JP2011204625A - Light emitting element lighting device and lamp using the same, and luminaire - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a light emitting element lighting device for regenerating a light emitting element involved in short fault to emit light.SOLUTION: The lighting device 1 for lighting the light emitting element 2 includes a voltage detecting section 5 for detecting voltage applied to the light emitting element 2, and a constant current output section 6 for outputting a current to the light emitting element 2. When a voltage value detected by the voltage detecting section 5 is smaller than a predetermined value, the constant current output section 6 determines that the light emitting element 2 is involved in short fault and controls a current in a regeneration mode including a step of setting a value for the current to be output by the constant current output section 6 to be greater than a rated value. Thus, a shorted part of the light emitting element 2 is burnt off and opened to regenerate the light emitting element 2. The regenerated light emitting element 2 emits light with a current flowing in other part than the burnt-off part.

Description

  The present invention relates to a light emitting element lighting device for lighting a light emitting element, and a lamp and a lighting fixture using the same.

  A driving device that drives a plurality of lamps to emit light is known (see, for example, Patent Document 1). This lamp has a plurality of light emitting elements such as organic EL (electroluminescence) elements. This drive device includes a plurality of current control circuits corresponding to the respective lamps, and the light emitting elements are electrically connected in parallel within the lamp, so that the degree of freedom of connection of the light emitting elements is high. However, if even one light emitting element is short-circuited, the drive device cannot supply current to the other light emitting elements in the lamp, and the lamp cannot emit light.

  Further, a driving device that can cause the lamp to emit light even when the light emitting elements are electrically connected in series and the light emitting element is short-circuited is conceivable. In this driving apparatus, when the light emitting element is short-circuited, the luminous flux is reduced by the amount of the failed element, so that the total luminous flux of the lamp is reduced.

JP 2006-324208 A

  The present invention has been made to solve the above problems, and provides a light-emitting element lighting device that can regenerate a light-emitting element having a short-circuit failure to emit light, and a lamp and a lighting fixture using the same. Objective.

  A light-emitting element lighting device of the present invention is a light-emitting element lighting device that lights a light-emitting element, and includes a voltage detection unit that detects a voltage applied to the light-emitting element, and a constant current output unit that outputs a current to the light-emitting element. The regeneration mode includes a step of making the current value output from the constant current output unit larger than the rated value when the voltage value detected by the voltage detection unit becomes smaller than a predetermined value. It is characterized by adjusting the current.

  In the light-emitting element lighting device, the constant current output unit supplies the current in a regeneration mode including a step of making the current value output from the constant current output unit smaller than the rated value in addition to the step of making the current value output from the rated value larger than the rated value. It is preferable to adjust.

  In this light emitting element lighting device, it is preferable that the constant current output unit adjusts the current so that an average value of current values output from the constant current output unit in the regeneration mode does not exceed a rated value.

  In the light-emitting element lighting device, the constant current output unit is configured to output the constant current output unit when the value detected by the voltage detection unit is smaller than a predetermined value after the regeneration mode is performed for a certain period. It is preferable to adjust the current in a pause mode in which the current value output from the power supply is smaller than the rated value.

  In the light emitting element lighting device, the constant current output unit may adjust the current by repeating the reproduction mode and the pause mode while the value detected by the voltage detection unit is smaller than a predetermined value. preferable.

  In this light emitting element lighting device, the predetermined value of the light emitting element voltage preferably has hysteresis.

  The lamp of the present invention includes a light emitting element and the light emitting element lighting device.

  The lighting fixture of this invention was equipped with the power supply unit and the said lamp.

  According to the present invention, if the voltage value applied to the light emitting element becomes smaller than a predetermined value, it is assumed that the light emitting element is short-circuited and a current larger than the rated value is passed through the light emitting element. The light-emitting element can be regenerated by burning out the short-circuited part of the element and opening the part. As a result, the regenerated light emitting element emits light when a current flows through a portion other than the burned out portion.

