KR20120114711A - Led lighting apparatus - Google Patents

Abstract

PURPOSE: An LED lighting device is provided to have a high energy saving effect by providing fast processing speed and low power consumption. CONSTITUTION: A rectifier receives AC power from the outside. The rectifier converts the AC power to DC power for driving LED elements. An LED driving unit(140) drives the LED elements by receiving the DC power. A plurality of LED groups(L1-Ln) includes the LED elements. A conduction line connects the LED elements and the rectifier.

Description

LED lighting device {LED LIGHTING APPARATUS}

The present invention relates to an LED lighting apparatus, and more particularly, to an LED lighting apparatus capable of emitting light having each of the LEDs having a uniform light intensity.

In general, lighting lamps are used to convert electrical energy into light energy to provide light or to irradiate objects so that objects can be identified at night or indoors. Recently, lighting is used for interior decoration and various color production. Generally, incandescent lamps, fluorescent lamps, halogen lamps, metal halide lamps, mercury lamps and sodium lamps are used.

Fluorescent lamps are most commonly used as light sources in offices and homes, and have less glare and higher luminous efficiency than incandescent bulbs. Fluorescent lamps also have the advantage that they involve little heat compared to incandescent bulbs.

Such a fluorescent lamp is composed of components such as a fluorescent lamp and a ballast separately. In the fluorescent lamp, a fluorescent material is coated on an inner wall of a vacuum glass tube (mercury discharge tube), and an argon gas and a small amount of mercury are sealed therein, and a voltage is applied to generate light by discharge of the gas.

As described above, the fluorescent lamp is difficult to manufacture because the vacuum glass tube (mercury discharge tube) should be sufficiently sealed, there is a problem that the fluorescent lamp flickers when used for a long time to make the user feel tired eyes. In addition, due to self-heating, it causes a lot of power loss by raising the ambient temperature, it does not turn on at low voltage below the reference value, it takes time to turn on and emit light, and there is a disadvantage that the fluorescent lamp is broken when overheated. .

Recently, a lamp using a light emitting diode (LED) has been developed as a replacement for a fluorescent lamp. Lamps using LEDs are excellent in converting power into light and have high light efficiency compared to unit power. In addition, it has a semi-permanent lifespan and direct conversion of electrical energy to light energy, resulting in high efficiency and low power consumption.

In addition, LED lamps have the advantages of fast processing speed and low power consumption, and do not use heavy metals such as mercury, which are environmentally friendly and have high energy efficiency. The use of such a lamp using the LED has been in the spotlight as the lighting, such as 60-80% power saving effect compared to general lighting, has a semi-permanent life of more than 50,000 hours, and does not cause glare.

The problem to be solved of the present invention is to provide an LED lighting device capable of emitting light each of the LEDs having a uniform light intensity.

In accordance with an embodiment of the present invention, an LED lighting apparatus includes a rectifying unit configured to receive an AC power input from the outside and convert it into a DC power source for driving LED elements, and receive the DC power output from the rectifying unit. And an LED driver for driving the plurality of LEDs, wherein the LED driver includes: a conductive line for connecting the plurality of LED groups including the LED elements, the LED elements included in the plurality of LED groups, and the rectifier; line), and the resistance values of the conductive lines connected to each of the plurality of LED groups are the same.

Preferably, each of the plurality of LED groups is connected in parallel with the other LED groups, characterized in that the conductive line and each of the plurality of LED groups are connected in series.

Preferably, each of the plurality of LED groups includes the same LED elements, and a length of a conductive line connected to each of the plurality of LED groups is the same as each of the plurality of LED groups.

According to the present invention, it is possible to provide an LED lighting device capable of emitting light each of the LEDs having a uniform light intensity.

1 shows an LED lighting apparatus according to an embodiment of the present invention.
FIG. 2 is a circuit diagram according to an embodiment of a driving circuit board on which a plurality of LED elements are mounted in the LED lighting apparatus shown in FIG. 1.
3 is a circuit diagram according to another embodiment of a driving circuit board on which a plurality of LED elements are mounted in the LED lighting apparatus shown in FIG. 1.

The present invention is capable of various modifications and various forms, and specific embodiments are illustrated in the drawings and described in detail in the text. It should be understood, however, that the invention is not intended to be limited to the particular forms disclosed, but includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention.

The terms first, second, etc. may be used to describe various elements, but the elements should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, the first component may be referred to as a second component, and similarly, the second component may also be referred to as a first component.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. Singular expressions include plural expressions unless the context clearly indicates otherwise. In this application, the terms "comprise" or "having" are intended to indicate that there is a feature, number, step, action, component, part, or combination thereof described in the specification, and that one or more other features It should be understood that it does not exclude in advance the possibility of the presence or addition of numbers, steps, actions, components, parts or combinations thereof.

