JPH0329152B2 - - Google Patents

Description

[Detailed description of the invention]

[Technical Field of the Invention] The present invention relates to a photoelectric automatic blinking device that can set the illuminance at which the light is turned off to be lower than the illuminance at which the light is turned on. [Prior Art] Conventionally, in photoelectric automatic flashing devices, the illumination intensity when the lights are turned off is generally set higher than the illumination intensity when the lights are turned on. Therefore, unnecessary street lights may be left on for a long time even though there is sufficient brightness in the morning, which is uneconomical. Therefore, it is difficult to realize a photoelectric automatic flashing device in which the illuminance when the lights are turned off is equal to or lower than the illuminance when the lights are turned on. It has reached the point where it is requested. In order to solve this problem, in the photoelectric automatic flashing device, after turning on in the evening, after a predetermined delay time using a timer etc., the illuminance setting for turning off the light is set.
A method has been proposed in which the illuminance is reset to lower than the illuminance of the lighting (Utility Model Application Publication No. 58-98800). However, with this method, changes in outside light vary depending on the conditions of the day, and if various lighting conditions and installation locations are assumed, it is necessary to set a long delay time, and furthermore, it is necessary to ensure operational safety. Considering safety, it is difficult to set a standard for how much delay time should be used to guarantee safety, and these design problems tend to make the device itself expensive. There is. [Object of the Invention] The present invention has been made in order to eliminate the drawbacks of the conventional photoelectric flashing device described above. Switch each of the above illuminance setting means automatically,
To provide a photoelectric automatic blinking device that can reliably set the illumination intensity lower than the illuminance when turning off and turning on. [Summary of the Invention] The present invention provides operating illuminance setting means for high illuminance and low illuminance, sets the illuminance setting for low illuminance to turn off and set it lower than the illuminance for turning on high illuminance, and sets the external light illuminance to When the illuminance of external light falls below the set lighting illuminance, only the output of the operating illuminance setting means for low illuminance is enabled, and when the illuminance of outside light rises above the set lighting illuminance for high illuminance, the output of the operating illuminance setting means for high illuminance is enabled. The configuration is such that only the output is enabled, and the off illumination is reliably lower than the on illuminance to prevent unnecessary lighting in the morning. [Embodiments of the Invention] Next, embodiments of the photoelectric automatic flashing device according to the present invention will be described. First, an outline of an operation program for turning on or off a lighting load using the photoelectric automatic flashing device of the present invention will be explained based on FIG. Regarding the lighting program for lighting loads in the evening In the evening, turn off the illuminance A _-1 for example.
150 Lux, the lighting illuminance A _-2 is set to, for example, 80 Lux. By the operation of the operating illuminance setting circuit A for high illuminance, the external light changes to the lighting illuminance A _-2 at time T ₁ .
(80Lux), there is almost no delay time,
The lighting load is configured to immediately enter the lighting operation state. This is based on the idea that when it gets dark, it is safer to turn on the lights immediately. On the other hand, a certain delay time is provided until the light goes out. In other words, if the outside light illuminance due to stray light becomes equal to or higher than the lights-off illuminance A _-1 (150Lux) at time T ₂ , and this illuminance is continuously detected for a predetermined delay time T _d , the lights-off operation is performed for the first time at time T ₃ . It is configured so that Therefore, it is possible to prevent the lighting load from repeatedly turning on and off in the evening, and even if the lights turn off, at time T ₄ , the outside light will fall below the lighting illuminance A _-2 (80Lux) again. When this occurs, the lighting load is configured to immediately enter the lighting operation state. Further, the photoelectric automatic flashing device according to the present invention is uniquely equipped with an operating illuminance setting circuit B for low illuminance, which sets the illumination intensity B _-1 when turned off to 50 Lux, and the illumination intensity B _-2 when turned on to, for example, 20 Lux. However, this operating illuminance setting circuit B has a lighting illuminance of B _-2
If the following external light does not continue for a predetermined period of time, the operation illuminance setting circuit A is switched and does not operate effectively. Therefore, the outside light illuminance is the lighting illuminance A _-2 of the operating illuminance setting circuit A.
