JPH07272868A - Discharge lamp lighting device, disaster-preventive discharge lamp lighting device, illumination device, and disaster-preventive illumination device - Google Patents

Abstract

PURPOSE:To sense that a discharge lamp comes in its final period of lifetime by sensing the lamp currents using sensors, checking if the sensed voltage is below the specified value, taking the logical sum of them, and thereupon judging if the discharge lamp operates normally or in failure. CONSTITUTION:In case a normally used power supply 1 operates as specified, a changeover device 11 changes over from a sensing device 2 to an emergency lighting device 6 when lighting device is turned on by putting on the power supply 1, and a discharge lamp 3 is lighted with a relatively reduced power of an emergency power supply 4. The automatic inspection of the discharge lamp 3 is performed so that the lamp current and voltage are sensed by a current sensing device 7 and a voltage sensing device 8, respectively, when the emergency lighted condition is generated by an inspection switch etc., and a sensing device 9 judges the operating condition of the lamp 3 on the basis of the logical sum of the obtained values. The normal condition to be judged is such that at least the device 7 senses a lamp current and the device 8 senses a lamp voltage below the specified value, and any other case should be judged as failure.

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, a discharge lamp lighting device for disaster prevention, an illuminating device and a disaster prevention lighting device capable of inspecting whether a discharge lamp is normal or abnormal.

[0002]

2. Description of the Related Art If a discharge lamp such as a fluorescent lamp is suddenly turned off, it is inconvenient for the user.
It is confusing. Particularly, in a disaster prevention lighting device such as a guide light, the fact that the discharge lamp is not turned on when necessary causes a serious problem. For this reason, Japanese Patent Publication No. 55-30680 discloses a disaster prevention lighting device that automatically checks whether or not a discharge lamp is turned on. This is intended to check the lighting state of the discharge lamp by detecting the luminous flux or lamp current of the discharge lamp.

[0003]

DISCLOSURE OF INVENTION Problems to be Solved by the Invention When a discharge lamp approaches the end of its life, it apparently lights normally. That is, a light flux that is steady or near steady is output, and the lamp current also flows at or near steady. Therefore, in the above-mentioned conventional lamp, it is considered that even such a discharge lamp is regarded as normal lighting. However, it is clear that such a discharge lamp will eventually reach the end of its life and cannot be lit. In a disaster prevention lighting device, it is fatal that the discharge lamp does not turn on in an emergency, and even if automatic inspection is performed, a sufficient effect cannot be obtained.

The present invention has been made in order to solve such a conventional problem. By detecting the state of the discharge lamp more surely, normality and abnormality of the discharge lamp in the life or the end of life can be detected. An object of the present invention is to provide a discharge lamp lighting device for disaster prevention lighting and a possible disaster prevention lighting device.

[0005]

According to a first aspect of the present invention, there is provided a discharge lamp, a lighting device for stably lighting the discharge lamp, a current detection device for detecting a lamp current of the discharge lamp, and a discharge lamp. The voltage detection device that detects the voltage corresponding to the lamp voltage of the electric lamp, the current detection device detects the lamp current, and the logical sum of the detection voltage of the voltage detection device is less than a predetermined value The discharge lamp lighting device is provided with a detecting means for detecting an abnormality.

In the present invention, the lighting device may be either a low frequency output device composed of an impedance device such as an inductor or a high frequency output device such as an inverter. In the case of a high-frequency output, a one-stone type or a two-stone type inverter can be appropriately used (the same applies to the following inventions).

According to the second aspect of the present invention, a regular power source, a discharge lamp energized by the regular power source, and a lighting device interposed between the regular power source and the discharge lamp for stably lighting the discharge lamp, An emergency power supply and an emergency lighting device that operates by being powered by the emergency power supply in the emergency of the regular power supply and lighting the discharge lamp,
A current detection device that detects the lamp current of the discharge lamp during lighting by the emergency lighting device, a voltage detection device that detects a voltage corresponding to the lamp voltage of the discharge lamp during lighting by the emergency lighting device, and a current detection device. The discharge lamp lighting device for disaster prevention is provided with a detection means for detecting whether the discharge lamp is normal or abnormal by taking a logical sum of the fact that the lamp current is detected and the detection voltage of the voltage detection device is below a predetermined value.

The invention described in claim 3 is an illuminating device comprising the illuminating device main body and the lighting device according to claim 1 provided in the illuminating device main body.

A fourth aspect of the present invention is a disaster prevention lighting device comprising a lighting device main body and the disaster prevention discharge lamp lighting device according to the second aspect provided in the lighting device main body.

[0010]

The invention according to claim 1 utilizes that the lamp voltage rises when the discharge lamp reaches the end of life,
Normality and abnormality of the discharge lamp are detected under the condition that the voltage according to the lamp voltage and the lamp current are within predetermined ranges. Therefore, it is possible to reliably detect the discharge lamp in the end of life state and replace it in advance, even if the discharge lamp is apparently normally lit.

