JP4645860B2 - High pressure discharge lamp lighting device, projector and lighting method of high pressure discharge lamp - Google Patents

Description

  The present invention relates to an improvement of a high-pressure discharge lamp lighting device for lighting a high-pressure discharge lamp, and more particularly to control of rising after the lamp is started.

In general, a high pressure discharge lamp is used for a projector, and a constant power control for keeping the lamp power constant is used in a high pressure discharge lamp lighting device that lights the high pressure discharge lamp. As shown in FIG. 12, in general, the lamp voltage of the high-pressure discharge lamp gradually increases from the start of lighting, and after several minutes to several tens of minutes, the lamp voltage becomes constant and reaches stable lighting. If constant power control is performed during this rising period, that is, a period when the lamp voltage is low, the current will naturally be excessive. Therefore, in a normal lighting device, the lamp current should be kept constant before reaching the rated lighting (stable lighting). The constant current control to maintain is performed (for example, patent document 1). Specifically, as shown in FIG. 13, when the lower limit of the rated lamp voltage is V ₀ (for example, 55 V), constant current control (constant I ₀ ) is performed when the lamp voltage is less than V ₀ , and when V ₀ or more, Constant power control (constant P ₀ ) is performed.

By the way, in the high pressure discharge lamp, tungsten is deposited on the tip of the electrode due to the halogen cycle during lighting, and a protrusion is formed. The presence of this protrusion stabilizes the arc discharge, stabilizes the lamp voltage, and maintains the illuminance.
Patent No. 2942113

  However, the lamp voltage may rise sharply during the period until stable lighting is reached. If there is a steep rise in lamp voltage during constant current control, the lamp power also rises rapidly with the rise. Due to the rapid increase in lamp power, the collision load of electrons applied to the electrode tip protrusions in the arc tube rapidly increases.

In particular, at the point where the constant current control is switched to the constant power control, both the lamp current value and the lamp power value are high and become P ₀ and I ₀ (hereinafter, the point is referred to as “P ₀ I ₀ point”). When the lamp lighting state passes near the point P ₀ I _0, the number of collision loads of electrons applied to the electrode tip protrusions in the arc tube increases, resulting in wear of the electrode tip protrusions, thereby causing a distance between the electrodes. Becomes longer and the lamp voltage further increases.
With respect to those lamp operating time of the initial, as shown in FIG. 9, but projections on both the electrode tip is made, by passing near P ₀ I ₀ points above, applied to the electrode tip protrusion in the arc tube The number of electron impact loads increases, and the protrusions at the electrode tips wear out and disappear as shown in FIG. If the lighting is continued with the electrode tip protrusion worn out, the temperature distribution of the bulb portion becomes non-uniform, and a plurality of fine protrusions appear at the electrode tip, resulting in a rough electrode surface.

  In addition, the tungsten scattered from the electrode in the process where the protrusion at the electrode tip disappears or the electrode tip becomes rough adheres to the inner surface of the bulb, and the temperature retention of the bulb increases due to the heat retention effect of the attached tungsten. Is even more striking.

In summary, a rapid rise in lamp voltage results in a temperature rise in the electrode or bulb, and this rises in a vicious circle in which the rise in lamp voltage is accelerated. Therefore, with respect to the electrodes, the electrode tip protrusions are worn, causing flickering and a decrease in illuminance, and with respect to the bulbs, the bulbs are blackened, clouded, deformed, etc., leading to a short lamp life.
Further, if the set current value in the constant current control is lowered in order to avoid wear, the rise of the lamp is delayed although there is an effect of suppressing wear.

  An object of the present invention is to solve the above-mentioned problems and control the power at the time of lamp startup to suppress wear of electrode tip protrusions of a high-pressure discharge lamp without delaying the rise of luminous flux.

A first aspect of the present invention is a power supply means for supplying AC power to a high pressure discharge lamp, a detection means for detecting or calculating a lamp voltage, a lamp current and lamp power of the high pressure discharge lamp, and a detection or calculation result of the detection means. A high pressure discharge lamp lighting device comprising a controller for controlling the power supply means based on the constant power control means for matching the lamp power with a constant set reference power, and the lamp current with a constant set reference Constant current control means for matching the current is provided, and after reaching the stable lighting of the high pressure discharge lamp, the constant current control means is operated when the lamp voltage is less than V ₀ , and when the lamp voltage is V ₀ or more, the rated lamp The constant power control means is configured to operate by applying a set reference power equal to the power, and during the start-up period from the start of the high-pressure discharge lamp to the stable lighting, But when the lamp voltage _{V 1 (V 1 <V 0} ) below to operate the constant current control means constant power by applying the set reference power-rated lamp power when the lamp voltage exceeds a V ₁ When the control means is operated and the lamp voltage exceeds V ₁₁ (V ₀ <V ₁₁ ), the high-voltage discharge lamp is configured to operate the constant power control means by applying a set reference power equal to the rated lamp power. Device.
With this configuration, P ₀ I ₀ point points can be reliably avoided.

