JP4428010B2 - Discharge lamp lighting device - Google Patents

Description

    The present invention relates to a discharge lamp lighting device for a high-intensity discharge lamp (HID) such as a metal halide lamp.

Conventionally, when the lamp temperature is cold, the HID has been problematic in that it takes time from the start of power input until it is lit stably. A discharge lamp lighting device for solving this problem and lighting in a short time is disclosed in Japanese Patent Laid-Open Nos. 9-82480, 2002-235899, and 2001-284094. As shown in FIG. 30, this device includes a power conversion device that converts a power supply voltage to a voltage level required by the HID 5, and a starting circuit that receives the output of the power conversion device and starts the HID 5. . The power conversion apparatus includes a converter 2 that converts the voltage of the power source 1, an inverter 3 that converts the voltage from the converter 2 into a rectangular wave voltage, and a power control unit 7 that controls the output power of the converter 2. . The starting circuit is an igniter 4 that generates a high voltage during starting. FIG. 31 shows a temporal change in electric power from the start of inputting the electric power of the discharge lamp lighting device to the stable lighting. First, the starting power at the rated time, which is larger than the rated power at the steady lighting, is output, and then the transitional power at the rated time that continuously shifts to the rated stable power at the stable lighting of the HID5 is output. In this way, the stable power at the rated time is maintained thereafter, so that the HID 5 can be turned on in a short time.
JP-A-9-82480 JP 2002-235899 A JP 2001-284094 A

  However, when dimming with a discharge lamp lighting device, once the HID is stably lit with rated stable power and then dimmed by reducing the power, the HID once shines brightly and becomes slightly darker It made me feel uncomfortable. Further, in this case, there is a problem that the lamp life of the HID is shortened. On the other hand, if the starting power during dimming and the shift power during dimming are reduced, there is a problem that the HID disappears or flickers.

  The present invention has been made in view of such a reason, and its object is to have a dimming function, which can be turned on with no sense of incongruity, and further, the HID disappears or flickers. An object of the present invention is to provide a discharge lamp lighting device that does not occur.

In order to solve the above problems, a discharge lamp lighting device according to the present invention includes a power source, a power conversion device that converts a voltage of the power source into a voltage required by a discharge lamp, and an output of the power conversion device. A starting circuit that starts lighting the discharge lamp, a power control unit that controls the output power of the power converter, and a dimming unit that dimmes the luminous flux of the discharge lamp when stably lit, The power control unit outputs rated starting power at the start of lighting of the discharge lamp from the power conversion device, and subsequently transitions to rated power at the time of stable lighting of the discharge lamp. And a stable lighting means for holding the stable power at the rated time, and when the dimming signal is received, the dimming output power at the stable lighting is smaller than the rated stable power. Reduce to stable power In the discharge lamp lighting device having dimming means, the power control unit outputs dimming start power that is equal to or less than the rated start power and then continuously shifts to the dimming stable power. a dimming time of transition when the power transient power control means during dimming to output to, Ri na a stable lighting means during dimming to maintain a stable power during the dimming, the dimming time of starting power, the It is below the rated starting power, and the dimming starting power is larger than the dimming stable power.

  The power control unit of the discharge lamp lighting device according to the present invention outputs dimming start power equal to or less than the rated start power, and then outputs dimming transition power that continuously shifts to dimming stable power. Because it has a dimming transient power control means and a dimming stable lighting means that holds stable power during dimming, it has a dimming function and can be turned on without any discomfort. Furthermore, the present invention provides a discharge lamp lighting device in which HID does not disappear or flicker.

(Embodiment 1)
The discharge lamp lighting device of this embodiment is demonstrated based on FIG. As shown in FIG. 1, the discharge lamp lighting device of the present embodiment includes a power source (battery) 1, a converter (DC-DC converter) 2, an inverter 3, an igniter 4, and an HID (discharge lamp). ) 5, a power supply voltage monitoring unit 6, and a power control unit 7. Here, the power conversion device that converts the voltage of the power supply 1 to a voltage level required by the HID is composed of an inverter 2 that converts the power supply voltage and an inverter 4 that converts the voltage from the inverter into a rectangular wave voltage. ing. The starting circuit that receives the output of the power converter and starts the HID 5 is configured by an igniter 4 that generates a high voltage at the time of starting.