(80Lux), and even if operating illuminance setting circuit B turns off illuminance B _-1 (50Lux) is detected continuously for a predetermined period of time, this operating illuminance setting circuit B is not yet enabled and remains in operation. Since the illuminance setting circuit A is operating effectively, the lighting load maintains the lighting operation state. About the lighting load lighting program at night When the outside light illuminance further decreases and the illuminance below the lighting illuminance B _-2 (20 Lux) of the operating illuminance setting circuit B is detected at time T ₅ for a predetermined time T _d ,
The operating illuminance setting circuit B is enabled for the first time, while the operating illuminance setting circuit A is disabled, resulting in a complete nighttime state, and the illuminance load maintains the lighting operation. During the lighting operation at night, the system is designed to prevent malfunctions by setting a certain delay time in response to stray light from car headlights or searchlights, but for some special reason. Even if the device receives stray light for a long time that exceeds a predetermined delay time, it is configured to return to lighting operation as follows. That is, (a) Turn-off illuminance B _-1 of operating illuminance setting circuit B
(50 Lux) or more, turning off the operating illuminance setting circuit A. If stray light with an illuminance lower than the illuminance A _-1 (150 Lux) is received continuously for more than the predetermined delay time T _d , the lighting load will be turned off at time T ₆ . It enters operation, but the operating illuminance setting circuit does not switch, and the operating illuminance setting circuit B is still valid.
When the stray light disappears and the outside light illuminance falls again to the lighting illuminance B _-2 (20 Lux) at time T ₇ , this is detected and the lighting load is immediately returned to the lighting state. (b) On the other hand, the operating illuminance setting circuit A turns off illuminance A _-1
If stray light with an illuminance of (150 Lux) or more is received for more than a predetermined delay time T _d , the time
At _T8 , the operating illuminance setting circuit is switched as the light goes out, the operating illuminance setting circuit B is disabled, and the operating illuminance setting circuit A is enabled. Then, at time _T9 , when the stray light disappears and the outside light illuminance reaches the lighting illuminance A _-2 (80Lux), the lighting is configured to immediately return to the lighting state. Furthermore, the outside light illuminance decreases, and the lighting illuminance is B _-2.
(20 Lux) or less is detected for a predetermined delay time _Td , the operating illuminance setting circuit switches again at time _T10 , the operating illuminance setting circuit B becomes valid, and the lighting state of the lighting load is maintained. Ru. About the lighting load turn-off program in the morning As described above, the operating illuminance setting circuit B operates effectively from night to morning, and in the morning,
When it is detected at time _T11 that the outside light illuminance has exceeded the lights-off illuminance (50 Lux) for a predetermined delay time, the lighting load can be reliably turned off. Next, the external light changes to the operating illuminance setting circuit B's turn-off illuminance.
Even if the illuminance becomes even brighter than B _-1 (50Lux) and reaches the lighting illuminance A _-2 (80Lux) of operating illuminance setting circuit A, the operating illuminance setting circuit does not switch and the operating illuminance setting circuit B becomes effective. Since the lights are still operating, the light off operation is maintained and the outside light intensity increases further and the time changes.