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art.

Terms such as those defined in commonly used dictionaries are to be interpreted as having a meaning consistent with the meaning in the context of the relevant art and are to be interpreted as ideal or overly formal in meaning unless explicitly defined in the present application Do not.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Reference will now be made in detail to the preferred embodiments of the present invention, examples of which are illustrated in the accompanying drawings.

1 shows an LED lighting apparatus according to an embodiment of the present invention.

Referring to FIG. 1, the LED lighting apparatus 100 according to the present invention includes a cap 110, a housing 120, a driving circuit board 130, an LED driving unit 140 and a cover 150 including a plurality of LED elements. ).

Cap 110 is formed in a substantially cylindrical with one side open, the other side is formed with a terminal 111 to be connected to a ballast power supply or commercial AC power supply of fluorescent lights. Cap 110 may be installed on both sides symmetrical so that the LED lighting device 100 according to the present embodiment can be combined like a conventional fluorescent lamp.

The housing 120 is formed in a substantially semi-cylindrical shape with an open top, and is coupled between the two caps 110. The housing 120 may include an outer step, an inner step, and a plurality of heat dissipation fins. The outer step is formed in the outward direction of the housing 120 and is coupled with the cover 150. The inner step 122 is formed at a position corresponding to the outer step in the inward direction of the housing 120. The driving circuit board 130 may be coupled to the inner step by sliding. The plurality of heat dissipation fins may be formed by extending a predetermined length toward the inner side as the inner lower portion of the inner step. The housing 120 may be formed of a metal such as aluminum to improve heat dissipation performance.

According to an embodiment, the housing may be formed of various materials other than aluminum.

The driving circuit board 130 is coupled to the internal step of the housing 120 and converts AC power into DC power.

In the LED driver 140 including a plurality of LED elements, the LED elements are coupled to the driving circuit board 130 in a single row, a multi-row, or a matrix. The LED elements emit light by receiving the converted DC power through the power supply unit of the driving circuit board 130.

The cover 150 is coupled to the cap 110 and the housing 120 to amplify and diffuse light from the LED driver 140 and output the light. The cover 150 is formed with a plurality of embossing to amplify and diffuse the light on the inner surface, it may be formed of a transparent or translucent plastic through which the light can pass. In the present embodiment, the material of the cover 150 is described as transparent or translucent plastic, but according to another embodiment, the cover 150 may be formed of various materials other than plastic.

FIG. 2 is a circuit diagram according to an embodiment of a driving circuit board on which a plurality of LED elements are mounted in the LED lighting apparatus shown in FIG. 1.

Referring to FIG. 2, the driving circuit board 130 includes an LED driver 140 connected to a power supply unit (not shown) and including a first rectifying unit Re ₁ and a plurality of LED elements.

The first rectifier Re ₁ includes a first diode D ₁ , a second diode D ₂ , a third diode D ₃ , and a fourth diode D ₄ connected in a bridge form. The first rectifier Re ₁ converts AC power supplied from the power supply into DC power. The DC power output from the first rectifying unit Re ₁ , that is, the DC voltage is supplied to the plurality of LEDs 140.

LED driver 140 is supplied with a DC voltage from the first rectifying part (Re ₁₎ is connected to the first holding portion (Re _1). In the LED driver 140, two or more LED elements are connected in series to form a group, and each group is connected in parallel with other groups. Hereinafter, a group formed by connecting two or more LED elements in series will be referred to as an 'LED group'. In the present embodiment, the LED elements included in each of the LED groups L ₁ to L _n may be LED elements of the same type, and the number of LED elements included in each of the LED groups L ₁ to L _n may be the same. Assume that As described above, the LED groups (L ₁ to L _n) have the same number and kind of the LED elements included in each, so to be equal to a current and a voltage applied to each of the LED groups (L ₁ to L _n).

The LED driver 140 shown in FIG. 2 includes the first LED group L ₁ to the Nth LED group L _n each including eight LED elements. The first LED group L ₁ includes eight LED elements L ₁₁ , L ₁₂ , L ₁₃ , L ₁₄ , L ₁₅ , L ₁₆ , L ₁₇ , L ₁₈ , and the second LED group L ₂ ) Includes eight LED elements (L ₂₁ , L ₂₂ , L ₂₃ , L ₂₄ , L ₂₅ , L ₂₆ , L ₂₇ , L ₂₈ ), and the N LED group L _n also includes the first LED group ( Like the L ₁ ) and the second LED group L ₂ , eight LED elements L _n1 ,..., L _n8 are included. Also led groups (L ₁₎ To L _n ) are connected in parallel with other LED groups L ₁ to L _n to receive the same DC voltage from the first rectifying unit Re ₁ .

