JPH11102798A - Discharge lamp lighting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a discharge lamp lighting device which is capable of restraining power consumption of a remote signal monitoring circuit. SOLUTION: A remote signal monitoring circuit is constituted of a photocoupler 14, consisting of a phototransistor 14b connected to a light-emitting diode 14a for emitting light according to the contents of a remote signal from a illumination control system 11 and a low-voltage power source 13, a switching element 21 connected in series to the phototransistor 14b, a pulse-generating circuit 22 for turning on the switching element 21 intermittently, and a remote signal discriminating circuit 16, when the switching element 21 is turned on, for discriminating the contents of the remote signal through the phototrasistor 14b, and generating a signal based on the discrimination result.

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 discharge lamp such as a fluorescent lamp at a high frequency, and more particularly to a remote signal monitor for detecting a remote signal from a lighting control system for turning on / off a discharge lamp remotely. It is related to the circuit.

[0002]

2. Description of the Related Art FIG. 5 is a block diagram showing the configuration of a conventional discharge lamp lighting apparatus. In FIG. 5, reference numeral 1 denotes a commercial power supply, 2 denotes a rectifying / smoothing circuit for converting AC of the commercial power supply 1 to DC,
Is an inverter circuit that converts the DC power of the rectifier / smoothing circuit 2 into high-frequency power based on a control signal from the control circuit 4 and supplies the high-frequency power to the discharge lamp 5.

An illumination control system 11 outputs a remote ON / OFF signal for turning on or off the discharge lamp 5 in response to a key operation, for example, and monitors the state of the discharge lamp 5 based on the output. Is a remote signal monitoring circuit, which is a remote ON / OF from the lighting control system 11.
A photocoupler 14 including a light emitting diode 14a that emits light in response to the F signal and a phototransistor 14b having a collector connected to the low voltage power supply 13, and a resistor 1 inserted between the emitter of the phototransistor 14b and ground.
5 and a remote signal discriminating circuit 16 for discriminating ON / OFF of the remote signal according to ON / OFF of the phototransistor 14b and outputting an ON / OFF signal to the control circuit 4 based on the discrimination result. ing.

In the conventional discharge lamp lighting device configured as described above, the remote signal discriminating circuit 16 of the remote signal monitoring circuit 12 outputs a signal from the illumination control system 11 when the phototransistor 14b of the photocoupler 14 is turned off. Judges that the remote signal is OFF and sends the control circuit 4 an OF signal.
An F signal is output, and when the light emitting diode 14a of the photocoupler 14 emits light and the phototransistor 14b is turned on by remote control from the lighting control system 11, it is determined to be a remote ON signal and an ON signal is output to the control circuit 4. I do.

[0005]

However, in the above-described conventional discharge lamp lighting device, the content of the remote signal from the illumination control system 11 is constantly monitored. A current of several mA flows on the phototransistor 14b side, so that the power consumption of the remote signal monitoring circuit 12 has increased.

SUMMARY OF THE INVENTION The present invention has been made to solve such a problem, and can reduce the power consumption of a remote signal monitoring circuit without impairing the function of monitoring a remote signal. It is an object of the present invention to provide a discharge lamp lighting device capable of quickly turning off a discharge lamp by an operation.

[0007]

SUMMARY OF THE INVENTION A discharge lamp lighting device according to the present invention comprises a low-voltage power supply, a low-voltage power supply applied at predetermined time intervals, and a remote-controlled illumination when the low-voltage power supply is applied. Determine the content of the remote signal from the control system,
A remote signal monitoring circuit for generating a signal for controlling the discharge lamp based on the determination result.

Further, the discharge lamp lighting device of the present invention includes a rectifying / smoothing circuit for converting a commercial power supply to DC, and an inverter circuit for converting the DC power of the rectifying / smoothing circuit to high-frequency power and supplying the high-frequency power to the discharge lamp. A low-voltage power supply, and applying the low-voltage power supply at predetermined time intervals, and, when the low-voltage power supply is applied, determining the content of a remote signal from a lighting control system by remote control, based on the determination result, A remote signal monitoring circuit for generating a signal for controlling the inverter circuit.

The remote signal monitoring circuit applies the low-voltage power at predetermined time intervals, and when the low-voltage power is applied, determines the content of a remote signal from a lighting control system by remote control when the low-voltage power is applied. When a signal is detected, a signal for starting the inverter circuit is generated, and at the time of starting the inverter circuit, a predetermined voltage obtained from the inverter circuit is continuously applied as a low-voltage power supply.

