JPH0665162B2 - Lighting load automatic flashing device - Google Patents

Description

TECHNICAL FIELD The present invention relates to an improvement of a lighting load automatic blinking device that is preferably used for street lights and the like.

[Background technology]

In the conventional device of this type, the amount of external light is detected as a change in impedance by a light amount detecting means such as CdS, and a voltage corresponding to the change is applied to the switch control unit to open and close a bimetal switch to control the illumination load. It is blinking automatically.

However, in such a device, the contact of the contacts becomes unstable because the opening / closing operation of the bimetal switch is performed slowly, and the contact pressure is almost 0 near the opening / closing of the contacts of the bimetal switch. For this reason, the contact is made unstable and worn over a long period of time, and the life of the contact is shortened.

Also, the change in the amount of outside light is extremely irregular and may pulsate due to the presence of clouds, etc. If such pulsation occurs in the unstable region of the contact point, the lighting load is fluctuated. This is the cause of the lighting.

Therefore, in order to eliminate such a problem, there has been developed a bimetal switch which is configured by a so-called jump spring and has a hysteresis characteristic in the operation of the switch.

However, in such a device, a mechanism for compensating the ambient temperature cannot be provided in the bimetal switch, so that the amount of heat generated by the heater of the bimetal switch is changed according to the change in the ambient temperature to make the operation unstable. Further, when the mechanism of the bimetal switch is constructed in a jump type, there is a problem that the structure of the device becomes complicated.

On the other hand, in Japanese Utility Model Publication No. 58-47677, Japanese Patent Publication No. 60-63837, and Japanese Patent Publication No. 57-638, a hysteresis characteristic is provided in an electronic circuit so that chattering or the like occurs when the automatic blinking device operates. There is described an automatic blinking device for a lighting load that prevents the lighting state from becoming unstable due to the occurrence of.

However, these automatic blinking devices have a problem in that the circuit configuration itself requires a large number of parts and the configuration is complicated, and the cost may increase.

Further, Japanese Utility Model Publication No. 40-30023 discloses an automatic blinking device in which a relay switch is used to reduce the number of parts required for circuit configuration.

However, in this automatic blinking device, a resistor is connected in parallel with the photoconductive cell, so it does not work in the biasing direction, so when the relay switch operates, problems such as chattering do not occur. However, there is a problem in that the cost is high because a relay switch is used.

[Object of the Invention]

The present invention has been made in view of such circumstances, and an object thereof is to provide a so-called electronic automatic blinking device having a novel configuration that can be configured without using a jump spring mechanism in a switch, Provided is an automatic flashing device for lighting load in which an open / close operation of a switch is surely performed and an unstable state is eliminated when the amount of outside light reaches a predetermined operation level even if the amount of outside light gradually changes. .

[Disclosure of Invention]

 The configuration of the present invention will be described below.

FIG. 1 is an embodiment diagram showing the basic configuration of the present invention.

In the figure, 1 is a main switch, 2 is a lighting load, 3 is a power source, 4 is a light amount detecting means, 5 is a switch control section, and 6 is a voltage variable circuit section including an impedance element 7 such as a resistor. There is.

To explain the basic operation of the present invention, the voltage supplied from the power source 3 to the switch controller 5 is changed by detecting the amount of outside light by the light amount detecting means 4 and changing the impedance thereof. When the voltage supplied to the switch control unit 5 reaches the operation level of the main switch 1, the main switch 1 opens and closes, and the voltage variable circuit unit 6 operates. Then, the voltage supplied to the switch control unit 5 instantaneously increases or decreases, and the switch 1 that has been in the open or closed state is further operated in the urging direction to shift the switch 1 to a stable state. The lighting load 2 is surely blinked.

FIG. 2 shows the operation sequence of the present invention.
FIG. 3b shows an operation characteristic diagram of the main switch in the present invention.

FIGS. 3a and 3b are diagrams showing the change of the driving force f received by the main switch 1 by the function of the voltage variable circuit section 6 in correspondence with the external light amount X. Particularly, FIG. 3a shows A characteristic diagram of the driving force of the main switch increases as the amount of external light increases, and FIG. 3b shows a characteristic diagram of the driving force of the main switch decreasing as the amount of external light increases. As is clear from the examples described below, any of the characteristics can be realized.

In the present invention, as shown in these figures, when the external light quantity X reaches a predetermined level (X1, X2), the voltage variable circuit section 6 operates, so that the driving force f of the main switch 1 is Since the values F1 and F2 at the time of slightly opening or closing instantly increase or decrease by ΔF, when the main switch 1 once reaches the open or closed state, it instantly shifts to a stable state,
Instability is avoided.