According to the second aspect of the invention, at the time of inspection, the lighting is switched to the emergency lighting device. As a result, the normality or abnormality of the discharge lamp is detected as in the case of the first aspect of the invention. Therefore, the inspection can be performed under the same conditions as the actual emergency, including the state of the emergency power supply.

The invention described in claim 3 has basically the same operation as the invention described in claim 1.

The invention described in claim 4 has basically the same operation as the invention described in claim 2.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIG. Reference numeral 1 denotes a regular power source such as a commercial AC power source, and a discharge lamp 3 such as a fluorescent lamp is energized from the regular power source 1 via a lighting device 2. Four
Is an emergency power source, for example, a battery, and is constantly charged from the regular power source 1 through the charging device 5. Reference numeral 6 denotes an emergency lighting device, which is operated by being supplied with power from the emergency power source 4 in an emergency, and lights the discharge lamp 3 in place of the lighting device 2. Generally, a high frequency generator including an inverter is used.

Reference numeral 7 denotes a current detecting device, which is the discharge lamp 3
Detects the lamp current of. Reference numeral 8 is a voltage detection device that detects a voltage corresponding to the lamp voltage of the discharge lamp 3. Detecting the voltage corresponding to the lamp voltage means that the lamp voltage may be directly detected or the voltage at a portion having a predetermined relationship with the lamp voltage may be detected. 9
Is a detection means for detecting the normality or abnormality of the discharge lamp by taking the logical sum of the detection values of the current detection device 7 and the voltage detection device 8. The content of the logical sum is that at least the current detection device 7 detects the lamp current, and the voltage detection device 8
The discharge lamp is judged to be normal on the condition that the lamp voltage (excluding zero) is less than the predetermined value is detected, and the others are judged to be abnormal.

Reference numeral 10 is an output means for outputting the detection result of the detection means 9. The detection means 10 may be one that gives a notification by voice, one that visually displays, or a combination thereof. Further, even when a large number of such disaster prevention lighting devices are installed, it may be means for transmitting the detection result to the centralized control room. 11 is a switching device, which is a power failure of the regular power source 1,
The output of the emergency power supply 4 is supplied to the emergency lighting device 6 when an abnormality such as a voltage drop occurs, and the discharge lamp 3 is switched from the lighting device 2 to the emergency lighting device. Such a switching device 11 is well known, and those skilled in the art can appropriately configure a relay-based device, a semiconductor switching device-based device, or the like. 12
Is an inspection switch.

Next, the operation of this embodiment will be described. When the service power supply 1 is normal, the lighting device 2 lights the discharge lamp 3 when the service power supply 1 is turned on. When the utility power supply 1 goes into an abnormal state such as a drop, the switching device 11 detects this and
The connection of the discharge lamp 3 is switched from the lighting device 2 to the emergency lighting device 6 by switching means such as a relay contact. Also, the output of the emergency power supply is supplied to the emergency lighting device. This allows
The discharge lamp 3 is lit with relatively reduced power. For example, the light is turned on so that the light output is 36% of that during normal lighting. Such an action is the same as the conventional one.

On the other hand, when the discharge lamp is automatically inspected, it is brought into the emergency lighting state by the inspection switch 12 or by means (not shown) such as cutting off the regular power source 1. The lamp current at this time is detected by the current detecting means 7, and the voltage corresponding to the lamp voltage is detected by the voltage detecting means 8.
Then, the state of the discharge lamp is determined by the detecting means 9 based on these detection results. The judgment conditions are as described above. Then, this determination result is output by the output means 10.

Next, another embodiment of the present invention will be described with reference to FIG. FIG. 2 shows only essential parts and omits others, and parts which are the same as or correspond to those in FIG. The current detection device 7 of this embodiment is the current transformer 7
1, a rectifier 72, a light receiving element 7 that constitutes a photocoupler
3. A light emitting element 74 which also constitutes a photocoupler is mainly constituted.

The voltage detection device 8 detects a part of the output voltage of the emergency lighting device to detect a voltage corresponding to the lamp voltage. And rectifier 8
1. Constant voltage element 82, transistor 83 whose conduction is controlled by this constant voltage element 82, transistor 84 whose conduction is controlled by this transistor 83, and this transistor 84
And a light emitting element 85 which is provided in series with the light receiving element 73 and constitutes a photocoupler. The output device 10 includes the light emitting element 74 and a light receiving element which constitutes a photo coupler.

