JPH0137840B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a circuit for manual operation of a load in an automatic flasher circuit.

Automatic flashers are well known that turn on street lights when ambient lighting becomes dark and turn them off when it becomes bright. Furthermore, since it is uneconomical to keep street lights on continuously from evening until morning, a manually operated circuit as shown in FIG. 1 is already known to allow street lights to be turned off even at night. In the conventional example shown in FIG.
The manually operated switch SW ₀ must be connected to the load lamp L and the automatic blinker EEsw ₀ with three wires, and is a combination of two push button switches, ONsw and OFFsw, and a relay. It was expensive and large.

The purpose of this invention is to improve the above-mentioned drawbacks, and the purpose of this invention is to control the switching circuit of an automatic flasher by adjusting the length of the operation of a normally closed push button switch connected in series between the automatic flasher and an AC power source. The present invention provides a two-wire load control circuit for an automatic flasher circuit in which closing and opening can be performed manually. Hereinafter, one implementation of the present invention will be explained in detail. In Fig. 2, E is an AC power supply, SW is a normally closed push button switch, EEsw is an automatic flasher, and L is a load. The automatic flasher EEsw is as shown in Figure 4.
Switching circuit 1 and this switching circuit 1
The control circuit 2 includes a control circuit 2, an ambient illuminance detection circuit 3, a timing circuit 4, and a rectification circuit 5 that drive this control circuit. Note that C ₁ is a capacitor connected between the power supply of the control circuit 2 and the ground, and C ₃ is a capacitor connected in parallel to the photoelectric conversion element 6 of the ambient illuminance detection circuit 3.

The normally closed push button switch SW includes a normally closed contact 7, a current transformer 8 connected in series to the normally closed contact 7, a light emitting diode 10 connected to a secondary coil 9 of the current transformer 8, a push button 11, and a terminal 12. ,12
and a recovery spring 13, and the light emitting diode 10 is installed in a recess 15 provided with a window 14 of the push button 11. When the push button 11 is pushed down in the direction P against the recovery spring 13, the normally closed contact 7 is closed. Open circuit.

Note that when the automatic flasher is powered on when the ambient illuminance is sufficiently dark, the power source Va of the control circuit 2 is
, the voltage Vb at the connection point b of the resistor R ₃ of the ambient illuminance detection circuit 3 and the photoelectric conversion element 6, and the potential Vc of the base of the transistor Q ₁ of the timing circuit 4.
Va<
Resistors R ₁ , R ₂ , R ₃ , R ₄ , R ₅ and C ₁ , C ₂ , C ₃ are selected so that Vb<Vc. That is, the configuration is such that the potential Vc reaches the predetermined voltage at the earliest.

When evening comes and the ambient illuminance becomes darker than a predetermined illuminance, the potential Vb at the connection point between the photoelectric conversion element 6 and the resistor _R3 of the ambient illuminance detection circuit 3 reaches a high level (H
level), and the potential at point d of the control circuit 2 becomes H level. At this time, the transistor _Q1 of the timing circuit 4 is conductive, and the reset input (R) of the RS flip-flop 16 is at L level. Therefore, since the set input (S) of the RS flip-flop 16 was once at H level during the daytime, the flip-flop 16 maintains the set state. In other words, the output (Q) of the flip-flop 16 is at H level, and the potential Vg at point g is at H level.
level, so transistor Q ₂ goes into a conducting state and transistor Q ₃ goes into a non-conducting state,
A voltage is applied to the gate of the SCR, making the SCR conductive and
The relay is activated and the load L is connected to the AC power source E via the contact Ra.

At this time, the load current I ₀ is applied to the normally closed push button switch SW.
flows, a slight voltage is generated in the secondary coil of the current transformer 8, the light emitting diode 10 emits light, and the operating state of the load L can be confirmed by the position of the normally closed push button.

