JP2006100048A - Discharge lamp lighting device, lighting apparatus, and lighting system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a discharge lamp lighting device which carries out the initial correction of illumination intensity, detecting an electric trouble in a discharge lamp without increasing the cost of the device, and to provide a lighting apparatus equipped with the discharge lamp lighting device and the discharge lamp, and a lighting system controlling a plurality of the apparatuses. <P>SOLUTION: The discharge lamp lighting device comprises an inductance 3 of which one terminal is connected to an output terminal of an invertor 2, at least one balancer 4 of which one terminal is connected to the other end of the inductance 3, a first capacitor 5 of which one terminal is connected to the other end of the balancer 4, a plurality of series circuits of discharge lamps 6, second capacitors 7 connected in parallel with the respective discharge lamps 6, a dimmer controller 8 which adjusts the light flux of the discharge lamp right after lighting to a predetermined light flux, a detection circuit 9 which is connected to the discharge lamp 6 to detect its electrical abnormal state, and a control circuit 10 which controls the discharge lamp in response to signals from the detection circuit. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a discharge lamp lighting device for lighting a discharge lamp, an illumination device including the discharge lamp lighting device and the discharge lamp, and an illumination system for controlling a plurality of illumination devices.

  As shown in FIG. 8 (a), the luminous flux of a discharge lamp (for example, a fluorescent lamp) that is generally used as an illumination application decreases as the cumulative lighting time of the discharge lamp elapses. It is known to do. For this reason, if the output of the discharge lamp lighting device that supplies power to the discharge lamp is kept constant regardless of the elapsed cumulative lighting time, the discharge lamp will end at the end of the life of the discharge lamp or after the rated life time of several thousand hours. The illuminance will decrease. Such a decrease in luminous flux due to changes over time is particularly noticeable in facilities and stores that have a plurality of discharge lamps such as large-scale offices, because the luminous flux of all discharge lamps decreases almost uniformly. May be felt.

  Therefore, even after the discharge lamp has been lit for several thousand hours, the discharge lamp has the same luminous flux as the initial luminous flux immediately after replacement, as shown in FIG. In some cases, dimming control is performed to increase the output of the discharge lamp lighting device so that the luminous flux of the light increases with time. By such control, as shown in FIG. 8C, the luminous flux of the discharge lamp can be made substantially constant regardless of the cumulative lighting time. And setting the initial luminous flux of the discharge lamp in consideration of the cumulative lighting time of the discharge lamp in this way is sometimes referred to as initial illuminance correction.

  Here, for example, a balancer as described in Japanese Patent Application Laid-Open No. 11-238589 is used as a discharge lamp lighting device that performs dimming control on each discharge lamp while suppressing variations in luminous flux among a plurality of discharge lamps. There is a discharge lamp lighting device.

  In this discharge lamp lighting device, as shown in FIG. 9, the capacitor of the second resonance circuit J8 and the discharge lamps J41 and J42 are connected in series to both ends of the capacitor JC2. That is, the load circuit J40 including a series circuit such as the discharge lamps J41 and J42 is connected to the output terminal of the inverter unit 2 via the capacitor and the first resonance circuit J3. Further, the oscillation frequency of the inverter unit J2 is determined by the oscillation control unit J5. The second resonant circuit J8 reduces the difference in light output between the discharge lamps by connecting the plurality of discharge lamps J41 of the load circuit J40 so that the currents flowing through the discharge lamps are equal. Yes.

Further, in the balancer dimming system as in the above-mentioned conventional example, normally, from the viewpoint of sufficiently ensuring a preheating current even at the time of deep dimming such as a dimming ratio of 30% or less and a dimming ratio of 150% or more. As shown in FIG. 10 of Japanese Patent No. 238589, a preheating circuit is provided separately from the second resonance circuit J8 and the like. That is, a preheating circuit using a so-called preheating winding using the secondary winding of the choke coil JCH of the resonance circuit J3 is separately provided.
JP-A-11-238589 (FIGS. 1 and 10)

However, when dimming control is performed on the discharge lamp by correcting the initial illuminance, the decrease in the luminous flux due to the decrease in the luminous flux is at most about 60%. For example, the dimming ratio is 30% or less or 150%. It is not necessary to perform deep control such as the dimming ratio of several percent or less as described above, or dimming control for production use, and dimming control from about 60% to about 70% or about 130% is possible. It is enough if possible. If only such a shallow dimming ratio is required, separately providing a preheating circuit with a preheating winding causes an increase in the cost of the entire discharge lamp lighting device. Further, in the balancer dimming method, when an abnormal electric state such as Emires occurs in the discharge lamp, it may be difficult to detect the abnormal electric state of the discharge lamp.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a discharge lamp lighting device that performs initial illuminance correction without causing an increase in the cost of the discharge lamp lighting device. Disclosed is a discharge lamp lighting device that can detect an electrical abnormal state of the lamp, a lighting device including the discharge lamp lighting device and a discharge lamp, and a lighting system that controls a plurality of the lighting devices. .