  First, when a power switch of the discharge lamp lighting device is turned on in a state where a predetermined dimming signal is output, a high voltage of several tens of kV generated by the igniter 4 is applied to the HID 5. And the insulation between the electrodes of HID5 breaks down and causes arc discharge. As shown in FIG. 2B, in the starting state after this, the dimming start power is output from the converter 2 by the dimming transient power control means of the power control unit 7, and the HID 5 continues to discharge. Lights up. After the dimming start power is output for a predetermined time, the output power is reduced to the HID 5 (shift power during dimming), and shifts to stable power during dimming. In this stable lighting state, the stable lighting is constantly continued by holding the output power from the converter 2 in the stable power during dimming by the stable lighting means during dimming of the power control unit 7. In this way, the power control unit controls the converter 2 so that the output is shifted to the stable lighting power after the predetermined transient power is output in the transient state from the start lighting of the HID 5 to the stable lighting. 7. Furthermore, the light control section 9 adjusts the luminous flux of the HID 5 during stable lighting. Below, the electric power control part 7 and the light control part 9 are demonstrated.

  First, the power control unit 7 includes a power command generation unit 71, a current command calculation unit 72, a maximum current limit unit 73, an error amplifier 74, a maximum power limit unit 75, and a minimum power limit unit 77. First, the power command generation unit 71 outputs a power command generation value, and limits the power command generation value to a minimum power limit via a constant current circuit that is turned ON / OFF by a lighting permission signal from the power supply voltage monitoring unit 6. This is output to the unit 77. The power command generation unit 71 generates a power command generation value that linearly decreases with the passage of time as shown in FIG. 2A, and a capacitor, a resistor, and a transistor are also connected by a digital circuit such as a microcomputer. It can also be realized by a combined analog circuit. The power command generated value is input to the minimum power limiting unit 77, and a numerical value obtained by limiting the minimum value of the power command generated value is output to the maximum power limiting unit 75 as a lower limit limited output power command value.

  Further, a numerical value obtained by limiting the maximum output power by the maximum power limiting unit 75 is input to the current command calculation unit 72. Then, the current command calculation unit 72 outputs an output power command value converted into an output current using the detected output voltage to the maximum current limiting unit 73. Then, an output power command value in which the maximum value of the output current is limited by the maximum current limiting unit 73 is determined. The output power command value and the actually detected output current of the converter 2 are compared by the error amplifier 74, and the output current of the converter 2 is controlled by an output control signal corresponding to the error amount. By controlling the output power of the converter 2 using the dimming transient power control means of the power control unit 7 as described above, the output power to the HID 5 is adjusted from the dimming start power to the dimming transition power. By shifting to stable power during light, it is steadily lit so that it does not go out. Furthermore, after the HID 5 is stably lit, the dimming stable power corresponding to the output power command value determined by the minimum power limiting unit 74 by the dimming signal from the dimming unit 9 is continuously output from the converter 2. With such a dimming stable lighting means, HID5 stable lighting is maintained. That is, when the light flux is changed by the dimming signal from the dimming unit 9 from FULL lighting, which is the maximum light flux, to DIM lighting, which is the minimum light flux, (a) → (b) → ( As shown in c) → (d), the output power command value to the HID 5 changes, and power proportional to this is output from the converter 2.

Here, in the FULL lighting at the time of dimming, when the HID5 luminous flux 15 minutes after the start is assumed to be 100%, the following luminous flux is given in order to prevent the light from disappearing or flickering. It is necessary to output power to HID5.
Within 1 to 4 seconds after startup 25 to 150%
More than 4 seconds after starting 80-130%
The power control unit of the discharge lamp lighting device of the present embodiment outputs dimming start power that is equal to or lower than the rated start power, and thereafter, the dimming transition power that continuously shifts to the dimming stable power. Since it has the dimming transient power control means to output and the dimming stable lighting means for holding the dimming stable power, the HID disappears or flickers even when dimming. Nothing will happen.

  In addition, the dimming start power is power that can stably light the discharge lamp with the dimming stable power through the dimming transition power, so that the light is dimmed to the minimum luminous flux. However, the HID can be lit stably.

  Furthermore, since the starting power at the time of dimming is larger than the stable power at the time of rating, even when dimming to the state of the minimum luminous flux, it becomes slightly dark after the HID once shines brightly at the first lighting, You don't feel uncomfortable.

