JP2000123261A - Slave machine extension unit for heat ray sensing load control system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable a slave machine to be extended regardless of the power source capacity of a master machine. SOLUTION: A slave machine 4 and the slave machine extension unit 3 are connected to a master machine through a signal line S1 and the slave machine 4 is connected to the slave machine extension unit 3 through a signal line S2. When a load control signal from the slave machine 4 is transmitted through the signal line S1, a master machine 1 turns on a lighting load 2. A commercial power source is supplied to the slave machine extension unit 3 through a power source line L1 and the slave machine 4 on a signal line S2 is supplied with the power source from the slave machine extension unit 3. When the slave machine 4 on the signal line S2 detects a human body, the load control signal is transmitted to the slave machine extension unit 3 through the signal line S2, and the slave machine extension unit 3 repeats and transmits the load control signal to the signal line S1. Thus, the master machine 1 can detect the load control signal from the slave machine 4 on the signal line S2 and can turn on the lighting load 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat ray sensing type load control system for detecting the presence or absence of a person in a detection area by detecting a heat ray radiated from a human body and turning on / off a load according to the presence or absence of a person. The present invention relates to a child device extension device.

[0002]

2. Description of the Related Art Conventionally, by detecting a heat ray radiated from a human body using a heat ray sensor such as a pyroelectric infrared sensor, the presence or absence of a person in the detection area of the heat ray sensor is detected. A heat ray sensing type load control system for turning on / off a load according to the presence or absence is disclosed in, for example, Japanese Patent Application Laid-Open No. 6-24335.
No. 7 has been proposed. The heat ray sensing type load control system described in this publication includes a master unit and a slave unit each having a heat ray sensor for sensing a heat ray radiated from a human body, and the master unit and the slave unit are connected via a signal line. Have been.

The master unit is supplied with power from a commercial power supply and connected to a load, and is configured to turn on the load when a person is detected by a hot-wire sensor provided in the master unit. The slave unit is supplied with power from the master unit through a signal line, and is configured to transmit a load control signal to the master unit through the signal line when a person is detected by a hot-wire sensor provided in the slave unit. No load is connected to the slave unit, and the power supplied to the slave unit is supplied by applying a DC low voltage between the signal lines necessary to operate the internal circuit of the slave unit. ing. When a load control signal is transmitted from the child device via the signal line to the parent device, the load is turned on in the same manner as when a person is detected by the hot-wire sensor provided in the parent device. As described above, the load can be turned on regardless of whether a person is detected by either the parent device or the child device, and the detection area of the parent device can be expanded by providing the child device.

[0004]

As described above, since the master unit supplies power to the slave unit, the number of slave units that can be connected to the master unit is limited by the power capacity of the master unit. Will be. The current master unit is designed so that up to two slave units can be connected, and the number of detection areas set is limited to a maximum of three.

[0005] On the other hand, when a lighting load placed in a corridor or the like is used as a load, there are cases where it is required to set the detection area to four or more locations and turn on the lighting load all at once. There is a problem that such requirements cannot be satisfied with the parent device.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and an object of the present invention is to make it possible to increase the number of slave units regardless of the power supply capacity of the master unit and to expand the number of detection areas to be set without limitation. It is an object of the present invention to provide a slave unit adder of a heat ray sensing type load control system.

[0007]

According to a first aspect of the present invention, there is provided a master unit for turning on / off a load when a person is detected by sensing a heat ray radiated from a human body or when a load control signal is received from the outside, When a person is detected by sensing a heat ray radiated from a human body supplied with power through a wire, the slave device is used in a heat ray sensing type load control system including a slave unit that transmits a load control signal to the master unit through the signal line. , Which is inserted on the signal line between the parent device and the child device to insulate the signal line of the parent device and the signal line of the child device, and relays the load control signal generated in the child device to the parent device for transmission. It includes a relay circuit and a power supply circuit that supplies power to the slave through a signal line on the slave side. According to this configuration, the relay unit electrically insulates the master unit and the slave unit from each other, enables a load control signal from the slave unit to the master unit to be transmitted, and transmits the load control signal from the power supply circuit through the slave unit signal line. Since power is supplied to the slave unit, it is possible to supply power to the slave unit regardless of whether or not the master unit supplies power to the slave unit, and the load control signal from the slave unit is supplied to the master unit. Can be transmitted. That is,
It is possible to increase the number of slave units irrespective of the power supply capacity of the master unit, and it is possible to expand the set number of detection areas without limitation.

