JP2008243530A - Illumination dimming control system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To correctly determine abnormal state different in types occurring in a luminaire without needing to install a new signal line, in an illumination dimming control system for controlling the dimming of a plurality of luminaires by transmitting a dimming signal through a dimming signal line from a dimming control device. <P>SOLUTION: A fluorescent lamp luminaire Fa connected to the dimming control device 2 through the dimming signal line L1 includes two types of detectors such as an illuminance sensor 11 and a time measurement instrument 12 as an abnormal state detector Fa3, and switch devices 13 and 14 short-circuiting the dimming signal line L1 by the abnormal state detection signal from the respective detectors. The capacitance values of a capacitor 15 and a capacitor 16 respectively interlaid in short-circuiting paths L1a of the dimming signal line L1 short-circuited for a predetermined period by the respective switch devices 13 and 14 are set to values different from each other to set charging periods thereof at values different from each other, and set to set charging periods thereof at values different from each other. The dimming control device 2 measures the charging periods when the capacitors 15 and 16 are charged, and determines the type of the abnormal state based on the measured charging periods. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an illumination dimming control system that transmits a dimming signal from a dimming control device and performs dimming control on a plurality of lighting fixtures in a concentrated manner.

In a lighting control system that transmits a dimming signal from a dimming control device to a plurality of lighting fixtures via a dimming signal line and performs dimming control on these lighting fixtures, the lamp life is detected for each lighting fixture. It is known that a detection circuit is provided, and when the lamp life detection circuit detects the lamp life, the light control signal line is short-circuited to transmit the lamp life to the light control device (for example, Patent Documents). 1).
JP 2005-222919 A

  In the illumination control system described in Patent Literature 1, since the lamp life detection circuit that detects the life of the lamp is provided for each lighting device, the life of the lamp can be determined for each lighting device, for example, common to each lighting device. Compared to a system in which all lamps of all lighting fixtures connected to the power supply device are considered to be at the end of their life when the cumulative energization time of the power supply device reaches a predetermined time, the lifespan of the power supply device is reliably increased. There is an advantage that only the reaching lamp can be replaced.

  By the way, in the lighting fixture, there are some items to be detected such as a failure of the lamp lighting circuit and a lack of illuminance in addition to the life of the lamp. In the lighting control system described in Patent Document 1, the dimming signal By short-circuiting the wire, a short-circuit current is sent to the dimming signal line to transmit the lamp life end to the control device, so even if the lighting fixture is provided with a function to detect other items other than the lamp life end, These detection results cannot be transmitted to the control device in distinction from the end of lamp life.

  More specifically, in the lighting control system described in Patent Document 1, when the lighting fixture includes a detection circuit for another item other than the lamp life detection circuit, the detection circuit for the other item may be used for the lighting fixture. Even if the dimming signal line is short-circuited when a malfunction is detected, the control device cannot distinguish whether the dimming signal line is short-circuited due to the end of the lamp life or a short-circuit due to another malfunction. Therefore, in order to transmit the detection results from the detection circuit of other items to the control device in distinction from the end of the lamp life, it is necessary to install a signal line separately from the dimming signal line, resulting in a significant system cost. Will invite up.

  Therefore, the present invention provides a lighting dimming control system that controls dimming of a plurality of lighting fixtures by transmitting a dimming signal from the dimming control device via the dimming signal line, and does not require a new signal line. An object of the present invention is to provide an illumination dimming control system in which the dimming control device can correctly determine different types of abnormal states occurring in the lighting fixture.

  In order to achieve the above object, a first aspect of the present invention provides a plurality of lighting fixtures including a light source and a lighting circuit, and dimming for transmitting a dimming signal to the lighting fixtures via a dimming signal line. Each of the lighting fixtures is dimmed by an abnormal state detection unit that detects an abnormal state of each lighting fixture, and an abnormal state detection signal from the abnormal state detection unit. A switch for short-circuiting the signal line for a predetermined time, and a capacitance unit having a different capacitance value for each type of abnormal state interposed in a short circuit formed by the switch, the dimming control device, A charging time measuring unit for measuring a charging time until a potential of the dimming signal becomes a predetermined value when a short circuit is formed by the switch and charging of the capacitor unit is started; and the charging time measuring unit Measured Characterized in that and a determination unit that determines the type of the abnormal state based on the charging time.

