| Class / Patent application number | Description | Number of patent applications / Date published |
|---|
| 315239000 | Transformer in the condenser load device circuit | 14 |
| 20090121643 | Backlight Unit and Liquid Crystal Display Device Including the Same - A backlight unit of a liquid crystal display includes a lamp, a balancing pattern capacitor electrically connected to the lamp for current balance, a transformer electrically connected to the lamp via the balancing pattern capacitor, a sensing pattern capacitor electrically connected to a terminal of the balancing pattern capacitor connected to the lamp to detect an abnormal driving state of the lamp, and a feedback circuit unit electrically connected to the sensing pattern capacitor to control the abnormal driving state of the lamp. A liquid crystal display device including the backlight unit is also disclosed. | 05-14-2009 |
| 20100102740 | CONTROL CIRCUIT AND FLASH SYSTEM USING SAME - A control circuit is configured to control the charge and discharge of a flash unit. The flash unit includes an anode, a cathode, and a trigger electrode. The control circuit includes a charging circuit and a triggering circuit. One terminal of the charging circuit is coupled to a charging terminal and another terminal is coupled to the anode and the cathode. One terminal of the triggering circuit is coupled to a triggering terminal, another terminal is couple to the trigger electrode. The charging circuit includes a first capacitor coupled to the cathode and a second capacitor coupled to the anode. When the charging terminal receives a charging voltage and the triggering terminal receives a high-level voltage, three times charging voltage is formed between the anode and the cathode; then the flash unit generates a flash. | 04-29-2010 |
| 20100289422 | PIEZOELECTRIC TYPE RESONANCE HIGH-VOLTAGE LIGHT-STARTING CIRCUIT - A piezoelectric type resonance high-voltage light-starting circuit, wherein, the intrinsic capacitance characteristic of a piezoelectric transformer is utilized as a piezoelectric capacitor, and said piezoelectric transformer connected to a light tube is connected in series with an independent inductor, thus forming a resonance type series-connected or parallel-connected light-starting circuit, hereby achieving the efficacy of small leakage current, low operating temperature, and high voltage endurance, as such raising the light-starting efficiency. Furthermore, in the application of said circuit mentioned above, output voltage is further amplified through a booster transformer, thus achieving its characteristics of high illuminance. When driving said plurality of light tubes, a fixed frequency is utilized in making an intrinsic impedance of an equivalent circuit containing said piezoelectric capacitor to be fixed at a constant value, thus current flowing in each of said light tubes is equivalent, and achieving balance of currents in said plurality of light tubes. | 11-18-2010 |
| 20110266966 | ELECTRONIC CIRCUIT FOR DRIVING A FLUORESCENT LAMP AND LIGHTING APPLICATION - The present invention provides an electronic circuit for driving a fluorescent lamp from a periodic input voltage provided at a power input terminal. The circuit comprises an inverter for powering the fluorescent lamp, and a control unit. The control unit comprises a measuring input connected to the power input terminal for providing a synchronisation signal representing a value of the periodic input voltage to the control unit, a control input for receiving an input signal representative of a desired lighting characteristic of the fluorescent lamp, and a control output connected to an enabling input of the inverter. The control unit is arranged to provide, via the control output, a control signal to the inverter to operate the inverter in synchronism with a periodicity of the synchronisation signal representing the value of the periodic input voltage, the control signal being based on the input signal. | 11-03-2011 |
| 20110273105 | METHOD FOR DRIVING LAMP OF BACKLIGHT CONTROL CIRCUIT - A backlight control circuit includes a secondary winding, a control circuit, a first circuit including a first capacitor and a first switching element, and a second circuit including a second switching element and a reactance element. A method for driving the backlight control circuit includes the control circuit switching off the first switching element, and the secondary winding outputting a startup AC voltage to the lamp. A first resonant circuit which includes the lamp, the secondary winding and the first circuit is formed, with a first resonant frequency suitable to light up the lamp. The control circuit switches on the first switching element, and the secondary winding outputs an operation AC voltage to the lamp. A second resonant circuit which includes the lamp, the secondary winding, the first and second circuit is formed, with a second resonant frequency suitable to keep the lamp lighted. | 11-10-2011 |
| 20110291579 | DISCHARGE LAMP STARTING CIRCUIT AND DISCHARGE LAMP LIGHTING DEVICE - The present invention is capable of continuously applying an optimum starting waveform to a discharge lamp using a simple-enough circuit configuration. A starting circuit is connected to output terminals of an inverter, and the starting circuit outputs to a discharge lamp an output voltage Vout capable of starting the discharge lamp that is a load, upon receiving an AC power with a high frequency from the inverter at the start of the discharge lamp. Further, the starting circuit is connected to output terminals of the inverter, and comprises two windings connected to the output terminals of the inverter and serially connected to the discharge lamp; a first capacitor connected between an output terminal of the first winding and an input terminal of the second winding; and a second capacitor connected between an input terminal of the first winding and an output terminal of the second winding. | 12-01-2011 |
