JP4325671B2 - Lighting device - Google Patents

Description

  The present invention relates to a lighting device.

  In general, the luminous flux of a lamp used for illumination decreases as the usage time elapses. That is, the illuminance decreases as the lamp usage time elapses. As a technique for suppressing a decrease in illuminance as the lamp usage time elapses, an on / off control terminal 31 and a dimming control terminal 32 are connected to a main operation panel 30 via a signal line 33 as shown in FIG. And what was employ | adopted in the illumination system which controlled the light control lighting fixture 34 which can light-control a lamp with the on-off control terminal 31 and the light control terminal 32 is known (for example, patent) Reference 1). In this lighting system, the dimming lighting fixture 34 has a function of dimming the lamp in response to a dimming signal from the dimming control terminal 32, and the on / off control terminal 31 instructs the on / off of the lamp. That is, in the dimming lighting fixture 34, when the lamp is lit by the on / off control terminal 31, the dimming signal from the dimming control terminal 32 can be received to adjust the light output of the lamp. When the wall switch 35 connected to the signal line 33 is operated, the on / off control terminal 31 and the dimming control terminal 32 are turned on / off according to a command transmitted from the main operation panel 30 via the signal line 33. And control the dimming amount of the lamp. A plurality of dimming lighting fixtures 34 are connected to the on / off control terminal 31 and the dimming control terminal 32. That is, the plurality of dimming / lighting fixtures 34 are collectively controlled by the common on / off control terminal 31 and the dimming control terminal 32. The on / off control terminal 31 is connected to an illumination power source 36 that supplies power for lighting the lamp to the dimming lighting fixture 34.

By the way, in the illumination system described above, an illuminance correction value calculation device 37 is connected to the dimming control terminal 32 as shown in FIG. 19 in order to suppress the change in the luminous flux of the lamp regardless of the lamp usage time. . The illuminance correction value calculating device 37 is timed by a clock means 38 for measuring time, a memory 39 for storing the light flux reduction characteristic of the lamp, a memory 40 for storing the light flux reduction characteristic due to dirt, and the clock means 38. Computation means 41 is provided for adding and outputting the correction values read from the memories 39 and 40 according to time. The dimming control for generating the dimming signal of the dimming amount instructed from the main control panel 30 through the signal line 33 by giving the output of the calculating means 41 to the illuminance correction unit 42 provided in the dimming control terminal 32. The illuminance correction unit 42 corrects the output of the signal generation unit 43. By providing the dimming signal corrected in this way to the dimming lighting fixture 34, a decrease in illuminance over time is suppressed.
JP-A 64-89287

  However, the above-described lighting system requires at least the main control panel 30, the dimming control terminal 32, the dimming lighting fixture 34, and the illuminance correction arithmetic unit 37, and the signal line 33 must be wired. It takes time and initial investment becomes very large.

  Further, in the configuration described above, since a plurality of dimming lighting fixtures 34 are connected to one dimming control terminal 32, any one of these dimming lighting fixtures 34 may have a lamp crack or a lamp. When the lamp is replaced at an early stage due to variations in the characteristics of the lamp, the usage time differs from other lamps, and the illuminance differs from the dimming lighting fixture 34 using the other lamps. . In order to prevent such a difference in illuminance, the lamps of the dimming lighting fixtures 34 controlled by the same dimming control terminal 32 must be exchanged all at once, which increases the cost of lamp replacement.

  Further, the above-described lighting system is assumed to be used in an office or a store, and a plurality of dimming lighting fixtures 34 are connected to one dimming control terminal 32, and lamps are used only when necessary. Instead of lighting, it is thought to be lit continuously at a specific time every day. Therefore, it is difficult to use the lamp in a place where the number of lamps is small (hot water supply room, staircase, restroom, small office, etc.) because the cost increases and the wiring of the signal line 33 is troublesome. . Moreover, since the lamp is continuously lit, the clock means 38 continuously counts whether or not the lamp is used, and in the place as described above where the lamp is lit for a relatively short time. The time measured by the time measuring means 38 does not correctly reflect the usage time of the lamp.

  The present invention has been made in view of the above-mentioned reasons, and its purpose is to suppress the decrease in illuminance with the passage of time of use and, when employed in a place where the number of lamps is small, the construction is easy and the cost is low. An object of the present invention is to provide an illuminating device that is relatively low and that is unlikely to cause a difference in illuminance even when the lamp is replaced alone.

According to the first aspect of the present invention, the discharge lamp, the discharge lamp lighting device capable of lighting the discharge lamp and controlling the power supplied to the discharge lamp, and the power supply time to the discharge lamp lighting device are measured as the discharge lamp lighting time. A lighting time timer and an illuminance correction device for instructing the discharge lamp lighting device to supply power to the discharge lamp according to the lighting time measured by the lighting time timer so as to suppress a decrease in luminous flux with the passage of the lighting time of the discharge lamp. And a means for detecting a no-load state of the discharge lamp while the power to the discharge lamp lighting device is turned on, and a reset control unit for resetting the lighting time timer, the reset control unit comprising a nonvolatile memory has to write the unloaded history indicating the presence or absence of a no-load state in the non-volatile memory, with no-load state when there no load history unloaded state of the nonvolatile memory is not detected, the time of lighting When the lighting time counted by the timer is more than a predetermined time, it is to reset the lighting time timer and no-load history.