Operation at T ₁₂ Illuminance setting circuit A turns off Illuminance A _-1
(150Lux), and when it becomes completely bright in the morning, the operating illuminance setting circuit switches, operating illuminance setting circuit A becomes valid, and operating illuminance setting circuit B becomes invalid, and therefore the light remains off thereafter. It is designed to return to the initial state similar to the lighting load lighting program in the evening while maintaining operation. The operation program described above repeatedly turns on and off the lighting load from evening to morning.As can be seen from this program, in the present invention, the operating illuminance setting circuit is automatically turned on and off at night according to the outside light illuminance. Therefore, the illuminance when the lights are turned off can be easily and reliably set to be lower than the illumination when the lights are on. Next, the configuration of a photoelectric automatic blinking device for implementing the above operating program will be described. FIG. 2 is a block diagram showing one example. In FIG. 2, 1 is a commercial frequency AC power source, and 2 is a constant voltage circuit connected to the AC power source, which serves as a power source for the control circuit. 3 is an operating illuminance setting circuit A for high illuminance (unlit illuminance and on illuminance) and an operating illuminance setting circuit B for low illuminance, and the illuminance detection circuit 3
_-1 , Delay timer circuit 3 _-2 , Insertion/removal switching circuit 3 for enabling or disabling the operation of the delay timer circuit 3 _-3 , Voltage detection circuit for setting lighting illuminance for high and low illuminance 3 _-4 , For high illuminance Operating illuminance ratio (unlit illuminance A _-1 / lit illuminance A _-2 ) setting circuit 3 _-5 , operating illuminance ratio for low illuminance (unlit illuminance B _-1 / lit illuminance B _-2 ) setting circuit 3 _-6
It consists of Reference numeral 4 designates a logic judgment circuit, which is comprised of a coincidence circuit _4-1 , a clock pulse generation circuit _4-2 , a D-type flip-flop circuit _4-3 , and _{an OR circuit 4-4 .} The output is valid until the external light illuminance corresponding to the lighting illuminance _{B -2 of} the operating illuminance ratio setting circuit _3-6 for low illuminance is detected. The operating illuminance ratio setting circuit for high illuminance is valid until the detection of external light illuminance corresponding to the off illuminance A _-1 of 3 _-5 , and the lighting operation output is set at the on illuminance A _-2 of operating illuminance ratio setting circuit 3 _-5 for high illuminance. , the operation illuminance setting circuit _3-6 for low illuminance is configured to generate a lights-out operation output at the lights-out illuminance B _-1 . 5 is a lighting load 6 based on the output of the logic circuit 4.
This is an output drive circuit for turning on and off the light. Next, a specific example of the circuit configuration of the photoelectric automatic blinking device shown in the block diagram of FIG. 2 will be explained based on FIG. 3. A surge absorber SA for absorbing surge voltage is connected in parallel to the commercial frequency (50/60Hz) AC power supply 1. A constant voltage circuit 2 forming a DC voltage power supply for the control circuit is connected to one line of the AC power supply 1.
Resistor R ₁₃ and diode D ₁ connected in series with l ₁ ,
One diode _D2-1 in the rectifier bridge circuit Br connected to the other line _l2 of the AC power source 1, the resistor _R13 , the diode _D1, and the diode
It consists of a Zener diode ZD and a smoothing capacitor C ₁ which are each connected in parallel to the AC power supply 1 via D _2-1 . Note that P ₁ and P ₀ are output terminals of the constant voltage circuit 2. The illuminance detection circuit _3-1 of the operating illuminance (unlit illuminance/on illuminance) setting circuit 3 is connected in series with each other, and the sensitivity adjustment resistor _R1 and photoconductive resistor are connected in parallel to the constant voltage power supply terminals _P1 and _P0 . It is composed of cell CdS. Delay timer circuit 3 _-2 is the illuminance detection circuit 3
_-1 resistor R ₁ and a resistor R ₂ connected to the connection point of the photoconductive cell CdS, and a capacitor C ₂ connected in parallel to the resistor R ₂ and the photoconductive cell CdS. The insertion/removal switching circuit _3-3 for enabling or disabling the operation of the delay timer circuit _3-2 is composed of a photocoupler PC consisting of a light emitting diode LED and a phototransistor _TP , and resistors R ₃ and R ₄ . A series connection circuit of the light emitting diode LED of the photocoupler PC and the resistor _R4 is connected to the constant voltage power supply terminal _P1 and the output c of the logic circuit 4, and the resistor
The series connection circuit of R ₃ and the phototransistor T _P of the photocoupler PC is the resistor of the delay timer circuit 3 _-2 .
