JPH08102375A - Discharge lamp lighting device, lighting device for discharge lamp, and lighting system - Google Patents

Abstract

PURPOSE: To make possible preventing thermal damage to electronic parts by providing a second thermal protector which cuts off currents to the electronic parts and is mounted in a position in which it can detect the heating of the electronic parts. CONSTITUTION: A second thermal protector 12 such as a thermal fuse is mounted inside a case 4 near a pulse generating circuit 9 to detect abnormal rises in temperature of electronic parts constituting the circuit 9. The protector 12 is inserted in series between one of the extension lines 8 of the coil of a ballast main body 1 and a commercial AC power supply. The protector cuts off power on detecting abnormal rises in temperature of the electronic parts constituting the circuit 9, thereby cutting off currents to the electronic parts. Even if the temperature inside the case 4 is raised excessively by the influence of direct sunlight before the temperature of the coil 3 of the ballast rises, the protector 12 detects this temperature rise and can protect the electronic parts, so that thermal damage to the electronic parts can also be prevented.

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 having a heat protection function using a thermal protector, a discharge lamp lighting device and a lighting device.

[0002]

2. Description of the Related Art In a conventional lighting device for a discharge lamp of this type, as shown in, for example, Japanese Utility Model Publication No. Sho 49-11725, a ballast body is housed in a case, and the ballast is filled in the case. A ballast is used to surround the ballast body with a compound, and a thermal fuse is installed in the space formed in this case.
When the abnormal current flows through the coil of the ballast body due to abnormal rise of power supply voltage or deterioration of insulation resistance at the end of life, and the temperature of the coil rises, the thermal fuse operates to cut off the power supply to the coil. Was taken.

[0003]

However, even if the temperature inside the case rises abnormally due to direct sunlight, for example, on the case housing the ballast, the coil temperature rises slowly with a delay. Therefore, the above-described conventional lighting device for a discharge lamp, which uses the temperature fuse that operates by the temperature rise of the coil of the ballast, cannot quickly detect this abnormal temperature rise. Then, if the discharge lamp lighting device is operated while such a temperature is rising, there is a problem that, for example, electronic components constituting the pulse generating circuit or the like are damaged.

The present invention has been made to solve the above problems, and an object of the present invention is to provide a discharge lamp lighting device, a discharge lamp lighting device, and a lighting device which can prevent thermal damage to electronic components. .

[0005]

According to another aspect of the present invention, there is provided a discharge lamp lighting device including a discharge lamp, an iron core and a coil mounted on the iron core, and a ballast body for urging the discharge lamp, and a ballast. A first thermal protector attached to a coil of the main body to cut off the energization of the coil, an electronic component electrically connected to the ballast body, a case for housing the ballast body and the electronic component, and an electronic component A second thermal protector is provided at a position where heat generation can be detected, and the second thermal protector is provided for cutting off the power supply to the electronic component.

A discharge lamp lighting device according to a second aspect of the present invention includes a ballast main body having a discharge lamp, an iron core and a coil attached to the iron core, which is connected in series to the discharge lamp, and a coil of the ballast main body. First attached to cut off power to the coil
Connected in parallel with the thermal protector and the discharge lamp,
A pulse starting circuit having electronic parts, a case accommodating the ballast main body and the pulse starting circuit, and a second thermal protector arranged at a position where heat generation of the electronic parts can be detected and for interrupting energization to the electronic parts. , Are provided.

According to a third aspect of the present invention, there is provided a lighting device for a discharge lamp, wherein a ballast main body having an iron core and a coil mounted on the iron core, and a first ballast attached to the coil of the ballast main body to cut off the power supply to the coil. The thermal protector, the electronic components electrically connected to the ballast body, the case that houses the ballast body and the electronic components, and the position where the heat generation of the electronic components can be detected, and the electronic components are energized And a second thermal protector for shutting off.

A discharge lamp lighting device according to a fourth aspect of the present invention is a ballast main body having an iron core and a coil attached to the iron core, and a first ballast attached to the coil of the ballast main body to cut off the energization to the coil. A thermal protector, a pulse starting circuit having electronic parts, a case for accommodating the ballast body and the pulse starting circuit, and a position at which heat generation of the electronic parts can be detected and which cuts off power to the electronic parts. It is characterized by including two thermal protectors.

