JP2009245790A - Lighting device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lighting fixture applying LEDs for a lighting circuit of high voltage, using a conventional electronic ballast for a fluorescent lamp. <P>SOLUTION: The lighting fixture comprises an AC power source 11, an electronic ballast for a fluorescent lamp (fluorescent tube), resistors 5, 6, and a light-emitting module 7. The electronic ballast 10 for a fluorescent lamp is provided with filament connection terminals 1 to 4, to which filaments of the fluorescent tube are connected. In order to have the electronic ballast 10 recognize, as though the fluorescent tube were connected between the filament connection terminals 1, 2, a resistor 5 and a resistor 6 are used to imitate the filaments in the fluorescent tube. Either of the terminals of the resistor 5 and the resistor 6 are connected to an LED light-emitting module 7, which 7 has LEDs of LED columns connected to each other, to form a matrix-form circuit. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an illumination device using LEDs instead of fluorescent tubes.

  Conventionally, from the viewpoint of power saving, fluorescent lamp luminaires using conventional copper-iron type ballasts have been using electronic ballasts utilizing inverter technology as an alternative to conventional copper-iron type ballasts. Yes. FIG. 4 shows a general lighting circuit of a conventional fluorescent lamp. In FIG. 4, the AC power supply 11, the fluorescent lamp electronic ballast 10, the filament connection terminals 1 to 4 to which the filament is connected, the fluorescent tube 20, and the filaments disposed at both ends of the fluorescent tube, respectively. 21 and 22 are shown.

  Such a fluorescent tube has a characteristic that it can be used continuously by replacing it with a new one when it does not emit light, except for special varieties. However, it is also true that there are many requests for reducing the frequency of replacement because there are many places where the installation and state of the luminaire using the fluorescent tube are not easily replaceable.

  With such a demand, lighting fixtures using LEDs (light-emitting diodes) for which high-luminance elements have been developed have come to the market as lighting elements having a long lifetime. The flow of technology of such lighting fixtures is changing to LEDs with higher brightness.

Note that the LED is not applied as a single element due to restrictions on its luminance and withstand voltage specifications, and is expected to be further technological innovation. Technical Document 1 discloses a structure in which a plurality of light emitting diodes connected in series are opposite to each other at both ends (see Patent Document 1).
JP 2006-107850 A

  However, in the conventional technology as described above, the LED has no compatibility with the conventional fluorescent tube, and the fluorescent tube cannot be simply replaced with the LED.

  This invention is made | formed in view of the above, The objective is to provide the lighting fixture which applied LED to the high voltage lighting circuit using the conventional electronic ballast for fluorescent lamps.

  In order to achieve the above object, the present invention according to claim 1 is an illumination device for illuminating a plurality of LEDs connected to a lighting circuit for lighting a fluorescent tube, Two resistors each having the same electrical resistance value as each of the two filaments of the fluorescent tube and connected to the lighting circuit instead of the filament, a plurality of LED strings connected in series to each other, and two LED arrays arranged in parallel so that the forward directions of the LED rows are opposite to each other, connected between the connection points of the LEDs constituting the LED rows, and connected in a matrix, The LED light emitting module connects the ends of the two resistors.

  According to a second aspect of the present invention, there is provided an illumination device for illuminating a plurality of LEDs connected to a lighting circuit for lighting a fluorescent tube, wherein the two filaments of the fluorescent tube are provided. And two resistors connected to the lighting circuit instead of the filament, a plurality of LED strings connected in series, and the forward direction of the two LED strings. Are arranged in parallel so as to be opposite to each other, and the LED light-emitting modules configured in a matrix form by connecting the connection points of the respective LEDs constituting the LED row to each other and conducting them, and the two LED light-emitting modules Thus, the two ends of the two resistors are connected to each other.

  Further, according to a third aspect of the present invention, in the second aspect, the connection points of the two LED light emitting modules are connected to each other to be conducted in a matrix form.

  ADVANTAGE OF THE INVENTION According to this invention, the lighting fixture which applied LED to the high voltage lighting circuit using the conventional electronic ballast for fluorescent lamps can be provided.

  FIG. 1 shows a circuit diagram of the overall configuration according to the embodiment of the illumination device of the present invention.

  FIG. 1 shows an AC power source 11, a fluorescent lamp (fluorescent tube) electronic ballast 10, resistors 5 and 6, and an LED light emitting module 7. Filament connection terminals 1 to 4 to which filaments of fluorescent tubes are connected are shown.

  In the configuration shown in FIG. 1, when the fluorescent ball electronic ballast 10 is used as it is, the high frequency (near several tens of kilohertz) output by the inverter switching frequency to the filament connection terminals 1 and 2 and the filament connection terminals 3 and 4. AC voltage is generated. In order to recognize between the filament connection terminals 1 and 2 as if the fluorescent tube is connected to the electronic ballast, an electrical resistance element simulating the filament in the fluorescent tube is connected. This electric resistance element is the resistor 5 and the resistor 6 shown in FIG. A resistor 5 is connected between the filament connection terminals 1 and 2, and a resistor 6 is connected between the filament connection terminals 3 and 4.

