JP5671282B2 - Deterioration detection method and detection apparatus for low-pressure discharge lamp, and lighting fixture - Google Patents

Description

  The present invention relates to a detection method and a detection device for detecting the degree of deterioration of a low-pressure discharge lamp such as a fluorescent lamp, and a lighting fixture equipped with the detection device.

  A fluorescent lamp, which is one type of low-pressure discharge lamp, will eventually stop emitting light when the thermoelectron emitting material (emitter) applied to the filament is reduced (consumed). Therefore, in the past, it was determined that the fluorescent lamp had reached the end of its life by detecting that the emitter of one of the two filaments was consumed and became a half-wave discharge state (emitterless state) ( For example, see Patent Document 1).

JP 11-31594 A

  However, in the conventional detection method as described above, the fluorescent lamp has already reached the end of life when one of the filaments is in the emitterless state (half-wave discharge state), and the fluorescence until the end of the life is reached. There was a problem that the degree of deterioration of the lamp could not be detected.

  The present invention has been made in view of the above problems, and an object of the present invention is to detect the degree of deterioration until a low-pressure discharge lamp such as a fluorescent lamp reaches the end of its life.

Deterioration degree detecting method for low-pressure discharge lamp of the present invention is a detection method for detecting the degree of deterioration of low圧放lamp, detects the lamp current flowing at the time of steady lighting of the low-pressure discharge lamp, the cathode of the lamp current comparing the detected value during the period of the detected value and the negative of the period of sexual, the low pressure based on a difference between the detected value of the detection value and the negative polarity period of the positive polarity period of the lamp current It is characterized by determining the degree of deterioration of the discharge lamp.

In this deterioration degree detection method, the detected value of the lamp current is time-differentiated, and the difference between the time-differentiated value of the detected value in the positive polarity period of the lamp current and the time-differentiated value of the detected value in the negative period. It is preferable to determine the degree of deterioration of the low-pressure discharge lamp.

Deterioration degree detecting apparatus of the low-pressure discharge lamp of the present invention is a detection device for detecting the degree of deterioration of low圧放lamp, a current detecting means for detecting a lamp current flowing in the rated operation of the low-pressure discharge lamp, the lamp comparing the detected value during the period of the detected value and the negative in the positive polarity period of the current, based on a difference between the detected value of the detection value and the negative polarity period of the positive polarity period of the lamp current And a judging means for judging the degree of deterioration of the low-pressure discharge lamp.

In this deterioration degree detection device, the determination means time-differentiates the detected value of the lamp current, and the time differential value of the detected value in the positive polarity period of the lamp current and the time of the detected value in the negative polarity period. it is preferable to determine the deterioration degree of the low-pressure discharge lamp from the difference between the differential value.

Lighting apparatus of the present invention is characterized and a fixture main body for holding the low圧放lamp, a ballast for lighting the low-pressure discharge lamp, further comprising a deterioration degree detecting device according to claim 3 or 4.

  The lighting apparatus preferably includes a control device that stops the ballast or reduces the output when the deterioration level detected by the deterioration level detection device exceeds a predetermined upper limit value.

  In this lighting fixture, it is preferable that the lighting device further includes an informing means for informing the degree of deterioration detected by the deterioration degree detecting device.

Deterioration degree detecting method and detecting apparatus, and lighting equipment of the low-pressure discharge lamp of the present invention, there is an effect that it is possible to detect the deterioration degree to a low圧放lamp reaches the end of life.

It is explanatory drawing for demonstrating the deterioration degree detection method of the fluorescent lamp which concerns on this invention. It is a block diagram of the experimental apparatus which the present inventors performed. It is a current-voltage characteristic figure which shows the experimental result same as the above. It is a block diagram of the lighting fixture which mounts the degradation degree detection apparatus of the fluorescent lamp which concerns on this invention, and its detection apparatus.

  Hereinafter, an embodiment in which the technical idea of the present invention is applied to a detection method, a detection device, and a lighting fixture for detecting the degree of deterioration of a fluorescent lamp will be described. However, the low pressure discharge lamp capable of detecting the degree of deterioration by the detection method according to the present invention is not limited to the fluorescent lamp.

