JPH0256765B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to a photoelectric automatic flasher that automatically turns on a lighting load when ambient illuminance decreases.

[Background technology]

FIG. 1 shows a circuit example of a conventional photoelectric automatic flasher. As shown in the figure, an EE switch 3, which is a photoelectric automatic flasher, and an operation switch 4 are connected between the AC power source 1 and the lighting load 2.
The EE switch 3 is composed of a CdS 5, a heater 6, and a bimetal switch 7. When the surrounding area becomes bright, the resistance value of the CdS 5 decreases, so the heater 6 is heated and the bimetal switch 7 is turned off. When the reaction occurs and the surrounding area becomes dark, the resistance value of the CdS 5 increases, so the temperature of the heater 6 decreases and the bimetal switch 7 is turned on. The operation switch 4 can be switched to three contacts a, b, and c, and at the contact a position, the lighting load 2 is automatically turned on and off by the EE switch 3, and at the contact b position, the lighting load 2 is turned off. The light is turned on at the position of contact c. Figure 2 shows a circuit diagram of another conventional example,
Lighting load 2 that closes only contact d of operation switch 4
is automatically flashed by the EE switch 3, the lighting load 2 is turned on when only the contacts are closed, and the lighting load 2 is turned off when both contacts d and e are opened.

However, in the case of FIG.
If you leave it switched to contact b position,
Even if the surroundings become dark, the lighting load 2 cannot be turned on. Further, in the case of FIG. 2, a similar problem occurs when both contacts d and e are left open. Furthermore, if the operating switch 4 is left in the position of contact c in FIG.
In the case of FIG. 2, a similar problem occurs if contact e is kept closed.

Moreover, in the case of FIGS. 1 and 2, in addition to the wiring that connects the operating switch 4, the EE switch 3, and the power source 1, a separate wiring K that connects the operating switch 4 and the power source 1 is required. However, there was also the problem that wiring construction was troublesome.

[Object of the Invention] The present invention has been made in view of the above-mentioned points, and its purpose is to enable the lighting load to be turned on and off manually, and to prevent the external light level from being lower than a predetermined level. Automatically turns on the lighting load whenever it gets dark or bright.
The purpose of the present invention is to provide a photoelectric automatic flashing device that can be turned off and that can be easily installed by reducing the number of wires.

[Disclosure of the invention]

Embodiment An embodiment of the present invention is shown in FIGS. 3 to 5.
In this embodiment, as shown in FIG. 3, a normally closed operation switch 9 that opens only when pressed and a lighting load 2 are connected in series to a power source 1, and a power source 1 to the lighting load 2 is connected in series with the lighting load 2.
a load on/off control circuit 14 that controls the supply of light to turn on and off the lighting load 2; and a voltage fluctuation detection circuit that detects that the operating switch 9 is opened from voltage fluctuations at the non-power supply terminal of the operating switch 9. 10 and
An operation output inversion circuit 11 that alternately inverts the output state between high and low levels every time the detection output of the voltage fluctuation detection circuit 10 is generated; a light receiving section 12 that detects external light; When the external light level exceeds a predetermined level, the load on/off control circuit 14 is controlled to turn off the lighting load 2, and while the external light level exceeds a predetermined level, it is related to the output of the voltage fluctuation detection circuit 10. The output inversion circuit 11 is operated to an output state that holds the lighting load 2 off without
and controls the load on/off control circuit 14 to turn on the lighting load 2 when the external light level detected by the light receiving section 12 falls below a predetermined level, and also controls the load on/off control circuit 14 to turn on the lighting load 2 when the external light level detected by the light receiving section 12 falls below a predetermined level. An on/off operation output setting circuit 13 is provided which controls a load on/off control circuit 14 in accordance with the output of the operation output inverting circuit 11 to turn on and off the lighting load 2 for a certain period of time.

