JP2011060691A - Led lighting system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fluorescent lamp type LED (light emitting diode) lighting system having reduced noises. <P>SOLUTION: The LED lighting system includes: a light emitting part 11 having one or more light emitting diodes; a pair of electrodes 12, 13; a peripheral circuit 14 for supplying electric power from the pair of electrodes 12, 13 to the light emitting part 11; a peripheral circuit board 15 having a main face and a reverse face, and having the peripheral circuit 14 arranged on the main face; first and second ferrite core parts 16, 17 having ferrite cores through which cables connecting the pair of electrodes 12, 13 to the peripheral circuit 14 pass, respectively; and a metal shield film 20 provided on the reverse face of the peripheral circuit board 15. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an LED illumination device using a light emitting diode as a light source.

  In recent years, light emitting diodes (LEDs) have been used in lighting devices from the viewpoint of power consumption and light source lifetime. In addition, among lighting devices using the light emitting diode as a light source, there is a fluorescent lamp type that can be attached to a widely used existing fluorescent lamp fixture (see, for example, Patent Documents 1 and 2).

JP 2006-100036 A JP 2007-12322 A

  However, since such a fluorescent lamp type LED lighting apparatus usually includes a power supply circuit and the like, there is a problem in that noise such as radiation interference waves (unwanted radiation), noise terminal voltage, interference power, etc. is generated. there were.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a fluorescent lamp type LED lighting device that takes measures against noise.

  In order to achieve the above object, an LED lighting apparatus according to the present invention is a fluorescent lamp type LED lighting apparatus, and emits power from a light emitting unit having one or more light emitting diodes, a pair of electrodes, and a pair of electrodes. A peripheral circuit substrate is a substrate having a peripheral circuit to be supplied to a portion, a main surface and a back surface, the peripheral circuit substrate being a substrate on which the peripheral circuit is disposed on the main surface, and a metal shield film provided on the back surface side of the peripheral circuit substrate And.

  With such a configuration, noise such as unnecessary radiation generated from the peripheral circuit can be shielded by the metal shield film. For example, when noise such as unnecessary radiation is generated from a power supply circuit included in the peripheral circuit, the noise can be shielded.

In the LED lighting device according to the present invention, the metal shield film may be a copper film.
With such a configuration, shielding can be performed more effectively than in the case where another metal film is used as the metal shield film.

In the LED lighting device according to the present invention, the peripheral circuit board and the metal shield film may be a multilayer board or a double-sided board formed integrally.
With such a configuration, the number of assembling steps is reduced at the time of assembling the LED lighting device, and the assembling workability is improved.

In the LED lighting device according to the present invention, the pair of electrodes are the first electrode and the second electrode, the first cable connecting the first electrode and the peripheral circuit, the second electrode, and the periphery. A second cable connecting the circuit, a first ferrite core portion having one or more ferrite cores through which the first cable passes, and a second ferrite core having one or more ferrite cores through which the second cable passes And a section.
With such a configuration, by using the metal shield film and the ferrite core, it is possible to remove noise such as radiation interference wave (unwanted radiation), noise terminal voltage, interference power, and the like.

  In the LED lighting device according to the present invention, the first electrode has a first electrode pin and a second electrode pin, and the second electrode has a third electrode pin and a fourth electrode pin. The first cable is a cable that connects the first electrode pin and the peripheral circuit, and a cable that connects the second electrode pin and the peripheral circuit. The second cable is the third electrode pin and the peripheral circuit. And a cable connecting the fourth electrode pin and the peripheral circuit.

  With such a configuration, for example, in a straight tube fluorescent lamp type LED lighting device or a ring-shaped (annular) fluorescent lamp type LED lighting device, noise using a ferrite core through which a cable connecting each electrode and a peripheral circuit passes. Can be removed.

