JP3210686B2 - Thermal load control device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat-sensitive load control device for controlling a load in accordance with the presence or absence of a heat source such as a person.

[0002]

2. Description of the Related Art Conventionally, there has been provided a heat-sensitive load control device which turns on and off a load such as a lighting load in accordance with the presence or absence of a heat source such as a person. This type of heat-sensitive load control device suppresses unnecessary power consumption by turning off the light when nobody is present, and automatically turns on the light when both hands are closed and switches such as walls cannot be operated. It is used for the purpose of blinking temporarily or turning on the light only while there is a person at the entrance. In order to achieve such an object, a conventional thermal load control device is configured to, after detecting a heat source, continuously supply power to a load for a certain period of time. It is usually set long enough to do the work.

[0003]

By the way, if a fluorescent lamp is used as illumination, in a library or a museum, there is a problem that a book or a work of art is damaged by ultraviolet rays. Therefore, it is desirable to reduce the time for using the lighting as much as possible. However, if the power supply time is set to a certain time, the illumination is kept turned on even after the errand is completed, and there is a problem that the above-described desirable control cannot be performed.

On the other hand, there is a configuration in which a switch for forcibly starting or stopping power supply to a load can be connected regardless of the power supply time. Even in this case, the lighting can be turned off. However, this is no different from a normal switch, and the next time a person enters the room, the operation of the switch will be required, and it will be meaningless to automatically flash the light. Problem.

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-mentioned problem, and it is possible to perform an operation of forcibly stopping power supply even during a power supply time to a load. The present invention aims to provide a heat-sensitive load control device in which the power supply to the load is automatically controlled by returning to the normal operation of the load control device.

[0006]

According to the present invention, in order to achieve the above object, a thermal sensor for generating a binary signal corresponding to the presence or absence of a person and a thermal sensor connected to the thermal sensor via a signal line are provided. oN the load in response to a binary signal, and a controller to turn off, the controller includes a timer means for setting a power supply time to the load starting from the detection of the human that by the thermal sensor, a first input A first input circuit having a terminal and changing the output when the first input terminal is short-circuited, and a second input circuit having a second input terminal and changing the output when the second input terminal is short-circuited A delay circuit for inverting the output when the output change of the second input circuit continues for a predetermined time; and an RS flip-flop for latching the output change of the first input circuit and releasing the latch by the output change of the second input circuit Circuit and After the end of feeding time when S flip-flop circuit is latched state even forcibly continues power supply to the load, while the delay circuit is to invert the output change of the second input circuit power supply to the load When the latch circuit of the RS flip- flop circuit is released while the delay circuit is not inverting the output change of the second input circuit, the power supply to the load is forcibly stopped and the thermal sensor is stopped. drunk people
And a NOR circuit for returning the state to the state in which is detected.

[0007]

According to the above arrangement, since it is returned to the state of detecting a human by the thermal sensor forcibly stop the second input terminal is short-circuited power supply to the load before the power supply time has elapsed if the input signals from the external even during the feeding time to the load, and as it can be operated to stop the forced feeding, moreover, <br/> detects a person by the thermal sensor after the operation since returning to the state of is the power supply to the load when detecting a person to the next is started automatically. Moreover, by delaying the short circuit state of the second input terminal by the delay circuit, because while the output of the delay circuit is to invert the output change of the second input circuit to forcibly stop the power supply to the load, If the short-circuit state of the second input terminal continues, the state in which power supply to the load is stopped can be continued. On the other hand, when the short-circuit state of the second input terminal does not continue for a certain period of time, the output of the delay circuit is not inverted and the RS flip- flop circuit is ready to receive the output change of the first input circuit. by will be returned to the state to detect the person. That is, depending on the type of switch connected to the second input terminal, and be returned to the state of detecting a human by the thermal sensor after stopping the power supply to the load, regardless of the detected state of the heat-sensitive sensor It is possible to select to continue the state in which power supply to the load is stopped, so that the usability is good.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As shown in FIG. 3, basically, based on a thermal sensor 1 for detecting the presence or absence of a heat source such as a person in a detection area using a pyroelectric element or the like, and based on an output of the thermal sensor 1. Load 3
And a controller 2 for controlling the The controller 2 includes a signal line L to the thermal sensor 1 as shown in FIG.
signal terminal T ₁ for connecting the s, and a like power terminal T _2, the control terminal T ₃ for connecting the control line Lc to a load such as a lighting load connected to the power supply line Lp to commercial AC power source AC.
The controller 2 also includes a switch S described later.
Two types of input terminals T ₄ and T ₅ for connecting W ₁ , SW ₂ and SW ₃ , and a contact output terminal T _{6 for} only opening and closing the line with no voltage are provided.

