JP2001148293A - Lighting equipment system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the equipment maintenace cost and maintenance working amount of a lighting equipment system. SOLUTION: A lighting equipment system is installed with multiple transformers 20A-20M connecting the primary winding in series to a feeding supply wiring 32 and the lighting equipments 10A-10M composed of multiple LED connected in parallel to the both ends of the secondary winding of the transformers. Each LED 11a, 11b...1Nb of the lighting equipment is connected in parallel to the both ends of the secondary winding of the corresponding transformers with opposite polarity each other respectively and AC power is supplied in constant current to the feeding wiring 32 from an DC constant current power supply 31.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lamp system, and more particularly to a lamp system for driving a plurality of lamps using an LED as a light source.

[0002]

2. Description of the Related Art Generally, when a lighting system is installed in a wide range of places, for example, a sign light installed along an airport runway or taxiway, a road, a bridge, a tunnel, a sidewalk, or a large-scale building is used. When used as an illumination lamp installed along an object, it is required to reduce the facility maintenance cost and the amount of maintenance work.

In such a lamp system, as shown in FIG. 7, a configuration using a long-life LED as a light source can be considered. In the figure, reference numerals 81 to 8M denote lamps composed of a plurality of LEDs 73 connected in series, 71 denotes a DC power supply for supplying DC current, and 72 denotes a DC power supply 71 to each lamp 81.
This is a power supply line that supplies DC current to 〜8M. Light 81
8M have the same configuration, and a current limiting resistor 74 is connected in series to each LED 73. The current limiting resistor 74 limits the DC current supplied from the low impedance DC power supply 71 to each of the lamps 81 to 8M to a constant value.

[0004]

However, in such a lamp system, a current limiting resistor is required for each lamp, so that wasteful power consumption is caused by this, and the lamp is heated due to the heat generation. The life of the entire vessel tends to decrease. In addition, since each LED is connected in series, if any one of the LEDs breaks down in the disconnection mode, all the LEDs of the lamp become ineffective, and it is necessary to immediately perform maintenance work. An object of the present invention is to solve such a problem, and an object of the present invention is to provide a lighting system that can reduce equipment maintenance cost and maintenance work amount, and is optimal for installation in a wide range of places.

[0005]

In order to achieve the above object, a lighting system according to the present invention comprises a power supply unit for supplying an AC power supply to a power supply wiring at a constant current; The power supply line is connected in series and the primary side winding is used, and the AC constant current supplied from the power
Consists of a plurality of transformers that output to the secondary winding and a plurality of lamps that are provided for each of these transformers and that are illuminated by alternating currents output to both ends of the secondary winding and that are illuminated by a plurality of LEDs. Each LED of each lamp is connected in parallel to both ends of the secondary winding in directions having opposite polarities. In addition, of the LEDs, approximately half of the LEDs are connected in parallel with each other in a direction having the opposite polarity to the remaining LEDs. As a result, the LED is directly driven by the AC constant current output to the secondary winding of the transformer, and the LEDs are alternately lit according to the connection polarity and the polarity of the AC current.

[0006]

Next, the present invention will be described with reference to the drawings. FIG. 1 is a block diagram of a lamp system according to an embodiment of the present invention.
10M is a lamp unit composed of a plurality of LEDs connected in parallel to each other, 31 is an AC constant current power supply unit that supplies an AC current at a constant current, 20A to 20M are provided for each of the lamp units 10A to 10M, The transformer is a transformer that reduces the voltage of the AC constant current distributed from the unit 31 via the power supply wiring 32 to the corresponding lamp. Each transformer 20A-20M
Are connected in series to the power supply wiring 32.

[0007] Secondary winding 20 of transformers 20A to 20M
Each LED 1 of the corresponding lighting device 10A to 10M at both ends of S
1a, 11b... 1Nb are connected in parallel with each other. In particular, the LEDs 11a, 12a.
2b... 1Nb are connected in parallel so that they have opposite polarities.

Next, the operation of the present invention will be described with reference to FIG. FIG. 2 is a timing chart showing the operation of the present invention. The polarity of the current output from the AC constant current power supply unit 31 alternates at a predetermined frequency. Here, it is assumed that the current flowing from the AC constant current power supply unit 31 toward the transformer 20A has a positive polarity. The period T during which this positive polarity current is output
1, the secondary winding 20S of the transformer 20A has an LE
A secondary current that becomes a forward current to D11a is generated.
Thereby, in the period T1, in addition to the LED 11a, the LED
12a ... 1Na lights up, and the other LEDs 11b, 12b ...
1Nb goes out.

On the other hand, in a period T2 during which a reverse polarity current flowing in a direction opposite to the positive current is output, the secondary winding 20S of the transformer 20A has a reverse current with respect to the LED 11a.
Secondary current is generated. Thereby, in the period T2, the LED
In addition to the LED 11b, the LEDs 12b...
The EDs 11a, 12a... 1Na are turned off.

