JP2002110380A - Lighting method and device of high intensity discharge lamp - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lighting device of a high intensity discharge lamp in which the adjustment of plural time constant circuits combining a capacitor and a resister that has been necessary for the reduction of supply power is eliminated, and an optimum power for the relighting starting is supplied even in the case lighting and putting out are repeated in a short time. SOLUTION: Using a micro-controller, the length of the lights-out period that has been put out before lighting and the lighting period that had been lighted on previously of the high intensity discharge lamp is used as a factor, and the power supplied for starting lighting of the high intensity lamp is calculated and controlled, and the supplied power after lighting is made to be reduced according to the power formula.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for lighting a high-intensity discharge lamp, and more particularly to a lighting method and an apparatus for rapidly increasing brightness after lighting a headlight or drama lighting of an automobile.

[0002]

2. Description of the Related Art A headlight lamp for an automobile is required to have a light source that is quickly turned on, bright and has good visibility in order to drive safely in a tunnel or at night or in bad weather such as rain and fog. As a lighting device for raising the luminance at a high speed, for example, there is an invention of a "lighting device for a high-intensity discharge lamp" disclosed in Japanese Patent Application Laid-Open No. H11-135287. The present invention uses a plurality of time-constant circuits using a capacitor and a resistor and a capacitor charging circuit to supply a large amount of power at the time of starting a lighting operation and a predetermined amount of time after the lighting operation in order to quickly raise the brightness of the metal halide lamp. This is a lighting device that gradually reduces the supply power so that the lighting power becomes steady over time.

[0003]

In the conventional method, control is performed using a plurality of time constant circuits and a capacitor charging circuit in which a capacitor and a resistor are combined. It is necessary to make adjustments in consideration of such changes and their temperature changes, and it is difficult to make an optimal design, and a long adjustment work time is required, and the accuracy of the power control time cannot be improved.

[0004] Further, in the case where lighting and extinguishing are repeated in a very short time, such that the lighting is turned off before the supply power is reduced to the supply power at the time of steady lighting after the start of lighting, and then turned on immediately thereafter, Optimal power supply at the start of relighting was difficult.

[0005]

A first aspect of the present invention is a lighting method for quickly raising the brightness of a high-intensity discharge lamp, wherein the high-intensity discharge lamp is extinguished before lighting.
a high-intensity discharge lamp characterized by calculating and controlling an initial supply power Po to be supplied when the high-intensity discharge lamp is started to be turned on, by using the length of f and the lighting period Ton that was lit last time as a factor. The lighting method is provided.

In other words, when the high-intensity discharge lamp is once turned off and then immediately turned on again, unless the power control suitable for the lamp is performed, the surroundings will be adversely affected, such as being too bright, too dazzling, or the life of the lamp. Therefore, the initial supply power Po supplied at the time of re-lighting is determined not only based on the length of the light-off period Toff until re-lighting, but also based on the length of the light-on period Ton that was lit last time. By turning on and off, the lighting is turned off before the power is reduced to the supply power Pk during steady lighting, and then turned on and off again in a very short time. Also in this case, it is possible to perform optimal power supply at the time of re-lighting start.

According to a second invention, in the lighting method of the high-intensity discharge lamp according to the first invention, the initial supply power Po is:
The lighting period To which is higher than or equal to the supply power Pk and lower than or equal to the upper limit power value Pm during the steady lighting of the high-intensity discharge lamp and has been lit last time.
A method for lighting a high-intensity discharge lamp is characterized in that the initial supply power Po is smaller as n is longer and the initial supply power Po is larger as the light-off period Toff, which has been turned off before lighting, is longer.

That is, when the high-intensity discharge lamp is once turned off and then turned on again after a short period of time, the optimal power value of the initial supply power Po is determined by the temperature in the lamp of the high-intensity discharge lamp and the degree of activation of xenon gas. And the longer the lighting period Ton, which was lit last time, the higher the temperature inside the lamp and the greater the degree of activation of xenon gas, so that the initial supply power Po can be reduced.

