WO2011138846A1 - 高圧放電ランプ点灯装置、それを用いた高圧放電ランプ装置、その高圧放電ランプ装置を用いたプロジェクタ、および高圧放電ランプの点灯方法 - Google Patents
高圧放電ランプ点灯装置、それを用いた高圧放電ランプ装置、その高圧放電ランプ装置を用いたプロジェクタ、および高圧放電ランプの点灯方法 Download PDFInfo
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- WO2011138846A1 WO2011138846A1 PCT/JP2011/000194 JP2011000194W WO2011138846A1 WO 2011138846 A1 WO2011138846 A1 WO 2011138846A1 JP 2011000194 W JP2011000194 W JP 2011000194W WO 2011138846 A1 WO2011138846 A1 WO 2011138846A1
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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
- H05B41/2881—Load circuits; Control thereof
- H05B41/2882—Load circuits; Control thereof the control resulting from an action on the static converter
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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
- H05B41/36—Controlling
- H05B41/38—Controlling the intensity of light
- H05B41/382—Controlling the intensity of light during the transitional start-up phase
- H05B41/388—Controlling the intensity of light during the transitional start-up phase for a transition from glow to arc
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
Definitions
- the present invention relates to a high-pressure discharge lamp lighting device, a high-pressure discharge lamp device using the same, a projector using the high-pressure discharge lamp device, and a high-pressure discharge lamp lighting method.
- high-pressure discharge lamps especially high-pressure mercury lamps, which are close to point light sources, are widely used as light sources.
- the high-pressure mercury lamp has an arc tube in which mercury as a luminescent substance is enclosed and a pair of tungsten electrodes are arranged so as to be substantially opposite to each other, and generates arc discharge between the electrodes to emit light. The light is emitted.
- a constant current value Ic is supplied to be lit.
- a lighting device is widely used that is lit by supplying a constant power with a lamp power of a rated lamp power value Pr.
- current value Ia the current value of the limit current value Ia.
- the current value Id uses the upper limit value V high of the tolerance range in the rated lamp voltage and the rated lamp power value Pr, which are defined in consideration of manufacturing variations of the high-pressure mercury lamp. (Id ⁇ Pr / V high ).
- the current value Ic in the conventional lighting device is the same as the magnitude of the limit current value Ia.
- the current value Id becomes smaller than the limit current value Ia and the current value Ic, the current value becomes smaller, so that the temperature rise of the pair of electrodes can be suppressed as compared with the conventional lighting device. It is said that wear can be suppressed.
- 14 (a) to 14 (c) are graphs showing the relationship among lamp power, lamp voltage and lamp current, and lighting time when the lamp is lit by the lighting device described in Patent Document 1, with solid lines. Moreover, each relationship when it lights with the said conventional lighting device is shown with the dashed-two dotted line.
- the rated lamp power of the high-pressure mercury lamp is 250 [W]
- the rated lamp voltage is 80 [V]
- the tolerance range of the rated lamp voltage is 62.5 [V] to 95 [V].
- the current value Ic (4 [4] in the conventional lighting device is started until the lamp voltage reaches 80 [V] from the start of lighting.
- a current value Id (2.5 [A]) smaller than A]) is supplied.
- the electric current value when it transfers to the constant electric power supply of the rated lamp electric power 250 [W] is 3.125 [A], and is smaller than the electric current value Ic.
- the present invention has been made in view of such circumstances, and is capable of suppressing a slow rise of the lamp while suppressing a pair of electrodes in the high-pressure discharge lamp from being worn out as compared with the prior art. It is an object of the present invention to provide a discharge lamp lighting device, a high-pressure discharge lamp device using the same, a projector using the high-pressure discharge lamp device, and a lighting method for the high-pressure discharge lamp.
- a high-pressure discharge lamp lighting device is a high-pressure discharge lamp lighting device for lighting a high-pressure discharge lamp having an arc tube in which a luminescent material is enclosed and a pair of electrodes are arranged to face each other.
- a power supply unit that supplies power to the high-pressure discharge lamp, a constant power control that controls the power supply unit so that the lamp power maintains a constant power, and a control unit that controls the power supply unit so that the lamp current maintains a constant current
- a constant current control selectively, and under the constant power control, a control unit that controls the power supply unit so that a lamp current becomes equal to or less than a limit current value Ia, the control unit from the start of lighting Constant current control for controlling the power supply unit so that at least a lamp current maintains a predetermined current value Ib smaller than the limit current value Ia until a predetermined time elapses; and the constant current
- the control of the original has reached a predetermined power value P low lower than the rated lamp power value Pr, the control
- the high-pressure discharge lamp device includes a high-pressure discharge lamp having an arc tube in which a luminescent material is enclosed and a pair of electrodes are arranged opposite to each other, and the high-pressure discharge for lighting the high-pressure discharge lamp. And a lamp lighting device.
- a projector according to the present invention includes the high-pressure discharge lamp device.
- the method for lighting a high-pressure discharge lamp includes a power supply unit that supplies power to a high-pressure discharge lamp having a light-emitting tube in which a light-emitting substance is enclosed and a pair of electrodes are opposed to each other. And selectively performing constant power control for controlling the power supply unit so that lamp power maintains constant power, and constant current control for controlling the power supply unit so that lamp current maintains constant current.
- the lighting device includes a control unit that controls the power supply unit so that the lamp current becomes equal to or less than the limit current value Ia.
- predetermined power value P low lower than Pr includes the steps of constant power control the power supply unit so that the lamp power is maintained constant power of the power value P low, after a predetermined time Performs constant power control of the power supply unit so that the lamp power maintains the rated lamp power value Pr, and the current value Ib and the power value P low are Ia ⁇ 0.7 ⁇ Ib ⁇ Ia ⁇ 0.9 Pr ⁇ 0.5 ⁇ P low ⁇ Pr ⁇ 0.9 It is characterized by satisfying the relationship.
- a constant current having a current value Ib that satisfies the following relationship is supplied to the high pressure discharge lamp.
- a constant power of a predetermined power value P low that is lower than the rated lamp power value Pr and satisfies the following relationship is supplied to the high pressure discharge lamp.
- the lamp current is controlled so as to be equal to or less than the limit current value Ia, and even if the lamp voltage decreases too much, the lamp current Will not grow excessively.
- the lighting method of the high-pressure discharge lamp having the above configuration can obtain the same effects as those of the high-pressure discharge lamp lighting device.
- ADVANTAGE OF THE INVENTION it suppresses that a pair of electrode in a high pressure discharge lamp wears out conventionally, and can suppress that the start-up of a lamp becomes late, and a high pressure discharge lamp using the same It is possible to provide a device, a projector using the high pressure discharge lamp device, and a lighting method of the high pressure discharge lamp.
