JP2014137865A - Lighting device for solid light-emitting element, illuminating fixture, and illumination system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lighting device for a solid light-emitting element capable of appropriately suppressing an undesired optical output at instantaneous stop and instantaneous drop of voltage.SOLUTION: A lighting device comprises: a lighting circuit 20 receiving power and a control signal, and supplying current of an amount corresponding on the control signal to a solid light-emitting element 70 by using the power; a power supply detection circuit 40 detecting power reception start and power reception stop of the power; and a control circuit 55 supplying the control signal to the lighting circuit 20 to perform dimming of the solid light-emitting element 70 to an objective dimming level following the change in a dimming level indicated by the dimming signal. At a normal lighting, the control circuit 55 performs dimming of the solid light-emitting element 70 to the objective dimming level following the change in the dimming level at a predetermined response speed. For a predetermined time period after at least one of the power reception start and the power reception stop of the power is detected, the control circuit 55 performs dimming of the solid light-emitting element 70 to the objective dimming level following the change in the dimming level at a response speed lower than the response speed at the normal lighting.

Description

  The present invention relates to a lighting device for lighting solid light emitting elements such as light emitting diodes and organic EL elements, and a lighting fixture and lighting system using the same, and in particular, lighting for lighting solid light emitting elements with brightness according to a dimming signal. Relates to the device.

  In recent years, lighting fixtures using solid light emitting elements such as light emitting diodes (LEDs) or organic EL elements have become widespread as lighting fixtures with low power consumption and long life.

  When used in combination with a dimming signal generator (equipment for instructing the dimming level), a lighting device that dims and lights a solid-state light-emitting element according to an instruction from the dimming signal generator is put into practical use. Has been.

  In such a lighting device, generally, the amount of current that flows through the solid state light emitting element is determined according to the dimming level indicated by the dimming signal from the dimming signal generator, and the determined amount of current is switched. Dimming operation is performed by flowing from a circuit (step-down chopper circuit, flyback circuit, etc.) to the solid state light emitting device.

  As shown in FIG. 9, a general lighting device 80 includes an input filter 12, a rectifier circuit 13, a lighting circuit 20, and a control circuit 50. The lighting circuit 20 includes a step-up chopper circuit 21 and a step-down chopper circuit 22. The lighting device 80 receives the power and the dimming signal from the AC power source 11 and the dimming signal generation device 60, respectively, and controls the lighting circuit 20 from the control circuit 50, so that the solid-state light emitting device 70 is supplied with the received power. Dimming to the dimming level indicated by the dimming signal.

  The dimming signal supplied from the dimming signal generation device 60 is, for example, a PWM signal having a frequency of 1 kHz, and the dimming state with respect to the light emission amount in all the lights to be dimmed (full lighting) state according to the ON duty. Represents a dimming level (also referred to as a dimming ratio), which is a ratio of the amount of emitted light.

  FIG. 10 is a graph showing an example of the dimming level represented by the ON duty of the dimming signal. The lighting device 80 controls the amount of current that flows through the solid state light emitting element 70 according to the ON duty of the dimming signal so that the solid state light emitting element 70 emits light at the dimming level represented by the curve of FIG. .

JP 2009-232625 A

  As shown in FIG. 11, when the power is turned on, the dimming signal generator 60 outputs a dimming signal indicating the entire lighting state (100% dimming level) as the initial dimming signal for a predetermined period. A dimming signal indicating a desired dimming level is output. The dimming signal generator 60 continues to output the dimming signal for a predetermined period of time using the power stored in the dimming signal generator 60 even after the power is turned off. Stop output (disruption due to power loss).

  Therefore, the light output of the lighting device 80 used in combination with the dimming signal generator 60 can be changed as follows.