  In addition, the power control unit outputs power that is larger than the rated stable power for a predetermined time in a transient state, then reduces the power at a constant rate toward the stable lighting power, and shifts to the stable lighting power. Therefore, even when the light is dimmed to various light fluxes, it does not make the user feel uncomfortable because the HID becomes slightly dark after it is once brightly lit at the first lighting.

  In addition, the power control unit outputs dimming start power, and then outputs dimming transition power so as to reduce the output power at a constant rate of time reduction until the dimming stable power. Since the time transient power control means is provided, even when the light is dimmed to various luminous fluxes, it does not feel uncomfortable by being slightly dark after the HID once shines brightly at the first lighting.

(Embodiment 2)
The discharge lamp lighting device of Embodiment 2 is demonstrated based on FIGS. Since the block diagram of the discharge lamp lighting device of the present embodiment is substantially the same as that of the first embodiment, a description thereof will be omitted. In the dimming transient power control means of this embodiment, the temporal change of the power command generation value output from the power command generation unit 71 is different from that of the first embodiment. As shown in FIG. 3A, the power command generation value decreases at a first decrease rate until a predetermined time, and then decreases at a second decrease rate. As a result, as shown by the thick line in FIG. 3B, the output power command value is decreased corresponding to the power command generation value after holding the numerical value corresponding to the dimming start power for a predetermined time. . Thereafter, when the value is reduced to a predetermined threshold power correspondence value, the power reduction rate is further reduced and further reduced. Then, when a predetermined value corresponding to stable power during dimming is reached, the value is held. In other words, when the dimming stable power by the dimming signal is equal to or higher than the threshold power (in FIG. 3B, (a) and (b) correspond), the time change is the same as in the first embodiment. On the other hand, when the minimum power by the dimming signal is less than or equal to the threshold power (in FIG. 3B, (c) and (d) correspond), the reduction is performed in two stages. The converter 2 outputs power proportional to the output power command value indicated by the thick line in FIG.

  The power control unit of the discharge lamp lighting device of the present embodiment outputs the starting power at the time of dimming, and thereafter the power at the time of dimming transition that continuously shifts at a constant reduction rate to the stable power at the time of dimming. When the power is output and then becomes lower than the predetermined threshold shift power, the dimming is performed so that the output power is reduced at a temporal decrease rate smaller than the constant decrease rate until the dimming stable power is reached. Since the dimming transient power control means for outputting the transition power is provided, it is possible to further suppress the occurrence of turning off and flickering during dimming.

  Furthermore, dimming transient power control means for changing the output power depending on the relationship between the lamp voltage of the HID5 and the threshold power as shown in FIG. 4 is added to the power control unit of the discharge lamp lighting device of the present embodiment. Let As a result, the power command generation value is as shown in FIG. 5 (a), and the output power command value is as shown by the thick line in FIG. 5 (b) from that of the discharge lamp lighting device of the present embodiment described above. However, it gradually changes over time regardless of the lamp voltage of the HID.

  In the discharge lamp lighting device according to the present embodiment, the threshold power is variable depending on the voltage of the HID lamp voltage. Therefore, it is possible to further suppress the occurrence of extinction and flicker during dimming regardless of the HID lamp voltage.

(Embodiment 3)
The discharge lamp lighting device of Embodiment 3 is demonstrated based on FIG. The block diagram of the discharge lamp lighting device of the present embodiment is substantially the same as that of the first embodiment. However, as shown in FIG. 6, in the power control unit 7, the power command calculation is performed behind the power command generation unit 71. The difference is that the unit DIM 78 is added and the minimum power command unit 76 is added instead of the maximum power limiting unit. As shown in FIG. 7A, the power command generation value generated by the power command generation unit 71 of the present embodiment is curved (that is, the rate of decrease over time) as in the conventional discharge lamp lighting device. When it reaches a predetermined value, it keeps this value. And converter 2 outputs electric power in proportion to this output electric power command value.

  The power control unit of the discharge lamp lighting device according to the present embodiment outputs the starting power at the time of dimming, and then adjusts so that the time decrease rate decreases to the stable power at the time of dimming as time elapses. Since the dimming transient power control means for outputting the light transition power is provided, the power can be reduced in a short time. Therefore, the time until stable lighting can be shortened.