The voltage fluctuation detection circuit 10 is designed to generate a detection output when the detected voltage drops to a predetermined level with a delay due to a time constant from when the operating switch 9 is turned off, and also generates a detection output instantaneously due to the time constant. Changes in the input voltage are not detected. The operation output inversion circuit 11 has a function as a binary counter like a flip-flop, and generates an on signal of "H" level and an "L" level every time the detection output of the voltage fluctuation detection circuit 10 is input.
The level off signal is sequentially inverted and output. The light receiving section 12 detects external light, and outputs a photoelectric output that is inversely proportional to the external light level.
The output signals are outputted to an OFF operation output set circuit 13, respectively. On/off operation output set circuit 1
3, when the external light level detected by the light receiving unit 12 exceeds a predetermined level (L ₂ shown in FIG. 4a),
The load on/off control circuit 14 is controlled to turn off the lighting load 2, and the load is turned on when the external light level detected by the light receiving section 12 falls below a predetermined level (L ₁ in Fig. 4a).・Off control circuit 14
is controlled to turn on the lighting load 2. In addition, this on/off operation output setting circuit 13 keeps the lighting load ₂ off regardless of the output of the voltage fluctuation detection circuit 10 until the external light level exceeds L2 and then decreases to _L1 again. The operation output inverting circuit 11 is controlled to the output state (that is, the output is set to the "H" level). Therefore, the load on/off control circuit 14 operates during the period when the photoelectric output exceeds a predetermined level, that is, when the external light level drops to _L1 and recovers to _L2 , and the operation output inverting circuit 11 When the output of is at "H" level, the lighting load 2 is turned on.

FIG. 4 shows a time chart of each part of the same as above, and the operation of the photoelectric automatic blinker of the present invention will be explained based on this time chart. Now, when the output of the operation output inverting circuit 11 shown in FIG. 4g is at the "H" level and the external light level shown in FIG. 4a falls to _L1 , the photoelectric output shown in FIG. At this time, the on/off operation output setting circuit 13 controls the load on/off control circuit 14 to supply the power source 1 to the lighting load 2. Therefore, at this time, the lighting load 2 is lit. FIG. 4c is a time chart showing the load operation. By the way, if the operating switch 9 is operated as shown in FIG. 4d until the photoelectric output exceeds a predetermined level, the detection input of the voltage fluctuation detection circuit 10 shown in FIG. 4e changes from V ₁ to V ₂ after t time. The detection output decreases and a detection output is generated, but
As mentioned above, the on/off operation output set circuit 13
In order to maintain the set state of the manipulated output inverting circuit 14, the output of the manipulated output inverting circuit 11 shown in FIG. 4g remains at the "H" level and does not change. In other words, the operation of the operation switch 9 before the automatic lighting becomes invalid. Incidentally, FIG. 4f is a time chart showing the output of the on/off operation output setting circuit 13.

Now, when the operation switch 9 is operated as described above, the voltage fluctuation detection circuit 10 detects this operation due to a drop in the input voltage and generates a detection output, but when the photoelectric output exceeds a predetermined level, In other words, when the external light level falls below _L1 , the output of the on/off operation output setting circuit 13 becomes "L" and the operation output reversing circuit 11 is released from the set state, so that the lighting load 2 lights up as described above. When the operation switch 9 is operated after that, the operation output inverting circuit 11 is
inverts its output from "H" level to "L" level. By the way, as shown above, the external light level is L ₁
Until L ₂ is exceeded again, the on/off operation output setting circuit 13 controls the load on/off control circuit 14 according to the output of the operation output inversion circuit 11 to turn on the lighting load 2. , the lighting load 2 is turned off. Thereafter, each time the operation switch 9 is operated, the operation output reversing circuit 11 sequentially inverts the output to turn the lighting load 2 on or off. Now, the external light level is L ₂
When the photoelectric output is restored to 1, that is, when the photoelectric output decreases, the on/off operation output setting circuit 13 controls the load on/off control circuit 14 to turn on the lighting load 2. Now, when the external light level reaches _L2 and the photoelectric output decreases, this decrease causes the on/off operation output set circuit 13 to set the output to "H" level and force the output of the operation output inversion circuit 11 to the previous level. It is set to the "H" level regardless of the output level. In other words, the outside light level is again
Load on/off control circuit 14 when the voltage drops to L ₁
The setting is made so that the lighting load 2 can be turned on. Now, even if the operation switch 9 is operated before the external light level falls to _L1 again, the operation input to the operation switch 9 will be invalidated as described above, and the load on/off control circuit 14 will maintain the off state. It is possible.