The thermal sensor 1 changes the line voltage of the signal line Ls when detecting that the heat source has entered the detection area. The basic configuration includes a bridge rectifier circuit having an AC terminal connected to the signal line Ls, a series circuit of a Zener diode and a switch element connected between the DC terminals of the bridge rectifier circuit, and the presence or absence of a heat source. And a thermo-sensitive element such as a pyroelectric element that opens and closes a switch element in response to the above-mentioned condition, and is configured to be supplied with power from a current source provided in the controller 2 via a signal line Ls. In short, depending on the presence or absence of a heat source in the detection area of the thermal sensor 1, the signal line Ls
Is changed in two stages, and a binary signal resulting from this voltage change is transmitted to the controller 2.

The control circuit 20 inside the controller 2
It is configured as shown in FIG. That is, the power supply terminal T ₂
A power supply circuit 21 for stepping down and rectifying and smoothing a commercial AC power supply AC connected to the power supply circuit, and a constant voltage circuit 22 for converting the output voltage of the power supply circuit 21 to a constant voltage. Power is supplied to the Further, the output of the constant voltage circuit 22 is sent to the signal terminal T ₁ through the current limiting circuit 23, so that the power supply to the thermal sensor 1 is made. By providing the current limiting circuit 23, the current flowing through the signal line Ls is limited so that the change in the line voltage of the signal line Ls does not affect the power supply voltage inside the controller 2.

The line voltage of the signal line Ls connected to the signal terminal T ₁ is determined by a comparator CP provided in the signal determination circuit 24.
Is compared with the reference voltage generated by the Zener diode ZD. When a heat source is detected by the thermal sensor 1, the comparator C which is the output of the signal determination circuit 24
The output of P becomes H level. The output of the signal determination circuit 24 is inputted to the NOR circuit NOR _1. When controlling the load 3 based on the output of the thermal sensor 1, the NOR circuit NO
Since the other input of R ₁ is at L level, the NOR circuit NOR ₁ is used only during the period when the output of the signal determination circuit 24 is at H level.
Is at L level. The output of the NOR circuit NOR ₁ is
It becomes a trigger signal to the relay drive circuit 25 and the timer circuit 26. The relay drive circuit 25 includes a NOR circuit NOR ₂ to which a trigger signal is input, a transistor Q ₁ that is turned on while the output of the NOR circuit NOR ₂ is at the H level, and a latching relay connected to the collector / emitter of the transistor Q _1. RS set coils are connected in series. Before the load 3 is turned on by the output of the thermal sensor 1, the contacts r ₁ and r ₂ of the latching relay RS are off, so that the other input of the NOR circuit NOR ₂ is at L level and the trigger the output of the NOR circuit NOR ₂ by the occurrence of the signal becomes H level, the transistor Q ₁ is current flows through the set coil is turned on, resulting in the contact r _1, r ₂ is turned on. Thus, one input of the NOR circuit NOR ₂ is always H level, hereinafter, the transistor Q ₁ is are kept off. Contact r ₂ are, from being inserted between the power supply terminal T ₂ and the control terminal T _3, it become to be fed to the load 3 when the thermal sensor 1 detects a heat source.