According to a second aspect of the present invention, in the first aspect of the present invention, the relay circuit detects a load control signal transmitted through a signal line on the slave unit side, and a load detected by the signal detection circuit. A signal output circuit for transmitting a control signal to a signal line on the parent device side, and a photocoupler for transmitting a load control signal is provided between the signal detection circuit and the signal output circuit. This configuration is a specific configuration in which a signal line on the master unit and a signal line on the slave unit are insulated by a photocoupler, and a load control signal can be transmitted.

The invention according to claim 3 is the invention according to claim 1 or 2, wherein the slave unit transmits a load control signal by reducing the voltage applied to the signal line when a person is detected. A power supply circuit that outputs a constant DC voltage using a commercial power supply as a power supply,
And a current limiting circuit that intervenes between the power supply circuit and the signal line on the slave unit side and regulates an upper limit value of a current flowing through the signal line. According to this configuration, the presence or absence of the load control signal can be identified by the voltage change between the state where the DC constant voltage is applied and the state where the voltage is reduced. Further, even if a change occurs in the current flowing through the signal line due to a change in the line voltage of the signal line, the current limiting circuit can prevent an overcurrent from flowing through the signal line.

In a fourth aspect of the present invention, in the first to third aspects of the present invention, a diode bridge for connecting the signal line on the master side in a non-polar manner is provided. According to this configuration, the connection can be performed without considering the polarity of the signal line on the master device side, and the connection work becomes easy.

According to a fifth aspect of the present invention, in the first to fourth aspects of the present invention, a case attachable to a wall surface is provided. According to this configuration, since it can be used by being attached to a wall surface, it is suitable for use with a child device attached to the wall surface.

According to a sixth aspect of the present invention, in the invention of the fifth aspect, the case has a size corresponding to three unit dimensions of an embedded wiring device partly embedded in a wall surface,
A mounting part which can be mounted on a mounting frame provided for mounting the embedded wiring device is formed on both side surfaces of the case. According to this configuration, construction can be performed by applying the same construction technology as the embedded wiring device, and there is no need to newly design construction members or to newly teach construction technology. Accordingly, an increase in cost as a whole can be suppressed. Moreover, since it is a buried type, there are few exposed parts in a construction state and construction can be performed without spoiling the appearance of a construction place.

According to a seventh aspect of the present invention, in the first to fourth aspects of the present invention, there is provided a case which is fixed in contact with the upper surface of the ceiling plate. According to this configuration, since it is disposed on the upper surface side of the ceiling plate, it is suitable for use with a child device attached to the ceiling. Moreover,
Since there are no exposed parts, the appearance of the construction site is not impaired.

[0014]

Embodiments of the present invention will be described below with reference to the drawings.

(Embodiment 1) FIG. 1 (a) is a block diagram of a slave unit extension unit of a heat ray sensing type load control system according to the present invention, and FIG. 1 (b) is a heat ray sensing using a slave unit extension unit. It is a wiring diagram showing an example of construction of a type load control system.