Then, the light-off period T, which has been turned off before lighting,
The longer the off, the lower the temperature inside the lamp and the lower the degree of activation of the xenon gas, so the initial supply power Po needs to be increased.

The initial supply power Po is maximized during a cold start in which the high-intensity discharge lamp is started to be turned on with the temperature of the lamp being equal to the ambient temperature. Pm. The upper limit power value Pm is a value determined by the type of the high-intensity discharge lamp, and is, for example, about three times the supply power Pk at the time of steady lighting in a headlight lamp of an automobile.

According to a third invention, in the lighting method of the high-intensity discharge lamp according to the first invention or the second invention, the initial supply power Po is a light-off period Toff which has been turned off before lighting.
Is longer than a predetermined time, the supply power P during steady-state lighting
A lighting method for a high-intensity discharge lamp characterized in that the power is approximately three times k.

That is, the extinguishing period T, which was extinguished before the lighting,
The longer the off, the lower the temperature inside the lamp and the lower the degree of activation of the xenon gas, so it is necessary to increase the initial supply power Po. However, when the turn-off period Toff is equal to or longer than a predetermined time, the temperature of the lamp becomes lower. The same supply power as the initial supply power Po required at the time of a cold start in which the high-intensity discharge lamp is turned on and started at the same temperature as the ambient temperature is required. The initial supply power Po when the light-off period Toff is equal to or longer than a predetermined time is equal to the upper limit power value Pm. This upper limit power value Pm
Is a value determined by the type of the high-intensity discharge lamp, and is approximately three times the supply power Pk of the high-intensity discharge lamp at the time of steady lighting.

According to a fourth aspect of the present invention, in the method for lighting a high-intensity discharge lamp according to any one of the first to third aspects, the initial supply power Po is determined by setting a lighting period Ton which was previously lit to a predetermined value. The present invention provides a method of lighting a high-intensity discharge lamp, wherein the power is substantially constant when the length is equal to or longer than the length.

That is, the temperature inside the lamp of the high-intensity discharge lamp increases with the elapsed lighting time, but the lighting period Ton
Is longer than a predetermined length, and the activation of xenon gas is also substantially constant. Therefore, when the light-off period Toff, which has been turned off before lighting, is less than the predetermined time, the lighting period The power Pk in the case of steady lighting with Ton being equal to or longer than a predetermined length may be a constant power value.

If the lighting period Ton, which was lit last time, is longer than a predetermined length, and if the light-off period Toff, which was turned off before lighting, is longer than a predetermined time, the high-intensity discharge lamp is turned off. As described in the description of the third invention, the initial supply power Po is equal to the upper limit power value Pm, and is approximately three times the supply power Pk at the time of steady lighting.

According to a fifth aspect of the present invention, in the lighting method of the high-intensity discharge lamp according to any one of the first to fourth aspects, the extinguishing period in which the high-intensity discharge lamp is extinguished before the lighting is turned off. Assuming that the lighting period of the previous lighting is Ton, the upper limit power value to be supplied is Pm, and A to D and a to c are constants determined by the type of the high-intensity discharge lamp, the initial supply power Po is And a method for lighting a high-intensity discharge lamp characterized by the following.

That is, the initial supply power Po supplied when the high-intensity discharge lamp is turned on is Toff for the extinguishing period in which the high-intensity discharge lamp was extinguished before lighting, and Ton for the lighting period in which the high-intensity discharge lamp was lit last time. The power can be supplied with the optimum power determined by the power calculation formula as a factor.

It is to be noted that the lighting period Ton, which was lit last time, is very short, or the light-off period Toff, which is lit until this time, is turned on.
Is longer than a predetermined period (for example, about 3 minutes for a headlight lamp of an automobile), it is regarded as the same condition as a cold start in which the high-intensity discharge lamp is started to be turned on when the temperature of the lamp is equal to the ambient temperature. For this reason, the initial supply power Po at that time has a predetermined upper limit power value Pm at the time of cold start as an upper limit.