According to this configuration, it is possible to correct the luminous flux of the discharge lamp without using a large-scale wiring system including a main control panel and a terminal, and it is possible to significantly reduce the initial investment compared to the conventional configuration. . That is, even in a place where the number of lighting fixtures is small or a user who uses a small number of lighting fixtures, it is possible to use a function of suppressing a decrease in luminous flux with the passage of the discharge lamp lighting time. In addition, since the lighting time is obtained based on the power supply time to the discharge lamp lighting device, the lighting time can be obtained accurately for each individual discharge lamp, and the light flux can be corrected accurately. Even if one of the plurality of discharge lamps is replaced, the light output of the discharge lamp is a substantially constant value controlled by the illuminance correction device, so that the amount of light does not change. In addition, it is possible to prevent forgetting to reset because the lighting time timer is automatically reset by detecting a no-load state associated with replacement of the discharge lamp or the like. Further, since the no-load state is determined with the power supply to the discharge lamp lighting device turned on, when the normal discharge lamp is mounted, the no-load state is eliminated and the discharge lamp can be lit. Further, the lighting device is reset only when the discharge lamp is replaced due to the life of the discharge lamp.

According to a second aspect of the present invention, in the first aspect of the present invention, the circuit board on which the lighting time timer and the illuminance correction device are mounted is provided separately from the circuit board on which the discharge lamp lighting device is mounted.

  According to this configuration, the design is facilitated by mounting the discharge lamp lighting device as the power system and the lighting time timer and the illuminance correction device as the signal system on different circuit boards.

According to a third aspect of the invention, in the first aspect of the invention, the circuit board on which the lighting time timer and the illuminance correction device are mounted is provided integrally with the circuit board on which the discharge lamp lighting device is mounted.

  According to this configuration, the lighting time timer, the illuminance correction device, and the discharge lamp lighting device can be handled as a single member, so that the assembling work into the fixture is easy, and the mounting area can be reduced and the size can be reduced. there is a possibility.

According to a fourth aspect of the present invention, in the first to third aspects of the invention, the discharge lamp lighting device comprises an inverter circuit.

  According to this configuration, it is easy to control the power supplied to the discharge lamp, and the luminance with respect to the power supplied can be increased.

According to a fifth aspect of the present invention, in the first to fourth aspects of the present invention, the illuminance correction device collates the dimming ratio and lighting time instructed from the outside with a correction table and supplies power to the discharge lamp. Is to determine.

  According to this configuration, it is possible to perform light control by an instruction from the outside while suppressing a decrease in luminous flux of the discharge lamp with the passage of lighting time.

According to a sixth aspect of the present invention, in the first to fourth aspects of the invention, the illuminance correction device is instructed from the outside to supply power to the discharge lamp, which is obtained from a luminous flux maintenance ratio of the discharge lamp according to a lighting time. The power supplied to the discharge lamp is determined by correcting with the dimming ratio.
According to this configuration, while suppressing the decrease in luminous flux of the discharge lamp as the lighting time elapses, it is possible to perform dimming according to an instruction from the outside, as well as the luminous flux maintenance ratio according to the lighting time. If this is set, the power supplied to the discharge lamp can be obtained using the dimming ratio according to an instruction from the outside, the data creation work becomes easy, and the capacity for storing data decreases.

  According to this configuration, while suppressing the decrease in luminous flux of the discharge lamp as the lighting time elapses, it is possible to perform dimming according to an instruction from the outside, as well as the luminous flux maintenance ratio according to the lighting time. If this is set, the power supplied to the discharge lamp can be obtained using the dimming ratio according to an instruction from the outside, the data creation work becomes easy, and the capacity for storing data decreases.

According to the configuration of the present invention, the luminous flux of the discharge lamp can be corrected without using a large-scale wiring system equipped with a main control panel and a terminal, so that the number of lighting fixtures and the use of lighting fixtures are small. Even for a small number of users, there is an advantage that it is possible to use a function of suppressing a decrease in luminous flux with the passage of lighting time of the discharge lamp. Moreover, since the lighting time is determined based on the power supply time to the discharge lamp lighting device, the lighting time can be accurately determined for each individual discharge lamp, and the light flux can be accurately corrected. In addition, even if one of the plurality of discharge lamps is replaced, the light output of the discharge lamp is an approximately constant value controlled by the illuminance correction device, so that there is an advantage that the amount of light does not change. In addition, there is an effect that forgetting to reset can be prevented because the lighting time timer is automatically reset by detecting a no-load state associated with the replacement of the discharge lamp. Further, since the no-load state is determined with the power supply to the discharge lamp lighting device turned on, there is an advantage that when the normal discharge lamp is mounted, the no-load state is eliminated and the discharge lamp can be lit. Further, the lighting device is reset only when the discharge lamp is replaced due to the life of the discharge lamp.