The slave extension unit 3 is interposed in a signal line between the master unit 1 and the slave unit 4 as shown in FIG. 1B, and hereinafter, the master unit 1 and the slave extension unit 3 will be described. The signal line S1 between them is called a signal line on the parent device side, and the signal line S2 on the opposite side of the child device extension device 3 from the parent device 1 is called a signal line on the child device side. In the illustrated example, one slave 4 is connected to the signal line S1 on the master side, and two slaves 4 are connected to the signal line S2 on the slave side. That is, as described above, the current base unit 1 has a conventional configuration.
Since two slaves 4 can be connected, by configuring the slave extension unit 3 to be equivalent to the slave 4 when viewed from the master 1, two masters can be connected to the signal line S1 on the master side. This is equivalent to the case where the slave unit 4 is connected. Since power cannot be supplied from the parent device 1 to the child device 4 connected to the signal line S2 on the child device side, power is supplied from the child device extension device 3. In other words, the problem of insufficient power capacity due to the increase in the number of the slaves 4 is solved by providing the slave extension unit 3. Each slave 4 is formed with terminals so as to enable so-called feed wiring. For example, the slave 4 connected to the signal line S1 on the master side is connected to a signal line between the slave 1 and the master 1. Two sets of signal lines, that is, a signal line between the slave unit and the extension unit 3, can be connected. However, since both signal lines are electrically connected through the slave unit 4, in the following description, the signal line S1 on the master unit side and the signal line S2 on the slave unit side are each treated as one signal line.

The parent device 1 and the child device 4 each include a heat ray sensor such as a pyroelectric infrared sensor. When the heat ray sensor detects a heat ray radiated from the human body, the parent instrument 1 and the child instrument 4 enter a detection area set in advance. Is determined to exist. When the presence of a person is detected by a built-in heat ray sensor in the parent device 1, commercial power is supplied to a load (illumination load in the illustrated example) 2 connected via a load line L2. In addition, child unit 4
When the presence of a person is detected by a built-in heat ray sensor, a load control signal is transmitted to the parent device 1 through signal lines S1 and S2. Master device 1 that has detected the load control signal supplies commercial power to load (lighting load) 2 connected via load line L2, similarly to when a person is detected by a hot-wire sensor built in master device 1. . That is, when a person is detected by either the parent device 1 or the child device 4, commercial power is supplied to the load.

On the other hand, the master unit 1 turns off the lighting load 2 after a certain time from the last time when the person is no longer detected when neither the master unit 1 nor the slave unit 4 detects a person. It is composed. That is, a person is no longer detected by the master 1 and the load control signal from the slave 4 is
Is stopped, the lighting load 2 is turned off after a certain period of time.

As is apparent from the above operation, when a load control signal is generated in the slave unit 4, it must be transmitted to the master unit 1. Therefore, the slave unit extension unit 3 is connected to the signal line S2 on the slave unit side. The load control signal generated in the slave unit 4 is transferred to the signal line S on the master unit side.
1 is provided. Also, it is inconvenient if the power supplied from the parent device 1 to the child device 4 through the parent device signal line S1 is supplied to the child device 4 connected to the child device signal line S2. The signal line S1 on the device side and the signal line S2 on the child device side are electrically insulated.

In order to realize the above-described functions, the child extension unit 3 is configured as shown in FIG. That is,
A configuration in which power is supplied from a commercial power source and supplies power to the slave 4 connected to the slave signal line S2 includes a power supply circuit that superimposes a DC constant voltage on the slave signal line S2. The power supply circuit includes a power supply circuit 10 that outputs a constant DC voltage using a commercial power supply as a power supply, and a current limiting circuit 11 that regulates an upper limit value of a current flowing through the signal line S2. Also,
A relay circuit is provided as a configuration for relaying the load control signal generated by the slave unit 4 connected to the slave unit side signal line S2 and transmitting the load control signal to the master unit side signal line S1. The relay circuit includes a signal detection circuit 12 that detects a load control signal transmitted through the signal line S2 on the slave device side, and a signal line of the signal line S1 on the master device side when the signal control circuit 12 detects the load control signal. And a signal output circuit 13 for transmitting a load control signal to the power supply. A load control signal is transmitted between the signal detection circuit 12 and the signal output circuit 13 but is electrically insulated.

