WO2016103694A1 - Procédé d'éclairage à lampe à décharge et appareil d'éclairage à lampe à décharge - Google Patents

Procédé d'éclairage à lampe à décharge et appareil d'éclairage à lampe à décharge Download PDF

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Publication number
WO2016103694A1
WO2016103694A1 PCT/JP2015/006418 JP2015006418W WO2016103694A1 WO 2016103694 A1 WO2016103694 A1 WO 2016103694A1 JP 2015006418 W JP2015006418 W JP 2015006418W WO 2016103694 A1 WO2016103694 A1 WO 2016103694A1
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Prior art keywords
discharge lamp
lighting
time
short
cathode
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PCT/JP2015/006418
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English (en)
Japanese (ja)
Inventor
中村　雅規
河野　洋一
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ウシオ電機株式会社
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Priority claimed from JP2014262654A external-priority patent/JP2016122601A/ja
Priority claimed from JP2014262653A external-priority patent/JP6443037B2/ja
Application filed by ウシオ電機株式会社 filed Critical ウシオ電機株式会社
Publication of WO2016103694A1 publication Critical patent/WO2016103694A1/fr

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    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B41/00—Circuit arrangements or apparatus for igniting or operating discharge lamps
    • H05B41/14—Circuit arrangements
    • H05B41/26—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc
    • H05B41/28—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc using static converters
    • H05B41/288—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc using static converters with semiconductor devices and specially adapted for lamps without preheating electrodes, e.g. for high-intensity discharge lamps, high-pressure mercury or sodium lamps or low-pressure sodium lamps

Definitions

  • the present invention relates to a discharge lamp lighting method and a discharge lamp lighting device for lighting a discharge lamp.
  • a discharge lamp lighting device used as a light source for a movie projector in a movie theater
  • a discharge lamp lighting device provided with a short arc type xenon discharge lamp as a light source.
  • the short arc type xenon discharge lamp has an arc tube, an anode and a cathode disposed opposite to each other in the arc tube, and xenon gas sealed in the arc tube.
  • the cathode may be deformed to cause flicker.
  • the time from the start of use of the discharge lamp to the frequent occurrence of the flicker is also called flicker life.
  • Patent Document 1 International Publication No. 2014/098127. This technique restores the rough and rough surface of the cathode to a smooth shape by performing a short-time lighting operation during a rest period in which the discharge lamp is not steadily lit. Since the surface of the cathode has a smooth shape, the generation of flicker is further suppressed and a long flicker life can be obtained.
  • an object of the present invention is to provide a discharge lamp lighting method and a discharge lamp lighting device capable of performing effective short-time lighting control according to the state of the discharge lamp. Moreover, this invention makes it a subject to provide the discharge lamp lighting device which can expand the freedom degree of short-time lighting control.
  • an aspect of a discharge lamp lighting method is to supply electric energy to a discharge lamp having an arc tube, and an anode and a cathode disposed opposite to each other in the arc tube.
  • a discharge lamp lighting method for lighting the discharge lamp wherein when the discharge lamp is not steadily lit, the short-time lighting operation is performed for performing the short-time lighting operation of lighting the discharge lamp for a plurality of times for a short time.
  • the state of the discharge lamp immediately before the start of operation is determined, and a parameter relating to the electric energy supplied to the discharge lamp in the short-time lighting operation is changed according to the determined state of the discharge lamp.
  • the discharge lamp is turned on for a short time during the rest period when the discharge lamp is not steadily lit, the surface of the rough and rough cathode can be restored to a smooth shape and the occurrence of flicker can be suppressed. Can do.
  • the parameter relating to the electric energy supplied to the discharge lamp during the short-time lighting operation is changed according to the state of the discharge lamp determined immediately before the start of the short-time lighting operation. Therefore, it is possible to control lighting for a short time suitable for the state of the discharge lamp, and it is possible to appropriately repair the surface shape of the cathode. As a result, the occurrence of flicker can be effectively suppressed and a long flicker life can be obtained.
  • the parameter is at least one of a current value, a voltage value and a power value, which are magnitudes of the electric energy, a supply time of the electric energy, and a supply cycle of the electric energy. It may be one. As described above, since the magnitude of energy to be supplied, the length to be supplied, and the supply cycle are changed in accordance with the state of the discharge lamp, excessive and insufficient supply energy is suppressed, and the effect of lighting for a short time is sufficiently obtained. be able to. Furthermore, in the above-described discharge lamp lighting method, the parameter may be gradually increased for each short-time lighting.
  • the parameter is any one of a current value, a voltage value, and a power value supplied to the discharge lamp, it is possible to cope with a case where excessive energy should not be supplied first in the short-time lighting operation.
  • the parameter is a supply time of energy supplied to the discharge lamp, it is possible to deal with a case where instantaneous energy supply should be performed first in a short lighting operation.
  • appropriate control according to the state of the discharge lamp is possible.
  • the parameter may be gradually decreased for each short-time lighting.