(Embodiment 4)
The discharge lamp lighting device of Embodiment 4 is demonstrated based on FIGS. The discharge lamp lighting device of the present embodiment is substantially the same as that of the first embodiment, but as shown in FIG. 8, a power command generator, a power command calculator, a maximum power limiter, a current command calculator, a maximum The difference is that the operations and functions of the current control unit and error amplifier are implemented by the power control unit 8 using a microcomputer. The microcomputer of the power control unit 8 operates in a flowchart as shown in FIG. That is, as shown in FIG. 10A, a plurality (four in this embodiment) of power transfer curves stored in advance in the ROM (corresponding to (1) to (4) in FIG. 10A). The output power command value is controlled accordingly. That is, according to the dimming signal, one of the power transition curves (1) to (4) is selected, and the output time of the dimming start power is changed as shown in FIG. By such a dimming transient power control means, output power command values as shown in (1) to (4) of FIG. 11A are output, and power proportional to this is output from the converter 2. At this time, as shown in FIG. 11B, the light flux of HID5 is the same as that at the time of FULL lighting regardless of the dimming signal, and maintains a constant light flux after reaching a predetermined light flux. be able to.

  Since the power control unit of the discharge lamp lighting device of the present embodiment has the dimming transient power control means that can vary the time for outputting the starting power during dimming in a curved manner according to the stable power during dimming. Regardless of the dimming signal, the rise of the luminous flux is the same as when FULL is turned on, and a constant luminous flux can be held after reaching a predetermined luminous flux. Therefore, the initial rise of the luminous flux does not change even during dimming, and it is difficult to give a sense of discomfort.

  Furthermore, since the power control unit has a dimming transient power control means capable of changing the time for outputting the dimming start power in a curve according to the dimming stable power, the effect can be further increased. It can be certain.

(Embodiment 5)
The discharge lamp lighting device of Embodiment 5 is demonstrated based on FIG. The block diagram of the discharge lamp lighting device of the present embodiment is substantially the same as that of the third embodiment. However, as shown in FIG. The difference is that the calculation unit DIM 78 and the maximum power limiting unit 75 are controlled. That is, by the dimming signal from the dimming unit 9, the power command calculation unit DIM 78 changes the dimming stable output, and the maximum power limiting unit 75 changes the maximum power limit value.

  Thereby, according to a light control signal, as shown to Fig.13 (a), the electric power command generation value is changed over time. Furthermore, the output power command value as shown in FIG. 13B is output, thereby changing the light control start power and the output time. As a result, as shown in FIG. 13C, the HID5 luminous flux can be made to have a constant time to reach a predetermined luminous flux regardless of the dimming signal. For this reason, it becomes difficult to give a sense of incongruity without changing the time until the first rise of the luminous flux even during light control.

(Embodiment 6)
The discharge lamp lighting device of Embodiment 6 is demonstrated based on FIGS. The discharge lamp lighting device of the present embodiment is substantially the same as that of the fourth embodiment. However, as shown in FIG. 14, the maximum MIN restriction is applied to the output of the ROM inside the power control unit 8 using a microcomputer. A function is added. Further, the microcomputer of the power control unit 8 operates in a flowchart as shown in FIG. For this reason, as shown in FIG. 16, the time change of the output power command value holds a predetermined value corresponding to the stable power value during dimming according to the dimming signal. Therefore, so-called “flux overshoot” in which the luminous flux temporarily increases can be suppressed without changing the output time of the starting power during dimming.

  Furthermore, the time change of the power command value is set as shown in FIG. 18 by adding to the power control unit 8 a function to change the stable power during dimming according to the lamp voltage of HID5 as shown in FIG. can do. Therefore, the lamp voltage is suppressed from becoming a predetermined value (115 V in the present embodiment) or less, and stable light control can be performed regardless of changes in HID over time.

(Embodiment 7)
The discharge lamp lighting device of Embodiment 7 is demonstrated based on FIGS. The discharge lamp lighting device of the present embodiment is substantially the same as that of the fifth embodiment. However, as shown in FIG. 19, the maximum power MIN limit with respect to the output of the ROM inside the power control unit 8 using a microcomputer. The function is added. The microcomputer of the power control unit 8 operates in a flowchart as shown in FIG. For this reason, as shown in FIG. 21A, the output power command value is controlled so as not to be less than the maximum power MIN value. In other words, as the dimming signal becomes smaller, the maximum value of the output power command value (corresponding value for starting power during dimming) and the minimum value (corresponding value for stable power during dimming) decrease (from the power transition curve (1)). (Move to power curve (5)). Further, when the dimming signal becomes small, the maximum value of the power command value does not decrease, and only the application time decreases (the power curve (6) shifts to the power curve (8)). As a result, the temporal change of the luminous flux changes according to the dimming power as shown in FIG.