According to a second aspect of the present invention, there is provided power supply means for supplying AC power to a high pressure discharge lamp, detection means for detecting or calculating a lamp voltage, lamp current and lamp power of the high pressure discharge lamp, and detection or calculation results of the detection means. A high pressure discharge lamp lighting device comprising a controller for controlling the power supply means based on the constant power control means for matching the lamp power with a constant set reference power, and the lamp current with a constant set reference comprises a constant-current control means for matching the current in the rising period from when starting the high pressure discharge lamp until a stable lighting, when the lamp voltage of V ₁ or less to operate the constant current control means, the lamp voltage equal setting groups to the rated lamp power when the time exceeds the V ₁ was to operate the constant power control means to apply the set reference power-rated lamp power, it has reached a predetermined lighting conditions By applying the electric power is high pressure discharge lamp lighting device configured to operate the constant power control means.
With this configuration, it is possible to avoid a rapid increase in lamp power accompanying a rapid increase in lamp voltage.

In the second aspect, the predetermined lighting condition is that the lamp voltage exceeds V ₁₁ (V ₁ <V ₁₁ ) or the elapsed time after the lamp voltage exceeds V ₁ exceeds a predetermined value. It was decided.
Here, after the stable lighting of the high pressure discharge lamp, the control means further operates the constant current control means when V ₁ <V ₀ <V ₁₁ and the lamp voltage is less than V ₀ , and the lamp voltage When V is greater than or equal to V _0, the constant power control means is operated by applying a set reference power equal to the rated lamp power.

According to a third aspect of the present invention, there is provided power supply means for supplying AC power to a high pressure discharge lamp, detection means for detecting or calculating a lamp voltage, lamp current and lamp power of the high pressure discharge lamp, and detection or calculation results of the detection means. A high pressure discharge lamp lighting device comprising a control unit for controlling the power supply means based on the control means, the control means comprising constant power control means for matching the lamp power to a predetermined set reference power, and starting the high pressure discharge lamp. When the lamp voltage is in a predetermined lamp voltage range (V _{1 to} V ₁₁ ) during the rising period from when the lamp reaches stable lighting, the set reference power is less than the rated lamp power and is outside the predetermined lamp voltage range. Sometimes the high-pressure discharge lamp lighting device is configured so that the set reference power is the rated lamp power.

  According to a fourth aspect of the present invention, there is provided power supply means for supplying AC power to a high-pressure discharge lamp, detection means for detecting or calculating a lamp voltage, lamp current and lamp power of the high-pressure discharge lamp, and detection or calculation results of the detection means. A high pressure discharge lamp lighting device comprising a control unit for controlling the power supply means based on the control means, the control means comprising constant power control means for matching the lamp power to the set reference power, and after starting the high pressure discharge lamp When the elapsed time from the start of lighting is in a predetermined time zone during the start-up period until stable lighting, the set reference power is set to a power less than the rated lamp power, and when it is outside the predetermined time zone, the set reference power is A high pressure discharge lamp lighting device configured to have a rated lamp power.

In the high-pressure discharge lamp lighting device according to the third or fourth aspect, there are a plurality of predetermined lamp voltage regions or predetermined time zones, and a predetermined set reference power corresponding to each lamp voltage region corresponds to an increase in lamp voltage. To be higher.
In the high pressure discharge lamp lighting device according to the first to fourth aspects, the set reference power is switched gently over a period of 1 second to 1 minute.
Thereby, it is possible to suppress a sudden change in the light amount of the lamp, and to prevent the user from feeling uncomfortable particularly when used in a projector or the like.

According to a fifth aspect of the present invention, there is provided a high pressure discharge lamp lighting device, a high pressure discharge lamp, a reflector to which the high pressure discharge lamp is attached, and a housing containing the high pressure discharge lamp lighting device and the reflector. And a projector in which air cooling conditions are set based on lamp power.
When lighting with a constant power value less than the rated power value can be taken out as an external signal, or when the lighting period is specified by time, the projector body is optimally cooled for the power value corresponding to that period By setting, it is possible to prevent the lamp from becoming black due to lamp overcooling.

