Patent application number | Description | Published |
20080303449 | COLD CATHODE FLUORESCENT LIGHTING DISCHARGE TUBE DEVICE - A cold cathode fluorescent lighting discharge tube device is provided which comprises a first ballast element | 12-11-2008 |
20090122581 | ALTERNATING CURRENT POWER SUPPLY DEVICE AND INTEGRATED CIRCUIT FOR ALTERNATING CURRENT POWER SUPPLY DEVICE - An alternating current power supply device is provided with switch elements Q | 05-14-2009 |
20100060191 | ELECTRIC-DISCHARGE-LAMP LIGHTING APPARATUS - An electric-discharge-lamp lighting apparatus including: an inverter that converts a DC voltage to a high-frequency voltage; an insulating transformer for low voltage with a primary winding connected to an output end of the inverter; and a plurality of step-up transformers. In the electric-discharge-lamp lighting apparatus, a first series circuit formed by connecting primary windings of the plurality of step-up transformers in series to one another is connected to a secondary winding of the insulating transformer. In addition, one or more electric discharge lamps are connected respectively to secondary windings of the step-up transformers. | 03-11-2010 |
20100164385 | DISCHARGE LAMP LIGHTING DEVICE - A discharge lamp lighting device is provided to comprise tube current detecting circuits | 07-01-2010 |
20100164392 | DISCHARGE LAMP LIGHTING APPARATUS - A discharge lamp lighting apparatus is inexpensive and is capable of generally relaxing an unevenness of brightness caused by a brightness gradient of a discharge lamp. The apparatus includes an inverter | 07-01-2010 |
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 |
20130253865 | Alternating Current Input Voltage Detection Circuit - An alternating current input voltage detection circuit comprises: a first voltage waveform detection circuit that detects a voltage waveform of one alternating current input terminal of the diode rectification circuit, based on a reference potential of the device; a second voltage waveform detection circuit that detects a voltage waveform of the other alternating current input terminal of the diode rectification circuit, based on the reference potential of the device, and a voltage waveform generation circuit that: calculates a first detection voltage waveform, which is output from the first voltage waveform detection circuit, and a second detection voltage waveform, which is output from the second voltage waveform detection circuit; generates a voltage waveform signal, in which waveform distortions generated in the first detection voltage waveform and the second detection voltage waveform are eliminated; and outputs the voltage waveform signal as the voltage detection signal. | 09-26-2013 |
Patent application number | Description | Published |
20090039795 | DISCHARGE LAMP LIGHTING APPARATUS - A discharge lamp lighting apparatus includes a plurality of discharge lamps | 02-12-2009 |
20090267535 | AC POWER SOURCE APPARATUS - An AC power source apparatus includes an inverter | 10-29-2009 |
20100073976 | DC/AC CONVERTER - A DC/AC converter includes: a resonant circuit including a transformer having a primary winding and a secondary winding and at least one capacitor, in which the capacitor is connected to at least one of the primary winding and secondary winding of the transformer, and an output terminal to which the load is to be connected is provided on the secondary winding side; a switching circuit connected to both ends of a direct current power supply and having a bridge configuration composed of switching elements for flowing a current through the primary winding of the transformer and the capacitor in the resonant circuit; and a control circuit that turns on/off the switching elements by a pair of drive signals, and flows a current through the load bidirectionally, thereby performs a PWM control for the current flowing through the load, wherein the control circuit includes step drive circuits which turn on the switching elements in steps, and the step drive circuits are provided so as to individually correspond to the switching elements. | 03-25-2010 |
20100171433 | LUMINESCENT LAMP LIGHTING DEVICE - A luminescent lamp lighting device includes a plurality of switch circuits | 07-08-2010 |
20100182810 | ALTERNATING-CURRENT POWER SUPPLY DEVICE - An alternating-current power supply device includes: a direct-current power supply Vin; a transformer T | 07-22-2010 |
20140119084 | AC Input Voltage Detection Circuit and AC/DC Power Source - An AC input voltage detection circuit of detecting abnormality of an AC input voltage inputted to an AC/DC converter, includes: a first comparator circuit configured to compare the AC input voltage with a first reference voltage; a second comparator circuit configured to compare the AC detection voltage with a second reference voltage higher than the first reference voltage; and a timer circuit configured to start counting of a timer if the first comparator circuit detects that the AC input voltage is equal to or lower than the first reference voltage and to clear the counting of the timer if the second comparator detects that the AC input voltage is larger than the second reference voltage, wherein the timer circuit outputs an AC abnormality detection signal when a preset abnormality detection time is passed without clearing the counting since the counting of the timer has been started. | 05-01-2014 |