On the other hand, a timer circuit 26 serving as timer means
Is the NOR circuit NOR₁Trigger on rising edge of output
Once the timed operation starts, the resistance R₁, R_Two,
Capacitor C₁, C_Two, Determined by the variable resistance VR
During the time limit, NOR circuit NOR _ThreeOutput at L level
When the time limit elapses, the NOR circuit NOR_ThreeOutput
Start up to H level. NOR circuit NOR_ThreeOutput is
A circuit NOR_FourThrough the relay drive circuit 25
You. When controlling the load 3 by the output of the thermal sensor 1
Has a NOR circuit NOR_FourIs at L level
When the time limit of the timer circuit 26 elapses,
Road NOR_FourIs at L level. Relay drive circuit 2
5 has a NOR circuit NOR_FourNOR circuit to which the output of
NOR_Five, NOR circuit NOR_FiveWhen the output of
Transistor Q that turns on_Two, Contact r₁Turned on
Sometimes knots connected so that the output is at L level
And a transistor Q_TwoCollector et
The reset coil of the latching relay RS is connected to the transmitter.
Is done. NOR circuit NOR_FourOutput of the NOR circuit NOR _Five
Of the NOR circuit NOR_FiveThe other of
Is the output of the NOT circuit NOT input to the input terminal?
When the time limit of the timer circuit 26 elapses, the NOR circuit
NOR_FiveBecomes H level and the transistor Q_TwoBut
Turns on and reset coil of latching relay RS
The current flows and the contact r₁, R_TwoTurns off. Contact r₁But
When the output is turned off, the output of the NOT circuit NOT becomes H level.
The transistor Q_TwoIs kept off. But
Thus, when the heat sensor 1 detects a heat source,
3, the power supply is started, and the time limit of the timer circuit 26 elapses.
After that, the power supply to the load 3 is stopped. Knot times
The output of the path NOT is the transistor Q_ThreeControl on / off
And the transistor Q_ThreeEmitter co
The relay coil Ry is connected in series to the
The relay contact r is opened and closed according to the output of the road NOT. You
That is, the relay contact r corresponds to turning on / off the power supply to the load 3.
And then turned on and off. This relay contact r
Both ends are contact output terminals T₆It is connected to the.

By the way, regardless of the presence or absence of a heat source, the load 3
There is a case where it is desired to continuously supply power to the power supply. For this purpose, an input circuit 27 which output is at the H level when the input terminal T ₄ is short-circuited, the output of the input circuit 27 raises up the output becomes H-level to the H level (i.e. input circuit
27 output) RS flip-flop circuit 2
8 in the NOR circuit NOR _{1 and} the signal determination circuit 2
To an input terminal different from the input terminal to which the output of
The output of the RS flip-flop circuit 28 is input.
Accordingly, as shown in FIG. 3, connects the switch SW ₁ consisting of a push button switch to the input terminal T _4, switch SW
If the input terminal T ₄ is short-circuited by operating ₁ , the NOR circuit NO
The output of the R ₁ is of the L level. At this time, if not made power supply to the load 3, the output of the NOR circuit NOR ₂ is a transistor Q ₁ becomes H level results turned on, power supply to the load 3 is started. Also, the NOR circuit N
Since the output of OR ₁ is maintained at L level, the timer circuit 26 is because it is not activated, the power supply state to the load 3 is being continued regardless of the lapse of time. When operated the switch SW _1, when it is powered to the load 3 by the time limit operation of the timer circuit 26 is not able to turn on the transistor Q _1, the timer circuit 26
Contact r ₁ time limit operation is completed becomes the transistor Q ₁ is turned on when it becomes off, the contact r ₁ is become again turned on immediately after turned off. Therefore, power is supplied to the load 3 almost continuously.

[0014] On the other hand, if you want to stop the power supply to the load 3 during the time limit operation of the timer circuit 26 and, the like want to cancel a state of continuous power to the load 3 by the operation of the switch SW _1. Input circuit 29 for this purpose, the output when the input terminal T ₅ is short-circuited to the H level
And a delay circuit 30 for inverting and delaying a change in the output of the input circuit 29. The output of the input circuit 29 is H
When the level becomes the RS flip-flop circuit 28 described above.
Becomes L level (that is, RS flip-flop).
To release the latch-flop circuit 28) is connected, the output of the delay circuit 30 is input to different input end and the input end the output of the signal determination circuit 24 in the NOR circuit NOR ₁ is input. The delay circuit 30 is set the time constant is large, only when the output of the input circuit 29 becomes H level sequentially certain period of time, to draw the input of the NOR circuit NOR ₁ to L level to turn on transistor Q ₄ It has become. Further, the output of the input circuit 29 is input to different input end and the input end the output of the NOR circuit NOR ₃ in the NOR circuit NOR ₄ is input as a gate.