The electric circuit diagram of the light emitting element lighting device which concerns on one Embodiment of this invention. (A) is an output waveform diagram of the second pin of the microcomputer in the constant current output portion of the lighting device, (b) is an input waveform diagram of the negative terminal of the comparator OP2 in the identification current output portion, and (c) is the comparator. Input waveform diagram of the positive terminal of OP2, (d) is an output waveform diagram of the comparator OP2. (A) is an output waveform diagram of the voltage detection unit of the lighting device, (b) is a diagram showing a short-circuit failure state of a light emitting element electrically connected to the lighting device, and (c) flows through the light emitting element. The figure which shows an electric current value. (A) is an output waveform diagram of the voltage detection unit of the modified example of the lighting device, (b) is a diagram showing a short-circuit failure state of a light emitting element electrically connected to the modified example, and (c) is the same light emission. The figure which shows the electric current value which flows into an element. The perspective view of the lighting fixture using the lighting device. The block diagram of the lighting fixture. The block diagram of the other aspect which concerns on the same lighting fixture. The electric circuit diagram of the power supply unit of the lighting fixture.

  A light-emitting element lighting device according to an embodiment of the present invention will be described with reference to FIGS. As shown in FIG. 1, a light-emitting element lighting device (hereinafter referred to as a lighting device) 1 supplies light to a light-emitting element 2 made of an organic EL element to light it. The lighting device 1 includes a control power supply circuit 4 that generates a control DC power supply based on supplied power, a voltage detection unit 5 that detects a voltage supplied to the light emitting element 2, and a power supply from the control power supply circuit 4. A constant current output unit 6 that controls the current supplied to the light emitting element 2 is provided. The light emitting element 2 is not composed of an organic EL element, but may be composed of a light emitting diode element (LED element) or the like.

  The constant current output unit 6 is supplied to the light emitting element 2, the step-down chopper circuit 7, the control circuit 8, the current command circuit 9 that issues a command signal for controlling the current supplied to the light emitting element 2 to the control circuit 8. And a current detection unit 10 for detecting current.

  The constant current output unit 6 adjusts the current flowing through the light emitting element 2 in a reproduction mode prepared for reproducing the light emitting element 2 when the light emitting element 2 is considered to be short-circuited. The light emitting element 2 is regenerated. Specifically, the constant current output unit 6 adjusts the current in the reproduction mode when the value detected by the voltage detection unit 5 becomes smaller than a predetermined value (hereinafter referred to as a reproduction start value). In this regeneration mode, the step of making the current value output from the constant current output unit 6 larger than the rated value (hereinafter referred to as the first step), and the current value output from the constant current output unit 6 are made smaller than the rated value. Step (hereinafter referred to as a second step). Note that the playback mode may consist of only the first step.

  The control power supply circuit 4 is a circuit to which power is supplied from a power supply unit to be described later, and includes resistors R1 and R2 for voltage division and a Zener diode ZD1 for generating a constant voltage, and supplies the voltage Vcc to the control circuit 8 and the like. is there. The Zener diode ZD1 has a Zener voltage characteristic of Vcc, and is reversely connected between the connection point of the resistors R1 and R2 and the ground, and the constant power supply voltage Vcc is taken out from the connection point of the resistors R1 and R2.

  The voltage detection unit 5 includes lighting voltage detection resistors R4 and R5 connected in series between the lighting voltage and the ground. The divided voltage of the lighting voltage at the connection point of the resistors R4 and R5 is transmitted to the current command circuit 9, and the lighting voltage is detected from the divided voltage. The current detection unit 10 includes a current detection resistor R3 connected in series between the output side of the light emitting element 2 and the ground. The voltage across the current detection resistor R3 is proportional to the current flowing through the light emitting element 2, and is transmitted to the control circuit 8 as a current detection voltage.