  According to a second aspect of the present invention, in the illumination dimming control system according to the first aspect, the determination unit is based on a total charging time when a plurality of capacitance units having different capacitance values are charged. And determining the type of a plurality of abnormal states.

  According to the first aspect of the present invention, the capacitance units having different capacitance values are charged according to the type of the abnormal state detected by the abnormal state detection unit of the lighting fixture, and the dimming control device charges the capacitance unit. Since the type of abnormal state is determined based on time, it is possible to correctly detect different types of abnormal states that occur in lighting fixtures by detecting the charging time of the target dimming signal line without requiring a new signal line. Can be determined.

  According to the invention of claim 2, the determination unit of the dimming control device has a plurality of types of abnormal states based on the total charging time when a plurality of capacitance units having different capacitance values are charged. Therefore, even when a plurality of abnormal states occur simultaneously in the lighting fixture, different types of abnormal states occurring in the lighting fixture can be correctly determined.

(First embodiment)
Hereinafter, an illumination dimming control system according to a first embodiment of the present invention will be described with reference to FIGS. 1 to 8. As shown in FIG. 1, the dimming control system 1 of the present embodiment includes a dimming control device 2 that transmits a dimming signal S to four systems of dimming signal lines L1, L2, L3, and L4. A remote controller 3 that is operated by a user to output an operation signal to the dimming control device 2 and fluorescent lamp lighting devices Fa and Fb and incandescent lamp lighting respectively connected to the dimming signal lines L1, L2, L3, and L4 A fixture R and an LED lighting fixture E are provided. The dimming signal S is a PWM (Pulse Width Modulation) signal.

  The dimming signal lines L1, L2, L3, and L4 are shown as one line in FIG. 1, but are actually composed of two parallel lines. Each of the lighting fixtures Fa, Fb, R, E includes fluorescent lamps Fa1, Fb1, incandescent lamp R1, LEDE1, lighting circuits Fa2, Fb2, R2, E2, and abnormal state detectors Fa3, Fb3, R3, as light sources, respectively. E3 and switch devices (switches) Fa4, Fb4, R4 for short-circuiting the dimming signal lines L1, L2, L3, L4 for a predetermined time when an abnormality is detected by the abnormal state detection units Fa3, Fb3, R3, E3, E4 is provided. The abnormal state detection units Fa3, Fb3, R3, and E3 and the switching devices Fa4, Fb4, R4, and E4 will be described in detail later.

  A plurality of fluorescent lamp luminaires Fa and Fb, incandescent lamp luminaires R, and LED luminaires E are connected in parallel to the dimming signal lines L1, L2, L3, and L4. When the illumination dimming control system 1 is provided as an office lighting facility, the fluorescent lamp luminaires Fa, Fa,... Connected to the dimming signal line L1, and the fluorescent lamp connected to the dimming signal line L2. Of lighting fixtures Fb, Fb..., Groups of incandescent lighting fixtures R, R... Connected to dimming signal line L3, and LED lighting fixtures E, E. Groups are arranged to illuminate different areas of the office.

  The dimming control device 2 includes a microprocessor 23 (determination unit) to which a predetermined operating voltage is supplied from a commercial power supply 21 via a power supply circuit 22, and each dimming signal line L1, L2, L3 controlled by the microprocessor 23. , L4, a dimming signal output circuit 24 that outputs a predetermined dimming signal S (PWM signal), and the dimming signal lines L1, L2, L3, and L4, respectively, are switch devices Fa4 and Fb4 of any of the lighting fixtures. , R4, E4 measured when the capacitor (capacitance part) interposed in the short circuit path of each dimming signal line L1, L2, L3, L4 is charged to a predetermined voltage (potential) when short-circuited by R4, E4 And a charging time measuring circuit 25 for outputting the measured value to the microprocessor 23, an information table (described later) in which charging times corresponding to the types of abnormal states of the lighting fixtures Fa, Fb, R, and E are recorded. The stored storage unit 26, the infrared light receiving unit 27 that receives the infrared rays transmitted from the remote controller 3 and outputs a command signal superimposed on the infrared rays to the microprocessor 23, and the luminaires Fa, Fb detected by the microprocessor 23, And an alarm device 29 that notifies the user of the abnormal states of R and E so that the user can distinguish them. The alarm device 29 can be configured by a lamp such as an LED that outputs light and a speaker that outputs sound. Further, the infrared light receiving unit 27 may receive a specific low-power radio or other radio wave.