Further, a discharge lamp lighting device according to the present invention includes a rectifying / smoothing circuit for converting a commercial power supply into DC, an active filter circuit provided on an output side of the rectifying / smoothing circuit,
An inverter circuit that converts DC power applied through the active filter circuit into high-frequency power and supplies the high-frequency power to a discharge lamp; a low-voltage power supply; applying the low-voltage power at predetermined time intervals; When a remote ON signal is detected, a signal for activating the inverter circuit is generated when a remote ON signal is detected, and when activation of the active filter circuit is detected. And a remote signal monitoring circuit for continuously applying a predetermined voltage obtained from the active filter circuit as a low-voltage power supply.

The remote signal monitoring circuit includes a photocoupler including a light emitting diode that emits light in accordance with the content of a remote signal from a lighting control system by remote control, and a phototransistor connected to the low-voltage power supply. A switching element connected in series, a pulse generation circuit for intermittently turning on the switching element, and determining the content of the remote signal through the phototransistor when the switching element is turned on; And a remote signal discriminating circuit for generating the same.

Further, the remote signal monitoring circuit includes a photocoupler including a light emitting diode that emits light in accordance with the content of a remote signal from a remote control illumination control system, and a phototransistor connected to the low voltage power supply. A switching element connected in series to the transistor, a pulse generation circuit for intermittently turning on the switching element, and determining the content of the remote signal through the phototransistor when the switching element is turned on, A remote signal discriminating circuit for generating a signal for activating the inverter circuit when detected, and outputting an H level signal to the switching element when detecting the activation of the inverter circuit; Voltage is continuously marked as a low-voltage power supply. And an inverter activation detection circuit.

Still further, the remote signal monitoring circuit includes a photocoupler including a light emitting diode that emits light in accordance with the content of a remote signal from a remote control illumination control system, and a phototransistor connected to the low voltage power supply. A switching element connected in series to the phototransistor;
N pulse generator circuit and the switching element is ON
When a remote signal is detected through the phototransistor, a remote ON signal is detected, a remote signal determination circuit that generates a signal for activating the inverter circuit, and when the activation of the active filter circuit is detected. And an active filter activation detection circuit for outputting a high-level signal to the switching element to continuously apply a predetermined voltage obtained from the active filter circuit as a low-voltage power supply.

Further, the low-voltage power supply is a voltage obtained by a step-down resistor provided on the collector side of the phototransistor.

The pulse generation circuit sets the pulse cycle to 1se
c, It repeatedly outputs a pulse signal having a pulse width of 10 msec.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION

Embodiment 1 FIG. FIG. 1 is a block diagram showing a configuration of a remote signal monitoring circuit of a discharge lamp lighting device according to a first embodiment of the present invention, and the same or corresponding parts as those of the related art described with reference to FIG. And the description is omitted. In the first embodiment, the switching element 2 is connected to the remote signal monitoring circuit 12.
1 and a pulse generation circuit 22. The switching element 21 is inserted between the emitter of the phototransistor 14b and the resistor 15, and the pulse generation circuit 22
Generates a pulse signal having a pulse period of 1 sec and a pulse width of 10 msec, for example, and drives the switching element 21 intermittently.

In the discharge lamp lighting device configured as described above, the switching element 21 is
, The low-voltage power supply 13 is applied to the remote signal monitoring circuit 12 in accordance with the intermittent driving of the switching element 21 irrespective of the input of the remote ON / OFF signal from the lighting control system 11. It is supplied to the phototransistor 14b side of the photocoupler 14. On the other hand, the remote signal determination circuit 16
When the switching element 21 is turned on, it is determined whether or not the phototransistor 14b of the photocoupler 14 is on based on, for example, a current value from the phototransistor 14b flowing through the switching element 21 and turning off the phototransistor 14b. Is detected, a remote signal from the illumination control system 11 is determined to be OFF, and an OFF signal for controlling a discharge lamp (not shown) is generated. When ON of the phototransistor 14b is detected, it is determined to be an ON remote signal. To generate an ON signal.

As described above, the switching element 21 is turned on by a pulse signal having a pulse period of 1 sec and a pulse width of 10 msec.
Since the low-voltage power supply 13 is intermittently applied with N · OFF, there is an effect that the power consumption of the remote signal monitoring circuit 12 can be significantly reduced as compared with the related art.