  The step-down chopper circuit 7 includes an electrolytic capacitor C1, a switching element Q1 made of an FET or the like, and a drive circuit 7a that drives the switching element Q1. The step-down chopper circuit 7 includes a regenerative diode D1 for flowing a regenerative current generated when the switching element Q1 is turned off, and an inductor L1 and a capacitor C2 for filtering the output waveform voltage of the switching element Q1. An inductor L1 is connected in series to the output side of the switching element Q1, the output side of the inductor L1 is grounded by a capacitor C2, and the voltage across the capacitor C2 is applied to the light emitting element 2 as a lighting voltage.

  A DC voltage is applied to the electrolytic capacitor C1 of the step-down chopper circuit 7. This DC voltage is a voltage necessary to keep the light-emitting element 2 lit, and is kept constant at, for example, 24 V in the step-down chopper circuit 7. When one or two light emitting elements 2 that require a driving voltage of 5V to 10V are connected in series, the DC voltage required from the step-down chopper circuit 7 to the light emitting element 2 is about 5 to 20V. Moreover, the electrolytic capacitor C1 may be comprised with a battery.

  The step-down chopper circuit 7 converts the DC voltage stored in the electrolytic capacitor C1 into a voltage necessary for lighting the light emitting element 2 by switching the switching element Q1 at a high frequency by the driving circuit 7a. The drive circuit 7a performs switching drive of the switching element Q1 based on the drive control signal from the control circuit 8.

  The control circuit 8 is a circuit that receives signals from the current command circuit 9 and the current detection unit 10 and outputs a drive control signal to the drive circuit 7a, and controls the on / off operation of the switching element Q1 of the step-down chopper circuit 7. Thus, desired power is supplied to the light emitting element 2. Specifically, the control circuit 8 compares an output voltage of the error amplifier OP1 with a triangular wave signal by an error amplifier OP1 that outputs an error signal due to a voltage difference between two input terminals, and a drive control signal to the drive circuit 7a. And a comparator OP2. The error amplifier OP1 and the comparator OP2 are each composed of an operational amplifier, and these circuits are supplied with power from the power supply voltage Vcc. Further, the error amplifier OP1 and the comparator OP2 can be configured at low cost with an IC or the like in which two operational amplifiers are built in one package.

  In the error amplifier OP1, the current detection voltage from the current detection resistor R3 is applied to the negative input terminal via the resistor R6 and the input resistor R10. A connection point between the resistor R6 and the input resistor R10 is grounded by a filter capacitor C3. The output terminal of the error amplifier OP1 and the negative input terminal are connected by a gain adjusting resistor R11.

  The error amplifier OP1 has a positive input terminal connected to a resistor R12 connected to the connection point of the resistors R7, R8 of the resistors R7, R8, R9 connected in series between the power supply voltage Vcc and the ground. The A connection point between the resistor R12 and the plus input terminal of the error amplifier OP1 is grounded by the resistor R13. The switching element Q2 (FET) has a drain connected to the connection point of the resistors R8 and R9, a gate connected to the fourth pin of the IC1, and a source grounded. The switching element Q3 (FET) has a drain connected to the connection point of the resistors R7 and R8, a gate connected to the third pin of the IC1, and a source grounded. The error amplifier OP1 amplifies an error signal of a difference between the reference voltage Ve input to the plus input terminal and the current detection voltage from the current detection resistor R3, and uses this as a reference voltage Vr of the comparator OP2 for the comparator OP2. Output to the positive input terminal.

  Comparator OP2 has its negative input terminal connected to the drain of switching element Q4 (FET) whose source is grounded. The drain of the switching element Q4 is connected to a connection point between a resistor R14 and a capacitor C4 connected in series between the power supply voltage Vcc and the ground, and the gate terminal of the switching element Q4 is connected to the second pin of IC1. .

  The switching element Q4 is turned on when a “high” pulse signal Vp is applied from IC1 to the gate, the drain and source are short-circuited, the capacitor C4 is also short-circuited, and the voltage of the capacitor C4 becomes low level. When the “low” pulse signal Vp is applied to the gate terminal, the switching element Q4 is turned off, and the capacitor C4 is charged from the power supply voltage Vcc to the capacitor C4 via the resistor R14. By the on / off operation of the switching element Q4, the voltage across the capacitor C4 becomes a triangular waveform and a triangular waveform signal Vq is formed. The comparator OP2 compares the triangular wave signal Vq at the minus terminal with the reference voltage Vr at the plus terminal, and outputs an output signal Vs to the drive circuit 7a.