As shown in FIG. 2, in the LED driving unit 140 according to the present embodiment, the first diode D ₁ and the second diode D _{2 of} the first rectifying unit Re ₁ are the Nth LED group L. As shown in FIG. _n ), and the third diode D ₃ and the fourth diode D _{4 are} connected to the first LED group L ₁ . LED driving part 140 of the N LED groups (L _n) and the first holding portion (Re ₁₎ of the first diode (D ₁₎ and second diode (D ₂₎ is referred to as a first node (N _1), the associated point Let's do it. In addition, a point where the first LED group L _{1 is} connected to the third diode D ₃ and the fourth diode D _{4 will be} referred to as a second node N ₂ .

LED lighting apparatus 100 according to this embodiment, the first node (N ₁₎ of the LED groups from (L ₁ to L _n), the distance and the LED groups (L ₁ to L _n) of the conductive line to each of each The sum of the distances of the conductive lines from to the second node N ₂ is the same. That is, the sum of the distances of the conductive lines from the first node N ₁ to the first LED group L ₁ and the distances of the conductive lines from the first LED group L ₁ to the second node N ₂ is Is equal to the sum of the distances of the conductive lines from the first node N ₁ to the second LED group L ₂ and the distances of the conductive lines from the second LED group L ₂ to the second node N ₂ . Do.

In FIG. 2, between the first node N ₁ and the Nth LED group L _n , between the second node N ₂ and the first LED group L ₁ , and the LED groups L ₁ to L _n. There is no resistance connected between each other. In practice, however, in the LED lighting device 100, between the first node N ₁ and the N LED group L _n , between the second node N ₂ and the first LED group L ₁ , or the LED group The conductive line connecting each of the fields L ₁ to L _n includes a minute resistance (hereinafter referred to as 'conduction line resistance Rc'). Since each of the conductive line resistor Rc and the LED groups L ₁ to L _n is connected in series, when the LED lighting apparatus 100 is driven, the conductive line resistor Rc and the LED groups L ₁ to L _n , respectively, are connected. The DC voltage output from the first rectifier Re ₁ is distributed.

The LED groups (L ₁ to L _n), so have the same conditions of LED elements included in each of the LED groups (L ₁ to L _n) are to emit the same brightness of light in the LED groups (L ₁ to L _n ) The values of the conductive line resistors Rc connected in series with each other must be the same. For example, the first LED group (L ₁₎ and in series with the conductive line resistance associated with the second LED groups (L ₂₎ equal to the resistance of the conductive line resistor connected in series with a first LED group (L ₁₎ and Since the DC voltages applied to the second LED group L ₂ are the same, light of the same brightness can be emitted. In order to make the resistance values of the conductive line resistors Rc connected to each of the LED groups L ₁ to L _n equal to each other, the LED lighting apparatus 100 according to the present embodiment includes an LED group from the first node N ₁ . and the (L ₁ to L _n) the distance and the LED groups the sum of the distance of the conductive line to the second node (N ₂₎ from (L ₁ to L _n), each of the conductive lines to each is equal to all .

When the AC voltage V _input is _input through the input terminal, the first rectifier Re ₁ converts the AC voltage into a DC voltage. Some of the DC voltages output from the first rectifying unit Re ₁ are supplied to each of the LED groups L ₁ to L _n . In addition, the remaining portion of the DC voltage output from the first rectifying unit Re ₁ is also applied to the conductive line resistor Rc connected in series with each of the LED groups L ₁ to L _n . That is, the DC voltage output from the first rectifying unit Re ₁ is applied to the LED groups L ₁ to L _n and the conductive line resistor Rc, respectively. In this case, since each of the LED groups L ₁ to L _n is connected in parallel to each other, the same voltage and the same current are applied to each of the LED groups L ₁ to L _n . Accordingly, light of the same brightness is emitted to each of the LED elements included in the LED groups L ₁ to L _n .

3 is a circuit diagram according to another embodiment of a driving circuit board on which a plurality of LED elements are mounted in the LED lighting apparatus shown in FIG. 1.

Referring to FIG. 3, the driving circuit board 130 is connected to a power supply unit and includes a second rectifying unit Re ₂ and an LED driving unit 140.

The second rectifier Re ₂ includes a fifth diode D ₅ , a sixth diode D ₆ , a seventh diode D ₇ , and an eighth diode D ₈ connected in the form of a bridge.