(Basic configuration 1)
The illumination device 1 described below basically includes a discharge lamp 11 as a lamp, as shown in FIG. 6, and the discharge lamp 11 is lit by the output of a discharge lamp lighting device 12 capable of dimming control. A lighting time detection unit 13 for detecting whether or not the discharge lamp lighting device 12 is energized is provided between a power source AC such as a commercial power source and the discharge lamp lighting device 12, and is detected by the lighting time detection unit 13. The energization period is counted by the lighting time timer 14. That is, the energization period is regarded as the use period of the discharge lamp 11 and the use time of the discharge lamp 11 is measured by the lighting time timer 14.

  By the way, the luminous flux of the lamp decreases with time of use as shown in FIG. 7A, and the amount of light also decreases when the lamp or the lamp mounted with the lamp becomes dirty over time. The illumination device 1 is provided with an illuminance correction device 15 in order to suppress such a decrease in light amount with the passage of usage time. Here, the decrease in the luminous flux of the discharge lamp 11 is caused by deterioration of the phosphor in the case of a fluorescent lamp. The illuminance correction device 15 is basically configured to correct a decrease in the luminous flux with the passage of time of use of the discharge lamp 11, and immediately after replacement of the discharge lamp 11 as shown in FIG. In this case, the discharge lamp 11 is dimmed and discharged via the discharge lamp lighting device 12 so that the discharge lamp 11 is brought into full lighting (rated lighting) as the usage time of the discharge lamp 11 elapses. The power supplied to the lamp 11 is controlled. That is, the output of the discharge lamp lighting device 12 is increased as the usage time of the discharge lamp 11 elapses. In this way, the luminous flux of the discharge lamp 11 decreases as the usage time elapses, whereas by increasing the power supplied to the discharge lamp 11 as the usage time elapses, FIG. Thus, the light output of the discharge lamp 11 can be kept substantially constant.

  As described above, for example, the discharge lamp 11, the discharge lamp lighting device 12, the lighting time timer 14, and the illuminance correction device 15 are integrally provided in the lighting device 1 provided in the form of a lighting fixture. It is possible to correct the decrease in the luminous flux with the passage of the usage time of the discharge lamp 11 simply by performing the wiring construction to be connected, and the wiring construction can be handled in the same manner as a conventional lighting fixture. In addition, a lighting time detection unit 13 is inserted between the discharge lamp lighting device 12 and the power source AC, and only a period during which the lighting lamp detection unit 13 determines that the discharge lamp 11 is lit is a lighting time timer. 14 is timed, so that a time substantially coincident with the usage time of the discharge lamp 11 is detected by the lighting time timer 14, and the lighting and turning-off of the discharge lamp 11 are repeated in a relatively short time. Even if it is a form, the use time of the discharge lamp 11 can be time-measured correctly.

  The operations described above are summarized as shown in FIG. Here, the lighting time timer 14 has a function of writing the time measured in the nonvolatile memory, and an initial setting process (S2) of the lighting time timer 14 is performed immediately after the power is turned on (S1). In 14, the lighting time (that is, the usage time) written in the nonvolatile memory is read out. When the lighting time is thus set in the lighting time timer 14, the illuminance correction device 15 reads the lighting time from the lighting time timer 14 (S3). Based on the read usage time, a dimming ratio is determined so that a predetermined light output is obtained from the discharge lamp 11 (S4), and a dimming signal corresponding to the dimming ratio is output (S5). The discharge lamp lighting device 12 determines the power supplied to the discharge lamp 11 in accordance with this dimming signal. Next, the lighting time timer 14 measures the lighting time (that is, the usage time) (S6), and stores the lighting time after the clocking in the nonvolatile memory (S7). Thereafter, the reading of the lighting time from the nonvolatile memory, the dimming control, and the writing of the lighting time to the nonvolatile memory are repeated.

  FIG. 9 shows a specific configuration. The discharge lamp lighting device 12 employs an inverter circuit. In other words, a rectifier DB1 made of a diode bridge for full-wave rectification of the power supply AC is provided, and a switching element Q3 made of a MOSFET is connected between the DC output terminals of the rectifier DB1 via the inductor L1. Further, a series circuit of a diode D1 and a smoothing capacitor C1 is connected between both ends of the switching element Q3, and the inverter circuit is driven by using the smoothing capacitor C1 as a power source. The inverter circuit includes a series circuit of a pair of switching elements Q1 and Q2 composed of MOSFETs connected between both ends of the smoothing capacitor C1, and between the both ends of one switching element Q2, a DC cut capacitor C2 and a resonance circuit are provided. A series circuit of the inductor L2 and the discharge lamp 11 is connected. Further, a capacitor C3 constituting a resonance circuit is connected together with the inductor L2 between the non-power supply side ends of both filaments of the discharge lamp 11. Switching elements Q1-Q3 are turned on / off at high frequency by inverter control unit CN1, and switching elements Q1, Q2 are alternately turned on / off. Further, the dimming signal from the illuminance correction device 15 is input to the inverter control unit CN1, and the power supplied to the discharge lamp 11 is adjusted by controlling the on / off cycle (that is, the operating frequency) of the switching elements Q1 and Q2. It is supposed to be.