  The current command circuit 9 determines a light emitting element peak current value command value and a light emitting element current duty, and is constituted by a general-purpose microcomputer IC1 (A / D conversion function / 8-bit microcomputer with flash memory). The current command circuit 9 detects the lighting voltage of the light emitting element 2 by monitoring the voltage at the connection point of the resistors R4 and R5. When the lighting voltage becomes smaller than the reproduction start value, the current command circuit 9 regenerates the light emitting element 2. Start playback mode. The current command circuit 9 ends the regeneration mode when the lighting voltage becomes larger than a predetermined value (hereinafter referred to as a regeneration end value) during the regeneration mode. In order to read the voltage value of the light emitting element 2 obtained from the voltage across the capacitor C2, the 7th pin of the IC1 is set as an A / D conversion input. The second, third, and fourth pins of IC1 are set to binary output, the first pin is a power supply terminal to which a power supply voltage is applied, and the eighth pin is a ground terminal that is grounded. In addition, the fifth pin is connected to a dimming signal receiving unit 16 described later, and a dimming signal is input thereto.

  The IC 1 of the current command circuit 9 varies the reference voltage Ve by changing the voltage output from the 3rd pin and the 4th pin according to the current detection voltage from the current detection resistor R3 (constant current control). The drive control signal is fed back by the current detection voltage of the current detection resistor R3.

Next, the setting of the reference voltage Ve will be described. When outputting the light emitting element current value of the rated value from the constant current output unit 6, the output of the third pin of the microcomputer IC1 is set to “low”, and the output of the fourth pin is set to “high”. The control circuit 8 short-circuits the R9 terminal by the output from the microcomputer IC1, and sets the reference voltage Ve input to the plus terminal of the error amplifier OP1 with the resistance ratio of R7 and R8. This reference voltage Ve is expressed by the following equation.
Ve = Vcc × (R7 × R13) / ((R7 + R8) × (R12 + R13))

In the first step of the reproduction mode, the output of the third pin of the microcomputer IC1 is set to “low”, and the output of the fourth pin is set to “low”. The control circuit 8 sets the reference voltage Ve input to the plus terminal of the error amplifier OP1 with the resistance ratio of R7, R8, and R9 by the output from the microcomputer IC1. This reference voltage Ve is expressed by the following equation different from the above equation.
Ve = Vcc × ((R7 + R8) × R13) / ((R7 + R8 + R9) × (R12 + R13))

  In the second step of the reproduction mode, the output of the third pin of the microcomputer IC1 is set to “high”, and the output of the fourth pin is set to “high” or “low”. The control circuit 8 short-circuits the terminals R8 and R9 by the output from the microcomputer IC1, and sets the reference voltage Ve input to the plus terminal of the error amplifier OP1 to 0V. Although it has been shown that the light emitting element current value is controlled by the digital outputs of the switching elements Q2 and Q3 and the microcomputer IC1, a microcomputer with a built-in D / A conversion function can control the light emitting element current value directly by analog output. You can also.

  Here, generation of a drive control signal for driving the switching element Q1 of the control circuit 8 will be described with reference to FIG. FIG. 2A shows a pulse signal Vp having a constant period width which takes a high / low output state outputted from the second pin of IC1, and FIG. 2B shows a capacitor C4 applied to the negative terminal of the comparator OP2. The triangular wave signal Vq of the both-ends voltage is shown. FIG. 2C shows the reference voltage Vr (solid line portion) applied to the plus terminal of the comparator OP2 and the triangular wave signal Vq (dotted line portion) of the capacitor C4 as a comparative example. (D) shows the output signal Vs from the comparator OP2.