According to a sixth aspect of the present invention, there is provided power supply means for supplying AC power to the high pressure discharge lamp, detection means for detecting or calculating the lamp voltage, lamp current and lamp power of the high pressure discharge lamp, and detection or calculation result of the detection means. A high-pressure discharge lamp lighting device by a high-pressure discharge lamp lighting device comprising a control unit for controlling the power supply means based on the constant power control means for matching the lamp power to a constant set reference power, And constant current control means for making the lamp current coincide with a certain set reference current, and during the rising period from the start of the high-pressure discharge lamp to stable lighting, (A1) the lamp voltage is V ₁ (V ₁ < V ₀ ) Step of operating constant current control means when (V2) or less, (A2) After the lamp voltage exceeds V ₁ , constant power control is applied by applying a set reference power less than the rated lamp power. And (A3) after the lamp voltage exceeds V ₁₁ (V ₀ <V ₁₁ ), apply the set reference power equal to the rated lamp power and operate the constant power control means. After the stable lighting, (B1) the step of operating the constant current control means when the lamp voltage is less than V ₀ , and (B2) the set reference power equal to the rated lamp power when the lamp voltage is V ₀ or more Is used to operate the constant power control means.

According to a seventh aspect of the present invention, there is provided power supply means for supplying AC power to a high pressure discharge lamp, detection means for detecting or calculating a lamp voltage, lamp current and lamp power of the high pressure discharge lamp, and detection or calculation results of the detection means. A high-pressure discharge lamp lighting device by a high-pressure discharge lamp lighting device comprising a control unit for controlling the power supply means based on the constant power control means for matching the lamp power to a constant set reference power, And a constant current control means for making the lamp current coincide with a certain set reference current, and during the rising period from the start of the high pressure discharge lamp to the stable lighting, (C1) When the lamp voltage is V ₁ or less operating the constant current control means to operate the applies the set reference power lower than the rated lamp power constant power control means after (C2) the lamp voltage exceeds V ₁ Step, and (C3) after having reached a predetermined lighting conditions is a method comprising the step of operating the constant power control means applies the same set reference power to the rated lamp power.

In the seventh aspect, the predetermined lighting condition is that the lamp voltage exceeds V ₁₁ (V ₁ <V ₁₁ ) or the elapsed time after the lamp voltage exceeds V ₁ exceeds a predetermined value. It was.
Further, after the stable lighting of the high pressure discharge _lamp, as _{V 1 <V 0 <V 11} , steps, and (F2) lamp voltage to operate the constant current control means when (F1) the lamp voltage is less than _{V 0} When V ₀ or higher, the constant power control means is operated by applying a set reference power equal to the rated lamp power.

  According to the present invention, one or more constant power control periods less than the rated power are provided in the predetermined lamp voltage range or in the predetermined time zone from the start in the rising period before the rated power is reached after starting the lamp. Therefore, it is possible to prevent a sudden increase in power, and particularly to avoid the vicinity of the point where both the current value and the power value are highest. As a result, the amount of collision load applied to the electrode tip protrusion in the arc tube can be reduced, and wear of the electrode tip protrusion can be suppressed without delaying the rise. Thereby, it is possible to solve problems such as a decrease in lamp illuminance and occurrence of flicker during lighting due to disappearance of electrode protrusions.

FIG. 1 shows a high pressure discharge lamp lighting device according to an embodiment of the present invention. The high pressure discharge lamp lighting device includes a power supply means including a step-down chopper circuit 20 and a full bridge circuit 30, and an igniter circuit 40.
The step-down chopper circuit 20 includes a switching element 21, a diode 22, an inductor 23, a capacitor 24, and a PWM control circuit 28.
The full bridge circuit 30 receives the direct current output limited by the step-down chopper circuit 20, and the transistors 31 and 34 and the transistors 32 and 33 are alternately turned on / off at a frequency controlled by the full bridge control circuit 37. Thereby, the DC output of the step-down chopper circuit 20 is converted into an AC current and supplied to the high-pressure discharge lamp 50.

The resistors 25, 26 and 27 and the control unit (microcomputer) 60 constitute detection means and control means. It is not an essential problem of those attributes, that is, which part is included in the detection means and which part is included in the control means.
The lamp voltage is detected by the resistor 26 (point A), the lamp current is detected by the resistor 27 (point B), and is input to the respective control units 60. The lamp voltage and the lamp current are multiplied by a multiplier in the control unit 60 to calculate the lamp power.