In this state, if the normally closed push button SW is pressed for a sufficiently long time (about 3 seconds in the example) to open the normally closed contact 7, the automatic flasher EEsw will be in a state where the power supply is opened, and the switching circuit 1 will be in a non-conducting state. The contact Ra of the relay is also opened and the load becomes non-excited, and the voltages of the control circuit power supply Va, the timing circuit output Ve, the base voltage Vc of the transistor _Q1 , and the ambient illuminance detection circuit Vb also become low level. After about 3 seconds, press the button switch.
When the SW is no longer operated, the push button 11 is restored by the recovery spring 13 and the normally closed contact 7 is also closed. Therefore, AC power is applied to the automatic flasher EEsw again. Then, since Va, Vb, and Vc reach a predetermined voltage in this order, when Vb reaches a high level,
Since Vc is still at low level, the transistor
Q ₁ is non-conducting and the output of the timing circuit
Ve becomes H level, and RS flip-flop 16
The reset input (R) of the flip-flop 16 becomes H level, and the state of the flip-flop 16 is inverted to enter the reset state. Therefore, the output (Q) of flip-flop 16 becomes L level. Even if the potential at point f of the control circuit is at H level, the potential at point g is at L level, so the potential at point d is at L level, and the transistor
Q ₂ becomes non-conductive, transistor Q ₃ becomes conductive, no voltage is applied to the gate of the SCR, and the switching circuit becomes non-conductive.

The operation for forcibly turning off the nighttime street light after it has been turned on has been described above, but the operation for turning on the nighttime street light again is as follows. That is, by pressing the normally closed push button switch SW again, the normally closed contact 7 is opened and the closed contact 7 is opened, and the capacitor C ₁
If the opening operation is stopped in such a short time that the charge on capacitor C ₃ and capacitor C 3 is sufficiently discharged and the charge on capacitor C ₂ is not yet discharged, the charge on capacitor C ₂ in the timing circuit has not yet been discharged and Vb When it reaches a high level, it is already
Since Vc is at an H level potential, there is a state where Vb is at an L level while transistor _Q1 is conductive and the output Ve of the timing circuit is at an L level (as mentioned above, the normally closed push button switch When the SW is operated for a short time, the power supply is opened, so the charges in the capacitors _C1 and _C3 are sufficiently discharged, and the voltages Va and Vb become L level once), and the set input of the RS flip-flop 16. (S) is in the H level state [reset input (R) is in the L level state], and the RS flip-flop circuit 16 is inverted and enters the set state. The potential at point d of control circuit 2 becomes H level, and the transistor
Q ₂ becomes conductive, transistor Q ₃ becomes non-conductive,
The SCR becomes conductive, the relay operates, the contact Ra closes, and the load L is excited.

Then, as night turns to morning, the surroundings become brighter, the internal impedance of the photoelectric conversion element 6 decreases, and the voltage decreases.
Vb decreases. The voltage Vc is not affected by changes in the internal impedance of the photoelectric conversion element 6. Therefore, when Vb shifts to L level, the voltage at point f becomes L level, voltage Vb becomes L level, transistor Q ₂ becomes non-conductive, and transistor Q ₃
becomes conductive, SCR becomes non-conductive, relay Ry returns to normal state, and load L becomes non-excited. Furthermore, when day turns to night, the voltage Vb shifts from L level to H level, the voltage at point f shifts from L level to H level, and the voltage at point d also shifts from L level to H level. In this way, once the voltage across the capacitor _C2 is stabilized, the voltage at point g continues to maintain the H level.

Then, when the voltage at the point d shifts to H level at night, the transistor _Q3 becomes non-conductive, the SCR becomes conductive, and the relay Ry is activated.

In addition, we will explain automatic blinking when the light turns off manually at night, then morning, noon, and then night.

In other words, after the voltage Vc reaches a predetermined voltage or higher, the transistor _Q1 continues to be conductive, so the reset input of the flip-flop continues to be at the L level, and therefore the output of the flip-flop is as low as Vg and Vb. When the set input signal shifts to the high level, the set input signal is inverted to the high level, and the state in which Vg is inverted to the high level continues. Therefore, since voltage Vd is the product of Vg and Vf, it is determined by Vf while Vg continues to be at the H level.

Therefore, the voltage Vd is in the same state as the inversion of the H and L levels of the voltage Vf. Therefore, the SCR also follows this and turns the load on and off.