  As shown in FIG. 12, when the power is first turned on, the light output changes in the order of 100% (initial dimming signal) and a desired dimming level. Also, at the momentary power failure / falling (loss or decrease of power supply voltage for a short time of several milliseconds to several seconds indicated by power OFF and subsequent power ON), the light output is a desired dimming level, It changes in order of 100% and the desired dimming level. The dimming level of 100% generated at the momentary power interruption / falling is a false dimming level generated when the dimming signal is interrupted (that is, the ON duty of the dimming signal becomes 0%).

  As shown in FIG. 13, when the lighting device 80 and the dimming signal generation device 60 receive power from the same power source, the light output is a desired dimming level, 100%, extinguished, 100 % And can be changed in the order of the desired dimming level. In the operation of FIG. 13, not only the dimming signal generator 60 stops outputting the dimming signal due to the loss of power, but also the lighting device 80 cannot supply current to the solid light emitting element 70 and the solid light emitting element 70 is turned off. It happens when you do.

  Thus, since the lighting device 80 performs dimming according to the dimming signal, the solid-state light emitting element 70 can generate an undesired light output at 100%.

  As a countermeasure against an undesired light output, a method of canceling the dimming signal for a predetermined period after the power is turned on to reduce or turn off the light, and turning on the light according to the dimming signal after the predetermined period ( For example, there is Patent Document 1). The method of Patent Document 1 is effective as a countermeasure against an undesired light output when the power is turned on. However, if the dimming signal is interrupted during a momentary power failure / falling, the solid-state light emitting element 70 has an undesired 100%. It is impossible to avoid the disadvantage that the light output is generated at.

  Then, an object of this invention is to provide the lighting device for solid light emitting elements which can suppress appropriately the light output which is not desired at the time of a sag / fall.

  In order to achieve the above object, a lighting device according to an aspect of the present invention receives a power and a control signal, and supplies a solid light emitting element with an amount of current corresponding to the control signal from the power, The solid-state light emitting device is controlled by receiving a detection circuit for detecting start and stop of power reception and a dimming signal indicating a dimming level of the solid-state light emitting device, and supplying the control signal to the lighting circuit. A control circuit for dimming to a target dimming level that follows a change in the dimming level indicated by the optical signal, and the control circuit controls the solid state light emitting element at a predetermined response speed during steady lighting. Dimming to a target dimming level that follows a change in the light level, and at least one of power reception start and power reception stop is detected for a predetermined period of time, the solid state light emitting element is in the steady lighting state Response speed on the purpose dimming level dimming to follow the change of the dimming level slower than the response speed.

  Here, the control circuit controls the solid-state light emitting element at the dimming level at different response speeds in a first period after detection of power reception start and in a second period after detection of power reception stop. Dimming may be performed to a target dimming level that follows the change.

  The control circuit may dim the solid-state light emitting element to a target dimming level that starts from a predetermined dimming level and follows a change in the dimming level after detecting the start of power reception. .

  In addition, the control circuit, when the dimming level indicated by the dimming signal is equal to or higher than a predetermined dimming level in the second period after the power reception stoppage is detected, Dimming to a target dimming level that follows the change in the dimming level at a response speed slower than the response speed during steady lighting, and the dimming level indicated by the dimming signal is less than the predetermined dimming level In this case, the solid-state light emitting element may be dimmed to a target dimming level that follows the change in the dimming level at the response speed during steady lighting.

  In addition, this invention can be implement | achieved not only as a lighting device but as a lighting fixture provided with the said lighting device, and a lighting system.

  According to the lighting device of the present invention, the start of power reception and power stop are detected, and the response speed of the target dimming level is determined for a predetermined period after at least one of the power reception start and power stop is detected. In this case, the voltage is lower than that during steady lighting. As a result, when the dimming signal is interrupted due to loss of power, such as during a momentary power failure / falling, for example, the light output does not immediately reach 100%, so that the undesired light output is reduced. Moreover, the response speed of the target dimming level during steady lighting can be maintained at a high speed (for example, the fastest possible speed). As a result, it is possible to obtain a lighting device that can reduce an undesired light output generated when the power is turned on and off, and that does not impair the operational feeling during steady lighting.