  • the parameter is any one of a current value, a voltage value, and a power value supplied to the discharge lamp, it is possible to cope with a case where excessive energy should be supplied first in a short-time lighting operation.
  • the parameter is a supply time of energy supplied to the discharge lamp, it is possible to cope with a case where instantaneous energy supply should not be initially performed in a short-time lighting operation.
  • the increase and decrease of the parameter may be repeated for each short-time lighting.
  • the state of the discharge lamp may be determined based on the temperature of the cathode. In this way, by determining the temperature of the cathode, it is possible to determine the amount of energy to be supplied in consideration of the amount of energy that the cathode already has at the time of starting the short-time lighting operation. Therefore, excess or deficiency of supply energy in the short-time lighting operation can be solved and appropriate control can be performed. Furthermore, in the above discharge lamp lighting method, the state of the discharge lamp may be determined based on the degree of wear of the cathode.
  • the temperature of the cathode can be appropriately increased in the short-time lighting operation.
  • an aspect of the discharge lamp lighting device is an arc tube, an anode and a cathode disposed opposite to each other in the arc tube, and supplying the discharge lamp with electric energy.
  • a short-time lighting operation unit a determination unit for determining a state of the discharge lamp immediately before starting the short-time lighting operation by the short-time lighting operation unit, and a state of the discharge lamp determined by the determination unit Accordingly, the parameter for determining the parameter so that the parameter relating to the electric energy supplied to the discharge lamp is changed by the short-time lighting operation by the short-time lighting operation unit. It includes a tough, a.
  • the discharge lamp is turned on for a short time during the rest period when the discharge lamp is not steadily lit, the surface of the rough and rough cathode can be restored to a smooth shape and the occurrence of flicker can be suppressed. Can do.
  • the parameter relating to the electric energy supplied to the discharge lamp during the short-time lighting operation is changed according to the state of the discharge lamp determined immediately before the start of the short-time lighting operation. Therefore, it is possible to control lighting for a short time suitable for the state of the discharge lamp, and it is possible to appropriately repair the surface shape of the cathode. As a result, the occurrence of flicker can be effectively suppressed and a long flicker life can be obtained.
  • the control unit includes an open voltage generation unit including a fixed logic circuit that generates an open voltage between the anode and the cathode at the start of lighting, and the lighting circuit after lighting. And a digital control unit capable of programmable control.
  • the parameter relating to the electric energy supplied to the discharge lamp during the short-time lighting operation is changed according to the state of the discharge lamp determined immediately before the start of the short-time lighting operation. Therefore, it is possible to control lighting for a short time suitable for the state of the discharge lamp, and it is possible to appropriately repair the surface shape of the cathode. As a result, the occurrence of flicker can be effectively suppressed and a long flicker life can be obtained.
  • the parameter determination unit includes, as the parameters, a current value, a voltage value and a power value, which are magnitudes of the electric energy, a supply time of the electric energy, and a supply of the electric energy. At least one of the periods may be determined. As described above, since the magnitude of energy to be supplied, the length to be supplied, and the supply cycle are changed in accordance with the state of the discharge lamp, excessive and insufficient supply energy is suppressed, and the effect of lighting for a short time is sufficiently obtained. be able to.
  • an aspect of the discharge lamp lighting device is an arc tube, an anode and a cathode disposed opposite to each other in the arc tube, and supplying the discharge lamp with electric energy.
  • the unit includes an open-circuit voltage generation unit including a fixed logic circuit that generates an open-circuit voltage between the anode and the cathode at the time of starting lighting, and a digital control unit that can control the lighting circuit after lighting. .
  • the discharge lamp is turned on for a short time during the rest period when the discharge lamp is not steadily lit, the surface of the rough and rough cathode can be restored to a smooth shape and the occurrence of flicker can be suppressed. Can do.
  • the so-called digital control that controls the lighting circuit via a program is possible, the degree of freedom of the short-time lighting control can be expanded, and control that sufficiently obtains the effect of short-time lighting is possible. It becomes.
  • the present invention it is possible to perform appropriate short-time lighting control according to the state of the discharge lamp.
  • the degree of freedom of short-time lighting control can be expanded and the effect of short-time lighting can be sufficiently obtained. Therefore, the occurrence of flicker can be effectively suppressed and a long flicker life can be obtained.
  • FIG. 1 is a diagram illustrating a configuration example of a lamp lighting device according to the present embodiment.
  • FIG. 2 is a configuration diagram illustrating an example of a discharge lamp.
  • FIG. 3 is a diagram showing a lamp current and a lamp voltage when the discharge lamp is turned on.
  • FIG. 4A is a diagram illustrating an example of a short-time lighting method.
  • FIG. 4B is a diagram illustrating an example of a short-time lighting method.
  • FIG. 5A is a diagram illustrating an example of a short-time lighting method.
  • FIG. 5B is a diagram illustrating an example of a short-time lighting method.
  • FIG. 6 is a diagram illustrating an example of a short-time lighting method.