In the figure, − indicates a state in which the main switch switches from closed to open (or open to closed), and − indicates a state in which the main switch switches from open to closed (or closed to open). It exhibits hysteresis characteristics.

The embodiment of FIG. 1 will be described in more detail below. The main switch 1 is a bimetal switch having a normally closed (shown as NC) contact, and is interposed between the lighting load 2 and the power supply 3. CdS whose impedance decreases as the amount of external light increases is used as the light amount detection means 4, and a heater for heating a bimetal switch is used as the switch control unit 5, and the heater and CdS are connected in series. The circuit is connected in parallel to the lighting load on the power side of the bimetal switch. Also, one pole of a resistor as an impedance element 7 is connected between the bimetal switch and the lighting load, and the other pole of this resistor is connected to the heater of the series circuit and Cd.
The resistor and the heater are connected in parallel, and CdS as an impedance component is interposed between the resistor and the power source. The resistor, the heater, and the bimetal switch constitute the voltage variable circuit section 6.

Next, the operation of the circuit will be described. Cd when the amount of external light increases
Since the impedance of S4 becomes small, the shared voltage of the heater 5 becomes large, the bimetal switch 1 is heated, the normally closed contact is opened, and the voltage variable circuit section 6 is operated. That is, the resistor 7 connected in parallel to the heater 5 is disconnected, the shared voltage of the heater 5 further increases, and the bimetal switch 1 is further urged in the opening direction to shift to the stable open state. , Make sure that the lighting load 2 is turned off.

On the other hand, when the amount of outside light decreases, the impedance of CdS4 increases, so the shared voltage of the heater 5 decreases, and the normally closed contact of the bimetal switch 1 closes to operate the voltage variable circuit section 6. That is, the resistor 7 is again connected in parallel to the heater 5, the shared voltage of the heater 5 is further reduced, the bimetal switch 1 is further urged in the closing direction, and the bimetal switch 1 shifts to a stable closed state. Make sure that the load 2 is turned on.

〔The invention's effect〕

As can be understood from the above description, according to the present invention, it is possible to avoid an unstable opening / closing operation of the switch means that operates in response to a slow change in the amount of outside light without using the switch of the jump spring mechanism. Therefore, the flickering of the lighting load can be prevented and the blinking can be reliably performed.

Further, by using the bimetal switch, the number of parts can be reduced, and the above effect can be reliably achieved with a simple configuration and at a low cost.

[Brief description of drawings]

FIG. 1 is an embodiment diagram showing the basic concept of the invention, FIG. 2 is a flow chart showing the operation sequence of the invention, FIG. 3a,
FIG. 3b shows an operating characteristic diagram of the switch according to the present invention. 1 ... Main switch, 2 ... Illumination load, 3 ... Power source, 4 ... Light quantity detecting means, 5 ... Switch control section, 6 ... Voltage variable circuit section, 7 ... Impedance element

Front page continuation (72) Inventor Masaaki Ichikawa 1048, Kadoma, Kadoma, Osaka Prefecture Matsushita Electric Works, Ltd. (56) References JP-A-60-63837 (JP, A) JP-A-61-58196 (JP, A) ) JP-A-55-78497 (JP, A) Actual opening 60-38444 (JP, U) Actual opening 57-2533 (JP, U) Actual opening 57-12694 (JP, U) Actual opening 49- 142777 (JP, U) JP-B 57-638 (JP, B2) JP-B 57-48804 (JP, B2) JP-B 40-30023 (JP, Y1) JP-B 40-30022 (JP, Y1) Actual Public Sho 58-47677 (JP, Y2)

Claims (1)

[Claims] 1. A main switch for blinking a lighting load, a switch control section for opening and closing the main switch, and a light quantity detecting means for changing an impedance according to an external light quantity to change a voltage supplied to the switch control section. It has a voltage variable circuit that instantly changes the drive voltage supplied to the switch controller when the main switch is opened and closed to operate the main switch in the biasing direction. In the automatic flashing device for lighting loads that blinks automatically, a bimetal switch having a normally-closed contact as the main switch is interposed between the lighting load and the power supply, and at least the heater as the switch control unit and the CdS as the light amount detecting means are provided. The power supply side of the bimetal switch is connected in parallel to the lighting load. One pole of the impedance element is connected between the two, and the other pole of this impedance element is connected in parallel to at least the heater in the middle of the series circuit so that the impedance component is interposed between the power source, the impedance element, the heater and the bimetal. An automatic flashing device for a lighting load, comprising a voltage variable circuit section including a switch.