JP3660015B2 - Constant output lighting controller - Google Patents

Abstract

PURPOSE: To reduce the flicker and cyclic light and darkness owing to the change of light flux by making the voltage of a capacitor be an output signal, and off-controlling a switch when an illuminance detection signal stays between predetermined reference signal levels. CONSTITUTION: A comparator 13 compares the output signal voltage V1 of an illuminance detection circuit 11 with the output signal voltage V2 of an illuminance setting circuit 12, and outputs a low or high level signal voltage V3 to a time constant circuit 14 depending on whether the voltage V1 exceeds the voltage V2 or not. In the circuit 14 when the voltage V3 is at a high level, the voltage of a capacitor C1 rises according to a predetermined time function, and when the voltage V3 is at a low level, the voltage V4 falls according to a predetermined time function. When the signal V1 stays between first reference signal level V6 and second reference signal level V7 , a control signal generating circuit sends the output signal of the voltage V4 of the capacitor C1 to a comparator 18 so as to off-control a switch SW. The switch SW is turned off so that the voltage V4 is maintained until V1 >V6 is met, and thereafter, the switch SW is turned on.

Description

[0001]
[Industrial application fields]
The present invention relates to a constant output lighting control device for controlling the luminous flux of a lamp or other light source.
[0002]
[Prior art]
There is a constant output type lighting control device that installs an illuminance sensor in a room and controls a voltage applied to a light source based on a detection signal detected by the illuminance sensor in order to keep the illuminance in the room constant. FIG. 3 shows a control signal generation circuit of such a constant output type lighting control device. Reference numeral 1 denotes an illuminance sensor such as a CDS installed indoors, and an illuminance detection signal detected by the illuminance sensor is input to the comparator 2. Compared with the illuminance setting signal set by the illuminance setting device 3, the voltage applied to the light source is controlled based on this comparison output.
[0003]
[Problems to be solved by the invention]
However, if such an illuminance detection signal is controlled by the magnitude of one illuminance setting signal to control the voltage applied to the light source, the illuminance setting signal detected by the illuminance sensor 1 is set by the illuminance setting device 3. When it becomes larger, the voltage applied to the light source is lowered, and when the illuminance detection signal detected by the optical sensor 1 becomes smaller than the illuminance setting signal set by the illuminance setting device 3, the voltage applied to the light source is raised. There has been a problem in that the phenomenon is repeated relatively frequently, and as a result, a flicker occurs due to an increase or decrease in the luminous flux of the light source, and a phenomenon occurs in which the light is periodically bright and dark.
[0004]
The present invention has been made in view of the above problems, and an object of the present invention is to provide a constant output type lighting control device that can reduce flicker and periodic brightness due to a change in the luminous flux of a light source and obtain a stable and constant illuminance. To do.
[0005]
[Means for Solving the Problems]
The object of the present invention is achieved by the following (1), (2) and (3). (1) A comparator that compares the illuminance detection signal level with the illuminance setting signal level, a capacitor that charges and discharges according to the output of the comparator, a time constant circuit that includes a switch that controls on / off of the charge and discharge, and the illuminance Each of the first reference signal level higher than the set signal level and the second reference signal level lower than the illuminance setting signal level is compared with the illuminance detection signal level, and the illuminance detection signal level is compared with the first reference signal level. A control signal generation circuit comprising a comparator that outputs a signal for turning off the switch when the level is between the second reference signal level and the voltage of the capacitor as an output signal. A constant output lighting control device.
[0006]
(2) a comparator that compares the illuminance detection signal level with the illuminance setting signal level, a capacitor that charges and discharges according to the output of the comparator, a time constant circuit that includes a switch that controls on / off of the charge and discharge, and the illuminance An amplifier that doubles the setting signal level, and an illuminance setting that divides the output of the amplifier to form a first reference signal level that is higher than the illuminance setting signal level and a second reference signal level that is lower than the illuminance setting signal level The illuminance detection signal level is compared with the first reference signal level and the second reference signal level of the range adjustment circuit and the illuminance setting range adjustment circuit, and the illuminance detection signal level is compared with the first reference signal level. A comparator that outputs a signal for controlling the switch to turn off when the level is between the second reference signal level and the capacitor Constant output lighting control apparatus characterized by comprising a control signal generating circuit for the output signal voltage.
