JPS603466Y2 - automatic flasher - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a highly sensitive automatic flasher, and particularly to an automatic flasher for outdoor lamps.

Conventionally, commercially available automatic flashers have been designed with ambient brightness, or illuminance, at 3.
0 to 100 IX, the lamp would turn on, and the illuminance at the time of lighting varied widely, and even at unnecessarily high illuminance, for example, toolx, the lamp would turn on.

On the other hand, these are about 6 times as much as when lit (180 to 6001
The light does not turn off unless the illuminance reaches X), and even after the best adjustment, an illuminance of 100 to 2401X is required, which is not energy-saving.

The present invention eliminates the above-mentioned drawbacks of conventional automatic blinkers, which operate at considerably high illuminance levels and have large variations in illuminance.

In other words, the present invention has high sensitivity (lighting and lighting at lower illuminance than before).
The purpose is to provide an automatic flasher that can save energy by turning off the light.

The gist of the present invention is a photoconductive element whose resistance value changes in inverse proportion to the illuminance of incident light, a first variable resistor,
A DC voltage is applied to a series circuit consisting of a second variable resistor and a resistor so that the resistor side has a high potential, and a first Zener diode is connected in parallel with the series circuit so that the cathode side has a high potential. The DC voltage on the high potential side of the photoconductive element is applied to the base of the transistor via the second Zener diode, and the collector of the transistor is applied to the high potential side of the DC voltage via the first relay. a second relay and a timer connected in series to the two contacts that are turned on when the first relay is energized; the emitter is connected to the low potential side of the DC voltage; Driving voltages for the second and third relays are applied to each series circuit in which a third relay is connected, and a contact that turns on when the second relay is energized applies the voltage to the load. The automatic flasher has a contact circuit connected in parallel to the second variable resistor, which turns the applied voltage on and off, energizes the third relay, and turns off after a certain period of time, and turns on the light at the desired time. Alternatively, at the brightness when the light is turned off, the variable resistor VRl or VR2 is adjusted so that the potential on the high potential side of the photoconductive element becomes the value set by the second Zener diode, and the desired brightness is obtained. In this case, a load, such as a lamp, is turned on or off.

Next, an embodiment of the present invention is shown in FIG.

In the figure, 10 is a DC power supply, for example, a commercial voltage (
AC 100V) is input to the primary side of power transformer 1,
The output from the next side is rectified by a four-terminal bridge rectifier 2, and the rectified DC voltage of, for example, 24 V is configured to be output to the positive output terminal (output terminal) and the negative output terminal (-1).

Note that a smoothing capacitor C□ for preventing pulsation is connected between the positive output terminal (1) and the negative output terminal ().

20 is a relay drive circuit, which includes resistors R2 and R3,
A series circuit formed from the variable resistors VR2 and VRl and the photoconductive element CdS connects to the resistor R1 at the open end of the resistor R2.
It is connected to the positive output terminal (1) through the resistor R2, and a DC voltage is applied to the resistor R2 side of the series circuit so as to have a high potential.

Further, the cathode side for the Zener diode (3) is connected to the connection portion between the resistors R2 and R3, and the anode side thereof is connected to the negative output terminal (←) of the DC power supply 10.

A contact SW3 circuit of a timer relay Ry3 is connected in parallel to both ends of the variable resistor VR2.
When the contact SW3 is not energized, the contact SW3 circuit is on.

The cathode of a Zener diode ZD2 is connected to the high potential side of the photoconductive element CdS, and this diode ZD2
The anode of the transistor TR1 is connected to the base of the transistor TR1 via a resistor R1, and is also connected to the negative output terminal (-) via a capacitor C2.

The transistor TR1 is of the NPN type, and its emitter is connected to the negative output terminal (-), and its collector is connected to the high potential side of the resistor R2 via the relay Ryl.

Next, the relay Ryl turns off in the non-excited state (S
W12 and 5W13), a relay Ry2 is connected in series with the contact 5w12, a timer relay Ry3 is connected in series with the contact 5w13, and each series circuit has an AC voltage of 100V, which is the commercial voltage. Voltage is applied.

Further, a load such as a lamp is connected in series to the contact sw2 of the relay Ry2, and the 100
An alternating voltage of V is applied.

Incidentally, the Zener diode ZDi keeps the voltage for operating the transistor circuit constant, for example, 16V, without being affected by fluctuations in the power supply voltage, and also maintains the voltage for operating the transistor circuit at 16V, for example.
0 pulsating flow is removed.

Further, if the connection point on the high potential side of the photoconductive element CdS is A, then the set voltage of the Zener diode ZD2 gives
When the potential at the connection point A exceeds, for example, 6V, a voltage corresponding to the excess voltage is applied to the base of the transistor TR1, the transistor TR1 is turned on, and the relay Ry1 is energized.

Of course, even if it is directly connected to the transistor TR1 without using the Zener diode ZD2, the on-off operation of the blinker can occur.