The predetermined upper limit power value Pm at the time of cold start of the initial supply power Po is a value determined by the type of the high-intensity discharge lamp. It is about three times the value of

According to a sixth aspect of the present invention, in the method for lighting a high-intensity discharge lamp according to any one of the first to fifth aspects, after the high-intensity discharge lamp is turned on, the length of elapsed lighting time t is increased. And controlling the supply power Pt to be supplied to the high-intensity discharge lamp using the factor as a factor.

That is, the initial supply power Po at the start of re-lighting.
Therefore, it is possible to perform the optimal power supply by gradually reducing the supply power in accordance with the curve of the supply power Pt obtained by the power calculation formula stored in the microcontroller with the lapse of time after the lighting start.

According to a seventh aspect of the present invention, in the method for lighting a high-intensity discharge lamp according to the sixth aspect, after the high-intensity discharge lamp is turned on, the supply power Pt is equal to the first half of the time required to reach the supply power Pk during steady-state lighting. Provides a method for lighting a high-intensity discharge lamp, characterized in that it is greatly reduced compared to the latter half.

In a high-intensity discharge lamp, when a high voltage from a high-voltage generator (commonly called an igniter) causes dielectric breakdown between the lamp electrodes and a narrow discharge path is formed,
Then, glow discharge occurs, and further proceeds to arc discharge. In the process, the electrons and electrons of the xenon gas are excited by the electrons emitted from the lamp electrode, and when the energy returns from the excited state to a low energy state or the free electrons emitted by the energy higher than the ionization energy are recombined with the ions. Sometimes, high-luminance light unique to xenon gas is emitted.

At this time, an avalanche of electrons is generated by the electrons emitted from the lamp electrode, and the generated electrons or cations collide with the electrode, so that heat is given to the electrode and more electrons are emitted. Therefore, a large amount of power is required in the initial stage of lighting of a high-intensity discharge lamp. The supply power Pt can be greatly reduced in the first half of the time required to reach the supply power Pk in steady lighting as compared with the latter half.

According to an eighth invention, in the lighting method of a high-intensity discharge lamp according to the sixth invention or the seventh invention, the initial supply power is Po, the upper limit power supply value is Pm, and a and c are the same. Assuming that the constant is determined by the type of the high-intensity discharge lamp, the supply power Pt to be supplied to the high-intensity discharge lamp at an elapsed time t after the high-intensity discharge lamp is turned on is: And a method for lighting a high-intensity discharge lamp characterized by the following.

That is, the supply power Pt supplied to the high-intensity discharge lamp at the elapsed time t after the high-intensity discharge lamp has been turned on.
The optimum power supply can be performed if the supply power is gradually reduced in accordance with the power curve obtained by the power calculation equation having the elapsed time t as a factor. It eliminates the need for multiple time constant circuits, time constant circuit adjustments that take into account variations in resistance values, variations in capacitor capacitance, changes over time and changes in temperature, etc., and accuracy in power control time Can also be higher.

When the calculated value of the supplied power Pt exceeds a predetermined upper limit power value Pm, the predetermined upper limit power value Pm is set as the upper limit during the elapsed time t. Note that the predetermined upper limit power value Pm of the supply power Pt is the same as the predetermined upper limit power value Pm of the initial supply power value Po supplied when the high-intensity discharge lamp is turned on at the time of a cold start. The value is determined by the type of the high-intensity discharge lamp, and for example, in the case of a headlight lamp of an automobile, the value is about three times the supply power at the time of steady lighting.

A ninth invention is directed to the method of lighting a high-intensity discharge lamp according to any one of the first to eighth inventions, based on input information of the type of high-intensity discharge lamp to be used and the intended use. Lighting operation of a high-intensity discharge lamp characterized by selecting a power calculation formula, and calculating and controlling an initial supply power Po and a supply power Pt to be supplied after lighting which are optimal for the type and use of the high-intensity discharge lamp. Provide a way.