Since it is necessary to connect the power supply line L1 for supplying commercial power, the signal line S1 on the master unit side, and the signal line S2 on the slave unit side to the slave unit extension unit 3, the power line L1 is connected. Power terminal T1, a connection terminal T3 for connecting the signal line S1 on the parent device side, and a connection terminal T2 for connecting the signal line S2 on the child device side.

The structure of the relay circuit in the slave extension unit 3 will be described in more detail. The relay circuit has the configuration shown in FIG. 2. A point A in FIG. 2 corresponds to a point A in FIG. 1B, and is connected to the current limiting circuit 11 and has a DC constant between the grounding point. A voltage (for example, 12 V) is applied. The connection terminal T2 is electrically connected to the point A and the ground point. Therefore, the voltage applied between the signal lines S2 on the slave side connected to the connection terminal T2 is always the output of the current limiting circuit 11. Voltage. When the slave 4 detects the presence of a person, the slave 4 operates to lower the line voltage of the signal line S2 on the slave (for example, to 7.9 V).
The signal detection circuit 12 is configured to detect such a change in the line voltage.

The signal detection circuit 12 includes a Zener diode ZD1 connected between the terminals of the connection terminal T2 and two resistors R
1 and R2. Zener diode ZD
The breakover voltage of 1 is set to a value between the normal line voltage of the signal line S2 on the slave unit side and the line voltage when the slave unit 4 detects a person, and the Zener diode ZD1 is constantly set. Is conducting. Also, of course, the signal line S on the slave unit side
When the slave 4 connected to 2 detects a person, the Zener diode ZD1 becomes non-conductive.

The signal detection circuit 12 includes a transistor Q1 having a base connected to a connection point of the resistors R1 and R2, and a collector of the transistor Q1 is connected to a resistor R3.
A series circuit of the collector-emitter of the transistor Q1 and the resistor R3 is connected between the terminals of the connection terminal T2.
The collector of the transistor Q1 is connected to the base of the transistor Q2, and the resistor R4 is connected between the base and the emitter of the transistor Q2. Also, the transistor Q
2 is connected to a resistor R5 via a light emitting diode PD1, which is a light emitting element of the photocoupler PC1, and a series circuit of the collector-emitter of the transistor Q2, the light emitting diode PD1, and the resistor R5 is connected between the connection terminals T2. Connected.

With this configuration, Zener diode ZD
Since the transistor Q1 is turned on and the transistor Q2 is turned off at all times when 1 is conducting, the light emitting diode PD1 does not turn on and the photocoupler PC1 is kept off. On the other hand, the slave 4 connected to the slave side signal line S2
When a person is detected in the above, the line voltage of the signal line S2 on the slave unit side is reduced, so that the Zener diode ZD1 is turned off, the transistor Q1 is turned off, the transistor Q2 is turned on, and the light emitting diode PD1 is turned on. I do.
That is, the slave 4 transmitted through the slave side signal line S2.
When a load control signal is detected from the photocoupler PC1
Turns on. Note that a surge absorber Z is connected between the connection terminals T2.

The phototransistor PT1 which is the light receiving element of the photocoupler PC1 has a collector connected to a zener diode ZD2. A series circuit of the phototransistor PT1 and the zener diode ZD2 is a diode bridge D.
It is connected between the DC output terminals of B1. A connection terminal T3 for connecting the signal line S1 on the parent device side is provided at an AC input terminal of the diode bridge DB1. That is, the signal output circuit 13 is constituted by the phototransistor PT1, the Zener diode ZD2, and the diode bridge DB1, and the signal detection circuit 12 is constituted by the photocoupler PC1.
And the signal output circuit 13 are electrically insulated. The ground points of the two circuits are different from each other in order to electrically insulate the signal detection circuit 12 and the signal output circuit 13 (the ground point of the signal detection circuit 12 is shown without a mark, and the ground point of the signal output circuit 13 is not shown). Is shown with an asterisk).