The circuit diagram which shows an example of the lighting device in Embodiment 1 of this invention The figure which shows an example of the tracking pattern to the light control level of the target light control level The figure which shows an example of the predetermined period after power-on detection and power-off detection Timing chart showing an example of operation of the lighting device according to Embodiment 1 Timing chart showing an example of operation of the lighting device according to Embodiment 1 Timing chart showing an example of operation of the lighting device according to Embodiment 1 Timing chart showing an example of operation of the lighting device according to Embodiment 1 Timing chart showing an example of operation of the lighting device according to Embodiment 1 Circuit diagram showing an example of a general lighting device The graph which shows an example of the light control level shown with the light control signal Timing chart showing an example of operation of a general lighting device Timing chart showing an example of operation of a general lighting device Timing chart showing an example of operation of a general lighting device

  Hereinafter, a lighting device and a lighting fixture according to the present invention will be specifically described with reference to the drawings. Note that each of the embodiments and modifications described below is a specific example of the present invention. The numerical values, shapes, materials, constituent elements, arrangement positions and connection forms of the constituent elements, operation timings, and the like shown in the following embodiments and modifications are merely examples, and are not intended to limit the present invention. In addition, among the constituent elements in the following embodiments and modifications, constituent elements that are not described in the independent claims indicating the highest concept are described as optional constituent elements.

(Embodiment)
The lighting device according to the embodiment is a lighting device that dims a solid-state light emitting element to a target dimming level that follows a change in the dimming level of the solid-state light emitting element indicated by a dimming signal. Configured as follows.

  The lighting device 85 is a device for dimming the solid state light emitting element 70 to a dimming level indicated by the dimming signal supplied from the dimming signal generation device 60, and includes the input filter 12, the rectifier circuit 13, and the power supply detection circuit 40. , The lighting circuit 20, and the control circuit 55.

  The lighting circuit 20 includes, for example, a step-up chopper circuit 21 (including Q1, T1, D1, R1, and C1) and a step-down chopper circuit 22 (including Q2, T2, D2, R2, and C2). The step-down chopper circuit 22 controls the amount of current supplied to the solid state light emitting device 70.

  The control circuit 55 includes, for example, a boost control circuit 51, a dimming signal conversion circuit 52, a step-down control circuit 54, and a microcomputer 56 (including response speed adjustment logic 57).

  The lighting device 85 may be driven by the AC power supply 11, and the DC power supply 10 may be used instead of the AC power supply 11, the input filter 12, and the rectifier circuit 13. When the power supply voltage is sufficiently high, the boost chopper circuit 21 may be omitted. Further, the amount of current supplied to the solid state light emitting device 70 may be controlled by using a step-up / step-down chopper circuit, a step-up chopper circuit, or a flyback circuit instead of the step-down chopper circuit 22.

  The step-up chopper circuit 21 and the step-up control circuit 51 operate as follows.

  In the transformer (T1), a detection signal for turning on the MOS-FET (Q1) is generated, and a current flowing during a period in which the MOS-FET (Q1) is turned on is detected by the resistor R1, and the MOS-FET ( A detection signal for turning off Q1) is generated. The boost control circuit 51 compares each detection signal with a reference voltage to determine the timing for turning on / off the MOS-FET (Q1). The gate signal of the MOS-FET (Q1) is generated at the determined timing, and the MOS-FET (Q1) is turned on / off by the gate signal. As a result, the output voltage of the boost chopper circuit 21 is adjusted to a predetermined value.

  The step-down chopper circuit 22 and the step-down control circuit 54 operate as follows.

