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Lighting device

A technology for lighting devices and dimmers, applied in lighting devices, components of lighting devices, lighting and heating equipment, etc., can solve problems such as LED extinguishing, inability to adjust illuminance, and inability to ensure voltage

Inactive Publication Date: 2014-06-11
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, in the existing LED device, when using the existing dimmer, there is a problem that the illuminance cannot be adjusted in the range where the dimming level is small (that is, the range where the illuminance is low).
This is because if the dimming level of the dimmer is small, the power supplied to the LED lighting device is correspondingly reduced, so the voltage necessary for the normal operation of the control circuit that controls the buck-boost converter cannot be ensured.
As a result, the operation of the control circuit stops and the LED turns off

Method used

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Embodiment Construction

[0038] Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0039]

[0040] figure 1 It is a sectional view showing the structure of the lighting device according to the embodiment of the present invention.

[0041] The lighting device 1 includes: an LED module (corresponding to a "light emitting module") 3 having an LED (corresponding to a "light emitting element") as a light source, a mounting member 5 on which the LED module 3 is mounted, a case 7 having the mounting member 5 at one end, and a cover. The globe 9 of the LED module 3 , the lighting circuit 11 for turning on the LEDs, the circuit holder 13 housing the lighting circuit 11 inside and arranged in the casing 7 , and the base member 15 provided at the other end of the casing 7 .

[0042] The LED module 3 includes an insulating substrate 17 on which LEDs are mounted, and a package 19 in which the LEDs are covered on the insulating substrate 17 . Th...

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Abstract

The invention aims to provide a dimmer can be used for dimming and the illumination can be adjusted even in a range of low illumination. The invention provides a lighting device (1) which receives electric power supply from an alternating-current power supply (45) through a dimmer (47), and the lighting device (1) comprises a rectifying circuit (31), a step transformer (37), a light-emitting diode (LED) module (3), a dimming level detecting circuit (39) and a control circuit (41), wherein the step transformer (37) is connected with the output side of the rectifying circuit (31); the LED module (3) is connected with the output side of the step transformer (37); the dimming level detecting circuit (39) detects the dimming level of the dimmer (47); and the control circuit (41) controls the step transformer (37) to supply current corresponding to the dimming level detected by the dimming level detecting circuit (39) for the LED module (3), so that the working electric power of the control circuit (41) is supplied from the output side of the step transformer (37).

Description

technical field [0001] The present invention relates to a lighting device including a light-emitting element such as an LED (light-emitting diode), and more particularly to a lighting circuit for lighting the light-emitting element. Background technique [0002] In recent years, in consideration of energy saving, many light bulb-shaped LED lighting devices that replace incandescent lamps have been proposed. The lighting circuit of the LED lighting device includes a rectifier circuit (Rectifier Circuit) for rectifying AC power, a Buck-Boost Converter (Buck-Boost Converter) connected to the output side of the rectifier circuit, and a Buck-Boost Converter connected to the output side of the Buck-Boost Converter. A light-emitting module, a control circuit for controlling a buck-boost converter, etc. (see, for example, Patent Document 1). [0003] Patent Document 1: Japanese Patent Laid-Open No. 2008-235530 [0004] Traditionally, a dimmer using a triac (TRIAC) has been widely ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F21S2/00F21V23/00H05B37/02H02M7/08H02M3/04F21Y101/02
Inventor 濑户本龙海田村哲志松井伸幸钱海波苏浩谢玮
Owner PANASONIC CORP