In order to transmit a load control signal equivalent to the slave 4, the signal output circuit 13 determines the breakover voltage of the zener diode ZD 2 and the signal line S 2 on the slave side when the slave 4 detects a person. (That is, 7.9 V). On the other hand, the signal line S1 on the parent device side is connected between the terminals of the connection terminal T3. Base unit 1 applies a DC constant voltage (for example, 12 V) between signal lines S1 on the base unit side. When photocoupler PC1 is turned on, the voltage between terminals of connection terminal T3 is a Zener diode. ZD2
, The load control signal can be transmitted to the parent device 1 by this voltage change. Although a DC voltage is applied to the signal line S1 on the parent device side, the connection terminal T3 can be connected without considering the polarity of the signal line S1 on the parent device by providing the diode bridge DB1. it can. That is, the diode bridge DB1 is provided to make the connection polarity of the connection terminal T3 non-polar.

As described above, the signal line S2 on the slave unit side
Power is supplied from the child device adder 3 to the child device 4 through the controller, and when a person is detected in the child device 4, the line voltage is reduced from the line voltage in a standby state where no person is detected, thereby controlling the load. The signal is transmitted to the extension unit 3.
In the slave extension unit 3, when the signal detection circuit 12 detects a change in the line voltage of the signal line S2 on the slave side, the photocoupler PC
1 to transmit a load control signal to the signal output circuit 13;
The signal output circuit 13 transmits the load control signal to the parent device 1 by lowering the line voltage of the signal line S1 on the parent device side.

By the way, in the construction example shown in FIG.
Heat ray sensing type load control system is applied to corridor C,
The three lighting loads 2 are arranged on the upper wall of the corridor C, and one master unit 1 and three slave units 4 are arranged on the wall surface of the corridor C. Further, the child extension device 3 is also arranged on the wall surface of the corridor C, and is arranged adjacent to the child device 4 connected to the signal line S2 on the child device side.

Commercial power is supplied to the main unit 1 through a power line L1, and an illumination load 2 is connected to the main unit 1 as a load via a load line L2. Here, the three lighting loads 2 branch and connect the load line L2. Note that the form in which the load line L2 is branched includes a form in which the lighting load 2 is connected in the middle of the load line L2, and a so-called feed in which each pair of adjacent lighting loads 2 is connected with a different load line L2. There is a form by wiring. Commercial power is supplied to the child extension unit 3 as well as the parent device 1 through the power line L1. In this configuration example, when the presence of a person is detected in any of the four detection areas set by the parent device 1 and the child device 4, the three illumination loads 3 are turned on. Also,
When neither the parent device 1 nor the child device 4 detects a person,
Lighting load 2 after a certain period of time from the last detection of a person
Turns off.

As described above, by providing the extension units 3, power to the extension units 4 is supplied from the extension units 3, and any number of extension units 3 can be provided. The number of slaves 4 can be increased irrespective of the power supply capacity of master 1. In addition, since the slave extension unit 3 relays the load control signal from the slave 4 and transmits the load control signal to the master 1, all the slaves 4 can be handled by one system. In other words, it is possible to provide any number of slave units 4 for controlling the load of one system, and it is possible to arbitrarily increase the number of set detection areas.

The extension device 3 used in the present embodiment.
Has a structure shown in FIG. 3 so that it can be mounted on a wall by the same construction method as an embedded wiring device. That is, the case 20 of the child extension device is formed by combining a rectangular parallelepiped body 21 having an open front surface (the upper surface in FIG. 3) and a cover 22 which is covered by the front opening of the body 21. The body 21 and the cover 22 are engaged with engagement holes (not shown) formed at key points (four places) of the peripheral wall of the body 21 so as to protrude toward the body 21 on the periphery of the cover 22. The engagement is performed by engaging the claws 23. In addition, FIG.
The circuit board 24 on which the circuit shown in FIG.