  In the transformer (T2), a detection signal for turning on the MOS-FET (Q2) is generated, and a current flowing during a period in which the MOS-FET (Q2) is turned on is detected by the resistor R2, and the MOS-FET ( A detection signal for turning off Q2) is generated. The step-down control circuit 54 compares each detection signal with a reference voltage, and determines the timing for turning on / off the MOS-FET (Q2). The gate signal of the MOS-FET (Q2) is generated at the determined timing, and the MOS-FET (Q2) is turned on / off by the gate signal. Thereby, the current supplied to the solid state light emitting device 70 is adjusted to a predetermined amount. Here, the gate signal of the MOS-FET (Q2) is an example of a control signal received by the lighting circuit 20.

  The dimming signal supplied from the dimming signal generator 60 is a PWM signal that indicates the dimming level of the solid state light emitting device 70 by ON duty. The dimming signal conversion circuit 52 converts the dimming signal into a voltage signal. The voltage signal represents a dimming level indicated by an ON duty of the dimming signal as a voltage level. The voltage signal converted by the dimming signal conversion circuit 52 is applied to an A / D conversion port of a microcomputer 56 (for example, R8C / 28, 29 group of Renesas Electronics Corp.).

  The start of power reception and the stop of power reception (hereinafter simply referred to as power ON and power OFF) in the lighting device 85 are detected as follows.

  The power supply detection circuit 40 generates a logic signal representing the comparison result by comparing the output voltage of the rectifier circuit 13 with a predetermined value, and inputs it to the general-purpose port of the microcomputer 56. Alternatively, the detection voltage is generated by smoothing the output voltage of the rectifier circuit 13 by the power supply detection circuit 40 and input to the A / D conversion port of the microcomputer 56. The microcomputer 56 processes the logic signal or the detection voltage to detect power ON and power OFF.

  The microcomputer 56 generates a step-down chopper control signal. The step-down chopper control signal represents a target dimming level that follows a change in the dimming level indicated by the dimming signal. The step-down chopper control signal may be a delay voltage signal obtained by delaying the voltage signal converted by the dimming signal conversion circuit 52 at a response speed determined by the response speed adjustment logic 57.

  The response speed adjustment logic 57 generates the step-down chopper control signal by delaying the voltage signal at a predetermined response speed during steady lighting. The response speed adjustment logic 57 delays the voltage signal at a response speed slower than the response speed at the time of steady lighting for a predetermined period after at least one of power ON and power OFF is detected, thereby controlling the step-down chopper. Generate a signal.

  The step-down control circuit 54 controls the step-down chopper circuit 22 using the delayed voltage signal, which is a step-down chopper control signal, as the reference voltage described in the operation of the step-down control circuit 54. Thereby, the solid state light emitting device 70 is dimmed to a target dimming level that follows the dimming level indicated by the dimming signal.

  The response speed and the predetermined period are set by the response speed adjustment logic 57 as follows, for example.

  As shown in FIG. 2, the response speed adjustment logic 57 holds, for example, three types of tracking patterns for causing the target dimming level to follow the dimming level indicated by the dimming signal. These follow-up patterns are held in the microcomputer 56 in the form of a table, for example, and are selectively used.

  Consider a case where the ON duty of the dimming signal is changed from 80% to 25% in order to change the dimming level by half the total range (for example, from 2% to 50%). In this case, the target dimming level follows the change in the dimming level with a tracking pattern selected from the tracking patterns shown in FIG. 2, and the response time t1, t3 or t2 (t1 <t3 <t2) has elapsed. Later, the dimming level indicated by the dimming signal after the change reaches 50%.

  Thus, the response time in which the target dimming level follows a change in half the entire range of the dimming level can be used as a measure of the response speed. For example, the response speeds S1, S3, and S2 of each pattern in FIG. 2 may be defined by reciprocal response times 1 / t1, 1 / t3, and 1 / t2. In this case, the response speeds S1, S3, and S2 of each pattern in FIG. 2 satisfy the relationship of S1> S3> S2 (the smaller the value, the slower).

  In the example of FIG. 2, the target dimming level changes exponentially (accelerated), but the target dimming level may change linearly (at a constant speed). It may change along the curve, and a desired change may be made. When the target dimming level is changed along the dimming curve in FIG. 10, the change in the light output when the user operates the dimming knob at a constant speed can be simulated.

