JPS5844559Y2 - Electronic street light automatic flasher - Google Patents

Description

[Detailed explanation of the idea] This proposal concerns automatic street light flashers.

To explain the blinking operation with reference to FIG. 1, the operation is performed by connecting a series circuit of a resistive element 3 and a photoconductive cell 4 between AC power supply terminals 1 and 2, and connecting the connection point P to the gate terminal of a thyristor 5. In the circuit, during the daytime, the internal resistance of the photoconductive cell 4 is extremely low, so most of the current flows there, but around sunset, the photoconductive cell 4 responds to the brightness of the outside light and the current flows through its interior. The resistance gradually increases, the current flowing through it gradually moves to the gate terminal side, and the thyristor 5 eventually becomes conductive due to this excitation current.

The thyristor 5 is connected in parallel with the rectifying element 6 with the direction of conduction reversed, and is connected in series to the input terminal of a bridge rectifier 8 for supplying DC current to the reed relay coil 9 via a stopping capacitor 7. This is then connected between power supply terminals 1 and 2 to form an operating circuit.

When the thyristor 5 is non-conducting during the daytime, the half-wave rectified DC current that has passed through the rectifying element 6 charges the stopping capacitor 7 in this circuit, but when charging is completed, the flow stops and the circuit remains in that state during the daytime. vinegar.

When night falls and the thyristor 5 becomes conductive, it becomes conductive in both directions together with the rectifying element 6 connected in parallel, and the current has been blocked due to direct current, but since it has changed to alternating current, the stopping capacitor 7 is turned on. The passed current begins to flow through the bridge rectifier 8 to the reed relay coil 9 as a direct current.

As a result, the reed switch 10 is closed, so the gate of the triac 11 is excited, and conduction occurs between T1 and T-2, and the load lamp 12 connected in series thereto
lights up during the night.

At sunrise, the route is reversed and the lights are turned off during the day.

Figure 2 shows a basic circuit diagram in which the duplicated rectifying elements shown in Figure 1 are simplified and replaced with a bridge rectifier 13 containing one thyristor 5, and its operation and function are completely the same as in Figure 1. are the same.

Figure 3 is a wiring diagram showing one embodiment. Instead of resistor element 3, a capacitor C1 directly connected to the same reactor is used to form a simple zero-voltage switching circuit, and the current flowing through the operating circuit is made into a sinusoidal waveform. This eliminates radio noise.

By inserting capacitor C2, it prevents chattering when the sun sets or the peak of the sun flashes. Electrolytic capacitor C3 is used to smooth the current flowing through reed relay coil 9, and semi-fixed variable resistor R1 is used when the light is on. A fixed resistor R2 for adjusting illuminance is a current limiting resistor of a triac gate.

Conventionally, the reed relay operating current for the photoconductive cell was directly controlled, so the current value was large and the lifespan was shortened due to deterioration over time.However, according to this proposal, a very small amount of about 100 μA is used to control the cynostar gate. Because it requires only a current, deterioration is slow and stable operation is performed over a long period of time.Reed relays also have impressive current values, impressions, and are not subject to restrictions such as open circuit current ratio and can be operated only by considering ON and OFF operations. It has the advantage of being so good that it can be used as a general-use item.

[Brief explanation of drawings]

Figure 1 is a circuit diagram explaining the operation of the present invention, Figure 2 is a basic circuit diagram,
FIG. 3 is a circuit diagram of one embodiment.

Claims (1)

[Scope of utility model registration request] A bridge including a thyristor 5 is used to supply direct current to a reed relay coil 9 for opening and closing a reed switch 10 as shown in FIG. 2 for the purpose of controlling the gate current of a switching element triac for blinking a load lamp. A resistive element 3 and a photoconductive cell 4 are connected in series between the power supply terminals 1.2 in order to control the operating circuit in which the series circuit of the rectifier 13 and the stopping capacitor 7 is connected between the power supply terminals 1.2 using external light. The load lamp 1 is connected by connecting the connecting point P of the shield and the gate terminal of the thyristor 5 to enable or disable conduction of the triac 11 depending on the brightness of the external light.
An electronic street light automatic flasher that blinks 2.