[0007]
(3) a first comparator that compares the illuminance detection signal level with the illuminance setting signal level, a capacitor that charges and discharges according to the output of the comparator, and a time constant circuit that includes a switch that controls on / off of the charge and discharge; Each of the first reference signal level higher than the illuminance setting signal level and the second reference signal level lower than the illuminance setting signal level is compared with the illuminance detection signal level, and the illuminance detection signal level is the first illuminance detection signal level. A second comparator for outputting a signal for controlling the switch to be turned off when the reference signal level is between the second reference signal level and the second reference signal level; And a display circuit for displaying the output signal when it deviates from between the first and second reference signal levels. Constant output lighting control apparatus characterized by comprising a control signal generation circuit that.
[0008]
[Action]
According to the above configuration of the present invention, when the illuminance detection signal level is located between the first reference signal level and the second reference signal level, the control signal is fixed at that time, and the illuminance detection signal level becomes the first reference signal level. As long as the level is between the level and the second reference signal level, even if the illuminance detection signal level changes, the voltage applied to the light source is controlled based on the fixed control signal. Therefore, the light flux of the light source does not change according to a slight change in illuminance, and flicker and periodic light and darkness due to the change of the light flux of the light source are reduced, and a stable and constant illuminance can be obtained.
[0009]
In addition, when the illuminance detection signal level deviates from between the first and second reference signal levels for a predetermined time, providing a display circuit for displaying it makes it easy to provide an indication of abnormality of the light source or lighting control device or replacement of the light source. It becomes possible to know.
[0010]
【Example】
Embodiments of the present invention will be described below with reference to FIGS. FIG. 1 is a block circuit diagram of a control signal generation circuit of a constant output type lighting control apparatus according to an embodiment of the present invention, and FIG. 2 is an operation explanatory diagram of the control signal generation circuit of FIG.
[0011]
In FIG. 1, 11 is an illuminance detection circuit, 12 is an illuminance setting circuit, 13 is a comparator, 14 is a time constant circuit, 15 is an impedance conversion circuit, 16 is an amplifier, 17 is an illuminance setting range adjustment circuit, 18 is a window comparator, 19 Represents a timer circuit, and 20 represents a display circuit.
[0012]
Illuminance detecting circuit 11 is provided with an illuminance sensor D ₁ of the like CDS that is installed in an appropriate position, such as luminaires not receiving direct light from the light source, and an output signal level that is, the output signal voltage of light increases in this embodiment V ₁ is set to be small, and the output signal voltage V ₁ is sent to the comparator 13 and the window comparator 18. Luminance setting circuit 12 includes a variable resistor R ₁₂ to set the illumination, the output signal level that is, the output signal voltage V ₂ and the comparator 13 is sent to the magnification twice the amplifier 16.
[0013]
The comparator 13 compares the output signal voltage of the illuminance detection circuit 11 (hereinafter referred to as “illuminance detection signal voltage”) V ₁ and the output signal voltage of the illuminance setting circuit 12 (hereinafter referred to as “illuminance setting signal voltage”) V _2. The low-level or high-level signal voltage V ₃ is output to the time constant circuit 14 depending on whether or not the illuminance detection signal voltage V ₁ exceeds the illuminance setting signal voltage V ₂ .
[0014]
The time constant circuit 14 includes resistors R8, made from the bidirectional analog switch SW and a capacitor C ₁ Tokyo, bidirectional analog switch SW when the output signal voltage V ₁₀ from the window comparator 18 is at a high level is driven on. This output signal voltage V _4, that is, the voltage V ₄ of the capacitor C ₁ is the initial value V ₀ when the output signal voltage V ₃ of the comparator 13 is at a high level under the condition that the bidirectional analog switch SW is driven on. V ₄ = V ₃ × [1-exp (−t ÷ R ₈ C ₁ )] + V ₀ , and when the output V _{3 of the} comparator 13 is at a low level, V ₄ = It descends according to the time function of V ₃ × [exp (−t ÷ R ₈ C ₁ )] + V ₀ .