  The microcomputer 56 switches the follow-up pattern described above by executing a program stored in advance, when the power supply is detected, when the power supply is detected, and when a predetermined period after the power supply ON / OFF is detected. As a result, during steady lighting, one of the response speeds S1, S2, and S3 is selected in each of the three types of periods, that is, the first period after detection of power ON and the second period after detection of power OFF.

  FIGS. 3A to 3C show some setting examples in the first period after the power-on detection and the second period after the power-off detection at the time of the instantaneous drop / fall. Here, the specified length t2 of the first period after the detection of power ON is set to t2, and the specified length of the second period after the detection of power OFF is set to t3. The response times t2 and t3 described above may be used for the specified lengths t2 and t3.

  (A) If power ON is detected in the middle of the second period after power OFF detection, the second period ends at that time. The second period is shorter than the specified length t3. A first period of the specified length t2 is provided after the power ON is detected.

  (B) After detection of power OFF and after detection of power ON, a second period of a specified length t3 and a first period of a specified length t2 are provided, respectively.

  (C) Even if the power ON is detected in the middle of the second period after the power OFF is detected, the second period is continued to the specified length t3. The start of the first period after detecting the power ON is postponed until the end of the second period. The first period is shortened from the specified length t2 by the time when the second period has elapsed after detection of power ON.

  The start point, end point, and specified length t2 of the first period, and the start point, end point, and specified length t3 of the second period are examples. These may be set so that an undesired light output can be reduced in accordance with the characteristics of the dimming signal output from the dimming signal generator 60 when power is lost, such as during a sag or dips.

  Subsequently, some operation examples executed by the lighting device 85 configured as described above will be described.

(Operation example 1)
As shown in FIG. 4, for example, the response speed S1 is selected at the time of steady lighting, the response speed S2 is selected in the first period after the power ON is detected, and the response speed S2 is selected in the second period after the power OFF is detected. The response speed S2 is slower than the response speed S1, that is, S1> S2. The first period and the second period are shown according to FIG.

  According to such an operation, the lighting device 85 detects the power OFF and the power ON, and the response speed of the target dimming level is lower than the steady lighting in the predetermined period after the power OFF detection and the power ON detection. Let As a result, when the dimming signal is interrupted due to loss of power, such as during a momentary power failure / falling, for example, the light output does not immediately reach 100%, so that the undesired light output is reduced. Moreover, the response speed of the target dimming level during steady lighting can be maintained at a high speed (for example, the fastest possible speed). As a result, it is possible to obtain a lighting device that can reduce an undesired light output generated when the power is turned on and off, and that does not impair the operational feeling during steady lighting.

  Note that the response speed of the target dimming level may be reduced only in one of the first period after detection of power ON and the second period after detection of power OFF, and the characteristics of the dimming signal when power is lost Accordingly, it is possible to appropriately modify the optical output so that an undesired light output is reduced.

(Operation example 2)
As shown in FIG. 5, for example, the response speed S1 is selected during steady lighting, the response speed S2 is selected in the first period after the power ON is detected, and the response speed S3 is selected in the second period after the power OFF is detected. The response speeds S2 and S3 are both slower than the response speed S1, that is, S1> S2 and S1> S3. The first period and the second period are shown according to FIG.

  According to such an operation, an effect equivalent to that of the operation example 1 can be obtained. Furthermore, since the target dimming level is made to follow the dimming level at different response speeds S2 and S3 in the first period and the second period, the degree of freedom in control is improved. As a result, it is possible to control to reduce an undesired light output in accordance with the characteristics of the respective dimming signals at the time of power loss and power recovery.

  The response speed S2 in the first period may be faster or slower than the response speed S3 in the second period, and an undesired light output depending on the characteristics of the respective dimming signals at the time of power loss and power recovery. It can be modified as appropriate so as to reduce.