  The operation of the inverter circuit shown in FIG. 9 is well known, and the output voltage from the rectifier DB1 is boosted by a boosting chopper circuit composed of an inductor L1, a switching element Q3, a diode D1, and a smoothing capacitor C1, and the switching element An alternating current is passed through the discharge lamp 11 by alternately turning on and off Q1 and Q2. Here, since the inductor L2 and the capacitor C3 exist in the power supply path to the discharge lamp 11, depending on the relationship between the ON / OFF cycle (operating frequency) of the switching elements Q1 and Q2 and the resonance frequency by the inductor L2, the capacitor C3, and the like, The energy supplied to the discharge lamp 11 can be adjusted.

  The lighting time detection unit 13 includes a series circuit of resistors R1 and R2 that divides the voltage of the power supply AC, a rectifier DB2 that includes a diode bridge that rectifies the voltage across the resistor R2, and a smoothing capacitor that smoothes the output voltage of the rectifier DB2. C4. That is, the lighting time timer 14 measures the period in which the voltage across the smoothing capacitor C4 is equal to or higher than the specified voltage.

  The illuminance correction device 15 is constituted by a microcomputer together with a lighting time timer 14. This microcomputer is provided with a nonvolatile memory 17 which is an EEPROM that reads and writes the time measured by the lighting time timer 14 and stores a correction table used in the illuminance correction device 15. The correction table is a table in which the usage time of the discharge lamp 11 is associated with the dimming ratio for correction, and the use timed by the lighting time timer 14 in the dimming ratio setting unit 18 provided in the illuminance correction device 15. By reading the dimming ratio from the nonvolatile memory 17 using time, the dimming ratio for keeping the light output of the discharge lamp 11 substantially constant can be determined. The dimming ratio determined by the dimming ratio setting unit 18 is given to the dimming signal generation unit 19, and a dimming signal to be given to the inverter control unit CN1 is generated. Here, the power of the lighting time timer 14, the dimming ratio setting unit 18, and the dimming signal generation unit 19 is supplied from a three-terminal regulator RG1 that makes the voltage across the smoothing capacitor C4 constant.

  Thus, when the power source AC is turned on and the voltage across the smoothing capacitor C4 reaches the specified voltage, the lighting time timer 14 performs the initial setting process described above and reads the use time of the discharge lamp 11 from the nonvolatile memory 17 until the previous time. Then, this usage time is given to the dimming ratio setting unit 18. The dimming ratio setting unit 18 checks the usage time against the correction table stored in the nonvolatile memory 17 and reads the dimming ratio corresponding to the usage time. The dimming ratio read in this way is given to the dimming signal generation unit 19, and the output of the inverter circuit is controlled. Further, the lighting time timer 14 counts the usage time, and stores the time after timing in the nonvolatile memory 17. Thereafter, during the period in which the power source AC is supplied, the operation from reading the usage time to the nonvolatile memory 17 and writing the new usage time to the nonvolatile memory 17 is repeated, and the discharge lamp 11 is supplied according to the usage time. The power supply is adjusted.

  Various forms can be adopted for the dimming signal given from the dimming signal generation unit 19 to the inverter control unit CN1, and here, the dimming ratio is represented by the duty ratio of a rectangular wave signal having a frequency of 1 kHz and an amplitude of 5V. Although it is assumed that a signal is used, it is also possible to use a dimming signal that gives a dimming ratio with a DC voltage of 0 to 10 V, for example. Here, it is assumed that the dimming signal has a luminous flux ratio of the discharge lamp 11 with respect to the duty ratio (ratio of luminous flux when the rated power is given as 100%) as shown in FIG. . That is, the output of the discharge lamp lighting device 12 is set to increase as the ON period of the dimming signal is shorter.

  A specific setting example of the correction table is shown. In a fluorescent lamp generally used for illumination as the discharge lamp 11, it is known that the luminous flux at the end of the lifetime decreases to about 70% when the luminous flux at the beginning of the lifetime (immediately after the replacement of the lamp) is 100%. That is, if the output of the discharge lamp lighting device 12 is set to about 70% of the rated output at the beginning of the life and the output is increased to 100% at the end of the life, the light output of the discharge lamp 11 is set regardless of the usage time. It is thought that it can be kept substantially constant. Further, if such control is performed, it is not necessary to set the output of the discharge lamp lighting device 12 to 110% or more with respect to the rated output, and the power consumption can be suppressed at the beginning of the life, thereby saving energy.

  Accordingly, when the output of the discharge lamp lighting device 12 is set to 70% of the rated output and the transition with the elapsed time of the luminous flux of the discharge lamp 11 is shown in FIG. 11A, the luminous flux at 12000 hours is about 60%. And a decrease of about 9.8% from the initial life. Therefore, when the output of the discharge lamp lighting device 12 is increased by the decrease of the luminous flux with the passage of time as shown in FIG. 11B, the luminous flux of the discharge lamp 11 is substantially constant regardless of the elapsed time (that is, the usage time). It is kept in. Here, in order to control the output of the discharge lamp lighting device 12 as shown in FIG. 11B, the duty ratio corresponding to the luminous flux ratio in each time of FIG. 11B is obtained by the relationship shown in FIG. The dimming ratio corresponding to the duty ratio obtained at each time may be stored in the nonvolatile memory 17 as a correction table.

  In the illustrated example, when the lighting time is 0 hours, 4000 hours, 8000 hours, 12000 hours, and 16000 hours, the luminous flux ratio, the luminous flux reduction rate, the output ratio of the discharge lamp lighting device 12, and the duty ratio of the dimming signal Is as shown in Table 1.