Thus, each of the transformers 20A-20A
A secondary current having a polarity corresponding to the polarity of the current output from the AC constant current power supply unit 31 is generated in the secondary winding of M.
Then, in each of the lamps 10A to 10M, LEDs connected in parallel with opposite polarities alternately light according to the change in the polarity of the secondary current. Thereby, the life of the LED can be further extended as compared with the case where the LED is constantly turned on. Also,
Since each LED is connected in parallel, one of the LEDs
Even when a failure occurs in the disconnection mode, the entire lamp does not immediately become a point of failure, so the maintenance work interval can be extended, and the burden and cost required for the maintenance work can be greatly reduced.

Further, since the current from the AC constant current power supply unit 31 is output as a constant current, each secondary side current is also a constant current. Therefore, in each of the lamps 10A to 10M, LE
There is no need to limit the current flowing to D, and the need for a current limiting resistor is eliminated. Thus, heat generation in the lamp due to the current limiting resistor is suppressed, wasteful power consumption is eliminated, and a reduction in lamp life due to heat generation is avoided. Furthermore, since the primary current is supplied as a constant current, the LED can be directly driven by the AC secondary current, and a power supply circuit for converting the secondary current into DC and outputting the DC is unnecessary, and the The circuit configuration of the lamp is greatly simplified, the lamp is inexpensive, and a large cost reduction can be achieved in a lamp system requiring a large number of lamps.

Next, an example of the configuration of a lamp used in the present invention will be described with reference to FIG. FIG. 3 is an external view and a cross-sectional view illustrating a configuration example of a lamp. In FIG. 1, reference numeral 2 denotes a disk-shaped light emitting unit in which a large number of LEDs 2A are radially arranged with their light emitting portions facing outward. The light emitting units 2 are arranged in a plurality of layers, here, four layers at predetermined intervals in the vertical direction via a spacer 1S. The lowermost light emitting unit 2 is mounted on the substrate mounting base 1D via the spacer 1S.

The board mounting base 1D is screwed to the central projection 1E of the disk-shaped mounting base 1C. The mounting base 1C is screwed to a bowl-shaped adjustment seat 1B having a hole 1F at the bottom. The adjustment seat 1B is a hole 1 from the upper opening side.
By the lower pedestal 1A and the thumb screw 1G fitted in F,
It is screwed to lower pedestal 1A in a desired direction and inclination. These lower pedestal 1A, adjustment seat 1B and mounting base 1C
The pedestal 1 is constituted. A power cord 5 for supplying power for lighting to each light emitting unit 2 is inserted inside through a hole in the center of the lower pedestal 1A, and a pair of lowermost light emitting units 2 through a hole in the mounting base 1C. Connected to electrodes.

Each light-emitting unit 2 is covered with a cylindrical cover 3 having a bottom and opening downward. The cover 3 has a belt-like mounting member 4A whose peripheral edge 3A is a belt-like mounting member 4A.
B is fastened to the peripheral portion 1H and is fixed by the fastener 4B. A pair of electrodes of each light emitting unit 2 is
Each of the light emitting units 2 is connected in common, and the power from the power cord 5 is supplied in parallel to a pair of electrodes of each light emitting unit 2. Then, a number of LEDs 2 </ b> A connected in parallel between the pair of electrodes are turned on, and the light is radiated to the outside via the cover 3.

FIGS. 4A and 4B are configuration diagrams showing details of the light emitting unit, wherein FIG. 4A is a top view of the light emitting unit, FIG. 4B is a front view of the light emitting unit, and FIG. . As shown in FIGS. 4A and 4B, the light emitting unit 2 has a printed circuit board 2B having a hole 40 in the center, and is radially attached to a peripheral portion of the printed circuit board 2B with the light emitting unit located outside. And a large number of LEDs 2A. On the upper and lower surfaces of the printed circuit board 2B, a pair of electrodes 4 composed of a wide conductive pattern covering the entire surface is provided.
1, 42 are formed. The wiring cord 5 </ b> A and the power supply cord 5 are connected to the vicinity of the hole 40 of each of the electrodes 41 and 42 via the hole 40.

As shown in FIG. 4C, the printed circuit board 2B includes a pair of electrodes 41 and 42 and an insulating layer 40A for insulating these electrodes at a predetermined interval. Each LED 2A has two lead terminals 45, 4 individually connected to the respective cathode and anode.
6, the printed circuit board 2B is attached so as to sandwich the printed circuit board 2B from the outer peripheral side. Here, the lead terminal 45 is connected and fixed to the electrode 41 by soldering 43, and the lead terminal 46 is connected to the electrode 4.
2 is connected and fixed by soldering 44.

FIG. 5 shows a connection configuration example of each light emitting unit. LED2A of each light emitting unit 50A-50K
Are connected in parallel to a pair of electrodes such that approximately half of the LEDs have the opposite polarity to the remaining LEDs. The light emitting units 50A to 50K are connected in parallel to the power cord 5 with the same polarity. Therefore, by supplying AC power from the power supply cord 5, in the light emitting units 50A to 50K, approximately half of the LEDs are alternately turned on according to the polarity change of the power supply.

