JP3240592B2 - Lighting control device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lighting control device, and more particularly, to a dimming control device for a lighting fixture that performs stepwise dimming based on a result of detecting brightness and that strongly lights based on a result of detecting a human body. About.

2. Description of the Related Art An example of a conventional human body detection type illumination control device is shown in FIG. The lighting control device 1c includes a human body detection circuit 10, a control circuit 11, and a load drive circuit 12.

[0002] A human body detection circuit 10 is a circuit for detecting the presence of a human body by detecting infrared rays from the human body, and includes an infrared light receiving element 100, an amplification circuit 101, and a comparison circuit 102. Infrared detecting element 100
In general, what is called a pyroelectric element is used, and when infrared light emitted from the human body is collected on this pyroelectric element by an optical system such as a condenser lens, a detection signal is output from the pyroelectric element. Is done. Amplifying means 101 amplifies the detection signal, and comparing means 102 compares the signal level with a predetermined threshold level, and outputs the comparison result as a human body detection signal.

A control circuit 11 outputs a control signal to a load drive circuit 12 based on a result of detection of a human body, and the load drive circuit 12 controls on / off of an illumination load based on the control signal. On / off control). Therefore, when a human body is present in the detection area, the human body is detected and the lighting equipment is turned on, and when the human body is not detected, the lighting equipment can be turned off.

FIG. 10 shows another example of a conventional human body detection type illumination control device. The illumination control device 1d includes a human body detection circuit 10, a power supply circuit 14, a control circuit 11a, a step light control circuit 13, and a load drive circuit 12.

The power supply circuit 14 is a circuit that supplies power to each circuit in the lighting control device 1d and outputs a synchronization signal s based on a commercial AC power supply to the control circuit 11a. This synchronization signal s is generated with a zero cross point (a point where the voltage level crosses the zero level) of the commercial AC power supply as a synchronization timing.

The control circuit 11a outputs a strong lighting dimming signal based on the detection result of the human body. The dimming signal is a signal for strong lighting generated based on the synchronizing signal, and the control circuit 11a performs on / off control of the lighting load depending on whether or not the dimming signal is output. Step dimming circuit 13
Generates a step light control signal by controlling the phase of the light control signal. The step light control signal is generated by delaying the phase of the light control signal by a preset angle, and is output as a step light control signal having brightness according to the setting. Load drive circuit 1
2 controls the dimming of the lighting load based on the step dimming signal. Therefore, when the human body is detected, the lighting equipment is turned on at the set brightness, and when the human body is not detected, the lighting equipment can be turned off.

However, the conventional lighting control device as described above has the following problems.

First, when a human body is detected at night, the user may feel dazzling because the lighting equipment suddenly turns on strongly. With the latter among the above-mentioned lighting control devices, stepwise dimming can be performed, so that the brightness at the time of lighting can be adjusted. However, if an attempt is made to ensure sufficient brightness at the time of lighting, a similar problem may occur in the latter device.

[0008] These lighting control devices automatically turn off the light if a human body cannot be detected. However, there is a case where the light is suddenly turned off without being detected even though a person is in the room. Was. For example, when the lighting control device is used for controlling a lighting device of a toilet, there is a problem that the light is suddenly turned off even though there is a user in the toilet, which gives the user discomfort.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and performs stepwise dimming based on the result of brightness detection, and soft-lights by fading in when lighting a lighting fixture by detecting a human body. It is another object of the present invention to provide a lighting control device that gives a warning of turning off a lighting device when the lighting device is turned off (moving to stepwise dimming) because the human body cannot be detected or the lighting device is turned off.

According to a first aspect of the present invention, there is provided an illumination control apparatus including a brightness detection circuit and a human body detection circuit, and performs stepwise dimming of an illumination load by phase control based on the brightness detection result. An illumination control device for performing strong illumination of an illumination load based on a detection result of a human body, and includes a switching circuit, a soft dimming circuit, and a trigger synthesizing circuit.

The switching circuit outputs a step dimming signal from the step dimming circuit to a subsequent stage (trigger synthesis circuit) based on the detection result of the human body detecting circuit when the human body is not detected. This circuit outputs a strong lighting signal to the subsequent stage (soft dimming circuit).