Connected in parallel to R ₂ . The voltage detection circuit 3 _-4 for setting the lighting illuminance A _-2 , B _-2 for high illuminance and low illuminance consists of a field effect transistor FET and resistors R ₅ , R ₆ connected to the source S of the FET. The drain D of the field effect transistor FET is connected to the terminal _P1 of the constant voltage power supply. Operating illuminance ratio for high illuminance (illuminance off/illuminance on)
Setting circuit _3-5 includes two inverters INV ₁ and INV ₂ connected in series, a resistor R 8 connected in parallel to the inverters INV ₁ and INV ₂ , and a resistor R ₈ connected in series to these series-parallel circuits. It consists of a Schmitt trigger circuit formed by a resistor R ₇ and a malfunction prevention capacitor C ₃ connected between the two inverters INV ₁ and INV ₂ of the Schmitt trigger circuit and the constant voltage power supply terminal P ₀ . ing. And the input signal is
Field effect transistor of the voltage detection circuit _3-4
Supplied from the connection point of FET source S and resistor _R5 ,
Its output A is connected to one of the input terminals of the logic circuit 4. Operating illuminance ratio for low illuminance (unlit illuminance/lit illuminance)
The setting circuit _3-6 is composed of a Schmitt trigger circuit also consisting of resistors R ₉ and R ₁₀ and two inverters INV ₃ and INV ₄ , and a malfunction prevention capacitor C ₄ , and the input signal is sent to the voltage detection circuit 3. _-4 is supplied from the connection point of resistor R ₅ and resistor R ₆ at output B
is connected to the other input terminal of the logic circuit 4. The malfunction prevention capacitors C ₃ and C ₄ in the operating illuminance ratio setting circuits 3 _-5 and 3 _-6 are used to stabilize the input and output levels of the ICs that make up the inverter, thereby stabilizing the operation. . The logic determination circuit 4 uses the outputs A and B of the operating illuminance setting circuit 3 as input signals to generate a final output c that turns on or off the lighting load 6 for each external light illuminance condition.
Each circuit is configured as follows. The matching circuit _4-1 is an exclusive OR circuit that receives as input the output A of the operating illuminance ratio setting circuit _3-5 for high illuminance and the output B of the operating illuminance ratio setting circuit _3-6 for low illuminance.
EOR ₁ and the inverter connected to its output side
INV ₅ , the output of which is connected to the preset terminal PR of the D-type flip-flop _4-3 .
Clock pulse generation circuit 4 _-2 is one input terminal
The output A of the high illuminance operating illuminance ratio setting circuit _3-5 is connected to _I1 , and the other input terminal _I2 is the output terminal of an integrating circuit consisting of a resistor _R11 and a capacitor _C5 connected to the above output A. Exclusive OR circuit EOR ₂ connected to
and a delay circuit consisting of a resistor R ₁₂ and a capacitor C ₆ connected to the output terminal O ₁ of the exclusive OR circuit EOR ₂ , and the output terminal O 1 of the exclusive OR circuit EOR ₂ is connected to the output terminal O ₁ of the exclusive OR circuit EOR 2. It is connected to the clock terminal CP of the D-type flip-flop _4-3 through the connection point between the resistor _R12 of the delay circuit and the capacitor _C6 , and the other end of the resistor _R12 constituting the delay circuit is a constant voltage power supply terminal. The other ends of capacitors C ₅ and C ₆ are connected to constant _voltage power supply terminal P ₀ . In the D-type flip-flop _4-3 , one negative terminal _P0 of the constant voltage power supply is connected to the clear reset terminal CL and data terminal D, and the logic value is always L, and the output is the logic value of the OR circuit _4-4 . It is connected to one input terminal a. The output B of the operating illuminance setting circuit 3 is connected to the other input b of the OR circuit _4-4 , and the output c of the OR circuit _4-4 is connected to the output B of the delay timer insertion/removal switching circuit _3-3 . The other end of the resistor _R4 is connected to the input terminal of the lighting load turning on/off drive circuit 5, respectively. Note that S ₁ is the output terminal of the OR circuit 4. The lighting load turning on/off drive circuit 5 consists of diodes D _2-1 , D _2-2 , D _2-3 , D _2-4 , and the AC power supply 1 is connected to the connection point of the diodes D _2-1 and D _2-3 . A diode bridge B _r is connected to one line l ₂ of the diodes D _2-1 and D _{2-2 and the connection point of the diodes D 2-1 and D 2-2} is connected to one terminal P ₀ of the constant voltage circuit 2, and the output of the logic circuit 4. Series resistors R ₁₄ and R ₁₅ for adjusting the gate voltage of the thyristor T _h are connected between the terminal S ₁ and the connection point of the diodes D _2-1 and D _2-2 of the diode bridge B _r .