[0015]
Then, a voltage voltage V ₄ of the output signal voltage V ₄ i.e. the capacitor C ₁ is applied to the light source via the impedance conversion circuit 15, for example, high and low switching control of the voltage, or a voltage control circuit (not controlled by the duty control, etc. None).
[0016]
The illuminance setting range adjustment circuit 17 is a circuit for setting the illuminance setting range. The illuminance setting range adjustment circuit 17 outputs the output signal voltage V ₅ of the amplifier 16 that is twice the illuminance setting signal voltage V _2, that is, V ₅ = 2V ₂ (R ₃ = R in this embodiment). ₄ is divided by a circuit in which a resistor R ₅ , a resistor R ₆ , and a resistor R ₇ are connected in series, and a connection point between the resistor R ₅ and the resistor R ₆ , that is, a first divided voltage (hereinafter referred to as “first voltage”). 1 is referred to as a “reference voltage”.) V ₆ and a connection point between the resistor R ₆ and the resistor R ₇ , that is, a second divided voltage (hereinafter referred to as “second reference voltage”) V ₇ are output.
[0017]
The first and second reference voltages V ₆ and V ₇ are respectively V ₆ = [(R ₆ + R ₇ ) ÷ (R ₅ + R ₆ + R ₇ )] × V ₅ , V ₇ = [R ₇ ÷ (R ₅ + R ₆ + R ₇ )] × V ₅ , and the relationship between the voltages is V ₅ > V ₆ > V ₂ > V _{7. In} this embodiment, (V ₆ + V ₇ ) ÷ 2 = V ₂ the resistance value of the resistor R ₆ is set. That is, the illuminance detection signal voltage V ₁ is a maximum (this time illuminance at the lowest) descent and go (go illuminance increased) from the V ₁ was related to sequentially pass V _6, V _2, V ₇ It is in. The resistor R ₆ may be variable resistors, in this case, is adjusted as necessary difference between the first reference voltage and a second reference voltage, i.e., the width of the first reference voltage and a second reference voltage be able to.
[0018]
The window comparator 18 inputs the first reference voltage V ₆ to the inverting side, the first comparator D ₁ that inputs the illuminance detection signal voltage V ₁ to the non-inverting side, and the second reference voltage V ₇ to the non-inverting side. And the second comparator D ₂ that inputs the illuminance detection signal voltage V ₁ to the inversion side. The output V ₈ of the first comparator D ₁ is the illuminance detection signal voltage V ₁ being the first reference voltage V _6. becomes high level when greater than, the output V ₉ of the second comparator D ₂ is at the high level when the illuminance detection signal voltage V ₁ is smaller than the second reference voltage V _7. The output voltages V ₈ and V _{9 of the} comparators D ₁ and D ₂ are sent as the voltage V ₁₀ that drives the bidirectional analog switch SW of the time constant circuit 14.
[0019]
The timer circuit 19 and the display circuit 20 indicate an abnormality of the light source or the lighting control device or switching of the illuminance setting value (switching from about 70% driving at the beginning of the light source to 100% driving due to a decrease in luminous flux) or the like. It intended to display the like, when the output of the second comparator D ₂ of the high level of the window comparator 18 in this embodiment is predetermined time or longer, i.e. displayed when the illuminance is not reduced even after more than a predetermined time Have been to. When the first較器D ₁ of the high-level output of the window comparator 18 continues more than a predetermined time, that may be displayed when the illuminance does not increase even after more than a predetermined time, the In this case, it can be used as a guide for replacing the light source.