- FIG. 1 It is a block diagram which shows the structure of the high pressure discharge lamp apparatus which concerns on 1st Embodiment. It is sectional drawing containing the pipe axis which shows the structure of a high pressure mercury lamp. It is a partially notched perspective view which shows the structure of the lamp unit incorporating the high pressure mercury lamp. It is a flowchart for demonstrating operation
- (A) is a graph showing the relationship between the lamp voltage and lamp current until the lamp rises for Example 1 and the lighting time, and (b) is the lamp voltage until the lamp for Example 2 starts up.
- (c) is a graph showing the relationship between the lamp voltage and lamp current until the lamp is started up and the lighting time for Example 3
- (c) is a graph showing the relationship between the lamp current and the lighting time.
- d) is a graph showing the relationship between the lamp voltage and lamp current until the lamp rises for Example 4 and the lighting time
- (e) is a graph showing the lamp voltage and lamp current until the lamp rises for Example 5. It is a graph which shows the relationship between a lamp electric current and lighting time
- (f) is a lamp voltage and lamp electric power until the lamp about Comparative Example 1 starts.
- (g) includes the lamp voltage and the lamp current to the lamp rises for Comparative Example 2 is a graph showing the relationship between the lighting time.
- (A) is a figure which shows transition of the lamp voltage of each Example and a comparative example
- (b) is a figure which shows transition of the illumination intensity maintenance factor of each Example and a comparative example. It is a figure for demonstrating the relationship between an illumination intensity maintenance factor and accumulation lighting time. It is a figure for demonstrating the relationship between electric current value Ib and electric power value Plow . It is a graph which shows each relationship of lamp electric power when it lights with the lighting device which concerns on 2nd Embodiment, and lighting time.
- FIG. 1 It is a partially cutaway perspective view showing a configuration of a front projector according to a third embodiment. It is a perspective view which shows the structure of the rear projector which concerns on 3rd Embodiment.
- A is a graph which shows the relationship between the lamp electric power and lighting time when it lights with the conventional lighting device
- (b) is the relationship between the lamp voltage and lighting time when it lights with the conventional lighting device
- (C) is a graph which shows the relationship between the lamp current and lighting time when it lights with the conventional lighting device.
- FIG. 1 is a block diagram of a high-pressure discharge lamp device 1 according to the first embodiment of the present invention.
- a high-pressure discharge lamp device 1 includes a DC power supply circuit 2 connected to an external AC power supply (AC100 [V]), a high-pressure discharge lamp 4 with a rated lamp power of 200 [W], and the DC
- the lighting device 3 (electronic ballast) is connected between the power supply circuit 2 and the high-pressure discharge lamp 4.
- the DC power supply circuit 2 has, for example, a rectifier circuit, generates a constant DC voltage from a household AC voltage (100 [V]), and supplies it to the lighting device 3.
- the lighting device 3 converts the DC voltage power supplied from the DC power supply circuit 2 into AC power and supplies it to the high-pressure discharge lamp 4.
- the high pressure discharge lamp 4 is lit by AC power supplied from the lighting device 3.
- the lighting device 3 includes a DC / DC converter 5, a DC / AC inverter 6, a high voltage generator 7, and a controller 8 as main components.
- the control unit 8 includes a microcomputer 11, a PWM (Pulse Width Modulation) control circuit 12, a lamp current detection unit 9, a lamp voltage detection unit 10, and a timer 14.
- the DC / DC converter 5 has input terminals 5a and 5b, output terminals 5c and 5d, and a control terminal 5e.
- a DC power supply circuit 2 is connected to the input terminals 5a and 5b.
- a DC / AC inverter 6 is connected to the output terminals 5c and 5d.
- a PWM control circuit 12 is connected to the control terminal 5e.
- the DC / DC converter 5 generates a direct current having a magnitude corresponding to the PWM control signal input to the control terminal 5e using PWM control.
- the DC / AC inverter 6 has input terminals 6a and 6b, output terminals 6c and 6d, and a control terminal 6e.
- a DC / DC converter 5 is connected to the input terminals 6a and 6b.
- a high-pressure discharge lamp 4 is connected to the output terminals 6c and 6d via a high voltage generator 7.
- a microcomputer 11 is connected to the control terminal 6e.
- the DC / AC inverter 6 can generate a substantially rectangular wave alternating current having a frequency corresponding to the frequency of the frequency control signal input to the control terminal 6e. Thereby, the direct current output from the DC / DC converter 5 is converted into a substantially rectangular wave alternating current.
- the “substantially rectangular wave” alternating current includes not only a current that forms a complete rectangular wave but also a rectangular wave that has some distortion due to overshoot or undershoot immediately after polarity inversion.
- a pulse current is superimposed before polarity reversal every half cycle of the rectangular wave, or a slope is added so that the current value increases with time in every half cycle of the rectangular wave.
- An AC waveform is known in which one cycle of high frequency is added immediately before or after polarity inversion for each half cycle of the rectangular wave, and only the lamp current of the latter half cycle of the added waveform is higher than the current value immediately before the addition. ing.
- the “substantially rectangular wave” includes such a deformed shape by superimposing some component on the basic rectangular wave.
- the DC / DC converter 5 and the DC / AC inverter 6 having the above-described configuration function as a power supply unit that converts the DC voltage power from the DC power supply circuit 2 into AC power and supplies the AC voltage to the high-pressure discharge lamp 4.
- the high voltage generator 7 has a transformer, for example, and generates a high voltage when the high pressure discharge lamp 4 is started and applies the high voltage to the high pressure discharge lamp 4 to start discharge.
- transformer is cut
- control unit 8 will be described.
- the lamp current detection unit 9 detects a current (corresponding to the lamp current) flowing in the wiring connecting the DC / DC converter 5 and the DC / AC inverter 6 and outputs a signal indicating the magnitude of the lamp current to the microcomputer 11. .
- the lamp voltage detector 10 detects the output voltage (corresponding to the lamp voltage) of the DC / DC converter 5 and outputs a signal indicating the magnitude of the lamp voltage to the microcomputer 11.
- the output voltage here includes a voltage drop caused by the DC / AC inverter 6, the high voltage generator 7, circuit wiring, and the like. Therefore, although the output voltage of the DC / DC converter 5 is not exactly equivalent to the lamp voltage, the output voltage of the DC / DC converter 5 is used as the lamp voltage in the control process by correcting the voltage drop. Can be handled.
- the microcomputer 11 receives the output signal of the lamp current detection unit 9 and the output signal of the lamp voltage detection unit 10, and obtains a difference value between the current value obtained by calculation so that the lamp power becomes a predetermined power value and the lamp current, or A difference value between the predetermined current value and the lamp current is output to the PWM control circuit 12 so that the lamp current becomes a predetermined current value.
- the microcomputer 11 is set with a limit current value Ia that limits the magnitude of the lamp current in order to prevent the lamp current from becoming excessive. Further, the microcomputer 11 inputs a preset frequency control signal to the DC / AC inverter 6 and controls the frequency of the alternating current supplied to the high-pressure discharge lamp 4.
