Nisimoto
Kazuhiro Nisimoto, Osaka JP
Patent application number | Description | Published |
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20120223651 | ILLUMINATION SYSTEM - An illumination system includes a lighting apparatus having a solid-state light emitting element as a light source; and a dimmer including a bidirectional switching element having a self-sustaining function and connected to a serial circuit of the lighting apparatus and an external power source. The dimmer varies a conduction angle of the bidirectional switching element by controlling a phase of an AC voltage of the external power source, wherein the lighting apparatus performs dimming of the light source based on the conduction angle of the bidirectional switching element, and the dimmer continues to apply driving current to the bidirectional switching element during a first period, which is a part of a second period, the bidirectional switching element being allowed to conduct throughout the second period. | 09-06-2012 |
Kazuhiro Nisimoto, Hyogo JP
Patent application number | Description | Published |
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20120262087 | LIGHTING DEVICE FOR SOLID-STATE LIGHT SOURCE AND ILLUMINATION APPARATUS INCLUDING SAME - A lighting device for a solid-state light source includes a DC power source circuit section which flows a current in a solid-state light source by using a charging/discharging current or either one of charging and discharging currents of a inductor connected in series to a switching element, and a current control section having a first switching control unit for changing an ON width of the switching element depending on a dimming level and a second switching control unit for controlling an ON timing of the switching element. The second switching control unit changes a time until the switching element is turned on from a zero-crossing of the discharging current of the inductor such that the time becomes substantially the same when the dimming level is equal to or greater than a predetermined level, and the time becomes longer when the dimming level is less than the predetermined level. | 10-18-2012 |
20120268028 | POWER SUPPLY - A power supply includes: a step-down chopper unit for stepping down a DC voltage from a DC power source to a voltage required for lighting; and a dimming control unit which dims the light source by alternately repeating a switching ON period during which a drive signal having a frequency higher than that of the dimming signal is supplied to the switching element and a switching OFF period during which the supply of the drive signal to the switching element is stopped. Further, the power supply includes an inrush current prevention unit for preventing an inrush current occurring when the DC power source is turned on, and a compensation unit which applies a drive voltage to the thyristor in the switching OFF period. | 10-25-2012 |
Susumu Nisimoto, Nara JP
Patent application number | Description | Published |
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20090058371 | AUXILIARY ELECTRIC POWER SUPPLY FOR VEHICLE AND CHARGER/DISCHARGER FOR VEHICLE - The auxiliary electric power supply for a vehicle has a first switch electrically connected to an I/O end; a capacitor bank; a discharge resistance; and a controller. The capacitor bank has series-connected electric double layer capacitors, and balanced resistances. Each of the balanced resistance is parallel-connected to each electric double layer capacitor, and has substantively the same resistance value. The capacitor bank and discharge resistance are connected to the first switch. The controller controls the first switch while monitoring the voltage of the capacitor bank and the operating state of the ignition key operating the ignition switch of the vehicle, so as to connect the capacitor bank to the discharge resistance when the ignition switch is turned off. | 03-05-2009 |