JPH0614364A - Control terminal equipment for remote supervisory and control system - Google Patents

Abstract

PURPOSE:To eliminate restriction of the number of control terminal equipment and current consumption and to prevent a transmission signal from being affected by them. CONSTITUTION:This control terminal equipment is provided with a power supply circuit 14 for feeding power from a commercial power supply. A receiving circuit 11 and a returning circuit 12 for transmitting signal from/to a central control device through a signal lines are mutually separately connected to a transmission processing circuit 13 for executing receiving processing or returning control. Since power supply is obtained not from a transmission signal transmitted through the signal line but from power supply applied from the commercial power supply, a signal line side current can be prevented from being affected by a control terminal side current.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control terminal device for controlling the operation of a load of a remote monitoring control system.

[0002]

2. Description of the Related Art A remote monitoring control system is used for remotely monitoring and controlling the operation of lighting, air conditioners and the like.
An example of this remote monitoring and control system is shown in FIG. In this remote monitoring and control system, a central controller 1 and a plurality of monitoring terminals 2 for monitoring the operating states of the switches S _{1 to} S ₄ ,
And the control terminal 3 for controlling the loads L _{1 to} L ₄ are connected by a pair (two lines) of signal lines 4, and the central controller 1 and each of the terminals 2 and 3 are connected via the signal line 4. Signal transmission.
Here, a unique address is set for each of the terminals 2 and 3.

As shown in FIG. 5, the transmission signal V _S sent from the central control unit 1 to the signal line 4 is a start pulse ST indicating the start of transmission and mode data M indicating the signal mode.
D, address data AD indicating addresses of the terminals 2 and 3 to be accessed, control data CD indicating control contents for controlling the loads L _{1 to} L ₄ , checksum data CS, and a return signal from the terminals 2 and 3 are returned. And a return signal period WT provided for that purpose. This transmission signal V _S is time-division multiplexed transmission as a pulse width modulated bipolar (± 24 V) signal.

[0004] Each terminal unit 2, usually, when the unique address of the address data and the self-transmission signals V _S which is received via the signal line 4 is matched, the control data of the transmission signal V _S At the same time as capturing, the monitoring data is returned to the central control unit 1 as a current-mode return signal by making the signal lines 4 short-circuited in synchronization with the return signal period WT of the transmission signal V _S.

However, for example, the switch S₁~ S_FourIs operated
When the load strikes, the load L immediately responds ₁~ L_FourMotion control
The following interrupt processing is performed so that Now either
Switch S of terminal 2₁~ S_FourIf is operated,
The terminal 2 is a transmission signal transmitted from the central controller 1.
5B in synchronization with the start pulse ST of FIG.
The embedded signal Vi is returned to the central controller 1. This interrupt
The central control unit 1 which has received the signal No.
2 is specified, the terminal 2 is accessed, and the monitoring data is
Send it back. And based on the returned monitoring data
Corresponding load L ₁~ L_FourTo the control terminal 3 for controlling
Create control data to control and control to the corresponding control terminal 3.
Send data. In this way urgent processing is quick
I can do it.

[0006]

By the way, in the control terminal unit 3 of the above remote monitoring control system of this type, the transmission signal transmitted through the signal line 4 is rectified and smoothed to obtain a power source. . In this case, if the current consumption of the control terminal device 3 is large, the current capacity that can be supplied from the central control device 1 to the control terminal device 3 is limited, so the number of connectable control terminal devices 3 and the current consumption are restricted. There was a problem of receiving.

Further, when power is obtained from the transmission signal, if the control terminal 3 controls the operation of the load L by using a relay, the current consumption of the control terminal 3 increases momentarily. However, there is a problem that stable transmission of the transmission signal cannot be performed. Further, in order to prevent the reset circuit provided as a peripheral circuit of the control circuit formed by the CPU that controls the operation of each part and the signal processing from working against the momentary power failure, a capacitor that holds the power supply during the momentary power failure is used. is necessary. However, when a large number of control terminals 3 are connected, the transmission signal has a dull waveform, and there is a problem that normal signal transmission cannot be performed.

The present invention has been made in view of the above points, and an object of the present invention is not to be restricted by the number of control terminals and current consumption, and not to affect a transmission signal. It is to provide a control terminal for a remote monitoring control system.

[0009]

In order to achieve the above object, the present invention comprises a power supply circuit for producing a power supply from a commercial power supply, and performs signal transmission with a central control unit via a signal line. The circuit and the return circuit are isolated from each other and are connected to a transmission processing circuit that performs reception processing or return control.

When the load is a lighting load and a heat generating component such as a phase control element for phase controlling the lighting load is provided, the heat of the heat generating component is efficiently dissipated to protect the electric component from heat. For this purpose, the cover forming the housing is formed of a metal having good heat dissipation, and a heat dissipation plate attached in close contact with the cover is provided, and an opening for heat dissipation that radiates internal heat can be formed in the cover. preferable.

Further, the outer dimensions of the housing may be formed into eight modules having a distribution board agreement size corresponding to the case of being housed in the distribution board. Furthermore, if the load is a lighting load and a phase control element that controls the phase of this lighting load is provided and a relay contact is connected in series with this phase control element, the load current can be completely cut off.

[0012]

The present invention has the above-mentioned configuration,
The power supply is not obtained from the transmission signal transmitted through the signal line, but is obtained from the commercial power supply to prevent the current on the control terminal side from affecting the current on the signal line side. The transmission signal is not affected, without being restricted by the number of devices and current consumption.

