JP2012113881A - Lighting device and luminaire using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lighting device which can suppress a rise of its temperature by reducing circuit loss and keep lighting, even where it is used with a plurality of power sources whose power source voltages are different from each other, and provide a luminaire using the lighting device.SOLUTION: A lighting device comprises a first converter unit 2, a second converter unit 3, and a control unit 4 for controlling the first converter unit 2 and the second converter unit 3. The control unit 4 includes: a power source voltage detection portion 45 for detecting an output voltage of an input power source; and a lamp voltage detection portion 42 for detecting a lamp voltage V2 applied to a high-pressure discharge lamp 100, and performs: a setting control for setting an input voltage V1 which is an output voltage of the first converter unit 2 after a start-up of the high-pressure discharge lamp 100, based on a power source voltage detected by the power source voltage detection portion 45; and a variable control for varying the input voltage V1 set in the setting control, based on the lamp voltage V2 detected by the lamp voltage detection portion 42.

Description

  The present invention relates to a lighting device for lighting a light source such as a high-pressure discharge lamp and a lighting fixture using the same.

  Conventionally, high-pressure discharge lamps have been widely used as high-intensity, high-power illumination, but a ballast (lighting device) is required to stably light up a high-pressure discharge lamp that is a type of discharge lamp. Become. As a lighting device for a high-pressure discharge lamp, there are mainly a copper-iron type ballast in which a copper wire is wound around an iron core and an electronic ballast using a semiconductor switching element. In recent years, electronic ballasts have become widespread from the viewpoint of energy saving, and miniaturization and cost reduction are achieved year by year. And with the miniaturization of the lighting device, the heat dissipating capability of the lighting device is lowered, and the lighting device is getting high temperature.

  Here, the lighting device may be used in combination with a plurality of power supplies (for example, a 100V power supply and a 200V power supply) having different power supply voltages. The lighting device incorporates a boost converter circuit that boosts the power supply voltage, and this boost converter circuit is usually designed according to the power supply having the higher power supply voltage. For this reason, when the lighting device is used for a power source having a lower power supply voltage, the boost ratio of the boost converter circuit is larger than that used for a power source having a higher power supply voltage, resulting in a larger circuit loss and a further lighting device. However, there was a problem that the temperature became high.

  As a solution to the above problem, the boosted voltage of the boost converter circuit at the time of input of the power supply voltage of 100V is reduced from the boosted voltage at the time of input of the power supply voltage of 200V at the time of load (when the discharge lamp is turned on) A constructed discharge lamp lighting device is disclosed in Patent Document 1.

Japanese Patent No. 3850052

  However, when the boosting voltage of the boosting converter circuit when the power supply voltage of 100 V is input is reduced as in the conventional example described above, only the suppression of the temperature rise of the device due to the reduction of the circuit loss is reduced. Can occur. In other words, the re-ignition voltage rises as the lamp voltage rises due to aging of the electrodes of the high-pressure discharge lamp, and when the voltage exceeds the reduced boost voltage, the high-pressure discharge lamp goes out and cannot be lit. There is a fear.

  Of course, if the above problem is solved, the boost voltage of the boost converter circuit may be set to approximately twice the maximum lamp voltage during normal lighting of the high pressure discharge lamp in consideration of the re-ignition voltage. However, in this case, since the boosted voltage of the boost converter circuit becomes a high voltage, there is a problem that the effect for the original purpose of reducing the circuit loss and suppressing the temperature rise of the device is reduced. The maximum lamp voltage during normal lighting of the high-pressure discharge lamp varies depending on the type of the high-pressure discharge lamp (for example, the same output varies depending on the manufacturer, lighting direction, and color temperature). It was difficult to set the voltage.

  The present invention has been made in view of the above points, and even when used for a plurality of power supplies having different power supply voltages, it is possible to reduce circuit loss to suppress an increase in temperature of the apparatus and to maintain lighting. It aims at providing the lighting device which can be used, and a lighting fixture using the same.