In the LED lighting device according to the present invention, the first ferrite core portion is a ferrite through which both a cable connecting the first electrode pin and the peripheral circuit and a cable connecting the second electrode pin and the peripheral circuit pass. The second ferrite core portion has a ferrite core through which both a cable connecting the third electrode pin and the peripheral circuit and a cable connecting the fourth electrode pin and the peripheral circuit pass. Also good.
With such a configuration, so-called common mode noise can be removed.

In the LED lighting device according to the present invention, the first ferrite core portion includes only a ferrite core through which only a cable connecting the first electrode pin and the peripheral circuit passes, and a cable connecting the second electrode pin and the peripheral circuit. And the second ferrite core portion includes only a ferrite core through which a cable connecting the third electrode pin and the peripheral circuit passes, and a cable connecting the fourth electrode pin and the peripheral circuit. And a ferrite core that passes therethrough.
With such a configuration, so-called normal mode noise can be removed.

  According to the LED illumination device of the present invention, noise such as unnecessary radiation generated from the peripheral circuit can be shielded by the metal shield film.

The schematic diagram which shows the structure of the LED lighting apparatus by Embodiment 1 of this invention. The figure for demonstrating the relationship between the peripheral circuit board and metal shield film in the embodiment The figure which shows the structure of the 1st ferrite core part in the embodiment The figure which shows the structure of the 2nd ferrite core part in the embodiment

  Hereinafter, an LED lighting device according to the present invention will be described using embodiments. Note that, in the following embodiments, the components given the same reference numerals are the same or equivalent, and repetitive description may be omitted.

(Embodiment 1)
The LED lighting device according to Embodiment 1 of the present invention will be described with reference to the drawings. The LED lighting device according to the present embodiment has a metal shield film.

  FIG. 1 is a block diagram showing a configuration of an LED lighting device 1 according to the present embodiment. FIG. 2 is a diagram for explaining the relationship between the peripheral circuit board 15 and the metal shield film 20 in the LED lighting device 1 according to the present embodiment. 3 and 4 are diagrams showing the configuration of the first and second ferrite core portions 16 and 17 in the LED lighting device 1 according to the present embodiment.

  The LED lighting device 1 according to the present embodiment is of a straight tube fluorescent lamp type, and includes a light emitting unit 11, a first electrode 12, a second electrode 13, a peripheral circuit 14, and a peripheral circuit substrate 15. The first ferrite core part 16, the second ferrite core part 17, the first cable 18, the second cable 19, and the metal shield film 20 are provided. The LED lighting device 1 is used by being attached to an existing fluorescent lamp fixture.

  The light emitting unit 11 includes one or more light emitting diodes 11a. The one or more light emitting diodes 11 a are the light source of the LED lighting device 1. The one or more light emitting diodes 11a may be, for example, white light emitting diodes or light emitting diodes of other colors. The light emitting section 11 is usually an array of a plurality of light emitting diodes 11a (LED array), but this need not be the case. The light emitting diode 11a may be a bullet type, a flat type, or a chip type (surface mount type). The one or more light emitting diodes 11a are normally disposed on the LED substrate 21 shown in FIG. 2, but this need not be the case. In FIG. 1, the LED substrate 21 is not shown for convenience of explanation.

  The first electrode 12 includes a first electrode pin 12a and a second electrode pin 12b. The second electrode 13 includes a third electrode pin 13a and a fourth electrode pin 13b. The first and second electrode pins 12a and 12b are attached to one socket to which a straight tube fluorescent lamp is attached, and the third and fourth electrode pins 13a and 13b are straight tube fluorescent lamps. It is attached to the other socket to be attached.