and the diode of said diode bridge B _r
Connect the cathode to the connection point of D _2-1 and D _2-2 , the anode to the connection point of diodes D _2-3 and D _2-4 , and connect the gate to the connection point of the resistors R ₁₄ and R ₁₅ . The main electrode is connected between the thyristor T _h and one terminal of the lighting load 6 and one line l ₂ of the power supply 1, and the gate is connected to the connection point of the diodes D _2-2 and D _2-4 . Triax for turning on/off the load
TR, a gate resistor R ₁₆ connected between one main electrode and the gate of the triax TR, a resistor R ₁₇ for preventing malfunction of the triax connected in parallel between the main electrodes of the triax TR, and a capacitor C ₇ connected in series. It consists of a circuit. Next, the operation of a specific circuit configuration example of the photoelectric automatic flashing device configured as described above will be explained. First, the setting of the resistance value of each resistor in the operating illuminance setting circuit 3 will be explained. Illuminance detection circuit _3-1 utilizes the fact that the resistance value of the photoconductive cell CdS becomes lower (higher) when the outside light becomes brighter (darker). Field effect transistor of voltage detection circuit 3 _-4 based on the resistance value of photoconductive cell CdS when receiving external light of A _-2 (e.g. 80 Lux)
The voltage V _A between the FET source and constant voltage power supply terminal P ₀ is
This is the input voltage for the operating illuminance ratio setting circuit _3-5 for high illuminance. Then, the resistance value of the sensitivity adjustment resistor _R1 is set so that the input voltage exceeds the threshold voltage of the shot trigger circuit of the operating illuminance ratio setting circuit _3-5 and the output A becomes the logical value H. Ru. Since the output c (logical value) of the logic circuit 4 is L during the light-off operation, the switching circuit 3 of the delay timer circuit 3 _-2
-3 photocoupler PC is turned on. At this time, resistance
The resistance value of _R3 is set to be extremely smaller than that of resistor _R2 , and the delay timer circuit _3-2 is disabled to prevent it from operating. On the other hand, during lighting operation, the output c of the logic circuit 4 becomes H, and the photocoupler PC
Since it is turned OFF, the delay timer circuit _3-2 comes to operate effectively. Furthermore, the operating illuminance is determined by the voltage V _A between the source S of the field effect transistor FET of the voltage detection circuit _3-4 and the constant voltage power supply terminal _P0 when receiving external light with the illumination intensity being off illuminance A _-1 (150 Lux). The resistors _R7 and _R8 are set so that the output A of the Schmitt trigger circuit of the ratio setting circuit _3-5 has a logical value L. In addition, when the photoconductive cell CdS receives external light whose illuminance is lighting illuminance B _-2 (20Lux), the voltage detection circuit 3
The voltage V A between the source S of the field effect transistor FET of _-4 and the constant voltage power supply terminal P ₀ is expressed as the voltage V _A between the resistor R ₅ and the resistor R _6.