The soft dimming circuit controls the phase of the strong lighting signal output from the switching circuit when the detection of a human body is started.
This circuit outputs a soft dimming signal to the trigger synthesizing circuit, and fades in the illumination load to shift from stepwise dimming to strong lighting.

The soft dimming circuit includes a charge / discharge circuit, a threshold level generation circuit, and a comparison circuit.

The charge / discharge circuit is a circuit that is charged or discharged in accordance with the level of an input signal, and can be composed of, for example, a capacitor and a resistor. The charge / discharge circuit receives a strong lighting signal from the switching circuit, charges and discharges the capacitor by a pulse included in the strong lighting signal, and outputs a voltage between the terminals of the capacitor as a charge / discharge level to the comparison circuit. .

The threshold level generation circuit is a circuit for generating a threshold level to be compared with the charge / discharge level in the comparison circuit, and based on the detection result of the human body detection circuit, for a predetermined period from the start of human body detection. The threshold level is sequentially changed.

The comparison circuit compares the charge / discharge level with the threshold level, and generates a soft dimming signal in which the strong lighting signal is phase-controlled based on the comparison result. Here, the dimming signal is a signal given as a pulse train, and the brightness is expressed by the phase of each pulse.

The trigger synthesizing circuit is a circuit for synthesizing a stage dimming signal output from the switching circuit and a soft dimming signal output from the soft dimming circuit and outputting a synthesized dimming signal. The lighting load is drive-controlled based on the dimming signal.

Here, the intense lighting means lighting at the brightness at the time of normal lighting without step light control, or lighting at the maximum brightness or higher brightness in step light control. I do. Fade-in means that when increasing the brightness (illuminance) of a lighting fixture, the illuminance of the lighting fixture is changed so that it becomes brighter sequentially with the elapse of time. Means to tighten.

According to a second aspect of the present invention, in the illumination control apparatus, the soft dimming circuit includes a plurality of charge / discharge circuits, a time constant switching circuit, a threshold level generation circuit, and a comparison circuit. You.

Each of the plurality of charge / discharge circuits is configured as a circuit having a different time constant, and a strong lighting signal from the switching circuit is input to any one of the selected charge / discharge circuits.
The charge / discharge level of the charge / discharge circuit is input to the comparison circuit.

The time constant switching circuit outputs a switching signal based on the detection result of the human body detection circuit, selects the charging / discharging circuit, and sequentially changes the time constant of the charging / discharging circuit for a predetermined period from the start of the detection of the human body. To change.

The comparison circuit is a circuit that compares the charge / discharge level with the threshold level, and generates a soft dimming signal in which the phase of the strong lighting signal is controlled based on the comparison result.

According to a third aspect of the present invention, there is provided an illumination control apparatus according to the first or second aspect, further comprising a timer circuit, wherein the step dimming circuit is turned off based on the timer signal. It is configured as means for outputting a dimming signal for a notice.

This timer circuit, based on the detection result of the human body detection circuit, after the end of the human body detection (after the transition from the state where the human body is detected to the state where the human body is no longer detected)
A circuit that outputs a timer signal during a predetermined time.

Based on the timer signal, the step light control circuit outputs a turn-off notice light control signal that is darker than strong light and brighter than step light control. That is, in a normal state, a step dimming signal of a preset brightness is output, and when a timer signal is input from a timer circuit, a turn-off notice dimming signal is output.

Since the step-out dimming circuit outputs the turn-off notice dimming signal when the human body is not detected, the switching circuit outputs the lighting notice dimming signal to the subsequent stage. Therefore, after the lighting load is turned on darker than the strong lighting and brighter than the step light control for a predetermined period, the light load is turned off or shifted to the step light control.

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a lighting control device according to the present invention will be described below with reference to the drawings. First, FIG. 1 shows a configuration example of a lighting control device according to the present invention.

The lighting control device 1a includes a human body detection circuit 1
A switching control circuit 30, a soft dimming circuit 31, and a trigger synthesizing unit 3
2 is provided.

The switching circuit 30 receives a dimming signal a2 based on human body detection and a dimming signal b3 based on brightness detection. The switching circuit 30 is an interlocking switching means that switches under the control of the human body detection control circuit 11a, and outputs one of these dimming signals a2 and b3 to the subsequent stage. That is, when a human body is detected, the dimming signal a2 based on the human body detection is output to the soft dimming circuit 31 as the dimming signal a3, and when the human body is not detected, the dimming signal b3 based on the brightness detection is triggered as the dimming signal b4. Output to the synthesis circuit 32.