On the circuit board 24, six terminal boards 25 constituting a power terminal T1, a connection terminal T2 and a connection terminal T3 are mounted. Each terminal plate 25 has a locking spring 26 and a release button 27.
Together with it constitutes a quick connection terminal. An electric wire insertion opening (not shown) is opened on the rear surface of the body 21, and the electric wire inserted from the electric wire insertion opening is sandwiched between the terminal plate 25 and the locking spring 26. That is, the locking spring 26 is formed by bending both ends of a strip made of a spring material, and the locking piece 26a is inclined toward the terminal plate 25 in the direction in which the electric wire is inserted, and the locking spring 26 is And a resilient contact piece 26b.
The electric wire inserted through the electric wire insertion port is sandwiched between the locking piece 26a and the contact piece 26b and the terminal plate 25, and the leading edge of the locking piece 26a bites into the electric wire to prevent the electric wire from coming off. It has become. Release button 2
The lock piece 26a is pressed by a tool (such as the tip of a driver) inserted into the body 21 through a button operation hole (not shown) opened on the rear surface of the body 21.
Is pressed in a direction in which it is separated from the terminal plate 25, and the locked state of the locking piece 26a with respect to the electric wire is released, so that the electric wire can be easily pulled out.

The case 20 is formed to have three module dimensions (three unit sizes) of the large-angle continuous wiring equipment standardized for embedded wiring equipment in the JIS standard. That is, one case 20 can be attached to the three attachment frames 30 used for wiring equipment construction. The illustrated mounting frame 30 is made of metal,
A pair of holding claws 34 project inward from the inner peripheral edge of the opening window 36, and an operation hole 35 is formed in the mounting frame 30 near the holding claw 34.

Two holding holes 28 are formed on both side surfaces of the projecting stand 29 projecting from the front part of the case 20 so as to be attachable to the attachment frame 30 respectively. When the protruding base 29 is inserted into the opening window 36 of the mounting frame 30, the positions of the holding holes 28 and the holding claws 34 correspond to each other.
When the periphery of the holding claw 34 in the mounting frame 30 is plastically deformed so that a tool (such as the tip of a screwdriver) is inserted into the holder 5 and the holding claw 34 is inserted into the holding hole 28, the mounting frame 30
Can be combined with the case 20.

An elongated box fixing hole 31 into which a box screw to be screwed into an embedded box such as a switch box is inserted, and a decorative plate for covering the front side of the mounting frame 30 is mounted on the mounting frame 30. A plate fixing hole 32 which is a screw hole into which the plate screw is screwed, and a clip holding hole 33 for hooking a clip (not shown) are formed. One end of the clip is hooked into the clip holding hole 33, and a screw inserted through the box fixing hole 31 is screwed into the clip. The distance from the frame 30 is reduced. Therefore, the clamp is inserted into the mounting hole formed in the wall panel, and the mounting frame 30 is inserted into the surface of the wall panel.
When the screw is tightened in a state where the abutment is in contact, the peripheral portion of the mounting hole formed in the wall panel is sandwiched between the mounting frame 30 and the clamp, and the mounting frame 30 can be fixed to the wall panel. . Further, by inserting a tapping screw screwed into the wall surface into the box fixing hole 31, the mounting frame 30 can be directly attached to the wall surface. In any case, Case 2
0 means that a part is embedded in the wall.

As described above, the slave adder 3 of the present embodiment
Can be mounted on a wall using the mounting frame 30 standardized for wiring equipment, so that it can be installed in the same installation method as wiring equipment using the same installation members as wiring equipment, Construction becomes easy.

(Embodiment 2) In this embodiment, as shown in FIG. 4, a master unit 1 and a slave unit 4 are arranged on the ceiling surface of a corridor C. 5 is formed in the structure shown in FIG. The construction example shown in FIG. 4 has the same configuration as that of the first embodiment except that the configurations of the parent device 1, the child device extension device 3, and the child device 4 are different and the mounting location is different. Are denoted by the same reference numerals and description thereof is omitted.