  The discharge lamp lighting device according to claim 1 is connected to a DC power source, converts the DC voltage into a high-frequency voltage, an inductance having one end connected to the output end of the inverter unit, and one end other than the inductance. A balancer connected to one end, a plurality of series circuits of a first capacitor and a discharge lamp, one end of which is connected to the other end of the balancer, a second capacitor connected in parallel to each discharge lamp, and a discharge lamp A measurement timer that measures the cumulative lighting time of the lamp, and a first control circuit that receives a signal corresponding to the cumulative lighting time from the measurement timer and controls at least the inverter unit, and the cumulative lighting time of the discharge lamp is approximately In the zero state, control of the inverter unit is not performed, and at least in the state where the cumulative lighting time of the discharge lamp has reached approximately the rated life time, the luminous flux of the discharge lamp is accumulated in the discharge lamp. As lighting time is substantially equal to the luminous flux in a state of substantially zero, and performs control of the inverter unit.

  The discharge lamp lighting device according to claim 2 is connected to a DC power source, converts the DC voltage into a high frequency voltage, an inductance having one end connected to the output end of the inverter unit, and one end other than the inductance. A balancer connected to one end, a plurality of series circuits of a first capacitor and a discharge lamp, one end of which is connected to the other end of the balancer, a second capacitor connected in parallel to each discharge lamp, and at least an inverter A state in which the cumulative lighting time of the discharge lamp has substantially reached the rated life time, and a data table for storing data correlating with a decrease in luminous flux due to a change with time of the discharge lamp When the luminous flux of the discharge lamp is set to the dimming lower limit and the cumulative lighting time of the discharge lamp does not reach the rated life time, the second control circuit refers to the data table. Te, and correcting the light beam.

  A discharge lamp lighting device according to claim 3 is the discharge lamp lighting device according to claim 1 or 2, wherein the discharge lamp lighting device is connected to one end of the discharge lamp and detects an electrical abnormal state of the discharge lamp; And a third control circuit that receives the signal of the circuit and controls the output of the discharge lamp lighting device.

  A lighting device according to claim 4 is a discharge lamp lighting device according to any one of claims 1 to 3, a main body on which the discharge lamp lighting device is mounted, and a discharge lamp to which electric power is supplied from the discharge lamp lighting device. And.

  According to a fifth aspect of the present invention, there is provided a lighting system comprising a plurality of the lighting device according to the fourth aspect and a control device that controls the lighting device.

  Note that in this specification, when referring to a connection mode of an electrical component such as an inductor or a capacitor, the term “connected” refers to a conductive material that may include an additional component between two or more electrical components. It is assumed that a road exists. For example, when one end of the inductance is connected to one end of the capacitor, even if another electrical component not directly related to the effect of the present invention is connected between the inductance and the capacitor, one end of the inductance is connected to the capacitor. It is assumed that it is connected to one end.

  Further, in this specification, the term “DC power supply” may be unidirectional, and may be, for example, a pulsating power supply after a commercial AC power supply is smoothed by a smoothing capacitor, or a smoothing capacitor. A chopper circuit may be further provided in the subsequent stage. Of course, it may be one that does not pulsate like a battery. In short, all power sources that are not negative with respect to changes over time are included.

  Furthermore, in the present specification, the term “inverter unit” means that a DC voltage from a DC power source is converted into a different high-frequency voltage (a voltage having a constant period of about 20 kHz to about 200 kHz), Means anything. For example, the “inverter unit” may be an arbitrary inverter such as a half bridge type inverter, a full bridge type, a single stone type, a parallel type, or a push-pull type.

  Furthermore, in this specification, the term “discharge lamp” refers to a fluorescent lamp for general illumination, a germicidal lamp, a fluorescent lamp for color illumination, a bulb-type fluorescent lamp, a hot cathode fluorescent lamp, a cold cathode fluorescent lamp. It is assumed that all light emitting means that emit light due to a discharge phenomenon are included. The shape may also be a straight pipe type mainly used for facilities and stores, a ring type mainly used for houses, or a compact type mainly used for downlight fixtures.

  The number of discharge lamps can be any number of three or more if one or more choke coils constituting the balancer are used in a tree shape. As in this case, the number of discharge lamps is Multiple lights may be used.

