JPS586158Y2 - Daytime artificial lighting control device - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a daytime artificial lighting control device that utilizes daylight to effectively utilize energy by controlling indoor artificial lighting.

Conventional lighting devices of this type include those that continuously dim the light source for artificial lighting after detecting the brightness of daylight;
There is one that blinks every block to obtain a predetermined brightness.

Figure 1 is a block diagram showing a conventional flashing type daytime artificial lighting control device. In the figure, 1 is a light receiving element for detecting the brightness of external light, and 2 is an amplification unit for amplifying the signal of light receiving element 1. 3 is an illuminance setting circuit for setting the illuminance for blinking the light source, which will be described later; 4 is a comparison circuit for comparing the output of the amplifier circuit 2 and the output of the illuminance setting circuit 3; 5 is a commercial power supply; and 6 is the comparison circuit 4. This is a switching circuit that causes the light source 7 to blink depending on the output.

In the conventional device configured as described above, external light detected by the light receiving element 1 is amplified by the amplifier circuit 2 and then applied to the comparison circuit 4.

On the other hand, the illuminance setting circuit 3 determines the voltage that causes the light source I to blink, and this voltage is also applied to the comparison circuit 4.

The comparison circuit 4 compares both voltages, and if the output voltage of the amplifier circuit 2 becomes higher than the voltage of the illuminance setting circuit 3, it generates an output (hereinafter referred to as 1-HIGHJ) or disappears (hereinafter referred to as ``LO'').
"W".

). That is, the set voltage is used as a reference, and the output becomes "HIGHJ" or "LOW" depending on whether the voltage applied to the other end exceeds this voltage value.

If the output of such a comparison circuit 4 is applied to the switching circuit 6, the switching circuit 6 will turn rONj, "OFF",
The light source 7 performs a blinking operation to control the illumination.

Note that the setting voltage of the lighting setting circuit 3 is generally determined to be a different voltage depending on whether the light source 70 is turned on or off;
The brightness at which the light turns on is different from the brightness at which it turns off.

Furthermore, since one purpose of the flashing type daytime artificial lighting control device is to increase electric power, the artificial lighting is turned off when the outside light becomes bright.

2A to 2C are explanatory diagrams of the operation of the above-mentioned conventional device when the outside light changes drastically, respectively, where a shows the change in the brightness of the outside light, and L1 in this figure a shows the operation when the light source 7 is turned off. The brightness of outside light, L2, is the brightness of outside light when the light source 7 is turned on.

b indicates the "ON" and "OFF" operations of the switching circuit 6, and C indicates the blinking state of the light source 7. While the switching circuit 6 is "ON", the light source 7 is turned off.

Note that the horizontal axis in each figure indicates the passage of time.

As can be seen from Figures 2a to 2c, in the conventional device described above, when the outside light changes rapidly, the light source I blinks more frequently, which becomes a nuisance and only reduces the work efficiency of indoor workers. However, when the light source 7 is a fluorescent lamp, there are drawbacks such as a shortened lamp life.

In order to avoid this, it is conceivable to increase the difference between the set illuminances L1 and L2 in Figure 2a, but with this method, fine-grained control becomes impossible, the quality of illumination deteriorates, and the original function is lost. It has the disadvantage of becoming.

This idea was made to eliminate the above-mentioned drawbacks, and even when the external light changes rapidly or relatively slowly, it can blink effectively to save power and provide high-quality illumination. The purpose of the present invention is to provide a daytime artificial lighting control device.

An embodiment of this invention will be described below with reference to FIGS. 3 and 4.

FIG. 3 is a block diagram showing an embodiment of the daytime artificial lighting control device according to this invention. In the figure, 8 is an integrating circuit for integrating the output of the amplifier circuit 2, and 9 is an integrating circuit for integrating the output signal of the comparator circuit 4 for a certain period of time. A delay circuit 10 for delaying is compared with the output of the delay circuit 8, and the output of the delay circuit 9 is determined based on the output of the delay circuit 9.
This is a control circuit that outputs an output without changing the output if it conflicts with the output of the comparator circuit 4 when changing the output, and supplies the output to the switching circuit 6.

Since the other parts are the same as those in FIG. 1, the same parts are given the same reference numerals and the explanation thereof will be omitted.

FIGS. 4a to 4f are explanatory views of the operation of the device shown in FIG. 3, and particularly show the blinking state of the light source 7 when the outside light changes rapidly.

In these a to f, a indicates the change in the brightness of outside light, and in this figure a, L1 is the brightness of outside light when light source I is turned off, and L2 is the brightness of outside light when light source I is turned on. It is.

b is the output voltage of the integrating circuit 8 obtained by amplifying the output of the light receiving element 1 with the amplifier circuit 2 and then integrating it with the integrating circuit 8. In this figure, V1 is the voltage of the setting circuit 3 that turns off the light source 7, and V2 is the voltage of the light source 7. This is the voltage of the setting circuit 3 that turns on I.

C is the output voltage of the comparator circuit 4, d is the output voltage of the delay circuit 9, e is the output voltage of the scream circuit 10, and the output voltage of the switching circuit 6.
"N", "OFF" operation, f indicates the blinking state of the light source 7, and the light source I is turned off while the switching circuit 6 is operating.

Note that the horizontal axis in each figure indicates the passage of time.

Next, the operation of this device will be explained based on FIGS. 3 and 4.

