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| Number | Title | Issue Date |
| 8129916 | Light emitting driver circuit with bypass and method A light emitting driver circuit, system, and method are provided. The driver circuit system and method can be implemented in various ways. An embodiment includes a bypass circuit which diverts current from the LEDs whenever a switch coupled to the LEDs incurs residu... | 03/06/2012 |
| 8053999 | HID ballast A method and apparatus are disclosed for providing current to a load. The apparatus includes a full or half bridge switching circuit, including at least one switching element for supplying power to a load when switched on and means for switching a state of the switc... | 11/08/2011 |
| 7982406 | Active lamp current crest factor control Ballasts with crest factor control are provided. During a transition to a given half cycle steady state, the current provided to reach the steady state is varied, such as turned off for a short period. This reduction during the transition may reduce or eliminate ove... | 07/19/2011 |
| RE42425 | Dimmer having a power supply monitoring circuit A two-wire dimmer for control of a lighting load from an alternating-current (AC) power source includes a semiconductor switch, a power supply, and a control circuit. The power supply includes an energy storage input capacitor that is able to charge only when the se... | 06/07/2011 |
| 7768212 | LED driver and circuit for controlling a power switch to provide a driving voltage to at least one LED An LED driver circuit and its control circuit for controlling its power switch are provided. The LED driver includes a switch, a PWM controller, a current source and a signal controller. The switch has a first end outputting a driving voltage to at least one LED. Th... | 08/03/2010 |
| 7755298 | Power supply circuit with soft start circuit An exemplary power supply circuit (20) includes a scaler (21), a field-effect transistor (23), a pulse width modulation circuit (25), and a capacitor (29). The scaler includes an output port (213). The pulse width modulation... | 07/13/2010 |
| 7474063 | Anti-cycling control system for luminaires An anti-cycling luminaire control system may detect repeated lamp-off conditions and interrupt power to the lamp and provide an indication of lamp cycling after a predetermined number of lamp-off conditions has been detected. The control system also provides a cool-... | 01/06/2009 |
| 7443106 | Circuit with switch-off device for the operation of light sources Circuit with a switch-off device for the operation of light sources The invention relates to a circuit with a switch-off device for the operation of light sources (Lp), have the following features: a self-commutated half-bridge inv... | 10/28/2008 |
| 7429830 | Power control of a fluorescent lamp A fluorescent lamp (2), in particular a backlight lamp of a display device, is supplied with an alternating voltage, a frequency and an amplitude of which being greater during ignition than during normal operation of the lamp. The voltage (V) across the lamp ... | 09/30/2008 |
| 7420333 | Mixed mode control for dimmable fluorescent lamp A mixed mode control for dimmable fluorescent lamp provides a smooth and continuous control of output of the lamp. A load threshold, below which the output of the discharge lamp could not be effectively controlled by the conventional frequency control, is determined... | 09/02/2008 |
| 7417382 | High-efficiency adaptive DC/AC converter A CCFL power converter circuit is provided using a high-efficiency zero-voltage-switching technique that eliminates switching losses associated with the power MOSFETs. An optimal sweeping-frequency technique is used in the CCFL ignition by accounting for the parasit... | 08/26/2008 |
| 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 |
| 7397196 | Circuit arrangement for preventing high peak currents A driver for HID lamps includes four switches and generates a constant DC-current that is commutated at a low frequency. The driver includes a filter capacitor. The occurrence of peak currents due to the charging or discharging of the filter capacitor is prevented b... | 07/08/2008 |
| 7394212 | Inverter and inverter unit thereof An inverter unit including a converter, a transformer, a feedback circuit and an open lamp lock circuit is provided. The converter receives a drive signal, and outputs a duty voltage signal accordingly. The transformer is selectively coupled with a lamp of a display... | 07/01/2008 |
| 7388335 | Apparatus for providing a sinusoidally amplitude-modulated operating voltage, lighting system and method for generating an amplitude-modulated voltage In the case of an apparatus for providing a sinusoidally amplitude-modulated operating voltage, two switches are arranged in the form of a half bridge, and an LC element is arranged downstream of the half bridge. The first switch is driven by a first square-wave sig... | 06/17/2008 |
| 7382093 | Device for operation of a discharge lamp of the short arc type A device for operating a discharge lamp of the short arc type having a feed device which supplies a direct current to the discharge lamp when operation starts and an alternating current afterwards, in which the feed device supplies a direct current which is smaller ... | 06/03/2008 |
| 7372214 | Apparatus and method for driving lamp of liquid crystal display device A lamp driving apparatus of a liquid crystal display includes a plurality of lamps arranged with a predetermined distance between adjacent lamps; a comparator to compare output voltages of lamps that are separated by more than the lamp distance; and a power intercep... | 05/13/2008 |
| 7372215 | Lamp ballast for circuit driving multiple parallel lamps A lamp ballast circuit for driving, e.g. four flourescent lamps with a ballast control IC such as the IR2167 Ballast Control IC. The circuit includes a lamp replacement detection circuit for detecting insertion of a lamp, and in response, controlling the ballast con... | 05/13/2008 |
| 7368916 | Apparatus and methods for making capacitive measurements of cathode fall in fluorescent lamps Apparatus and methods for measuring cathode fall in fluorescent lamps are disclosed. Together with measurements of cathode temperature, such measurements of cathode fall may inform a determination of cathode heater voltage as a function of discharge current (i.e., a... | 05/06/2008 |
| 7368878 | Current-mode resonant ballast A lower-cost ballast circuit for fluorescent lamps is provided. A resonant circuit is formed by a series connection of an inductor and a capacitor to operate the fluorescent lamp. A first circuit and a second circuit are coupled to switch the resonant circuit. Takin... | 05/06/2008 |