  The peripheral circuit 14 supplies power from the pair of electrodes 12 and 13 to the light emitting unit 11. Usually, the electric power supplied from the pair of electrodes 12 and 13 is alternating current, and thus is rectified in the peripheral circuit 14. That is, the peripheral circuit 14 may include a rectifier circuit such as a diode bridge, for example. Further, the peripheral circuit 14 may supply the light emitting unit 11 with electric power in which the rectified direct current and / or voltage is controlled. Therefore, the peripheral circuit 14 may include, for example, a current control circuit, a voltage control circuit, and the like. A circuit that controls the current and voltage is sometimes called a power supply circuit. Further, in order to remove noise of power supplied from the pair of electrodes 12 and 13, the peripheral circuit 14 may have a filter circuit having a capacitor and a coil. For example, the peripheral circuit 14 may include a rectifier circuit and a power supply circuit that controls a rectified direct current and / or voltage. The configuration of the peripheral circuit 14 is arbitrary. For example, there are some examples of peripheral circuits in Patent Documents 1 and 2 described above, but these may be used, or other configurations may be used.

  The peripheral circuit board 15 is a board on which the peripheral circuit 14 is disposed. The peripheral circuit board 15 has two surfaces. For the sake of convenience, one of the peripheral circuit boards 15 is called a main surface and the other is called a back surface. That is, the peripheral circuit board 15 has a main surface and a back surface. The peripheral circuit 14 is assumed to be disposed on the main surface. As shown in FIG. 2, the peripheral circuit board 15 and the LED board 21 described above may be integrated (FIG. 2A) or may be separate boards (FIG. 2). 2 (b)). In FIG. 2B, it is assumed that a plurality of light emitting diodes 11a are disposed on the surface of the LED substrate 21 opposite to the metal shield film 20 (the upper surface in the drawing). For example, the peripheral circuit board 15 and the LED board 21 may be a single-sided board, or may be a multilayer board or a double-sided board.

  The first ferrite core part 16 has one or more ferrite cores through which the first cable 18 passes. The first cable 18 connects the first electrode 12 and the peripheral circuit 14. In the present embodiment, as shown in FIGS. 1 and 3, the first cable 18 is a cable 18a and a cable 18b. The cable 18 a is a cable that connects the first electrode pin 12 a and the peripheral circuit 14. The cable 18b is a cable for connecting the second electrode pin 12b and the peripheral circuit 14.

  In the present embodiment, as shown in FIG. 3A, the first ferrite core portion 16 has ferrite cores 16a to 16c. The ferrite core 16a is a ferrite core through which both the cable 18a and the cable 18b pass. The ferrite core 16a attenuates common mode noise flowing through the cables 18a and 18b. The ferrite core 16b is a ferrite core through which only the cable 18a passes. The ferrite core 16b attenuates normal mode noise flowing through the cable 18a. The ferrite core 16c is a ferrite core through which only the cable 18b passes. The ferrite core 16c attenuates normal mode noise flowing through the cable 18b. The positional relationship between the ferrite cores 16a to 16c is not limited to that shown in FIG. 3 (a), and may be as shown in FIGS. 3 (b) to 3 (d).

  The second ferrite core portion 17 has one or more ferrite cores through which the second cable 19 passes. The second cable 19 connects the second electrode 13 and the peripheral circuit 14. In the present embodiment, as shown in FIGS. 1 and 4, the second cable 19 is a cable 19a and a cable 19b. The cable 19 a is a cable that connects the third electrode pin 13 a and the peripheral circuit 14. The cable 19b is a cable that connects the fourth electrode pin 13b and the peripheral circuit 14. Each cable in the present embodiment is a good conductor.

  In the present embodiment, as shown in FIG. 4A, the second ferrite core portion 17 includes ferrite cores 17a to 17c. The ferrite core 17a is a ferrite core through which both the cable 19a and the cable 19b pass. The ferrite core 17a attenuates common mode noise flowing through the cables 19a and 19b. The ferrite core 17b is a ferrite core through which only the cable 19a passes. The ferrite core 17b attenuates normal mode noise flowing through the cable 19a. The ferrite core 17c is a ferrite core through which only the cable 19b passes. The ferrite core 17c attenuates normal mode noise flowing through the cable 19b. The positional relationship between the ferrite cores 17a to 17c is not limited to that shown in FIG. 4A, and may be as shown in FIGS. 4B to 4D.

