JP3933185B2 - 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 with the passage of lamp usage time, 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 is instructed to turn on / off 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. 18 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. It is relatively low, and even if the lamp is replaced alone, the difference in illuminance is unlikely to occur. In addition, the lighting time can be reset at any timing, and an operation target for resetting must be provided separately. It is an object of the present invention to provide a lighting device having a simple configuration.

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. Lighting time timer and 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 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, and the on / off of the power by the power switch for turning on / off the power is the prescribed procedure. when the provided reset controller for resetting the lighting time timer, the reset control unit to oN, oFF, and oN after turning off in less than 3 seconds after turning on the power switch It resets the lighting time timer operations as the prescribed procedure, the power switch even after three seconds after turning on the power switch unless not turn off, it is determined that the power switch is continuously turned on Is.

According to this configuration, it is possible to correct the luminous flux of the discharge lamp without the need for a large-scale wiring system equipped with a main control panel and terminals, and the initial investment can be greatly reduced compared to the conventional configuration. it can. 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, the lighting time timer can be arbitrarily reset, and since the power switch is also used for resetting, the number of objects to be operated does not increase and the configuration is simple. Furthermore, since the lighting time timer, the illuminance correction device, and the discharge lamp lighting device can be handled as a single member, it is easy to incorporate into the fixture, and there is a possibility that the mounting area can be reduced and the size can be reduced. .

According to a second aspect of the present invention, in the first aspect 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 third aspect of the present invention, in the first or second aspect 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 fourth aspect of the present invention, in the first or second aspect of the present invention, the illuminance correction device is instructed from 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 the configuration of the present invention, the luminous flux of the discharge lamp can be corrected without the need for a large-scale wiring system including a main control panel and a terminal, so that the number of lighting fixtures and the location of the lighting fixture can be reduced. There is an advantage that even a user with a small number of units can use a function of suppressing a decrease in luminous flux with the passage of the lighting time of the discharge lamp. 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 accurately obtained for each individual discharge lamp, and the light flux can be corrected accurately. There is an advantage. 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. Further, the lighting time timer can be arbitrarily reset, and the power switch is also used for resetting, so that there is an advantage that the number of objects to be operated does not increase and the configuration is simple.

(Basic configuration 1)
As shown in FIG. 5, the illuminating device 1 basically includes a discharge lamp 11 as a lamp, 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. 6 (a), and the amount of light also decreases when the lamp or 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 the 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, but by increasing the power supplied to the discharge lamp 11 as the usage time elapses, as shown in FIG. In addition, 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 operation is 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. 8 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. 8 is well known, and the output voltage from the rectifier DB1 is boosted by a boost 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. 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, in the dimming signal, the luminous flux ratio of the discharge lamp 11 with respect to the duty ratio (ratio of luminous flux when the rated luminous energy is given as 100%) is set 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. 10A, 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. 10B, 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. 10B, the duty ratio corresponding to the luminous flux ratio at each time of FIG. 10B 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. 8) 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, and the cost is reduced by reducing the number of components (boards and housings). 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)
As shown in FIG. 12, a dimming function may be added to the basic configuration 1. That is, it may be possible to give an instruction according to an external dimming signal through the dimming signal detection unit 21 to the dimming ratio setting unit 18. Differences from the configuration shown in FIG. 8 will be described.

  The configuration shown in FIG. 12 includes a nonpolarizing circuit DB3 formed of a diode bridge to which an external dimming signal (external dimming signal) is input, and 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. 13, 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. 12, 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% with respect to the rated output, the transition with the elapsed time of the luminous flux of the discharge lamp 11 is shown in FIG. 14 (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. 14B, 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 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, this configuration also employs a configuration in which the optical output is controlled by an external dimming signal.

  The relationship between the lighting time and the luminous flux maintenance ratio in Table 3 is stored in the nonvolatile memory 17 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 the 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%, and represents the luminous flux ratio as a ratio instead of a percentage. is there. That is, the luminous flux ratio when the lapse of 4000 hours after the replacement of the discharge lamp 11 is 91%, 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 other configuration examples 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, thereby performing the above 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 operation is 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. 16A, the transition of the output with the lapse 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. 16B shows the transition of the dimming ratio of the dimming signal given to the discharge lamp lighting device 12. Other configurations and operations are the same as those of the basic configuration 1.

(Embodiment)
Incidentally, the lighting time set in the lighting time timer 14 and the lighting time stored in the nonvolatile memory 17 need to be reset to 0 when the discharge lamp 11 is replaced. Although it is possible to automate the resetting of the lighting time by detecting the replacement of the discharge lamp 11, in this embodiment, a configuration in which the lighting time is reset manually will be described. That is, in the basic configuration 1, the lighting time of the lighting time timer 14 and the nonvolatile memory 17 can be reset using the power switch SW. As shown in FIG. 1, the lighting time is reset when the power switch SW inserted between the power source AC and the rectifier DB1 is operated in a specific method.

  Specifically, the output voltage of the rectifier DB1 is divided by the resistors R8 and R9, and the rectangular wave signal obtained by shaping the voltage across the resistor R9 using the resistors R10 and R11 and the transistor Q4 is input to the reset control unit 22, The reset control unit 22 counts the number of rectangular wave signals, and determines whether or not to reset the lighting time based on the counted value. That is, as shown in FIG. 2, since the reset control unit 22 determines whether or not to reset the lighting time when the power is turned on, this process is referred to as a power supply reset process (S1). If the power switch SW is also used for resetting the lighting time in this way, the lighting time can be reset without providing a separate reset switch SW3.

