JP2009088343A - LED light source - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an LED light source capable of demonstrating a long life without greatly reducing luminance when only one element is damaged while simplifying a circuit by connecting a plurality of light emitting elements in series.
An LED unit 8 is formed by connecting two light emitting diodes 7 in parallel, and three LED units are electrically separated and arranged in parallel to form a light emitting element 3. While twelve light emitting elements are arranged, independent LED units 8 of the respective light emitting elements are connected in series to form a light emitting element array 9, and the light emitting element arrays are further connected in parallel and arranged on the substrate.
[Selection] Figure 3

Description

  The present invention relates to an LED light source used for a lighting device, a display device, and the like. In particular, although a plurality of light emitting elements are connected in series to simplify a circuit, the luminance is greatly reduced only by breaking one element. The present invention relates to an LED light source that can maintain luminance over a long period of time without deteriorating its life.

LED light sources that use LEDs instead of light sources for illumination such as bulb lamps and fluorescent lamps have been devised, and since these LED light sources have long life and power saving, conventional light sources such as fluorescent lamps and bulb lamps Has begun to spread on behalf of. In this LED light source, when all of a plurality of LED elements are connected in series, there is a merit that a current required for lighting is small and a circuit configuration is simplified. There is a demerit that the whole is extinguished when it is disconnected, and therefore LED elements are connected in parallel in order to extend the life. However, when all of the LED elements are connected in parallel, a large current capacity is required, and the protection circuit and control circuit are arranged by the number of LED elements, resulting in a complicated circuit configuration. There was a problem of becoming. Therefore, a plurality of LED elements are connected in series, and a plurality of columns are prepared and connected in parallel. (See Patent Document 1)
JP 2002-76439 A

  However, in the above-described conventional LED light source, when one LED element is disconnected, no current flows through the series-connected light emitting element array where the element is located, and all the elements are turned off. For example, when the number of columns is five, the luminance of the LED light source is reduced to 4/5. Furthermore, when one LED element in another light emitting element array is disconnected, the luminance is reduced to 3/5, and in the worst case, one LED element is disconnected in each light emitting element array in total. In this case, the entire LED light source is turned off.

  Therefore, the present invention simplifies the circuit by connecting a plurality of light-emitting elements in series, but the luminance is not reduced significantly or the life is not deteriorated if only one element is damaged. An object of the present invention is to provide an LED light source capable of maintaining the above.

  In order to achieve the above-described object, the LED light source of the present invention is configured such that LED units formed by connecting a plurality of light emitting diodes in parallel are connected in series, and the columns of the LED units connected in series are arranged in parallel. It is characterized by being arranged on a substrate.

  According to the present invention, a plurality of LED units formed by connecting a plurality of light emitting diodes in parallel are electrically isolated and arranged in parallel to form a light emitting element, and the LED units of the plurality of light emitting elements are connected to each other. The plurality of light-emitting elements are connected in series to form a light-emitting element array, and the light-emitting element arrays are further connected in parallel.

  Further, the present invention is characterized in that a connecting member is provided so that a plurality of LED light source devices in which light emitting element arrays are connected in parallel can be connected.

  Further, the present invention is characterized in that the light emitting element rows are linearly arranged on the substrate, and the light emitting element rows are covered with a light scattering cover.

  According to the LED light source of the present invention, an LED unit formed by connecting a plurality of light emitting diodes in parallel is connected in series, and the LED units connected in series are arranged on the substrate so as to be arranged in parallel. As a result, even if one light emitting diode in the LED unit is damaged, the remaining light emitting diodes in the LED unit can remain lit, so the light emitting element array in which a plurality of LED units are connected in series is damaged. Light-emitting diodes other than the light-emitting diode can be turned on, and a significant reduction in luminance can be prevented.

  In addition, a plurality of LED units formed by connecting a plurality of light emitting diodes in parallel are electrically isolated from each other to form a light emitting element, and the plurality of LED units of the plurality of light emitting elements are connected to each other. The light emitting element rows of the LED units are connected in series, and the light emitting element rows are further connected in parallel, so that even if one light emitting diode in the LED unit is damaged, the remaining light emitting diodes in the LED unit are Since the lighting can be maintained, the light emitting element array in which a plurality of LED units are connected in series can light up the light emitting diodes other than the damaged light emitting diodes, and is normally connected in series to the light emitting element array. If an element such as a current protection element or current limiting resistor is damaged, only the light emitting element array is affected by other light emitting element arrays. Light emitting diode can be lit, it is possible to prevent a significant decrease in brightness. In addition, by constructing the light emitting element from a plurality of LED units, the number of elements to be mounted in time is reduced and the work man-hour is reduced, and the LED unit is electrically connected in parallel connection, Even if any one of the light emitting diodes is disconnected, the other light emitting diodes can continue to be lit, and the possibility that the entire light emitting element is unlit is reduced.