(Operation example 3)
In the above-described operation examples 1 and 2, after the first power-on detection, the target dimming level starts from the 100% dimming level indicated by the dimming signal. This operation is assumed to be performed in a situation in which the memory of the last target dimming level is lost in the microcomputer 56 due to, for example, power-off for a long time. In this operation, as shown in FIGS. 4 and 5, the undesired light output generated after the first power-on is not reduced.

  Therefore, in the operation example 3, the target dimming level is started from a predetermined value (initial value) when the power supply is detected, and is made to follow the change of the dimming level indicated by the dimming signal. The initial value may be, for example, 2%, which is the lower limit of the dimming level. Thus, a fade-in operation is performed in which the light output gradually increases from the lower limit of the dimming level when the power is turned on.

  As shown in FIG. 6, for example, the response speed S1 is selected at the time of steady lighting, the response speed S2 is selected in the first period after the power ON is detected, and the response speed S3 is selected in the second period after the power OFF is detected. The response speeds S2 and S3 are both slower than the response speed S1, that is, S1> S2 and S1> S3. The first period and the second period are shown according to FIG. When the power is turned on, the target dimming level is set to an initial value (for example, 2%) regardless of the dimming level indicated by the dimming signal.

  According to such an operation, the same effects as those of the operation examples 1 and 2 can be obtained. Furthermore, when the power supply is detected, the light output is forcibly started from an initial value (for example, 2%), so that an undesired light output generated after the first power-on is reduced.

  Note that the target dimming level may be set to the initial value only when the immediately previous target dimming level is lost in the microcomputer 56 when the power is turned on. For example, in the second power-on detection shown in FIG. 6, the initial value setting of the target dimming level may be omitted.

(Operation example 4)
In the operation example 4, in the second period after the power OFF is detected, the response speed to the dimming level of the target dimming level is kept at the steady lighting according to the dimming level indicated by the dimming signal. , Choose to be slower.

  For example, in the second period, when the dimming level indicated by the dimming signal is equal to or higher than a predetermined value, the solid-state light-emitting element 70 is set to the dimming level at a response speed slower than the response speed during steady lighting. Dimming to the desired dimming level to follow the change. Further, when the dimming level indicated by the dimming signal is less than the predetermined value, the solid state light emitting device 70 is adjusted to a target dimming level that follows the change in the dimming level at a response speed during steady lighting. Shine.

  Therefore, in the second period, the dimming level represented by the dimming signal is compared with the predetermined value, and the response speed S2 is slower than the response speed S1 during steady lighting according to the comparison result. Or the response speed is maintained at the response speed S1 during steady lighting. Such comparison and switching of response speed are performed by the microcomputer 56 executing a program held in advance.

  For example, when the predetermined value is 100% and the ON duty of 5% of the dimming signal indicates the dimming level of 100% as shown in FIG. 10, the above operation is rewritten as follows. That is, in the second period, when the ON duty of the dimming signal is greater than 5%, the response speed S1 is selected, and when the ON duty of the dimming signal is 5% or less, the response speed S1 is slower. Response speed S2 is selected.

  As shown in FIGS. 7 and 8, for example, the response speed S1 is selected at the time of steady lighting, and the response speed S2 is selected in the first period after the power ON is detected. In the second period after the power OFF is detected, the response speed S1 or S2 is selected according to the comparison result between the dimming level represented by the dimming signal and the predetermined value. The response speed S2 is slower than the response speed S1, that is, S1> S2. The first period and the second period are shown according to FIG.

  In the second period, when the ON duty of the dimming signal is larger than 5%, that is, when the dimming level indicated by the dimming signal is less than 100%, the response speed S1 during steady lighting is maintained. However, only when the ON duty of the dimming signal is 5% or less (including the interruption of the dimming signal due to power loss), the response speed S2 is switched to the response speed S2 slower than the response speed S1 (FIG. 8). .