  The relationship between the lighting time and the duty ratio shown in Table 1 is stored in the nonvolatile memory 17 as a correction table, and the duty ratio is read in accordance with the lighting time measured by the lighting time timer 14 to discharge the lamp. 11, the light output can be kept substantially constant (about 70% of the rated output) regardless of the lighting time, as shown in FIG.

  In the above configuration example, the lighting device 1 is a single lighting fixture, and the unit U1 (see FIG. 9) including the discharge lamp lighting device 12, the lighting time detection unit 13, the lighting time timer 14, and the illuminance correction device 15 are provided. Although it divides | segments into the unit U2 with which it equips and it mounts on two circuit boards and is integrated in the illuminating device 1, you may combine both into one unit. If they are combined into one unit, they can be mounted on one circuit board, and a connection line for connecting the dimming signal generation unit 19 and the inverter control unit CN1 becomes unnecessary. Compared with the case where two units U1 and U2 are provided, the number of circuit boards is reduced, and the space for the lighting device (lighting fixture) 1 can be saved. Or facilitating assembly. The above-described configuration example of the discharge lamp lighting device 12 is an example, and other configurations can be used as long as the dimming control is possible.

(Basic configuration 2)
By the way, when a dimming function is added to the configuration described above, the configuration shown in FIG. 13 is obtained. That is, it is possible to give an instruction according to the dimming signal from the outside through the dimming signal detection unit 21 to the dimming ratio setting unit 18. The difference between this configuration and the configuration shown in the basic configuration 1 will be described.

  The configuration shown in FIG. 13 includes a nonpolarizing circuit DB3 composed of a diode bridge to which an external dimming signal (external dimming signal) is input. The output of the nonpolarizing circuit DB3 is insulated by a photocoupler PC1 and has a resistance. The light is input to the dimming signal detector 21 through a filter including R4, R5 and a capacitor C5. The external dimming signal is a rectangular wave signal having a frequency of 1 kHz and an amplitude of 5 V, similar to the dimming signal generated by the dimming signal generation unit 19, and uses a signal representing the dimming ratio by the duty ratio. . Therefore, a voltage corresponding to the dimming ratio is input to the dimming signal detection unit 21. Since the dimming ratio setting unit 18 needs to obtain the dimming ratio for the combination of the lighting time read from the nonvolatile memory 17 and the dimming ratio based on the external dimming signal input through the dimming signal detection unit 21, As shown in FIG. 14, after the lighting time is read from the non-volatile memory 17 in the lighting time timer 14 (S3), the dimming signal given through the dimming signal detector 21 is read (S4). The correction table in the nonvolatile memory 17 is read to determine the dimming ratio (S5). Other procedures are the same as those shown in FIG. In FIG. 13, a part surrounded by a broken line indicates a part mounted on one circuit board.

  Thus, when the output of the discharge lamp lighting device 12 is 85%, 80%, and 70% of the rated output, the transition with the elapsed time of the luminous flux of the discharge lamp 11 is shown in FIG. 15 (a). Become. On the other hand, when the duty ratio of the dimming signal given to the discharge lamp lighting device 12 is changed as shown in FIG. 15 (b), the dimming ratio indicated by the external dimming signal regardless of the lighting time. It becomes possible to obtain a substantially constant light output. That is, the luminous flux ratio, the output ratio of the discharge lamp lighting device 12 and the duty ratio of the dimming signal when the lighting time is 0 hours, 4000 hours, 8000 hours, 12000 hours, and 16000 hours are as shown in Table 2. become. The values in parentheses in Table 2 indicate the dimming ratio indicated by the external dimming signal.

  Therefore, the relationship between the lighting time shown in Table 2 and the dimming ratio indicated by the external dimming signal and the duty ratio is stored as a correction table in the nonvolatile memory 17 and timed by the lighting time timer 14. By reading the duty ratio in accordance with the lighting time and the external dimming signal and giving it to the discharge lamp lighting device 11, the light output with respect to the dimming ratio given by the external dimming signal can be kept substantially constant regardless of the lighting time. It can be done. Other configurations and operations of the basic configuration 2 are the same as those of the basic configuration 1.

(Basic configuration 3)
In the basic configuration 2, the duty ratio is read from the nonvolatile memory 17 and supplied to the dimming signal generation unit 19. However, the luminous flux maintenance ratio is read from the non-volatile memory 17, and the dimming ratio is set by the dimming ratio setting unit 18. May be calculated. However, also in this case, a configuration in which the optical output is controlled by the external dimming signal is adopted.

  In this case, the nonvolatile memory 17 stores the relationship between the lighting time and the luminous flux maintenance ratio in Table 3 as a correction table, and the dimming ratio setting unit 18 is nonvolatile according to the lighting time obtained by the lighting time timer 14. The lighting maintenance ratio is read from the memory 17.

