JPH0589981A - Discharge lamp lighting device - Google Patents

Abstract

PURPOSE:To provide a discharge lamp lighting device capable of extending the life of a high pressure discharge lamp and reducing labor required for maintenance work as for replacement. CONSTITUTION:A pulse voltage of the positive level and a pulse voltage of the negative level are sequentially generated each time a power source 10 is connected to a circuit. When a pulse voltage of the positive level is generated, it is superimposed on the positive half-cycle waveform of alternating voltage and is applied between the electrode 3a and the proximity conductor 3c of a high pressure discharge lamp 3; thereby the high pressure discharge lamp 3 is started and lighted. When a pulse voltage of the negative level is generated, it is superimposed on the negative halfcycle waveform of alternating voltage and is applied between the electrode 2b and the proximity conductor 2c of a high pressure discharge lamp 2; thereby the high pressure discharge lamp 2 is started and lighted.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a discharge lamp lighting device for lighting a high pressure discharge lamp.

[0002]

2. Description of the Related Art As lighting equipment used for road lighting and tunnel lighting, there are high-pressure discharge lamps such as high-pressure sodium lamps and metal halide lamps. This high-pressure discharge lamp has the same life as a general incandescent light bulb, and requires regular or necessary replacement work.

[0003]

However, the high-pressure discharge lamp is often installed outdoors and at a high place, and in reality, a great deal of labor is required for maintenance such as replacement. This invention takes the above circumstances into consideration,

In the discharge lamp lighting device according to any one of claims 1 to 3, it is an object to extend the life of the high pressure discharge lamp, thereby reducing the labor required for maintenance such as replacement. ..

[0005]

According to another aspect of the present invention, there is provided a discharge lamp lighting device comprising: a plurality of high pressure discharge lamps having starting auxiliary conductors having polarities different from each other and being started by receiving a pulse voltage; The ballast that is inserted and connected between the connections, the pulse generator that is connected to the ballast and that emits a positive-level or negative-level pulse voltage for starting when energized, and the polarity of the pulse voltage that is generated by the pulse generator are described above. And a control unit that switches each time the power is turned on.

According to another aspect of the present invention, there is provided a discharge lamp lighting device, wherein a plurality of high pressure discharge lamps having starting auxiliary conductors having polarities different from each other and started by receiving a pulse voltage are inserted and connected between the discharge lamp and a power source. A ballast, a pulse generator that is connected to the ballast and that emits a positive-level or negative-level pulse voltage for starting when energized, and a unit that selects the polarity of the pulse voltage emitted from the pulse generator.

According to another aspect of the present invention, there is provided a discharge lamp lighting device, wherein a plurality of high pressure discharge lamps having starting auxiliary conductors having polarities different from each other and being started by receiving a pulse voltage are inserted and connected between the discharge lamps and a power source. A ballast, a pulse generator that is connected to the ballast and that emits positive-level and negative-level pulse voltages for starting when energized, and a controller that sequentially connects the starting auxiliary conductors each time the power is turned on. Prepare

[0008]

In the discharge lamp lighting device of the first aspect, the plurality of high pressure discharge lamps are sequentially turned on each time the power is turned on. In the discharge lamp lighting device according to the second aspect, the plurality of high pressure discharge lamps are selectively turned on. In the discharge lamp lighting device according to the third aspect, the plurality of high pressure discharge lamps are sequentially turned on each time the power is turned on.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below with reference to the drawings. The first embodiment corresponds to the discharge lamp lighting device of claim 1. As shown in FIG. 1, there are two high pressure discharge lamps 2, 3. These high-pressure discharge lamps are connected in parallel to the AC power supply 10, and a ballast 11 is inserted between the connections.

The high-pressure discharge lamp 2 has electrodes 2a and 2b and a proximity conductor 2c having a polarity corresponding to a negative level pulse voltage as a starting auxiliary conductor, and an AC voltage is applied between both electrodes. In this state, a pulse voltage (negative level) is applied between the electrode 2b and the adjacent conductor 2c, so that it starts and lights up.

The high-pressure discharge lamp 3 has electrodes 3a and 3b, and a proximity conductor 3c having a polarity corresponding to a positive level pulse voltage as a starting auxiliary conductor, and an AC voltage is applied between both electrodes. In this state, when a pulse voltage (positive level) is applied between the electrode 3a and the adjacent conductor 3c, the electrode 3a starts and lights up.

A current transformer 1 is provided in the energizing path to the high pressure discharge lamp 2.
2 is inserted and connected, and the current transformer 13 is inserted and connected to the energization path to the high pressure discharge lamp 3. These current transformers 12 and 13 are
It functions as a means for detecting the lighting state of the high pressure discharge lamps 2, 3.