[0015] Now, when the heat source is not detected by the thermal sensor 1, the output of the signal determination circuit 24 is at the L level, the switch S connected to the input terminal T ₄ at this time
If W ₁ is not operated, the output of the RS flip-flop circuit 28 is at L level, so as shown in FIG.
Switch S is a push button switch connected to an input terminal T ₅
Even if W ₂ and one of the switch SW ₃ is a single turn switch on, change the output of the NOR circuit NOR ₁ is not. Further, since the contact r ₂ is off, the NOR circuit N
The output of OR ₅ is kept in L level, the switch SW _2, S
Changes to latching relay RS by change in the output of the NOR circuit NOR ₄ is caused by the operation of the W ₃ does not occur.

Also, the timer circuit 26 depends on the presence of the heat source.
There when doing limit during operation, since the output of the NOR circuit NOR ₃ is at the L level, the output of the NOR circuit NOR ₄ becomes L level in the period switch SW _2, SW ₃ is turned on. Furthermore, by the contact r ₂ is on, the output of the NOT circuit NOT is because it is L level, which resets the latching relay RS to turn on transistor Q _2, to turn off the contact point r _1, r ₂ You can do it. That is, during the time limit operation of the timer circuit 26, when turning on the switch SW _2, SW _3, despite being limited during operation, than it can be forcibly stop power supply to the load 3 . Here, after the power supply to the load 3 is stopped and during the timed operation of the timer circuit 26,
When the heat source is detected again by the thermal sensor 1,
Since the timer circuit 26 is retriggered, the power supply to the load 3 is restarted. Further, when operating the switch SW ₁ during this period, so that the power supply to the load 3 is continuously performed. That is, these constitute a forced off means.

Next, by turn on the switch SW _1, when it is subjected to a continuous power supply to the load 3,
Since the output of the RS flip-flop circuit 28 is at the H level, the output of the RS flip-flop circuit 28 can be set to the L level by operating the switches SW ₂ and SW ₃ . By performing this operation, the output of the NOR circuit NOR ₁ is L
Since it rises from the H level to the H level, the timer circuit 26
Is started. That is, thereafter, the operation is the same as that during the timed operation of the timer circuit 26 described above, so that the latching relay RS can be reset and the contacts r ₁ and r ₂ can be turned off. In short, if the switches SW ₂ and SW ₃ are operated while the power is continuously supplied to the load 3, the power supply to the load 3 can be stopped.

Since the switch SW ₂ is a push button switch which is turned on only during operation, the switch SW ₂
After operating the the operation of the thermal sensor 1 and the switch SW ₁ is to become effective. However, switch SW ₃
Is a piece cut switch, once until next operation is operated, because is adapted to be held on and turn on the switch SW _3, and the output of the RS flip-flop circuit 28 delays Both the output of the circuit 30 is L
Will be maintained at the level. That is, the operation of the thermal sensor 1 and the switch SW ₁ is not more become disabled, it is possible to keep the force off the power supply to the load 3.

FIG. 2 summarizes the above operation. That is, FIG. 2A shows the state of power supply to the load 3,
(B) the detection state of the heat source by the thermal sensor 1, (c) the operating conditions switch SW _1, (d) the switch SW _2,
A than show the operation state of the SW _3, will be described along the flow of FIG. 2 time, first, when the heat source is detected by the thermal sensor 1 at time t _1, the timer circuit 26
Starts the time limit operation, and tries to continue supplying power to the load 3 during the time limit time t. When the switch SW ₂ at the time limiting the time t ₂ between the time t is operated even during the time limit operation power supply to the load 3 is stopped forcibly. Next, at time t
When operating the switch SW ₁ at _3, it is continuously power to the load 3. By operating the switch SW ₂ at time t ₄ during the feeding period, and stops the power supply to the load 3. Further, at time t ₅ is powered to a heat source is detected load 3 by the thermal sensor 1, the switch S at time t ₆
When continuously stops the power supply to the load 3 by operating the W _3, at time t ₇ feeding thermal sensor 1 to the load 3 be detected heat source is not started. The cancellation of this state, it is sufficient to operate the switch SW _3. Switch S
When performing power supply stop of the operation due to the load 3 of W ₂ may be the timer circuit 28 is to automatically resume the power supply to the load 3 by the detection of the heat source by the thermal sensor 1 even during time limit operation it can.