That is, for various applications such as headlights, drama lighting, spotlights and blinking lighting of automobiles, optimal high-intensity lighting specific to the type of high-intensity discharge lamp, power supply voltage and rising speed is required. However, in the present invention, even if the lamp or application changes, the lighting device is not changed, and a program suitable for each application is used, or an electric power that supplies an optimum power to each by an input means such as a dip switch. The method of automatically selecting the formula can greatly reduce the types of lighting devices to be manufactured.

The tenth invention is a lighting device for quickly raising the brightness of a high-intensity discharge lamp, wherein the high-intensity discharge lamp is lit for a lighting period Ton and a light-off period T for being turned off.
means for measuring and storing the off-state, and DC-DC for input
It has a converter circuit, an inverter circuit and a high voltage generator called an igniter, and the length of the light-off period Toff in which the high-intensity discharge lamp was turned off before lighting and the lighting period Ton which was turned on last time as a factor. A program for calculating and controlling an initial supply power Po to be supplied when the high-intensity discharge lamp is turned on, and supplying the high-intensity discharge lamp to the high-intensity discharge lamp after the high-intensity discharge lamp is turned on using the elapsed time t after lighting as a factor A lighting device for a high-intensity discharge lamp, comprising: a microcontroller storing a program for calculating and controlling the supply power Pt to be supplied.

That is, in recent years, microcontrollers have been rapidly reduced in size, improved in function, and reduced in price, overcoming the disadvantages of conventional microcontrollers, and performing high-speed operations and control without practical problems. According to the present invention, the optimum power is supplied by the above-described power calculation formula using a microcontroller without using a plurality of time constant circuits or a capacitor charging circuit combining a capacitor and a resistor. can do.

Further, downsizing has been promoted by reducing the time constant circuit and the capacitor charging circuit, and the lamp can be incorporated into a high-intensity discharge lamp unit in which a lamp of a high-intensity discharge lamp and its lighting device are integrally integrated. It is possible to reduce the size and cost of the device.

According to an eleventh aspect, in the lighting device for a high-intensity discharge lamp according to the tenth aspect, there is provided input means for inputting input information of the type of the high-intensity discharge lamp to be used and the intended use.
Provided is a lighting device for a high-intensity discharge lamp, comprising a microcontroller storing a program for calculating and controlling the initial supply power Po and the supply power Pt that are optimal for the type and use of the high-intensity discharge lamp. .

That is, for various applications such as headlights, drama lighting, spotlights and blinking lighting of automobiles, optimum high-brightness lighting specific to the type of high-brightness discharge lamp, power supply voltage and rising speed is required. However, in the present invention, even if the lamp or the application is changed, without changing the lighting device, using a program suitable for each application, a power type that supplies an optimum power to each by an input means such as a dip switch. Can be automatically selected to greatly reduce the types of lighting devices to be manufactured.

[0035]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The characteristics of a headlight lamp for an automobile as an example of a high-intensity discharge lamp will be examined. Immediately after the lighting of the automotive lamp filled with xenon gas, the lamp voltage once rises, and when xenon is activated, the lamp voltage drops to about 20 volts. Thereafter, the mercury in the lamp is vaporized, and the lamp voltage increases as the lamp internal pressure increases. At this time, the luminance increases with a delay with respect to the increase in the lamp voltage. By performing power control corresponding to this lamp characteristic, it is possible to start up the lamp at high speed.

That is, using a microcontroller,
The control corresponding to the lamp characteristic and the control corresponding to the time delay of the luminance are performed. Specifically, the time required for xenon to be activated (depending on the current flowing in a headlight lamp of an automobile, but about 1 second or less as an example) is because the lamp voltage is relatively high and the amount of electric power is supplied during steady operation. The current is set to about three times Pk, and a current necessary for rapidly raising the luminance is supplied.