  Therefore, when the dimming level indicated by the dimming signal is not a high dimming level that induces an undesired light output at the momentary power failure / falling, the target dimming level is the same response speed S1 as that during steady lighting. To follow the change of dimming level. As a result, it is possible to obtain a lighting device that can reduce undesired light output generated when the power is turned on and off, and that does not impair the operational feeling during steady lighting.

  As mentioned above, although the lighting device concerning the present invention was explained based on the embodiment, the present invention is not limited to these embodiments. Unless it deviates from the gist of the present invention, one or more of the present invention may be applied to various modifications that can be conceived by those skilled in the art, or forms constructed by combining components in different embodiments. It may be included within the scope of the embodiments.

  For example, the lighting device 90 may be configured by the lighting device 85 and the solid light emitting element 70 that is dimmed by the lighting device 85.

  According to the luminaire 90 configured as described above, it is possible to obtain a luminaire that can reduce undesired light output generated when the power is turned on and off, and that does not impair the operational feeling during steady lighting.

  Moreover, you may comprise the illumination system 100 by the lighting fixture 90 and the light control signal generator 60. FIG.

  According to the illumination system 100 configured as described above, an illumination system that can reduce an undesired light output generated when the power is turned on and off, and that does not impair the operational feeling during steady lighting is obtained.

  INDUSTRIAL APPLICABILITY The present invention can be used as a lighting device for lighting solid light emitting elements such as light emitting diodes and organic EL elements, and a lighting fixture and a lighting system using the lighting device.

DESCRIPTION OF SYMBOLS 10 DC power supply 11 AC power supply 12 Input filter 13 Rectifier circuit 20 Lighting circuit 21 Step-up chopper circuit 22 Step-down chopper circuit 40 Power supply detection circuit 50, 55 Control circuit 51 Step-up control circuit 52 Dimming signal conversion circuit 54 Step-down control circuit 56 Microcomputer 57 Response Speed adjustment logic 60 Dimming signal generator 70 Solid state light emitting device 80, 85 Lighting device 90 Lighting fixture 100 Lighting system

Claims (6)

A lighting circuit that receives power and a control signal, and supplies a current corresponding to the control signal from the power to a solid state light emitting device;
A detection circuit for detecting start of power reception and stop of power reception;
An object of receiving a dimming signal indicating a dimming level of the solid-state light-emitting element and supplying the control signal to the lighting circuit to cause the solid-state light-emitting element to follow a change in dimming level indicated by the dimming signal. A control circuit for dimming to a dimming level;
With
The control circuit includes:
During steady lighting, the solid state light emitting device is dimmed to a target dimming level that follows a change in the dimming level at a predetermined response speed,
The solid-state light emitting element follows the change in the dimming level at a response speed slower than the response speed at the time of steady lighting for a predetermined period after at least one of power reception start and power reception stop is detected. A lighting device that dims to the desired dimming level. The control circuit follows the change in the light control level of the solid state light emitting element at different response speeds in a first period after detection of power reception start and in a second period after detection of power reception stop. The lighting device according to claim 1, wherein dimming is performed to a target dimming level. 3. The control circuit, after detecting the start of power reception, dims the solid state light emitting element to a target dimming level that starts from a predetermined dimming level and follows the change in the dimming level. The lighting device described in 1. The control circuit, in the second period after detection of power reception stop,
Only when the dimming level indicated by the dimming signal is equal to or higher than a predetermined dimming level, the solid state light emitting device follows the change in the dimming level at a response speed slower than the response speed at the time of steady lighting. Dimming to the desired dimming level,
When the dimming level indicated by the dimming signal is less than the predetermined dimming level, the target dimming level that follows the change in the dimming level at the response speed during steady lighting of the solid state light emitting device. The lighting device according to any one of claims 1 to 3.   The lighting fixture which consists of the lighting device of any one of Claims 1-4, and the said solid light emitting element light-modulated by the said lighting device.   An illumination system comprising the lighting fixture according to claim 5 and a dimming signal generator that supplies the dimming signal to the lighting device.

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