Toshiba Lighting & Technology Corporation

Kabushiki Kaisha Toshiba

Panasonic Corporation

Panasonic Electric Works Co., Ltd.

Naoko Iwai

Hiroshi Kubota

Masahiko Kamata

Hitoshi Kawano

Hiroshi Terasaka

Masatoshi Kumagai

Toru Ishikita

Hajime Osaki

Toshihiko Sasai

Yosuke Saito

Takuro Hiramatsu

Toshiyuki Hiraoka

Isao Yamazaki

Shinya Hakuta

Hirokazu Otake

Takeshi Saito

Noriyuki Kitamura

Hiroki Nakagawa

Katsunobu Hamamoto

Hiroyuki Sako

Shinji Nogi

Kenichi Asami

Hiromichi Nakajima

Katsusuke Uchino

Go Kato

Kiyoteru Kosa

Kazuyuki Uratani

Mitsuhiro Matsuda

Tomokazu Usami

Sayaka Tomiyama

Makoto Kono

Hiroya Kan

Takao Kowada

Koji Takahasi

A dedicated power source for LED lamps capable of reliably detecting attachment of an LED lamp is provided. A dedicated power source has a DC power source portion, and includes a lighting circuit which receives power supplied from the DC power source portion and light-controls an LED lamp including an LED element and a detection resistor connected in parallel to the LED element and an attachment detecting portion for detecting attachment of the LED lamp based on a voltage level changing in accordance with attachment/detachment of the detection resistor by attachment/detachment of the LED lamp.

Power source unit for LED lamps, and LED lamp system

A lighting circuit according to embodiments includes: a self-hold element connected in series to an AC power source that generates power for lighting an illumination load, together with the illumination load, the self-hold element being configured to control supply of the power provided by the AC power source to the illumination load by the self-hold element being turned on/off; a noise prevention circuit connected in parallel to the self-hold element; and a damping circuit configured to connect a damping resistance to the noise prevention circuit parallely only for a predetermined period from turning-on of the self-hold element, thereby preventing the self-hold element from being repeatedly turned on/off during a period in which the self-hold element is on under normal conditions, due to a transient during power supply.

Lighting circuit and illumination device

An illuminating device includes a plurality of kinds of LEDs that emit light having different color temperatures; a plurality of LED lighting circuits that independently light the LEDs for each color temperature of emitted light; and a control unit that selects a first control changing illuminance of the LEDs as a whole by controlling the lighting of the LEDs and a second control changing the colors of light of the LEDs as a whole by controlling the lighting of the LEDs, and corrects an illuminance difference generated before and after the second control.

Illuminating device and illuminating method

A DC power source unitis provided which boosts source voltage from a power source portion. A lighting circuitis provided which supplies DC voltage to loads, the DC voltage being obtained by stepping down output current of the DC power source circuit. A control circuitis provided which controls the lighting circuitin accordance with at least either voltage or current of LEDsand controls the DC power source unitso that a ratio of output voltage to voltage of the LEDsbecomes a preset fixed ratio.

DC power source unit and LED lamp system

According to one embodiment, a luminaire includes a lighting circuit configured to light a light source with a power supply from the outside, an accumulated-lighting-time storing section configured to store accumulated lighting time of the light source, and a control circuit configured to control the lighting circuit in a set mode. The control circuit sets, if a pattern for turning on and off the power supply from the outside is a predetermined initial illuminance correction setting pattern, a mode in an initial illuminance correction mode for performing initial illuminance correction corresponding to the accumulated lighting time of the light source. The control circuit sets, if the pattern for turning on and off the power supply from the outside is a predetermined normal setting pattern, the mode in a normal mode for not performing the initial illuminance correction.

Power supply device, luminaire and power source system

A lighting system according to embodiments includes a first light source, a second light source, a first lighting circuit, a second lighting circuit, a signal input unit, and a control circuit. The first light source has a predetermined color temperature. The second light source has a color temperature which is different from that of the first light source. The first lighting circuit lights the first light source. The second lighting circuit lights the second light source. The signal input unit receives an external signal. The control circuit includes a first light source lighting control cycle which performs a predetermined lighting control of the first light source, and a second light source lighting control cycle which performs a predetermined lighting control of the second light source, controls the first and second lighting circuits so as to start the lighting control.

Lighting system and control method thereof

According to one embodiment, a lighting device includes a control circuit that includes a threshold for a case where a pair of the illumination lamps are connected in series between a positive output end and a negative output end of a power supply circuit, and a threshold for a case where one illumination lamp is connected between the positive output end and the negative output end of the power supply circuit. The control circuit determines the connected lamp number of the illumination lamps to a direct-current power supply device based on a voltage between the positive output end and the negative output end of the power supply circuit and a voltage between a non-potential connection end and the positive output end or the negative output end, and selects the threshold corresponding to the connected lamp number to control the direct-current power supply device.

Lighting device and luminaire

In one embodiment, a DC power supply unit includes a DC power supply source; a load circuit connected to an output end of the DC power supply source; a load state detection device to detect a load voltage or an electric quantity corresponding to the load voltage; and a control device to receive the detected output of the load state detection device. The control device controls a maximum output voltage of the DC power supply source so that the voltage difference between the maximum output voltage of the DC power supply source and the load voltage at the time of normal operation falls within a predetermined range in which arc discharge is suppressed.

DC power supply unit and LED lighting apparatus

According to one embodiment, an LED lighting device includes a DC source, a non-insulated step-down chopper and a light emitting diode. The non-insulated step-down chopper includes: a first circuit in which a switching element, a current detecting impedance element and an inductor are connected in series to each other; a second circuit in which the inductor and a freewheel diode are connected in series to each other; and a control portion for controlling the switching element. A power portion including the switching element and the control portion are constituted by a single package IC, and the current detecting impedance element and inductor are attached to the outside of the IC.

Led lighting device and illumination apparatus

There is provided an LED lighting device having a satisfactory temperature characteristic and a small amount of variation in output current. The step-down chopper is provided with a first circuit including the switching element, the impedance means and a first inductor connected in series and a second circuit including the first inductor and a diode connected in series. A self-excited drive signal generation circuit is provided with a second inductor magnetically coupled with the first inductor and applies a voltage induced in the second inductor to the switching element to keep the switching element on. A turn-off circuit outputs an output voltage when the voltage of the impedance means detected by a comparator exceeds the reference value, and the output voltage allows a switching element to turn on to short-circuit the output terminals of the self-excited drive signal generation circuit, resulting in that the switching element is turned off.

Light-emitting diode lighting device with step-down chopper

A fluorescent lamp lighting apparatus according to the present invention comprises an initial illuminance correction control circuit which sets a fluorescent lamp to an initial illuminance correction control lighting mode, a switching portion which changes the fluorescent lamp from the initial illuminance correction control lighting mode to an external control dimming mode when a predetermined external dimming signal is detected, and a control portion which gradually dimming so as to achieve a dimming level of a switched mode when switching the initial illuminance correction control lighting mode and the external control dimming mode, and control so as to achieve a dimming level corresponding to a cumulative lighting time of the fluorescent lamp when the changed mode is the initial illuminance correction control lighting mode.

Fluorescent lamp lighting apparatus and lighting control system

Growing community of inventors

Yokosuka, Japan

Naoko Iwai