  • FIG. 7 is a diagram illustrating an example of a short-time lighting method.
  • FIG. 8 is a diagram showing temperature characteristics of the discharge lamp.
  • FIG. 9A is a diagram showing the electrode shape of the discharge lamp.
  • FIG. 9B is a diagram showing the electrode shape of the discharge lamp.
  • FIG. 10 is a flowchart showing a short-time lighting processing procedure.
  • FIG. 11 is a diagram for explaining the configuration of the control unit in the present embodiment.
  • FIG. 12 is a diagram for explaining the configuration of a conventional control unit.
  • FIG. 1 is a diagram illustrating a configuration example of a lamp lighting device according to the present embodiment.
  • the lamp lighting device 10 includes a lighting circuit 30 connected to a commercial AC power supply 20 and a control unit 40 that controls the lighting circuit 30, and supplies power to a discharge lamp 50 as a load. As a result, the discharge lamp 50 is turned on.
  • the lamp lighting device 10 can be used as a light source for a digital projector in a movie theater, for example.
  • the lighting circuit 30 includes an input circuit unit 31, a step-up / step-down circuit unit 32, an inverter circuit unit 33, and a rectifier circuit unit 34.
  • the input circuit unit 31 includes a circuit breaker, an EMI (Electromagnetic Interference) filter (noise filter), an inrush prevention circuit, and the like, and is connected to the commercial AC power supply 20.
  • EMI Electromagnetic Interference
  • the step-up / down circuit unit 32 includes a rectifier, a capacitor, a chopper coil, a switching element, a switching element drive circuit, an input voltage detection circuit, an output voltage detection circuit, and the like.
  • the step-up / step-down circuit unit 32 converts the AC voltage of the AC power supply 20 into a DC voltage by a rectifier, and then boosts and lowers the voltage with a so-called chopper circuit using an inductance.
  • the inverter circuit unit 33 includes a bridge circuit including a switching element, a switching driver circuit, a resonance capacitor, an insulating transformer, and the like, and converts a DC power source into a high frequency AC power source.
  • the rectifier circuit unit 34 includes a rectifier diode, a ripple suppression coil, a snubber circuit, and the like, and converts the high-frequency AC power converted by the inverter circuit unit 33 into a DC voltage.
  • the control unit 40 performs constant power control or constant current control on the lighting circuit 30, and includes a control circuit unit 41, a multiplication circuit unit 42, an A / D conversion unit 43, an IF unit 44, and a time counting unit 45. And a timer unit 46.
  • the control circuit unit 41 is mainly composed of a digital control element composed of a CPU and a DSP, and other peripheral elements, and controls the switching driver circuits of the step-up / step-down circuit unit 32 and the inverter circuit unit 33. For the control, for example, a phase shift type synchronous rectification method is adopted.
  • the A / D converter 43 receives the lamp voltage V, the lamp current I, and the lamp voltage W, and converts these input analog signals into, for example, a 12-bit digital signal.
  • the IF unit 44 is a circuit capable of communicating with an external device, and inputs / outputs information to / from the external device. For example, the IF unit inputs, from an external device, a lamp lighting signal (start signal) for starting lighting of the discharge lamp 50, a lamp extinguishing signal for turning off the discharge lamp 50, and the like.
  • the IF unit 44 includes a digital I / O, a communication circuit, and the like.
  • the time measuring unit 45 generates a reference signal for controlling the ON time and OFF time of the pulse signal used in the phase modulation control performed by the control circuit unit 41, and outputs this to the control circuit unit 41.
  • the timer unit 46 measures the total lighting time of the discharge lamp 50, the time after the discharge lamp 50 is extinguished, and the like, and stores the measured time and outputs it to the control circuit unit 41.
  • the discharge lamp 50 is, for example, a short arc type xenon discharge lamp. As shown in FIG. 2, the discharge lamp 50 includes an elliptical arc tube 51 made of quartz glass or the like. Cylindrical electrode support portions 52a and 52b extending outwardly along the tube axis are connected to both ends of the arc tube 51. In addition, sealing tubes 53a and 53b having outer diameters larger than those of the electrode support portions 52a and 52b are connected to the outer ends of the electrode support portions 52a and 52b.
  • a discharge space is formed inside the arc tube 51, and a luminescent gas containing xenon (Xe) gas is sealed therein.
  • a pair of electrodes (anode 54a and cathode 54b) facing each other are arranged. These electrodes 54a and 54b are made of a refractory metal such as tungsten.
  • An electrode rod 55a extending outward from the anode 54a along the tube axis is led out from the end of the sealing tube 53a.
  • the electrode rod 55a is sealed (rod sealed) at the end of the sealing tube 53a by means such as a step glass.
  • the electrode rod 55b extending outward from the cathode 54b along the tube axis is led out from the end of the sealing tube 53b.
  • the electrode rod 55b is sealed (rod sealed) at the end portion of the sealing tube 53b by means such as stepped glass.