  When the pulse signal Vp shown in FIG. 2A is applied to the switching element Q4 and turned on / off, the voltage across the capacitor C4 is changed to a triangular wave signal Vq as shown in FIG. It becomes. As shown in FIG. 2C, the comparator OP2 compares the triangular wave signal Vq with the reference voltage Vr. At this time, as shown in FIG. 2D, when the triangular wave signal Vq is lower than the reference voltage Vr, a “high” pulse signal is output from the comparator OP2 as the output signal Vs. Therefore, by changing the reference voltage Vr, the pulse width of the output signal Vs varies, and the magnitude of the current supplied to the light emitting element 2 can be adjusted.

  In the output signal Vs, the pulse width of the output signal Vs varies depending on the level of the reference voltage Vr, and the reference voltage Vr varies depending on the reference voltage Ve input to OP1. Thus, the output signal Vs is output from OP2 after the pulse width is controlled by the reference voltage Ve, and is input to the drive circuit 7a as a drive control signal.

  The operation of the lighting device 1 when the light emitting element 2 is short-circuited will be described with reference to FIG. 3A shows the lighting voltage of the light emitting element 2 output from the voltage detector 5, FIG. 3B shows the state of whether or not the light emitting element 2 is short-circuited, and FIG. Indicates the value of the current flowing through the light emitting element 2 under the control of the lighting device 1.

  The short circuit failure of the light emitting element 2 is detected when the light emitting element voltage decreases and falls below the regeneration start value (TH1). When the lighting device 1 detects a short circuit failure, the lighting device 1 enters the regeneration mode, and repeats the first step having a current value larger than the rated value and the second step having a current value smaller than the rated value.

  In the light emitting element 2 that is short-circuited, when a current is passed, the current concentrates on a portion of a small area that is short-circuited. When a current having a current value larger than the rated value is supplied in the first step, the short-circuit portion of the light emitting element 2 is burned out and opened, and the current does not flow. As a result, the light emitting element 2 is regenerated as a current flows in a portion other than the burned-out portion and thus is normally lit. When the short circuit failure of the light emitting element 2 is repaired, the light emitting element voltage rises and exceeds the regeneration end value (TH2), thereby terminating the regeneration mode. Since this reproduction end value (TH2) has hysteresis, it is possible to reduce malfunctions and chattering due to fluctuations in light emitting element voltage and noise.

  The average value of the current value output from the constant current output unit 6 in the reproduction mode is set so as not to exceed the rated value. For example, a step of flowing 1.2 times the rating (first step) and a step of 0A ( Step 2) is repeated at the same time. The time of the first step and the second step is from several ms to several tens of seconds, respectively. In the second step, in addition to 0 A, for example, a current having a current value that is half the rated value may flow. In addition, the step of passing a current having a current value twice the rated value (first step) and the step of 0A (second step) may be repeated at a ratio of 1: 1 (ON DUTY 50%). The step of passing a current having a current value four times the value (first step) and the step of 0A (second step) may be repeated at a ratio of 1: 3 (ON DUTY 25%).

  In the lighting device 1 configured as described above, it is assumed that the light emitting element 2 is short-circuited from the voltage value detected by the voltage detection unit 5, and the constant current output unit 6 is more than the rated value. Since a current is passed through the light-emitting element 2 with a large current value, the short-circuited portion of the light-emitting element 2 can be burned out to open that portion, and the light-emitting element 2 can be regenerated. As a result, the regenerated light-emitting element 2 emits light when a current flows through a portion other than the burned-out portion.

  Moreover, the lighting device 1 can reduce the stress applied to the non-shorted portion of the light emitting element 2 by flowing a current having a current value smaller than the rated value in the second step during the reproduction mode. Moreover, since the constant current output unit 6 is set so that the average value of the current values does not exceed the rated value, the stress applied to the non-shorted portion of the light emitting element 2 can be further reduced.