As the luminance increases with the passage of time, the power supplied to the lamp is reduced. The rate at which the power is reduced is such that the supplied power reaches the supply power Pk at the time of steady lighting in about one minute, and the brightness reaches 90% of the steady value several seconds after lighting.
% To 110%, and although there is an increase or decrease within this range, the ratio can be maintained at a substantially constant value.

In particular, when the high-intensity discharge lamp is once turned off and then immediately turned on again, unless power control suitable for the lamp is performed, the surroundings such as too bright and too dazzling may be adversely affected, or the lamp may be damaged. Since there is also a problem of shortening the service life, the present invention uses a microcontroller to turn off the high-intensity discharge lamp before turning on.
f, and the length of the lighting period Ton, which was lit last time, is used as a factor to calculate and control the optimum initial supply power Po to be supplied when the high-intensity discharge lamp is started to light, and to control the high-intensity discharge lamp. After lighting, the power supply Pt to be supplied to the high-intensity discharge lamp is calculated and controlled using the length of the lighting elapsed time t as a factor.

When the light is turned on immediately after the light is turned off, a voltage value that can maintain a current value that can maintain the arc discharge immediately after the lighting and does not extinguish is required.

Further, the pressure in the lamp decreases with the elapse of the lamp extinguishing time, and the voltage after extinguishing decreases with time. After several tens of seconds, the pressure in the lamp is still high but the voltage almost returns to the initial value. It takes several hours at room temperature in the dark to be exactly the same.

[0041]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to the circuit diagram of FIG. The detected values of the output voltage and output current of the DC-DC converter circuit 2 connected to the input power supply 1 are input to the microcontroller 6, and pulsed by a signal from the microcontroller 6 so that the supplied power is calculated by the power equation. The output of the DC-DC converter circuit 2 whose width is controlled is connected to an inverter circuit 3. The inverter circuit 3 has a fixed frequency of several tens Hz for several cycles immediately after the start of lighting by a signal from the microcontroller 6. Approximately 400Hz to 500H predetermined
The DC of the output of the DC-DC converter circuit 2 is converted into AC at a predetermined fixed frequency within the range of z, and the output of the inverter circuit 3 is input to a high voltage generator 4 called an igniter, and the high voltage generator 4 Is connected to the lamp 5 of the high-intensity discharge lamp.

The type and use of the high-intensity discharge lamp can be input to the microcontroller 6 by input means (not shown) such as a dip switch of the microcontroller 6 as necessary.

Next, using the flowchart of FIG.
Calculation and control using the microcontroller 6 will be described.

When the "lamp lighting switch is turned on" in S1, the power of the microcontroller 6 is turned on, the control by the microcontroller 6 is started in "START" in S2, and the "confirmation of the lamp type and the like" in S3 is performed. The initialization of various data is performed in "initial setting" of S4, and "the previous lighting period Ton and light-off period Toff are read from the storage memory" in S5.

The lighting period during which the high-intensity discharge lamp was lit last time is Ton, the light-off period that has been turned off before this lighting is Toff, the upper limit power value to be supplied is Pm, and A to D and a to c are: Assuming that the constant is determined by the type of the high-intensity discharge lamp, the initial supply power Po is "Calculate the initial supply power Po at the start of lighting" in S6, "start operation of the DC-DC converter circuit and the inverter circuit" in S7, and start measuring the "lighting period Ton" in S8 using the power equation "

Subsequently, assuming that the initial supply power of the high-intensity discharge lamp is Po and the upper limit power supply value is Pm, a and c are constants determined by the type of the high-intensity discharge lamp, Supply power Pt to be supplied to the high-intensity discharge lamp at the elapsed time t of The power curve is calculated by the power equation as follows, and “D
Control is performed to adjust the output of the C-DC converter circuit to the curve of the power Pt.