The light control signal a2 based on the human body detection is a light control signal output by the human body detection control circuit 11a based on the human body detection signal a1. The dimming signal a2 is a lighting control ON signal output when a human body is detected, and can be a dimming signal for strong lighting.

Here, the human body detection circuit 10 is configured as a circuit similar to the infrared type human body detection circuit shown in FIG. The detection signal a1 output from the human body detection circuit 10
, The human body detection control circuit 11a determines the presence or absence of a human body, and outputs the determination result as a control signal ctr to the switching circuit 30 and the soft dimming circuit 31. When it is determined that a human body is present (when a human body is detected), the dimming signal a2 is output to the switching circuit 30.

The human body detection control circuit 11a receives a synchronizing signal s for giving a zero-cross point of the commercial AC power supply,
4 and outputs this synchronization signal as a dimming signal when a human body is detected. Therefore, the dimming signal a2
Is a dimming signal for strong lighting. In this example,
Lighting at the maximum brightness without stepwise dimming is defined as strong lighting.

On the other hand, the dimming signal b3 based on the brightness detection is
This is a light control signal generated by the brightness detection control circuit 21 and subjected to step light control by the step light control circuit 22. The dimming signal b3 is output when the surroundings become dark, and is a dimming signal for lighting the lighting fixture with a preset brightness.

Here, the brightness detection circuit 20 is a circuit that measures the brightness of the surroundings and outputs a detection signal b1, and a brightness detection control circuit 21 determines a predetermined value based on the detection signal b1. It is determined whether it is darker than the brightness of. When it is determined that the image is dark (at the time of dark detection), a dimming signal b2 is output. The light control signal b2 is a light control signal for strong lighting generated by the synchronization signal s from the power supply circuit 14, similarly to the light control signal a2.

The dimming signal b2 is input to the step dimming circuit 22, is step-dimmed to a predetermined brightness, and is output as a dimming signal b3. This step dimming is performed by phase control, and a dimming signal b3 whose brightness has been adjusted is generated by delaying the phase of the dimming signal b2 for strong lighting by a preset phase angle.

The soft dimming circuit 31 is a circuit that controls the phase of the strongly lit dimming signal a3 output from the switching circuit 30 and outputs it as a soft dimming signal a4. This phase control delays the phase for a certain period when the lighting apparatus is turned on when a human body is detected, and is a control for performing a fade-in by decreasing the phase to be delayed as time passes. This fade-in
The soft dimming circuit 31 is started by determining a change from non-detection to detection of a human body based on a change in the control signal ctr from the human body detection control circuit 11a. It should be noted that the human body detection control circuit 11a can be configured not to output a dimming signal even when a human body is detected when the surroundings are bright, based on the brightness detection result.

The trigger synthesizing circuit 32 includes the soft dimming circuit 3
1 and the soft dimming signal a4 output from the switching circuit 30
This is a circuit that combines the dimming signal b4 output from the controller and outputs a combined dimming signal c. The switching circuit 30 switches and selects one of the dimming signals a3 and b4 according to the presence or absence of the human body detection and outputs it. Therefore, the combined dimming signal c is
This is a signal obtained by combining the soft dimming signal a4 when the human body is detected and the dimming signal b4 when the human body is not detected. Load drive circuit 12
Drives an illumination load based on the combined dimming signal c. At this time, ON / OFF of the lighting load corresponds to the presence or absence of the dimming signal c, and the brightness of the lighting load corresponds to the phase of the dimming signal c.

Thus, when a human body is detected,
By the switching circuit 30 stopping the output of the step light control signal b4 and starting the output of the light control signal a3, the control of the lighting load can be shifted from the step light control by the brightness detection to the strong lighting by the human body detection. . In addition, at the time of this transition, the soft dimming circuit can perform the phase control on the dimming signal a3 for a certain period after the start of the human body detection, and can make the transition to the strong lighting by performing the fade-in.

The operation of the illumination control device shown in FIG. 1 will be described with reference to FIG. FIG. 2 is a timing chart showing changes in main signals of the lighting control device.