The voltage V _B across the resistor R ₆ divided by and becomes the input voltage of the Schmitt trigger circuit of the operating illuminance ratio setting circuit _3-6 for low illuminance, and the output B becomes the logic value H at that input voltage V _B. so that resistor R ₅ and resistor R ₆
is set. Furthermore, the photoconductive cell CdS is turned off at illuminance B _-1 (50Lux)
When external light is received, the voltage V _A between the source S of the field effect transistor FET of the voltage detection circuit _3-4 and the constant voltage power supply terminal _P0 is divided by the resistor _R5 and the resistor _R6 . The resistor R9 and the resistor _R10 are set so that the output _B of the Schmitt trigger circuit of the operating illuminance ratio setting circuit _3-6 becomes the logical value L at the voltage VB between both ends _of the resistor _R9 and the resistor R10. Next, in the photoelectric automatic flashing device in which the resistance values of the respective resistors in the operating illuminance setting circuit 3 are set in this manner, the operation when the external light illuminance changes will be described. First, the respective outputs A and B of the operating illuminance ratio setting circuits 3 _-5 and 3 _-6 will be explained. Outdoor light illuminance is lighting illuminance
When A _-2 (80Lux) or lower, the output A of the operating illuminance ratio setting circuit 3 _-5 for high illuminance becomes H, and then the outside light illuminance increases until the illuminance reaches A _-1 (150Lux) or higher. When the detection is continued for a predetermined delay time (T _d ), the output A becomes a logical value L. The outside light decreases from lighting illuminance A _-2 (80Lux),
When the illuminance below the lighting illuminance B _-2 (20 Lux) is detected continuously for a predetermined delay time, the output B of the operating illuminance ratio setting circuit 3 _-6 becomes a logic value H, and then the illuminance turns off.
When an illuminance of B _-1 (50 Lux) or more is detected continuously for a predetermined delay time, the output B of the operating illuminance ratio setting circuit 3 _-6 becomes a logical value L. Table 1 shows data of operation examples for external light of various illuminances. However, this is when the constant voltage power supply is 6V.

[Table] Next, the operation of the logic circuit 4 in response to the outputs A and B of the operating illuminance setting circuit 3 will be described. Matching circuit _4-1 outputs H only when both inputs are H or L, and is an exclusive OR circuit.
It is composed of EOR ₁ and inverter INV ₅ connected to its output. Therefore, when the outputs A and B of the operating illuminance setting circuit 3, which is its input, are both H or L, this matching circuit 4 _-1 output is H
Then, D to which the output of matching circuit 4 _-1 is connected
The preset terminal PR of the flip-flop type _4-3 also becomes H. Therefore, the flip-flop 4 _-3
The output of and one input a of the OR circuit _4-4 are always L. In order for the clock pulse generating circuit _4-2 to operate effectively, the output of the matching circuit _4-1 , that is, the preset terminal PR of the D-type flip-flop _4-3 , must become L. That is, the clock pulse from the clock pulse generation circuit _4-2 is outputted from the output A of the operating illuminance setting circuit 3.
When changes from L to H, resistor _R11 and capacitor
Integrator circuit consisting of C ₅ and exclusive OR circuit EOR ₂
However, the clock pulse is generated when the output A of the operating illuminance setting circuit 3 changes from L to H, and the output B
Based on the state that holds L, the preset terminal PR of the D-type flip-flop _4-3 becomes L, and is then delayed by a delay circuit consisting of resistor _R12 and capacitor _C6 to reach the clock terminal CP. Since the signal is transmitted, the output of the D-type flip-flop _4-3 , that is, one input a of the OR circuit _4-4 , can be reliably changed from L to H. In the OR circuit _4-4 , when either the input a or the input b is H, the output c becomes H and becomes a lighting output. Based on the lighting output of this logic circuit 4, the thyristor T _h of the lighting load turning on/off drive circuit 5 is
As a result, the triac TR is also turned on, and the lighting load 6 is brought into a lighting output state. Also,
The photocoupler PC of the delay timer circuit switching circuit _3-3 is turned off by the lighting output of the logic circuit 4, and the delay timer circuit _3-2 is effectively operated to provide a predetermined delay time for the next light-off operation. Further, when both the input a and the input b of the OR circuit _4-4 are L, the output c becomes L and becomes a light-off output. This light-off output turns off the thyristor T _h and triax TR of the lighting load on/off drive circuit 5, turns off the lighting load 6, and at the same time puts the delay timer circuit _3-2 in an inactive state, causing the next immediate lighting. Be prepared for. Table 2 shows each input/output logic value of the logic determination circuit 4 for external light (IL) of various illuminances.