  Further, in the present specification, the term “electrical abnormal state of the discharge lamp” means a half-wave discharge state (Emiless state) caused by exhaustion of the emitter applied to the filament at the end of the life of the discharge lamp, Abnormal discharge state caused by deformation of one or both of the filaments, abnormal discharge state caused by leakage of rare gas sealed in the discharge lamp, abnormalities caused by poor contact between the discharge lamp and the discharge lamp lighting device By means of these phenomena, including the discharge state, it means a state in which electrical characteristics such as the current flowing through the discharge lamp have a value different from the normal lighting state.

  The deviation of the electrical characteristic value in the electrical abnormal state of the discharge lamp is not limited to the voltage applied to both ends of the discharge lamp, the current flowing through the discharge lamp, or the power consumption of the discharge lamp, but also the light emission of the discharge lamp. This includes efficiency (lumens per watt), discharge lamp illuminance, color temperature, brightness, luminous flux, luminous intensity, input current to the discharge lamp lighting device, input power, etc. Reflected in wall temperature or base temperature. In addition, it is indirectly reflected in the current flowing through each electrical component constituting the discharge lamp lighting device, the voltage applied to both ends of each electrical component, and the like. In short, any characteristic is included as long as the characteristic is different from the normal lighting state of the discharge lamp.

  Further, in this specification, the term “controls the inverter unit” means that the discharge lamp is substantially turned off or the power supplied to the discharge lamp is increased or decreased by changing the operating frequency of the inverter unit. In addition, the control includes dimming or intermittent oscillation of the discharge lamp.

  Furthermore, in this specification, the term “rated life time” refers to the cumulative lighting time until the total luminous flux of the discharge lamp falls to approximately 60% of the initial luminous flux. This rated life time is determined by the type of the discharge lamp. For example, it is approximately 12000 hours for FHF32 and FLR40S and FL40S, which are straight tube fluorescent lamps, and approximately 8500 hours for FHF16. Further, it takes about 6000 hours with EF10, EF16, and EF20, which are light bulb-type fluorescent lamps.

  As described above, in the discharge lamp lighting device according to claim 1, when the cumulative lighting time of the discharge lamp is substantially zero, the inverter unit is not controlled, and at least the cumulative lighting time of the discharge lamp is approximately the rated life time. In the reached state, the inverter unit is controlled so that the luminous flux of the discharge lamp becomes substantially equal to the luminous flux when the cumulative lighting time of the discharge lamp is substantially zero. Even in a zero state, that is, in a state in which the luminous flux of the discharge lamp has not decreased, or in a state in which the cumulative lighting time of the discharge lamp has reached approximately the rated life time, that is, in a state in which the luminous flux of the discharge lamp has decreased, the discharge lamp Can be maintained substantially constant.

  In the discharge lamp lighting device according to claim 2, the luminous flux of the discharge lamp in a state where the cumulative lighting time of the discharge lamp has substantially reached the rated lifetime is set as the dimming lower limit, and the cumulative lighting time of the discharge lamp is substantially rated. When the lifetime is not reached, the second control circuit refers to the data table to correct the luminous flux, so that the dimming ratio of the discharge lamp can always be set to a predetermined value. In addition, when the cumulative lighting time of the discharge lamp has reached approximately the rated life time, the dimming ratio of the discharge lamp should be maintained at a predetermined value by using luminous flux reduction without controlling the inverter unit. Can do.

  Furthermore, in the discharge lamp lighting device according to claim 3, in the discharge lamp lighting device according to claim 1 or 2, the detection circuit is connected to one end of the discharge lamp and detects an electrical abnormal state of the discharge lamp. And a second control circuit that controls the output of the discharge lamp lighting device in response to a signal from the detection circuit, so that even in the balancer dimming method, the electrical abnormal state of the discharge lamp can be accurately detected. Can be detected.

Example 1
Hereinafter, a first embodiment of the present invention will be described with reference to FIGS. FIG. 1 shows a circuit diagram of the present embodiment, and FIG. 2 shows a plan view of the lighting device. FIG. 3 is a plan view of the lighting device.

  Hereinafter, the configuration of each unit will be described.

  The DC power source 1 is composed of a boost chopper circuit having an AC power source AC, a rectifier circuit DB, a switching element Q1, a diode D1, and an inductor L1.

  The AC power supply AC is a commercial AC power supply, and the voltage is, for example, 100V, 200V, or 240V.