S10 "Turn off lamp switch"
Then, the operation of the DC-DC converter circuit and the inverter circuit is stopped in S11, and the “lighting period To” in S12.
n is finished and stored in the memory ”, and S13
"Start measurement of light-off period Toff".

When the light-off period Toff has passed a predetermined time, "measurement of the light-off period Toff is completed" in S14 at that time, and the light-off period Toff up to that time is ended.
The time of off is stored in the memory.

Here, if the lighting switch is turned ON again only after a short time within a predetermined time after the light is turned off, the current "end of measurement of light-off period Toff" in S14 is performed.
Then, the light-off period Toff is stored in the memory. Then, the process passes the "check lamp type, etc." of S3 and the "initial setting" of S4, and proceeds to the flow from "read the previous lighting period Ton and light-off period Toff from the storage memory" of S5. The operation as described above is performed.

The predetermined turning-off period is, for example, about 3 minutes for a headlight lamp of an automobile, and the microcontroller 6 can operate normally for a period of time longer than the predetermined turning-off period even after turning off the lamp lighting switch. It has a backup power supply. As the backup power supply, a super capacitor (not shown) is used in the embodiment, but a battery such as a small lithium battery or a small storage battery may be used.

Next, FIG. 3 shows an initial supply power Po to be supplied when a headlight lamp of an automobile, which is a high-intensity discharge lamp, is started from a cold start, and a supply power Pt to be supplied to the high-intensity discharge lamp after lighting. And a curve B indicating the illuminance of the high-intensity discharge lamp at that time.

The left vertical axis shows the ratio of the supplied power when the steady lighting is set to 100%.
%, And the horizontal axis represents the time t elapsed from the start of lighting.

When the lamp lighting switch is turned on, power is supplied to the high-intensity discharge lamp for a first few seconds at a predetermined value Pm, which is about three times that during steady-state lighting. Draw, supply power Pk at steady lighting in about 1 minute
Reach

After the high-intensity discharge lamp is turned on, the supply power Pt is rapidly reduced. However, in the first half of the time from immediately after lighting to the steady lighting power, the power that is greatly reduced compared to the latter half is supplied.

With such a power supply curve, the illuminance of the high-intensity discharge lamp rapidly rises to about 110% of the steady lighting in the first few seconds as shown in FIG. After that, the luminance decreases to about 90% of the time, but thereafter gradually increases to the value of the luminance at the time of steady lighting, and can be reduced to the luminance at the time of steady lighting.

Although the embodiment has been described using a headlight lamp of an automobile, a lamp of a high-intensity discharge lamp for various uses such as a drama lighting, a spotlight and a flashing lighting may be used as the initial supply lamp described above. Appropriate power can be calculated and supplied to the power Po and the power Pt to be supplied to the high-intensity discharge lamp at the elapsed time t by using the power formula.

[0057]

The present invention has the above-described features, and a plurality of time constants in which a capacitor and a resistor are combined in such a conventional lighting device, which are necessary for reducing the supply power. Optimal power for relighting start even when lighting and turning off are repeated in a very short time, such as eliminating the circuit and capacitor charging circuit, etc. Supply can be made.

[Brief description of the drawings]

FIG. 1 shows an embodiment of a circuit system according to an embodiment of the present invention.

FIG. 2 shows a flowchart in the present invention.

FIG. 3 shows a change in an electric power curve and illuminance in the present invention.

[Explanation of symbols]

1 ... input power supply 2 ... DC
-DC converter circuit 3 ... Inverter circuit 4 ... High voltage generator (igniter) 5 ... Lamp (tube) 6 ... Microcontroller 10 ... Lighting device

Claims (11)