  Hereinafter, the power supply reset process will be described in more detail. The power source AC is a commercial power source. In the region where the frequency of the power source AC is 60 Hz, the output frequency of the rectifier DB1 is 120 Hz, and in the region where the frequency of the power source AC is 50 Hz, the output frequency of the rectifier DB1 is 100 Hz. Therefore, 120 or 100 rectangular wave signals are input to the reset control unit 22 per second. That is, if the power switch SW is turned on and off in a short time, the on period and the off period of the power switch SW can be known from the number of rectangular wave signals. Therefore, in this embodiment, when the power is turned on, as shown in FIG. 3, it is determined that the lighting time reset is instructed when the power is turned on after 2 seconds on, 2 seconds off, 2 seconds on, 2 seconds off. The reset control unit 22 is configured to reset the lighting time of the lighting time timer 14 and the nonvolatile memory 17. FIG. 3A shows power on / off by operating the power switch SW, and FIG. 3B shows a rectangular wave signal input to the reset control unit 22.

  In the power reset process, as shown in FIG. 4, when the power is turned on (S1), the counter N for counting the number of times the power switch SW is turned on / off is reset (S2), and the number of rectangular wave signals is counted for 3 seconds (S3). ). If the power switch SW does not turn off even after 3 seconds have elapsed (S4), it is determined that the power switch SW has been continuously turned on, and the process proceeds to reading of the lighting time (S2) in FIG. Here, the operation for instructing the reset is on for 2 seconds from turning on the power, but the power switch SW is set to 3 seconds for a margin because it is operated by a person. In this way, the time determination is set in consideration of an error caused by a human operation. If the power is off at the time of 3 seconds after the power is turned on (S4), if the number of rectangular wave signals input to the reset control unit 22 from this time is in the range of 180 to 300, it is regarded as off 2 seconds ( S5). However, the power supply AC is used in an area where the frequency is 60 Hz. If the OFF period of the power switch SW is not within the range set in step S5, the operation for instructing reset is invalid. After step S5, a time limit by the timer of the reset control unit 22 is started (S6), and it is determined whether the power switch SW is on (S7). Here, if the power switch SW is not turned on, the operation for instructing the reset is invalid. If the power switch SW is on, the counter N is incremented when the count value by the timer is in the range of 1.8 to 2.2 seconds (S8). That is, it is determined whether or not it is ON 2 seconds. If ON 2 seconds is satisfied, it is determined that the first reset operation (ON 2 seconds, OFF 2 seconds, ON 2 seconds) is successful. Thereafter, the power switch SW is kept off for 3 seconds, and the determination as to whether the power switch SW is on is between 1.8 and 2.2 seconds is repeated again. If the counter N reaches 2 (S9) Then, the lighting time of the lighting time timer 14 and the nonvolatile memory 17 is reset (S10). At this time, the counter N, the timer for measuring the OFF time of the power switch SW, and the count value of the number of rectangular wave signals are simultaneously reset to zero.

  Since the lighting time can be reset by turning the power switch SW on and off as described above, it is not necessary to provide a reset switch for resetting the lighting time, and the configuration is simplified. In particular, when a large number of discharge lamps 11 are provided, a large number of reset switches are required. However, in the configuration of this embodiment, the configuration is simplified because the wire switch SW is also used for resetting. Other configurations and operations are the same as those of the basic configuration 1.

  According to this configuration, the lighting time is forcibly reset not only when the discharge lamp 11 is replaced, but also when the discharge lamp 11 is replaced before the end of its life due to cracking of the discharge lamp 11 or an initial failure of the discharge lamp 11. be able to.

  Note that the discharge lamp 11 is often replaced after the current discharge lamp 11 has exceeded 12000 hours. Therefore, a monitor lamp that is turned on when the lighting time reaches 12000 hours is provided. Thus, it is desirable to use it as a guide for replacing the discharge lamp 11.

  Further, in the above-described configuration example, 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 sufficient to correct the decrease in the luminous flux with the passage of the lighting time of the discharge lamp 11, it may be a relatively long period, for example, 1 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. Each of the above-described embodiments has been described based on the basic configuration 1, but it goes without saying that the configuration may be configured based on the basic configuration 2 and the basic configuration 3.

It is a circuit diagram which shows embodiment of this invention. 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. 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 22 Reset control part SW Power switch

Claims (4)

A discharge lamp, a discharge lamp lighting device capable of turning on 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 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 A circuit board on which the timer and illuminance correction device are mounted is provided integrally with the circuit board on which the discharge lamp lighting device is mounted, and the lighting time timer is reset when the power on / off using the power switch that turns the power on / off is a prescribed procedure a reset control unit is provided, the reset control unit is turned on after turning off in less than 3 seconds after turning on the power switch off, the defining hand operation to turn on Resets the lighting time timer as, if not the power switch power switch even after 3 seconds after switching on is turned off, characterized in that it is determined that the power switch is continuously turned on Lighting device. The lighting device according to claim 1, wherein the discharge lamp lighting device includes an inverter circuit . 3. The illumination according to claim 1, wherein the illuminance correction device determines the power supplied to the discharge lamp by comparing the dimming ratio and the lighting time instructed from outside with a correction table. apparatus. 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. claim 1 or claim 2 lighting equipment according to said.

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