The ballast 11 has an intermediate tap, and the intermediate tap and the output switch 17 of the control circuit 16 described later.
The pulse generator 14 is connected to the power supply 10 via a.
Similarly, the pulse generator 15 is connected to the power supply 10 via an intermediate tap and an output switch 17b of the control circuit 16 described later.
Are connected.

The pulse generator 14 emits a positive level (+) pulse voltage for starting when energized. The pulse generator 15 emits a negative level (-) pulse voltage for starting when energized. A control circuit 16 is connected to the power supply 10, and the outputs of the current transformers 12 and 13 are supplied to the control circuit 16. The control circuit 16 uses the normally open contact of the relay as the output switch 17a and the normally closed contact of the same relay as the output switch 17b.

Further, the control circuit 16 includes the current transformer 1
Functional means for storing the lighting states of the high pressure discharge lamps 2 and 3 based on the outputs of 2 and 13 regardless of whether the power source 10 is shut off,
By turning on / off the output switches 17a and 17b according to the stored contents, the pulse generators 14 and 15 are alternately operated every time the power source 10 is turned on, whereby the polarity of the pulse voltage is switched every time the power source 10 is turned on. And functional means. The operation will be described.

When the power source 10 is turned on, an AC voltage is applied to the high pressure discharge lamps 2 and 3 via the ballast 11. At this time, if the output switch 17b is turned on, the pulse generator 1
4 operates, and a positive-level pulse voltage is emitted from it.

The positive level pulse voltage is superimposed on the positive half cycle waveform of the AC voltage and applied between the electrode 3a of the high pressure discharge lamp 3 and the adjacent conductor 3c. As a result, the high pressure discharge lamp 3 starts and lights up.

When the high pressure discharge lamp 3 is turned on, a voltage is generated on the secondary side of the current transformer 13, and the voltage is supplied to the control circuit 16. The control circuit 16 stores that the high pressure discharge lamp 3 is in a lighting state based on the input from the current transformer 13. After that, when the power supply 10 is cut off, the high pressure discharge lamp 3 is turned off. At this time, the stored contents of the control circuit 16 are retained as they are without being erased.

Next, when the power source 10 is turned on, the control circuit 16 determines from the stored contents that the previous lighting was the high pressure discharge lamp 3, and the output switch 17a is turned on based on the determination (output). The switch 17b is turned off). When the output switch 17a is turned on, the pulse generator 15 operates,
From there, a negative level pulse voltage is emitted.

The negative level pulse voltage is superimposed on the negative half cycle waveform of the AC voltage and applied between the electrode 2b of the high pressure discharge lamp 2 and the adjacent conductor 2c. As a result, the high pressure discharge lamp 2 starts and lights up.

When the high pressure discharge lamp 2 is turned on, a voltage is generated on the secondary side of the current transformer 12, and the voltage is supplied to the control circuit 16. The control circuit 16 stores that the high pressure discharge lamp 2 is in a lighting state based on the input from the current transformer 12.

By alternately lighting the two high-pressure discharge lamps 2 and 3 in this manner, the life of the high-pressure discharge lamps 2 and 3 can be doubled as compared with the conventional use period, and the labor required for maintenance is greatly reduced. It Next, a second embodiment of the present invention is shown in FIG. The second embodiment corresponds to the discharge lamp lighting device of claim 1.

Here, the pulse generator 30 is connected to the power source 10 via the ballast 11. This pulse generator 30
Emits a positive level or negative level pulse voltage for starting when energized. Which polarity of the pulse voltage is emitted follows the command of the control circuit 16.

The control circuit 16 stores a function means for storing the polarity of the previous pulse voltage generated from the pulse generator 30 regardless of whether the power source 10 is shut off, and an instruction to the pulse generator 30 based on the stored contents. And its pulse generator 30
And a functional means for selecting the polarity of the pulse voltage emitted from the device to a state different from the previous one. 1st about other composition
Same as the embodiment. The operation will be described.

When the power supply 10 is turned on, an AC voltage is applied to the high pressure discharge lamps 2 and 3 via the ballast 11. At this time, if a positive level pulse voltage is generated from the pulse generator 30, the high pressure discharge lamp 3 is started and lit.

When the power source 10 is cut off and then turned on again, a pulse voltage of a negative level is emitted from the pulse generator 30 this time. As a result, the high pressure discharge lamp 2 starts and lights up.

By alternately lighting the two high-pressure discharge lamps 2 and 3 in this way, the life of the high-pressure discharge lamps 2 and 3 can be doubled as compared with the conventional period of use, and the labor required for maintenance is greatly reduced. It A third embodiment of the present invention is shown in FIG. The third embodiment corresponds to the discharge lamp lighting device of claim 2.