| 20120161659 | ACTIVATION MODULE FOR A GAS DISCHARGE LAMP - A driving module for a gas discharge lamp, in particular for headlights in vehicles, comprises a suitable lamp socket, a carrier for electrical components, and an ignition transformer, wherein the component part carrier is populated at least with electrical components of an ignition unit and moreover is designed for accommodating further electrical components that are required for a self-sustaining operation of the driving module. In addition, the lamp socket is made of a high temperature resistant plastic material and has an integrated high-voltage conducting track. | 06-28-2012 |
| 20130015777 | METHOD FOR FEEDING LIGHT SOURCES AND RELATED DEVICEAANM De Anna; PaoloAACI Valla di Riese Pio X (Treviso)AACO ITAAGP De Anna; Paolo Valla di Riese Pio X (Treviso) ITAANM D'Inca; IlanAACI Feltre (Belluno)AACO ITAAGP D'Inca; Ilan Feltre (Belluno) IT - In various embodiments, a method for powering light sources from a input power supply through a converter circuit is provided including a primary side and a secondary side separated by a galvanic barrier, wherein the primary side includes a power factor control block with an output capacitor. The method may include providing save circuitry on said secondary side for saving operational data of the converter upon failure of said input power supply; and powering said save circuitry during saving said operational data with energy derived from said output capacitor of said power factor control block. | 01-17-2013 |
| 20130181633 | LIGHTING DEVICE EMPLOYING AC-DRIVEN LIGHT-EMITTING DIODES - Disclosed is a lighting device including a circuit including at least two parallel-connected light-emitting diodes of opposite pole in a first parallel branch and comprising at least two parallel-connected light-emitting diodes of opposite pole in a second parallel branch, and also including a capacitor and a coil. At least one of the diodes emits red light, blue light, and/or white light. | 07-18-2013 |
| 20130300310 | LIGHT EMITTING DIODE DRIVER WITH ISOLATED CONTROL CIRCUITS - A light emitting diode (LED) driver circuit that generates current for driving an LED load includes a voltage converter circuit configured to supply a drive current to the LED load in response to a control signal, a control circuit that generates the control signal, and a bias voltage generating circuit that generates the bias voltage for the control circuit. The bias voltage generating circuit is galvanically isolated from a power supply voltage and from the LED load. The voltage converter circuit regulates a level of the drive current supplied to the LED load in response to the control signal. | 11-14-2013 |
| 20140167639 | SYSTEMS AND METHODS FOR LOW-POWER LAMP COMPATIBILITY WITH A LEADING-EDGE DIMMER AND AN ELECTRONIC TRANSFORMER - Methods and systems to provide compatibility between a load and a secondary winding of an electronic transformer driven by a leading-edge dimmer may include: (a) responsive to determining that energy is available from the electronic transformer, drawing a requested amount of power from the electronic transformer thus transferring energy from the electronic transformer to an energy storage device in accordance with the requested amount of power; and (b) transferring energy from the energy storage device to the load at a rate such that a voltage of the energy storage device is regulated within a predetermined voltage range. | 06-19-2014 |
| 20140167640 | Back-up Capacitor - This invention relates to driver circuits used within high voltage power supplies, e.g. for light bulb assemblies. A driver circuit providing electrical energy at an output derived from electrical energy at an input is described. The driver circuit comprises a power converter, a controller, a supply voltage capacitor, and is configured to provide a supply voltage to the controller. A start-up resistor is coupled to the input of the driver circuit, charges the supply voltage capacitor, and is coupled to the supply voltage capacitor during start-up of the driver circuit. A back-up capacitor is coupled to the output of the driver circuit and with the supply voltage capacitor if a voltage at the back-up capacitor exceeds the supply voltage by a forward voltage threshold, and is decoupled from the supply voltage capacitor if the supply voltage exceeds the voltage at the back-up capacitor by a reverse voltage threshold. | 06-19-2014 |
| 20140346967 | SECONDARY-SIDE SENSING OF PHASE-DIMMING SIGNAL - Current is regulated in an LED lamp by sensing, in a manner electrically isolated from a primary side of a transformer, an LED current in an LED; creating a digital control signal based on the LED current; transmitting the digital control signal from the secondary side of the LED circuit to the primary side; and controlling power delivered to the primary side based at least in part on the transmitted digital control signal. | 11-27-2014 |
| 20140368124 | DRIVER WITH ISOLATION AND SURGE SIGNAL PROTECTION | 12-18-2014 |