  Each ferrite core described above has a ring shape (donut shape), and is used by passing a cable through the hole. The size of the ferrite core and the number of turns of the cable passed through the hole of the ferrite core can be appropriately selected according to the frequency of noise to be removed. 3 and 4 show the case of two turns for all the ferrite cores, the present invention is not limited to this. The ferrite core may be of an integral molding type or a clamp type (split type).

  The metal shield film 20 is a shield film provided on the back side of the peripheral circuit board 15 as shown in FIG. The metal shield film 20 is a metal film, for example, a copper film, an aluminum film, or another metal film. According to the inventors' experiment, the shielding effect was higher when the metal shield film 20 was a copper film than when the metal shield film 20 was an aluminum film. It is presumed that the copper film has a stronger shield and can be expected to be shielded by the use of stray capacitance. Further, it is preferable that one or both surfaces of the metal shield film 20 are covered with an insulating film.

  The metal shield film 20 may be provided later on the back surface of the peripheral circuit board 15. That is, the metal shield film 20 may be attached to the back surface of the peripheral circuit board 15 or provided by other methods. In that case, the metal shield film 20 may be provided on the entire surface of the peripheral circuit board 15 or a part thereof. In the latter case, for example, the peripheral circuit 14 may be provided on the back surface of a circuit that emits an electromagnetic wave to be shielded, for example, a power supply circuit. In addition, the LED lighting device 1 includes an LED substrate 21 on which one or more light emitting diodes 11a are disposed. For example, as shown in FIG. 2A, the peripheral circuit substrate 15 and the LED substrate 21 Is integrally formed, the metal shield film 20 may be provided on the back surface of the peripheral circuit board 15, and as shown in FIG. 2 (b), the peripheral circuit board 15 and the LED board 21 are separate, When the two substrates are overlapped, the metal shield film 20 may be provided on the back surface of the peripheral circuit substrate 15 and between the peripheral circuit substrate 15 and the LED substrate 21. When the peripheral circuit board 15 and the LED board 21 are integrated, the peripheral circuit board 15 may exist on both sides of the LED board 21 as shown in FIG. In that case, as shown in FIG. 2 (e), the metal shield film 20 may be provided on the entire back surface of the peripheral circuit board 15 and the LED substrate 21, or the back surface of the peripheral circuit board 15 may be provided. Only the metal shield film 20 may be provided. In addition, by providing the metal shield film 20 on the back surface side of the LED substrate 21, the effect of preventing noise is further increased. This is because a signal for turning on the light emitting diode 11a is often not a pure DC signal (DC signal without ripple), and therefore noise from the LED substrate 21 may be generated.

  The peripheral circuit board 15 and the metal shield film 20 may be a multilayer board or a double-sided board formed integrally. In this case, one substrate is the peripheral circuit substrate 15 and includes the metal shield film 20. In that case, for example, as shown in FIG. 2C, the metal shield film 20 may exist inside the peripheral circuit board 15 (multilayer board), or as shown in FIG. Thus, the metal shield film 20 may exist on the back surface of the peripheral circuit board 15 (double-sided board). Further, as shown in FIG. 2F, when the peripheral circuit board 15 and the LED board 21 are integrated, the integrated board itself is a multilayer board including the metal shield film 20 inside. Also good. In the case shown in FIG. 2F, the one or more light emitting diodes 11a may be provided on the same surface as the peripheral circuit 14, or may be provided on the opposite surface. Further, instead of the multilayer substrate, a double-sided substrate having the metal shield film 20 on the back surface may be used. When the peripheral circuit board 15 and the metal shield film 20 are a multilayer board or a double-sided board formed integrally, a metal film (usually copper foil) or a board inside the board corresponding to the metal shield film 20 The metal film (usually copper foil) on the surface is a so-called solid pattern. This is to shield the entire board. When the peripheral circuit board 15 and the metal shield film 20 are multilayer boards, one or more light emitting diodes are provided on the back surface of the multilayer board (that is, the surface opposite to the face on which the peripheral circuit 14 is provided). 11a may be provided. That is, the multilayer substrate may serve as the peripheral circuit substrate 15, the metal shield film 20, and the LED substrate 21.

