JPH01134897A - Photoelectric automatically flashing device - Google Patents

Abstract

PURPOSE:To reduce power consumption in the case of using two winding latch relay with no auxiliary contact by taking an on-off signal of a control circuit as one pulse signal through opening/closing of contacts except a main contact of that relay. CONSTITUTION:In the case the there becomes bright in the surroundings, the resistance value of CdS1 is lowered and an input voltage is lowered from a comparator CP1 to a comparator CP4 in order, thereby an output being reversed. Only the output from comparators CP2, CP4 are received to RS latches La1 to La3. Thus, the output from a NAND circuit NAND1 is H level and the output form a NAND circuit NAND2 is also H level. Accordingly, a transistor Q2 is conducted with the output of the NAND circuit NAND2 so as to apply an exciting current to an exciting coil L2 and thereby a contact r1 is opened for putting-out a lighting load L. As relay Ry1 is driven, a contact r2 is opened. Thus, the output from an inverter I1 is lowered to L level so that the transistor Q2 is non-conducted resulting in cut-off of the exciting current to the exciting coil L2.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field 1] The present invention relates to a photoelectric automatic flasher that automatically controls lighting of a lighting load by detecting ambient illuminance with a light receiving element.

[Background Art 1] As this type of photoelectric automatic flasher, one has been developed that is equipped with a light-receiving element that detects ambient illuminance and automatically controls lighting of a lighting load using the output of this light-receiving element. This rechargeable automatic flasher uses CdS, whose resistance value decreases when the surrounding illuminance becomes brighter, as the light-receiving element.
A control circuit that compares the voltage across S with a reference voltage using a comparator to detect when the ambient illuminance has reached a predetermined illuminance is activated, and the relay is driven by an on signal or an off signal output from this control circuit. The lighting of the lighting load is controlled by opening and opening a main contact inserted between the power source of the relay and the lighting load. Conventionally, a two-winding latching relay with an auxiliary contact is used as the above-mentioned relay, and once the excitation current flows through either excitation filter, the auxiliary contact is switched to cut off the current in one of the energized windings. At the same time, the excitation circuit is switched so that the excitation current flows through the other winding.

However, when a 28#I latching relay without an auxiliary contact is used in the photoelectric automatic flashing circuit described above, one of the windings is always energized, resulting in a problem that the relay's power consumption increases. was there.

[Object of the Invention] The present invention has been made in view of the above-mentioned points, and its purpose is to reduce the power consumption of the relay even if a two-winding latching relay without an auxiliary contact is used. Our goal is to provide a photoelectric automatic flasher that does not.

[Disclosure of the Invention 1 (Structure) The present invention provides a light receiving element that detects ambient illuminance, a capacitor that prevents the output of this light receiving element from fluctuating due to instantaneous changes in ambient illuminance, and a voltage across the capacitor. A control circuit that detects that the ambient illuminance has reached a predetermined illuminance at which the lighting load is turned on or off by comparing it with a reference voltage using a comparator, and outputs on and off signals to control the lighting of the lighting load, respectively. and a two-winding latching relay that does not have an auxiliary contact and has a contact in addition to the main contact that is connected to the lighting load and the power supply, and the relay is activated by an on signal and an off signal from the control circuit, respectively. 8# each
a drive circuit that opens and closes the respective contacts by respectively exciting them;
It is equipped with a one-pulse circuit that converts the ON/OFF signal of the control circuit into a one-pulse signal by opening and closing contacts other than the main contacts of the relay, and the one-pulse circuit converts the ON and OFF signals of the control circuit into one-pulse signals by opening and closing contacts other than the main contacts of the relay. By making the ON signal and OFF signal one-pulse signals, the excitation current does not flow through the relay winding after switching the main contact.

(Example) An embodiment of the present invention is shown in FIGS. 1 and 2. FIG.

The photoelectric automatic flasher of this embodiment uses a two-winding latching relay RY+ whose main contact r is inserted between the lighting load and the AC power source AC, and which does not have an auxiliary contact. The relay RY+ is driven and controlled by the output of the control circuit 2 in accordance with the output of Cd51 as a light receiving element for detecting the light, thereby controlling the supply of power to the lighting load. By comparing the above Cd51, this CdS 1 output, and the reference voltage, it is detected that the ambient illuminance has reached a predetermined illuminance for turning on or off the lighting load 1. The control circuit 2 that outputs ON and OFF signals for lighting control is a DC stabilized power supply that is stabilized by rectifying and smoothing AC power supply AC with a resistor R, a Zener diode ZD, and a capacitor C36. Operates as a power source. The above CdS 1 consists of a resistor R1゜R1 and a variable resistor R
2 in series with both ends of the DC stabilized power supply.