  The lighting device of the present invention converts a voltage from an input power source into a predetermined DC voltage and outputs the voltage, and the output voltage of the first converter unit is set to a voltage necessary for lighting a high pressure discharge lamp. A second converter unit that converts and supplies the high-pressure discharge lamp to the first converter unit; and a control unit that controls the first converter unit and the second converter unit, wherein the control unit outputs an output voltage of the input power source. And a lamp voltage detector for detecting a lamp voltage applied to the high pressure discharge lamp, and starting the high pressure discharge lamp based on the power voltage detected by the power voltage detector Later, setting control for setting the output voltage of the first converter unit, and changing the output voltage of the first converter unit set by the setting control based on the lamp voltage detected by the lamp voltage detection unit. And performing a variable control to.

  In this lighting device, it is preferable that the control unit performs the setting control and the variable control after a predetermined time has elapsed after starting the high-pressure discharge lamp.

  In this lighting device, it is preferable that the predetermined time is a time required for the lamp voltage of the high-pressure discharge lamp to rise to a rated lamp voltage.

  In this lighting device, it is preferable that the control unit controls the output voltage of the first converter unit during the variable control so as to be approximately twice the lamp voltage of the high-pressure discharge lamp.

  In this lighting device, it is preferable that the control unit controls the output voltage of the first converter unit during the variable control so that the input power factor of the first converter unit becomes a sufficiently high power factor. .

  The lighting fixture of the present invention includes any one of the lighting devices described above, and a fixture main body that holds the lighting device and the light source.

  The present invention has an effect that even when used for a plurality of power supplies having different power supply voltages, it is possible to reduce the circuit loss to suppress the temperature rise of the apparatus and to maintain the lighting.

It is a circuit diagram which shows Embodiment 1 of the lighting device which concerns on this invention. FIG. 4 is a correlation diagram between an input voltage and a lamp voltage after starting the high-pressure discharge lamp. FIG. 5A is a diagram showing the case where the power supply voltage is 100 V and 200 V, and FIG. FIG. It is a wave form diagram for demonstrating operation | movement in case a power supply voltage same as the above is 100V. It is a wave form chart for explaining operation in case a power supply voltage same as the above is 200V. It is a circuit diagram which shows Embodiment 2 of the lighting device which concerns on this invention. It is a wave form diagram for demonstrating the operation | movement same as the above. It is a circuit diagram which shows Embodiment 3 of the lighting device which concerns on this invention. It is a wave form diagram for demonstrating the operation | movement same as the above. It is a correlation diagram of the input voltage and lamp voltage for demonstrating other operation | movement in each embodiment of the lighting device which concerns on this invention. (A)-(c) is the schematic which shows embodiment of the lighting fixture which concerns on this invention.

(Embodiment 1)
Hereinafter, Embodiment 1 of the lighting device according to the present invention will be described with reference to the drawings. As shown in FIG. 1, the present embodiment includes a rectifying unit 1, a first converter unit 2, a second converter unit 3, and a control unit 4. The rectifying unit 1 includes a diode bridge, and full-wave rectifies an AC voltage supplied from an AC power supply AC1 (input power supply) and outputs the rectified voltage to the first converter unit 2 at the subsequent stage.

  The first converter unit 2 is a so-called step-up chopper circuit having a switching element Q1 made of, for example, an FET, a choke coil CH1, a diode D1, and a smoothing capacitor C1. The first converter unit 2 improves the power factor by boosting the pulsating voltage output from the rectifying unit 1 to a desired DC voltage and outputting it. Since the step-up chopper circuit is conventionally known, detailed description thereof is omitted here.

  The second converter unit 3 is a so-called step-down chopper circuit having four switching elements Q2 to Q5 made of, for example, FETs, a choke coil CH2, and a capacitor C3. In the second converter unit 3, a series circuit of two switching elements Q2 and Q3 and a series circuit of the remaining two switching elements Q4 and Q5 are connected in parallel between the output terminals of the first converter unit 2. Yes. A series circuit of a choke coil CH2 and a capacitor C3 is connected between the connection point of the switching elements Q2, Q3 and the connection point of the switching elements Q4, Q5. Further, a series circuit of the resonance circuit 30 and the high-pressure discharge lamp 100 (light source) is connected in parallel with the capacitor C3. The resonant circuit 30 includes a pulse transformer PT1 connected in series to the high-pressure discharge lamp 100, and a capacitor C2 inserted between the tap of the pulse transformer PT1 and the output terminal on the low potential side of the first converter unit 2. is doing.