  In addition, by providing a connecting member so that a plurality of LED light source devices arranged by connecting light emitting element arrays in parallel can be connected, a long and bright LED light source can be obtained, and various lengths can be selected depending on the number of connected light sources. The LED light source can be obtained and can be used as a substitute for the conventional fluorescent lamp.

  In addition, by arranging the light emitting element array in a linear form on the substrate and covering the light emitting element array with a cover that scatters the light, the light from the light emitting element is scattered and a bright LED light source with reduced glare is obtained. It is done.

  1 to 3 show an LED light source 1 according to the present invention, and a plurality of light emitting elements 3 formed as a single independent component on the surface of a substrate 2 (12 in this embodiment). Are arranged in a row. A transparent cover 4 is disposed on the substrate 2 so as to cover all of the plurality of light emitting elements 3, and the cover 4 protects parts on the substrate 2, and transmits light from the light emitting elements 3 to the inner surface of the cover 4. The formed diamond cut scatters light to reduce uneven brightness. As the light scattering by the cover, besides a diamond cut, a cover that is milky white by mixing a scattering material that scatters light may be used.

  Reference numeral 5 denotes a pair of lead terminals disposed at one end of the substrate 2 for connection to a DC power source. The both ends of the substrate 2 are used to supply power when the LED light source 1 is connected in the longitudinal direction. A pair of connectors 6 are provided. By connecting the lead terminal 5 of another LED light source 1 to this connector 6, it becomes possible to connect a plurality of LED light sources 1 in a line. For example, if the total length of one LED light source 1 is about 30 cm, by connecting four LED light sources 1, the total length can be made substantially the same as that of a fluorescent lamp having a total length of about 120 cm. Can be used as an alternative. Although the LED light sources 1 in this case are arranged in series, the electrical connection is made in parallel as shown in FIGS.

Based on FIG.2 and FIG.3, the circuit structure of the LED light source 1 of this invention is demonstrated below.
The light emitting element 3 has a configuration in which three LED units 8 formed by connecting two LEDs 7 in close proximity to each other and arranged in parallel independently are packaged. Six light emitting elements 3 are arranged.
The one six LED units of the light-emitting element 3 ₁ to 3 of ₆ (8 _11, 8 _12, 8 _13), (8 _21, 8 _22, 8 _23), (8 _31, 8 _32, 8 ₃₃₎ In ( ₈₄₁ , ₈₄₂ , ₈₄₃ ), ( ₈₅₁ , ₈₅₂ , ₈₅₃ ), and ( ₈₆₁ , ₈₆₂ , ₈₆₃ ), the six light emitting elements 3 _{1 to} 3 ₆ are skewered. in such a way, LED unit (8 _11), a light-emitting element row 9 ₁ connected in series to the (8 _21), (8 _31), (8 _41), (8 _51), tandem (8 ₆₁₎ formed, also LED unit (8 _12), (8 _22), (8 _32), (8 _42), (8 _52), forming a light-emitting element row 9 ₂ connected in series to the vertical column (8 ₆₂₎ and, and the LED unit (8 _13), (8 _23), (8 _33), (8 _43), (8 _53), to form tandem to the light emitting element row 9 ₃ are connected in series (8 ₆₃₎ In addition, the light emitting element rows 9 ₁ , 9 ₂ , 9 ₃ are connected in parallel.
The distribution of the other six light emitting element 3 _{7-3 12} in the LED unit (8 _71, 8 _72, 8 _73), (8 _81, 8 _82, 8 _83), (8 _91, 8 _92, 8 ₉₃ ), (8 ₁₀₁ , 8 ₁₀₂ , 8 ₁₀₃ ), ( _{81 1 1} , 8 ₁₁₂ , 8 ₁₁₃ ), (8 ₁₂₁ , 8 ₁₂₂ , 8 ₁₂₃ ), the six light emitting elements 3 _{7 to} 3 ₁₂ are connected. The LED units ( ₈₇₁ ), ( ₈₈₁ ), ( ₈₉₁ ), ( ₈₁₁ ), ( ₈₁₁₁ ), ( ₈₁₂₁ ) are connected in series in a vertical row in the form of skewering, and the light emitting element array 9 ₄ and the LED units ( ₈₇₂ ), ( ₈₈₂ ), ( ₈₉₂ ), ( ₈₁₀₂ ), ( ₈₁₁₂ ), ( ₈₁₂₂ ) are connected in series in a vertical row to form a light emitting element array 9 _5. The LED units (8 ₇₃ ), (8 ₈₃ ), (8 ₉₃ ), (8 ₁₀₃ ), (8 ₁₁₃ ), and (8 ₁₂₃ ) are connected in series in a vertical row to form a light emitting element array 9 _6. And form this The light-emitting element row 9 _4, 9 _5, 9 ₆ are connected in parallel.
The light emitting element rows 9 ₁ , 9 ₂ , 9 ₃ and the light emitting element rows 9 ₄ , 9 ₅ , 9 ₆ are also connected in parallel.