Embodiment 2 FIG. FIG. 2 is a block diagram showing the configuration of a discharge lamp lighting device according to a second embodiment of the present invention. In the first embodiment described with reference to FIGS. The same reference numerals are given and the description is omitted. In the second embodiment, the rectifying / smoothing circuit 2
Is provided between one of the output terminals of the two and the collector of the phototransistor 14b of the photocoupler 14 provided in the remote signal monitoring circuit 12. The rectifying / smoothing circuit is provided by the step-down resistor 23. The second DC power supply is stepped down to, for example, 12 V, and used as the low-voltage power supply 13 of the remote signal monitoring circuit 12. Note that the low-voltage power supply 13
Rectification and smoothing may be performed after the commercial power supply 1 is stepped down by the step-down resistor 23. Further, the pulse generation circuit 22 for intermittently driving the switching element 21 has the pulse period 1 as described above.
A pulse signal having a pulse width of 10 msec is output in sec.

Next, the operation will be described. As described above, since the switching element 21 is intermittently driven by the pulse signal of the pulse generation circuit 22, the step-down resistor 23
Is intermittently applied to the remote signal monitoring circuit 12. On the other hand, when the switching element 21 is turned on as described above, the remote signal determination circuit 16
Is ON or not, and the phototransistor 14
When b is detected to be OFF, the remote signal from the illumination control system 11 is determined to be OFF, an OFF signal is generated, and the OFF signal is output to the control circuit 4 to stop the inverter circuit 3 and to turn ON the phototransistor 14b. When it is detected, it is determined to be an ON remote signal, an ON signal is generated, and the ON signal is output to the control circuit 4 to activate the inverter circuit 3.

As described above, in the second embodiment,
Since the low-voltage power supply 13 is generated by the step-down resistor 23 and applied to the remote signal monitoring circuit 12 according to the intermittent driving of the switching element 21 for 10 msec, the power consumption of the remote signal monitoring circuit 12 can be reduced. Since the DC power of the rectifying / smoothing circuit 2 is intermittently applied to the step-down resistor 23, the step-down resistor 23 having a relatively small size can be used.

In the second embodiment, the remote signal monitoring circuit 12 is provided in the discharge lamp lighting device provided with the inverter circuit 3. However, the discharge lamp lighting device which does not include the inverter circuit 3 and requires remote control is provided. It may be provided in the device.

Embodiment 3 FIG. FIG. 3 is a block diagram showing a configuration of a discharge lamp lighting device according to a third embodiment of the present invention. The same or corresponding parts as those in the second embodiment described with reference to FIG. Description is omitted. In the third embodiment, the OR circuit 24 and the inverter activation detection circuit 2 are added to the remote signal monitoring circuit 12 shown in the second embodiment.
In the OR circuit 24, the output terminal is connected to the base of the switching element 21, one input terminal is connected to the pulse generation circuit 22, and the other input terminal is the inverter start detection circuit 25. It is connected to the. When detecting the activation of the inverter circuit 3 through the control circuit 4, the inverter activation detection circuit 25 outputs, for example, an H-level signal to the switching element 21 via the OR circuit 24.

The remote signal monitoring circuit 12 according to the present embodiment uses the voltage obtained by the step-down resistor 23 as the low-voltage power supply 13 when the inverter circuit 3 is stopped, and outputs the voltage when the inverter circuit 3 is started. The predetermined voltage obtained by the circuit 3 is a low-voltage power supply 13. Further, the pulse generation circuit 22 of the remote signal monitoring circuit 12 generates a pulse signal having a pulse period of 1 sec and a pulse width of 10 msec as described above, and intermittently drives the switching element 21 via the OR circuit 24. ing.

Next, the operation of the discharge lamp lighting device of the present embodiment will be described. When the remote OFF signal is being input, the switching element 21 is intermittently driven based on the input of the pulse signal of the pulse generation circuit 22, so that the voltage obtained by the step-down resistor 23 is low in the remote signal monitoring circuit 12. The voltage is applied intermittently as the voltage power supply 13. At that time, when the switching element 21 is turned on by the input of the pulse signal, the remote signal determination circuit 16 outputs the remote signal through the operation state of the phototransistor 14b of the photocoupler 14. Determine the content (ON / OFF),
ON from OFF signal when remote ON signal is detected
The signal is switched to a signal and output to the control circuit 4 to activate the inverter circuit 3.