  • cylindrical glass members 56a and 56b are provided on the peripheral surfaces of the portions of the electrode rods 55a and 55b located at the electrode support portions 52a and 52b, respectively.
  • the electrode rods 55a and 55b are supported by the electrode support portions 52a and 52b through the glass members 56a and 56b.
  • FIG. 3 is a diagram showing the lamp current I and the lamp voltage V when the discharge lamp 50 is lit.
  • the lamp lighting device 10 applies an external igniter with a voltage (for example, about 100 V) higher than a rated voltage (for example, about 40 V) called an open circuit voltage applied to the discharge lamp 50. A higher voltage is applied between the lamp terminals. Thereby, the lamp lighting device 10 generates a dielectric breakdown in the discharge space to form a discharge path (time t1). When dielectric breakdown occurs, the lamp lighting device 10 causes an inrush current to flow to the discharge lamp 50 (time t2), and shifts to arc discharge through glow discharge.
  • a voltage for example, about 100 V
  • a rated voltage for example, about 40 V
  • the lamp lighting device 10 performs control (constant current control) so as to stably maintain the arc discharge. Thereby, steady lighting is achieved (after time t3).
  • time t3 the time (time t1 to time t3) required until steady lighting is achieved after dielectric breakdown occurs is, for example, about 20 milliseconds.
  • the control unit 40 performs the steady lighting control of the discharge lamp 50, and the short-time lighting control for lighting the discharge lamp 50 at least once for a short period during the rest period in which the discharge lamp 50 is not steadily lit. I do.
  • the discharge lamp 50 is lit for a long time by performing a short-time lighting operation when the discharge lamp 50 is not steadily lit, the occurrence of flicker in the discharge lamp 50 is suppressed, and a long flicker is achieved. Life expectancy is obtained.
  • the discharge lamp 50 is turned on for a long time, the surface shape of the cathode 54b is rough and rough immediately after the lamp is turned off.
  • the lighting time for one short lighting is set to 0.5 seconds to 1.0 seconds, for example. If the lighting time for one time is less than 0.1 seconds, the temperature of the cathode 54b does not rise sufficiently and the tip is not activated. If the lighting time for one time exceeds 5 seconds, the tip of the activated cathode 54b advances in the inactive direction again, and it is not possible to obtain the effect of lighting for a sufficiently short time. Therefore, it is preferable to set the lighting time for one time within the range of 0.1 seconds to 5.0 seconds.
  • the short-time lighting operation is an operation for lighting for a sufficiently short time as compared with the steady lighting which can be several hours.
  • the off time from the end of one short time lighting to the start of the subsequent short time lighting is set to 1 second, for example. If the off-time is less than 1 second, the temperature of the cathode 54b cannot be sufficiently lowered, and sufficient thermal shock cannot be obtained during the next short-time lighting. Therefore, it is preferable to set the off time to at least 1 second. Further, the number of times of lighting is set to 5 to 6 times, for example. Further, the short-time lighting operation of the discharge lamp 50 can be executed at an arbitrary timing as long as the discharge lamp 50 is in a rest period in which the discharge lamp 50 is not steadily lit.
  • the short-time lighting operation may be performed immediately before starting steady lighting during the pause period, or may be performed immediately after stopping steady lighting. Furthermore, the short-time lighting operation does not necessarily have to be executed every pause period, and for example, the short-time lighting operation may be executed once per two pause periods.
  • the short-time lighting operation is performed by supplying pulsed energy to the discharge lamp 50.
  • This pulse signal is supplied to the discharge lamp 50 by the operation of the lighting circuit 30 and the control unit 40 in the same process as the steady lighting of the discharge lamp 50.
  • the energy supplied to the discharge lamp 50 is defined by any one of the lamp current, the lamp voltage, and the lamp power.
  • the control method for the short-time lighting operation is changed according to the state of the discharge lamp 50. Specifically, depending on the state of the discharge lamp 50, the amount of energy (current value, voltage value, power value) supplied to the discharge lamp 50 in the short-time lighting operation, energy supply time, and energy supply cycle elements At least one of them is changed. Further, as the state of the discharge lamp 50, the temperature of the electrode (cathode 54b) and the degree of wear of the electrode (cathode 54b) are determined.
  • FIGS. 4A and 4B there is a method of changing (increasing or decreasing) the pulse current (or voltage or power) supplied to the discharge lamp 50 step by step as shown in FIGS. 4A and 4B, for example.
  • the pulse current or voltage or power
  • the pulse current is increased by ⁇ I until the pulse current reaches a predetermined reached current I2 from the initial current I1.
  • ⁇ I initial current I1 +
  • N is the number of pulses.
  • the pulse current (or voltage, power) is decreased stepwise, the current ⁇ I is decreased by the above-mentioned current ⁇ I until the pulse current reaches the predetermined reached current I2 from the initial current I1. .
  • the pulse width or pulse period of the pulse current (or voltage or power) supplied to the discharge lamp 50 is changed (increased) stepwise. (Or decrease).