The controller 60 includes constant power control means (function) and constant current control means (function).
In the operation of the constant power control means, the calculated lamp power is fed back by the error amplifier with respect to the preset reference power defined in advance. That is, the PWM control circuit 28 performs pulse width control on the duty ratio of the transistor 21 so that the lamp power becomes constant at the set reference power, and the high-pressure discharge lamp 50 is lit with that power.
In the operation of the constant power control means, the detected lamp current is fed back by the error amplifier with respect to a preset reference current. That is, the PWM control circuit 28 performs pulse width control of the duty ratio of the transistor 21 so that the lamp current becomes constant at the set reference current, and the high-pressure discharge lamp 50 is lit with that current.
In the following description, “lamp voltage”, “lamp current”, and “lamp power” have the same meanings as “output voltage”, “output current”, and “output power” of the step-down chopper circuit 20, respectively. To do.

  In the igniter circuit 40 for starting the high-pressure discharge lamp 50, when the discharge gap in the igniter control circuit 44 reaches the breakdown voltage, the voltage is applied to the pulse transformer primary winding 41 by the igniter control circuit 44. As a result, a pulse voltage corresponding to the step-up ratio of the pulse transformer secondary windings 42 and 43 is generated in the pulse transformer secondary windings 42 and 43 with respect to the voltage applied to the primary winding. A voltage is applied to the high-pressure discharge lamp 50, and the high-pressure discharge lamp 50 breaks down and lights up.

2A shows the lamp voltage (output voltage) -lamp power (output power) characteristics when the lamp is lit by the high pressure discharge lamp lighting device of the present invention, and FIG. 2B shows the lamp voltage (output voltage) -lamp current (output current). ) Characteristic. Here, as an example, as a characteristic during stable lighting, constant power control is performed with a rated lamp power of 200 W when the lamp voltage (VL) is equal to or higher than the lower limit V ₀ (for example, V ₀ = 55 V) of the rated lamp voltage, and when the lamp voltage is less than V _0. This shows constant current control with a rated lamp current of 3.6 A.

In addition, the dotted line of a figure is a part of each conventional characteristic demonstrated in FIG. In order to overcome the above-described conventional problems, it is necessary to perform a control that suppresses a rapid increase in lamp power and particularly avoids the vicinity of the P ₀ I ₀ point. Examples of the present invention will be described below.

FIG. 3 is a flowchart of the first embodiment.
In the following description, it is assumed that V ₁ = 40V, V ₀ = 55V, V ₁₁ = 60V, P ₁ = 150W, P ₀ = 200W, I ₀ = 3.6A. However, these numerical values are examples, and the present invention is not limited to these numerical values.
In step S100, start control is performed and lighting is started.
In step S300, the carried out constant current control of setting the reference current _{I 0.}
In step S310, the case where the detected lamp voltage VL is _{V 1} or less, the process returns to step S300, the case where VL exceeds _{V 1,} the flow proceeds to step S320.
The operation of continuing step S300 corresponds to points A to B in FIG.
In step S320, carried out is the constant power control of the set reference power _{P 1.}

In step S330, if the detected lamp voltage VL is _{V 11} or less, the process returns to step S320, if VL exceeds _{V 11,} the process proceeds to step S340.
The operation of continuing step S320 corresponds to points B to C in FIG.
In step S340, the set reference power is gradually increased, and then the process proceeds to step S900.
This step S340 corresponds to points C to D in FIG. Specifically, the setting reference power is gradually increased over a predetermined time Tup preset by the control unit 60 so that the lamp power becomes the power value P ₀ . In FIG. 2, C to D are lines perpendicular to the horizontal axis. However, since the set reference power is gradually increased, this line is slightly inclined.

The time Tup applied to transition from P ₁ to P ₀ may be about 1 second to 1 minute. If this is shorter than 1 second, a light step can be visually recognized, which is not preferable in actual use. In addition, if it is 1 minute or longer, the operation after stable lighting is delayed. Therefore, the above range is appropriate.

After step S900, that is, after shifting to the constant power control of P ₀ once, the control for stable (rated) lighting similar to the conventional example is performed, and the constant power control of the set reference power P ₀ is performed. At this time, the lighting state is on the right side of the point D in FIG. If the lamp is a normal lamp, the lamp voltage is any voltage of 120V or less.

In step S910, if the detected lamp voltage VL is greater than or equal to _{V 0,} the constant power control by _{P 0} returns to step S900 it is to continue, if VL is less than _{V 0,} the process proceeds to step S920.
In step S920, carried out is the constant current control of the setting reference current _{I 0.}
Here, step S900 corresponds to the right side from the point E in FIG. 2, and step S920 corresponds to the left side from the point E.

By the above control, the high pressure discharge lamp can be raised without passing the P ₀ I ₀ point, that is, the state where the current value is high and the power value is high, so that wear of the electrode tip protrusion can be suppressed. Further, in addition to avoiding the P ₀ I ₀ point, it is possible to prevent an abrupt increase in lamp power accompanying a rapid increase in lamp voltage at least between B and C in FIG.