  The rectifier circuit DB rectifies an AC voltage from the AC power supply AC into a pulsating voltage and outputs the pulsating voltage, and is constituted by a diode bridge, for example. When the voltage of the AC power supply AC is 100 V, for example, a voltage doubler rectifier circuit may be used instead of the diode bridge. When the voltage doubler rectifier circuit is used, the voltage of the AC power supply AC can be regarded as substantially equal to 200 V, and the current flowing through the circuit connected after the voltage doubler rectifier circuit is about half that when using the diode bridge. Therefore, the efficiency of the discharge lamp lighting device can be increased.

  The step-up chopper circuit having the switching element Q1, the diode D1, and the inductor L1 converts the pulsating voltage from the rectifier circuit DB into another voltage Vdc. Since the operation of this circuit is well known, description of the operation is omitted. Here, the step-up chopper circuit may be a step-down chopper circuit, a step-up / step-down chopper circuit, a circuit in which a step-up chopper circuit and a step-down chopper circuit are connected in series, or the like. In short, any circuit configuration may be used as long as it converts one DC voltage into another DC voltage.

  In the present embodiment, the switching element driving unit 11 that controls the inverter unit 2 drives the switching element Q1 at the same time. Of course, as a circuit that drives only the switching element Q1, for example, an integration made by Motorola The circuit MC34261 may be used. When such an integrated circuit is used, the operating frequency of the switching element Q1 can be driven and controlled simply by setting the value of an external resistor or capacitor, and the DC voltage Vdc can be stepped up or down. Of course, this type of voltage conversion circuit immediately after the rectifier circuit DB may be omitted as appropriate.

  The capacitor C1, which is a smoothing circuit, smoothes the DC voltage Vdc, and is composed of, for example, an electrolytic capacitor. The DC voltage Vdc becomes the input voltage of the inverter unit 2 connected to the subsequent stage of the capacitor C1.

  The inverter unit 2 having a series circuit of the switching elements Q2 and Q3 converts the DC voltage Vdc into a high frequency voltage, and is connected to the output terminal of the DC power source 1. The switching element Q2 and the switching element Q3 are connected in parallel to the capacitor C1, and alternately perform on / off operations. Here, the switching elements Q2 and Q3 are composed of field effect transistors. The field effect transistor includes a diode in parallel between the source and the drain so that the drain of the field effect transistor is connected to the cathode of the built-in diode. Therefore, it is not necessary to attach a diode separately. Of course, a transistor may be used as the switching element, and the cathode of the diode may be connected to the collector in parallel between the emitter and collector of the transistor.

  In addition, the switching element driving unit 11 drives the switching elements Q2 and Q3. That is, the switching element driving unit 11 also drives the switching element Q1 as described above. As such a switching element driving unit 11, for example, an integrated circuit MCZ series manufactured by Shindengen Electric Industry may be used. Further, as an element that drives only the switching elements Q2 and Q3, for example, an integrated circuit M63991FP manufactured by Mitsubishi Electric Corporation may be used. When such an integrated circuit is used, the operating frequencies of the switching elements Q2 and Q3 can be changed as appropriate simply by changing the constants of resistors and capacitors externally attached to the integrated circuit.

  The inductor L2 limits the current flowing through the discharge lamps LA1 and LA2. One end of the inductor L2 is connected to a connection point between the switching element Q2 and the switching element Q3, which is the output end of the inverter, and the other end is a balancer BA. It is connected to the. The balancer BA corrects a current imbalance that is likely to occur between the currents flowing through the discharge lamps LA1 and LA2 when the discharge lamps LA1 and LA2 are dimmed, and keeps the currents flowing through the discharge lamps LA1 and LA2 substantially equal. Is. One end of the balancer BA is connected to the output end of the inductance L2, and the other end is connected to a plurality of series circuits of the first capacitors C2A and C2B and the discharge lamps LA1 and LA2.

  The first capacitors C2A and C2B block a direct current flowing through the discharge lamps LA1 and LA2, and form a resonance circuit with the inductor L2 and second capacitors C3A and C3B described later. The capacitors C2A and C2B have one end connected to the output end of the balancer BA and the other end connected to the discharge lamps LA1 and LA2, respectively. The discharge lamps LA1 and LA2 serve as light sources of the present discharge lamp lighting device, and one end is connected to the output terminals of the first capacitors C2A and C2B and the other end is connected to the circuit ground. The second capacitors C3A and C3B form a resonance circuit with the inductor L2 and also form a preheating circuit. The second capacitors C3A and C3B are connected in parallel to the discharge lamps LA1 and LA2, respectively, and are set smaller than the capacities of the first capacitors C2A and C2B.

  The first control circuit 4a transmits at least a control signal for controlling the operating frequency of the switching elements Q2 and Q3 to the switching element driving unit 11 to control at least the inverter unit 2. The first control circuit 4a also transmits a control signal for controlling the operating frequency of the switching element Q1 to the switching element driving unit 11, and also controls the boost chopper circuit having the switching element Q1, the diode D1, and the inductor L1. ing. The first control circuit 4a includes a microcomputer as a main component, and further includes a measurement timer 3, a nonvolatile memory 17 such as an EEPROM.