The variable resistor R2 is used to adjust the lighting load of the rechargeable automatic flasher or the tlWl lighting. A resistor R4 is connected to both ends of the series circuit of the CdS 1 and the resistor R3 to prevent the input voltages of the comparators CP1 to CP of the control circuit 2, which will be described later, from changing due to instantaneous fluctuations in ambient illuminance. capacitor C5
Connect it.

The photoelectric automatic flasher in this example is of JIS2 type.
The control circuit 2 latches the RS of the comparators CP1 to CP, "+ -L a3, NAND circuit N A N D ,, N
AND2 and inverter I form an ellipse. The input terminals of the comparators CP, ~CP, each have a resistor R,
The voltage across Cd51 via R is input, and the input voltage is input to the non-inverting input terminals of the comparators cp, ,cp, and the inverting input terminals of the comparators cp, ,cp, each comparator CP,
The reference voltages of ~CP are set to different voltages.

In other words, a voltage dividing circuit consisting of resistors R7 to R5 is connected to both ends of the DC stabilized power supply, and the voltages divided into different voltages are input to the other input terminals of the respective humpparators CP, ~CP. This is the reference voltage. Then, the output of each comparator CP, ~CP4 is sent to the next stage RS latch L.
The output of the latch La t La 2 is input to the NAND circuit NAND, and the output of the NAND circuit NAND and the output of the latch La3 are connected as appropriate. It is input to the NAND circuit NAND2. In addition, the above NAND circuit N
The AND2 output is used as an off signal for turning off the lighting load, and the output obtained by inverting this NAND circuit NAND2 output by the inverter 11 is used as an on signal for turning on the lighting load.

The drive circuit 3 that controls the lighting state of the lighting load by the on signal and off signal from the control circuit 2 is a 28-wire latching relay R that does not have the above-mentioned auxiliary contact.
V+ and the excitation coil L, which is the winding of this relay R1+,
, L2, and transistors Q, , Q2 that cause excitation current to flow through them. In addition to the main contact r, the relay RF+ is equipped with a contact ``2'' that opens and closes together with the main contact r+.The NAND circuit NAND2 output and the inverter 11 output are input to the bases of the transistors Q1 and Q2, respectively. By turning on the respective transistors Q, Q2, the main contact "1" and the contact "2" are switched to either the open or closed state.

According to the above-described configuration, the excitation filter L of the two-winding latching relay Ry, which is not provided with an auxiliary contact as in this embodiment,
, , L2 continues to flow the excitation current even after switching the main contact r, increasing the power consumption of the relay RY+. Therefore, a one-pulse circuit 4 is provided which converts the on/off signal outputted from the control circuit 2 into a one-pulse signal by connecting the relay Ry+ and opening/closing αr2. This one pulse circuit 4
connects the DC stabilized power supply output described above to the resistor RIOIRI+
Input the voltage divided by , and connect the inverter I2 to which contact ``2'' of the relay R7+ is connected between the input terminal and 7-, and between the input of this inverter I2 and the output of inverter and a diode D2 connected between the output of the inverter I2 and the output of the NAND circuit NAND2.

The basic operation of this embodiment will be explained below.

First, a case will be described in which the ambient illuminance increases from night to morning as shown by arrow A in FIG. 2(a). At this time, the lighting load is at the contact point of relay RY+.

When the switch is closed, an alternating current power supply AC is supplied and the light is turned on. Then, when the surroundings become brighter, the resistance value of CdS 1 decreases in accordance with the ambient illuminance, so the input voltage decreases in order from comparator CP1 to comparator CP, and the output is inverted. In other words,
Comparator CP+=CP s output from cover-by level to low level, comparators cp, , cp, invert from low level to high level. Here, the next stage RSS
Latches La1 to La are comparators CP, ~c p ,
Since the input is accepted only when the output rises from low level to high level, in this case, comparator cp2. Only the output of cp, is the RS latch Lal-La
,.

A reception is attached to the. Therefore, the RS latch LaI is set and the output becomes high level, the RS latch La2 is reset and the output becomes low level, and the RS latch La3 is also reset and the output becomes low level.

