Matsushita Electric Works, Ltd.

Panasonic Electric Works Co., Ltd.

Yutaka Iwahori

Toshiaki Nakamura

Tsutomu Shiomi

Takeshi Kamoi

Hiroichi Shinbori

Shinji Hizuma

Ryoji Yokotani

Masaru Sugimoto

Satoshi Mori

Hideyoshi Kimura

Shinya Ishizaki

Kenichiro Tanaka

Minoru Maehara

Minoru Yamamoto

Naoki Komatsu

Yoshiyuki Uchinono

Eiji Shiohama

Tokushi Yamauchi

Toshiyuki Suzuki

Hiroyasu Eriguchi

Takuma Hashimoto

Yuji Suzuki

Koji Nishioka

Hiroshi Nishimura

Masahide Muto

Takuma Hashmoto

Hiroyuki Sekii

Kouji Nishioka

An LED luminaire is provided with a light emitting module composed of plural kinds of LEDs emitting lights of different colors, a lens unit having a lens for diffusing the mixed-color light from the light emitting module, a light output controller for controlling electric current fed to each of the LEDs, and a light sensor for sensing the light from the light emitting module. The light output controller performs feedback control on the electric current fed to each of the LEDs based upon light levels of the sensed light, so that the light emitted from the light emitting module has desired chromaticity. The lens unit contains a light guide for guiding the light from the lens to the light sensor and can guide the light from the light emitting module to the light sensor with a high efficiency.

LED luminaire

A light emitting device comprises: an LED chip mounted in a recess formed in a mounting substrate; a wavelength converting member that is disposed so as to cover the recess and the edge area around the recess and that is excited by light emitted from the LED chip to emit light of a wavelength different from an excitation wavelength; and an emission control member disposed at a light output side of the wavelength converting member so as to allow emission of light coming from an area of the wavelength converting member that corresponds to the recess and to prevent emission of light coming from an area of the wavelength converting member that corresponds to the edge area around the recess. This can prevent variations in color between light emitted from the central part of the wavelength converting member and light emitted from the part of the wavelength converting member that is located on the edge area around the recess of the mounting substrate, thereby reducing unevenness of color on the irradiation surface.

Light emitting device using light emitting diode chip

A light-emitting device () has a submount () and a plate for heat transfer () having a metallic plate (). The submount () has a mount base (), at least one light-emitting diode chip () mounted thereon and electrically conducting lines (-) formed on the mount base () to be connected electrically to the light-emitting diode chip (). A first plane () of the mount base () of the submount () is bonded thermally to the first plate (). For example, the plate is a circuit board having a metallic plate (), and the submount () is bonded thermally to the metallic plate () of the one of the at least one plate (). In an example, a second plate for heat transfer is also bonded thermally to a second plane of the mount base () for providing a plurality of heat transfer paths.

Light-emitting device

An electronic ballast for a high intensity discharge lamp (HID) includes a power converters, a controller, and a lamp power switch. In the power converter, an input DC voltage is converted into a ballast output power for lighting the HID lamp. The controller has a function to control the power converter and change the ballast output power. The lamp power switch detects a lamp output parameter indicated after the HID lamp starts discharge, identifies a lamp power of the HID lamp according to the lamp output parameter, and gives an identification signal indicating the lamp power. In response to this identification signal, the power converter outputs the ballast output power which matches with the lamp power identified.

Electronic ballast for a high-pressure discharge lamp

This power converter comprises a plurality of switching elements, an inductor, and a smoothing capacitor. An input current of low frequency from the AC source is intermitted by the switching element turned on and off at high frequency, and an output current to a load is restricted by the inductor. These switching elements are controlled in different patterns. While these patterns are repeated, a current is always supplied to the load and inductor. Therefore, the power converter can provide a desired output power, making the inductance required for the inductor into the minimum. That is, the power converter can combine miniaturization and high-efficiency.

Power converter

A discharge lamp lighting device includes first power converting circuit converting an input source voltage into another DC voltage, second power converting circuit constituted by a buck converter, and a discharge lamp as a load driven by an output of the second power converting circuit. The device being so controlled that a switching element in the second power converting circuit will be turned ON when the voltage across the switching element is the minimality. Wherein a unit is provided for regulating an output voltage of the first power converting circuit in a direction of reducing the voltage across the element immediately before turning ON of the second power converting circuit, and a highly efficient operation can be always realized irrespective of conditions of the load.

Discharge lamp lighting device

Power source device including a plurality of switching circuit for power

A power device includes at least two power conversion circuits respectively having at least one of switching elements, at least one of which switching elements in these conversion circuits being used in common as an element constituting the at least two different power conversion circuits, a control device providing at least a period in which at least one of currents flowing from at least one of the different power conversion circuits to the commonly used switching element has a polarity inverse to at least the other one of the currents flowing from at least the other one of the power conversion circuits, so as to cancel each other, and a unit for detecting the state of the respective conversion circuits. The operation of the switching elements is thereby made modifiable in accordance with a lowering in the resistance of a load of the device, and the withstand voltage of the elements can be prevented effectively from rising even upon any fluctuation in the load.

Power device with commonly used switching elements

A power source device is so arranged that one of switching elements forming a plurality of power conversion switching circuits which is used in common during each switching cycle is made to have a switching period in which mainly a current is taken up from a power source of first one of the switching circuits, the switching period being varied in a zone in which an input voltage is higher than a predetermined voltage in a cycle of input voltage waveform. Any distortion of input current waveform occurring around lower voltage period of commercial AC source is thereby reduced, in the power source device wherein the power conversion switching circuits employ commonly the switching elements.

Power source device

A lighting device for a high-pressure discharge lamp includes an inverter circuit for converting a DC voltage into an AC voltage using a pair of switching elements. The switching elements have a switching frequency for starting the high-pressure discharge lamp that is higher than a resonance frequency of a series resonance circuit connected in parallel with the discharge lamp. However, in a lighted state of the discharge lamp, the switching frequency is lower than the resonance frequency of the resonance circuit and is within a frequency range where acoustic resonance does not occur. The lighted state of the high-pressure discharge lamp is maintained by a voltage across a capacitor in the series resonance circuit.

Stable high frequency high-pressure discharge lamp lighting device

Growing community of inventors

Kadoma, Japan

Yutaka Iwahori