  The light output of each of the lighting fixtures Fa, Fb, R, and E changes according to the on-duty value of the input PWM signal S. In the present embodiment, the light output of the incandescent lamp luminaire R and the fluorescent lamp luminaires Fa and Fb decreases almost in proportion to the increase of the on-duty value, and the LED luminaire E increases the on-duty value. The light output increases exponentially. The relationship between the light output values corresponding to the on-duty values for the respective lighting fixtures Fa, Fb, R, and E is stored in the storage unit 26 as dimming control information. When an appropriate command is received from the remote controller 3 via the remote controller 3 (for example, “turn on the fluorescent lamp luminaire Fa with a light output of 50%”), the luminaires Fa, Fb, R, and E to be controlled are designated. The on-duty value that becomes the optical output is searched from the dimming control information, and the dimming signal output circuit 24 is controlled to output the dimming signal S of that on-duty value.

  Hereinafter, the lighting circuit Fa2, the abnormal state detection unit Fa3, and the switch device Fa4 of the fluorescent lamp lighting device Fa will be described with reference to FIGS. The incandescent lamp luminaire R and the LED luminaire E will be described later. Since the configuration of the fluorescent lamp luminaire Fb is the same as that of the fluorescent lamp luminaire Fa, description thereof is omitted.

  As shown in FIG. 2, the lighting circuit Fa2 of the fluorescent lamp lighting device Fa includes a power supply circuit 32 that converts the voltage, current, and the like of the power supply from the commercial power supply 21 to predetermined values, and the power supply circuit 32 converts the voltage to a predetermined voltage. An oscillation circuit 34 that converts the oscillation cycle of the converted power into a lighting cycle of the fluorescent lamp Fa1, and an oscillation cycle control that controls the oscillation cycle converted by the oscillation circuit 34 to a value corresponding to the dimming signal S (PWM signal). The oscillation cycle control unit 35 emits the fluorescent lamp Fa1 with a predetermined output by changing the oscillation cycle according to the on-duty of the dimming signal S input via the dimming signal line L1. Let The switch device Fa4 is connected to the dimming signal line L1 in the previous stage of the oscillation cycle control unit 35.

  Specifically, for example, when the PWM signal S having an on-duty value of 90% is input via the dimming signal line L1, the oscillation cycle control unit 35 sets the oscillation cycle of the oscillation circuit 34 according to the PWM signal S. To control the fluorescent lamp Fa1 to emit light at an output of 11%.

  In this embodiment, the abnormal state detection unit Fa3 provided in the fluorescent lamp illumination device Fa, as shown in FIG. 3, the illuminance sensor 11 that detects the light output of the fluorescent lamp Fa1, and the cumulative lighting time of the fluorescent lamp Fa1. There are two types of detectors: a time measuring device 12 for measuring The illuminance sensor 11 outputs an abnormal state detection signal s11 to the switch device Fa4 when the light output from the fluorescent lamp Fa1 is lower than a predetermined illuminance value set in advance. When the lighting time of Fa1 reaches a predetermined cumulative time set in advance, an abnormal state detection signal s12 is output to the switching device Fa4.

  As shown in FIG. 3, the switch device Fa4 includes a switch device 13 to which an abnormal state detection signal s11 from the illuminance sensor 11 is input, and a switch device 14 to which the abnormal state detection signal s12 from the time measuring device 12 is input. And normally-off transistors 13a, 14a connected between two parallel dimming signal lines L1, and timer circuits 13b, 14b for controlling on / off of the transistors 13a, 14a, respectively. Prepare. Capacitors 15 and 16 (capacitance sections) having different capacitance values are connected to a short circuit L1a of the dimming signal line L1 formed by turning on the transistors 13a and 14a.

  In this embodiment, the capacitance values C15 and C16 of the capacitors 15 and 16 are equal to the capacitance value C15 of the capacitor 15 of the short circuit L1a formed by the abnormal state detection signal s11 from the illuminance sensor 11. It is set larger than the capacitance value C16 of the capacitor 16 of the short circuit L1a formed by the abnormal state detection signal s12 from the measuring instrument 12.