[Claims] 1. A lighting method for quickly raising the brightness of a high-intensity discharge lamp, comprising: an extinguishing period Toff in which the high-intensity discharge lamp is extinguished before lighting;
A method of lighting a high-intensity discharge lamp, comprising calculating and controlling an initial supply power Po to be supplied when the high-intensity discharge lamp is turned on and started, using a length of on as a factor. 2. The method for lighting a high-intensity discharge lamp according to claim 1, wherein the initial supply power Po is equal to or higher than the supply power Pk at the time of steady operation of the high-intensity discharge lamp and equal to or lower than an upper limit power value Pm. The initial supply power Po decreases as the lighting period Ton last lit increases, and the initial supply power Po increases as the turn-off period Toff, which has been turned off before lighting, increases. How to turn on the discharge lamp. 3. The lighting method for a high-intensity discharge lamp according to claim 1, wherein the initial supply power Po is set when the light-off period Toff, which has been turned off before lighting, is longer than a predetermined time. Is approximately 3 of the supply power Pk during the steady lighting.
A method for lighting a high-intensity discharge lamp, characterized in that the power is doubled. 4. The method of lighting a high-intensity discharge lamp according to claim 1, wherein the initial supply power Po is such that the lighting period Ton, which was lit last time, is longer than a predetermined length. A method of lighting a high-intensity discharge lamp, wherein the power is substantially constant. 5. The lighting method of a high-intensity discharge lamp according to claim 1, wherein the off-period period in which the high-intensity discharge lamp has been turned off before lighting is Toff, and the last lighting is performed. Assuming that the lighting period is Ton and the upper limit power value to be supplied is Pm, and A to D and a to c are constants determined by the type of the high-intensity discharge lamp, the initial supply power Po
But, A method for lighting a high-intensity discharge lamp, characterized in that: 6. The method of lighting a high-intensity discharge lamp according to claim 1, wherein after the high-intensity discharge lamp is turned on, the length of the elapsed lighting time t is used as a factor. A lighting method for a high-intensity discharge lamp, comprising calculating and controlling supply power Pt to be supplied to the discharge lamp. 7. The method for lighting a high-intensity discharge lamp according to claim 6, wherein after the high-intensity discharge lamp is turned on, the supply power P
A method for lighting a high-intensity discharge lamp, wherein t is greatly reduced in the first half of the time to supply power Pk during steady-state lighting compared to the latter half. 8. The method for lighting a high-intensity discharge lamp according to claim 6, wherein the initial supply power is Po, the upper limit power value to be supplied is Pm, and a and c are values of the high-intensity discharge lamp. Assuming a constant determined by the type, the supply power Pt to be supplied to the high-intensity discharge lamp at the elapsed time t after the high-intensity discharge lamp is turned on is: A method for lighting a high-intensity discharge lamp, characterized in that: 9. The lighting method for a high-intensity discharge lamp according to claim 1, wherein a power calculation expression is calculated based on input information of a type of the high-intensity discharge lamp to be used and a use purpose. A lighting method for a high-intensity discharge lamp, comprising selecting and controlling the initial supply power Po and the supply power Pt to be supplied after lighting, which are optimal for the type and use of the high-intensity discharge lamp. 10. A lighting device for rapidly raising the brightness of a high-intensity discharge lamp, wherein a lighting period Ton in which the high-intensity discharge lamp is turned on and a light-off period Toff in which the high-intensity discharge lamp is turned off are measured and stored. Means, an input DC-DC converter circuit, an inverter circuit, and a high-voltage generating unit, wherein the high-intensity discharge lamp is extinguished before the extinguishing period To.
a program for calculating and controlling an initial supply power Po to be supplied when the high-intensity discharge lamp is started to be lighted, using a factor of ff and the length of the light-on period Ton that was lighted last time, and an elapsed time t after the light-on. And a program for calculating and controlling supply power Pt to be supplied to the high-intensity discharge lamp after the high-intensity discharge lamp is turned on as a factor. 11. The lighting device for a high-intensity discharge lamp according to claim 10, further comprising input means for inputting the type of the high-intensity discharge lamp to be used and input information of a use application, wherein the type of the high-intensity discharge lamp is provided. And the initial supply power Po that is optimal for the intended use
And a microcontroller storing the program for calculating and controlling the supply power Pt.