On the other hand, when the activation of the inverter circuit 3 is detected by the control circuit 4, the inverter activation detection circuit 25 outputs an H level signal to the switching element 21 via the OR circuit 24 to be continuously turned on, and the remote signal is output. The predetermined voltage obtained by the inverter circuit 3 is applied to the monitoring circuit 12 as the low-voltage power supply 13. In addition, the remote signal discrimination circuit 16 operates by the continuous ON of the switching element 21.
The content of the remote signal is continuously transferred to the phototransistor 4b.
When the OFF of the phototransistor 4b is detected, an OFF signal is output to the control circuit 4 to stop the driving of the inverter circuit 3.

According to the present embodiment, when the inverter circuit 3 is stopped, the voltage obtained by the step-down resistor 23 is intermittently applied as the low-voltage power supply 13, and when the inverter circuit 3 is started, Since the predetermined voltage obtained by the inverter circuit 3 is continuously applied as the low-voltage power supply 13, in addition to the effect of the second embodiment that the step-down resistor 23 having a small size can be used,
There is an effect that the responsiveness when the remote OFF signal is detected can be increased, and the power consumption of the remote signal monitoring circuit 12 when the inverter circuit is stopped can be reduced.

Embodiment 4 FIG. 4 is a block diagram showing the configuration of a discharge lamp lighting device according to a fourth embodiment of the present invention. The same or corresponding parts as those of the third embodiment described with reference to FIG. Description is omitted. The fourth embodiment is a discharge lamp lighting device provided with an A / F circuit (active filter circuit) 6 between the rectifying / smoothing circuit 2 and the inverter circuit 3. A / F instead of the inverter start detection circuit 25 of the embodiment
An activation detection circuit 26 is provided. The A / F activation detection circuit 26 outputs, for example, an H level signal to the switching element 21 via the OR circuit 24 when the activation of the A / F circuit 6 is detected.

The remote signal monitoring circuit 12 according to the present embodiment uses the voltage obtained by the step-down resistor 23 as the low-voltage power supply 13 when the inverter circuit 3 is stopped, and operates when the A / F circuit 6 is started. Is a predetermined voltage obtained by the circuit 6 as a low-voltage power supply 13. Further, as described above, the pulse period from the pulse generation circuit 22 is 1 second,
A pulse signal having a pulse width of 10 msec is output.

Next, the operation of the discharge lamp lighting device of the present embodiment will be described. When the remote OFF signal is being input, the switching element 21 is intermittently driven based on the input of the pulse signal of the pulse generation circuit 22, so that the voltage obtained by the step-down resistor 23 is low in the remote signal monitoring circuit 12. The voltage is applied intermittently as the voltage power supply 13. At that time, when the switching element 21 is turned on by the input of the pulse signal, the remote signal determination circuit 16 outputs the remote signal through the operation state of the phototransistor 14b of the photocoupler 14. Determine the content (ON / OFF),
ON from OFF signal when remote ON signal is detected
The signal is switched to a signal and output to the control circuit 4 to activate the inverter circuit 3.

On the other hand, the A / F activation detection circuit 26
When the activation of the circuit 6 is detected, an H-level signal is output to the switching element 21 via the OR circuit 24 and is continuously turned on. At this time, a predetermined voltage obtained by activating the A / F circuit 6 is applied as the low voltage power supply 13. When the switching element 21 is continuously turned on, the remote signal determination circuit 16 continuously determines the content of the remote signal through the phototransistor 4b, and turns off the phototransistor 4b.
Is detected, an OFF signal is output to the control circuit 4 and the driving of the inverter circuit 3 is stopped.

According to the present embodiment, when the A / F circuit 6 is stopped, the voltage obtained by the step-down resistor 23 is intermittently applied as the low-voltage power supply 13, and the A / F circuit 6 is driven. When the switching element 21 is continuously ON
The predetermined voltage obtained by the A / F circuit 6 is supplied to the low-voltage power supply 13.
As a result, in addition to the effect of the second embodiment that the step-down resistor 23 having a small size can be used, the responsiveness when the remote OFF signal is detected can be increased, and In addition, the power consumption of the remote signal monitoring circuit 12 when the A / F circuit is stopped can be reduced.

[0033]

As described above, according to the present invention, the low-voltage power supply for detecting the remote signal from the lighting control system is applied at predetermined time intervals, so that the power consumption of the remote signal monitoring circuit is reduced. The effect of being able to keep it small is obtained.