  In the discharge lamp lighting device of the present embodiment, the minimum value of the power command value is set to a certain value or more. Therefore, even when the dimming power is reduced, the lamp power immediately after lighting can be prevented from excessively decreasing. Thus, it is possible to suppress a decrease in startability.

(Embodiment 8)
The discharge lamp lighting device of Embodiment 8 is demonstrated based on FIGS. The discharge lamp lighting device of the present embodiment is substantially the same as that of the fourth embodiment, but as shown in FIG. 22, the lamp current command calculation is performed on the output of the ROM in the power control unit 8 using a microcomputer. A function is added, and a stop time measuring timer 81 and a dimming state storage circuit 82 are added. Here, both the stop time measuring timer 81 and the dimming state storage circuit 82 are a combination of a capacitor, a resistor, and a transistor, and have a function of measuring time according to the charge amount of the capacitor. First, as shown in FIG. 23A, the stop time measuring timer 81 stores the time from when the power source of the discharge lamp lighting device is stopped (turned off) to when it is turned on again as a capacitor voltage value Cv1. . That is, the turn-off time t can be known from Vo, which is a measured value of the capacitor voltage value Cv1.

  Further, as shown in FIG. 23B, the dimming state storage circuit 82 stores the output power at the time of extinction as a capacitor voltage value Cv2. First, the capacitor voltage value Cv2 at the time of extinction depends on the output power and decreases with the passage of time. For example, if the measured values of the capacitor voltage value Cv2 are V1, V2, V3, V4, and V5, respectively, the output power at the time of extinction corresponding to each can be known by performing arithmetic processing with the extinction time t.

  In the operation of the discharge lamp lighting device, as shown in the flowchart of FIG. 24, the output time of the dimming start power is reduced according to the turn-off time and the output power at the turn-off time. That is, first, as shown in FIG. 25 (a), the output time of the dimming starting power is obtained from the turn-off time. Next, as shown in FIG. 25B, the output time of the control power at the time of dimming is obtained by subtracting the amount of reduction in output time determined by the output power at the time of extinction (relative ratio with respect to the maximum value) from the previous output time. Have decided.

  An example of the operation of the discharge lamp lighting device of the present embodiment is shown in FIG. When the light is turned on for the first time and then turned off at time T in the output power state of FIG. 26 (P) and then turned on again after time t, as shown in FIG. After the start power at the time of dimming is output for the output time determined from the output power, it shifts to the shift power at the time of dimming. That is, when the light is turned on again, the output time of the dimming start power is shorter than the time when the light is first turned on according to the turn-off time and the turn-off power.

  The discharge lamp lighting device of the present embodiment stores the stable lighting power or dimming signal when the power conversion device is extinguished, and depending on the stable lighting power or dimming signal when extinguishing at the time of restart, Since the output power immediately after the restart is variable, it is possible to improve the startability and the start-up characteristics when restarting in a short time after stopping the power supply of the discharge lamp lighting device.

(Embodiment 9)
The discharge lamp lighting device of Embodiment 9 is demonstrated based on FIGS. The discharge lamp lighting device of the present embodiment is substantially the same as that of the fourth embodiment, but as shown in FIG. 27, a power transition curve calculation unit for the output of the ROM in the power control unit 8 using a microcomputer. In addition, the function of limiting the maximum power MIN is added, and the power transition curve calculation unit is controlled by the dimming unit 9. In the operation of the discharge lamp lighting device, as shown in the flowchart of FIG. 28, the output power is set by calculating the value of the power transition curve stored in advance in the ROM based on the dimming voltage. That is, the output power at the time of arbitrary dimming is (the setting value of the stored power transition curve × the dimming voltage / the rated power). Furthermore, when the maximum power MIN value is set, if the start power during dimming is a value that is less than or equal to the maximum power MIN value as a result of the calculation process, the output time of the start power during dimming should be shortened. It corresponds with. As a result, as shown in FIG. 29 (a), the output power command value changes with time as (b) → (f) as the stable power at the time of dimming becomes smaller, similar to the rated time (a). do. As a result, the time change of the HID light flux changes from (a) to (f) shown in FIG. 29B according to the stable power during dimming.