  • the pulse width of the pulse current (or voltage, power) is increased stepwise, the pulse width reaches a predetermined arrival time (arrival pulse width) T2 from the initial time (initial pulse width) T1.
  • arrival pulse width initial time T1 +
  • the pulse width of the pulse current (or voltage, power) is decreased step by step, the time ⁇ T until the pulse width reaches the predetermined arrival time T2 from the initial time T1. Decrease by increments. The same applies when changing the pulse period.
  • the pulse current (or voltage, power) may be changed so that the increase and decrease are repeated.
  • the pulse width may be changed so that the increase and decrease are repeated.
  • the above increase and decrease may be changed in combination at random.
  • increase / decrease in pulse current (or voltage, power) and increase / decrease in pulse width may be combined.
  • a method for changing the peak value or pulse width of each pulse during the short-time lighting operation may be determined.
  • FIG. 8 is a temperature characteristic diagram showing a temperature change of the cathode 54b after the discharge lamp 50 is turned off.
  • the cathode 50 of the discharge lamp 50 in the present embodiment is constituted by a main body portion made of tungsten (W) and a tip portion made of tritium tungsten in which tungsten (W) contains thorium oxide (ThO 2 ). .
  • W tungsten
  • ThO 2 thorium oxide
  • the short-time lighting operation is intended to melt the surface of the cathode 54b with heat at the time of lighting so as to obtain a smooth shape. Therefore, when the cathode 54b is cooled to substantially room temperature, it is necessary to increase the temperature of the cathode 54b by supplying relatively large energy in the short-time lighting operation.
  • the cathode 54b has a relatively high temperature (for example, at 800 ° C.)
  • the short-time lighting operation when the same energy as that in the case where the cathode 54b is sufficiently cooled (when the temperature is approximately room temperature) is supplied, There is a possibility that the temperature of the cathode 54b will rise too much and the surface shape will not become a desired shape.
  • the higher the temperature of the cathode 54b at the start of the short lighting operation the smaller the amount of energy supplied first in the short lighting operation.
  • the temperature of the cathode 54b of the discharge lamp 50 is high, in the short-time lighting operation, energy lower than the steady lighting energy is first supplied to the electrode (cathode 54b), and then the supplied energy is stepwise. Increase to.
  • the cathode 54b of the discharge lamp 50 is sufficiently cooled (almost at room temperature)
  • energy larger than the steady lighting energy is first supplied to the electrode (cathode 54b). Then, the energy to be supplied is decreased stepwise.
  • the temperature of the cathode 54b is determined based on the temperature characteristics shown in FIG. 8 stored in advance based on the time after the discharge lamp 50 stored in the timer unit 46 is turned off.
  • the cathode 54b of the discharge lamp 50 is worn at the tip as the lighting time is longer.
  • 9A and 9B are diagrams showing the electrode shape of the discharge lamp 50.
  • FIG. 9A shows a new discharge lamp 50 that is not worn
  • FIG. 9B shows the shape of the electrode of the old discharge lamp 50 that is worn for a long time.
  • the cathode 54b has a tapered shape that becomes narrower toward the tip, and the surface area of the discharge portion increases as the degree of wear at the tip increases. For this reason, in the worn out old discharge lamp 50, even if energy is supplied instantaneously in a short lighting operation, only a part of the temperature rises, and the surface shape may not be a desired shape.
  • the higher the degree of wear of the cathode 54b at the start of the short-time lighting operation the longer the supply time of energy supplied first in the short-time lighting operation.
  • the degree of wear of the cathode 54b of the discharge lamp 50 is high, the supply time of energy supplied to the electrode (cathode 54b) first in a short lighting operation is compared with the case where no wear has occurred. Increase the feed time and then reduce the feed time step by step.
  • the degree of wear is low, there is no problem even if excessive energy is supplied in a short time in the short lighting operation, and therefore, the supply time of the energy supplied first is made relatively short.
  • the degree of wear of the cathode 54b of the discharge lamp 50 is high, the amount of energy supplied to the electrode (cathode 54b) first is reduced in the short-time lighting operation as compared with the case where the degree of wear is low. That is, low energy is supplied to the discharge lamp 50 over time. Thereby, the temperature of the whole front-end
  • the degree of wear of the cathode 54 b is determined based on the total lighting time of the discharge lamp 50 stored in the timer unit 46.
  • the number of times of energy supply that is, the number of pulses N is changed. You can also For example, the higher the degree of wear of the cathode 54b, the more time it takes to repair the surface shape of the cathode 54b.
  • FIG. 10 is a flowchart showing a lighting process procedure of the discharge lamp 50.
  • This lighting process is executed by the control circuit unit 41, for example.
  • the control circuit unit 41 performs a process of acquiring a start signal (lighting signal) for the discharge lamp 50 from the IF unit 44, and proceeds to step S2.