Further, a low-voltage power supply is applied every predetermined time,
In addition, since the content of the remote signal from the lighting control system by remote control is determined when the low-voltage power is applied, the power consumption of the remote signal monitoring circuit is reduced even in a discharge lamp lighting device including an inverter circuit. The effect that it can be suppressed is obtained.

Further, a low-voltage power supply is applied every predetermined time,
Also, when a low-voltage power supply is applied, the contents of a remote signal from the lighting control system by remote control are determined, and when a remote ON signal is detected, a signal for activating the inverter circuit is generated, and the inverter circuit is activated. At startup, a predetermined voltage obtained from the inverter circuit is continuously applied as a low-voltage power supply, so that the response of turning off the discharge lamp by remote operation can be quickened. The effect that power consumption can be reduced is obtained.

Further, a low-voltage power supply is applied every predetermined time,
In addition, when a low-voltage power supply is applied, the content of a remote signal from the lighting control system by remote operation is determined, and when a remote ON signal is detected, a signal for activating the inverter circuit is generated, and the activation of the active filter circuit is performed. When detection is performed, a predetermined voltage obtained from the active filter circuit is continuously applied as a low-voltage power supply, so that even in a discharge lamp lighting device equipped with an active filter circuit, the response of turning off the discharge lamp by remote operation can be quickly performed. In addition, there is an effect that the power consumption of the remote signal monitoring circuit when the active filter circuit is stopped can be reduced.

Further, a switching element is connected in series to the phototransistor of the photocoupler connected to the low-voltage power supply, and the switching element is intermittently turned on by the pulse generation circuit. This is advantageous in that the power consumption of the remote signal monitoring circuit can be reduced as compared with the related art in which the current flows.

Further, when a switching element is connected in series to a phototransistor of a photocoupler connected to a low-voltage power supply, the switching element is intermittently turned on by a pulse generation circuit, and when the switching element is turned on. Remote signal ON through phototransistor
When the inverter is detected, the switching element is turned on continuously by the inverter start detection circuit, so that the power consumption of the remote signal monitoring circuit when the inverter circuit is stopped can be reduced, and the discharge lamp by remote operation can be suppressed. This has the effect that the response of OFF can be made faster.

A switching element is connected in series to a phototransistor of a photocoupler connected to a low-voltage power supply, and the switching element is intermittently turned on by a pulse generation circuit. When the ON of the remote signal is detected through the transistor, the switching element is continuously turned ON by the active filter activation detection circuit, so that the power consumption of the remote signal monitoring circuit when the active filter circuit is stopped can be reduced. In addition to this, there is an effect that the response of turning off the discharge lamp by remote control can be made faster.

Since the voltage obtained by the step-down resistor is used as the low-voltage power supply and the voltage is intermittently applied to the remote signal monitoring circuit, power consumption can be suppressed, and a relatively small resistor can be used. The effect that it can be used is obtained.

Further, since the pulse signal output to the switching element has a pulse period of 1 sec and a pulse width of 10 msec, the power consumption of the remote signal monitoring circuit can be greatly reduced.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of a remote signal monitoring circuit of a discharge lamp lighting device according to a first embodiment of the present invention.

FIG. 2 is a block diagram illustrating a configuration of a discharge lamp lighting device according to a second embodiment of the present invention.

FIG. 3 is a block diagram illustrating a configuration of a discharge lamp lighting device according to a third embodiment of the present invention.

FIG. 4 is a block diagram illustrating a configuration of a discharge lamp lighting device according to a fourth embodiment of the present invention.

FIG. 5 is a block diagram showing a configuration of a conventional discharge lamp lighting device.

[Explanation of symbols]

11 lighting control system, 12 remote signal monitoring circuit, 13 low voltage power supply, 14 photocoupler, 1
6 remote signal determination circuit, 21 switching element, 22 pulse generation circuit, 24 OR circuit, 2
5 Inverter start detection circuit, 26 A / F start detection circuit.

 ──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Kenichiro Nishi 2-3-2 Marunouchi, Chiyoda-ku, Tokyo Mitsui Electric Co., Ltd. (72) Takeshi Arai 2-3-2 Marunouchi, Chiyoda-ku, Tokyo 2-3 Rishi Electric Co., Ltd. (72) Inventor Takehisa Hamaguchi 2-3-2 Marunouchi, Chiyoda-ku, Tokyo Sanishi Electric Co., Ltd. (72) Inventor Kentaro Eguchi 2-3-2 Marunouchi, Chiyoda-ku, Tokyo Mitsuishi Inside Electric Co., Ltd. (72) Inventor Tetsuya Kobayashi 5-1-1, Ofuna, Kamakura City, Kanagawa Prefecture Inside Mitsubishi Electric Lighting Co., Ltd.