FIG. 4 is a flowchart of the second embodiment. In the first embodiment, the configuration in which the control is switched based on the lamp voltage is shown, but in the present embodiment, the configuration in which the control is switched based on the elapsed time from the start of lighting is shown.
Since the relationship between the elapsed time from the start of lamp lighting and the lamp voltage is somewhat predictable as shown in FIG. 12, it is possible to predictably avoid the P ₀ I ₀ point based on the elapsed time. Note that a timer in the control circuit 60 may be used for the elapsed time.
In the following description, it is assumed that V ₀ = 55 V, P ₁ = 150 W, P ₀ = 200 W, and I ₀ = 3.6 A. However, these numerical values are examples, and the present invention is not limited to these numerical values. The values of T ₁ and T ₀₁ may be appropriately selected according to the characteristics of the lamp with reference to experimental values.

As shown in FIG. 4, start control is performed in step S100, and lighting is started.
In step S400, carried out is the constant current control of the setting reference current _{I 0.}
In step S410, if the elapsed time from the start of lighting tx is _{T 1} or less, the process returns to step S400, if tx exceeds _{T 1,} the process proceeds to step S420.
In step S420, carried out is the constant power control of the set reference power _{P 1.}
In step S430, if the elapsed time from the start of lighting tx is _{T 01} or less, the process returns to step S420, if tx exceeds _{T 01,} the process proceeds to step S450.
In step S440, the set reference power is gradually increased over time Tup, and then the process proceeds to step S900.
Since step S900 and subsequent steps are the same as those in the first embodiment, description thereof is omitted.

Also in the above control, since the high pressure discharge lamp can be stood up by predictingly avoiding the P ₀ I ₀ point, that is, the state where the current value is high and the power value is high, the wear of the electrode tip protrusion can be suppressed. it can. Also, P ₀ in addition to I ₀ can avoid point, between at least of FIG. 2 B-C can prevent rapid increase in lamp power caused by the steep rise of the lamp voltage.

FIG. 5 is a flowchart of the third embodiment. In the first and second embodiments, the configuration in which the control is switched based on the lamp voltage or the elapsed time is shown. However, in the present embodiment, the configuration in which the control is switched using both effectively is shown.
In the following description, it is assumed that V ₁ = 40 V, V ₀ = 55 V, P ₁ = 150 W, P ₀ = 200 W, and I ₀ = 3.6 A. However, these numerical values are examples, and the present invention is not limited to these numerical values. The value of T ₁₁ may be selected as appropriate depending on the characteristics of the lamp such as with reference to experimental values.

As shown in FIG. 5, start control is performed in step S100, and lighting is started.
In step S500, carried out is the constant current control of the setting reference current _{I 0.}
In step S510, if the detected lamp voltage VL is _{V 1} or less, the process returns to step S500, if VL exceeds _{V 1,} the flow proceeds to step S520.
In step S520, carried out is the constant power control of the set reference power _{P 1.}
In step S530, if the elapsed time ty from the lamp voltage VL exceeds the _{V 1} is at _{T 11} or less, the process returns to step S520, if ty exceeds _{T 11,} the process proceeds to step S540.
In step S540, the set reference power is gradually increased over time Tup, and then the process proceeds to step S900.
Since step S900 and subsequent steps are the same as those in the first embodiment, description thereof is omitted.

Also in the above-described control, the high pressure discharge lamp can be raised without passing the P ₀ I ₀ point, that is, the state where the current value is high and the power value is high, so that wear of the electrode tip protrusion can be suppressed. Further, in addition to avoiding the P ₀ I ₀ point, it is possible to prevent an abrupt increase in lamp power accompanying a rapid increase in lamp voltage at least between B and C in FIG.

FIG. 6 is a flowchart of the fourth embodiment. In the third embodiment, the configuration in which the control is switched based on the lamp voltage and the elapsed time is shown. However, in this embodiment, a configuration in which the control can be performed more reliably is shown.
In the following description, it is assumed that V ₁ = 40V, V ₀ = 55V, V ₁₁ = 60V, P ₁ = 150W, P ₀ = 200W, I ₀ = 3.6A. However, these numerical values are examples, and the present invention is not limited to these numerical values. The value of T ₁₁ may be selected as appropriate depending on the characteristics of the lamp such as with reference to experimental values.