  Each of the timer circuits 13b and 14b starts measuring time by the abnormal state detection signal s11 from the illuminance sensor 11 and the abnormal state detection signal s12 from the time measuring device 12, respectively. Regarding the on / off timing of the timer circuits 13b and 14b, the output timing of the abnormal state detection signals s11 and s12, the power-on timing of the dimming control device 2, the voltage of the dimming signal line L1, and the change in illuminance of the fluorescent lamp Fa1 This will be described with reference to 4 (a) and (b). 4A shows a case where the timer circuit 13b of the switch device 13 is turned on by the abnormal state detection signal s11 from the illuminance sensor 11, and FIG. 4B shows an abnormal state detection signal s12 from the time measuring device 12. Shows a case where the timer circuit 14b of the switch device 14 is turned on.

  First, a case where the timer circuit 13b of the switch device 13 is turned on by the abnormal state detection signal s11 from the illuminance sensor 11 (FIG. 4A) will be described. The power source of the dimming control device 2 is turned on at time t1, the dimming signal output circuit 24 of the dimming control device 2 outputs a dimming signal S having a predetermined on-duty value at the voltage V, and the fluorescent lamp Fa1 Light is emitted at an output corresponding to the on-duty, and the illuminance sensor 11 detects the illuminance K. At time t2, the illuminance sensor 11 detects a decrease in light output from the fluorescent lamp Fa1, outputs an abnormal state detection signal s11, the timer circuit 13b is turned on, and charging of the capacitor 15 is started. The capacitor 15 is charged in a time corresponding to the capacitance value C15 and discharged in a time corresponding to the capacitance value C15. Accordingly, the waveform of the dimming signal S in the period Tt during which the timer circuit 13b is on has a dull shape for both rising and falling. The charging time ta until the voltage V at the rise of the dimming signal S is measured by the charging time measuring circuit 25 of the dimming control device 2. The timer circuit 13b is turned off at time t3, and the short circuit state of the dimming signal line L1 is eliminated.

  Next, a case where the timer circuit 14b of the switch device 14 is turned on by the abnormal state detection signal s12 from the time measuring device 12 (FIG. 4B) will be described. The power source of the dimming control device 2 is turned on at time t1, the dimming signal output circuit 24 of the dimming control device 2 outputs a dimming signal S having a predetermined on-duty value at the voltage V, and the fluorescent lamp Fa1 Light is emitted with an output corresponding to the on-duty, and the illuminance sensor 12 detects the illuminance K. At time t2, the time measuring device 12 detects that the lighting time of the fluorescent lamp Fa1 has reached a preset accumulated time, outputs an abnormal state detection signal s12, the timer circuit 14b is turned on, and the capacitor 16 is turned on. Charging starts. The capacitor 16 is charged in a time corresponding to the capacitance value C16 and discharged in a time corresponding to the capacitance value C16. The charging time tb until the voltage V at the rise of the dimming signal S is measured by the charging time measuring circuit 25 of the dimming control device 2. The waveform of the dimming signal S during the period Tt in which the timer circuit 14b is on has a dull shape for both rising and falling, but the area of the waveform does not change, and the illuminance K of the fluorescent lamp Fa1 does not change. The timer circuit 14b is turned off at time t3, and the short circuit state of the dimming signal line L1 is eliminated.

  The on-time Tt of the timer circuits 13b and 14b is set to a time having a width equal to or longer than one cycle Tc of the dimming signal (PWM signal) S. In the present embodiment, the on-time Tt of the timer circuits 13b and 14b has a length that is three times the one cycle Tc of the dimming signal (PWM signal) S. The charging times ta and tb measured by the charging time measuring circuit 25 of the dimming control device 2 are not the time until the voltage of the dimming signal S reaches the voltage V, but the voltage of the dimming signal S is the voltage V. It may be a time until a predetermined reference voltage Vc set to a lower level is reached. Specifically, the charging time measuring circuit 25 of the dimming control device 2 is configured such that the dimming signal S is set to a value lower than the original voltage V of the dimming signal S as shown in FIG. The time t until the voltage Vc is reached may be measured as the charging time.