  Also, one terminal of the resistor 5 and the resistor 6 is connected by the LED light emitting module 7. This LED light-emitting module 7 has a plurality of LEDs (five are shown in FIG. 1 but not limited to this number) connected in series, and two LED rows connected in series. Has been created. The ends of these LED rows are connected so that the forward directions are opposite to each other.

  And the connection point of edge parts is each connected to the one end part of the resistor 5 and the resistor 6, respectively. Further, the connection points where the LEDs in the LED row are connected to each other are connected to each other as shown in FIG. 1 to form a matrix circuit. In this way, LED rows connected in opposite directions can be connected in multiple stages to withstand the output voltage of the fluorescent ballast 10 (an electronic ballast generally generates an AC voltage of 100 V or more at several tens of kilohertz). The number of stages is adjusted as follows. As described above, the LED light emitting module 7 in which the LEDs are connected in a matrix form constitutes a lighting device.

  In this way, the AC high voltage output from the fluorescent lamp electronic ballast 10 for driving the fluorescent tube does not change anything, and although it has a low withstand voltage, the luminance is high and the lifetime is longer than that of the fluorescent tube. An LED is used as a light source. The circuit is devised so that the LED can withstand the AC high voltage, and the LED elements are connected in parallel in opposite directions and connected in multiple stages so that the LED can be lit with the AC high voltage. Further, in order to operate the fluorescent lamp electronic ballast 10 as if it is connected to a fluorescent tube, resistors 5 and 6 having an electrical resistance that simulates a filament in the fluorescent tube are connected. A coil having an impedance equivalent to that of the filament may be used in place of the resistors 5 and 6.

  In addition, the lifetime of the LED is 60,000 hours or more, and when it is assumed that the LED is used for 16 hours a day, it is calculated that the replacement of the light emitter is unnecessary for about 10 years. Once you put it on, you can save the trouble of replacing it at high altitude and time-consuming. In addition, unlike a discharge tube, an LED is less likely to generate electromagnetic noise during lighting. Therefore, the LED is expected to be effective as an illumination tube in a place where a device sensitive to electromagnetic waves is placed.

  Next, FIG. 2 shows a modification of the embodiment shown in FIG.

  In the configuration shown in FIG. 1, the LED light emitting module 7 that has been connected only to one terminal of the resistors 5 and 6 is connected to both terminals of the resistors 5 and 6, and the two LED light emitting modules 7 are also connected. They are connected to each other. The connection points between the LEDs are connected to each other so as to form a matrix circuit.

  Thereby, although the number of LED elements is doubled, one LED light emitting module 9 that can double the luminance is configured. The number of LEDs shown in FIG. 2 is not limited to this, and it is preferable to use a number that can withstand the high voltage output from the fluorescent lamp electronic ballast 10.

  Next, FIG. 3 shows another example of a modification of the embodiment shown in FIG.

  In the configuration shown in FIG. 3, the wiring that has already connected the one LED light emitting module 9 shown in FIG. 2 is omitted, and the LED modules 7 are arranged in two rows. In FIG. 3, the LED module 7 and the LED module 8 are arranged in parallel, and their respective ends are connected to the respective ends of the resistor 5 and the respective ends of the resistor 6. The number of LEDs shown in FIG. 3 is not limited to this, and it is preferable to use a number that can withstand the high voltage output from the fluorescent lamp electronic ballast 10.

  According to the embodiment of the present invention described above, it is possible to provide a luminaire in which an LED is applied to a high voltage lighting circuit using a conventional electronic ballast for a fluorescent lamp.

The circuit diagram of the whole structure based on embodiment of the illuminating device of this invention is shown. The modification based on embodiment of the illuminating device of this invention is shown. The another modification based on embodiment of the illuminating device of this invention is shown. The circuit diagram for lighting the fluorescent lamp in a prior art is shown.

Explanation of symbols

1, 2, 3, 4 ... Filament connection terminal 5, 6 ... Resistor 7, 8, 9 ... LED light emitting module 10 ... Electronic ballast for fluorescent lamp 11 ... AC power supply

Claims (3)

An illumination device for illuminating by emitting a plurality of LEDs connected to a lighting circuit for lighting a fluorescent tube,
Two resistors each having the same electrical resistance value as each of the two filaments of the fluorescent tube and connected to the lighting circuit instead of the filament;
A plurality of LED strings connected in series with each other;
LED light-emitting module arranged in parallel so that the forward directions of the two LED rows are opposite to each other and connected between the connection points of the LEDs constituting the LED rows to be conductive When,
An illuminating device characterized in that one end of each of the two resistors is connected by the LED light emitting module. An illumination device for illuminating by emitting a plurality of LEDs connected to a lighting circuit for lighting a fluorescent tube,
Two resistors each having the same electrical resistance value as each of the two filaments of the fluorescent tube and connected to the lighting circuit instead of the filament;
A plurality of LED strings connected in series with each other;
LED light-emitting module arranged in parallel so that the forward directions of the two LED rows are opposite to each other and connected between the connection points of the LEDs constituting the LED rows to be conductive When,
An illumination device, wherein both ends of the two resistors are connected by the two LED light emitting modules. The lighting device according to claim 2, wherein the connection points of the two LED light emitting modules are connected to each other and are connected to each other to form a matrix.

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