  • the control circuit unit 41 determines whether or not the activation signal acquired in step S ⁇ b> 1 is an on state instructing lighting of the discharge lamp 50. Then, the control circuit unit 41 returns to step S1 when the activation signal is in the off state, and proceeds to step S3 when the activation signal is in the on state.
  • step S3 the control circuit unit 41 determines whether or not the current lighting is the first lighting (whether there is a lighting history). For example, the control circuit unit 41 reads the total lighting time of the discharge lamp 50 stored in the timer unit 46, determines that it is the first lighting when the total lighting time is 0, and proceeds to step S8 described later. Transition. On the other hand, if the total lighting time is other than 0, the control circuit unit 41 determines that there is a lighting history, and proceeds to step S4.
  • step S4 the control circuit unit 41 determines the state of the discharge lamp 50.
  • the control circuit unit 41 determines the state (temperature, degree of wear) of the electrode (cathode 54b) as the state of the discharge lamp 50. That is, in this step S4, the control circuit unit 41 acquires the elapsed time since the discharge lamp 50 stored in the timer unit 46 was extinguished last time and the total lighting time of the discharge lamp 50. Then, the control circuit unit 41 determines the temperature of the cathode 54b based on the elapsed time since the light is turned off, and determines the degree of wear of the cathode 54b based on the total lighting time.
  • the control circuit unit 41 determines a short-time lighting operation mode (short-time lighting mode) based on the state of the discharge lamp 50 determined in step S4.
  • the short-time lighting mode is defined by various parameters such as the initial current I1, the reached current I2, the initial time T1, the arrival time T2, and the number of pulses N described above. That is, the short-time lighting mode determination process includes increasing the initial short-time lighting current (or voltage, power) value, the number of short-time lighting repetitions, and the current value (or voltage value, power value). Whether to decrease, whether to increase and decrease, or to increase or decrease the duration of the first short-time lighting, whether to increase or decrease the duration, This is a process of determining matters such as whether or not.
  • step S5 when the short-time lighting mode corresponding to the temperature and the degree of wear of the cathode 54b is determined, the process proceeds to step S6, and the control circuit unit 41 performs a short-time based on the short-time lighting mode determined in step S5. Perform the lighting operation.
  • step S7 the control circuit unit 41 determines whether or not to end the short-time lighting operation.
  • the control circuit unit 41 determines whether or not to end the short-time lighting operation, for example, by determining whether or not the number of repetitions of short-time lighting has reached the set number of pulses N. If the number of pulses N has not been reached, the control circuit unit 41 determines that the short-time lighting operation is to be continued and returns to step S6. If the number of pulses N has been reached, the control circuit unit 41 performs the short-time lighting operation. It is determined that the process is to end, and the process proceeds to step S8. In step S8, the control circuit unit 41 performs the steady lighting operation of the discharge lamp 50 described above, and proceeds to step S9.
  • step S ⁇ b> 9 the control circuit unit 41 determines whether a turn-off signal for the discharge lamp 50 has been received from the IF unit 44. When the control circuit unit 41 has not confirmed the reception of the turn-off signal, the control circuit unit 41 determines to continue the steady lighting operation and returns to step S8. When the reception of the turn-off signal is confirmed, the control circuit unit 41 performs the steady lighting operation. It is determined that the process is to end, and the process proceeds to step S10.
  • step S10 the control circuit unit 41 turns off the discharge lamp 50, and starts counting a turn-off timer for measuring the elapsed time after the discharge lamp 50 is turned off.
  • step S11 the control circuit unit 41 determines whether or not to end the lighting process of the discharge lamp 50. If the lighting process is continued, the control circuit unit 41 returns to step S1. The lighting process ends.
  • the lighting process shown in FIG. 10 is an example in which a short-time lighting operation is performed immediately before the steady lighting operation of the discharge lamp 50.
  • the lighting process in the case where the lighting operation is performed for a short time after the discharge lamp 50 is turned off is basically the same as in FIG.
  • the control circuit unit 41 sets the short-time lighting mode based on the total lighting time of the discharge lamp 50 or the elapsed time since the previous lighting was turned off has been described, but the present invention is not limited thereto. It is not something.
  • the short-time lighting mode various patterns based on the total lighting time of the discharge lamp 50 and the elapsed time since the last extinguishing are obtained through experiments, and the control circuit unit 41 stores them in advance. Good.
  • the control circuit unit 41 only needs to read the short-time lighting mode corresponding to the total lighting time of the discharge lamp 50 and the elapsed time since the previous light-off, and the processing man-hours can be reduced.
  • the control unit 40 that controls the lighting circuit 30 is configured so as to perform so-called digital control capable of programmable control. That is, as shown in FIG. 11, the control unit 40 is configured to include a digital control unit 401, and for example, performs on / off control of the switching element of the inverter through a program without using a pulse generation dedicated IC.
  • the degree of freedom of short-time lighting control can be increased, and the effect of short-time lighting can be sufficiently obtained.