  Furthermore, the capacitances C15 and C16 of the capacitors 15 and 16 are set in consideration of the reference voltage Vc and the minimum on-duty value of the dimming signal S. Specifically, the capacitances C15 and C16 of the capacitors 15 and 16 can detect the difference between the charging time ta and the charging time tb even when the reference voltage Vc is set to a relatively small value as described above. Even when the on-duty of the dimming signal S is minimized, the charging times ta and tb are set to values that can be detected.

  The fluorescent lamp luminaire Fa is configured as described above. When the illuminance sensor 11 detects that the illuminance is insufficient, the charging time measuring circuit 25 measures the charging time ta and sends the charging time information ta to the microprocessor 23. When the time measuring device 12 detects that the accumulated time has been reached, the charging time measuring circuit 25 measures the charging time tb and outputs the charging time information tb to the microprocessor 23. On the other hand, the storage unit 26 of the dimming control device 2 stores an information table T (FIG. 6) in which the charging time and the contents of the abnormal state are stored in association with each other. The microprocessor 23 stores the information table. Based on T, an abnormal state corresponding to the charging time information ta and tb output from the charging time measurement circuit 25 is determined.

  Then, the microprocessor 23 operates the alarm device 29 according to the determined abnormal state. For example, when the determined abnormal state is insufficient illuminance, the microprocessor 23 turns on a red LED (not shown) of the alarm device 29, and when the determined abnormal state is out of life, the alarm device 29. The blue LED (not shown) is turned on. The user can recognize the type of abnormal state that has occurred in the fluorescent lamp luminaire Fa based on the color of the lit LED. When the alarm device 29 includes a speaker, the type of abnormal state can be output as a different voice message.

  In the present embodiment, the abnormal state detection unit Fa3 has two types of detectors: an illuminance sensor 11 that detects the light output of the fluorescent lamp Fa1, and a time measuring instrument 12 that measures the cumulative lighting time of the fluorescent lamp Fa1. However, for example, it has a human sensor and a timer to measure the lighting time of the luminaire when a person is absent near the luminaire, and the person in the state where the light source is lit is absent. A third type abnormal state detector that outputs an abnormal state detection signal to the switching device Fa4 when it is detected that the time has reached a predetermined time may be provided.

  The above description is about the fluorescent lamp lighting device Fa, but the detection procedure of the abnormal state and the alarm output mode for each abnormal state by the alarm device 29 are incandescent in the illumination dimming control system 1 of the present embodiment. The same applies to the lamp luminaire R and the LED luminaire E (see FIG. 1). The incandescent lamp luminaire R and the LED luminaire E are light sources based on the dimming signal S with respect to the fluorescent lamp luminaire Fa. The difference is that the control method of the incandescent lamp R1, LEDE1) is control by phase angle.

  Hereinafter, the control method of each light source (incandescent lamp R1, LEDE1) will be described along the description of the configuration of the lighting circuit R2 of the incandescent lamp lighting fixture R and the lighting circuit E2 of the LED lighting fixture E. As shown in FIG. 7, the lighting circuit R2 of the incandescent lamp illuminator R has a power supply circuit 42 for converting the voltage, current, etc. of the power supply from the commercial power supply 21 to a predetermined value, and the power supply circuit 42 converts the voltage to a predetermined voltage. A signal conversion unit 43 that converts the output phase angle of the converted power into a value corresponding to the dimming signal S (PWM signal), and the signal conversion unit 43 is input via the dimming signal line L3. The output phase angle is converted according to the on-duty of the dimming signal S to cause the incandescent lamp R1 to emit light with a predetermined output. The switch device R4 is connected to the dimming signal line L3 in the previous stage of the signal conversion unit 43. Specifically, for example, when the PWM signal S having an on-duty value of 98% is input via the dimming signal line L3, the signal conversion unit 43 controls the output phase angle to 178 degrees according to the PWM signal. The incandescent lamp R1 emits light with an output of 2%.

  As shown in FIG. 8, the lighting circuit E <b> 2 of the LED lighting apparatus E converts a power supply voltage, current, etc. from the commercial power supply 21 to a predetermined value, and converts the power supply circuit 52 to a predetermined voltage by the power supply circuit 52. A signal conversion unit 53 that converts the output phase angle of the generated power into a value corresponding to the dimming signal S (PWM signal), and the signal conversion unit 53 is input via the dimming signal line L4. The output phase angle is converted according to the on-duty of the dimming signal S, and the LEDE1 is caused to emit light with a predetermined output. The switch device E4 is connected to the dimming signal line L4 in the previous stage of the signal conversion unit 53.