  The measurement timer 3 measures the cumulative lighting time of the discharge lamps LA1 and LA2, and includes a series circuit of resistors R1 and R2 that divides the voltage of the AC power supply AC, and a rectifier circuit that full-wave rectifies the voltage across the resistor R2. In a circuit composed of DB2 and a smoothing capacitor C4 that smoothes the output voltage of the rectifier DB2, the cumulative lighting time is measured during a period in which the voltage across the smoothing capacitor C4 is equal to or higher than a specified voltage.

  The measurement timer 3 has a function of writing the measured time in the nonvolatile memory 17, and the initialization process of the measurement timer 3 is performed immediately after the AC power supply AC is turned on. The cumulative lighting time written in is read out. In addition, the first control circuit 4a receives a signal corresponding to the cumulative lighting time from the measurement timer 3, and sends a control signal for controlling the operating frequency of the switching elements Q2 and Q3 to the switching element driving unit 11 therein. Send.

  Next, the operation of the present embodiment will be described.

  Now, let us consider a state where the discharge lamps LA1 and LA2 are continuously lit for a predetermined time and are once extinguished. When the AC power supply AC is turned on again from this state, immediately after that, the initialization process of the measurement timer 3 is performed, and the accumulated lighting time written in the nonvolatile memory 17 is read out to the measurement timer 3.

  Further, when the AC power supply AC is turned on, the voltage across the smoothing capacitor C4 becomes equal to or higher than a specified voltage, and the measurement timer 3 uses the accumulated lighting time read from the nonvolatile memory 17 as an initial value, and the discharge lamp LA1. The measurement of the lighting time of LA2 is started.

  Next, the measurement timer 3 transmits a signal to the dimming ratio setting unit 18 so as to obtain a predetermined light output from the discharge lamps LA1 and LA2 based on the read accumulated lighting time, and the dimming ratio setting unit 18 , The dimming ratio is set. When the dimming ratio is set in the dimming ratio setting unit 18, a dimming ratio setting signal is transmitted to the dimming signal generation unit 19, and a dimming signal corresponding to the dimming ratio is output. And according to this light control signal, a discharge lamp lighting device determines the electric power supplied to discharge lamp LA1, LA2. The measurement timer 3 measures the accumulated lighting time and stores the accumulated lighting time after measurement in the nonvolatile memory 17. Thereafter, the reading of the lighting time from the nonvolatile memory 17, the dimming control, and the writing of the lighting time to the nonvolatile memory 17 are repeated.

  The dimming ratio is 60% to 70% due to the state in which the cumulative lighting time is substantially equal to the rated life time stored in the first control circuit 4a in advance, that is, the light flux of the discharge lamps LA1 and LA2. In a state where it has fallen to the extent, the first control circuit 4a controls the switching element drive unit 11 to lower the operating frequency of the switching elements Q2 and Q3 (therefore, the power supplied to the discharge lamps LA1 and LA2 is The control signal is transmitted so that the luminous fluxes of the discharge lamps LA1 and LA2 are substantially equal to the luminous fluxes when the cumulative lighting times of the discharge lamps LA1 and LA2 are substantially zero.

Here, as a reflection of the circuit efficiency of the discharge lamp lighting device 8, there is a constant preheating current flowing through the capacitors C3A and C3B when the discharge lamps LA1 and LA2 are normally lit. This constant preheating current is

Capacitor C3A (or C3B) capacity × 2π × switching elements Q2 and Q3 operating frequency × discharge lamp LA1 (or LA2) voltage (1)

Given in. In the present embodiment, when the discharge lamps LA1 and LA2 reach the rated life time, the luminous flux is increased by approximately 30% so that the cumulative lighting time is substantially equal to the luminous flux in a substantially zero state. That is, the operating frequency of switching elements Q2 and Q3 is set to, for example, about 55 kHz to 50 kHz. As the operating frequency changes, the voltage of the discharge lamp LA1 (or LA2) decreases due to the negative resistance of the discharge lamp, so that the circuit efficiency of the discharge lamp lighting device 8 increases as can be seen from equation (1). It will be. Moreover, since the operating frequency is only lowered by several kHz, the operation of the discharge lamp lighting device 8 does not enter the phase advance mode.