The lightness detection signal b1 is a lightness detection result output from the lightness detection circuit 20. The lightness detection signal b1 has a low level when the surroundings are bright, but changes to a high level when the surroundings are dark.
When the brightness detection signal b1 goes high, the brightness detection control circuit 21 outputs a dimming signal b2. The dimming signal b2 is a pulse signal output at each zero-cross timing of the commercial AC power supply. The dimming signal b2 is phase-controlled by the stage dimming circuit 21, and is output from the switching circuit 30 as a dimming signal b4 whose phase is delayed by a predetermined angle when a human body is not detected.

The human body detection signal a1 is a detection result of a human body output from the human body detection circuit 10, and changes to a high level when a human body is detected. When the human body detection signal a1 goes high, the human body detection control circuit 11a outputs a dimming signal a2.
(Not shown), and the dimming signal a3 is output from the switching circuit 30.
Is output as This light control signal a3 is equivalent to the light control signal b2.
Similarly to the above, the pulse signal is a pulse signal output at every zero-cross timing of the commercial AC power supply, and is controlled in phase by the soft dimming circuit 31 to become a soft dimming signal a4.

The soft dimming signal a4 is a signal obtained by delaying the phase of the dimming signal a3 for the strong lighting for a predetermined period (soft lighting period) after the detection of the human body. It becomes smaller as time passes, and becomes a strong lighting signal after the soft lighting period elapses.

The combined light control signal c is a light control signal obtained by combining the light control signal b4 based on the brightness detection and the light control signal a4 based on the human body detection, and is given as a logical sum of the light control signal b4 and the light control signal a4. Can be

The drive signal d is obtained by converting the commercial AC power supply to the dimming signal c.
Are generated by switching at the timing of each pulse (chopper method) and supplied to the lighting load. Therefore, as the phase of each pulse of the composite dimming signal c is delayed from the zero crossing of the commercial AC power supply, the effective value of the drive signal d is reduced, and the lighting of the illumination load is darkened. During the soft lighting period, the phase delay gradually decreases, so that the lighting load gradually becomes brighter.

FIG. 3 is a diagram showing a configuration example of the soft dimming circuit 31 in the illumination control device 1a shown in FIG.

The soft dimming circuit 31 includes a charge / discharge circuit 3
10, a threshold level generation circuit 311 and a comparison circuit 312
It is composed of The charging / discharging circuit 310 includes the switching circuit 3
This is a circuit that performs charging and discharging according to the signal level of the dimming signal a3 output from 0, and can be configured as a CR time constant circuit including a capacitor.

The threshold level generation circuit 311 is
12 is a circuit for generating a threshold level for comparison with the output of the charging / discharging circuit 310.
It changes during the soft lighting period based on the control signal ctr from the human body detection control circuit 11a.

The comparison circuit 312 compares the charge / discharge level output from the charge / discharge circuit 310 with the threshold level Vth output from the threshold level generation circuit 311, and based on the comparison result, controls the phase of the dimming signal a 3. A light control signal a4 is generated. That is, the phase delay of the light control signal a4 with respect to the light control signal a3 is determined by the CR time constant of the charge / discharge circuit 310 and the threshold level V
is determined by th.

The operation of the soft dimming circuit 31 will be described with reference to FIG. FIG. 4 is a timing chart showing changes in main signals of the lighting control device. The “input of the comparison circuit” indicates both the charge / discharge level and the threshold level Vth which are the inputs of the comparison circuit 312, and the result of comparing these is shown as “comparison result”.

The soft dimming signal a4 is obtained from the “comparison result”.
Has been generated based on That is, if the charge / discharge level is higher than the threshold level Vth, the “comparison result” becomes a high level, and the dimming control signal a4 becomes the first high level after the commercial AC power supply passes through the zero cross. It is generated by outputting a pulse at that point.

At this time, by gradually lowering the threshold level Vth, the period from the zero crossing point of the commercial AC power supply to the rise of the “comparison result” is shortened.
Therefore, the phase delay of the dimming signal a4 with respect to the dimming signal a3 gradually decreases, and the illumination gradually increases in brightness, and finally reaches strong lighting. In this manner, soft lighting, that is, fade-in control at the time of detecting a human body can be performed.

FIG. 5 is a diagram showing another configuration example of the soft dimming circuit 31 in the illumination control device 1a shown in FIG.