The LED driver 140 illustrated in FIG. 3 includes the first LED group L ₁ to the Nth LED group L, each of which includes eight LED elements, similarly to the LED groups L ₁ to L _n of FIG. 2. _n ). In addition, each of the LED groups (L ₁ to L _n) is connected in parallel with the other LED groups (L ₁ to L _n) is applied to the same direct voltage.

In the LED driving unit 140, the fifth diode D ₅ and the sixth diode D _{6 of} the second rectifying unit Re ₂ are connected to the Nth LED group L _n , and the seventh diode D _{7 is} provided. And an eighth diode D _{8 is} connected to the first LED group L ₁ . The point where the fifth diode D ₅ and the sixth diode D ₆ of the Nth LED group L _n and the second rectifying unit Re ₂ are connected to the third driving unit N 3 among the LED driving unit 140 is called a third node N ₃ . Let's do it. In addition, a point where the first LED group L _{1 is} connected to the seventh diode D ₇ and the eighth diode D _{8 will be} referred to as a fourth node N ₄ .

LED lighting apparatus 100 according to this embodiment, the third node (N _3), the LED groups (L ₁ to L _n) of the distance and the LED group on the conductive line to each of (L ₁ to L _n) from each The sum of the distances of the conductive lines from to the fourth node N ₄ is the same. For example, the distance of the conductive line from the third node N ₃ to the first LED group L ₁ and the distance of the conductive line from the first LED group L ₁ to the fourth node N ₄ . The sum is the sum of the distances of the conductive lines from the third node N ₃ to the second LED group L ₂ and the distances of the conductive lines from the second LED group L ₂ to the fourth node N ₄ . Is the same as

The LED groups (L ₁ to L _n), so have the same conditions of LED elements included in each of the LED groups (L ₁ to L _n) are to emit the same brightness of light in the LED groups (L ₁ to L _n ) The values of the conductive line resistors Rc connected in series with each other must be the same. In order to make the resistance values of the conductive line resistors Rc connected to each of the LED groups L ₁ to L _n equal to each other, the LED lighting apparatus 100 according to the present embodiment includes an LED group from the third node N ₃ . the (L ₁ to L _n) is the same for both the distance and the LED groups the sum of the distance of the conductive lines (L ₁ to L _n) to the fourth node (n ₄₎ from each of the conductive lines to each.

When the AC voltage V _input is _input through the input terminal, the second rectifier Re ₂ converts the AC voltage into a DC voltage. Some of the DC voltages output from the second rectifier Re ₂ are supplied to each of the LED groups L ₁ to L _n . In addition, the remaining portion of the DC voltage output from the second rectifier Re ₂ is also applied to the conductive line resistor Rc connected in series with each of the LED groups L ₁ to L _n . That is, the DC voltage output from the second rectifier Re ₂ is distributed to the LED groups L ₁ to L _n and the conductive line resistor Rc. In this case, since each of the LED groups L ₁ to L _n is connected in parallel to each other, the same voltage and the same current are applied to each of the LED groups L ₁ to L _n . Accordingly, light of the same brightness is emitted to each of the LED elements included in the LED groups L ₁ to L _n .

While the present invention has been described in connection with what is presently considered to be practical and exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit and scope of the invention. Therefore, the above description and the drawings below should be construed as illustrating the present invention, not limiting the technical spirit of the present invention.

100: LED lighting device 110: cap
111: terminal 120: housing
130: driving circuit board 140: LED driver
150: cover Re ₁ : the first rectifying part
Re ₂ : 2nd rectifier L ₁ : 1st LED group
L ₂ : Second LED Group L _n : N LED Group
D ₁ : first diode D ₂ : second diode
D ₃ : 3rd diode D ₄ : 4th diode
D ₅ : 5th diode D ₆ : 6th diode
D ₇ : 7th Diode D ₈ : 8th Diode
N ₁ : first node N ₂ : second node
N ₃ : third node N ₄ : fourth node

Claims (3)

A rectifier for receiving an AC power input from the outside and converting the same into a DC power source for driving the LED elements;
An LED driver configured to receive the DC power output from the rectifier and drive the LED elements;
The LED drive unit,
A plurality of LED groups including the LED elements;
A conductive line for connecting the LED elements included in the plurality of LED groups and the rectifier,
LED lighting apparatus, characterized in that the resistance value of the conductive line connected to each of the plurality of LED groups are all the same. The method of claim 1,
Each of the plurality of LED groups is connected in parallel with other LED groups,
And the conductive line and each of the plurality of LED groups are connected in series. The method of claim 2,
Each of the plurality of LED groups includes the same LED elements,
The length of the conductive line connected to each of the plurality of LED groups, the LED lighting apparatus, characterized in that each of the plurality of the LED groups are the same.

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