- the PWM control circuit 12 generates a PWM control signal composed of a duty (ON / OFF switching) pulse based on the difference value from the microcomputer 11.
- the PWM control circuit 12 inputs the generated PWM control signal to the DC / DC converter 5, performs PWM control on the DC / DC converter 5, and controls the magnitude of the current supplied to the high-pressure discharge lamp 4.
- the timer 14 starts measuring time when the lighting of the lamp is detected. The operation of the control unit 8 will be described later. ⁇ Configuration of high-pressure discharge lamp> Next, a schematic configuration of the high-pressure discharge lamp 4 will be described with reference to FIG.
- the high-pressure discharge lamp 4 is, for example, a high-pressure mercury lamp, and includes a light-emitting portion 16 having a substantially spheroid shape and sealing portions 17 a and 17 b provided at both ends of the light-emitting portion 16.
- the arc tube 15 is provided.
- the arc tube 15 is made of, for example, quartz glass.
- mercury (Hg) as a luminescent substance and, for example, argon gas (Ar), krypton gas (Kr), xenon gas (Xe), A predetermined amount of these two or more mixed gases and iodine (I) or bromine (Br) for the halogen cycle, or a mixture thereof are enclosed.
- the enclosed amount of mercury is in the range of 150 [mg / cm 3 ] to 390 [mg / cm 3 ] and the enclosed amount of argon gas (25 ° C.) is 0.01 [MPa] to 1 [MPa].
- the bromine encapsulation amount is in the range of 1 ⁇ 10 ⁇ 10 [mol / cm 3 ] to 1 ⁇ 10 ⁇ 4 [mol / cm 3 ], preferably 1 ⁇ 10 ⁇ 9 [mol / cm 3 ] to 1 ⁇ 10 ⁇ 5 [mol / cm 3 ], respectively.
- a pair of electrodes 19a and 19b are disposed on the substantially same axis so as to face each other.
- the electrodes 19a and 19b are made of tungsten (W) and are electrically connected to the external lead wires 25a and 25b via molybdenum metal foils 24a and 24b hermetically sealed to the sealing portions 17a and 17b. ing.
- the electrode 19a has an electrode rod 20a, an electrode coil attached to one end of the electrode rod 20a, and a substantially hemispherical tip portion 22a formed by melting the electrode rod 20a and a part of the electrode coil. Yes. Further, a protrusion 23a is formed on the tip 22a.
- the electrode 19b has the same configuration as that of the electrode 19a, and a protrusion 23b is formed on the tip 22b. These protrusions 23a and 23b become arc spots between the electrodes 19a and 19b, and the distance D between the protrusions 23a and 23b is an interelectrode distance D.
- the interelectrode distance D is set, for example, within a range of 0.5 [mm] to 2.0 [mm].
- the protrusions 23a and 23b are formed by depositing tungsten evaporated from the electrodes 19a and 19b during the lighting and returning to the electrodes 19a and 19b again by the halogen cycle. Self-formed by testing.
- FIG. 2 shows the shape of the protrusion formed at the time of manufacture, which is a protrusion when the product is completed.
- the shapes of the tip portions 22a and 22b of the electrodes 19a and 19b are not limited to a substantially hemispherical shape, and may be, for example, a substantially spherical shape or a substantially conical shape.
- the tip portions 22a and 22b of the electrodes 19a and 19b in addition to forming a part of the electrode rod and a part of the electrode coil, respectively, for example, approximately hemispherical, approximately spherical or approximately conical in advance. You may attach to the front-end
- ⁇ Configuration of lamp unit> As shown in FIG. 3, such a high-pressure discharge lamp 4 is incorporated in a reflecting mirror 26 to constitute a lamp unit 27.
- the inner surface of the reflecting mirror 26 constitutes a concave reflecting surface 28, in which the high-pressure discharge lamp 4 has a longitudinal center axis X and an optical axis Y of the reflecting mirror 26. Are incorporated so that they substantially match. Thereby, the light emitted from the high-pressure discharge lamp 4 is reflected by the reflecting surface 28, and the light collection efficiency is increased.
- the base of the reflecting mirror 26 is made of, for example, glass or metal.
- the reflecting surface 28 is made of, for example, a spheroid surface, a rotating paraboloid surface, or a free-form surface, and a multilayer interference film or the like is formed by a vapor deposition method or a sputtering method.
- the reflecting mirror 26 is provided with a neck portion 32 having a through hole 32 a that penetrates the bottom portion of the reflecting surface 28.
- a cylindrical base 30 provided with a lighting device connection terminal 29 is attached to one sealing portion 17b of the arc tube of the high-pressure discharge lamp 4.
- An external lead wire (not shown) led out from the sealing portion 17 b is connected to the lighting device connection terminal 29.
- a power supply line 31 for connecting a lighting device is connected to the external lead wire 25a led out from the other sealing portion 17a.
- the base 30 is inserted into the neck portion 32 of the reflecting mirror 26 and fixed with an adhesive 33.
- the power supply line 31 is inserted into a through hole 34 provided in the reflecting mirror 26 and led to the outside of the reflecting mirror 26.
- FIG. 4 is a flowchart showing an example of the operation of the lighting device 3 according to the present embodiment.
- the microcomputer 11 includes, as basic information of the present embodiment, a limited current value Ia (4 [A]), a current value Ib (3.2 [A]), a rated lamp power value Pr of the high-pressure discharge lamp 4 (200 [W ], A power value P low (140 [W]), a predetermined time (90 [s]), and a predetermined voltage Vs (43.75 [V]) are registered.
- a lighting switch not shown
- the microcomputer 11 causes the high voltage generator 7 to supply a high frequency of 3 [kV], 100 [kHz], for example.
- a voltage is generated (S11).
- the microcomputer 11 determines whether or not lighting has started based on the output signal of the lamp current detector 9. If it is determined that the lighting has started (S12: YES), the timer 14 starts time measurement (S13). If it is determined that lighting has not started (S12: NO), the process returns to step S11. (3) Next, the microcomputer 11 performs constant current control based on the current value Ib (3.2 [A]) of the substantially rectangular wave alternating current (S14).
- the microcomputer 11 receives the output signal of the lamp current detector 9 and controls the DC / DC converter 5 via the PWM control circuit 12 so that the lamp current becomes the current value Ib.
- the microcomputer 11 receives the output signal of the lamp voltage detector 10, and whether the lamp voltage has increased with the evaporation of mercury and has reached a predetermined voltage Vs (43.75 [V]). Is determined. If the predetermined voltage Vs has not been reached (S15: NO), the constant current control in S14 is maintained.
- the predetermined voltage Vs is a voltage value when the lamp power becomes a power value P low of S16 described later under constant current control.
- the process proceeds to constant power control with the power value P low (140 [W]) (S16).
- the microcomputer 11 receives the output signal of the lamp current detection unit 9 and the output signal of the lamp voltage detection unit 10, calculates the current value for maintaining the lamp power at the power value P low , and calculates the lamp current.