  The control unit 4 includes an input voltage detection unit 40 that detects an output voltage of the first converter unit 2, that is, an input voltage (a voltage across the smoothing capacitor C1) V1 to the second converter unit 3. In addition, the control unit 4 includes a first drive control unit 41 that performs switching control of the switching element Q1 of the first converter unit 2 so that the detected input voltage V1 becomes a desired voltage level.

  Further, the control unit 4 detects the output voltage of the second converter unit 3, that is, the lamp voltage V2 applied to the high pressure discharge lamp 100, and the high voltage based on the detected lamp voltage V2. A lighting determination unit 44 that determines whether the discharge lamp 100 is turned on or off. Furthermore, the control unit 4 includes a second drive control unit 43 that performs switching control of the switching elements Q2 to Q5 of the second converter unit 3 so that the detected lamp voltage V2 becomes a desired voltage level.

  The second drive control unit 43 receives the determination result from the lighting determination unit 44, and switches the switching unit 43B that switches the operation mode of the second converter unit 3, and the switching elements Q4 and Q5 according to the detected lamp voltage V2. And a calculation unit 43A that determines the drive frequency and the ON period. The switching unit 43B includes a start mode for outputting a high voltage for starting the high pressure discharge lamp 100 from the second converter unit 3, and a voltage for stably lighting the high pressure discharge lamp 100 from the second converter unit 3. Switch to stable lighting mode to output. The calculation unit 43A controls the switching elements Q4 and Q5 via the switching unit 43B in the stable lighting mode.

  For example, in the stable lighting mode, as shown in FIG. 3, the second drive control unit 43 of the control unit 4 turns on / off the switching elements Q2, Q5, and turns on / off the switching elements Q3, Q4. The period to be used is alternated at a predetermined frequency (several hundred Hz). Here, in the former period, the switching elements Q3 and Q4 are in an off state, and in the latter period, the switching elements Q2 and Q5 are in an off state. In the former period, the second drive control unit 43 turns on / off the switching element Q5 at a predetermined frequency (about several tens of kHz) with the switching element Q2 turned on. In the latter period, the second drive control unit 43 turns on / off the switching element Q4 at a predetermined frequency (about several tens of kHz) while the switching element Q3 is turned on.

  In addition, the control unit 4 includes a power supply voltage detection unit 45 and an input voltage variable unit 46. The power supply voltage detection unit 45 is composed of, for example, a comparator or a microcomputer, and detects the power supply voltage of the AC power supply AC1 based on whether or not the output voltage from the AC power supply AC1 that is an input power supply exceeds a detection threshold. In this embodiment, since a 100V power supply and a 200V power supply are assumed, a detection threshold is set between 100V and 200V in the power supply voltage detection unit 45, and if the detection threshold is exceeded, it is determined that the power supply voltage is 200V. Then, a high level voltage is output (see FIG. 3). Further, the power supply voltage detection unit 45 determines that the power supply voltage is 100 V if it falls below the detection threshold, and outputs a low level voltage (see FIG. 3). Of course, the power supply voltage detection unit 45 may set the detection threshold value more finely and detect more power supply voltages than two types.

  The input voltage variable unit 46 instructs the first drive control unit 41 to set the input voltage V <b> 1 after starting the high-pressure discharge lamp 100 based on the power supply voltage detected by the power supply voltage detection unit 45. The input voltage variable unit 46 determines whether or not the high-pressure discharge lamp 100 has been started in response to the determination result from the lighting determination unit 44. Here, the input voltage V1 after the start of the high-pressure discharge lamp 100 needs to be set to a voltage equal to or higher than the power supply voltage × √2 × 1.2V (1.2 is a margin) so that the input current distortion can be suppressed. is there. For example, if a 100 V power supply is used as the input power supply, the voltage required to suppress the input current distortion is 100 × √2 × 1.2≈170 V or more. If a 200V power supply is used as the input power supply, the voltage required to suppress the input current distortion is 200 × √2 × 1.2≈340V or more.

