Unlock instant, AI-driven research and patent intelligence for your innovation.

Led lighting device

A lighting device, LED circuit technology, applied in lighting devices, lamp circuit layout, electrical components and other directions, can solve the problems of large circuit scale, large reactor current fluctuations, and rising costs, to achieve miniaturization, realization of The effect of cost reduction

Inactive Publication Date: 2014-12-03
MITSUBISHI ELECTRIC CORP
View PDF4 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As a result, there is a problem that the withstand voltage of the switching elements constituting the converter is increased, and the fluctuation of the reactor current (=LED current) is also increased, resulting in an increase in circuit scale and cost.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Led lighting device
  • Led lighting device
  • Led lighting device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0028] Hereinafter, the LED lighting device according to Embodiment 1 of the present invention will be described with reference to the drawings. figure 1 It is a circuit configuration diagram showing the LED lighting device according to Embodiment 1 of the present invention, figure 2 It is a figure which shows the waveform of each part of the LED lighting apparatus concerning Embodiment 1 of this invention.

[0029] exist figure 1 Here, the constant voltage source 1 outputs a DC voltage as a first bus voltage V1 via a first bus 100 and outputs a DC voltage as a second bus voltage V2 via a second bus 200 to supply the voltage required for lighting the LED elements. However, there is a relationship of first bus voltage V1>second bus voltage V2>0. As a circuit constituting the constant voltage source 1 , for example, a plurality of switching regulators such as DC / DC converters and AC / DC converters can be used.

[0030] The LED circuit block 3a1 includes a switching element Qa...

Embodiment approach 2

[0052] Next, an LED lighting device according to Embodiment 2 of the present invention will be described with reference to the drawings. Image 6 It is a diagram showing a circuit configuration of an LED lighting device according to Embodiment 2 of the present invention. Figure 7 It is a figure which shows the waveform of each part of the LED lighting apparatus concerning Embodiment 2 of this invention.

[0053] exist Image 6 In the circuit structure of the LED lighting device, with respect to the embodiment 1 ( figure 1 ) components with common functions are described using the same symbols or only changing the subscripts. Embodiment 2 differs from the circuit configuration of Embodiment 1 in the connection order of elements constituting the LED circuit blocks ( 3c1 to 3cn ) and the polarities of diodes ( Dc1 to Dcn ). Each LED circuit block ( 3c1 to 3cn ) has the same structure, so the connection of the constituent elements will be described using the LED circuit block ...

Embodiment approach 3

[0070] Next, an LED lighting device according to Embodiment 3 of the present invention will be described with reference to the drawings. Figure 8 It is a circuit configuration diagram of an LED lighting device according to Embodiment 3 of the present invention. exist Figure 8 In, about having the same as Embodiment 1 ( figure 1 ) components with common functions are described using the same symbols or only changing the subscripts.

[0071] The LED lighting device of Embodiment 3 assumes a vehicle-mounted application, and includes the constant voltage source 7 , the LED circuit blocks ( 3a1 to 3an ) and the control circuit 11 described in Embodiment 1. Their basic structures are the same as those of the LED lighting device in Embodiment 1, and specifically, the unit of constant voltage source 1 in Embodiment 1 is shown as constant voltage source 7 . In addition, the control circuit 11 is a unit in which the control function of the converter constituting the constant voltag...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

This LED lighting device is provided with a control circuit (2) which controls the ON / OFF state of a switching element (Qa1) such that the LED current in an LED unit (LEDa1) is within a rated current range. When the LED unit (LEDa1) is illuminated, the voltage applied to both ends of the series connection between a reactor (La1) and the LED unit (LEDa1) is set to a first bus voltage (V1) when the switch element (Qa1) is ON, and, when a switch element (Qa2) is OFF, is set to a voltage below the first bus voltage (V1), determined on the basis of the first bus voltage (1) and a second bus voltage (V2).

Description

technical field [0001] The present invention relates to an LED lighting device for lighting a semiconductor light source composed of a light emitting diode (LED) element. Background technique [0002] LED (Light Emitting Diode, Light Emitting Diode) elements, which are semiconductor light sources, are widely used as lamps for vehicles, signals, and lamps for lighting. In addition, for such applications, the amount of light emitted by a single LED element is small, so generally a plurality of LED elements are simultaneously lit to obtain the required amount of light emitted. [0003] In a conventional LED lighting device, a converter is connected in series to an LED component composed of one or more LED elements connected in series, and a single DC power supply. The converter is composed of a switching element, a diode, and a reactor. By turning the switching element ON (conduction) and OFF (disconnection), the current flowing through the LED component is controlled by a co...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): H05B37/02H01L33/00H05B44/00
CPCH05B33/0815H05B33/0827H05B45/46H05B47/10H05B45/375H05B45/3725H05B45/345H05B45/38H05B45/48
Inventor 桑野宽久永井孝佳坂下友一
Owner MITSUBISHI ELECTRIC CORP