- the DC / DC converter 5 is controlled via the PWM control circuit 12 so as to obtain the current value.
- the constant power control of S16 is maintained until the measurement time of the timer 14 passes a predetermined time (90 [s]) (S17: NO).
- the predetermined time here may be any time that allows the gas pressure in the lamp to be stable and shifts to steady lighting, and is appropriately selected depending on the lamp specifications and the like.
- the predetermined time is preferably 50 [s] or more, more preferably 70 [s] or more, as the time until the gas pressure in the lamp is stabilized.
- it is preferable that the predetermined time is short from the viewpoint of starting up the lamp. Specifically, 180 [s] or less is preferable, and 120 [s] or less is more preferable. (7) If the measurement time of the timer 14 has passed the predetermined time (S17: YES), the time measurement is stopped (S18), and the process proceeds to constant power control at the rated lamp power value Pr (200 [W]) ( S19).
- the microcomputer 11 receives the output signal of the lamp current detection unit 9 and the output signal of the lamp voltage detection unit 10 and calculates a current value for maintaining the lamp power at the rated lamp power value Pr.
- the DC / DC converter 5 is controlled via the PWM control circuit 12 so that the calculated current value is obtained.
- the constant power control of S19 is maintained until the lighting ends.
- FIGS. 5A to 5C are graphs showing the relationship between the lamp power, the lamp voltage and the lamp current, and the lighting time when the lamp is lit by the above operation.
- the lamp voltage during steady lighting in the high-pressure discharge lamp 4 is 55 [V].
- FIG. 5A shows the high-pressure discharge lamp 4 using the conventional lighting device and the lighting device of Patent Document 1.
- the relationship between the lamp power and the lighting time when is turned on is indicated by a two-dot chain line.
- the rated lamp voltage is the lamp voltage that was confirmed when the product was completed, and means the lamp voltage at the time of steady lighting (when the voltage value is stabilized in the steady lighting state).
- Such a rated lamp voltage varies depending on the inter-electrode distance D, and the inter-electrode distance D is determined by the size of the projections 23a and 23b formed on the electrodes 19a and 19b.
- it is necessary to monitor the state of the protrusion during manufacturing and control the formation of the protrusion, which increases the load of manufacturing management and leads to a decrease in productivity.
- the range in which the variation in rated lamp voltage is allowed is specified, and manufacturing management is performed so that the rated lamp voltage at the time of product completion falls within the specified allowable range. It has been broken. Thereby, it is suppressed that productivity falls.
- the tolerance defined in this way is the tolerance range.
- Such rated lamp voltage and tolerance range are generally described in specifications attached at the time of lamp delivery.
- the current value Ib (3.2 [A]) is constant until the lamp voltage reaches 43.75 [V] from the start of lighting until 90 [s].
- constant power control is performed with a power value P low (140 [W]) lower than the rated lamp power value Pr.
- P low 140 [W]
- Current value is 3.64 [A], which is smaller than the limit current value Ia (4 [A]).
- the current value when shifting to the constant power control of the rated lamp power value Pr becomes smaller than that of the conventional lighting device, the temperature rise of the electrodes 19a and 19b of the high-pressure discharge lamp 4 can be suppressed. It is possible to suppress the wear of 19a and 19b. As a result, the life of the lamp can be extended.
- the temperature of the electrodes 19a and 19b can be once stabilized.
- the temperature rise of the electrodes 19a and 19b when shifting to the constant power control of the lamp power value Pr can be suppressed. Thereby, when it transfers to constant power control of the rated lamp electric power value Pr, it can suppress that electrode 19a, 19b wears out.
- the temperature of the electrodes 19a and 19b is increased by the amount of the current value larger than that of the lighting device of Patent Document 1, and the lamp voltage The rise will be faster. Therefore, it is possible to prevent the ramp from rising quickly and from rising late.
- the lamp voltage has reached 55 [V] and the lamp has started up (steady lighting). I understand).
- ⁇ Setting range of current value Ib and power value P low > In the lighting device 3 according to the present embodiment, the magnitude of the current value Ib satisfies the following range.
- the current value Ib is in the range of 0.7 to 0.9 times the limited current value Ia.
- the reason why the upper limit is set to 0.9 times is that when the current value Ib exceeds 0.9 times the limit current value Ia, the limit current value Ia does not greatly change. Therefore, the electrodes 19a, This is because the effect of suppressing the wear of 19b is small.
- the reason why the lower limit is set to 0.7 times is that the rise of the lamp is slow at a current value Id that is 0.625 times the limit current value Ia, and is therefore larger than the current value Id.
- the power value P low satisfies the following range.
- the reason why the upper limit is 0.9 times is that when the power value P low exceeds 0.9 times the rated lamp power value Pr, the rated lamp power value Pr does not change significantly. This is because the effect of suppressing the temperature rise of the electrodes 19a and 19b when shifting to constant power control is small.
- the reason why the lower limit is set to 0.5 times is that when there is too much difference between the rated lamp power value Pr and the power value P low , the electrodes 19a and 19b are moved to the constant power control of the rated lamp power value Pr. This is because the heat load applied to the abruptly increases and the evaporation of the electrodes 19a and 19b is promoted and worn, resulting in an adverse effect.
- the inventors have performed a lighting test to be described later, and if the current value Ib and the power value P low are each within the above ranges, the pair of electrodes are prevented from being worn out and the lamp life is increased. It was confirmed that it was possible to suppress the slow rise of the lamp. ⁇ Lighting test results> Next, the lighting test result for confirming the effect when the lamp is turned on by the lighting device 3 according to the present embodiment will be described.
- the tolerance range of the rated lamp power value Pr and the rated lamp voltage of each high-pressure discharge lamp 4 is 200 [W] and 50 [V] to 80 [V] described above.
- the lamp voltage during steady lighting of each high-pressure discharge lamp 4 is 55 [V] (cumulative lighting 0 [h]).
- the limiting current value Ia in the lighting device 3 that lights each high-pressure discharge lamp 4 is 4 [A].
- FIG. 6 shows the magnitudes of the current value Ib and the power value P low in Examples 1 to 5 and Comparative Examples 1 and 2.
- Comparative Example 1 and Comparative Example 2 are prepared for comparison with the conventional lighting device and the lighting device of Patent Document 1.
- FIG. 6 shows the determination results for the ramp rise of each example and comparative example.
- FIGS. 7A to 7G are graphs showing the relationship between the lamp voltage and lamp current until the lamp starts up and the lighting time.
- the lamp voltage when 90 [s] has elapsed from the start of lighting is as low as 35 [V]. It is not possible to shift to constant power control of the value Pr. Therefore, after 90 [s] has elapsed, the constant current control of 4.0 [A] is once performed, and after the lamp voltage reaches 50 [V], the control is shifted to the constant power control of the rated lamp power value Pr. Yes.
- the reason why the predetermined time is set to 90 [s] is that, for example, in the case of a lamp used for a small portable projector, the user can start up the lamp in a short time, specifically 90 [s]. This is to satisfy the user's request.