Therefore, the output of the NAND circuit NAND that performs the NAND of the output of the RS latch L a2 becomes high level, and the output of this NAND circuit NAND and the RS latch La3
Negation with output i! ii NAND circuit that fills the space,
The output also becomes high level as shown in FIG. 2(c). Therefore, at this time, the output of the NAND circuit NAND2 turns on the transistor Q2, and an excitation current flows through the excitation coil L2. Therefore, the contact r is driven to the open state and the lighting load is turned off. When the relay RF+ is activated in this way, the contact "2" is opened together with the main contact r1. Therefore, the input of the inverter I2 is
The output of inverter I2 becomes high level as shown in (d), and the output of inverter I2 becomes low level as shown in (e) of the figure.
The output of the inverter 11 is forcibly pulled down to a low level via the diode D2, the transistor Q2 becomes non-conductive, and the excitation current of the excitation filter L2 is cut off. In other words, the OFF signal input to the transistor Q2 by opening the contact ``2'' becomes a one-pulse signal as shown in FIG. 2(g).

Next, we will explain what happens when the surroundings become dark.

As shown by the arrow in FIG.
l? CP! The output is inverted from low level to high level, and comparators CP, CPJJ are inverted from high level to low level. Therefore, conhalator cp,
At the output of cp, the RS latch Lal is reset and the output becomes low level, the RS latch La2 is set and the output is high level, and the RSS latch La is also set and the output is inverted to high level. Therefore, the NAND circuit NAN
D, output and l? Both the S latch La and the output become high level, so the NAND circuit NAND2 output becomes as shown in Figure 2 (
It becomes low level as shown in e). At this time, the output of inverter 11, which inverts the output of NAND circuit NAND2, becomes a high level as shown in FIG. r is closed and the lighting load is turned on. At this time, contact r2 is also closed, so the input of inverter 2 becomes low level as shown in Figure 2(d), and the output of inverter 11 is forcibly pulled down to low level via diode D1. It will be done.

For this reason, transistor Q.

is turned off, the excitation coil is turned off, and the excitation current to the excitation coil is cut off. In other words, the one-pulse signal shown in FIG. 2(f) is input to the transistor Q.

In this way, by providing the one-pulse circuit 4, after the main contact r of the relay Ry1 is switched, the ON signal and the OFF signal are forcibly pulled down to low level by opening and closing the contact ``2'', and the excitation coil L + −L 2
A two-winding latching relay R31' that can stop the supply of excitation current to the R31'
Even if + is used, the power consumption of relay RV+ can be reduced similarly to the two-winding latching relay provided with an auxiliary contact.

By the way, in the photoelectric automatic flasher described above, the two-winding rafting relay RV+ was used in the drive circuit 3, but as shown in Fig. 3, even if a triac Qco is used in place of the relay RyI, the above-mentioned relay It is possible to construct a rechargeable automatic flasher that operates in the same way as when Ry+ is used. In addition, in the circuit shown in FIG. 3, the conduction control of the triac Q3 is performed using the control unit 2 which is almost the same as the circuit using the relay RF+ described above, and the connection is made between the lighting load and the AC power source AC. F Ryack Q, and the above relay Ry
, 5CRQ conducts at the inverter 11 output that inverts the NAND circuit NAND2 output of the control circuit 2 using , and the above-mentioned triac Q when this 5CRQ4 is conductive. The drive circuit 3 is composed of the diode preamps 7 and DB. In operation, when the sun goes down and the surroundings become dark, the output of the inverter 11 becomes high level as described above, so that 5CRQ is kept conductive. Therefore, since voltage is applied to the date of the triac Q3 via the diode bridge DB regardless of the polarity of the AC, the triac Q becomes conductive and the lighting load lights up. . On the other hand, when the surrounding area gets brighter,
Since inverter I output becomes low level, 5CRQ
, becomes non-conductive, and the triac Q is turned off, causing the lighting load to go out. Triac Q like this.

Using a relay is more resistant to noise than using a relay, and since a relay does not require any peripheral parts, it has the advantage of reducing the number of parts. Also, power consumption can be reduced as in the case of using a relay.