Here, a relay 20 is provided in place of the control circuit 16 of the first embodiment, and the normally open contact 20 of the relay 20 is provided.
a and the normally closed contact 20b are output switches 17a and 17b.
Is provided instead of. Then, the manual operation switch 21 is inserted into the energization path of the relay 20. The operation will be described.

When the power supply 10 is turned on, an AC voltage is applied to the high pressure discharge lamps 2 and 3 via the ballast 11. At this time, if the switch 21 is turned off, the pulse generator 1
4 operates to generate a positive level pulse voltage. As a result, the high pressure discharge lamp 3 starts and lights up.

If the switch 21 is turned on when the power source 10 is once shut off and then turned on again, the pulse generator 15 operates to generate a negative level pulse voltage. As a result, the high pressure discharge lamp 2 starts and lights up.

Since the two high pressure discharge lamps 2 and 3 can be manually turned on in this way, the life of the high pressure discharge lamps 2 and 3 can be doubled as compared with the conventional usage period, and the labor required for maintenance is greatly increased. Will be reduced. A fourth embodiment of the present invention is shown in FIG. The fourth embodiment corresponds to the discharge lamp lighting device according to the third aspect.

Here, a pulse generator 30 having a structure for sequentially generating positive and negative level pulse voltages when energized is employed, and the control circuit 16 has output switches 31a (normally open contacts of relay) and 31b (normally relay. Closed contact) is provided. The output switch 31a is inserted in the conduction path of the adjacent conductor 2c, and the output switch 31b is inserted in the conduction path of the adjacent conductor 3c.

The control circuit 16 includes output switches 31a, 3
There is provided functional means for alternately turning on and off 1b to electrically connect the adjacent conductors 2c and 3c each time the power source 10 is turned on. The operation will be described.

When the power supply 10 is turned on, an AC voltage is applied to the high pressure discharge lamps 2 and 3 via the ballast 11. At the same time, the pulse generator 30 sequentially outputs positive-level and negative-level pulse voltages. At this time, if the output switch 31b is turned on, the proximity conductor 3c becomes conductive, the negative-level pulse voltage becomes effective, and the high-pressure discharge lamp 3 starts and lights up.

When the power source 10 is cut off and then turned on again, the output switch 31a is turned on this time. As a result, the proximity conductor 2c becomes conductive, the positive-level pulse voltage becomes effective, and the high-pressure discharge lamp 2 starts and lights up.

By alternately lighting the two high-pressure discharge lamps 2 and 3 in this manner, the life of the high-pressure discharge lamps 2 and 3 can be doubled as compared with the conventional usage period, and the labor required for maintenance is greatly reduced. It

[0037]

As described above, according to the present invention,

Since the discharge lamp lighting device according to any one of claims 1 to 3 is configured to sequentially or selectively light a plurality of high pressure discharge lamps, it is possible to extend the life of the high pressure discharge lamp and replace it. It is possible to reduce the labor required for maintenance such as.

[Brief description of drawings]

FIG. 1 is a diagram showing the configuration of a first embodiment of the present invention.

FIG. 2 is a diagram showing the configuration of a second embodiment of the present invention.

FIG. 3 is a diagram showing the configuration of a third embodiment of the present invention.

FIG. 4 is a diagram showing the configuration of a fourth embodiment of the present invention.

[Explanation of symbols]

2 ... High-pressure discharge lamp, 3 ... High-pressure discharge lamp, 10 ... AC power supply, 1
1 ... Ballast, 12, 13 ... Output transformer, 14, 15 ...
Pulse generator, 16 ... Control circuit.

Claims (3)

[Claims] 1. A plurality of high-pressure discharge lamps having starting auxiliary conductors having polarities different from each other and started by receiving a pulse voltage, a ballast inserted and connected between a connection between these discharge lamps and a power source, and this ballast. And pulse control means for emitting a positive level or negative level pulse voltage for starting when energized, and a control means for switching the polarity of the pulse voltage generated by the pulse generation means each time the power is turned on. Characteristic discharge lamp lighting device. 2. A plurality of high-pressure discharge lamps having starting auxiliary conductors having polarities different from each other and started by receiving a pulse voltage, a ballast inserted between the discharge lamps and a power source, and the ballast. Discharge lamp lighting characterized by comprising pulse generating means connected to the terminal for emitting a positive or negative level pulse voltage for starting when energized, and means for selecting the polarity of the pulse voltage emitted from the pulse generating means. apparatus. 3. A plurality of high-pressure discharge lamps having starting auxiliary conductors of different polarities and starting by receiving a pulse voltage, a ballast inserted and connected between a connection between these discharge lamps and a power supply, and this ballast. And a pulse generating means for emitting a pulse voltage of a positive level and a negative level for starting when energized, and a control means for sequentially connecting the starting auxiliary conductors each time the power is turned on. Electric lighting device.