As shown in FIG. 5, a case 40 of the child extension device 3 used in the present embodiment has a rectangular parallelepiped body 41 having an open upper surface, and a cover 42 which is covered by the upper opening of the body 41. And formed by combining Body 4
The cover 1 and the cover 42 are connected to each other by screwing a connection screw 45 inserted through the cover 42 into connection holes 43 formed at two (two) locations on the peripheral wall of the body 41. A circuit board 46 on which the circuit section shown in FIG. 1A is mounted is provided in the case 40. This case 40
May be simply placed on the upper surface of the ceiling plate, but may be fixed by using a double-sided adhesive sheet as needed.

The power supply terminal T1 and the connection terminals T2 and T3 in this embodiment are threaded terminals having terminal screws 47. The terminal screws 47 are attached to a terminal plate 49 held on a terminal block 48 provided on the cover 42. It is screwed. Other configurations and operations are the same as those of the first embodiment, and thus description thereof is omitted.

[0041]

According to the first aspect of the present invention, there is provided a master unit which detects a person by sensing a heat ray radiated from a human body or turns on / off a load when a load control signal is received from the outside, and a signal line. Used in a heat ray sensing type load control system including a slave unit that transmits a load control signal to a master unit through a signal line when a person is detected by sensing a heat ray radiated from a human body supplied with power, and the master unit and a child unit are used. A relay circuit that is inserted on a signal line between the slave device and insulates the signal line on the master device side and the signal line on the slave device side, and relays and transmits a load control signal generated by the slave device to the master device; A power supply circuit for supplying power to the slave through a signal line on the container side,
The relay circuit electrically insulates the master unit and the slave unit from each other, enables transmission of load control signals from the slave unit to the master unit, and supplies power to the slave unit from the power supply circuit through the slave unit signal line. Power supply to the slave unit regardless of whether the master unit supplies power to the slave unit or not, and the load control signal from the slave unit can be transmitted to the master unit. is there. As a result, it is possible to increase the number of slave units irrespective of the power supply capacity of the master unit, and there is an advantage that the number of setting locations of the detection area can be expanded without limitation.

According to a second aspect of the present invention, in the first aspect, the relay circuit detects the load control signal transmitted through the signal line on the slave unit side, and the load control signal detected by the signal detection circuit. A signal output circuit for transmitting a signal to a signal line on the master device side, and a photocoupler for transmitting a load control signal is provided between the signal detection circuit and the signal output circuit; The signal line and the signal line on the slave unit side are insulated by a photocoupler, and the load control signal can be transmitted.

According to a third aspect of the present invention, in the first or second aspect of the present invention, when a person is detected as a child unit, a voltage applied to a signal line is reduced to transmit a load control signal. A power supply circuit that outputs a constant DC voltage using a commercial power supply as a power supply, and a current limiting circuit that intervenes between the power supply circuit and the signal line on the slave unit and regulates an upper limit value of a current flowing through the signal line. The presence or absence of a load control signal can be identified by the voltage change between the state where the DC constant voltage is applied and the state where the voltage is reduced, and the line voltage of the signal line is determined. Even if the current flowing through the signal line changes with the change, there is an advantage that the current limiting circuit can prevent an overcurrent from flowing through the signal line.

According to a fourth aspect of the present invention, in the first to third aspects of the present invention, there is provided a diode bridge for connecting the signal line of the master unit to the non-polarity, and the polarity of the signal line of the master unit is changed. There is an advantage that the connection can be made without consideration and the connection work becomes easy.

According to a fifth aspect of the present invention, in the first to fourth aspects of the present invention, there is provided a case which can be mounted on a wall surface, and can be used by mounting on a wall surface. It has the advantage of being suitable for use with.