  Here, the luminous flux maintenance ratio is the remaining ratio of luminous flux after a predetermined time when the luminous flux at the time of rated lighting at the beginning of the life of the discharge lamp 11 is taken as 100%. is there. In other words, the luminous flux ratio when the lapse of 4000 hours after the replacement of the discharge lamp 11 is 91%, and the luminous flux maintenance ratio becomes 0.91. Assuming that the light control ratio of the external light control signal is set to 80% after the lapse of 4000 hours, the actual light control ratio after the lapse of 4000 hours is the illuminance after the lapse of 4000 hours. It is the one to which the increase of the dimming ratio by correction is added. Here, the increment of the dimming ratio due to the illuminance correction after the lapse of 4000 hours is a value obtained by multiplying the dimming maintenance ratio after 4000 hours by the dimming ratio by the external dimming signal, and (1-0 .91) × 80% = 7.2%. In other words, the dimming ratio is 80% + 7.2% = 87.2% (see Table 3). Thus, if the dimming ratio by the external dimming signal is 80% when the lighting time is 4000 hours, the dimming ratio given to the discharge lamp lighting device 12 is 87.2%. When the dimming ratio is given by the duty ratio as in the basic configuration 1 and the basic configuration 2 described above, the duty ratio becomes 25.6% by using the relationship shown in FIG.

  As described above, the dimming ratio setting unit 18 reads the luminous flux maintenance ratio from the non-volatile memory 17 and uses it together with the dimming ratio given by the external dimming signal to perform the above-described calculation to obtain the dimming ratio. Further, the dimming ratio is converted into a duty ratio and given to the dimming signal generator 19. Here, by storing the duty ratio corresponding to the dimming ratio in the non-volatile memory 17 as well, conversion from the dimming ratio to the duty ratio can be performed by collating with the table.

  The above operations are summarized as shown in FIG. That is, after the power is turned on (S1) and the initial setting process of the lighting time timer 14 is performed (S2), the lighting time is read from the lighting time timer 14 in the dimming ratio setting unit 18 (S3). Thereafter, the luminous flux maintenance factor corresponding to the lighting time is read from the nonvolatile memory 17 (S4), and the dimming ratio based on the external dimming signal is also read into the dimming ratio setting unit 18 (S5). Thus, the above-described calculation is performed based on the luminous flux maintenance factor and the dimming ratio based on the external dimming signal, and the dimming ratio is determined (S6). After determining the dimming ratio, the dimming ratio is converted into a duty ratio, and a dimming signal corresponding to the dimming ratio is output from the dimming signal generation unit 19 (S7). The discharge lamp lighting device 12 determines the power supplied to the discharge lamp 11 in accordance with this dimming signal. Next, the lighting time timer 14 measures the lighting time (S8), and stores the lighting time after the clocking in the nonvolatile memory (S9). Thereafter, the reading of the lighting time from the nonvolatile memory, the dimming control, and the writing of the lighting time to the nonvolatile memory are repeated.

  In FIG. 17 (a), the transition of the output with the passage of lighting time of the discharge lamp lighting device 12 is given by the external dimming signal as the output ratio (the output of the discharge lamp lighting device 12 with respect to the rated lighting at the beginning of the life is set to 100%). FIG. 17B shows the transition of the dimming ratio of the dimming signal given to the discharge lamp lighting device 12.

  Below, the technique which detects the replacement time of the discharge lamp 11 and resets lighting time automatically is demonstrated. That is, since the lighting time set in the lighting time timer 14 and the lighting time stored in the non-volatile memory 17 need to be reset to 0 when the discharge lamp 11 is replaced, the lighting time is automatically reset. It is necessary to detect the replacement time of the discharge lamp 11 by some method.

( Basic configuration 4 )
As a configuration for automatically resetting the lighting time of the lighting time timer 14 and the non-volatile memory 17, it is conceivable to perform the detection by detecting the Emires state. In the present invention, however, the lighting time is based on the no-load state of the discharge lamp 11. Adopt technology to reset. That is, as shown in FIG. 1, in addition to the basic configuration 1, a transformer T1 having a primary winding inserted between the discharge lamp 11 and the switching element Q2 is provided, and the secondary output of the transformer T1 is rectified by the rectifier DB4. The voltage proportional to the current flowing through the discharge lamp 11 can be detected as the voltage across the capacitor C6 by smoothing it later with the capacitor C6. In this configuration, since the secondary output of the transformer T1 cannot be obtained in the no-load state, the voltage across the capacitor C6 is lower than when the load is normal. A no-load state is detected by detecting such a change in the voltage across the capacitor C6.

  The voltage across the capacitor C6 is input to the inverter control unit CN1 and the reset control unit 22, and the inverter control unit CN1 stops the operation of the discharge lamp lighting device 12 when it is determined that there is no load due to a decrease in the voltage across the capacitor C6. Further, the reset control unit 22 resets the lighting time of the lighting time timer 14 and the lighting time stored in the nonvolatile memory 17 when the voltage across the capacitor C6 falls below the reference value. Therefore, if the discharge lamp 11 is replaced while the power is turned on, when the discharge lamp 11 is removed, the no-load state is entered and the lighting time is reset. In this configuration, since the lighting time can be reset if the discharge lamp 11 is replaced regardless of whether it is in the Emires state or not, when the discharge lamp 11 is cracked, the discharge lamp 11 is automatically replaced. It becomes possible to reset.