[0020]
Referring now to reference to operate the Figure 2, in all the horizontal axis is the time axis in FIG. 2, a pseudo signal for (a) but is rice shows a change in the illuminance detection signal voltages V ₁ Operation is there. First, in the initial state (t ₀ = 0), the amount of light received by the illuminance sensor S ₁ is set to zero. At this time, the voltage V ₄ (FIG. 2D) of the capacitor C ₁ of the time constant circuit 14 is set to the voltage of the power supply line. When Vb, that is, V ₄ = Vb, the illuminance detection signal voltage V ₁ is sufficiently larger than the illuminance setting signal voltage V ₂ , and the output voltage V ₃ (FIG. 2B) of the comparator 13 is at a low level, that is, V ₃ = 0. It is.
[0021]
Further, the illuminance detection signal voltage V ₁ is larger than the first reference voltage V ₆ , and the output V ₈ of the first comparator D ₁ of the window comparator 18 becomes a high level, whereby the output voltage V ₁₀ of the window comparator 18 is The bidirectional analog switch SW of the time constant circuit 14 is driven on (FIG. 2 (c)).
[0022]
In this state, the amount of light received by the illuminance sensor S ₁ increases and the illuminance detection signal voltage V ₁ decreases, but V ₁ > V ₂ and V ₃ = 0 until V ₁ > V _6. The analog switch SW is V ₁ > V ₆ , so that V ₈ is at a high level and is therefore on. As a result, the voltage V ₄ of the capacitor C ₁ of the time constant circuit 14 decreases according to the time function of V ₄ = Vb × [exp (−t ÷ R ₈ C ₁ )], and the luminous flux of the light source is increased.
[0023]
After lapse of t ₁ seconds from the initial state, the illuminance detection signal voltage V ₁ reaches the first reference voltage V _6, and when V ₆ > V ₁ > V ₇ , the first comparator D ₁ and the second comparator of the window comparator 18 any of the D ₂ becomes low level, the analog switch SW to output a low level of window comparator 18 is turned off. Off of the analog switch SW maintains the state when the voltage V ₄ of capacitor C _1.
[0024]
V ₄ at this time is Vb × [exp (−t ₁ ÷ R ₈ C ₁ )]. During this time, when V ₁ decreases and V ₂ > V ₁ , the output signal voltage V ₃ of the comparator 13 becomes high level, that is, V ₃ = Vb, but the analog switch SW is off and the voltage V ₄ of the capacitor C ₁ is This is not affected by V ₃ = Vb.
[0025]
Next, when the illuminance increases due to external factors or the like and V ₆ > V ₂ > V ₇ > V ₁ , the output of the second comparator D ₂ of the window comparator 18 becomes high level, and the output of the window comparator 18 becomes It becomes high level and the analog switch SW is turned on. At this time, since V ₂ > V ₁ , the output signal voltage V ₃ of the comparator 13 is at a high level, that is, V ₃ = Vb, and the voltage V ₄ of the capacitor C ₁ is Vb × [exp (− From t ₁ ÷ R ₈ C ₁ )] to Vb × [1-exp (−t ÷ R ₈ C ₁ )], the luminous flux of the light source is reduced.
[0026]
When V ₁ > V ₇ due to the decrease in the luminous flux of the light source, the analog switch SW is turned off, and the voltage V ₄ of the capacitor C ₁ is maintained until the current voltage becomes V ₁ > V ₆ . When the luminous flux of the light source further decreases and V ₁ > V ₆ , the analog switch SW is turned on, the voltage V ₄ of the capacitor C ₁ drops due to the discharge, and the luminous flux of the light source increases.
[0027]
As described above, when the illuminance detection signal voltage largely fluctuates, the voltage V ₄ of the capacitor C ₁ , that is, the output signal of the control signal generation circuit changes according to the fluctuation, and is applied to the light source according to the change of the output signal. The voltage changes, and the luminous flux of the light source changes according to the voltage change. When the illuminance detection signal voltage is between the first reference voltage and the second reference voltage, the illuminance detection signal voltage changes between them. However, the output signal of the control signal generation circuit does not change.