  That is, with a simple circuit configuration such as so-called C preheating using the capacitor C3A (or C3B), it is possible to correct the light flux decline of the discharge lamps LA1 and LA2 without deteriorating the circuit efficiency of the discharge lamp lighting device 8. . In addition, since the balancer configuration is used, the light outputs of both discharge lamps can be made substantially uniform without causing variations in the currents flowing through the discharge lamps LA1 and LA2.

  In addition, when the cumulative lighting time of the discharge lamps LA1 and LA2 is substantially zero, there is no particular decrease in the luminous flux due to the contamination of the discharge lamps LA1 and LA2 over time or the deterioration of the phosphor or filament. The power consumption of the discharge lamp lighting device 8 is suppressed, and an energy saving effect can be achieved.

  Of course, instead of performing control to increase the luminous flux only when the discharge lamps LA1 and LA2 reach the rated life time, the cumulative lighting time reaches a predetermined time, for example, 2000 hours, 4000 hours,. Sometimes, the luminous flux may be increased by approximately 10%, 20%,. By performing such control, the luminous fluxes of the discharge lamps LA1 and LA2 can be kept substantially constant regardless of the cumulative lighting time.

  In addition, as shown in FIG. 2, the lighting device includes the above-described discharge lamp lighting device 8, the main body 9 on which the discharge lamp lighting device 8 is mounted, and the discharge lamps LA1 and LA2 to which power is supplied from the discharge lamp lighting device. 10 is configured. The main body 9 represents a so-called Fuji lighting device for two lights. S1 is a socket in which the discharge lamp LA1 is mounted, and R is a white reflector disposed on the side facing the discharge lamps LA1 and LA2.

  Furthermore, since discharge lamps such as FHF32, FLR40S and FL40S have the same tube length of 1198 mm and the same base size of the G13 type, they can be shared by one type of lighting device. Accordingly, the user can use the discharge lamp without worrying about the type of the discharge lamp, and can select the discharge lamp according to the user's preference such as the discharge lamp cost, the design, and the light output.

  Moreover, as shown in FIG. 3, the illumination system is comprised from the several illuminating device 10 mentioned above and the control apparatus S which controls these illuminating devices 10. As shown in FIG. In the present embodiment, each lighting device 10 includes a human body detection sensor, and the control device S collectively controls, for example, 12 human body detection sensors and light beams from the lighting devices A to L according to a program. The FHF 32 is mounted as a discharge lamp from the lighting devices A to I, and the FLR 40/36 having a lower luminous flux than the FHF 32 but lower in cost is mounted from the lighting devices J to L on the window side where external light enters.

  As a feature of the control device S, a discharge lamp is turned on when a person is detected by a human body sensor, and is turned off when a person is absent, an input of a discharge lamp mounting state, lighting of an arbitrary lighting device, and setting of a turn-off condition Therefore, it is possible to realize a highly efficient and energy-saving lighting system according to the installation environment.

(Example 2)
The second embodiment of the present invention will be described below with reference to FIG. FIG. 4 shows a block diagram of the second control circuit 4b of the present embodiment. Here, the same components as those in the first embodiment are denoted by the same reference numerals, and description thereof is omitted.

  In the present embodiment, the second control circuit 4b is a data table that stores data correlated with the light beam decline due to the change over time of the discharge lamp, instead of the nonvolatile memory 17 of the first embodiment. A memory 20 is provided. That is, the memory 20 stores data on the light beam decrease for each cumulative lighting time of the discharge lamp LA1 and the like. However, data on light flux decline in the vicinity of the approximate rated life time is not stored. When the cumulative lighting time is in the vicinity of the rated life time, the dimming ratio is automatically about 60% without the control due to the decrease of the luminous flux. In this embodiment, this characteristic is used.

  In other words, in large-scale offices where the number of lamps is large, there is a separate desk stand at each desk, so the main lighting installed on the ceiling surface does not require much illuminance. In some cases, it is not necessary to turn on the discharge lamp at a light ratio of 100%. Even in places where the number of lamps is small, such as hot water supply rooms, stairs, restrooms, small offices, etc., the main lighting is turned on at a dimming ratio of 100%, especially during the day when the sun is out. It may not be necessary. In such a case, the main illumination may be used by constantly adjusting the dimming ratio to about 60%.

  Here, as shown in FIG. 8 (a), the luminous flux of the discharge lamp decreases with the lapse of the cumulative lighting time of the discharge lamp. Until the dimming ratio of the discharge lamp reaches 60%, the second control circuit 4b shown in FIG. 4 controls the inverter unit 2 so that the dimming ratio is always about 60% for every lighting time of the discharge lamp. To control. Then, when the cumulative lighting time is approximately in the vicinity of the rated life time, the second control circuit 4b uses the light flux reduction without controlling the inverter unit 2. If data in the vicinity of the rated life time is omitted in this way, a small capacity can be used as the capacity of the memory 20, and the cost of the discharge lamp lighting device can be reduced.

