit is connected between the power supply ... | 06/01/2010 |
| 7705543 | Supply device of circuit branches with LED diodes A device includes at least two circuit branches, each of said at least two circuit branches comprising at least one LED diode. The device comprises a supply circuit that provides an electric supply of said at least two circuit branches and includes a variable resist... | 04/27/2010 |