  Therefore, when the output voltage of the power supply voltage detection unit 45 is at a low level, the input voltage variable unit 46 outputs a control signal that instructs the input voltage V1 after starting the high-pressure discharge lamp 100 to be 170V. It transmits to the drive control part 41. The first drive control unit 41 controls the input voltage V1 to be 170V by switching on / off of the switching element Q1 based on the control signal. Further, when the output voltage of the power supply voltage detection unit 45 is at a high level, the input voltage variable unit 46 outputs a control signal for instructing the input voltage V1 after starting the high-pressure discharge lamp 100 to be 340V. It transmits to the drive control part 41. The first drive control unit 41 controls the input voltage V1 to be 340V by switching on / off of the switching element Q1 based on the control signal. That is, setting control for setting the output voltage (input voltage V1) of the first converter unit 2 after the high-pressure discharge lamp 100 is started by the first drive control unit 41, the power supply voltage detection unit 45, and the input voltage variable unit 46. I do.

  In addition, the input voltage variable unit 46 instructs the first drive control unit 41 to change the input voltage V1 set by the setting control based on the lamp voltage V2 detected by the lamp voltage detection unit 42. Here, the input voltage V1 after starting the high-pressure discharge lamp 100 is set to about twice the lamp voltage V2 in consideration of the re-ignition voltage of the high-pressure discharge lamp 100 so that the high-pressure discharge lamp 100 does not disappear. There is a need.

  For example, it is assumed that the lamp voltage V2 of the high-pressure discharge lamp 100 after startup varies between 0 to 150V. If a 100V power supply is used as the input power supply, the input voltage V1 set by the setting control is 170V. Therefore, if the lamp voltage V2 detected by the lamp voltage detector 42 is 170/2 = 85V or less. The input voltage V1 is kept constant at 170V.

  On the other hand, when the lamp voltage V2 detected by the lamp voltage detector 42 exceeds 85V, the input voltage variable unit 46 gives a control signal for instructing the input voltage V1 to be approximately twice the lamp voltage V2. It transmits to the drive control part 41. The first drive control unit 41 controls the input voltage V1 to be approximately twice the lamp voltage V2 by switching on / off of the switching element Q1 based on the control signal.

  If a 200V power supply is used as the input power supply, the input voltage V1 set by the setting control is 340V, so the input voltage V1 is always approximately twice or more the lamp voltage V2. Therefore, in this case, the input voltage V1 is kept constant at 340V regardless of the lamp voltage V2. That is, the first drive control unit 41, the lamp voltage detection unit 42, and the input voltage unit 46 perform variable control for changing the output voltage (input voltage V1) of the first converter unit 2 after the high pressure discharge lamp 100 is started. Do.

  Here, FIG. 2A shows a correlation diagram between the input voltage V1 and the lamp voltage V2 after starting the high-pressure discharge lamp 100 when the input power source is a 100V power source or a 200V power source. In this embodiment, a 100V power supply or a 200V power supply is assumed as an input power supply. However, even when a 120V power supply or a 242V power supply is used as an input power supply, for example, the above-described setting control and Variable control can be performed.

  Hereinafter, the operation of this embodiment when a 100 V power source is used as the input power source will be described with reference to FIG. FIG. 3 shows a waveform diagram of each part of the high pressure discharge lamp 100 from a non-lighting state to a stable lighting state. First, when a lighting switch (not shown) is turned on when the high pressure discharge lamp 100 is in a non-lighting state and the power is turned on, the first drive control unit 41 of the control unit 4 starts the control operation, and the switching element Q1 is set to several. Switching control to turn on / off at about 10 kHz is performed. As a result, the first converter unit 2 outputs a DC voltage (input voltage V1) obtained by boosting the power supply voltage both when the high-pressure discharge lamp 100 is not lit and when it is lit. Here, the first converter unit 2 suppresses the input current distortion by increasing the input power factor. In addition, when the lighting switch is turned on, the power supply voltage detection unit 45 detects whether the power supply voltage is 100V or 200V. Here, since the input power supply is a 100V power supply, the output voltage of the power supply voltage detector 45 is at a low level.