As shown in FIG. 6, start control is performed in step S100, and lighting is started.
At step S600, the carried out constant current control of setting the reference current _{I 0.}
In step S610, the case where the detected lamp voltage VL is _{V 1} or less, the process returns to step S600, if VL exceeds _{V 1,} the flow proceeds to step S620.
In step S620, carried out is the constant power control of the set reference power _{P 1.}
In step S630, if the detected lamp voltage VL is V ₁₁ or less, or if the elapsed time ty after the lamp voltage VL exceeds V ₁ is T ₁₁ or less, the process returns to step S620; The process proceeds to S640.
In step S640, the set reference power is gradually increased over time Tup, and then the process proceeds to step S900.
Since step S900 and subsequent steps are the same as those in the first embodiment, description thereof is omitted.

  In the above method, for example, a lamp whose lamp voltage is originally low is considered to be capable of stable lighting when a predetermined time elapses, and is shifted to control for stable lighting. Thereby, the lighting device and the lighting method more suitable for actual use can be achieved.

7 and 8 show a fifth embodiment. In the first to fourth embodiments, the constant power control period below the rated power is set to one stage, but in this embodiment, the stage is further divided into a plurality of stages.
In the first to fourth embodiments, the main purpose is to avoid the P ₀ I ₀ point. However, the present embodiment has a main purpose to prevent inconvenience associated with voltage rise at an earlier stage. Indicates.
FIG. 7 shows (a) voltage-power characteristics and (b) voltage-current characteristics when constant current control less than the rated power by the high-pressure discharge lamp lighting device of the present invention is performed in a plurality of stages (for example, two stages).
FIG. 8 is a flowchart of the control of the high pressure discharge lamp lighting device in that case.
In the following description, V ₂ = 27V, V ₂₁ = 40V, V ₀ = 55V, V ₁₁ = 60V, P ₂ = 100W, P ₁ = 150W, P ₀ = 200W, I ₀ = 3.6A. . However, these numerical values are examples, and the present invention is not limited to these numerical values. The values of T ₂₁ and T ₁₁ may be selected as appropriate depending on the characteristics of the lamp such as with reference to experimental values.

As shown in FIG. 8, start control is performed in step S100, and lighting is started.
In step S800, carried out is the constant current control of the setting reference current _{I 0.}
In step S810, if the detected lamp voltage VL is _{V 2} or less, the process returns to step S800, if VL exceeds _{V 2} (e.g., _V 2 = 27V), the process proceeds to step S820.
In step S820, constant power control of set reference power P ₂ (for example, P ₂ = 100 W) is performed.
In step S830, if the detected lamp voltage VL is V ₂₁ or less, or if the elapsed time ty after the lamp voltage VL exceeds V ₂₁ is T ₂₁ or less, the process returns to step S820; Proceed to S840.
In step S840, the set reference power is gradually increased over time Tup, and then the process proceeds to step S850.

In step S850, carried out is the constant power control of the set reference power _{P 1.}
In step S860, if the detected lamp voltage VL is V ₁₁ or less, or if the elapsed time ty after the lamp voltage VL exceeds V ₁₁ is T ₁₁ or less, the process returns to step S850, and VL is V _11. If the value exceeds Ty or if ty is equal to or greater than T11, the process proceeds to step S870.
In step S870, the set reference power is gradually increased over time Tup, and then the process proceeds to step S900.
Since step S900 and subsequent steps are the same as those in the first embodiment, description thereof is omitted.

In the above embodiment, the number of stages is two, but it may be three or more.
Further, the first stage of the constant power control period of a plurality of stages may be started immediately after starting the lamp without providing the constant current control period of step S800 after starting the lamp. In this case, the constant current control is not performed until the stable lighting control (after step S900) is reached.
According to the above embodiment, in addition to the effects obtained in Embodiments 1 to 4, it is possible to more reliably avoid inconvenience due to the rapid increase in lamp voltage accompanying the rapid increase in lamp voltage.

A light source device as an application using the above embodiment is shown in FIG. In FIG. 11, reference numeral 70 denotes a high pressure discharge lamp lighting device according to the embodiment described above, and reference numeral 80 denotes a housing containing the high pressure discharge lamp lighting device 70 and the high pressure discharge lamp 50. When the lighting period can be extracted by an external signal with a constant power value less than the rated power value, or when the period is specified by time, the air cooling condition that is optimal for the power value during that period can be set in advance in the projector body. It is possible to prevent blackening of the lamp due to overcooling of the lamp.
In addition, the figure is a schematic illustration of the embodiment, and the dimensions, arrangement, and the like are not as illustrated. Then, a projector is configured by appropriately arranging video system members (not shown) in the housing 80. As a result, it is possible to obtain a high-quality projector that prevents a decrease in the illuminance of the lamp and the occurrence of flicker during lighting without delaying the rise of the luminous flux.