  The operation of the configuration shown in FIG. 1 is summarized as shown in FIG. That is, after the initial setting process (S2), the presence / absence of a no-load state is detected (S3), and when the no-load state is not detected, the operation is the same as in the basic configuration 1. On the other hand, when a no-load state is detected, a process for resetting the lighting time is performed as a replacement of the discharge lamp 11 (S9). That is, until the discharge lamp 11 is replaced, the lighting time is reset by detecting the no-load state, and when the discharge lamp 11 is replaced and the lamp is lit normally, the lighting time is started. In this way, since the lighting time is automatically reset with the replacement of the discharge lamp 11, the trouble of resetting the lighting time can be saved.

  By the way, if the discharge lamp 11 is removed and the no-load state continues, the no-load determination is made in step S3 and the lighting time is reset. Therefore, the lighting time is repeatedly reset. When the normal discharge lamp 11 is mounted, the no-load state is eliminated. Therefore, the process proceeds from step S3 to step S4, the dimming ratio is set, and the discharge lamp 11 can be turned on. Here, the inverter control unit CN1 has a function of lighting the discharge lamp 11 when the normal discharge lamp 11 is mounted. In the configuration shown in FIG. 1, since the lighting time is automatically reset by attaching and detaching the discharge lamp 11, there is no forgetting to reset and it is possible to save the trouble of resetting operation. Other configurations and operations are the same as those of the basic configuration 1, and can be applied to the basic configuration 2 and the basic configuration 3.

( Embodiment 1 )
In the above configuration example, the lighting time is reset when the no-load state is detected. Therefore, the lighting time is repeatedly reset until the no-load state is resolved. On the other hand, when the no-load state is detected, the lighting time can be reset only once. In this configuration, the operation of the reset control unit 22 is different from the basic configuration 4 , but the other configurations are the same as the basic configuration 4 .

That is, as shown in FIG. 3, when a no-load state is detected (S3), the reset control unit 22 is provided with a function (S10) in which the no-load history is set to “present” and written in the non-volatile memory 17. Keep the no-load history “Yes” while the state continues. During the period when the no-load state is detected, the process (S4) of reading the no-load history written in the nonvolatile memory 17 is not performed, and the detection of the no-load state and the control for the no-load state are repeated. Here, if the discharge lamp 11 in the no-load state is replaced, the no-load state is not detected in step S3, so the no-load history is read from the nonvolatile memory 17 (S4) and before the discharge lamp 11 is mounted. If the no-load state continues, the no-load history is “present”, so the lighting time and no-load history are reset (S11). Thus, in this example, while the no-load state continues, the no-load history is only written in the nonvolatile memory 17 and the lighting time is not reset, and the lighting time after the normal discharge lamp 11 is mounted. Is supposed to reset. Note that the lighting time reset by detecting the no-load state may be performed only after 12000 hours in the case of the current discharge lamp 11. In this way, the lighting device is reset only when the discharge lamp 11 is replaced due to the lifetime. Other configurations and operations are the same as those of the basic configuration 4 .

(Reference example)
In the basic configuration 4 , the lighting time is reset when the no-load state of the discharge lamp 11 is detected while the power supply AC is turned on. However, in the present embodiment, the discharge lamp 11 is turned on during the period when the power supply AC is not turned on. It also resets the lighting time when is removed. In order to detect the attachment / detachment of the discharge lamp 11 during the period when the power supply AC is not turned on, as shown in FIG. 4, in the present embodiment, in addition to the basic configuration 4 shown in FIG. A series circuit of resistors R6 and R7, a switch element SW1 and a DC power supply E1 is connected between both ends of the filament to which the primary winding is connected, and a diode D2 and a DC power supply E2 are connected between the output terminals of the three-terminal regulator RG1. And a power supply from the DC power source E2 to the microcomputer (portion surrounded by a broken line in FIG. 4) via the switch element SW2. It is desirable that the DC power sources E1 and E2 use secondary batteries and be charged while the power of the DC power sources E1 and E2 is not used, and can be used without charging for about 10 days.

  The switch elements SW1 and SW2 are controlled by the inverter control unit CN1, and are controlled so that both switch elements SW1 and SW2 are turned on when the power source AC is not turned on. That is, when the power source AC is not turned on, the current from the DC power source E1 flows through the filaments of the discharge lamp 11 via the resistors R6 and R7, and the potential at the connection point between the resistor R7 and the filament is reset. Input to the unit 22 and the inverter control unit CN1. In addition, the microcomputer including the lighting time timer 14, the dimming ratio setting unit 18, the dimming signal generation unit 19, and the reset control unit 22 is supplied with power from the DC power supply E2 and is not supplied with the power AC. Is working. Here, the diode D2 is for backflow prevention.

  With the above configuration, if the discharge lamp 11 is connected even when the power supply AC is not turned on, a voltage higher than the reference value is applied to the reset control unit 22 by the DC power supply E1, and the power supply from the DC power supply E2 is applied. With the supply, the reset control unit 22 can monitor the connection state of the discharge lamp 11. Here, when the discharge lamp 11 is removed, the current from the DC power source E1 does not flow through the resistors R6 and R7, and the input voltage to the reset control unit 22 decreases. Therefore, the reset control unit 22 resets the lighting time.