  When the input voltage V1 reaches a predetermined voltage value, the second drive control unit 43 of the control unit 4 starts operation. At this time, the high-pressure discharge lamp 100 is not yet lit, and its equivalent impedance is a high impedance close to infinity. The switching unit 43B is in the start mode. The second drive control unit 43 alternates a period during which the switching elements Q2, Q5 are on and a period during which the switching elements Q3, Q4 are on at a predetermined frequency f0 (about several hundred kHz). Here, the predetermined frequency f0 is a frequency close to the resonance frequency of the resonance circuit 30, and a sine wave-like high voltage is generated in the primary winding N1 of the pulse transformer PT1. The sinusoidal high voltage generated in the primary winding N1 is boosted by the turn ratio of the primary winding N1 and the secondary winding N2, and the boosted voltage is applied to the high pressure discharge lamp 100 via the capacitor C3. The As a result, the high pressure discharge lamp 100 is broken down and started. At this time, since the high-pressure discharge lamp 100 has a low impedance that is close to a short circuit, the voltage across the high-pressure discharge lamp 100 decreases to approximately 0V.

  On the other hand, the lighting determination unit 44 determines whether the high-pressure discharge lamp 100 is lit or not based on whether or not the lamp voltage V2 detected by the lamp voltage detection unit 42 exceeds a predetermined threshold. That is, when the lamp voltage V2 exceeds the predetermined threshold, the lighting determination unit 44 determines that the high-pressure discharge lamp 100 is in a non-lighting state, and the output voltage becomes a high level. On the other hand, when the lamp voltage is lower than the predetermined threshold, the lighting determination unit 44 determines that the high-pressure discharge lamp 100 is in a lighting state, and the output voltage becomes a low level.

  Here, when the high-pressure discharge lamp 100 is started, the lamp voltage V2 is reduced to substantially 0V as described above, and thus falls below a predetermined threshold value. Therefore, the lighting determination unit 44 determines that the high-pressure discharge lamp 100 is lit, The output voltage becomes low level and is input to the switching unit 43B. Upon receiving this low level voltage signal, the switching unit 43B switches the operation mode from the start mode to the stable lighting mode.

  In the stable lighting mode, as already described above, the second drive control unit 43 determines a period during which the switching elements Q2, Q5 are turned on / off and a period during which the switching elements Q3, Q4 are turned on / off. Are alternated at a frequency f1 (approximately several hundred Hz). Therefore, a rectangular wave AC voltage having a frequency f1 is applied to the high-pressure discharge lamp 100. The high-pressure discharge lamp 100 has a low voltage at both ends (lamp voltage V2) immediately after starting, but the lamp voltage V2 increases to reach the rated voltage as the inside of the lamp becomes high temperature and high pressure, and a stable lighting state is obtained. Note that the calculation unit 43A appropriately controls the drive frequency and on-period of the switching elements Q4 and Q5 based on the input lamp voltage V2. For this reason, appropriate electric power is supplied to the high pressure discharge lamp 100, and the stable lighting state is maintained.

  Here, the output voltage of the lighting determination unit 44 is also input to the input voltage variable unit 46. In the input voltage variable unit 46, when the output voltage of the lighting determination unit 44 is switched from the high level to the low level, the above setting is performed. Start control and variable control. Since the output voltage of the power supply voltage detector 45 is at a low level, the input voltage variable unit 46 performs setting control and variable control when the input power is 100V. Therefore, as shown in FIG. 2A, the input voltage V1 changes according to the correlation with the ramp voltage V2 when the input power supply is 100V.

  Hereinafter, the operation of this embodiment when a 200 V power supply is used as the input power supply will be briefly described with reference to FIG. The difference from the case where a 100V power supply is used as the input power supply is that the output voltage of the power supply voltage detection unit 45 becomes a high level by detecting a power supply voltage of 200V. For this reason, when the output voltage of the lighting determination unit 44 is switched from the high level to the low level, the input voltage variable unit 46 performs setting control and variable control when the input power supply is 200V. Therefore, the input voltage V1 is kept constant at 340V regardless of the ramp voltage V2, as shown in FIG.