[0028]
Normally, when the illuminance detection signal voltage is located between the first reference voltage and the second reference voltage, the control signal is fixed at that time, and the illuminance does not fluctuate greatly. The light flux of the light source does not change according to the fluctuation.
[0029]
In this embodiment, the illuminance detection circuit is set so that the output signal voltage decreases as the amount of light increases. However, the output signal voltage may increase as the amount of light increases. The input terminal of the circuit may be reversed or an inverting amplifier.
[0030]
【The invention's effect】
As described above in detail, according to the present invention, when the illuminance detection signal voltage is located between the first reference voltage and the second reference voltage, the control signal is fixed at that time, and the illuminance does not vary greatly. Even if some fluctuation occurs, the luminous flux of the light source does not change according to the fluctuation. Therefore, flicker and periodic light and darkness due to a change in the luminous flux of the light source are reduced, and a stable and constant illuminance can be obtained. Also, by having the illuminance setting range adjustment circuit, it is possible to detect an abnormal state in which the illuminance detection signal level deviates from between the first and second reference signal levels for a predetermined time, and by displaying it, the illuminance setting signal is set. It is possible to easily know the value switching timing, light source replacement, and the like.
[Brief description of the drawings]
FIG. 1 is a diagram showing a control signal generation circuit of a constant output lighting control device according to an embodiment of the present invention.
2 is an operation explanatory diagram of the circuit in FIG.
FIG. 3 is a diagram showing a control signal generation circuit of a conventional constant output type lighting control device.
[Explanation of symbols]
11 Illuminance Detection Circuit 12 Illuminance Setting Circuit 13 Comparator 14 Time Constant Circuit 15 Impedance Conversion Circuit 16 Amplification Circuit 17 Illuminance Setting Range Adjustment Circuit 18 Window Comparator 19 Timer Circuit 20 Display Circuit

Claims (3)

A comparator for comparing the illuminance detection signal level with the illuminance setting signal level, a capacitor for charging / discharging according to the output of the comparator, a time constant circuit having a switch for controlling on / off of the charging / discharging, and the illuminance setting signal level The illuminance detection signal level is compared with each of a higher first reference signal level and a second reference signal level lower than the illuminance setting signal level, and the illuminance detection signal level is compared with the first reference signal level and the illuminance detection signal level. A constant output comprising a control signal generation circuit comprising a comparator for outputting a signal for controlling the switch to be turned off when it is between the second reference signal level and using the voltage of the capacitor as an output signal. Lighting control device. A comparator for comparing the illuminance detection signal level with the illuminance setting signal level, a capacitor for charging / discharging according to the output of the comparator, a time constant circuit having a switch for controlling on / off of the charging / discharging, and the illuminance setting signal level And an illuminance setting range adjustment circuit that divides the output of the amplifier and forms a first reference signal level that is higher than the illuminance setting signal level and a second reference signal level that is lower than the illuminance setting signal level. Each of the first reference signal level and the second reference signal level of the illuminance setting range adjustment circuit is compared with the illuminance detection signal level, and the illuminance detection signal level is compared with the first reference signal level and the second reference signal level. A comparator that outputs a signal for controlling the switch to turn off when it is between a reference signal level and the voltage of the capacitor Constant output lighting control apparatus characterized by comprising a control signal generating circuit to output signals. A first comparator for comparing an illuminance detection signal level with an illuminance setting signal level, a capacitor for charging / discharging according to an output of the comparator, a time constant circuit having a switch for controlling on / off of the charging / discharging, and the illuminance setting Each of the first reference signal level higher than the signal level and the second reference signal level lower than the illuminance setting signal level is compared with the illuminance detection signal level, and the illuminance detection signal level is compared with the first reference signal level. And the second reference signal level, the second comparator outputs a signal for controlling the switch to be turned off, and is connected to the second comparator, and the illuminance detection signal level is set to the first and first levels for a predetermined time. A display circuit that displays when the signal level is outside the two reference signal levels, and uses the voltage of the capacitor as an output signal. Constant output lighting control apparatus characterized by comprising a signal generating circuit.

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