(Modification)
FIG. 4 shows the operation of the lighting device 1 according to a modification of the present embodiment. The lighting device 1 of this modified example has a pause mode having a current value smaller than the rated value after the regeneration mode is performed for a certain period in addition to the regeneration mode. In the pause mode, the magnitude of the current supplied to the light emitting element 2 is adjusted in the same manner as in the second step of the reproduction mode. The regeneration mode and the pause mode are repeatedly performed at the same time until the light emitting element voltage rises and exceeds the regeneration end value (TH2). The time in the reproduction mode and the pause mode is from several seconds to several tens of seconds. Note that the time of the playback mode and the pause mode may be different.

  Since the lighting device 1 configured as described above has a pause mode in which a current having a current value smaller than the rated value is passed, the light emitting element 2 is short-circuited when the time until regeneration is prolonged. It is possible to reduce the stress applied to the parts that are not present. Moreover, since the constant current output unit 6 adjusts the current by repeating the reproduction mode and the pause mode, the stress applied to the non-shorted portion of the light emitting element 2 is further reduced when the time until the reproduction is prolonged. Can be made.

  Configurations of a lamp and a lighting fixture to which the lighting device 1 is applied will be described with reference to FIGS. As shown in FIGS. 5 and 6, the lighting fixture 11 is a ceiling-hanging lighting fixture, and supplies a substantially square lamp 12 having the lighting device 1 and the light emitting element 2, and power to the lamp 12. A power cord 13 that suspends and supports the lamp 12 suspended from the ceiling via the power cord 13.

The hanging tool 14 has a light receiving unit 15 for receiving an infrared signal transmitted from a remote controller (not shown), and has three lines for outputting a DC voltage V ₀ , a dimming signal S, and a ground potential GND. And a power supply unit 3 electrically connected.

The lamp 12 is electrically connected to the three lines of the DC voltage V ₀ , the dimming signal S, and the ground potential GND output from the power supply unit 3, and is electrically connected to the dimming signal S line and the ground potential GND line. A dimming signal receiving unit 16 is connected. In the figure, the lamp 12 includes three lighting devices 1, three light emitting elements 2, and three dimming signal receiving units 16, but the number thereof is arbitrary. In addition, as illustrated in FIG. 7, the lighting fixture 11 may include a plurality of lamps 12.

The lighting device 1 is electrically connected to the DC voltage V ₀ line, the ground potential GND line, and the dimming signal receiver 16, and the light emitting element 2 is electrically connected to the lighting device 1 and the ground potential GND line. . The signal received by the light receiving unit 15 is transmitted to the lighting device 1 through the power supply unit 3, the line of the dimming signal S and the dimming signal receiving unit 16. The lighting device 1 controls the current value of the light emitting element 2 based on the signal output from the dimming signal receiving unit 16 and the voltage value of the light emitting element 2 detected by the voltage detecting unit 5.

  Next, the configuration of the power supply unit 3 will be described in detail. As shown in FIG. 8, the power supply unit 3 includes an input unit 17, an AC / DC unit 18, a control power supply circuit 19, a DC / DC unit 20, a constant voltage control unit 21, an output current detection unit 22, and a dimming signal transmission. A unit 23, a light control unit 24, and an output unit 25. The input unit 17 is configured by an input filter or a surge absorber made up of an inductor or capacitor for noise removal, and the input side is connected to a commercial AC power source and the output side is connected to the AC / DC unit 18.

  The AC / DC unit 18 includes a rectifier diode and a step-up chopper circuit having a power factor improving function, converts 50 Hz or 60 Hz AC from a commercial AC power source into a DC voltage, and applies a DC voltage to the electrolytic capacitor C5. Further, the voltage value of the AC / DC unit 18 is kept constant, for example, several hundred volts, and is set in consideration of the voltage of the commercial AC power supply.