  • digital calculation is performed by software, there is a delay corresponding to the conversion time from the analog signal to the digital signal and the processing time of the above calculation. Therefore, it is difficult to realize a short-time lighting operation that repeats a quick operation such as instantaneous lighting and instantaneous light-off only by digital control.
  • a constant current control operation (control to detect a secondary lamp current and make the current constant) is set.
  • this control since the current does not flow immediately after the operation, the conduction angle of the inverter becomes maximum. However, at this time, no current flows from the inverter.
  • the inverter operates, the auxiliary transformer is excited, energy is stored in the output-side capacitor, and an open voltage (open voltage) is generated.
  • the auxiliary transformer is always operating. When a high frequency high voltage is superimposed from the external igniter in this state, breakdown occurs inside the discharge lamp 50 and current starts to flow rapidly. That is, lighting starts at this point.
  • the suddenly flowing current is reduced by constant current control and kept constant. Thereby, stable lighting is achieved.
  • the operation of turning on (lighting) the discharge lamp 50 for 0.5 second to 1.0 second and then turning off (lighting off) for 1 second is repeated a plurality of times. In this manner, an operation of causing a current to flow suddenly or interrupting the current within a short time within one second is performed.
  • a current starts to flow particularly at the time of lighting, but if this initial current is passed too much, the electrode is damaged, and if it is too small, the broken lamp disappears.
  • the initial current greatly affects the lighting performance and life of the discharge lamp. Therefore, the control at the beginning of lighting is an important element in power supply control.
  • the control unit 40 includes a digital control unit 401 and an analog control unit 402.
  • the analog control unit 402 includes an open circuit voltage generation unit including a fixed logic circuit that generates an open circuit voltage before lighting.
  • the analog control unit 1401 performs control for generating an open circuit voltage and control of the switching element of the inverter. It will be.
  • the control of the inverter only routine control that changes the ratio between the on time and the off time at a constant frequency can be performed. That is, in the short-time lighting operation, it is only possible to perform control that repeats a pulse determined with a constant energy, and in the short-time lighting operation, the discharge lamp 50 is in accordance with the state of the discharge lamp 50 as in the present embodiment. The pattern of energy supplied to 50 cannot be changed variously.
  • the lamp lighting device 10 realizes the operation of generating an open voltage before lighting by analog control, and realizes constant current control after starting lighting by digital control.
  • the digital control it is possible to appropriately execute a short-time lighting operation in which the pattern of energy supplied to the discharge lamp 50 is variously changed according to the state of the discharge lamp 50 and the short-time lighting is repeated.
  • the lamp lighting device 10 can realize a short-time lighting operation with a high degree of freedom.
  • the above-described analog control makes it possible to cope with excessive electrical fluctuations in a short time, which is difficult to control only by digital control, and can appropriately perform an operation at the start of lighting.
  • the lamp lighting device 10 employs phase modulation control with little switching loss (loss at turn-on and turn-off) as a control method of the inverter, it is possible to reduce the size and increase the efficiency of the power source. Further, in the present embodiment, the lamp lighting device 10 determines the state of the discharge lamp 50 immediately before the start of the short-time lighting operation, and the discharge lamp 50 during the short-time lighting operation according to the determined state of the discharge lamp 50. The parameters (electric energy supply amount, energy supply time, number of times of energy supply, etc.) relating to the electric energy supplied to the battery are changed. Therefore, the lamp lighting device 10 can perform lighting control for a short time suitable for the state of the discharge lamp 50, and can appropriately repair the surface shape of the cathode. As a result, the lamp lighting device 10 can appropriately suppress the occurrence of flicker and obtain a long flicker life.
  • the above parameters are gradually increased during the short lighting operation, for example, excessive energy should not be supplied first in the short lighting operation, or instantaneous energy supply should be performed first. It is possible to cope with the case. Conversely, if the above parameters are gradually decreased, for example, it corresponds to the case where excessive energy should be supplied first in the short-time lighting operation or the case where instantaneous energy supply should not be supplied first. be able to.
  • the lamp lighting device 10 determines the state of the discharge lamp 50 based on the temperature of the cathode 54b immediately before the start of the short lighting operation. Therefore, the lamp lighting device 10 can determine the amount of energy to be supplied in consideration of the amount of energy that the cathode 54b already has at the time of starting the short-time lighting operation. Therefore, the lamp lighting device 10 can solve the excess and deficiency of the supply energy in the short-time lighting operation, and can perform appropriate control. Furthermore, since the lamp lighting device 10 estimates the temperature of the cathode 54b based on the elapsed time since the discharge lamp 50 is extinguished, there is no need to install a temperature sensor or the like. Thus, the lamp lighting device 10 can determine the state of the discharge lamp 50 relatively easily.
  • the lamp lighting device 10 determines the state of the discharge lamp 50 based on the degree of wear of the cathode 54b immediately before the start of the short-time lighting operation. Therefore, the lamp lighting device 10 can determine the amount of energy to be supplied and the supply time of energy in consideration of a change in the shape of the cathode 54b due to wear of the cathode 54b. Therefore, the lamp lighting device 10 can appropriately raise the temperature of the cathode 54b in the short-time lighting operation. Furthermore, since the lamp lighting device 10 estimates the degree of wear of the cathode 54b based on the total lighting time of the discharge lamp 50, the state of the discharge lamp 50 can be determined relatively easily.