(Second Embodiment)
Next, an illumination dimming control system 1 according to the second embodiment will be described with reference to FIGS. 9 to 11. The illumination dimming control system 1 according to the second embodiment includes substantially the same hardware configuration as the illumination dimming control system 1 according to the first embodiment, and the difference is an information table stored in the storage unit 26. As shown in FIG. 9, T has an item of charging time (ta + tb) obtained by adding up charging time ta and charging time tb, and the item is stored in association with the abnormal state “insufficient illumination and expired life”. That is, the microprocessor 23 can accurately determine the illuminance shortage and the expiration of life that occur almost simultaneously, and the alarm device 29 can distinguish and output three types of abnormal states.

  Hereinafter, when the detection of insufficient illuminance by the illuminance sensor 11 and the detection of expiration of the life by the time measuring device 12 occur at different timings, the output of an abnormal state detection signal when it occurs at the same timing, the on / off timing of the timer circuit, and The voltage of the dimming signal line and the like will be described with reference to FIGS. 10 and 11, respectively.

  First, the case where the detection of insufficient illuminance and the detection of end of life occur at different timings will be described with reference to FIG. In the following, a case where an abnormal state occurs in the fluorescent lamp lighting device Fa will be described as an example. The power source of the dimming control device 2 is turned on at time t1, the dimming signal output circuit 24 of the dimming control device 2 outputs a dimming signal S having a predetermined on-duty value at the voltage V, and the fluorescent lamp Fa1 Emits light with output according to on-duty. At time t2, the illuminance sensor 11 detects an insufficient illuminance and outputs an abnormal state detection signal s11, the timer circuit 13b is turned on and charging of the capacitor 15 is started, and the charging time measuring circuit 25 measures the charging time ta. To do. Subsequently, at time t3, the time measuring device 12 detects the end of life and outputs an abnormal state detection signal s12, the timer circuit 14b is turned on and charging of the capacitor 16 is started, and the charging time measuring circuit 25 is charged. Time tb is measured. The microprocessor 23 receives the charging time information ta from the charging time measuring circuit 25 at time t2, determines the occurrence of insufficient illuminance corresponding to the charging time ta based on the information table T, and from the charging time measuring circuit 25 at time t3. The charging time information tb is received, and the occurrence of the end of life corresponding to the charging time tb is determined based on the information table T.

  Next, the case where the detection of insufficient illuminance and the detection of the end of life occur at the same timing will be described with reference to FIG. The power source of the dimming control device 2 is turned on at time t1, the dimming signal output circuit 24 of the dimming control device 2 outputs a dimming signal S having a predetermined on-duty value at the voltage V, and the fluorescent lamp Fa1 Emits light with output according to on-duty. At time t2, the illuminance sensor 11 detects an insufficient illuminance and outputs an abnormal state detection signal s11. At the same time t2, the time measuring device 12 detects the end of life and outputs an abnormal state detection signal s12. Accordingly, the timer circuit 13b and the timer circuit 14b are simultaneously turned on, and charging of the capacitor 15 and the capacitor 16 is started simultaneously.

  Since the capacitor 15 and the capacitor 16 connected in parallel to the dimming signal line L1 are charged at the same time, the charging time is the total charging time (ta + tb), and the charging time measuring circuit 25 Information (ta + tb) is output to the microprocessor 23 as information. The microprocessor 23 searches (ta + tb) among the charging times stored in the information table T, and determines that “insufficient illumination and expired life” associated with the charging time (ta + tb) has occurred. Subsequently, the microprocessor 23 turns on an LED (for example, a green LED) indicating the third type of abnormal state of the alarm device 29 to inform the user that two abnormal states of insufficient illuminance and expiration of life have occurred at the same time. To do.

  In the present embodiment, the timer on period Tt of the timer circuits 13b and 14b is one cycle of the dimming signal S in order to distinguish and detect whether the illuminance shortage and the end of life occur at different timings or at the same time. It is set to be the same as the length of Tc.