  In particular, for example, when the cumulative lighting time is 2000 hours and the luminous flux decline is 10% so that the dimming ratio is always approximately 60%, the memory 20 stores data for further reducing the luminous flux by 30%, thereby dimming the discharge lamp. The ratio is set to approximately 60%, and when the cumulative lighting time is 4000 hours and the luminous flux decrease is 20%, data for further reducing the luminous flux by 20% is stored in the memory 20 so that the dimming ratio of the discharge lamp is approximately 60%. If the dimming data for only the cumulative lighting time at predetermined intervals is stored in the memory 20 as described above, the dimming data to be stored can be reduced, and the capacity of the memory 20 can be greatly reduced.

  Note that operations and effects that are not particularly mentioned in the present embodiment are the same as those in the first embodiment.

(Example 3)
Hereinafter, a third embodiment of the present invention will be described with reference to FIGS. 5 to 7 show a configuration in which a detection circuit for detecting an electrical abnormal state of the discharge lamp is added in the first or second embodiment. Here, the same components as those in the first embodiment are denoted by the same reference numerals, and description thereof is omitted.

  The detection circuit 7 in FIG. 5 is connected to one end of the discharge lamp LA1 via a capacitor C2A. In addition, when the discharge lamps LA1 and LA2 are in an abnormal state, the switching element driving unit 11 as the third control circuit 4c controls the output of the discharge lamp lighting device in response to the abnormality detection signal of the detection circuit 7. ing.

  The detection circuit 7 includes resistors R6 and R7 connected to one ends of capacitors C2A and C2B, a circuit that detects a voltage that reflects a voltage increase when the discharge lamp LA1 is abnormal, a reference voltage Vref (1), and a comparator. A circuit that is configured of CP1 and that detects a voltage that reflects a voltage increase at the time of abnormality of the discharge lamp LA1 further includes resistors R11 and R12, a diode D11, and a capacitor C11. When the voltage of the capacitor C11 exceeds the reference voltage Vref (1), the comparator CP1 is turned on, and an abnormality detection signal is output to the switching element driving unit 11.

  In the present embodiment as described above, when at least one of the discharge lamps LA1 or LA2 is in an abnormal state such as Emires and the impedance of the discharge lamps LA1 and LA2 is unbalanced, the capacitor C2A or C2B is connected to the balancer BA. In addition, the detection circuit 7 can detect the voltage rise of the discharge lamp LA1 or LA2 and control the output of the discharge lamp lighting device. Thereby, the electrical stress concerning each electronic component which comprises a discharge lamp lighting device can be reduced.

  Further, when the capacitor C2A side of the discharge lamp LA1 and the capacitor C3B side of the discharge lamp LA2 or the capacitor C3A side of the discharge lamp LA1 and the capacitor C2B side of the discharge lamp LA2 are substantially in the Emilis state, that is, the discharge lamp is in the Emires direction. 5 are opposite to each other, the voltage at the connection point between the balancer BA and the capacitor C2A and / or the connection point between the balancer BA and the capacitor C2B is unlikely to rise, and the detection circuit 7 shown in FIG. May be difficult to detect. Therefore, in the detection circuit shown in FIG. 6, the detection circuit 7 is also connected to the connection point between the discharge lamp LA1 and the capacitor C2A and the connection point between the discharge lamp LA2 and the capacitor C2B to increase the detection accuracy of the Emires state. ing.

  Furthermore, when the dimming ratio of the discharge lamps LA1 and LA2 is deep, when the discharge lamps are in opposite directions as described above, the detection circuit shown in FIG. It may be difficult. That is, the voltage rise at the connection point between the discharge lamp LA1 and the capacitor C2A and the connection point between the discharge lamp LA2 and the capacitor C2B in the Emires state is lower than when the dimming ratio is shallow, and the discharge lamp LA1 and the capacitor C2A The voltage increase degree at the connection point of the balancer BA and the capacitor C2A becomes the voltage increase degree at the connection point of the balancer BA. Therefore, in the detection circuit shown in FIG. 7, the voltages at both ends of the capacitors C2A and C2B are separately detected, and the values from the respective reference voltages Vref (1) to Vref (4) are, for example, the reference voltage Vref. (1)> reference voltage Vref (3) and reference voltage Vref (2)> reference voltage Vref (4).

  As a result, it is possible to accurately detect various Emileless states such as one-lamp one-side Emires, one-lamp both-side Emires, two-lamp one-side Emires, and two-lamp one-side Emires.