As described above, according to the present invention, there is an ambient illuminance detection circuit, a time constant circuit consisting of a series circuit of a resistor and a capacitor, a control pole is connected to the connection point of the resistor and the capacitor of this time constant circuit, and a voltage is applied to this time constant circuit. a timing circuit consisting of a switching element that becomes conductive after a certain period of time after application of the above-mentioned ambient illuminance; a flip-flop whose set input is the inverted output of the output of the ambient illuminance detection circuit and whose reset input is the output of the timing circuit; A control circuit consisting of a switching element that is connected to output a high level voltage to the next stage switching circuit when both output voltages of the illuminance detection circuit and the illuminance detection circuit are high level, and a control circuit consisting of a switching element that is connected to output a high level voltage to the next switching circuit when both output voltages of the illuminance detection circuit and the illuminance detection circuit are high level. An automatic flasher EEsw is connected in series between the automatic flasher EEsw and an AC power supply, and the light emitting state can be seen from the outside on the secondary side. a current transformer connected to a light-emitting display element attached to a push button;
The normally closed push button switch is connected in series to the current transformer and is equipped with an energization display means having a normally closed contact that opens when the push button is operated. This allows the switching circuit of the automatic flasher EEsw to be inverted between the operating and non-operating states, and the normally closed push button switch's energization display means indicates the normal state of the outdoor load at the position of the normally closed push button switch. 2 in an automatic flasher circuit designed to display
Since it is a wire type outdoor load manual operation circuit, the load can be manually operated by a normally closed push button switch connected in series between the automatic flasher EEsw and the AC power supply E, and the wiring for this switch SW is 2 wires. It is extremely simple, and the switch itself is small and inexpensive. When connecting this manual operation circuit to an existing automatic flasher circuit, there is no need to increase the number of connection wires, and it is a normally closed push button switch. Since the current status of the load can be determined from the position of the switch, for example, if the load is a garden light, the status of the garden light can be determined from the position of the normally closed push button switch indoors. The light can be turned on or off, which is extremely convenient.

[Brief explanation of drawings]

FIG. 1 is an electric circuit diagram showing a conventional example of this invention;
2 to 4 are diagrams showing one embodiment of the present invention, in which FIG. 2 is an electric circuit diagram, FIG. 3 is a sectional view of a normally closed push button switch, and FIG. 4 is an automatic flasher.
The electrical circuit diagram of EEsw is shown. EEsw...Automatic flasher, L...Load, SW...
Normally closed push button switch, E: AC power source, I: switching circuit, 2: control circuit, 3: ambient illuminance detection circuit, 4: timing circuit, 5: rectifier circuit.

Claims (1)

[Scope of Claims] 1. An ambient illuminance detection circuit, a time constant circuit consisting of a series circuit of a resistor and a capacitor, and a control pole connected to a connection point between the resistor and the capacitor of this time constant circuit, and a voltage applied to this time constant circuit. a timing circuit comprising a switching element that becomes conductive after a certain period of time after the signal has been switched on; a flip-flop having an inverted output of the output of the ambient illuminance detection circuit as a set input and an output of the timing circuit as a reset input; A control circuit consisting of a switching element that is connected to output a high level voltage to the next switching circuit when both output voltages of the circuit are high level, and the gate of the switching element is controlled by the output of this control circuit. An automatic flasher EEsw is connected in series between the automatic flasher EEsw and an AC power supply, and a button is pressed while the secondary side is visible from the outside in a light emitting state. A normally closed type push button switch comprising: a current transformer connected to a light emitting display element mounted on the current transformer; and a normally closed push button switch equipped with an energization display means having a normally closed contact connected in series to the current transformer and opened by operating the push button; the length of time a normally closed pushbutton switch is operated;
By shortening the switch, the operating and non-operating states of the switching circuit of the automatic flasher EEsw can be reversed, and the position of this normally closed push button switch is used to indicate the energization state of the outdoor load. A two-wire outdoor load manual operation circuit in an automatic flasher circuit with an indication by means.