By the way, as shown in FIGS. 5 to 8, the circuit is a flexible film-shaped wiring board 11c.
Are mounted on the two circuit boards 11a and 11b connected via the. The timer circuit 2 is provided on one circuit board 11a.
A variable resistor VR for adjusting the time constant of 6 is mounted, and a knob F for operating the variable resistor VR is exposed on the upper surface of the body 10. The container body 10 is configured by joining a rectangular parallelepiped body 13 having an open upper surface and a cover 14 fitted to the opening of the body 13 by an assembly screw 15a and a nut 15b screwed to the assembly screw 15a. I have. The circuit boards 11a and 11b are connected to the cover 14 by mounting screws 12 inserted from the lower surface side. In addition, the dimensions of the housing 10 are set to three times the unit dimensions in accordance with the collective dimensions for boards such as a distribution board standardized in JIS standards. Six recesses 17 are formed on both sides of the cover 14 by partitions 16 on each side, and a terminal plate 19 in which a terminal screw 18 is screwed is disposed in each recess 17. You. These terminal plates 19 serve as terminals T ₁ , T ₂ , T ₃ , T ₄ , T ₅ , T
It becomes ₆ .

As described above, since the body 10 is formed to have a contracted size with respect to a board such as a distribution board, it can be arranged in the board and can be easily mounted. By arranging the plurality of controllers 2, the operating states of the plurality of thermal sensors 1 and the load 3 can be collectively managed collectively.

[0022]

According to the present invention as described above, the state of detecting a human by forcibly stopped thermal sensor the power supply to the load and the second input terminal is short-circuited before the power supply time has elapsed Therefore, if a signal is input from the outside even during the power supply time to the load, the operation for forcibly stopping the power supply can be performed. since returning to the state for detecting the in humans, there is an advantage that power supply to the load when detecting a person to the next is started automatically. Moreover, by delaying the short circuit state of the second input terminal by the delay circuit, because while the output of the delay circuit is to invert the output change of the second input circuit to forcibly stop the power supply to the load, If the short-circuit state of the second input terminal continues, the state in which power supply to the load is stopped can be continued. On the other hand, when the short-circuit state of the second input terminal does not continue for a certain period of time, the output of the delay circuit is not inverted and the RS flip- flop circuit is ready to receive the output change of the first input circuit. by will return the person to the state to test <br/> knowledge is. That is, depending on the type of switch connected to the second input terminal, and be returned to the state of detecting a human by the thermal sensor after stopping the power supply to the load, regardless of the detected state of the heat-sensitive sensor It is possible to select to continue the state in which power supply to the load is stopped, and there is an advantage that the usability is good.

[Brief description of the drawings]

FIG. 1 is a circuit diagram of a controller used in an embodiment.

FIG. 2 is an explanatory diagram of an operation of a controller used in the embodiment.

FIG. 3 is a schematic explanatory diagram of an entire configuration showing an embodiment.

FIG. 4 is a schematic configuration diagram showing an arrangement relationship of terminals of a controller used in the embodiment.

FIG. 5 is an exploded perspective view of a controller used in the embodiment.

FIG. 6 is a plan view of a controller used in the embodiment.

FIG. 7 is a longitudinal sectional view of a controller used in the embodiment.

FIG. 8 is a partially cutaway side view of a controller used in the embodiment.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Thermal sensor 2 Controller 3 Load 20 Control circuit 24 Signal discrimination circuit 26 Timer circuit 28 RS flip-flop NOR ₄ NOR circuit

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) H05B 37/00-39/10 G05B 9/02

Claims (1)

(57) [Claims] A thermal sensor for generating a binary signal corresponding to the presence or absence of a person; a controller connected to the thermal sensor via a signal line to turn on and off a load in response to the binary signal from the thermal sensor. the provided, the controller changes a timer means for setting a power supply time to the load starting from the detection of the human that by the thermal sensor, the output and the first input terminal comprises a first input terminal is short-circuited A first input circuit, a second input terminal having a second input terminal for changing the output when the second input terminal is short-circuited, and an output when the output change of the second input circuit continues for a predetermined time. a delay circuit for inverting and a RS flip-flop circuit to release the latching by the output change of the second input circuit latches the output change of the first input circuit, power feeding to when the RS flip-flop circuit is latched state After the end of the power supply, the power supply to the load is forcibly continued, and while the delay circuit inverts the output change of the second input circuit, the power supply to the load is forcibly stopped. while not inverting the output change of the input circuit by the forcibly stopped sensitive sensor power supply to the load and the latch state of the RS flip-flop circuit is canceled human
And a NOR circuit for returning to a state in which the load is detected.