  First, the basic principle of the degradation degree detection method according to the present invention will be described. The inventors conducted the following experiment using the experimental apparatus shown in FIG. (1) Fluorescent lamp (high-frequency lighting-only fluorescent lamp: FHF32EX-N) 10 is rated for 30 minutes with fluorescent electronic ballast 11 and is placed in a quasi-steady state before being transferred to one electrode (filament) of fluorescent lamp 10. AC voltage heating is performed by applying a voltage of 70 volts via Slidac 13 through 12. (2) The lamp current flowing through the fluorescent lamp 10 is detected by the current probe 14, the lamp voltage of the fluorescent lamp 10 is detected by the differential probe 15, and the detected lamp current and lamp voltage are captured in the oscilloscope 16 and recorded. (3) The lamp current and lamp voltage recorded by the oscilloscope 16 are analyzed.

  FIG. 3 shows the characteristics of the lamp current and the lamp voltage obtained in the above-described experiment. In FIG. 3, the horizontal axis represents time, and the vertical axis represents lamp current and lamp voltage. Although not clearly shown in FIG. 3, it was found that the current-voltage characteristic is asymmetric when one filament is energized and heated to relatively improve thermionic emission performance. In order to emphasize this asymmetry, a current-voltage characteristic obtained by time-differentiating the lamp current is shown in FIG. A solid line X1 in FIG. 1 indicates a current-voltage characteristic when one of the filaments is energized and heated, and a broken line X2 in FIG. 1 indicates a current-voltage characteristic when none of the filaments is energized and heated. In addition, the filament that is heated and energized corresponds to a filament with a high degree of deterioration (filament with a long service time), and the filament that is not heated and energized corresponds to a filament with a low degree of deterioration (new filament).

  Comparing the two current-voltage characteristics X1 and X2 shown in FIG. 1, the current-voltage characteristic X2 when one of the filaments is not energized and heated is before and after the lamp current reverses polarity, for example, the lamp voltage is plus 90 volts. And the lamp current at minus 90 volts is almost equal. On the other hand, the current-voltage characteristic X1 when one filament is energized and heated has a difference in lamp current before and after the polarity of the lamp current is reversed, for example, when the lamp voltage is plus 90 volts and minus 90 volts. . This is presumably because thermionic emission from the hot spot generated at the emitter of the filament becomes asymmetric when the fluorescent lamp deteriorates, and an asymmetric portion appears in the lamp current waveform. This asymmetry becomes particularly noticeable with the deterioration of fluorescent lamps, especially at the end of life (decrease in emitters), so by observing the lamp current asymmetry (difference) before and after polarity reversal, Can be detected. Here, the degree of deterioration of the fluorescent lamp can be determined from the difference in lamp current before and after the polarity inversion, but as described above, it is easier and more accurate to determine from the time differential value (difference) of the lamp current. Can be judged. Note that “before and after the lamp current reverses polarity” does not mean immediately before and after the lamp current polarity reverses, but as described above, the lamp current flows in the entire positive polarity period and negative polarity. It means the whole period.

  FIG. 4 shows a luminaire equipped with a detection device that realizes the above-described degradation degree detection method. This luminaire includes a pair of lamp sockets 1 and 1, a fluorescent electronic ballast 2 that turns on a fluorescent lamp upon receiving power from a commercial AC power supply AC, and a lamp that detects a lamp current for each filament of the fluorescent lamp. Current detection units 3 and 3, a control unit 4, a notification unit 5, and an instrument body 6 are provided. A base (not shown) of the fluorescent lamp 10 is detachably connected to the pair of lamp sockets 1 and 1. Further, a preheating capacitor 7 is connected to the lamp sockets 1 and 1. However, since the fluorescent lamp electronic ballast 2 and the lamp current detectors 3 and 3 are well known in the art, the detailed circuit configuration is not shown and described. The appliance body 6 is formed in a rectangular plate shape or a box shape by a metal plate or the like, for example, and includes lamp sockets 1, 1, fluorescent lamp electronic ballast 2, lamp current detection units 3, 3, control unit 4, and notification unit. 5 is attached to the ceiling or wall.