  As described above, in the illumination dimming control system 1 according to the present invention, the electrostatic fixtures Fa, Fb, R, and E are electrostatically controlled according to the types of abnormal states detected by the abnormal state detectors Fa3, Fb3, R3, and E3. Since the capacitance units 13b and 14b having different capacitance values are charged, the dimming control device 2 determines the type of abnormal state based on the charging times ta, tb, and (ta + tb) measured by the charging time measurement circuit 25. It is possible to correctly determine different types of abnormal states that occur in the lighting fixtures Fa, Fb, R, and E without requiring a simple signal line.

1 is a block diagram showing the overall configuration of an illumination dimming control system according to a first embodiment of the present invention. The block diagram which shows the structure of the fluorescent lamp lighting fixture in the illumination dimming control system. The block diagram which shows the structure of the abnormal condition detection part and switch apparatus of a fluorescent lamp lighting fixture in the same illumination light control system. (A) is the timing which shows the output timing of the abnormal condition detection signal when the lack of illuminance occurs, the on / off timing of the timer circuit, the voltage of the dimming signal line, and the illuminance of the fluorescent lamp in the illumination dimming control system. The chart (b) shows the output timing of the abnormal state detection signal, the on / off timing of the timer circuit, the voltage of the dimming signal line, and the change in illuminance of the fluorescent lamp in the same lighting dimming control system. The timing chart which shows. Explanatory drawing which shows the relationship between the reference electric potential Vc when the capacitor | condenser in the same illumination light control system is charged, and charging time. The figure which shows the information table memorize | stored in the memory | storage part of the dimming control apparatus in the illumination dimming control system. The block diagram which shows the structure of the incandescent lamp lighting fixture in the illumination dimming control system. The block diagram which shows the structure of the LED lighting fixture in the illumination light control system. The figure which shows the information table memorize | stored in the memory | storage part of the dimming control apparatus in the illumination dimming control system which concerns on the 2nd Embodiment of this invention. In the same lighting dimming control system, output timing of abnormal condition detection signal, on / off timing of timer circuit, timing of change in voltage of dimming signal line when illuminance shortage and end of life occur in a short time chart. The timing chart which shows the output timing of the abnormal condition detection signal, the on / off timing of a timer circuit, and the change of the voltage of a dimming signal line when the illuminance shortage and the life expiration occur at the same time in the same lighting dimming control system.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Illumination dimming control system 2 Dimming control apparatus 11 Illuminance sensor (abnormal state detection part)
12-hour measuring instrument (abnormal state detector)
13 Switch device (switch)
14 Switch device (switch)
15 Capacitor (capacitance part)
16 Capacitor (capacitance part)
23 Microprocessor (determination unit)
25 Charging time measuring circuit (charging time measuring unit)
Fa, Fb Fluorescent lamp lighting equipment (lighting equipment)
R Incandescent lighting equipment (lighting equipment)
E LED lighting equipment (lighting equipment)
Fa1 fluorescent lamp (light source)
Fa2 lighting circuit Fa3 abnormal state detection unit Fa4 switch device (switch)
L1, L2, L3, L4 Dimming signal line L1a Short circuit S Dimming signal Vc Voltage s11, s12 Abnormal state detection signal t, ta, tb, ta + tb Charging time

Claims (2)

In a lighting dimming control system comprising a plurality of lighting fixtures including a light source and a lighting circuit, and a dimming control device that transmits a dimming signal to the lighting fixtures via a dimming signal line,
Each of the lighting fixtures is
An abnormal state detector for detecting an abnormal state of each lighting fixture;
A switch for short-circuiting the dimming signal line for a predetermined time by an abnormal state detection signal from the abnormal state detector;
A capacitance unit interposed in a short circuit formed by the switch and having a different capacitance value for each type of abnormal state, and
The dimming control device includes:
A charging time measuring unit that measures a charging time until a potential of the dimming signal becomes a predetermined value when a short circuit is formed by the switch and charging of the capacitor unit is started;
An illumination dimming control system comprising: a determination unit that determines a type of an abnormal state based on the charging time measured by the charging time measurement unit. The determination unit
The illumination dimming according to claim 1, wherein a plurality of types of abnormal states are determined based on a total charging time when charging is performed on a plurality of capacitors having different capacitance values. Control system.

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