However, illuminance when turned off A _-1 : 150Lux, illuminance turned on A _-2 :
80Lux, off illuminance B _-1 : 50Lux, on illuminance B _-2 :
20 Lux. In the table, PR and CP indicate inputs to the clock terminal and preset terminal of the D-type flip-flop.

【table】

[Table] Next, a specific flashing operation program for the lighting load based on the logical values shown in Table 2 above will be explained. Evening lighting load lighting program When the outside light illuminance changes from the states (1) and (2) in Table 2 to the state (3) (50<IL≦80), the output c of the logic circuit 4 becomes H and the light is turned on. It becomes action. Also, the external light illuminance changes from this (3) state to (1) state (IL≧150).
When this state is maintained for a certain delay time, the output c of the logic circuit 4 becomes L, and the light goes out. However, after this light-off operation, when the outside light illuminance returns to state (3) again, the output c is L, so the delay timer circuit _3-2 does not operate, and the light-on operation immediately starts. Then, the outside light illuminance decreases, (4)
Even in the state (20<IL≦50), the output c remains at H and the lighting operation is maintained, and the operating illuminance setting circuit A for high illuminance operates effectively. Lighting load lighting program at night As night falls, the brightness of outside light decreases further.
When the state (5) is reached (0≦IL≦20), the output B of the operating illuminance setting circuit 3 becomes H and the input a becomes L, but the input b becomes H and the output c becomes H.
The lighting operation is maintained, and the operating illuminance setting circuit B for low illuminance operates effectively. Due to stray light, the external light illuminance is (7) or (8) (50
≦IL<80 or 80≦IL<150) continues for the specified delay time, input a remains low and input b becomes low, so the light turns off, but the stray light disappears and the light is turned off again. Light illuminance is (5) (0≦IL
≦20), the output B becomes H and the lighting operation starts immediately. Furthermore, if the outside light illuminance continues to be in state (1) or (9) (IL≧150) for a predetermined delay time due to stray light,
Outputs A and B are both L, and inputs a and b are also both L, so the light goes out and the operating illuminance setting circuit A becomes effective, but the stray light disappears and the outside light illuminance is again in the state (3) (50 < When IL≦80),
Input a becomes H and the lighting starts immediately, and the external light illuminance goes through state (4) and then reaches state (5) (0≦IL
≦20), the operating illuminance setting circuit B is activated again.
is enabled, and in this state the lighting operation will be maintained at night. Lighting load turn-off program in the morning After the external light illuminance reaches state (6) (20<IL<50)
When the state (7) (50≦IL<80) continues for the predetermined delay time, no clock pulse is generated and input a remains L, but input b becomes L, so output c becomes L and the light goes out. It becomes action. Therefore, the light can be reliably turned off at an outside light illuminance lower than the lighting illuminance in the evening. Furthermore, the external light illuminance is (8) (80≦IL＜150)
When the condition (9) (IL≧150) is reached after
The output A becomes L while the input a remains at L, and the operating illuminance setting circuit A becomes effective. Therefore, the external light illuminance becomes equal to the state (1), and the program returns to the initial state of the illumination load lighting program in the evening. In the above specific circuit configuration example, a cadmium sulfide cell is used as the photoconductive cell in the illuminance detection circuit 3 _-1 of the operating illuminance setting circuit 3, but other light receiving elements such as phototransistors may be used. Can be done. Note that as for the field effect transistor FET of the voltage detection circuit _3-4 of the setting circuit 3, a transistor with high h _FE may be used instead of the FET. However, since the total impedance of the illuminance detection circuit, delay timer circuit, and operating illuminance ratio setting circuit is small, adjustment becomes extremely difficult when using transistors with small input impedance.