  • the cathode 54b of the discharge lamp 50 in the present embodiment includes the main body portion made of tungsten and the tip portion made of triated tungsten.
  • the thorium oxide contained at the tip of the cathode 54b is reduced by the cathode 54b becoming high temperature during lamp operation, and becomes thorium atoms.
  • Thorium atoms generated by reduction inside the cathode 54b are transported to the surface of the cathode 54b by grain boundary diffusion between tungsten crystal grains, and move to the tip side of the cathode 54b where the temperature is higher and evaporate. At this time, large emission is obtained, and good arc discharge characteristics are obtained.
  • Triated tungsten electrodes have a polycrystalline structure, and there are crystal grain boundaries between adjacent single crystals. However, when the temperature is increased, secondary crystals are formed (and in some cases, fused), and the crystal grain boundaries decrease. To do. When the crystal grain boundary is reduced, the work function of the triated tungsten is prevented from being lowered, and atoms are not easily released from the electrode surface.
  • SYMBOLS 10 Lamp lighting device, 20 ... AC power supply, 30 ... Lighting circuit, 31 ... Input circuit part, 32 ... Buck-boost circuit part, 33 ... Inverter circuit part, 34 ... Rectifier circuit part, 40 ... Control part, 41 ... Control circuit Unit, 42 ... multiplication circuit unit, 43 ... A / D conversion unit, 44 ... IF unit, 45 ... time counting unit, 46 ... timer unit, 50 ... discharge lamp, 51 ... arc tube, 52a, 52b ... electrode support unit, 53a, 53b ... sealing tube, 54a ... anode, 54b ... cathode, 55a, 55b ... electrode rod, 56a, 56b ... glass member

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  • Circuit Arrangements For Discharge Lamps (AREA)

Abstract

L'invention concerne un procédé d'éclairage à lampe à décharge et un appareil d'éclairage à lampe à décharge qui sont capables d'effectuer une commande d'éclairage de courte durée efficace en fonction de l'état d'une lampe à décharge. L'appareil d'éclairage à lampe à décharge effectue une opération d'éclairage de courte durée pour allumer la lampe à décharge pendant une courte durée un nombre multiple de fois lorsque la lampe à décharge n'est pas allumée de manière stable. À ce point, l'appareil d'éclairage à lampe à décharge détermine l'état de la lampe à décharge à un instant immédiatement avant le début de l'opération d'éclairage de courte durée, et change des paramètres (l'intensité d'énergie électrique, le temps d'alimentation en énergie électrique, et/ou la période d'alimentation en énergie électrique) se rapportant à l'énergie électrique fournie à la lampe à décharge par l'intermédiaire de l'opération d'éclairage de courte durée en fonction de l'état déterminé de la lampe à décharge.
PCT/JP2015/006418 2014-12-25 2015-12-23 Procédé d'éclairage à lampe à décharge et appareil d'éclairage à lampe à décharge WO2016103694A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
JP2014262654A JP2016122601A (ja) 2014-12-25 2014-12-25 放電ランプ点灯装置
JP2014262653A JP6443037B2 (ja) 2014-12-25 2014-12-25 放電ランプ点灯方法
JP2014-262653 2014-12-25
JP2014-262654 2014-12-25

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003100474A (ja) * 2001-09-25 2003-04-04 Matsushita Electric Works Ltd 放電灯点灯制御装置
JP2006147363A (ja) * 2004-11-19 2006-06-08 Ushio Inc ショートアーク型放電ランプ点灯装置
JP2009076419A (ja) * 2007-09-25 2009-04-09 Seiko Epson Corp 光源装置、及びプロジェクタ
JP2009199739A (ja) * 2008-02-19 2009-09-03 Seiko Epson Corp 放電灯の駆動方法、駆動装置、及びプロジェクタ
WO2014098127A1 (fr) * 2012-12-21 2014-06-26 ウシオ電機株式会社 Dispositif d'éclairage à lampe à décharge

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003100474A (ja) * 2001-09-25 2003-04-04 Matsushita Electric Works Ltd 放電灯点灯制御装置
JP2006147363A (ja) * 2004-11-19 2006-06-08 Ushio Inc ショートアーク型放電ランプ点灯装置
JP2009076419A (ja) * 2007-09-25 2009-04-09 Seiko Epson Corp 光源装置、及びプロジェクタ
JP2009199739A (ja) * 2008-02-19 2009-09-03 Seiko Epson Corp 放電灯の駆動方法、駆動装置、及びプロジェクタ
WO2014098127A1 (fr) * 2012-12-21 2014-06-26 ウシオ電機株式会社 Dispositif d'éclairage à lampe à décharge

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