According to a fifth aspect of the present invention, in the discharge lamp lighting device according to the third or fourth aspect, the operating temperature at which the first thermal protector is de-energized is the operating temperature at which the second thermal protector is de-energized. It is characterized by being configured higher than.

An illumination device according to a sixth aspect of the present invention is the illumination device according to the third to fifth aspects.
The discharge lamp lighting device according to any one of claims 1 to 3, a discharge lamp that is energized by the discharge lamp lighting device, and a lighting fixture body that houses the discharge lamp lighting device and the discharge lamp. And

[0011]

According to the above construction, the first thermal protector attached to the coil of the ballast main body operates when the coil abnormally heats up to cut off the power supply to the coil. Also,
The second thermal protector operates when the temperature of the electronic component rises abnormally to cut off the power supply to the electronic component. Therefore, it is possible to prevent thermal damage to the electronic component.

According to the invention of claim 5, the first
The operating temperature that shuts off the power to the thermal protector is the second
Since it is configured to have an operating temperature higher than the temperature at which the thermal protector is cut off, it has the effect of preferentially protecting electronic components that are susceptible to thermal degradation.

An illumination device according to a sixth aspect of the invention has the same function as the ballast for discharge lamps.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A configuration of an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a sectional view of an embodiment of a lighting device for a discharge lamp. Reference numeral 1 is a ballast body such as a choke or a magnetic leakage transformer, which comprises an iron core 2 and a coil 3 mounted on the iron core 2.
The coil 3 is mounted on the iron core 2 so that the longitudinal direction is the vertical direction, and the upper and lower portions of the coil 3 are projected from the upper and lower surfaces of the iron core 2, respectively.

Reference numeral 4 denotes a vertically elongated case in which the ballast main body 1 is housed with the coil 3 aligned with the longitudinal direction of the case. The compound 5 is placed in the space between the inner surface of the case 4 and the ballast body 1.
And the ballast body 1 is surrounded by a compound 5. A space 6 is formed in the lower portion of the case 4 so as to face the lower side of the coil 3 of the ballast body 1.
Are formed.

Reference numeral 7 denotes a first thermal protector such as a thermal fuse, which is attached in proximity to the portion of the coil 3 of the ballast body 1 projecting downward from the iron core 2 and in proximity to the space 6 in the case 4. Are arranged. Then, the first thermal protector 7 detects an abnormal temperature rise of the coil 3 of the ballast main body 1 and shuts off the current flowing through the coil 3.

Further, one lead wire 8 of the coil of the ballast main body 1 is wired in the space 6 of the case 4 and then connected to a pulse generating circuit 9 composed of electronic parts such as thyristors and transistors. Then, it is led out from the outlet 10 below the case 4. Mounting legs 11 are attached to the upper and lower portions of the back surface of the case 4, respectively.

Further, in a case 4 inside the case 4 in the vicinity of the pulse generating circuit 9 provided for generating a high voltage pulse for a predetermined period immediately after the power is turned on and causing dielectric breakdown of the discharge medium enclosed in the discharge lamp. A second thermal protector 12, such as a temperature fuse, is provided to detect an abnormal temperature rise of the electronic components forming the pulse generation circuit 9. The second thermal protector 12 is inserted in series between the other lead wire 8 of the coil of the ballast main body 1 and the commercial AC power supply, and therefore, the abnormal temperature of the electronic components forming the pulse generating circuit 9 is abnormal. By detecting the rise and cutting off the power supply, the power supply to the electronic parts is cut off.

FIG. 2 shows the circuit block of the discharge lamp lighting device and the discharge lamp lighting device connected to the discharge lamp. In FIG. 2, the discharge lamp 13 is a high-intensity discharge lamp such as a high-pressure mercury lamp, a high-pressure sodium lamp, and a metal halide lamp, but may be another low-pressure metal vapor discharge lamp.

Further, FIG. 3 shows the construction of an illuminating device using the above-mentioned discharge lamp lighting device. In FIG. 3, the luminaire main body 14 accommodates the discharge lamp 13 and the discharge lamp lighting device, and is suitable for, for example, a street light.

Next, the operation of the above embodiment will be described.