As for the connection method of the LEDs 2A, as shown in FIG. 6, all the LEDs in the light emitting units are connected in parallel with the same polarity, and approximately half of the light emitting units have the opposite polarity. May be connected in parallel so that they have opposite polarities. Thereby, the same operation and effect as those of the configuration example of FIG. 4 can be obtained.
There is no need to change the polarity of the ED and mount the ED. By setting the number of light emitting units to be an even number, even if the alternating current has a low frequency, the amount of light of the entire lamp does not change depending on the polarity, and thus a flickering feeling can be suppressed. When a plurality of light-emitting units are arranged in a layer, the LEDs of each light-emitting unit may be arranged at intervals such that the LEDs are integrated and recognized as one light source. In addition, one LE
When sufficient luminance is obtained in D, one light emitting unit may be used.

The life time of an LED is generally about 20,000 hours, which is about 10 times as long as that of a halogen lamp. Therefore, by using the LED as the light source, the replacement cycle of the light source can be greatly extended as compared with the conventional marker lamp using the halogen lamp as the light source, and the replacement work load required for maintaining the equipment can be greatly reduced. . Since each LED is radially arranged on the outer periphery of a pair of disk-shaped electrodes with its light-emitting portion facing outward, there is no need to provide an optical lens such as a Fresnel lens separately from the light source as in the related art. The structure of the marker lamp can be greatly simplified. In this case, it is desirable to arrange the LEDs at equal angular intervals,
The LEDs may be arranged only in the required angular directions.

Further, since one pair of electrodes is formed of a disc-shaped conductive material and each LED is arranged on the outer periphery thereof,
Power can be supplied to D at almost the same potential, the variation in luminance due to the arrangement position of the LEDs can be extremely reduced, and light of the same intensity can be emitted in all the angular directions, and the heat generated by the LEDs can be reduced. Heat can be dissipated by the electrodes. In addition, since the conductive thin films formed on both sides of the printed circuit board are used as the electrodes, and the LEDs are arranged on the outer peripheral edge, the electrodes can be formed at low cost and the LEDs can be easily supported radially. Since each LED was connected in parallel,
If a constant current power supply is used as the power supply,
Even if D fails and becomes unlit, the current to the other LEDs increases, and it is possible to automatically compensate for the decrease in brightness of the entire marker lamp.

[0021]

As described above, according to the present invention, a plurality of transformers in which a primary winding is connected in series to a power supply wiring, and each of these transformers is connected in parallel to both ends of a secondary winding thereof. A plurality of LED lamps, each LED of the lamp is connected in parallel to both ends of a secondary winding of a corresponding transformer in a direction of opposite polarities, and an AC power supply is connected to a power supply wiring. By supplying the current, the LED of the lamp is directly driven by the AC constant current output to the secondary winding of the transformer, and each LED is driven according to the connection polarity of the LED and the polarity of the AC constant current. Lights alternately. As a result, wasteful power consumption due to the current limiting resistor can be suppressed as compared with the case where the LEDs connected in series are driven by a direct current, and the life of the lamp as a whole due to the heat generation can be prevented from being shortened. Further, even if any one of the LEDs fails in the disconnection mode, all the LEDs of the lamp do not immediately become a fault. Therefore, the equipment maintenance cost and the amount of maintenance work can be reduced, and a lamp system optimal for installation in a wide range can be realized.

[Brief description of the drawings]

FIG. 1 is a block diagram of a lighting system according to an embodiment of the present invention.

FIG. 2 is a timing chart showing the operation of the present invention.

FIG. 3 is an external view and a cross-sectional view illustrating a configuration example of a lamp.

FIG. 4 is a configuration diagram showing details of a light emitting unit.

FIG. 5 is a circuit diagram showing a connection configuration example of each light emitting unit.

FIG. 6 is a circuit diagram showing another connection configuration example of each light emitting unit.

FIG. 7 is a circuit diagram showing a conventional lamp system.

[Explanation of symbols]

10A to 10M: lamp, 20A to 20M: transformer, 3
1: AC constant current power supply unit, 32: Power supply wiring, 11a to 1N
b ... LED.

Claims (2)

[Claims] A power supply unit configured to supply an AC power to the power supply line at a constant current; a power supply unit connected in series to the power supply line, the power supply line serving as a primary winding, and supplied from the power supply unit. A plurality of transformers that output the AC constant current to the secondary winding, and a plurality of LEDs that are provided for each of the transformers and are lit by the AC constant current output to both ends of the secondary winding. A lamp system, wherein each LED of each of the lamps is connected in parallel to both ends of the secondary winding in directions having opposite polarities to each other. 2. The lamp system according to claim 1, wherein substantially half of the LEDs are connected in parallel with each other in a direction having a polarity opposite to that of the remaining LEDs. Instrument system.