However, since the characteristic values of transistors change depending on changes in outside temperature, the on-off operation does not necessarily depend only on illuminance.

That is, variations occur in the on-off operation.

Transistor TR using Zener diode ZD2
By raising the base potential of 1, this variation can be eliminated.

The operation of the automatic flasher according to the embodiment will be explained below.

First, let us consider when the illuminance of the light incident on the photoconductive element CdS is high, that is, when it is bright.

When the illuminance of the light incident on the photoconductive element CdS is high, the resistance value of the photoconductive element CdS is low, so the potential at the connection part A is lower than, for example, 6V, and the transistor TR1 is not turned on.

Therefore, since the relay Ryl is not excited, the contact 5w
12 and 5w13 are off, the relay Ry2 and timer relay Ry3 are non-energized, and the contact SW
2 is off, and the contact SW3 remains on.

The lamp is therefore extinguished. Next, consider a state in which the light incident on the photoconductive element CdS changes from a bright state to a dark state, that is, when the lamp is turned on from an off state.

Since the contact SW3 is on when the light is off, the potential level of the connection point A can be adjusted by the variable resistor V.
In order to turn on the lamp at a desired brightness of 151X, for example, the variable resistor VRl may be adjusted so that the potential of the connection part A becomes 6V at a brightness of 151X.

Here, as the brightness of the light decreases, the resistance value of the photoconductive element CdS increases.
When it becomes less than X, the potential of the connection part A exceeds 6V, the transistor TR1 is turned on, and the relay Ryl is excited.

Therefore, the connection points 5w12 and 5w13 are turned on, and the relay Ry2 and timer relay Ry3 are excited.

When the relay Ry2 is energized, the contact SW2
is turned on and the lamp lights up.

Furthermore, by energizing the timer relay Ry3, the contact SW3 is turned off after a certain period of time, for example, 3 times.

Here, the reason why the contact sw3 is turned off after a certain period of time is that if it is turned off instantaneously, the potential of the connection part A becomes 6V or less due to the variable resistor VR2, and the relay Ry1 malfunctions, that is, becomes non-energized. In order to avoid this, the setting time of the timer relay Ry3 is set so that the resistance value of the photoconductive element CdS increases until the potential of the connection part A becomes 6V or more even when the contact is turned off. set to an hour or more.

Finally, consider a time when the surroundings become bright and the lamp goes from being lit to being turned off.

In the steady lighting state, the contact sw3 is off, and the variable resistor VR2 may be adjusted so that the potential of the connection A at a brightness of 101X, for example, 6V when the lamp is turned off.

Then, when the brightness of the light becomes brighter than, for example, 101X, the potential of the connection part A becomes 6V or less, the transistor TR1 is turned off, and the lamp is extinguished.

The capacitor C2 serves to prevent the transistor TRi from malfunctioning due to instantaneous changes in light such as lightning.

As described above, the automatic flasher of the present invention eliminates the influence of the power supply voltage by the Zener diode ZDl, and because the group of relays is driven by the transistor TRi, it operates with high sensitivity even with slight changes in illuminance, and there is no variation in blinking. It disappears.

In addition, the contact sw3 has the effect that the illuminance can be adjusted separately when the lamp is turned on and when the lamp is turned off.Furthermore, because of its delayed operation, the on state of the transistor TR1 is guaranteed, so that the lamp does not go out immediately after the lamp is turned on. It has the effect of preventing

In addition, compared to conventional automatic flashers, the automatic flasher of this invention has
The time saved when the lights were turned on was reduced by 6 minutes, and the time saved when the lights were turned off was reduced by 17 minutes.

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram showing an embodiment of the present invention. 10: DC power supply, 20: Relay drive circuit, addition 1.2: Zener diode, CdS: photoconductive element, Ryl, 2
: Relay, Ry3: Timer relay, SWI 2. 13
:Ryl contact, SW2:Ry2 contact 1, SW3:
Contact point of Ry3.

Claims (1)

[Claims for Utility Model Registration] A series circuit consisting of a photoconductive element whose resistance value changes in inverse proportion to the intensity of incident light, a first variable resistor, a second variable resistor, and a resistor. A DC voltage is applied so that the resistor side has a high potential, and a first Zener diode is connected in parallel with the series circuit so that the cathode side has a high potential, and the high potential side of the photoconductive element A DC voltage is applied to the base of the transistor via a second Zener diode, the collector of the transistor is connected to the high potential side of the DC voltage via a first relay, and the emitter is connected to the low potential side of the DC voltage. , and a second relay and a third relay, which is a timer relay, are connected in series to two contacts that are turned on when the first relay is energized. A voltage for driving the second and third relays is applied to the series circuit, and a contact that turns on when the second relay is energized turns on and off the voltage applied to the load, and the third relay An automatic flasher characterized in that a contact circuit that is energized and turns off after a certain period of time is connected in parallel to the second variable resistor.