  As described above, the metal shield film 20 is not limited in its configuration as long as it is provided on the back surface side of the peripheral circuit board 15. Here, the back side means the meaning of the back side itself of the peripheral circuit board 15 (for example, FIG. 2A, FIG. 2B, FIG. 2D, FIG. In the case of FIG. 2 (c), FIG. 2 (f), the position may be closer to the back surface than the main surface of the peripheral circuit board 15 (that is, the position of the inner layer of the substrate). ). Further, the metal shield film 20 may be at least a film shape and may be a plate shape.

  As described above, according to the LED lighting device 1 according to the present embodiment, the metal shielding film 20 is provided on the back surface side of the peripheral circuit 14, so that the LED lighting device 1 is attached to an existing lighting fixture for use. In this case, noise radiated from the peripheral circuit 14 can be shielded by the metal shield film 20. In addition, since the first and second ferrite core portions 16 and 17 are provided, noise can be removed between the peripheral circuit 14 and the electrodes 12 and 13 using the ferrite core. As a result, the LED lighting device 1 according to the present embodiment does not emit more noise than the conventional fluorescent lamp type LED lighting device. In addition, when the peripheral circuit 14 has a filter circuit, it is more preferable to reduce noise using a ferrite core.

  Usually, a fluorescent lamp is often provided in a place where human activities are performed. That is, it is often provided on the ceiling or desk of an office or home. In this case, if the fluorescent lamp is replaced with a conventional fluorescent lamp type LED lighting device, noise will be emitted to a region where human activity is active. By switching to the device 1, the noise emission can be suppressed. In particular, as shown in FIG. 2B, the peripheral circuit board 15 exists on the opposite side of the LED substrate 21 from the light emitting diode 11 a, and the metal shield film 20 exists between the LED board 21 and the peripheral circuit board 15. In this case, unnecessary radiation generated from the peripheral circuit 14 can be prevented from being output to the LED substrate 21. As a result, it is possible to prevent unnecessary radiation from being emitted in an area where a human is active.

  In addition, in this Embodiment, although the case where the LED lighting apparatus 1 was a thing of a straight tube fluorescent lamp type was demonstrated, it may not be so. The LED illumination device 1 may be, for example, an annular (annular) fluorescent lamp type or a bulb-type fluorescent lamp type. Even when the LED lighting device 1 is a ring-shaped fluorescent lamp type, each electrode has two electrode pins, and thus the same as described above. On the other hand, when the LED lighting device 1 is of a light bulb type fluorescent lamp type, the first electrode 12 and the second electrode 13 correspond to the two electrodes of the base of the light bulb type fluorescent lamp, respectively. . In the case of a bulb-type fluorescent lamp, only one terminal (corresponding to an electrode pin) exists for each of the first and second electrodes 12 and 13. Therefore, the number of ferrite cores existing in the first ferrite core portion 16 and the second ferrite core portion 17 is one.

  Further, in the present embodiment, the case where the first ferrite core portion 16 includes the three ferrite cores 16a to 16c has been described. The first ferrite core portion 16 may include only the ferrite core 16a, may include the ferrite cores 16b and 16c, or may include any other one or two ferrite cores. Also good. Further, the number of ferrite cores used in the common mode and the normal mode may be one or more, and the number is not limited. That is, two or more ferrite cores may be used to attenuate common mode noise, and two or more ferrite cores may be used to attenuate normal mode noise.

  Moreover, although the 2nd ferrite core part 17 demonstrated the case where the 2nd ferrite core part 17 has the three ferrite cores 17a-17c in this Embodiment, it may not be so. The second ferrite core portion 17 may include only the ferrite core 17a, may include the ferrite cores 17b and 17c, or may include any other one or two ferrite cores. Also good. Further, the number of ferrite cores used in the common mode and the normal mode may be one or more, and the number is not limited. That is, two or more ferrite cores may be used to attenuate common mode noise, and two or more ferrite cores may be used to attenuate normal mode noise.