The soft dimming circuit 31 includes a charge / discharge circuit group 310 ′, a threshold level generating circuit 311 ′, a comparing circuit 312, and a time constant switching circuit 313.
The comparison circuit 312 is the comparison circuit 31 used in FIG.
2 and a threshold level generation circuit 311 '.
Is a circuit for generating a predetermined constant threshold level Vth.

The charge / discharge circuit group 310 'includes a plurality of charge / discharge circuits 310 (not shown) having different time constants.
One of these charge / discharge circuits 310 is selected and used by the time constant switching circuit 313.

The time constant switching circuit 313 outputs a switching signal to the charge / discharge circuit group 310 'based on the control signal ctr from the human body detection control circuit 11a and the dimming signal a3 from the switching circuit 30. That is, when a human body is detected, a switching signal is output from the time constant switching circuit 313 every time the pulse of the dimming signal a3 arrives, and the charge / discharge circuit 310 to be used is sequentially switched to one having a smaller time constant. .

The switching signal may be output every time a predetermined number of pulses arrive, or may be output every time a predetermined time that is sufficiently shorter than the soft lighting period elapses. it can.

As described above, during a predetermined period (soft lighting period) after the detection of the human body, the time constant of the charge / discharge circuit 310 used in the preceding stage of the comparison circuit 312 is gradually reduced, and the output from the comparison circuit 312 is reduced. The phase delay of the light control signal a4 with respect to the light control signal a3 can be gradually reduced, and the light control signal a4 can be used as a signal for strong lighting after the soft lighting period has elapsed.

The operation of the soft dimming circuit will be described with reference to FIG. FIG. 6 is a timing chart showing changes in main signals of the lighting device. `` Input of comparison circuit ''
And "Comparative results" are shown in the same manner as FIG. In addition, the soft dimming signal a4 is generated based on the “comparison result” as in the case of FIG.

In this case, by gradually decreasing the time constant, the time from the zero crossing point of the commercial AC power supply to the rise of the charge / discharge level is gradually shortened. For this reason, the phase delay of the dimming signal a4 with respect to the dimming signal a3 gradually decreases, and the illumination gradually increases in brightness, leading to strong lighting. In this manner, soft lighting, that is, fade-in control at the time of detecting a human body can be performed.

Next, another configuration example of the illumination control device according to the present invention is shown in FIG. This lighting control device 1b is configured by further adding a timer circuit 40 to the lighting control device 1a shown in FIG.

The timer circuit 40 includes the human body detection control circuit 11
This is a circuit that outputs a timer signal t for a predetermined period T1 based on the control signal ctr from a for a predetermined period T1 after the human body is no longer detected. The step dimming circuit 22 is configured as a means for outputting a turn-off notice dimming signal that is darker than strong lighting and brighter than step dimming, based on the timer signal t.

The operation of the illumination control device 1b will be described with reference to FIG. FIG. 8 is a timing chart showing changes in main signals of the lighting device.

When the human body detection signal a1 changes from the high level to the low level, that is, when the state changes from the human body detection state to the non-human body detection state, the switching circuit 30 outputs the dimming signal a3 by the human body detection. Is stopped, and the output of the dimming signal b4 by the brightness detection is started. At this time, the timer signal t is output during a predetermined period T1 until the timer circuit 40 is started up and the timer circuit 40 times out, and the step light control circuit 22 outputs the intermediate light between the strong lighting and the step light control. Is output as a dimming signal b4 from the switching circuit 30.

For this reason, during the predetermined period T1 when the human body is not detected, the lighting fixture is turned on, which is darker than the lighting (strong lighting) by the human body detection but brighter than the stepwise dimming, and gives a notice of turning off. it can.

According to the first to third aspects of the present invention, the illumination control device according to the present invention detects ambient brightness, performs stepwise dimming when it is dark, and fades when it detects a human body. Intense lighting is performed by IN.

Accordingly, it is possible to provide a lighting control device that does not make a user feel dazzling due to sudden lighting when a human body is detected at night.

According to the fourth aspect of the present invention, when the human body can no longer be detected, the lighting control apparatus performs lighting of a darkening notice that is darker than the strong lighting and brighter than the stepwise dimming for a predetermined period. .

Therefore, it is possible to provide a lighting control device which does not give a user uncomfortable feeling by suddenly turning off the light because no human body can be detected in a toilet at night or the like.

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration example of a lighting control device according to the present invention.