  As described above, in the present embodiment, the input voltage V1 after the start of the high pressure discharge lamp 100 is set based on the power supply voltage by the setting control of the control unit 4. For this reason, even when used for a plurality of power supplies having different power supply voltages, it is possible to reduce circuit loss and suppress an increase in temperature of the apparatus. Further, in the present embodiment, the input voltage V1 after the start of the high pressure discharge lamp 100 is changed based on the lamp voltage V2 by the variable control of the control unit 4. For this reason, even if the re-ignition voltage increases as the lamp voltage V2 increases due to the aging of the electrodes of the high-pressure discharge lamp 100, a sufficient voltage is applied to the high-pressure discharge lamp 100 so that the high-pressure discharge lamp 100 does not go out. Can be kept lit.

  That is, in the present embodiment, compared with the case where the boost voltage of the boost converter circuit described in the problem to be solved by the invention is set to a high voltage while preventing the high pressure discharge lamp 100 from turning off and maintaining the lighting, Thus, the effect of reducing the circuit loss can be sufficiently exhibited.

(Embodiment 2)
Hereinafter, Embodiment 2 of the lighting device according to the present invention will be described with reference to the drawings. However, since the basic configuration of the present embodiment is common to that of the first embodiment, common portions are denoted by the same reference numerals and description thereof is omitted. As shown in FIG. 5, the present embodiment is characterized in that a timing unit 47 is provided between the lighting determination unit 44 and the input voltage variable unit 45 to delay the operation of the input voltage variable unit 46.

  The timer unit 47 is constituted by, for example, a microcomputer, and when the output voltage of the lighting determination unit 44 is switched from a high level to a low level, the timer 47 counts a predetermined time T1 from the time of switching. Then, the timer unit 47 outputs to the input voltage variable unit 46 a control signal instructing the start of the operation of the input voltage variable unit 46 after measuring the predetermined time T1. That is, in this embodiment, as shown in FIG. 6, the output voltage of the lighting determination unit 44 is switched from the high level to the low level, that is, the input voltage variable unit 46 operates immediately after the high-pressure discharge lamp 100 starts. Instead, the operation is started after a certain time T1 has elapsed since the start.

  As described above, in this embodiment, setting control and variable control are performed in the control unit 4 after a predetermined time T1 has elapsed after the high-pressure discharge lamp 100 is started. Accordingly, since the input voltage V1 is kept constant at a voltage approximately twice or more as high as the lamp voltage V2 of the high-pressure discharge lamp 100 for a certain time T1 after the high-pressure discharge lamp 100 is started, Disappearance can be prevented more effectively. The fixed time T1 is preferably set to, for example, a time (about 30 to 180 seconds) from when the high-pressure discharge lamp 100 is started until the rated lamp voltage is reached. By setting in this way, setting control and variable control can be performed after the high-pressure discharge lamp 100 shifts to a stable lighting state, so that the high-pressure discharge lamp 100 can be more reliably prevented from turning off.

(Embodiment 3)
Hereinafter, Embodiment 3 of the lighting device according to the present invention will be described with reference to the drawings. However, since the basic configuration of the present embodiment is common to that of the first embodiment, common portions are denoted by the same reference numerals and description thereof is omitted. As shown in FIG. 7, the present embodiment is characterized in that a variable determination unit 48 is provided between the lighting determination unit 44 and the input voltage variable unit 46 to delay the operation of the input voltage variable unit 46.

  The variable determination unit 48 is configured by, for example, a comparator or a microcomputer. When the output voltage of the lighting determination unit 44 is switched from a high level to a low level, the lamp voltage V2 detected by the lamp voltage detection unit 42 and a predetermined determination threshold value are set. Start comparison with. The determination threshold is set to about 90 V corresponding to the rated lamp voltage of the high pressure discharge lamp 100, for example. Then, when the lamp voltage V <b> 2 exceeds the determination threshold, the variable determination unit 48 outputs a control signal that instructs the start of the operation of the input voltage variable unit 46 to the input voltage variable unit 46. That is, in this embodiment, as shown in FIG. 8, the output voltage of the lighting determination unit 44 is switched from a high level to a low level, that is, the input voltage variable unit 46 operates immediately after the high-pressure discharge lamp 100 starts. Instead, the operation starts after the lamp voltage V2 reaches the determination threshold.