The use of field effect transistors is the most stable and effective. In addition, the exclusive OR circuit in the logic circuit 4
EOR ₁ is as shown in Figure 4 A or B.
The same operation can be performed by a circuit configured by combining a NAND circuit, an OR circuit, and an AND circuit, or a circuit configured by combining four NAND circuits. Similarly, the exclusive OR circuit of clock pulse generation circuit _4-2
EOR ₂ is a NOR with an inverter INV connected to one input terminal _I1 as shown in Figure 5A or B.
circuit, or an AND circuit with an inverter INV connected to the other input I ₂ can be used instead. Further, the OR circuit _4-4 of the logic circuit 4 can be replaced with an exclusive OR circuit, and the same lighting/extinguishing operation can be performed. (Effects of the Invention) As described above in detail based on the embodiments, according to the present invention, each output of the on/off illuminance setting means for high illuminance and low illuminance is automatically switched according to the external light illuminance. Therefore, the illuminance when the lights are turned off can be reliably set to be lower than the illuminance when the lights are turned on, regardless of changes in external conditions.

[Brief explanation of drawings]

FIG. 1 is a diagram showing a lighting load turning on/off operation program by a photoelectric automatic flashing device according to the present invention, FIG. 2 is a block diagram of an embodiment of the present invention, and FIG. Figures 4A and 4B are diagrams showing an example of the circuit configuration of each block shown in the figure, and Figure 5A is a diagram showing another equivalent circuit of the exclusive OR circuit EOR ₁ shown in Figure 3. , B are diagrams showing other equivalent circuits of the exclusive OR circuit EOR ₂ shown in FIG. 3. In the figure, 1 is an AC power supply, 2 is a constant voltage circuit,
3 is the operating illuminance setting circuit, 3 _-1 is the illuminance detection circuit, 3
_-2 is a delay timer circuit, 3 _-3 is a delay timer switching circuit, 3 _-4 is a voltage detection circuit for lighting illuminance setting, 3 _-5
is an operating illuminance ratio setting circuit for high illuminance, 3 _-6 is an operating illuminance ratio setting circuit for low illuminance, 4 is a logic judgment circuit, 4
_-1 is a coincidence circuit, 4 _-2 is a clock pulse generation circuit,
_4-3 is a D-type flip-flop, and _4-4 is an OR circuit.

Claims (1)

[Claims] 1. Illuminance detection means for detecting changes in the illuminance of external light;
a high illuminance on/off illuminance setting unit that outputs an output signal when the unlit illuminance is set higher than the on illuminance and the illuminance detected by the illuminance detection means becomes less than the set on illuminance, and the unlit illuminance is turned on. For low illuminance, the illuminance is set higher than the illuminance and lower than the lighting illuminance of the turning on/off illuminance setting means for high illuminance, and outputs an output signal when the illuminance detected by the illuminance detecting means falls below the set lighting illuminance. lighting/
When the illuminance detected by the lights-off illuminance setting means and the illuminance detecting means is lower than the lighting illuminance of the turning-on/turn-off illuminance setting means for low illuminance, the turning-on/turn-off illuminance setting means for high illuminance is disabled and the illuminance for low illuminance is set. Only the output signal of the on/off illuminance setting means is enabled, and when the illuminance rises above the off illuminance of the on/off illuminance setting means for high illuminance, the on/off illuminance setting means for low illuminance is disabled and the high illuminance is turned off. logical determination means for validating only the output signal of the on/off illuminance setting means;
1. A photoelectric automatic flashing device comprising: lighting load flashing drive means controlled by the output of the logical determination means. 2. A delay means is connected to the external light illuminance detection means, and the delay means is configured to operate effectively when the lighting load is turned on and to be disabled when the lighting load is turned off, according to the output signal of the logic judgment means. According to claim 1, the switching control is performed so that when the lighting operation starts, the lighting operation is performed immediately, and when the lighting operation starts, the lighting operation is performed after a predetermined delay time has elapsed. Photoelectric automatic flashing device.