Each light emitting element row 9 _{1 to} 9 ₆ is connected in series with current limiting resistors 10 ₁ to 10 ₆ and reverse voltage protection elements 11 _{1 to} 11 ₆ using rectifier diodes. Reference numeral 12 denotes a surge protection element connected in series with the light emitting element rows 9 ₁ , 9 ₂ , 9 ₃ , 9 ₄ , 9 ₅ , 9 ₆ in order to protect the circuit from an excessive voltage such as a lightning surge applied to the power source. Is an overcurrent protection element connected in parallel with the light emitting element arrays 9 ₁ , 9 ₂ , 9 ₃ , 9 ₄ , 9 ₅ , 9 _{6 in} order to prevent an overcurrent from flowing through the circuit.

  In the LED light source 1 of the embodiment described above, even if any of the LEDs 7 is disconnected, as long as all the LEDs 7 in the same LED unit 8 are not disconnected, the LED 7 other than the disconnected LED 7 of the light emitting element 3 has a current. Therefore, lighting of the entire light emitting element 3 can be maintained. Similarly, even in the light emitting element row 9, even if any of the LEDs 7 is disconnected, as long as all the LEDs 7 in the same LED unit 8 are not disconnected, all the six LEDs are disconnected due to current flowing through them. Can be suppressed to light. In addition, when one of the current limiting resistor 10, the reverse voltage protection element 11, and the LED unit 8 is disconnected, the current does not flow to the light emitting element array 9 where the current limiting resistor 10, the reverse voltage protection element 11, and the LED unit 8 are located. The light emitting element array 9 is not affected, and lighting can be maintained. Thereby, the LED light source of the present invention can have a long life.

  In the above-described embodiment, the number of LEDs 7 in the LED unit 8 is two and the number of LED units 8 in the light emitting element 3 is three. However, the present invention is not limited to this. These can be set to a plurality of appropriate numbers.

It is a partial notch explanatory drawing of the LED light source of this invention. It is a circuit diagram of the LED light source of this invention. It is a block diagram of the LED light source of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 LED light source 2 Board | substrate 3 Light emitting element 4 Cover 5 Lead terminal 6 Connector 7 LED
8 LED unit 9 Light emitting element array 10 Current limiting resistor 11 Rectifier diode 12 Surge protection element

Claims (4)

  An LED light source comprising: LED units formed by connecting a plurality of light emitting diodes in parallel; and the LED units arranged on the substrate such that the series of LED units connected in series are arranged in parallel.   A plurality of LED units formed by connecting a plurality of light emitting diodes in parallel are electrically separated and formed in parallel to form a light emitting element, and the LED units of the plurality of light emitting elements are connected to each other to emit the plurality of light emitting elements. 2. The LED light source according to claim 1, wherein the light emitting element rows are connected in series, and the light emitting element rows are further connected in parallel.   3. The LED light source according to claim 1 or 2, further comprising a connecting member so that a plurality of LED light source devices arranged by connecting light emitting element arrays in parallel can be connected.   4. The LED light source according to claim 1, wherein the light emitting element array is linearly arranged on the substrate, and the light emitting element array is covered with a cover that scatters light.

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