  Further, in the present embodiment, capacitors C2A and C2B are connected in series with discharge lamps LA1 and LA2, respectively, and capacitors C3A and C3B are connected in parallel with each other, but when the capacitance values of these capacitors vary In this case, even when the currents flowing through both windings of the balancer BA are equal, the currents flowing through the discharge lamps LA1 and LA2 may not be equal. In such a case, all the values from the reference voltages Vref (1) to Vref (4) are set to different values and input to the inverting input terminals (+) of the comparators from the comparators CP1 to CP4. It is also possible to detect a subtle difference in the applied voltage and cope with various Emires states.

  Further, although not shown, an impedance such as a resistor may be provided between the discharge lamps LA1 and / or LA2 and the circuit ground, and a current flowing through the impedance and a voltage applied to the impedance may be detected.

  As described above, according to the present embodiment, when the impedance of the discharge lamps LA1 and LA2 becomes unbalanced due to Emires or the like, the capacitors C2A and / or C2B can reduce the DC component to the balancer BA. Detecting DC voltage components superimposed on the discharge lamps LA1 and LA2 with high accuracy even when the DC voltage components are difficult to appear on the balancer BA, such as when the discharge lamps are in opposite directions. Can do.

  Note that operations and effects that are not particularly mentioned in the present embodiment are the same as those in the first embodiment.

1 is a circuit diagram showing a discharge lamp lighting device according to a first embodiment. It is a top view which shows an illuminating device. It is a top view which shows an illumination system. FIG. 10 is a block diagram showing a second control circuit in the second embodiment. In 3rd Embodiment, it is a circuit diagram which shows a detection circuit. FIG. 10 is another circuit diagram showing a detection circuit in the third embodiment. FIG. 10 is still another circuit diagram showing a detection circuit in the third embodiment. It is a characteristic figure which shows the light beam decline of the discharge lamp by a time-dependent change. It is a circuit diagram which shows the discharge lamp lighting device which concerns on a prior art example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 DC power supply 2 Inverter part L2 Inductance BA Balancer C2A, C2B 1st capacitor | condenser LA1, LA2 Discharge lamp C3A, C3B 2nd capacitor | condenser 3 Measurement timer 4a 1st control circuit 4b 2nd control circuit 4c 3rd control circuit 20 Data table (memory)
5 Light flux measurement means 6 Correction means 7 Detection circuit 8 Discharge lamp lighting device 9 Main body 10 Illumination device

Claims (5)

An inverter unit connected to a DC power source and converting the DC voltage into a high frequency voltage, an inductance having one end connected to the output end of the inverter unit, a balancer having one end connected to the other end of the inductance, and one end of the balancer A first capacitor connected to the other end and a plurality of series circuits of discharge lamps, a second capacitor connected in parallel to each discharge lamp, a measurement timer for measuring the cumulative lighting time of the discharge lamp, and a measurement A first control circuit that receives at least a signal corresponding to the cumulative lighting time from the timer and controls at least the inverter unit, and controls the inverter unit when the cumulative lighting time of the discharge lamp is substantially zero. At least when the cumulative lighting time of the discharge lamp has reached approximately the rated life time, the luminous flux of the discharge lamp is approximately equal to the luminous flux when the cumulative lighting time of the discharge lamp is substantially zero. As will properly discharge lamp lighting apparatus, characterized in that for controlling the inverter unit. An inverter unit connected to a DC power source and converting the DC voltage into a high frequency voltage, an inductance having one end connected to the output end of the inverter unit, a balancer having one end connected to the other end of the inductance, and one end of the balancer A plurality of series circuits of a first capacitor and a discharge lamp connected to the other end, a second capacitor connected in parallel to each discharge lamp, a second control circuit for controlling at least the inverter unit, and a discharge And a data table for storing data correlated with the decrease in luminous flux due to aging of the lamp, and the luminous flux of the discharge lamp in a state where the cumulative lighting time of the discharge lamp has substantially reached the rated life time is set as the dimming lower limit. The second control circuit corrects the light flux by referring to the data table when the cumulative lighting time of the lamp does not reach the approximate rated life time. Discharge lamp lighting device. A detection circuit that is connected to one end of the discharge lamp and detects an electrical abnormal state of the discharge lamp; and a third control circuit that receives the signal of the detection circuit and controls the output of the discharge lamp lighting device. The discharge lamp lighting device according to claim 1 or 2. A discharge lamp lighting device according to any one of claims 1 to 3, a main body on which the discharge lamp lighting device is mounted, and a discharge lamp to which electric power is supplied from the discharge lamp lighting device. Lighting device. An illumination system comprising a plurality of illumination devices according to claim 4 and a control device that controls the illumination devices.

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