  In the discharge lamp lighting device of the present embodiment, the power control unit sets the transient power depending on the numerical value obtained by multiplying the predetermined transient power by the dimming output power and dividing the stable power at the rated time. Therefore, it is possible to easily set the power curve, and the microcomputer used for the power control unit can be made inexpensive.

It is a block diagram of the discharge lamp lighting device of Embodiment 1. It is a figure which shows the time change of the electric power command generation value (a) and output electric power command value (b) of the discharge lamp lighting device of Embodiment 1. FIG. It is a figure which shows the time change of the electric power command generation value (a) and output electric power command value (b) of the discharge lamp lighting device of Embodiment 2. It is a figure which shows the relationship between the lamp voltage of the discharge lamp lighting device of Embodiment 2, and a threshold voltage. It is a figure which shows the time change of the electric power command generation value (a) and output electric power command value (b) of the other discharge lamp lighting device of Embodiment 2. FIG. It is a block diagram of the discharge lamp lighting device of Embodiment 3. It is a figure which shows the time change of the electric power command generation value (a) and output electric power command value (b) of the discharge lamp lighting device of Embodiment 3. It is a block diagram of the discharge lamp lighting device of Embodiment 4. 6 is a flowchart illustrating an operation of the discharge lamp lighting device according to the fourth embodiment. It is the figure (a) which shows the time change of the electric power transition curve of the discharge lamp lighting device of Embodiment 4, and the figure (b) which shows the relationship between the output time of the start electric power at the time of light control, and the stable electric power at the time of light control. It is a figure which shows the time change of the output electric power command value (a) and luminous flux (b) of the discharge lamp lighting device of Embodiment 4. It is a block diagram of the discharge lamp lighting device of Embodiment 5. It is a figure which shows the time change of the electric power command generation value (a), output electric power command value (b), and light beam (c) of the discharge lamp lighting device of Embodiment 5. It is a block diagram of the discharge lamp lighting device of Embodiment 6. It is a flowchart which shows operation | movement of the discharge lamp lighting device of Embodiment 6. It is a figure which shows the after power curve corresponding to the output electric power command value of the discharge lamp lighting device of Embodiment 6. It is a figure which shows the relationship between the lamp voltage of the discharge lamp lighting device of Embodiment 6, and the minimum electric power limit value. It is a figure which shows the time change of the output electric power command value of the discharge lamp lighting device of Embodiment 6. It is a block diagram of the discharge lamp lighting device of Embodiment 7. It is a flowchart which shows operation | movement of the discharge lamp lighting device of Embodiment 7. It is a figure which shows the time change of the electric power command generation value (a) of the discharge lamp lighting device of Embodiment 7, and the light beam (b). It is a block diagram of the discharge lamp lighting device of Embodiment 8. It is a figure which shows the time change of the capacitor | condenser voltage of the extinction time timer (a) of the discharge lamp lighting device of Embodiment 8, and the light control state preservation | save circuit (b). It is a flowchart which shows operation | movement of the discharge lamp lighting device of Embodiment 8. The figure (a) which shows the relationship between the dimming start electric power holding reduction time and the extinction time of the discharge lamp lighting device of Embodiment 8, and the relationship between the dimming start electric power hold reduction time and the dimming stable power during extinction It is a figure (b) shown. It is a graph which shows the time change of the output electric power of the discharge lamp lighting device of Embodiment 8. It is a block diagram of the discharge lamp lighting device of Embodiment 9. 10 is a flowchart illustrating an operation of the discharge lamp lighting device according to the ninth embodiment. It is a figure which shows the time change of the electric power command generation value (a) of the discharge lamp lighting device of Embodiment 9, and the light beam (b). It is a block diagram of the discharge lamp lighting device of a prior art example. It is a graph which shows the time change of the output electric power of the discharge lamp lighting device of a prior art example.