FIG _. 5 shows a specific circuit example corresponding to the circuit in _{FIG .}
Consisting of a capacitor C ₁ , resistors R ₁ , R ₄ , R ₅ , R ₈ and a transistor Q ₁ , when the voltage charged to the capacitor C ₁ via diodes D ₁ and R ₁ falls below a certain level, it becomes H level. This produces an output of That is, when the push button type normally closed operation switch 9 is turned off, the resistor 8 is connected in series with the resistor _R1 , so the voltage charged in the capacitor _C1 becomes lower than when the operation switch 9 is on. At this time, select the circuit constants so that the Zener diode ZD ₁ is turned off and the transistor Q ₁ is also turned off.
On the other hand, the circuit constants are selected so that when the operating switch 9 is on, the Zener diode _ZD1 is on and the transistor _Q1 is also on.
The operation output inversion circuit 11 is a JK flip-flop,
It consists of an inverter I ₁ and resistors R ₉ and R ₁₁ , and the output of the voltage fluctuation detection circuit 10 is inputted to the clock input CP of the JK flip-flop via the inverter I ₁ . In addition, the J input and K input are resistors R ₉ ,
Both are set to H level via R ₁₁ , so every time the operation switch 9 is turned off and a detection output is generated from the voltage fluctuation detection circuit 10, the JK
The Q output of the flip-flop is inverted. The light receiving section 12 is a phototransistor.
It consists of PH, Zener diode ZD ₂ , capacitor C ₃ , variable resistor VR and resistor R ₁₂ . here,
The capacitor _C3 is charged with a constant voltage determined by the Zener voltage of the Zener diode _ZD2 , and this voltage is connected to the resistor _R12 and the variable resistor VR.
The signal is applied to the phototransistor PH of the light receiving section 12 via. Phototransistor PH
has a low resistance when the external light level is high, and a high resistance when the external light level is low. Therefore, when the external light level is high, the output level of the light receiving section 12 is low, and when the external light level is low, the output level of the light receiving section 12 is high. on·
The off operation output set circuit 13 includes an inverter I ₂ ,
I ₃ , NAND gate N ₁ , capacitor C ₄ and resistor
Consists of R ₁₀ and R ₁₃ . Here, the circuit section consisting of the inverters I ₂ and I ₃ and the resistor R ₁₀ compares whether the detection level in the light receiving section 12 is higher or lower than a predetermined threshold level.
Since _R10 is connected, a hysteresis characteristic occurs in the detection level.

Further, an integrating circuit consisting of a resistor R ₁₃ and a capacitor C ₁₄ is provided to ignore instantaneous fluctuations in the photoelectric output of the light receiving section 12. Note that the load on/off control circuit 14 includes thyristors T, SCR,
It consists of a transistor Q ₂ , a diode bridge DB, a capacitor C ₂ , and resistors R ₂ , R ₆ , and R ₇ . However, in the daytime when the external light level is high, the output level of the light receiving section 12 is low, so the output of the inverter _I2 is at the H level, and therefore the Q output of the operation output inverting circuit 11 is set at the H level. . By the way, since the output of inverter _I3 is at L level at this time, the output of NAND gate _N1 is at H level. On the other hand, as the external light level decreases, the inverter
When the output of _I3 becomes H level, NAND gate _N1
The output becomes L level. At this time, the base potential of transistor _Q2 decreases via resistor _R6 , so
Transistor _Q2 is turned off. Then, the capacitor _C2 is charged through the resistor _R3 , so the thyristor SCR is turned on, and a voltage is generated across the resistor _R2 due to the current flowing through the diode bridge DB and the resistor _R7 . This turns on the bidirectional thyristor T and turns on the lighting load 2.
Next, when the operation switch 9 is turned off in this state, the detection output of the voltage fluctuation detection circuit 10 goes to H level, so the base potential of the transistor Q ₂ rises through the diode D ₂ and the resistor R ₆ , and the transistor Q ₂ is turned on, thyristor SCR and thyristor T are both turned off, and the lighting load 2 is turned off. In addition, the Q output of the operation output inversion circuit 11 is inverted to L level by the detection output of the voltage fluctuation detection circuit 10, so the output of the NAND gate _N1 becomes H level, and therefore the operation switch 9 is turned on again. Also, lighting load 2 remains off. Note that the diode D ₂ is provided here to operate the load on/off control circuit 14 as quickly as possible when the operation switch 9 is operated, but it is not necessarily necessary if delay in operation is not a problem. Not. Next, when the operation switch 9 is turned off again in this state, the voltage fluctuation detection circuit 10 is turned off again.
Since the Q output of the operation output inverting circuit 11 is inverted to L level by the detection output of , the lighting load 2 is lit when the operation switch 9 is turned on again.
Therefore, each time the operating switch 9 is operated, the lighting load 2 can be turned on or off. However, when morning comes with the lighting load 2 turned on, the inverter is
Since the output of _I3 becomes L level, the NAND gate
Since the output of N ₁ is always at H level, lighting load 2
goes out. In addition, when morning comes with the lighting load 2 turned off, the output of the inverter I ₂ becomes H when the light reception level of the light receiving section 12 becomes high enough.
At this time, the Q output of the operation output inversion circuit 11 is always at the H level, so even if you manually turn off the lights the night before, the lighting load 2 will be automatically turned on in the evening of the next day. It is something that can be done. In the case of this embodiment, the above-mentioned operation of the on/off operation output set circuit 13 prevents the lighting load 2 from being turned on when the external light level is high. In general, there are almost no situations in which lighting load 2 is turned on, so it is safe to say that the operation is the same as that of the conventional example.In fact, when the level of external light is high, lighting load 2 is turned on unnecessarily. It is preferable not to do so.