According to a sixth aspect of the present invention, in the fifth aspect of the present invention, the case has a size corresponding to three unit dimensions of an embedded wiring device whose part is embedded in a wall surface. The mounting parts that can be attached to the mounting frame provided for mounting the embedded wiring equipment use those formed on both sides of the case, and apply the same construction technology as the embedded wiring equipment. This eliminates the need to design new components for construction or educate new construction techniques, and has the advantage of suppressing the overall cost increase. Since it is a built-in type, there is an advantage that it is possible to perform the construction without impairing the appearance of the construction place with few exposed portions in the construction state.

According to a seventh aspect of the present invention, in the first to fourth aspects of the present invention, there is provided a case which is fixed so as to be in contact with the upper surface of the ceiling plate, and is arranged on the upper surface side of the ceiling plate. Therefore, it is suitable for use with a child unit attached to the ceiling, and furthermore, there is an advantage that the appearance of the construction place is not impaired because there is no exposed portion.

[Brief description of the drawings]

FIGS. 1A and 1B show a first embodiment of the present invention, in which FIG. 1A is a block diagram, and FIG. 1B is a wiring diagram showing a construction example.

FIG. 2 is a specific circuit diagram of the above.

FIG. 3 is an exploded perspective view of the same.

FIG. 4 is a wiring diagram illustrating a construction example according to a second embodiment of the present invention.

FIG. 5 is an exploded perspective view of the same.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 parent device 2 lighting load 3 slave device extension device 4 slave device 10 power supply circuit 11 current limiting circuit 12 detection signal detection circuit 13 signal output circuit 20 case 30 mounting frame 40 case PC1 photocoupler

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Tatsuya Abe 1048 Kazuma Kadoma, Kadoma-shi, Osaka F-term in Matsushita Electric Works Co., Ltd. GG57 GG66 GG68 HH08 5C087 AA12 AA23 BB03 DD05 DD20 DD33 EE12 FF01 FF03 FF04 FF10 FF12 GG09 GG30 GG38 GG52 GG55 GG65 GG69 GG73

Claims (7)

[Claims] 1. A base unit for detecting a person by sensing a heat ray radiated from a human body or turning on / off a load when a load control signal is received from an external source, and a power supply supplied through a signal line to radiate from the human body. When a person is detected by sensing a heat ray to be transmitted, a child device that transmits a load control signal to the parent device through the signal line is used in a heat ray sensing type load control system, and a signal between the parent device and the child device is used. The relay circuit is inserted on the cable to insulate the signal line on the master unit and the signal line on the slave unit, and relays the load control signal generated by the slave unit to the master unit and transmits it. And a power supply circuit for supplying power to the slave unit. 2. The relay circuit includes: a signal detection circuit that detects a load control signal transmitted through a signal line on a slave unit side;
A signal output circuit for sending a load control signal detected by the signal detection circuit to a signal line on the master device side, and a photocoupler for transmitting the load control signal is provided between the signal detection circuit and the signal output circuit. The extension unit for a heat ray sensing type load control system according to claim 1, wherein: 3. The slave unit detects a person and transmits a load control signal by reducing a voltage applied to a signal line, and the power supply circuit outputs a constant DC voltage using a commercial power source as a power source. 3. The circuit according to claim 1, further comprising a circuit, and a current limiting circuit that is interposed between the power supply circuit and the signal line on the slave unit side and regulates an upper limit value of a current flowing through the signal line. An extension unit for a heat-sensing load control system. 4. The apparatus according to claim 1, further comprising a diode bridge for connecting the signal line on the master unit side in a non-polar manner.
A slave unit adder of the heat ray sensing type load control system according to claim 3. 5. The extension unit for a heat ray sensing type load control system according to claim 1, further comprising a case attachable to a wall surface. 6. The mounting case has a size corresponding to three unit dimensions of an embedded wiring device partly embedded in a wall surface, and is provided for mounting the embedded wiring device. 6. An extension unit for a heat ray sensing type load control system according to claim 5, wherein attachment portions attachable to a frame are formed on both side surfaces of said case. 7. The extension unit for a heat ray sensing type load control system according to claim 1, further comprising a case fixed to be in contact with an upper surface of the ceiling plate.