- the lamp voltage is 55 [V] when 90 [s] has elapsed from the start of lighting or immediately after 90 [s] has elapsed. ], And the lamp has started up earlier than time U. Therefore, the rising judgments in Examples 1 to 5 and Comparative Example 1 are all “ ⁇ ”.
- FIG. 8 (a) is a diagram showing the transition of the lamp voltage in each example and comparative example.
- Examples 1 to 5 are each less than 80 [V], whereas Comparative Examples 1 and 2 are It exceeds 80 [V].
- the current value Ib of Comparative Example 1 is larger than that of Examples 1 to 5, the temperature of the electrodes 19a and 19b of the high-pressure discharge lamp 4 is increased and wear increases, and the interelectrode distance D increases. Conceivable.
- the current value Ib is 1.78 [A], which is smaller than those of Examples 1 to 5, but constant current control of 4.0 [A] is performed after 90 [s] has elapsed.
- Example 3 the lamp voltage in Example 3 is the lowest of 60 [V], and the wear of the electrodes 19a and 19b can be suppressed most.
- the reason why the lamp voltage is higher in the first and second embodiments than in the third embodiment is that the wear of the electrodes 19a and 19b is increased by the amount the current value Ib is larger than that in the third embodiment.
- the current values Ib of Examples 4 and 5 were smaller than those of Example 3, the lamp voltage became higher after 90 [s] as shown in FIGS. 7 (d) and (e). Since the lamp voltage at that time is less than 55 [V], when shifting to the constant power control of the rated lamp power value Pr, a current larger than that in Example 3 (3.64 [A]) is temporarily supplied. (3.77 [A] and 3.84 [A]).
- Example 1 and Example 2 of the same current value Ib are compared, the lamp voltage of Example 1 having a large power value P low is high.
- the power value P low of the first embodiment is 180 [W], which is close to the rated lamp power value Pr, and when the constant power control of the rated lamp power value Pr is started, the temperature of the electrodes 19a and 19b is already high. This is considered to be because the effect of suppressing the wear of the electrodes 19a and 19b is reduced when the constant power control of the power value P low is included.
- Example 4 and Example 5 having the same current value Ib are compared, the lamp voltage of Example 5 having a small power value P low is high.
- FIG. 8B is a diagram showing the transition of the illuminance maintenance rate of each example and comparative example.
- the illuminance of each high-pressure discharge lamp 4 at the aging start time (cumulative lighting time 0 [h]) is set as a reference (100 [%]), and the illuminance maintenance rate at the aging end time (cumulative lighting time 1050 [h]). was measured.
- FIG. 9 is a diagram in which the illuminance maintenance ratio [%] is plotted on the vertical axis and the cumulative lighting time [h] is plotted on the horizontal axis, and the illuminance maintenance ratio in FIG. 8B is plotted.
- transition lines of Examples 1 to 5 and Comparative Examples 1 and 2 are indicated by 51 to 57, respectively.
- the transition line 53 is Example 3
- the transition line 52 is Example 2
- the transition line 51 is Example 1.
- transition line 57 indicates Comparative Example 2
- transition line 56 indicates Comparative Example 1.
- the transition of the illuminance maintenance rate after the cumulative lighting time 1050 [h] is predicted based on the transition of the illuminance maintenance rate up to the cumulative lighting time 1050 [h], and the predicted transition is a broken line. It is shown in
- FIG. 8B shows a predicted lamp life value determined from the transition of the illuminance maintenance rate predicted in FIG.
- the illuminance maintenance rate of 50 [%] is used as a criterion for determining lamp life.
- the transition (prediction) of the illuminance maintenance rate of Example 3 is up to 70 [%], but according to the calculation, the lamp life of Example 3 is predicted to be 5000 [h]. .
- the life judgment of Example 3 is the best “ ⁇ ”.
- the lamp lifetimes of Examples 1 to 5 are all 2000 [h] or longer, and the lifetime judgment is good “ ⁇ ” or the best “ ⁇ ”, whereas the lamp lifetimes of Comparative Examples 1 and 2 are 2000 It is less than [h], and the life determination is defective “x”.
- Examples 1 to 5 can prevent the electrodes 19a and 19b from being worn more than Comparative Examples 1 and 2, and can extend the life of the lamp.
- FIG. 10 is a diagram in which the current value Ib and the power value P low of Examples 1 to 5 and Comparative Examples 1 and 2 are plotted with the vertical axis representing power [W] and the horizontal axis representing current [A].
- the current value Ib in Examples 1 to 5 is in the range of 2.8 [A] to 3.6 [A], and the power value P low is 100 [W] to 180. [W] Within the following range.
- the current value Ib can be expressed by the following relational expression using the limited current value Ia (4 [A]).
- the power value P low can be expressed by the following relational expression using the rated lamp power value Pr (200 [W]).
- FIG. 11 is a graph showing the relationship between lamp power and lighting time when the high-pressure discharge lamp 4 is lit using the lighting device 3 according to the second embodiment.
- the constant current control of the current value Ib (3.2 [A]) and the power value P low (140 [W]) are performed. It is common to the lighting device 3 according to the first embodiment in that constant power control and constant power control of the rated lamp power value Pr (200 [W]) are performed (see FIG. 5).
- the lamp power is increased at a stroke from the power value P low to the rated lamp power value Pr, whereas in the lighting device 3 according to the second embodiment, The difference is that the lamp power is increased stepwise to the rated lamp power value Pr. Specifically, the lamp power is increased from 140 [W] to 200 [W] through six stages. In this example, the stages of 150 [W], 160 [W], 170 [W], 180 [W], and 190 [W] have been passed by 200 [W].
- the temperature of the electrodes 19a, 19b of the high-pressure discharge lamp 4 can be raised stepwise, so that the lamp power can be increased as compared with the case where the lamp power is raised at once.
- the temperature rise of the electrodes 19a and 19b can be suppressed.
- the illuminance of the lamp can be suppressed from changing suddenly, there is an advantage that the illuminance change at the start-up becomes moderate, for example, when the high-pressure discharge lamp 4 is used in a projector.
- the description is abbreviate
- the lamp power is increased stepwise until the time from the start of lighting passes a predetermined time (90 [s] in this example) after constant power control of the power value P low. Done during. This is an operation performed after S16 and before S17 as viewed in FIG. 4 of the first embodiment.
- a predetermined voltage value for example, 50 [V]
- P low 140 [W]
- This time interval T2 is a time interval for sequentially switching the lamp power to the above five power values.
- the microcomputer 11 first sets 150 [W] to the target value of the lamp power, and performs power control with the set target value (150 [W]) of the lamp power.
- the microcomputer 11 receives the output signal of the lamp current detection unit 9 and the output signal of the lamp voltage detection unit 10, calculates the current value for setting the lamp power to 150 [W], and the lamp current is calculated.