  In addition, although the said Example was shown as the most suitable example of this invention, if a lamp voltage and a lamp current can be detected, and constant power control and constant power control can be performed by calculating them, The lighting device may have another circuit configuration. That is, for the step-down chopper circuit 20 and the full bridge circuit 30 shown as the power supply means, the step-down chopper circuit 20 shown as the output current control means may be another known circuit system (for example, a flyback type). In addition, the full bridge circuit 30 shown as the AC conversion unit may also be another known circuit system (for example, a push-pull type).

1 is a circuit diagram of a high-pressure discharge lamp device according to an embodiment of the present invention. It is a figure which shows the lighting characteristic which concerns on 1st Example of this invention. It is a flowchart which shows the 1st Example of this invention. It is a flowchart which shows the 2nd Example of this invention. It is a flowchart which shows the 3rd Example of this invention. It is a flowchart which shows the 4th Example of this invention. It is a figure which shows the lighting characteristic which concerns on the 5th Example of this invention. It is a flowchart which shows the 5th Example of this invention. It is a figure which shows the electrode of an early high pressure discharge lamp. It is a figure which shows wear and tear of an electrode front-end | tip protrusion. It is a figure which shows the light source device of this invention. It is a figure which shows the behavior of the lamp voltage of a general high pressure discharge lamp. It is a figure which shows the lighting characteristic of a prior art example.

Explanation of symbols

10: DC power supply 20: step-down chopper circuits 21, 31, 32, 33, 34: transistor 22 ,: diodes 23, 35: choke coils 24, 36, capacitors 25, 26, 27, resistors 28: PWM control circuit 30 : Full bridge circuit 37: bridge control circuit 40: igniter circuits 41, 42, 43: pulse transformer 44: igniter control circuit 50: high pressure discharge lamp 60: control unit 70: high pressure discharge lamp lighting device 80: projector housing

Claims (13)