The temperature of the coil 3 of the ballast body 1 is raised by energization, but in a normal state, the winding temperature of the coil 3 is, for example, about 105 ° C., and the first thermal protector 7 is not operated. The current continuously flows through the coil 3. When an abnormal current flows through the coil 3 due to an abnormal rise in the power supply voltage or deterioration of the insulation resistance at the end of the life of the ballast main body 1, the winding temperature of the coil 3 rises, and the space 6 of the case 4 is filled with the coil. 3, the space 6 is higher than the outside air by about 10 ° C. because hot air radiated from the coil 3 is contained therein. Then, the temperature of the lower side of the coil 3 attached with the first thermal protector 7 is higher than that of the upper side of the coil 3, and the first thermal protector 7 has, for example, 12
When the temperature rises above 0 ° C., the abnormal temperature rise of the coil 3 is detected and the coil 3 is activated to cut off the power supply to the coil 3.

Further, the second thermal protector 12 may cause an abnormal temperature rise of the electronic component when the temperature of the electronic component is excessively increased or the temperature rises excessively due to the influence of direct sunlight or the abnormal operation of the electronic component. When it detects and operates, it shuts off the power supply and stops energizing the electronic components.

In the above embodiment, the first and second
Although a thermal protector using a temperature fuse is described, a temperature detecting element such as a thermistor may be used.

[0026]

As described above, according to the present invention, even when the temperature inside the case excessively rises due to the influence of direct sunlight or the like before the temperature of the coil of the ballast rises, Since the thermal protector can detect this temperature rise and protect the electronic components, it is possible to provide a discharge lamp lighting device, a discharge lamp lighting device, and a lighting device that can prevent thermal damage to the electronic components.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a lighting device for a discharge lamp according to an embodiment of the present invention.

FIG. 2 is a circuit configuration diagram of a discharge lamp lighting device and a discharge lamp lighting device of the present invention.

FIG. 3 is an external view showing an embodiment of a lighting device of the present invention.

[Explanation of symbols]

1 ... Ballast main body 2 ... Iron core 3 ... Coil 4 ...
Case, 7 ... First thermal protector, 9 ... Pulse generation circuit (electronic component), 12 ... Second thermal protector, 13 ... Discharge lamp, 14 ... Lighting fixture body

Claims (6)

[Claims] 1. A discharge lamp; a ballast main body having an iron core and a coil attached to the iron core for urging the discharge lamp; a ballast attached to a coil of the ballast main body for interrupting energization to the coil; 1 thermal protector; electronic parts electrically connected to the ballast body; case for housing the ballast body and electronic parts; disposed at a position where heat generation of the electronic parts can be detected, A discharge lamp lighting device, comprising: a second thermal protector for cutting off electricity. 2. A ballast main body having a discharge lamp; an iron core and a coil attached to the iron core, which is connected in series to the discharge lamp; and a coil attached to the ballast main body for energizing the coil. A first thermal protector for shutting off; a pulse starting circuit connected in parallel to a discharge lamp and having electronic parts; a case accommodating a ballast body and a pulse starting circuit; at a position where heat generation of electronic parts can be detected A discharge lamp lighting device, comprising: a second thermal protector, which is disposed and cuts off electric power to electronic parts. 3. A ballast main body having an iron core and a coil attached to the iron core; a first thermal protector attached to the coil of the ballast main body to cut off the power supply to the coil; An electrically connected electronic component; a case for accommodating the ballast main body and the electronic component; a second thermal protector arranged at a position where heat generation of the electronic component can be detected and for interrupting energization to the electronic component A lighting device for a discharge lamp, comprising: 4. A ballast main body having an iron core and a coil attached to the iron core; a first thermal protector attached to the coil of the ballast main body to cut off the power supply to the coil; and electronic parts. A pulse starting circuit; a case for accommodating the ballast main body and the pulse starting circuit; and a second thermal protector arranged at a position where heat generation of the electronic component can be detected and for interrupting energization to the electronic component. A lighting device for a discharge lamp, which is characterized in that 5. The operating temperature for shutting off the energization of the first thermal protector is set higher than the operating temperature for shutting off the energization of the second thermal protector. Lighting device for discharge lamps. 6. A lighting device for a discharge lamp according to any one of claims 3 to 5; a discharge lamp which is energized by the lighting device for a discharge lamp; and a lighting fixture for housing the lighting device for a discharge lamp and the discharge lamp. A lighting device comprising: a main body;