- the DC / DC converter 5 is controlled via the PWM control circuit 12 so as to obtain a current value.
- the microcomputer 11 is switched by sequentially switching the target value of the lamp power to 160 [W], 170 [W], 180 [W], and 190 [W] at each time interval T2.
- the microcomputer 11 functions as power switching means for sequentially switching the lamp power. (4) If the measurement time of the timer 14 has passed 90 [s], the microcomputer 11 shifts to constant power control at the rated lamp power value Pr, and thereafter performs the same operation as in the first embodiment.
- the configuration in which the lamp power is increased in six steps in a stepwise manner from the power value P low to the rated lamp power value Pr is not limited to this, but is less than five steps or seven steps. It is good also as above.
- the lamp power is increased in 20 steps from 10 steps and 30 steps from 20 steps until the lamp power is changed from the power value P low to the rated lamp power value Pr. This is more preferable because the change in the illuminance of the lamp can be made more gradual.
- the number of steps from which the lamp power is raised to the rated lamp power value Pr from the power value P low can be appropriately selected according to the lamp specifications and the like.
- FIG. 12 is a perspective view showing a schematic configuration of the front projector 35.
- the front projector 35 is a type of projector that projects an image toward a screen (not shown) installed in front of the front projector 35, and includes the lamp unit 27 having the high-pressure discharge lamp 4 in the above embodiment as a light source. .
- the front projector 35 further includes an optical unit 37, a control unit 38, a projection lens 39, a cooling fan unit 40, a power supply unit 41, and the like housed in a housing 36.
- the power supply unit 41 includes the lighting device 3 described above, and converts the power supplied from the commercial power source into power suitable for the control unit 38 and the lamp unit 27 and supplies the converted power. In this way, by lighting the high-pressure discharge lamp 4 with the lighting device 3, it is possible to suppress the wear of the electrodes 19a and 19b of the high-pressure discharge lamp 4 and to extend the life of the lamp. The maintenance load on the projector 35 can be reduced.
- the top plate of the housing 36 is removed in order to make the configuration of the front projector 35 easier to see.
- FIG. 13 is a perspective view showing a schematic configuration of the rear projector 42.
- the rear projector 42 has a configuration in which a lamp unit 27, an optical unit, a projection lens, a mirror, a lighting device 3 (all not shown) for supplying power to a high-pressure discharge lamp, and the like are housed in a housing 43. Yes.
- the image projected from the projection lens and reflected by the mirror is projected from the back side of the transmissive screen 44 and displayed as an image.
- the lighting device 3 by lighting the high-pressure discharge lamp 4 with the lighting device 3, it is possible to prevent the electrodes 19a and 19b of the high-pressure discharge lamp 4 from being worn and to extend the life of the lamp. Therefore, the maintenance load on the rear projector 42 can be reduced.
- the high-pressure discharge lamp lighting device As described above, the high-pressure discharge lamp lighting device according to the present invention, the high-pressure discharge lamp device using the same, the projector using the high-pressure discharge lamp device, and the lighting method of the high-pressure discharge lamp have been described based on the embodiments. The invention is not limited to these embodiments. For example, the following modifications can be considered.
- the constant current control with the current value Ib is performed immediately after the start of lighting, but before the constant current control with this current value Ib, for example, a warm-up period for stabilizing the discharge is provided. It may be provided.