That is, the external light received by the light receiving element 1 is amplified by the amplifier circuit 2, and therefore the output of the amplifier circuit 2 changes in proportion to the change in the external light.

The output of the amplifier circuit 2 is applied to the integrating circuit 8, which outputs the output voltage of the amplifier circuit 2, which changes rapidly, as a voltage with relatively little change (see FIG. 4).

The output voltage of the integrating circuit 8 is applied to the comparison circuit 4 together with the voltage of the illuminance setting circuit 3 corresponding to the set brightness levels L1 and L2 for blinking the light source 7.

The output of the comparator circuit 4 becomes "HIGH" when the output voltage of the integrating circuit 8 is lower than the voltage v1 that turns off the light source 7, as shown in FIG.
If it is less than 2, it becomes "LOW".

The output of the comparator circuit 4 is applied to the delay circuit 9. When the output of the comparator circuit 4 changes from l'-LOWJ to "HIGH", there is a delay of tl, and when it changes from "HIGHj" to "LOW", there is a delay of t2. The control ta4 i
.

(see Figure 4d).

The control circuit 10 compares the output of the delay circuit 9 and the output of the comparison circuit 4, and basically converts the signal from the delay circuit 9 into the output of the comparison circuit 11.
Output.

However, when the signal from the delay circuit 9 changes and it contradicts the output of the comparison circuit 4, the output is not changed.

For example, if the output of the comparator circuit 4 is "HIGH" when the signal of the delay circuit 9 changes from "HIGH" to "LOW" as after the delay time t2, the control circuit gives priority to the output of the comparator circuit 4. 10 does not change the output
I(l signal is transmitted to the switching circuit 6, and if the output of the comparison circuit 4 is "LOWJ" when the signal from the delay circuit 9 changes from rLOWJ to "HIGH", then "LOWJ"
The signal is transmitted to the switching circuit 6.

If the output of the control circuit 10 is HIGHJ, the switching circuit 6 becomes rON, I, and if the output is LOWI, it becomes OFF.

When this switching circuit 6 turns "ON" and "OFF", the light source 7 blinks, thereby controlling the illumination.

Figure 4f shows the blinking state of the light source I according to this device when there are relatively rapid changes in external light. Compared to the case of a device, the blinking frequency is also lower, and there are fewer cases where it becomes a nuisance.

In this way, in this embodiment, the state of external light is detected by the output of the comparator circuit 4, and a signal delayed in time from the state of external light is obtained from the delay circuit 9, and this delayed signal changes. If the state of external light has already changed, the frequency of blinking of the light source 7 is reduced by not switching the switching circuit 6.

Therefore, even if the light source T is a fluorescent lamp, there is no fear that the life will be shortened.

In the above embodiment, the light source 7 is turned off when the brightness of outside light is Ll and turned on when the brightness of outside light is L2, but the light source 7 is not limited to this, for example, when the brightness of outside light is L 7
It is also possible to turn on and perform iJT on L2.
The brightness at which the light source T blinks may be the same.

As explained above, according to this invention, external light is integrated,
In addition to generating a signal that lags behind changes in external light,
Since the state of external light at the time of this signal generation is detected and the light source 7 is made to blink, even when the external light changes rapidly, the frequency of blinking of the light source 7 can be minimized to achieve effective blinking. , high quality performance can be obtained.

In particular, the integrating circuit 8 has a characteristic that the response is fast when the input voltage change is large, and slow when the input voltage change is small. This makes it possible to effectively control inputs that change in various ways.

[Brief explanation of the drawing]

Fig. 1 is a block diagram of a conventional device, Figs. 2a to 2C are explanatory diagrams of the operation of the same device, Fig. 3 is a block diagram showing an embodiment of the daytime artificial lighting control device according to this invention, Fig. 4a 1 to 3 are explanatory diagrams of the operation of the invented device shown in FIG. 3. 1... Light receiving element, 2... Amplifying circuit, 3
...Illuminance setting circuit, 4...Comparison circuit,
6...Switching circuit, 7...Light source, 8...
...Integrator circuit, 9...Delay circuit, 10...
. . . Control circuit. Note that the same reference numerals in the figures indicate the same or corresponding parts.

Claims (2)

[Scope of utility model registration request] (1) In a lighting control device that controls indoor artificial lighting on and off based on the brightness of outside light, a light receiving element 1 that detects the brightness of outside light, an amplifying circuit 2 that amplifies the signal of the light receiving element 1, and an amplifying circuit 2 are used. The outputs of the integrating circuit 8 that integrates the voltage, the illumination setting circuit 3 that determines the brightness at which the artificial lighting flashes, the integrating circuit 8 and the illuminance setting circuit 3 are compared, and the results are set to "HIGH".
A comparison circuit 4 that generates a J or "LOW" digital signal, a delay circuit 9 that delays the output of the comparison circuit 4,
The output of the delay circuit 9 and the output of the comparator circuit 4 are compared, and if the output of the delay circuit 9 is inconsistent with the output of the comparator circuit 4 when the output of the delay circuit 9 changes, an output is output that does not change the output. , a control circuit 10 that provides the output to a switching circuit 6 that causes a light source 7 to blink. (2) The delay time of the delay circuit 9 is determined by the output of the comparator circuit 4 being J
From LOWj to “HIGHJ” and “HI
2. The daytime artificial lighting control device according to claim 1, wherein the daytime artificial lighting control device is different when changing from ``GH'' to ``LOW''.