FIG. 2 is a timing chart showing changes in main signals of the illumination control device shown in FIG.

FIG. 3 is a diagram showing a configuration example of a main part of a lighting control device according to the present invention.

4 is a timing chart showing changes in main signals of the illumination control device whose main parts are shown in FIG.

FIG. 5 is a diagram illustrating another configuration example of a main part of the lighting control device.

6 is a timing chart showing changes in main signals of the illumination control device whose main parts are shown in FIG.

FIG. 7 is a diagram showing another configuration example of the lighting control device according to the present invention.

8 is a timing chart showing changes of main signals of the lighting control device shown in FIG. 7;

FIG. 9 is a diagram illustrating a configuration example of a conventional illumination control device.

FIG. 10 is a diagram illustrating another configuration example of a conventional lighting control device.

[Explanation of symbols]

 1a, 1b: Illumination control device 10: Human body detection circuit 20: Brightness detection circuit 22: Step dimming circuit 30: Switching circuit 31: Soft lighting circuit 32: Trigger synthesis Circuit 310: Charge / discharge circuit 311: Threshold level generation circuit 312: Comparison circuit 313: Time constant switching circuit 40: Timer circuit

────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Kazuko Kawahara 1048 Odakadoma, Kadoma, Osaka Prefecture Inside Matsushita Electric Works, Ltd. (56) References JP-A-64-3986 (JP, A) JP-A-2-103897 (JP, A) JP-A-7-130475 (JP, A) JP-A-1-158697 (JP, U) JP-A-5-59798 (JP, U) (58) Fields investigated (Int. Cl. ⁷⁾ , DB name) H05B 37/00-39/10

Claims (3)

(57) [Claims] An illumination control comprising a lightness detection circuit and a human body detection circuit, performing stepwise dimming of an illumination load by phase control based on the lightness detection result, and strongly lighting the illumination load based on a human body detection result. In the device, when a human body is not detected, a step dimming signal from the step dimming circuit is output to a subsequent stage, and when a human body is detected, a switching circuit that outputs a strong lighting signal to a subsequent stage, and output from the switching circuit. A soft dimming circuit that controls the phase of the strong lighting signal at the start of detection of a human body, fades in an illumination load and shifts to strong lighting, and the step dimming signal output from the switching circuit; A trigger synthesizing circuit for synthesizing a soft dimming signal output from the soft dimming circuit; the soft dimming circuit includes a charge / discharge circuit charged / discharged by the pulse of the strong lighting signal; A threshold level generation circuit that generates a bell, and a comparison circuit that compares the outputs of the charge / discharge circuit and the threshold level generation circuit, wherein the threshold level generation circuit has a predetermined period after detection of a human body, An illumination control device configured as a circuit for changing a threshold level, wherein a transition from step dimming to strong lighting is performed by fade-in control when a human body is detected. 2. A lighting control system comprising a brightness detection circuit and a human body detection circuit for performing stepwise dimming of an illumination load by phase control based on the detection result of the brightness and for strongly lighting the illumination load based on the detection result of the human body. In the device, when a human body is not detected, a step dimming signal from the step dimming circuit is output to a subsequent stage, and when a human body is detected, a switching circuit that outputs a strong lighting signal to a subsequent stage, and output from the switching circuit. A soft dimming circuit that controls the phase of the strong lighting signal at the start of detection of a human body, fades in an illumination load and shifts to strong lighting, and the step dimming signal output from the switching circuit; A trigger synthesizing circuit for synthesizing a soft dimming signal output from the soft dimming circuit, wherein the soft dimming circuit includes a plurality of charge / discharge circuits having different time constants; A time constant switching circuit for inputting the strong lighting signal, a threshold level generating circuit for generating a predetermined predetermined threshold level, the charge / discharge circuit and the threshold level generating circuit selected for switching And a comparison circuit that compares the outputs of the two.The time constant switching circuit fades the transition from step dimming to strong lighting at the time of human body detection by sequentially switching the charge / discharge circuit at the start of human body detection. A lighting control device characterized by performing in-control. 3. The lighting control device according to claim 1, further comprising a timer circuit for outputting a timer signal for a predetermined time after the human body is no longer detected after the human body is detected. An illumination control device, wherein the optical circuit is configured as means for outputting a turn-off notice dimming signal that is darker than strong lighting and brighter than stepwise dimming based on the timer signal.