The operation of this embodiment will be described. If the discharge lamp 3 is normally turned on, the constant voltage element 82 of the voltage detection device 8 is turned off, the transistor 83 is turned off, and the transistor 84 is turned on. Therefore, the light emitting element 85 inputs a signal to the light receiving element 73. If the lamp current is flowing in this state, the light emitting element 74 is turned on, and the light receiving element of the output device 10 is turned on. Here, when the discharge lamp 3 is in the end of life state, the lamp voltage is rising. Therefore, the detection voltage of the voltage detection device 8 is relatively large, and the constant voltage element 8
2 turns on. Therefore, since the transistor 84 is turned off and the light emitting element 85 is also turned off, the light emitting element of the output device 10 is not turned on even when the lamp current flows. Therefore, it is possible to detect whether the discharge lamp 3 is normal or abnormal, including the end-of-life state.

Although the discharge lamp lighting device for disaster prevention has been described above, in the case of a general discharge lamp lighting device, the emergency power source 4, the charging device 5, and the emergency lighting device 6 are shown in FIG.
The current detection device 7 and the voltage detection device 8 may be provided on the output side of the lighting device 2 except for the switching device 11. Further, in FIG. 2, the emergency lighting device 6 may be replaced with a lighting device.

Next, an embodiment of the illuminating device will be described with reference to FIG. Reference numeral 31 is a main body of the illuminating device, which is, for example, of a type directly attached to the ceiling. Reference numeral 32 is a discharge lamp provided in the main body 31. The discharge lamp lighting device 33 as described above is arranged in the main body 31.

Next, an embodiment of the disaster prevention lighting device will be described with reference to FIG. Reference numeral 41 denotes a lighting device main body, for example, an induction light main body. Reference numeral 42 is a guide display plate provided on the main body 41. The discharge lamp lighting device for disaster prevention lighting as described above is disposed in the main body 41. That is, the discharge lamp is arranged so as to face the display plate 42, and each part of the disaster prevention discharge lamp lighting device is arranged in the frame portion 43 of the main body 41. Incidentally, 44 is an operation tool of the inspection switch.

The present invention allows various modifications other than the above embodiment. For example, disaster prevention lighting equipment
It may be an emergency light instead of an induction light.

[0026]

As described above, the invention according to claim 1 determines whether the discharge lamp is normal or abnormal based on the presence or absence of the lamp current and whether or not the lamp voltage value is lower than a predetermined value. Therefore, the end-of-life state in which the discharge lamp is apparently lit can be detected, and the inspection can be performed accurately.

The invention described in claim 2 can provide a discharge lamp lighting device for disaster prevention having the same effect as that of the invention described in claim 1.

The invention described in claim 3 can provide an illuminating device having the same effect as the invention described in claim 1.

The invention as set forth in claim 4 can provide a disaster prevention lighting device having the same effect as that of the invention as set forth in claim 2.

[Brief description of drawings]

FIG. 1 is a circuit diagram showing an embodiment of the present invention.

FIG. 2 is a circuit diagram showing another embodiment of the present invention.

FIG. 3 is a plan view showing in simplified form one embodiment of a lighting device of the present invention.

FIG. 4 is a perspective view showing a simplified example of the disaster prevention lighting device of the present invention.

[Explanation of symbols]

1 ... Permanent power supply, 2 ... Lighting device, 3 ... Discharge lamp, 4 ... Emergency power supply, 6 ... Emergency lighting device, 7 ... Current detection device,
8 ... Voltage detection device, 10 ... Detection device, 31, 41 ... Lighting device main body.

Claims (4)

[Claims] 1. A discharge lamp; a lighting device for stably lighting the discharge lamp; a current detection device for detecting a lamp current of the discharge lamp; a voltage detection for detecting a voltage corresponding to a lamp voltage of the discharge lamp. A device; and a detection means for detecting whether the discharge lamp is normal or abnormal by taking the logical sum of the fact that the current detection device has detected the lamp current and that the detection voltage of the voltage detection device is below a predetermined value. Discharge lamp lighting device characterized by. 2. A regular power source; a discharge lamp energized by the regular power source; a lighting device interposed between the regular power source and the discharge lamp for stably lighting the discharge lamp; an emergency power source; a regular power source. Emergency lighting device that is powered by an emergency power supply to operate the discharge lamp in an emergency; a current detection device that detects the lamp current of the discharge lamp during lighting by the emergency lighting device; lighting by the emergency lighting device A voltage detecting device for detecting a voltage corresponding to the lamp voltage of the discharge lamp at the time; and a logical sum of the fact that the current detecting device detects the lamp current and the detected voltage of the voltage detecting device is less than or equal to a predetermined value. A discharge lamp lighting device for disaster prevention, comprising: a detection unit that detects whether the electric lamp is normal or abnormal. 3. A lighting device comprising: a lighting device main body; and the discharge lamp lighting device according to claim 1 provided in the lighting device main body. 4. A disaster prevention lighting device comprising: a lighting device main body; and the discharge lamp lighting device for disaster prevention lighting according to claim 2, which is provided in the lighting device main body.