- a warm-up period for example, by performing constant current control of a high-frequency current selected from a range of 1 [kHz] to 500 [kHz] for 2 [s], the discharge is stabilized. Can do.
- a known direct current operation or a constant current control operation with a low frequency current of less than 1 [kHz] may be used instead of the constant current control of the high frequency current.
- a constant current control with a current larger than the current value Ib may be performed before the constant current control of the current value Ib.
- the lamp voltage is less than 27 [V]
- the temperature of the electrodes 19a and 19b of the high-pressure discharge lamp 4 is low, and the electrodes 19a and 19b are not easily worn even if the current value is increased.
- the ramp can be started quickly by increasing the value.
- the present invention can be widely used for a high-pressure discharge lamp device, a projector using the high-pressure discharge lamp device, and the like.
Landscapes
- Circuit Arrangements For Discharge Lamps (AREA)
Abstract
Description
Ia×0.7 ≦ Ib ≦ Ia×0.9
Pr×0.5 ≦ Plow ≦ Pr×0.9
の関係を満たすことを特徴とする。
Ia×0.7 ≦ Ib ≦ Ia×0.9
Pr×0.5 ≦ Plow ≦ Pr×0.9
の関係を満たすことを特徴とする。
このように、電流値Ibが、制限電流値Iaの0.7倍~0.9倍の大きさに設定されるので、上記従来の点灯装置における電流値Ic(=制限電流値Ia)よりも小さくなり、かつ電流値Idよりも大きくなる。これにより、上記従来の点灯装置よりも、一対の電極の温度上昇を抑えることができ、電極が損耗するのを抑制することができる。また、上記特許文献1の点灯装置よりも、ランプの立ち上がりが早くなり、ランプの立ち上がりが遅くなるのを抑えることができる。
これにより、所定時間の経過後における定格ランプ電力値Prの定電力供給に移行する前に、一対の電極の温度上昇を抑えて安定させることができるので、点灯開始から所定時間の経過するまで、一対の電極の温度が一気に上昇するのを防止している。この結果、電極が損耗するのをより抑制することができる。
[第1の実施形態]
<全体構成>
図1は、本発明の第1の実施形態である高圧放電ランプ装置1のブロック図を示す。
図1に示すように、高圧放電ランプ装置1は、外部の交流電源(AC100[V])に接続されるDC電源回路2と、定格ランプ電力200[W]の高圧放電ランプ4と、これらDC電源回路2と高圧放電ランプ4との間に接続された点灯装置3(電子安定器)とで構成されている。
<点灯装置の構成>
点灯装置3は、主な構成として、DC/DCコンバータ5、DC/ACインバータ6、高電圧発生部7および制御部8を備えている。制御部8は、マイコン11、PWM(Pulse Width Modulation)制御回路12、ランプ電流検出部9、ランプ電圧検出部10およびタイマー14を備えている。
<高圧放電ランプの構成>
次に、高圧放電ランプ4の概略構成について図2を参照して説明する。
<ランプユニットの構成>
このような高圧放電ランプ4は、図3に示すように、反射鏡26内に組み込まれてランプユニット27を構成する。
<点灯装置の動作>
図4は、本実施形態に係る点灯装置3の動作の一例を示すフローチャートである。
(1)高圧放電ランプ4を放電開始させるための点灯スイッチ(図示せず)がオンされると、マイコン11は、高電圧発生部7に例えば3[kV]、100[kHz]の高周波の高電圧を発生させる(S11)。この高周波の高電圧が高圧放電ランプ4に印加されることにより、電極19a,19b間において絶縁破壊が起こり、放電が開始(点灯開始)される。
(2)マイコン11は、ランプ電流検出部9の出力信号に基づき点灯開始したか否かを判別する。点灯開始と判別すれば(S12:YES)、タイマー14の時間計測をスタートさせる(S13)。点灯開始していないと判別すれば(S12:NO)、S11のステップに戻る。
(3)次に、マイコン11は、略矩形波の交流電流の電流値Ib(3.2[A])による定電流制御を行う(S14)。ここで、マイコン11は、ランプ電流検出部9の出力信号を受けて、ランプ電流が電流値Ibになるように、PWM制御回路12を介してDC/DCコンバータ5を制御している。
(4)マイコン11は、ランプ電圧検出部10の出力信号を受けて、ランプ電圧が水銀の蒸発に伴って上昇して、所定の電圧Vs(43.75[V])に到達したか否かを判別する。所定の電圧Vsに到達していなければ(S15:NO)、S14の定電流制御を維持する。なお、所定の電圧Vsは、ランプ電力が、定電流制御のもとで後述するS16の電力値Plowになるときの電圧値である。
(5)ランプ電圧が所定の電圧Vsに到達すれば(S15:YES)、電力値Plow(140[W])での定電力制御に移行する(S16)。ここで、マイコン11は、ランプ電流検出部9の出力信号、ランプ電圧検出部10の出力信号を受けて、ランプ電力を電力値Plowに維持するための電流値を算出し、ランプ電流が算出した電流値になるように、PWM制御回路12を介してDC/DCコンバータ5を制御している。
(6)タイマー14の計測時間が所定時間(90[s])を経過するまで(S17:NO)、S16の定電力制御を維持する。ここでの所定時間は、ランプ内のガス圧が安定した状態になって定常点灯に移行できる時間であればよく、ランプの仕様等により適宜選択される。例えば、所定時間は、ランプ内のガス圧が安定するまでの時間として、50[s]以上が好ましく、より好ましくは70[s]以上が好ましい。なお、ランプの立ち上げの観点から所定時間は短い方が好ましい。具体的には、180[s]以下が好ましく、より好ましくは120[s]以下が好ましい。
(7)タイマー14の計測時間が所定時間を経過すれば(S17:YES)、時間計測をストップ(S18)し、定格ランプ電力値Pr(200[W])での定電力制御に移行する(S19)。ここで、マイコン11は、ランプ電流検出部9の出力信号、ランプ電圧検出部10の出力信号を受けて、ランプ電力を定格ランプ電力値Prに維持するための電流値を算出し、ランプ電流が算出した電流値になるように、PWM制御回路12を介してDC/DCコンバータ5を制御している。点灯終了までS19の定電力制御を維持する。
<作用効果>
図5(a)~(c)は、上記動作により点灯したときのランプ電力、ランプ電圧およびランプ電流と、点灯時間との各関係を示すグラフである。
<電流値Ibおよび電力値Plowの設定範囲>
本実施形態に係る点灯装置3において、電流値Ibの大きさは、以下の範囲を満たす。
したがって、電流値Ibは、制限電流値Iaの0.7倍~0.9倍の範囲内といえる。ここで、上限を0.9倍とした理由は、電流値Ibが、制限電流値Iaの0.9倍を超えると、制限電流値Iaと大きく変わらないので、高圧放電ランプ4の電極19a,19bが損耗するのを抑制する効果が小さいからである。下限を0.7倍とした理由は、制限電流値Iaの0.625倍となる電流値Idではランプの立ち上がりが遅いので、この電流値Idよりも大きくするためである。
ここで、上限を0.9倍とした理由は、電力値Plowが、定格ランプ電力値Prの0.9倍を超えると、定格ランプ電力値Prと大きく変わらないので、定格ランプ電力値Prの定電力制御に移行したときの電極19a,19bの温度上昇を抑制する効果が小さいからである。下限を0.5倍とした理由は、定格ランプ電力値Prと電力値Plowとの大きさに差があり過ぎると、定格ランプ電力値Prの定電力制御への移行によって、電極19a,19bに与える熱負荷が急激に増すために、電極19a,19bの蒸発が促進されて損耗し、逆効果となるからである。
<点灯試験結果>
次に、本実施形態に係る点灯装置3によりランプを点灯したときの作用効果を確認するための点灯試験結果について説明する。
(ランプの立ち上がりの判定)
図6には、各実施例および比較例のランプの立ち上がりについての判定結果が示されている。図7(a)~(g)は、ランプが立ち上がるまでのランプ電圧およびランプ電流と、点灯時間との関係を示すグラフである。
(電極の損耗抑制効果およびランプ寿命の判定)
次に、各実施例および比較例のエージングの実施結果について説明する。