  Here, there are individual differences in the time from when the high-pressure discharge lamp 100 is started until the rated lamp voltage is reached. In particular, when the individual difference is large, when the control unit 4 performs setting control and variable control after a certain time T1 has elapsed after starting of the high pressure discharge lamp 100 as in the second embodiment, the high pressure discharge lamp 100 is rated. Control may start before the lamp voltage is reached. In this case, there is a possibility that the input voltage V1 decreases while the high-pressure discharge lamp 100 has not shifted to a stable lighting state, and the high-pressure discharge lamp 100 may be extinguished due to an increase in re-ignition voltage when the polarity of the lamp voltage V2 is reversed. is there.

  Therefore, in the present embodiment, as described above, the setting control and variable control are performed in the control unit 4 after the lamp voltage V2 has increased to about the rated lamp voltage. For this reason, it is possible to prevent the high-pressure discharge lamp 100 from falling off regardless of the individual difference in time from when the high-pressure discharge lamp 100 is started until the rated lamp voltage is reached.

  Incidentally, in each of the above embodiments, as shown in FIG. 2A, the input voltage V1 is increased linearly with respect to the lamp voltage V2 in the variable control of the control unit 4, but for example as shown in FIG. In addition, the input voltage V1 may be increased stepwise with respect to the ramp voltage V2. Even in this case, the same effects as those of the above embodiments can be obtained.

  Hereinafter, embodiments of a lighting apparatus according to the present invention will be described with reference to the drawings. Each of the lighting fixtures shown in FIGS. 10A to 10C includes the lighting device A1 according to any of the first to third embodiments, the fixture main body 200 in which a lamp socket (not shown) is housed, and the lighting device. A power cable 201 for connecting A1 and the lamp socket is provided in common. Then, lighting power is supplied from the lighting device A1 to the high-pressure discharge lamp (not shown) attached to the lamp socket via the power cable 201.

  These lighting fixtures can achieve the same effects as any of the first to third embodiments by using any lighting device A1 of the first to third embodiments. The lighting fixture shown in FIG. 10A is a downlight, and the lighting fixtures shown in FIGS. 10B and 10C are lighting fixtures that are movably attached to the wiring duct rail 202.

2 1st converter part 3 2nd converter part 4 Control part 42 Lamp voltage detection part 45 Power supply voltage detection part 100 High pressure discharge lamp AC1 AC power supply (input power supply)

Claims (6)

  A first converter unit that converts a voltage from an input power source into a predetermined DC voltage and outputs the voltage, and an output voltage of the first converter unit is converted into a voltage necessary for lighting the high-pressure discharge lamp, and the high-pressure discharge lamp A second converter unit that supplies power, and a control unit that controls the first converter unit and the second converter unit, wherein the control unit detects an output voltage of the input power source. And a lamp voltage detector that detects a lamp voltage applied to the high-pressure discharge lamp, and the first converter after starting the high-pressure discharge lamp based on the power supply voltage detected by the power supply voltage detector Setting control for setting the output voltage of the unit, and variable control for changing the output voltage of the first converter unit set by the setting control based on the lamp voltage detected by the lamp voltage detection unit Lighting device according to claim Ukoto.   2. The lighting device according to claim 1, wherein the control unit performs the setting control and the variable control after a predetermined time has elapsed after starting the high-pressure discharge lamp.   3. The lighting device according to claim 2, wherein the predetermined time is a time required for the lamp voltage of the high-pressure discharge lamp to rise to a rated lamp voltage.   The said control part controls the output voltage of the said 1st converter part at the time of the said variable control so that it may become substantially twice the lamp voltage of the said high pressure discharge lamp, The one of Claim 1 thru | or 3 characterized by the above-mentioned. The lighting device according to item 1.   The control unit controls an output voltage of the first converter unit during the variable control so that an input power factor of the first converter unit becomes a sufficiently high power factor. The lighting device described.   An illumination fixture comprising: the lighting device according to any one of claims 1 to 5; and a fixture main body that holds the lighting device and the light source.

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