By the way, the above circuit has been explained for a photoelectric automatic flasher, a so-called EE switch, which is compatible with the operating illuminance of JIS 2 type. By switching and connecting the resistor R5 and the resistor RX with the switch S, the JIS 2 type EE switch can be made into an EE switch that is compatible with the JISI type operating illuminance. The resistance value of the resistor Rx is set so that the input voltage of the comparator CP4 does not fall to the lowest value voltage of the comparator CP. If such a resistor RX is connected in place of the resistor R5, the output of the RS latch La2yLa3 will not be reset at the rise of the output of the comparator CP, so the output of the RS latch L aHL a3 will be held at a high level, and the lighting load The effective output for controlling the lighting of the lighting load is only the output of the RS latch La1, that is, the output of only the humperators cp, . The solid lines in Fig. 5 are the output states of each part in the case of the above-mentioned JIS2 type! ! ! !
(The shaded area indicates the high level), and the broken lines in the figure indicate the output status of each part for the JISI type.
Note that the outputs A-J in FIG. 5 correspond to the outputs A-J given the same reference numerals in FIG. 4. By switching the switch S to the resistor RX side in this way, one product can have two types of characteristics, and a wide range of EE characteristics that go beyond the JIS classification can be achieved.
It can be a switch.

Incidentally, the output terminal of the Cd 51 is connected to a printed circuit board or the like on which the control circuit 2 and the like are mounted using a lead wire or the like. Therefore, there is a possibility that this CdS 1 may move and the operating sensitivity may fluctuate. Therefore, as shown in FIG. 6, if the casing 5 housing the CdS 1 is provided with a mechanism to restrict the movement of the CdS 1, the above problem will not occur.

[Effect of the Invention 1] As described above, the present invention includes a light receiving element that detects ambient illuminance, a capacitor that prevents the output of this light receiving element from fluctuating due to instantaneous changes in ambient illuminance, and both ends of this capacitor. By comparing the voltage and the reference voltage with a comparator, it detects that the ambient illuminance has reached a predetermined illuminance that turns on or off the lighting load, and outputs on and off signals to control the lighting of the lighting load, respectively. A 28M8M latching relay is equipped with a contact other than the main contact that is connected to the lighting load and the power source without the circuit, auxiliary liquid, and α. It is equipped with a drive circuit in which each winding is excited to open and close each contact, and a one-pulse circuit which converts the ON/OFF signal of the control circuit into a one-pulse signal by opening and closing contacts other than the main contact of the relay. The one-pulse circuit can turn the ON and OFF signals of the control circuit into one-pulse signals by opening and closing contacts other than the relay's main contacts, so that the excitation current does not flow through the relay winding after switching the main contacts. Therefore, even when a two-winding latching relay without an auxiliary contact is used, power consumption can be reduced.

[Brief explanation of the drawing]

Fig. 1 is a specific circuit diagram of an embodiment of the present invention, Fig. 2 is an explanatory diagram of the same operation, Fig. 3 is a specific circuit diagram when the above relay is replaced with a triac, and Fig. 4 is the same as the above. A circuit diagram of the control unit that can also be used as an ISI type, Figure #S5 is an explanatory diagram of the same operation as above, Figures 6 (a) and (b)
These are a partial plan sectional view and a partial side sectional view showing the holding structure of C and dS same as above. 1 is CdS, 2 is a control circuit, 3 is a drive circuit, 4 is a one-pulse circuit, CI), ~CP is a comparator, AC is an alternating current power supply, L is a lighting load, Ry+ is a two-winding latching relay, r is a main 11 points, ``2 is a contact and C3 is a capacitor. Agent Patent Attorney Ishi 1) Ai 7th 2m Figure 4 Figure 5 Figure 6 (Q) (b)

Claims (1)

[Claims] (1) A light receiving element that detects ambient illuminance, a capacitor that prevents the output of this light receiving element from fluctuating due to instantaneous changes in ambient illuminance, and a comparator that compares the voltage across this capacitor with the reference voltage. A control circuit that detects when the ambient illuminance has reached a predetermined illuminance to turn on or turn off the lighting load and outputs on and off signals to control the lighting of the lighting load, and a control circuit that outputs ON and OFF signals respectively to control the lighting of the lighting load, and a control circuit that detects when the ambient illuminance has reached a predetermined illuminance that turns on or off the lighting load, and a control circuit that outputs ON and OFF signals respectively to control the lighting of the lighting load. The two-winding latching relay has a contact other than the main contact connected between the control circuit and the power supply, and each winding of the relay is excited by the ON signal and OFF signal from the control circuit, respectively. A photoelectric automatic flasher comprising: a drive circuit that opens and closes contacts; and a one-pulse circuit that converts the ON/OFF signal of the control circuit into a one-pulse signal by opening and closing contacts other than the main contacts of the relay.