Power supply means for supplying AC power to the high pressure discharge lamp, detection means for detecting or calculating the lamp voltage, lamp current and lamp power of the high pressure discharge lamp, and the power supply means based on the detection or calculation result of the detection means A high pressure discharge lamp lighting device comprising a control unit for controlling
The control means includes constant power control means for matching the lamp power to a constant set reference power, and constant current control means for matching the lamp current to a constant set reference power, and the high-pressure discharge lamp reaches stable lighting. Later, when the lamp voltage is less than V ₀ , the constant current control means is operated, and when the lamp voltage is V ₀ or more, the set reference power equal to the rated lamp power is applied to operate the constant power control means. In the configured high pressure discharge lamp lighting device,
In the rising period from starting the high-pressure discharge lamp to stable lighting, the control means,
When the lamp voltage is V ₁ (V ₁ <V ₀ ) or less, the constant current control means is operated,
When the lamp voltage exceeds the V ₁ was operated with the constant power control means to apply the set reference power-rated lamp power,
A high pressure discharge lamp lighting device configured to operate the constant power control means by applying a set reference power equal to a rated lamp power when the lamp voltage exceeds V ₁₁ (V ₀ <V ₁₁ ). Power supply means for supplying AC power to the high pressure discharge lamp, detection means for detecting or calculating the lamp voltage, lamp current and lamp power of the high pressure discharge lamp, and the power supply means based on the detection or calculation result of the detection means A high pressure discharge lamp lighting device comprising a control unit for controlling
The control means comprises constant power control means for matching the lamp power with a constant set reference power, and constant current control means for matching the lamp current with a constant set reference power,
In the rising period from starting the high-pressure discharge lamp to stable lighting,
When the lamp voltage is V ₁ or less, the constant current control means is operated,
When the lamp voltage exceeds V ₁ was operated with the constant power control means to apply the set reference power-rated lamp power,
A high pressure discharge lamp lighting device configured to operate the constant power control means by applying a set reference power equal to a rated lamp power when a predetermined lighting condition is reached. 3. The high pressure discharge lamp lighting device according to claim 2, wherein the predetermined lighting condition is that the lamp voltage exceeds V ₁₁ (V ₁ <V ₁₁ ) or the elapsed time after the lamp voltage exceeds V _1. A high pressure discharge lamp lighting device that exceeds a predetermined value. In the high pressure discharge lamp lighting device according to claim 3, wherein the control means further after stable lighting of the high pressure discharge lamp, in the case of _{V 1 <V 0 <V 11} , when the lamp voltage is less than V ₀ Is a high pressure discharge lamp lighting device configured to operate the constant current control means, and to operate the constant power control means by applying a set reference power equal to a rated lamp power when the lamp voltage is V ₀ or more. Power supply means for supplying AC power to the high pressure discharge lamp, detection means for detecting or calculating the lamp voltage, lamp current and lamp power of the high pressure discharge lamp, and the power supply means based on the detection or calculation result of the detection means A high pressure discharge lamp lighting device comprising a control unit for controlling
The control means includes constant power control means for matching the lamp power to a predetermined set reference power, and the lamp voltage is a predetermined lamp voltage during a rising period from when the high pressure discharge lamp is started until stable lighting is achieved. When the voltage is in the range (V _{1 to} V ₁₁ ), the set reference power is set to be less than the rated lamp power, and when the voltage is outside the predetermined lamp voltage range, the set reference power is set to the rated lamp power. Discharge lamp lighting device. Power supply means for supplying AC power to the high pressure discharge lamp, detection means for detecting or calculating the lamp voltage, lamp current and lamp power of the high pressure discharge lamp, and the power supply means based on the detection or calculation result of the detection means A high pressure discharge lamp lighting device comprising a control unit for controlling
The control means includes constant power control means for making the lamp power coincide with a set reference power, and an elapsed time from the start of lighting is a predetermined time in a rising period from the start of the high-pressure discharge lamp to stable lighting. A high pressure discharge lamp lighting device configured to set the set reference power as power less than the rated lamp power when in a time zone and set the set reference power as a rated lamp power when outside the predetermined time zone.   7. The high pressure discharge lamp lighting device according to claim 5 or 6, wherein the predetermined lamp voltage range or the predetermined time zone has a plurality of stages, and a predetermined set reference power corresponding to each lamp voltage range corresponds to an increase in lamp voltage. High pressure discharge lamp lighting device.   The high pressure discharge lamp lighting device according to any one of claims 1 to 7, wherein the setting reference power is gently switched over a period of 1 second to 1 minute.   A high-pressure discharge lamp lighting device according to any one of claims 1 to 8, a high-pressure discharge lamp, a reflector to which the high-pressure discharge lamp is attached, and a housing containing the high-pressure discharge lamp lighting device and the reflector, A projector in which air cooling conditions are set based on the lamp power. Power supply means for supplying AC power to the high pressure discharge lamp, detection means for detecting or calculating the lamp voltage, lamp current and lamp power of the high pressure discharge lamp, and the power supply means based on the detection or calculation result of the detection means A method of lighting a high pressure discharge lamp by a high pressure discharge lamp lighting device comprising a control unit for controlling
The control means comprises constant power control means for matching the lamp power with a constant set reference power, and constant current control means for matching the lamp current with a constant set reference power,
In the rising period from starting the high-pressure discharge lamp to stable lighting,
(A1) a step of operating the constant current control means when the lamp voltage is V ₁ (V ₁ <V ₀ ) or less;
(A2) after the lamp voltage exceeds V ₁ , the step of operating the constant power control means by applying a set reference power less than the rated lamp power; and (A3) the lamp voltage is V ₁₁ (V ₀ < After exceeding V ₁₁ ), it comprises the step of operating the constant power control means by applying a set reference power equal to the rated lamp power,
After the stable lighting,
(B1) when the lamp voltage is less than V ₀ the constant current control step causes means is operated, and (B2) when the lamp voltage is greater than V ₀ by applying the set reference power equal to the rated lamp power the constant power A method comprising the step of operating a control means. Power supply means for supplying AC power to the high pressure discharge lamp, detection means for detecting or calculating the lamp voltage, lamp current and lamp power of the high pressure discharge lamp, and the power supply means based on the detection or calculation result of the detection means A method of lighting a high pressure discharge lamp by a high pressure discharge lamp lighting device comprising a control unit for controlling
The control means comprises constant power control means for matching the lamp power with a constant set reference power, and constant current control means for matching the lamp current with a constant set reference power,
In the rising period from starting the high-pressure discharge lamp to stable lighting,
(C1) a step of operating the constant current control means when the lamp voltage is V ₁ or less;
(C2) after the lamp voltage exceeds a V ₁ was, step operates the constant power control means to apply the set reference power-rated lamp power, and (C3) after reaching the predetermined lighting conditions, Applying the set reference power equal to the rated lamp power to operate the constant power control means. 12. The method according to claim 11, wherein the predetermined lighting condition is that the lamp voltage exceeds V ₁₁ (V ₁ <V ₁₁ ) or the elapsed time after the lamp voltage exceeds V ₁ exceeds a predetermined value. The way it is. The method according to claim 11, further comprising: V ₁ <V ₀ <V ₁₁ after stable lighting of the high pressure discharge lamp.
(F1) a step of operating the constant current control means when the lamp voltage is less than V ₀ ; and (F2) applying the set reference power equal to the rated lamp power when the lamp voltage is V ₀ or more. A method comprising the step of operating a control means.

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