〔Effect of the invention〕

As described above, the present invention provides an on/off operation output set circuit that controls the load on/off control circuit to turn off the lighting load when the external light level detected by the light receiving section exceeds a predetermined level. When the external light level detected by the light receiving unit falls below a predetermined level, the load on/off control circuit is controlled to turn on the lighting load, so the lighting load can be automatically turned on and off according to the external light level. can be turned on again.
While the external light level is below a predetermined level, the off operation output setting circuit controls the load on/off control circuit to turn the lighting load on and off according to the output of the operational output inversion circuit, so that the external light level remains at the predetermined level. In the following cases, the lighting load can be arbitrarily turned on and off manually by opening the operation switch. Furthermore, the on/off operation output setting circuit maintains the operation output inversion circuit in an output state that turns off the lighting load regardless of the output of the voltage fluctuation detection circuit while the external light level exceeds a predetermined level. When the lighting load is at a predetermined level or higher and there is no need to turn on the lighting load, the operation switch is disabled to prevent the lighting load from being turned on unnecessarily. Furthermore, using a so-called one-shot operation switch, the output of the operation output reversing circuit is inverted to high or low level using the detection output of the voltage fluctuation detection circuit that detects the operating state of this operation switch, so that the external light level is below a predetermined level. , the ON/OFF state is turned on according to the output of this manipulated output inverting circuit.
The off operation output set circuit controls the load on/off control circuit to turn on and off the lighting load, so the operation state of the operation switch is not fixed, and when the outside light level is below a predetermined level, the operation switch turns on and off the lighting load. Even if the external light level is turned on, if the external light level exceeds a predetermined level, the lighting load can be automatically turned off by the on/off operation output set circuit according to the output of the light receiving section. If the level exceeds a predetermined level, the lighting load is kept in the off state by the on/off operation output set circuit, so if the outside light level falls below the predetermined level again, the lighting load will be automatically turned off. Can be turned on. Furthermore, as described above, the lighting load can be turned on and off automatically according to the external light level, and the lighting load can also be turned on and off manually by using an operation switch that operates in one shot. Unlike conventional multi-contact operation switches, there is no need to connect the operation switch and the power supply, and the existing wiring for manual blinking operation can be used as is. This also has the advantage of making wiring work easier.

[Brief explanation of the drawing]

Fig. 1 is a circuit diagram of a conventional example, Fig. 2 is a circuit diagram of another conventional example, Fig. 3 is a block circuit diagram of an embodiment of the present invention, Fig. 4 is an explanatory diagram of the same operation, and Fig. 5 is a circuit diagram showing a specific circuit example of the same as above. 1 is a power supply, 2 is a lighting load, 9 is an operation switch,
10 is a voltage fluctuation detection circuit, 11 is an operation output inverting circuit, 12 is a light receiving section, 13 is an on/off operation output setting circuit, and 14 is a load on/off control circuit.

Claims (1)

[Claims] 1. A normally closed operation switch that opens only when pressed; a load on/off control circuit that is connected in series with a power source together with the lighting load to control the power supply to the lighting load and turn on and off the irradiation load; and the above operation switch. A voltage fluctuation detection circuit that detects whether the switch is open from voltage fluctuations at the non-power supply end of the operation switch, and an operation output whose output state alternates between high and low levels each time the voltage fluctuation detection circuit generates a detection output. An inversion circuit, a light receiving section that detects external light, and when the external light level detected by the light receiving section exceeds a predetermined level, the load on/off control circuit is controlled to turn off the lighting load, and the external light is turned off. The operation output inversion circuit is controlled to an output state that keeps the lighting load off regardless of the output of the voltage fluctuation detection circuit while the level exceeds a predetermined level, and the external light level detected by the light receiving section is lower than the predetermined level. Controls the load on/off control circuit to turn on the lighting load when the lighting load decreases, and
A photoelectric automatic device equipped with an on/off operation output set circuit that controls the load on/off control circuit to turn on and off the lighting load according to the output of the operation output inversion circuit while the external light level is below a predetermined level. Flasher.