  The control power supply circuit 19 is composed of voltage dividing resistors R15 and R16 and a Zener diode ZD2, and generates a voltage Vcc to be supplied to the control circuit. The DC / DC unit 20 is a step-down chopper circuit, and includes a switching element Q5, a regeneration diode D2, an inductor L2, and a capacitor C6. The DC / DC unit 20 converts the DC voltage stored in the electrolytic capacitor C5 into electric power necessary for the load and outputs it to the output unit 25 when the switching element Q5 switches at a high frequency. The voltage output from the DC / DC unit 20 is kept constant at, for example, 24 V, and the constant voltage control unit 21 turns the switching element Q5 on and off so that the divided voltage of the resistors R17 and R18 is constant. Control. Switching frequency is several tens of kHz to several MHz.

  The output current detector 22 includes a resistor R19 and an amplifier circuit 21a, detects a voltage generated by the current flowing through the resistor R19, and transmits this voltage to the dimming signal transmitter 23 as a voltage amplitude signal. The dimming signal transmission unit 23 includes a combination of general-purpose ICs and a microcomputer, and transmits a dimming signal such as a PWM signal to the output unit based on a command value from the dimming unit 24 or a detection value from the output current detection unit 22. To do. The PWM signal has an amplitude of 12V, and the dimming rate increases as the on-time decreases at 1 kHz. When the PWM signal is output at the rated value, the dimming rate is 100%. The dimming signal may be an amplitude signal.

The light control unit 24 is electrically connected to the light receiving unit 15, converts the light control request transmitted from the light receiving unit 15 into a light control command value using a conversion function corresponding to the light control request, and controls the light control command value. This is transmitted to the signal transmission unit 23. The dimming signal transmission unit 23 converts the dimming command value into a dimming signal and transmits it to the output unit 25. The output unit 25 outputs the DC voltage V ₀ controlled from the DC / DC unit 20, the dimming signal S from the dimming signal transmission unit 23, and the ground potential GND in three lines. According to the luminaire 11 and the lamp 12 having such a configuration, it is possible to detect a short-circuit failure from the voltage value detected by the voltage detection unit 5, enter the regeneration mode, and regenerate the light emitting element 2.

  In addition, this invention is not restricted to the structure of said embodiment, A various deformation | transformation is possible in the range which does not change the summary of invention. For example, the reproduction start value and the reproduction end value are different from each other, but the reproduction start value and the reproduction end value may be different. Further, the current values of the first step and the second step may be gradually increased or gradually decreased.

1 lighting device (light emitting element lighting device)
2 Light Emitting Element 3 Power Supply Unit 5 Voltage Detection Unit 6 Constant Current Output Unit 11 Lighting Fixture 12 Lamp

Claims (8)

In the light emitting element lighting device for lighting the light emitting element,
A voltage detector for detecting a voltage applied to the light emitting element;
A constant current output unit for outputting a current to the light emitting element,
When the voltage value detected by the voltage detection unit becomes smaller than a predetermined value, the constant current output unit is configured in a reproduction mode including a step of making the current value output from the constant current output unit larger than a rated value. A light emitting element lighting device characterized by adjusting a current.   The constant current output unit adjusts the current in a playback mode including a step of making the current value output from the constant current output unit larger than a rated value, and a step of making the current value smaller than the rated value. The light emitting element lighting device according to claim 1.   The said constant current output part adjusts an electric current so that the average value of the current value which the said constant current output part outputs in reproduction | regeneration mode may not exceed a rated value, The Claim 1 or Claim 2 characterized by the above-mentioned. Light emitting element lighting device.   The constant current output unit is configured to rate a current value output from the constant current output unit when a value detected by the voltage detection unit is smaller than a predetermined value after the regeneration mode is performed for a certain period. The light emitting element lighting device according to any one of claims 1 to 3, wherein the current is adjusted in a pause mode in which the current is smaller than the value.   The constant current output unit adjusts the current by repeating the reproduction mode and the pause mode while the value detected by the voltage detection unit is smaller than a predetermined value. The light emitting element lighting device of description.   The light emitting element lighting device according to any one of claims 1 to 5, wherein the predetermined value of the light emitting element voltage has a hysteresis.   A lamp, comprising: a light emitting element; and the light emitting element lighting device according to any one of claims 1 to 6.   A lighting fixture comprising a power supply unit and the lamp according to claim 7.

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