| 7368879 | Pendulum resonant converter and method A resonant switching converter comprising a first pair of series connected switches comprising a high side switch and a low side switch coupled across a DC input voltage, there being a first switched node between the switches; a second pair of series connected switc... | 05/06/2008 |
| 7364338 | Systems for providing backlight module with stacked light source A system for providing a backlight module has a light guide plate and at least a light source set positioned adjacent to the incident surface. The light source set contains a plurality of light sources stacking along a direction parallel with the incident surface of... | 04/29/2008 |
| 7362059 | Driving unit of fluorescent lamp and method for driving the same A fluorescent lamp driving unit includes fluorescent lamps, wherein each fluorescent lamp includes a first end and a second end opposing the first end; an inverter for driving the plurality of fluorescent lamps to emit light; and a controller for electrically connec... | 04/22/2008 |
| 7352134 | Lamp containing fixed reverse phase switching power supply with time-based phase pulse triggering control A lamp contains a lamp voltage conversion circuit within the lamp and connected to a lamp terminal. The voltage conversion circuit includes a phase-control clipping circuit that clips a load voltage and provides an RMS load voltage to the lamp. The phase-control cli... | 04/01/2008 |
| 7348734 | Method for protecting a ballast from an output ground-fault condition A method (700) for protecting a ballast from an output ground-fault condition includes the steps of applying power to the ballast (step 710), providing a startup delay period for a DC-to-DC converter (step 730), monitoring a voltage across a DC ... | 03/25/2008 |
| 7348959 | Liquid crystal display device A liquid crystal display device including: a signal converter which converts a selectively input analog image signal into a digital image signal according to a sampling clock; a scaler which samples the digital image signal output by the signal converter, to render ... | 03/25/2008 |
| 7332867 | Apparatus and method for driving lamp of liquid crystal display device A lamp driving apparatus of a liquid crystal display device and method of driving lamps in a liquid crystal display are described. The lamp driving apparatus includes lamps that irradiate a liquid crystal display panel with light. An inverter receives a DC voltage f... | 02/19/2008 |
| 7323826 | Anti-cycling control system for luminaires An anti-cycling luminaire control system may detect repeated lamp-off conditions and interrupt power to the lamp and provide an indication of lamp cycling after a predetermined number of lamp-off conditions has been detected. The control system also provides a cool-... | 01/29/2008 |
| 7323832 | Inverter with dimming function A control circuit for an inverter for driving a fluorescent lamp includes a first triangular wave signal generator for use in analog dimming control, and a second triangular wave signal generator for use in burst dimming. The first triangular wave signal generator o... | 01/29/2008 |
| 7321206 | LED driving apparatus An apparatus for driving an LED is provided. The driving apparatus may have an LED unit including at least one LED, and a current controlling unit for controlling the magnitude of current flowing through the LED unit in response to a control signal. The LED driving ... | 01/22/2008 |
| 7315130 | Switching control for inverter startup and shutdown An electronic ballast circuit for a lamp is described, wherein the ballast comprises a power factor correction circuit coupled to an inverter circuit. The inverter circuit is further coupled to a trigger circuit, which is in turn operatively connected to a hot or ne... | 01/01/2008 |
| 7312588 | Ballast with frequency-diagnostic lamp fault protection circuit A ballast (20) for powering one or more gas discharge lamps (70,72,74,76) comprises an inverter (200) and a lamp fault protection circuit (400). Inverter (200) has an operating frequency that is load-dependent. Lamp fault protectio... | 12/25/2007 |
| 7312970 | Low cost surge protection A motor drive for an electric machine includes a live line, a second line, and a ground line. A surge protector includes a first varistor and a gas discharge tube (GDT) that is non-conductive below a trigger voltage and that is conductive above the trigger voltage. ... | 12/25/2007 |
| 7310214 | Inductive output tube (IOT) control circuit A power supply for an RF transmitting tube while protecting the tube from a high voltage arc event. The supply includes a rectifier circuit configured to be connected to an AC voltage supply and having an output circuit that supplies a DC voltage to a load including... | 12/18/2007 |
| 7288898 | Automotive high intensity discharge lamp ballast circuit An electronic ballast for driving a high intensity discharge (HID) lamp is provided. The electronic ballast includes a voltage boost stage for receiving a DC input voltage and outputting a boosted DC output voltage with a controlled current. It further includes a sw... | 10/30/2007 |
| 7281807 | Positionable projection display devices Described herein are devices that provide projection-type video output in a portable and flexible design. The design includes a projection chamber, a base, and an interface that permits relative positioning between the projection chamber and base. The base maintains... | 10/16/2007 |
| 7280338 | Power supply circuit, back-pack power supply module and circuit interrupter including the same A back-pack power supply module is for a circuit interrupter including an elongated line conductor. The back-pack power supply module includes a housing having an opening therethrough. The opening receives the elongated line conductor, which passes through the openi... | 10/09/2007 |
| 7279853 | Fluorescent lamp dimmer control A dimmer fixture has a ballast board 10, a main board 40 and switch 70. The ballast board and main board have no inductors so the fixture may be used for fluorescent and incandescent lamps. The ballast board 10 has two bridge circuits ... | 10/09/2007 |
| 7279854 | Charge pump interface circuit A ballast circuit including a charge pump interface circuit is disclosed to provide a method of isolating a switch from a power line used to power a ballast for supplying electrical power to a lamp. In addition, the charge pump interface circuit provides a method to... | 10/09/2007 |
| 7279851 | Systems and methods for fault protection in a balancing transformer An apparatus and methods for balancing current in multiple negative impedance gas discharge lamp loads. Embodiments advantageously include balancing transformer configurations that are relatively cost-effective, reliable, efficient, and good performing. Embodiments ... | 10/09/2007 |