電力値Plowは、定格ランプ電力値Pr(200[W])を用いて、次の関係式で表すことができる。
したがって、電流値Ibおよび電力値Plowが、上記範囲内であれば、従来よりも一対の電極が損耗するのを抑制して、ランプの長寿命化が図れるとともに、ランプの立ち上がりが遅くなるのを抑えることができる効果が得られる。
[第2の実施形態]
図11は、第2の実施形態に係る点灯装置3を用いて、高圧放電ランプ4を点灯したときのランプ電力と、点灯時間との各関係を示すグラフである。
(1)マイコン11は、電力値Plow(140[W])の定電力制御のもとで、ランプ電圧が、所定の電圧値(例えば、50[V])に到達すれば、タイマー14の計測時間より、点灯開始から所定時間(90[s])が経過するまでの残りの時間T1を算出し、算出した時間T1から、さらに、時間間隔T2(=T1/5)を算出する。この時間間隔T2が、ランプ電力を上記5つの電力値に順次切替える時間間隔である。
(2)そして、マイコン11は、先ず、ランプ電力の目標値に、150[W]を設定し、設定されたランプ電力の目標値(150[W])での電力制御を行う。ここで、マイコン11は、ランプ電流検出部9の出力信号、ランプ電圧検出部10の出力信号を受けて、ランプ電力を150[W]にするための電流値を算出し、ランプ電流が算出した電流値になるように、PWM制御回路12を介してDC/DCコンバータ5を制御する。
(3)以降、マイコン11は、時間間隔T2毎に、ランプ電力の目標値を、160[W],170[W],180[W],190[W]へと順に切替えて、切替えられたランプ電力の目標値で電力制御を行う。このように、マイコン11は、ランプ電力を順次切替える電力切替手段として機能する。
(4)タイマー14の計測時間が90[s]を経過すれば、マイコン11は、定格ランプ電力値Prでの定電力制御に移行し、その後は、第1の実施形態と同じ動作となる。
<プロジェクタ>
次に、第3の実施形態に係るプロジェクタについて、図12および図13を参照して説明する。
例えば、以下のような変形例が考えられる。
<変形例>
(1)上記実施形態では、点灯開始後、直ぐに電流値Ibによる定電流制御を行っているが、この電流値Ibの定電流制御の前に、例えば、放電を安定させるためのウォームアップ期間を設けてもよい。具体的には、ウォームアップ期間として、例えば2[s]間、1[kHz]以上500[kHz]以下の範囲内から選択される高周波電流の定電流制御を行うことにより、放電を安定させることができる。なお、ウォームアップ期間において、高周波電流の定電流制御に代えて、公知の直流動作または1[kHz]未満の低周波電流による定電流制御の動作を用いてもよい。
(2)また、電流値Ibの定電流制御の前に、電流値Ibよりも大きい電流による定電流制御を行う構成とすることもできる。特に、ランプ電圧が27[V]未満であれば、高圧放電ランプ4の電極19a,19bの温度は低い状態であるので、電流値を大きくしても電極19a,19bが損耗しにくいので、電流値を大きくすることによってランプの立ち上げを早くできる利点がある。
(3)上記実施形態では、高圧放電ランプ4を放電開始させるため、高電圧発生部7から高周波の高電圧を出力させる構成を示したが、これに限定されるものでなく、公知の間欠発振型の高電圧パルスを用いてもよい。
(4)上記実施形態では、電力値Plowの定電力制御に切り替えるタイミングを、ランプ電圧が43.75[V]に到達したか否かで判断する構成を示したが、ランプ電力が140[W]に到達するか否かで判断してもよい。
(5)上記各実施形態では、高圧放電ランプ4として定格ランプ電力200[W]の高圧水銀ランプを用いた場合について説明したが、これに限らず定格ランプ電力が例えば80[W]以上1000[W]以下の範囲内の高圧水銀ランプを用いた場合でも上記と同様の作用効果を得ることができる。
(6)上記各実施形態では、高圧放電ランプ4として具体的に高圧水銀ランプを用いた場合について説明したが、これに限らず公知のショートアーク型のメタルハライドランプ等を用いた場合でも上記と同様の作用効果を得ることができる。
2 DC電源回路
3 点灯装置
4 高圧放電ランプ
5 DC/DCコンバータ
6 DC/ACインバータ
7 高電圧発生部
8 制御部
9 ランプ電流検出部
10 ランプ電圧検出部
11 マイコン
12 PWM制御回路
14 タイマー
15 発光管
16 発光部
19a,19b 電極
23a,23b 突起部
26 反射鏡
35 フロントプロジェクタ
42 リアプロジェクタ
Claims (7)
- 内部に、発光物質が封入され、かつ一対の電極が対向配置されている発光管を有する高圧放電ランプを点灯させる高圧放電ランプ点灯装置であって、
前記高圧放電ランプに電力を供給する電力供給部と、
ランプ電力が定電力を維持するよう前記電力供給部を制御する定電力制御、およびランプ電流が定電流を維持するよう前記電力供給部を制御する定電流制御を選択的に行い、前記定電力制御のもとでは、ランプ電流が制限電流値Ia以下になるよう前記電力供給部を制御する制御部とを備え、
前記制御部は、
点灯開始から所定時間が経過するまで、
少なくとも、ランプ電流が、前記制限電流値Iaよりも小さい所定の電流値Ibを維持するよう前記電力供給部を制御する定電流制御と、前記定電流制御のもとでランプ電力が定格ランプ電力値Prよりも低い所定の電力値Plowに到達したときに、ランプ電力が電力値Plowの定電力を維持するよう前記電力供給部を制御する第1の定電力制御とを行い、
前記所定時間の経過後は、
ランプ電力が定格ランプ電力値Prを維持するよう前記電力供給部を制御する第2の定電力制御を行い、
前記電流値Ibおよび前記電力値Plowが、
Ia×0.7 ≦ Ib ≦ Ia×0.9
Pr×0.5 ≦ Plow ≦ Pr×0.9
の関係を満たす
ことを特徴とする高圧放電ランプ点灯装置。 - 前記制御部は、
前記第1の定電力制御を前記所定時間が経過するまで行う
ことを特徴とする請求項1に記載の高圧放電ランプ点灯装置。 - 前記制御部は、さらに、
点灯開始から所定時間が経過するまでに、
前記電力値Plowの定電力制御の後に、ランプ電力が電力値Plowから定格ランプ電力値Prまで階段状に上昇するよう前記電力供給部を制御する
ことを特徴とする請求項1に記載の高圧放電ランプ点灯装置。 - 前記制御部は、
電力値Plowよりも高く定格ランプ電力値Prよりも低い、値の異なる複数の電力値が登録されたメモリ部と、
前記複数の電力値の中の低い電力値からランプ電力の目標値を順次選択して切替えるとともに、ランプ電力がランプ電力の目標値になるように前記電力供給部を制御する電力切替手段とを有している
ことを特徴とする請求項3に記載の高圧放電ランプ点灯装置。 - 内部に、発光物質が封入され、かつ一対の電極が対向配置されている発光管を有する高圧放電ランプと、
前記高圧放電ランプを点灯させる請求項1に記載された高圧放電ランプ点灯装置と、
を備えたことを特徴とする高圧放電ランプ装置。 - 請求項5に記載された高圧放電ランプ装置を備えたことを特徴とするプロジェクタ。
- 内部に、発光物質が封入され、かつ一対の電極が対向配置されている発光管を有する高圧放電ランプに対して電力を供給する電力供給部と、ランプ電力が定電力を維持するよう前記電力供給部を制御する定電力制御、およびランプ電流が定電流を維持するよう前記電力供給部を制御する定電流制御を選択的に行い、前記定電力制御のもとでは、ランプ電流が制限電流値Ia以下になるよう前記電力供給部を制御する制御部とを備えた点灯装置による高圧放電ランプの点灯方法であって、
前記制御部が、
点灯開始から所定時間が経過するまで、
少なくとも、ランプ電流が、前記制限電流値Iaよりも小さい所定の電流値Ibを維持するよう前記電力供給部を定電力制御するステップと、ランプ電力が定格ランプ電力値Prよりも低い所定の電力値Plowに到達したときに、ランプ電力が電力値Plowの定電力を維持するよう前記電力供給部を定電力制御するステップと、
前記所定時間の経過後は、
ランプ電力が定格ランプ電力値Prを維持するよう前記電力供給部を定電力制御するステップとを実行し、
前記電流値Ibおよび前記電力値Plowが、
Ia×0.7 ≦ Ib ≦ Ia×0.9
Pr×0.5 ≦ Plow ≦ Pr×0.9
の関係を満たす
ことを特徴とする高圧放電ランプの点灯方法。
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US13/202,539 US9030130B2 (en) | 2010-05-06 | 2011-01-17 | High-pressure discharge lamp lighting device, high-pressure discharge lamp device using the same, projector using the high-pressure discharge lamp device, and lighting method for high-pressure discharge lamp |
JP2012513761A JP5347065B2 (ja) | 2010-05-06 | 2011-01-17 | 高圧放電ランプ点灯装置、それを用いた高圧放電ランプ装置、その高圧放電ランプ装置を用いたプロジェクタ、および高圧放電ランプの点灯方法 |
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