Patent application number | Description | Published |
20090039800 | AC POWER SUPPLY SYSTEM FOR BALANCED ENERGIZATION OF A PLURALITY OF LOADS - A gas-discharge lamp igniter is disclosed which has a group of gas-discharge lamps, such as those for LCD backlighting, connected in parallel with one another between the pair of outputs of an AC power supply. Provided one for each lamp to be energized, current-balancing transformers have their secondary windings serially interconnected. The lamps are connected to one of the pair of outputs of the AC power supply via the respective primary windings of the current-balancing transformers and the serial connection of the secondary windings thereof. | 02-12-2009 |
20090184653 | SYNCHRONOUS OPERATING SYSTEM FOR DISCHARGE TUBE LIGHTING APPARATUSES, DISCHARGE TUBE LIGHTING APPARATUS, AND SEMICONDUCTOR INTEGRATED CIRCUIT - A synchronous operating system for operating a plurality of discharge tube lighting apparatuses at the same frequency and same phase includes (1) a resonant circuit including a capacitor C | 07-23-2009 |
20090243505 | FREQUENCY SYNCHRONIZING METHOD FOR DISCHARGE TUBE LIGHTING APPARATUS, DISCHARGE TUBE LIGHTING APPARATUS, AND SEMICONDUCTOR INTEGRATED CIRCUIT - (1) An oscillator generates a triangular wave signal whose inclination for charging a capacitor and inclination for discharging the same are the same and which is used to turn on/off FETs Qp | 10-01-2009 |
20090251055 | DISCHARGE LAMP LIGHTING APPARATUS - A discharge lamp lighting apparatus includes a first inverter, a second inverter to output a voltage whose phase is opposite to that of a voltage provided by the first inverter, a discharge lamp connected between a first output terminal of the first inverter and a first output terminal of the second inverter, a first current detection circuit arranged between a second output terminal of the first inverter and a common potential and having a first current detection element and a second current detection element that are connected in series, a second current detection circuit arranged between a second output terminal of the second inverter and the common potential and having a third current detection element and a fourth current detection element that are connected in series, and a protection circuit to detect a current abnormality according to a composite signal of outputs of the second and fourth current detection elements and stop the operation of the first and second inverters. | 10-08-2009 |
20100237792 | DISCHARGE TUBE POWER SUPPLY APPARATUS AND SEMICONDUCTOR INTEGRATED CIRCUIT - An AC conversion circuit includes a main transformer having a primary winding and a secondary winding to electrically insulate the AC power source side and the discharge tube side from each other, an IC | 09-23-2010 |
20110012527 | SYNCHRONOUS OPERATION SYSTEM FOR DISCHARGE LAMP LIGHTING APPARATUSES, DISCHARGE LAMP LIGHTING APPARATUS, AND SEMICONDUCTOR INTEGRATED CIRCUIT THEREOF - Each of discharge lamp lighting apparatus that are connected to a common line includes a sawtooth-wave oscillator to generate a sawtooth signal for PWM-controlling a plurality of switching elements passing a current through a primary winding of a transformer and a capacitor of a resonant circuit connected to a discharge lamp, a PWM comparator controlling the plurality of switching elements according to the sawtooth signal, and a pulse synchronization circuit providing the common line with a synchronization pulse signal based on a pulse signal in relation to the sawtooth signal, and when receiving a synchronization pulse signal from the common line, synchronize the oscillation frequency of the sawtooth signal with the frequency of the synchronization pulse signal from the common line. So that a voltage of aligned frequency and phase is applied to one end of each discharge lamp. | 01-20-2011 |
20110018455 | DISCHARGE LAMP LIGHTING APPARATUS - A discharge lamp lighting apparatus includes a resonant circuit ( | 01-27-2011 |
20110103109 | AC POWER SOURCE APPARATUS - An AC power source apparatus includes a first AC voltage generator having a first switch set, to output a first AC voltage having a positive-negative asymmetrical waveform by turning on/off the first switch set to a first end of a load; a second AC voltage generator having a second switch set, to output a second AC voltage having a positive-negative asymmetrical waveform and a phase difference of 180 degrees with respect to the first AC voltage by turning on/off the second switch set to a second end of the load; and a control circuit to turn on/off the first switch set, and by setting a phase difference of 180 degrees with respect to the turning on/off of the first switch set, turn on/off the second switch set. A voltage across the load is an AC voltage having a positive-negative symmetrical waveform. | 05-05-2011 |