Claims (9)

[Claims] 1. A low-voltage power supply, and the low-voltage power supply is applied at predetermined time intervals, and when the low-voltage power supply is applied, the contents of a remote signal from a lighting control system by remote operation are determined, and the determination result is provided. And a remote signal monitoring circuit for generating a signal for controlling the discharge lamp based on the control signal. 2. A rectifier / smoothing circuit for converting a commercial power supply to a direct current, an inverter circuit for converting a direct current power supply of the rectifier / smoothing circuit to a high frequency power and supplying the high frequency power to a discharge lamp, a low voltage power supply, A power source is applied at predetermined time intervals, and when a low-voltage power source is applied, the content of a remote signal from the lighting control system is determined by remote control, and a signal for controlling the inverter circuit is generated based on the determination result. A discharge lamp lighting device comprising a remote signal monitoring circuit. 3. The remote signal monitoring circuit applies the low-voltage power at predetermined time intervals, and determines the content of a remote signal from a lighting control system by remote operation when the low-voltage power is applied, When a remote ON signal is detected, a signal for activating the inverter circuit is generated, and when the inverter circuit is activated, a predetermined voltage obtained from the inverter circuit is continuously applied as a low-voltage power supply. Item 3. A discharge lamp lighting device according to Item 2. 4. A rectifying / smoothing circuit for converting a commercial power supply into DC, an active filter circuit provided on an output side of the rectifying / smoothing circuit, and a high-frequency power And a low-voltage power supply, and a remote signal from a lighting control system that is remotely operated when the low-voltage power is applied. When the remote ON signal is detected, a signal for activating the inverter circuit is generated. When the activation of the active filter circuit is detected, a predetermined voltage obtained from the active filter circuit is continuously used as a low-voltage power supply. A discharge signal lighting device, comprising: a remote signal monitoring circuit for applying voltage. 5. A photo-coupler comprising a light-emitting diode that emits light in accordance with the content of a remote signal from a remote-controlled lighting control system and a phototransistor connected to the low-voltage power supply; A switching element connected in series to the transistor, a pulse generating circuit for intermittently turning on the switching element, and determining the content of the remote signal through the phototransistor when the switching element is turned on, based on the determination result. 3. The discharge lamp lighting device according to claim 1, further comprising: a remote signal discriminating circuit for generating a signal by using the control signal. 6. A photo-coupler comprising a light-emitting diode that emits light in accordance with the content of a remote signal from a lighting control system by remote control, and a photo-transistor connected to the low-voltage power supply; A switching element connected in series to the transistor, a pulse generation circuit for intermittently turning on the switching element, and determining the content of the remote signal through the phototransistor when the switching element is turned on, A remote signal discrimination circuit for generating a signal for activating the inverter circuit when detected, and an H signal for detecting activation of the inverter circuit.
4. An inverter start detecting circuit for outputting a level signal to the switching element and continuously applying a predetermined voltage obtained from the inverter circuit as a low-voltage power supply. Discharge lamp lighting device. 7. The remote signal monitoring circuit includes: a photocoupler including a light emitting diode that emits light in accordance with the content of a remote signal from a remote control illumination control system, and a phototransistor connected to the low voltage power supply; A switching element connected in series to the transistor, a pulse generation circuit for intermittently turning on the switching element, and determining the content of the remote signal through the phototransistor when the switching element is turned on, A remote signal discriminating circuit for generating a signal for activating the inverter circuit when detected, and outputting an H level signal to the switching element when detecting activation of the active filter circuit, and obtaining the signal from the active filter circuit. Specified voltage as low-voltage power supply 5. The discharge lamp lighting device according to claim 4, further comprising an active filter activation detection circuit that continuously applies the discharge signal. 8. The discharge lamp lighting device according to claim 1, wherein the low-voltage power supply is a voltage obtained by a step-down resistor provided on a collector side of the phototransistor. . 9. The pulse generation circuit according to claim 1, wherein the pulse period is one.
8. The discharge lamp lighting device according to claim 5, wherein a pulse signal having a pulse width of 10 msec is repeatedly output.