Explanation of symbols

1 Input power supply (battery)
2 Converter 3 Inverter 4 Igniter 5 HID (Lamp)
6 power supply voltage monitoring unit 7 power control unit 71 power command generation unit 72 current command calculation unit 73 maximum current control unit 74 error amplifier 75 maximum current limit unit 76 minimum power limit unit 77 minimum power limit unit 78 power command calculation unit DIM
8 Microcomputer (Power control unit)
81 Stop time measuring timer 82 Dimming state storage circuit 9 Dimming unit

Claims (14)

A power converter, a power converter that converts the voltage of the power source into a voltage required by the discharge lamp, a starting circuit that receives the output of the power converter and starts lighting the discharge lamp, and output power of the power converter A power control unit for controlling the light source, and a light control unit for dimming the luminous flux of the discharge lamp when stably lit, the power control unit from the power conversion device at the start of lighting of the discharge lamp A transient power control means for outputting a starting power at the rated time, and thereafter outputting a transition power at the rated time that continuously shifts to the stable power at the rated time when the discharge lamp is stably lit, and holding the stable power at the rated time Discharge lamp lighting comprising a stable lighting means and, when receiving a dimming signal, a dimming means for reducing the output power during stable lighting to a stable power during dimming that is smaller than the rated stable power In the apparatus, the power The control unit outputs dimming start power equal to or lower than the rated start power, and then outputs dimming transition power that continuously shifts to the dimming stable power. means and, Ri Na has a stable lighting means during dimming to maintain a stable power during the dimming, the dimming time of starting power, said not more than the rated time of starting power, and the dimming time starting power Is larger than the stable power at the time of dimming .   2. The discharge lamp according to claim 1, wherein the dimming start power is power that can stably light the discharge lamp with the dimming stable power through the dimming transition power. Lighting device.   The discharge lamp lighting device according to claim 1 or 2, wherein the dimming start power is larger than the rated power.   The power control unit outputs the start power at the time of dimming, and then outputs the transition power at the time of dimming so as to reduce the output power at a constant reduction rate until the stable power at the time of dimming. The discharge lamp lighting device according to any one of claims 1 to 3, further comprising power control means.   The power control unit outputs the starting power at the time of dimming, and then outputs the power at the time of dimming transition that continuously shifts to the stable power at the time of dimming at a constant reduction rate, and thereafter When the power becomes lower than the threshold shift power, the dimming shift power is output so that the output power is reduced at the second decrease rate smaller than the constant decrease rate until the dimming stable power. The discharge lamp lighting device according to any one of claims 1 to 3, further comprising light transient power control means.   The discharge lamp lighting device according to claim 5, wherein the threshold shift power is variable depending on a voltage of the discharge lamp.   The power control unit outputs the dimming start power, and then outputs the dimming transition power so that the rate of decrease decreases with the passage of time until the dimming stable power. The discharge lamp lighting device according to any one of claims 1 to 3, further comprising light transient power control means.   5. The dimming transient power control means capable of varying a time for outputting the dimming start power according to the dimming stable power according to the power control unit. Item 8. A discharge lamp lighting device according to Item 7.   The power control unit includes a dimming transient power control unit capable of changing a time for outputting the dimming start power in a curved manner according to the dimming stable power. 9. The discharge lamp lighting device according to 8.   The power control unit includes dimming transient power control means for outputting the dimming start power and the dimming transition power according to a ratio between the dimming stable power and the rated stable power. The discharge lamp lighting device according to any one of claims 1 to 9, wherein the discharge lamp lighting device is configured as described above.   The power control unit includes a dimming stable lighting unit that makes the dimming stable power equal to or higher than the electric power at which the discharge lamp does not turn off or flicker. The discharge lamp lighting device according to claim 10.   12. The discharge lamp lighting device according to claim 11, wherein the dimming stable power is variable depending on a lamp voltage of the discharge lamp.   The power control unit stores the stable lighting power or dimming signal immediately before the power converter stops operation, and adjusts immediately after restarting according to the stable lighting power or dimming signal during restart. The discharge lamp lighting device according to any one of claims 1 to 12, further comprising a dimming transient power control means for changing the light starting power and the dimming transition power. The power control unit stores the stable lighting power or dimming signal immediately before the power converter stops operation, and according to the stable lighting power or dimming signal and the operation stop time at the time of restart, 14. The discharge lamp according to claim 1, further comprising dimming transient power control means for changing the dimming start power and dimming transition power immediately after restart. Lighting device.

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