  The control unit 4 is composed of, for example, a microcomputer or a memory. Then, the control unit 4 captures the detection values of the lamp current detection units 3 and 3 and stores them in the memory, and obtains the time differential value of the detection values before and after the lamp current reverses in polarity and stores it in the memory. Further, the control unit 4 compares the time differential value (the time differential value of the detected value before and after the lamp current polarity inversion) stored in the memory, and determines the time differential value of the detected value before and after the lamp current polarity inversion. The degree of deterioration of the fluorescent lamp is determined based on the difference. That is, in the present embodiment, the lamp current detection units 3 and 3 and the control unit 4 constitute a fluorescent lamp deterioration degree detection device.

  Thus, as the number of emitters applied to the filament decreases and the degree of deterioration of the fluorescent lamp proceeds, the difference between the time differential values of the detected values before and after the lamp current reverses in polarity increases. Therefore, the control part 4 can judge the deterioration degree of a fluorescent lamp in several steps by comparing the difference of a time differential value with the threshold value set in multiple steps. The notification unit 5 includes, for example, a plurality of light emitting diodes. And this alerting | reporting part 5 alert | reports the deterioration degree of a fluorescent lamp by the number of the light emitting diodes light-emitted simultaneously under control of the control part 4. FIG. For example, as the degree of deterioration progresses, the number of light emitting diodes that simultaneously emit light increases.

  As described above, according to the lighting apparatus of the present embodiment, since the notification unit 5 reports the degree of deterioration of the fluorescent lamp 10, the replacement of the fluorescent lamp 10 can be urged before the half-wave lighting state is achieved. Further, if the control unit 4 stops the fluorescent lamp electronic ballast 2 or reduces the output when the degree of deterioration exceeds a predetermined upper limit value, the fluorescent lamp electronic is turned on when the fluorescent lamp 10 at the end of life is turned on. The burden on the ballast 2 can be reduced. In the present embodiment, the control unit 4 corresponds to a control device.

  Here, in the lighting fixture of this embodiment, the lamp current detection unit 3 is provided for each filament of the fluorescent lamp 10, but the lamp current detection unit 3 may be provided only on one of the filament sides.

DESCRIPTION OF SYMBOLS 1 Lamp socket 2 Fluorescent lamp electronic ballast 3 Lamp current detection part 4 Control part 5 Notification part 6 Instrument body

Claims (7)

The detection process of detecting the degree of deterioration of low圧放lamp, detects the lamp current flowing at the time of steady lighting of the low-pressure discharge lamp, in the detection value and the duration of the negative polarity in the positive polarity period of the lamp current wherein comparing the detected values, characterized by determining the degree of deterioration of the low-pressure discharge lamp based on a difference between the detected value of the detection value and the negative polarity period of the positive polarity period of the lamp current A method for detecting the degree of deterioration of a low-pressure discharge lamp. Degradation of the low-pressure discharge lamp from the difference between the time differential value of the detected value in the positive polarity period of the lamp current and the time differential value of the detected value in the negative polarity period of the lamp current 2. The method of detecting the degree of deterioration of a low-pressure discharge lamp according to claim 1, wherein the degree is determined. A detecting apparatus for detecting a deterioration degree of the low圧放lamp, a current detecting means for detecting a lamp current flowing in the rated operation of the low-pressure discharge lamp, the detection value and the negative polarity in the positive polarity period of the lamp current comparing the detected value during the period, the lamp positive the detected value and the negative determination means for determining the degree of deterioration of the low-pressure discharge lamp based on a difference between the detected value in the period of the period of the current A deterioration degree detecting device for a low-pressure discharge lamp, comprising: The judgment unit, the lamp detection value by differentiating the time of current, the the difference between the time differential value of the detection value in a period of time-differentiated value and the negative of the detected value in the positive polarity period of the lamp current 4. The deterioration degree detecting device for a low pressure discharge lamp according to claim 3, wherein the deterioration degree of the low pressure discharge lamp is determined. Luminaires and a fixture main body for holding the low圧放lamp, a ballast for lighting the low-pressure discharge lamp, characterized in that a deterioration degree detecting device according to claim 3 or 4.   The lighting apparatus according to claim 5, further comprising: a control device that stops the ballast or reduces an output when a deterioration degree detected by the deterioration degree detection device exceeds a predetermined upper limit value.   The lighting apparatus according to claim 5, further comprising a notification unit that notifies the deterioration level detected by the deterioration level detection device.

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