Therefore, in this embodiment, as shown in FIG. 5, when it is notified by the decrease in the input voltage to the reset control unit 22 that there is no load (S3), whether or not the power supply AC is turned on is determined. Regardless, the lighting time is reset (S10). If no load condition is detected, it is determined whether or not the power supply AC is turned on (S4). If the power supply AC is turned on, the same processing as in the basic configuration 4 is performed, and the power supply AC is turned on. Otherwise, only the monitoring of the no-load state is performed without measuring the lighting time or determining the dimming ratio according to the lighting time. In the present embodiment, even if the discharge lamp 11 is replaced when the power supply AC is not turned on, the reset control unit 22 only stops resetting the lighting time, and does not light the discharge lamp 11. If the power supply AC is turned on after replacing the electric lamp 11 with a normal one, the no-load state is not detected in step S3, and the discharge lamp 11 can be lit normally. In the present embodiment, similarly to the basic configuration 4 , since the lighting time is automatically reset by attaching and detaching the discharge lamp 11, there is no forgetting to reset, and the labor of resetting operation can be saved. Other configurations and operations are the same as those of the basic configuration 4 .

  In the above-described configuration, when the discharge lamp 11 is replaced, if the lighting time is more than 12000 hours in the current discharge lamp 11, the lamp is lit when the lighting time reaches 12000 hours. It is desirable to provide a monitor lamp as a guide for replacing the discharge lamp 11.

  In the configuration described above, the period from the reading of the lighting time until the lighting time is stored is not particularly described, but this period can be set as appropriate. Since this period only needs to be a level that can correct a decrease in luminous flux with the passage of the lighting time of the discharge lamp 11, it may be a relatively long period, for example, one hour. However, it is necessary to shorten this cycle in a place where the interval between lighting and extinguishing of the discharge lamp 11 is short. Conversely, if the discharge lamp 11 is continuously lit, the cycle can be set to 100 hours or the like. is there.

6 is a circuit diagram showing a basic configuration 4. FIG. It is operation | movement explanatory drawing same as the above. FIG. 3 is an operation explanatory diagram illustrating the first embodiment . It is a circuit diagram which shows a reference example. It is operation | movement explanatory drawing same as the above. 2 is a block diagram showing a basic configuration 1. FIG. It is operation | movement explanatory drawing same as the above. It is operation | movement explanatory drawing same as the above. It is a circuit diagram which shows the specific circuit same as the above. It is operation | movement explanatory drawing same as the above. It is operation | movement explanatory drawing same as the above. It is operation | movement explanatory drawing same as the above. 3 is a circuit diagram showing a basic configuration 2. FIG. It is operation | movement explanatory drawing same as the above. It is operation | movement explanatory drawing same as the above. FIG. 10 is an operation explanatory diagram showing a basic configuration 3; It is operation | movement explanatory drawing same as the above. It is a block diagram which shows a prior art example. It is a principal part block diagram of a prior art example.

Explanation of symbols

1 Lighting equipment (lighting equipment)
DESCRIPTION OF SYMBOLS 11 Discharge lamp 12 Discharge lamp lighting device 14 Lighting time timer 15 Illuminance correction device 17 Non-volatile memory (correction-like table)
22 reset control unit C2 capacitor C3 capacitor C6 capacitor DB4 rectifier L2 inductor Q1, Q2 switching element T1 transformer U1, U2 unit

Claims (6)

A discharge lamp, a discharge lamp lighting device capable of lighting the discharge lamp and controlling power supplied to the discharge lamp, a lighting time timer for measuring a power feeding time to the discharge lamp lighting device as a lighting time of the discharge lamp, and a discharge lamp To an illuminance correction device for instructing the discharge lamp lighting device to supply power to the discharge lamp according to the lighting time measured by the lighting time timer so as to suppress a decrease in luminous flux with the passage of the lighting time of the lamp, and to the discharge lamp lighting device Means for detecting the no-load state of the discharge lamp while the power is on, and a reset control unit for resetting the lighting time timer, the reset control unit has a non-volatile memory, and is in an unloaded state writes unloaded history showing the presence or absence of the non-volatile memory, with no load history in the nonvolatile memory is unloaded state when there unloaded condition is not detected, measured by the lighting time timer Lighting device lighting time that is in the case of a predetermined time or more, characterized in that resetting the lighting time timer and no-load history. 2. The lighting device according to claim 1, wherein a circuit board on which the lighting time timer and the illuminance correction device are mounted is provided separately from the circuit board on which the discharge lamp lighting device is mounted. The lighting device according to claim 1, wherein a circuit board on which the lighting time timer and the illuminance correction device are mounted is provided integrally with a circuit board on which the discharge lamp lighting device is mounted. The lighting device according to any one of claims 1 to 3, wherein the discharge lamp lighting device includes an inverter circuit. 5. The illuminance correction device according to claim 1, wherein the power supply to the discharge lamp is determined by comparing the dimming ratio and the lighting time instructed from the outside with a correction table. The lighting device according to item 1. The illuminance correction device determines the supply power to the discharge lamp by correcting the supply power to the discharge lamp obtained from the luminous flux maintenance ratio of the discharge lamp according to the lighting time with the dimming ratio instructed from the outside. The lighting device according to any one of claims 1 to 4, wherein

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