  Moreover, although this Embodiment demonstrated the case where the LED lighting apparatus 1 was provided with the 1st and 2nd ferrite core parts 16 and 17, it may not be so. The LED lighting device 1 may not include the first and second ferrite core portions 16 and 17. In that case, at least one of the first electrode 12 and the second electrode 13 may be directly connected to the peripheral circuit 14 without a cable. In that case, the LED lighting device 1 may not include at least one of the first and second cables 18 and 19.

  Further, the present invention is not limited to the above-described embodiment, and various modifications are possible, and it goes without saying that these are also included in the scope of the present invention.

  As described above, according to the LED lighting device and the like according to the present invention, an effect that noise can be reduced is obtained, and it is useful as a fluorescent lamp type LED lighting device used in place of a fluorescent lamp.

DESCRIPTION OF SYMBOLS 1 LED illumination apparatus 11 Light emission part 11a Light emitting diode 12 1st electrode 12a 1st electrode pin 12b 2nd electrode pin 13 2nd electrode 13a 3rd electrode pin 13b 4th electrode pin 14 Peripheral circuit 15 Peripheral circuit Substrate 16 First ferrite core portion 16a, 16b, 16c, 17a, 17b, 17c Ferrite core 17 Second ferrite core portion 18 First cable 18a, 18b, 19a, 19b Cable 19 Second cable 20 Metal shield film 21 LED board

Claims (7)

A fluorescent lamp type LED lighting device,
A light emitting unit having one or more light emitting diodes;
A pair of electrodes;
A peripheral circuit for supplying power from the pair of electrodes to the light emitting unit;
A peripheral circuit board having a main surface and a back surface, wherein the peripheral circuit is a substrate disposed on the main surface;
An LED lighting device comprising: a metal shield film provided on a back surface side of the peripheral circuit board. The LED lighting device according to claim 1, wherein the metal shield film is a copper film. The LED lighting device according to claim 1, wherein the peripheral circuit board and the metal shield film are a multilayer board or a double-sided board formed integrally. The pair of electrodes are a first electrode and a second electrode,
A first cable connecting the first electrode and the peripheral circuit;
A second cable connecting the second electrode and the peripheral circuit;
A first ferrite core portion having one or more ferrite cores through which the first cable passes;
The LED lighting device according to any one of claims 1 to 3, further comprising a second ferrite core portion having one or more ferrite cores through which the second cable passes. The first electrode has a first electrode pin and a second electrode pin,
The second electrode has a third electrode pin and a fourth electrode pin,
The first cable is a cable for connecting the first electrode pin and the peripheral circuit, and a cable for connecting the second electrode pin and the peripheral circuit,
The LED lighting device according to claim 4, wherein the second cable is a cable that connects the third electrode pin and the peripheral circuit, and a cable that connects the fourth electrode pin and the peripheral circuit. The first ferrite core portion has a ferrite core through which both a cable connecting the first electrode pin and the peripheral circuit and a cable connecting the second electrode pin and the peripheral circuit pass.
The second ferrite core portion includes a ferrite core through which both a cable connecting the third electrode pin and the peripheral circuit and a cable connecting the fourth electrode pin and the peripheral circuit pass. Item 6. The LED illumination device according to Item 5. The first ferrite core section includes a ferrite core through which only a cable connecting the first electrode pin and the peripheral circuit passes, and a ferrite core through which only a cable connecting the second electrode pin and the peripheral circuit passes. Have
The second ferrite core portion includes a ferrite core through which only a cable connecting the third electrode pin and the peripheral circuit passes, and a ferrite core through which only a cable connecting the fourth electrode pin and the peripheral circuit passes. The LED lighting device according to claim 5, comprising:

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