[0013]

1 to 3 show an embodiment of the present invention. The control terminal 3 of the present embodiment controls the operation of a lighting load as the load L, and can perform dimming control as well as on / off control of the lighting load L. The control terminal 3 is roughly divided into a transmission block that performs signal transmission with the central control device 1, and a lighting control block that controls lighting of the lighting load L under the control of this transmission block. There is.

As shown in FIG. 1, the transmission block is basically a receiving circuit 11 for receiving a transmission signal from the central control unit 1 and a return circuit 12 for transmitting a return signal to the central control unit 1. And a transmission processing circuit 13 including a CPU that performs signal processing according to the transmission signal received by the receiving circuit 11 and transmission control of a return signal via the return circuit 12, and a power source from a commercial power source (AC100V) And a power supply circuit 14 for supplying power to the circuit of a lighting control block described later.

Here, in the conventional case, the power source is normally generated from the transmission signal transmitted through the signal line 4, but in the case of the present embodiment, the power source is obtained from the commercial power source. In other words, in the power supply circuit 14, the step-down output (AC24V) by the power supply transformer T
₂ is rectified, and the rectified output is made into a constant voltage using a plurality of constant voltage circuits to supply power to each part.

Further, in the case of the present embodiment, the receiving circuit 11
Also, photocouplers PC ₁ and PC ₂ are provided between the return circuit 12 and the transmission processing circuit 13, and the photocoupler P ₁ and PC ₂ are provided.
The signal line 4 side and the transmission processing circuit 13 side are electrically insulated by C ₁ and PC ₂ . In this way, the control terminal 3
The current consumption for driving the lighting load L can be increased regardless of the current capacity supplied via the signal line 4. Further, when the lighting load L is turned on and off, even if the current increases momentarily, the influence does not reach the signal line 4 side, so that the transmission of the transmission signal is not affected.

By the way, if the receiving circuit 11 and the return circuit 12 are insulated as described above, the power supply for the circuit section on the signal line 4 side is necessary, so the power supply for the circuit section is created from the rectified output of the diode bridge DB _1. A power supply circuit 15 is provided. In addition, the power supply circuit 15 is the same as the receiving circuit 11 described above.
Since it is sufficient to supply the power to only a part of the circuit of the return circuit 12, the current capacity is small, and the central controller 1 is burdened with the current capacity and adversely affects the transmission signal. There is almost no such thing.

By the way, C which constitutes the transmission processing circuit 13
In a PU or the like, a reset circuit 16 is provided for this purpose because it is necessary to reset the system when it is activated. Conventionally, in order to prevent the reset circuit 16 from operating during an instantaneous power failure, the capacity of a capacitor included in a power supply circuit that creates a power supply from a transmission signal is increased and the reset circuit 16 is instantaneously charged by the charge accumulated in the capacitor. It prevented it from operating during a power failure. Therefore, there is a problem that the transmission signal becomes dull due to the capacitor. However, in the case of the present embodiment, since the power supply circuit 15 generates power from the commercial power supply, the capacitor of the power supply circuit 15 is not connected to the signal line 4. There is no problem even if it is increased.

In this transmission block, address setting or address change can be performed wirelessly using an optical signal by an address setting device. For this reason,
A transmission circuit 17 and a reception circuit 18 for transmitting / receiving an optical signal to / from the address setting device are provided, and the address transmitted from the address setting device is stored in a storage unit 19 composed of an EEPROM. The transmission processing circuit 13 including a CPU operates based on the clock signal of the clock generation circuit 20, and the operation state is determined by the light emitting diode LD.
₂ is turned on and displayed.

In the lighting control block, the dimming lighting control of the lighting load L is performed by controlling the conduction angle of the triac Q ₀ as a phase control element inserted in series between the commercial power source and the lighting load L. , it performed on the illumination load L, and off control of the contact r ₁ of the latching relay Ry ₁ is inserted in series with the triac Q _0. Incidentally, this is the power supply side of the triac Q ₀ is provided with a filter circuit 27 for noise caused by a switching of the triac Q ₀ is prevented from leaking to the commercial power supply side and by using a toroidal coil as the coil L of the filter circuit 27 .

On / off control and dimming control of the lighting load L are performed by the dimming control circuit 21 composed of a CPU, and the dimming control circuit 21 is controlled by the transmission processing circuit 13.
That is, the transmission processing circuit 13 gives control data to the dimming control circuit 21, and the dimming control circuit 21 turns on the two-winding latching relay Ry ₁ via the drive circuits 23 and 24 in accordance with the control data. , Off control and triac Q
Phase control by ₀ is performed. The drive circuits 23 and 24 are isolated from the commercial power source side by photocouplers PC ₃ and PC ₄ .

Here, the phase of the power source supplied to the commercial power source
In order to perform control, the zero cross point of the commercial power source is detected.
Need to Therefore, the zero-cross detection circuit 22 is installed.
Dimming in synchronization with the output of this zero-cross detection circuit 22
Control circuit 21 is triac Q ₀Control the conduction angle of
The power supplied to the light load L is adjusted. By the way
The dimming control state is fully raised and supplied to the lighting load L.
The lighting load L is practically turned off when the power consumption is reduced to the minimum.
It is done. However, using such a phase control element
For dimming control, fill the dimming control state as described above.
Even if it is raised, the power supplied to the lighting load L is completely cut off.
It is impossible to do so, and a slight current flows through the lighting load L.
Therefore, in order to cut off this current completely, latching
Relay Ry₁Contact point r₁Triac Q₀In series with
It continues.

As the latching relay Ry ₁ , one that can control the operation of an incandescent lamp load having a maximum load capacity of 1500 W is used. In the conventional control terminal device 3 of this type, due to current capacity restrictions on the side of the central control device 1,
The single control terminal 3 could control the dimming lighting only up to 800W. Therefore, when a large number of incandescent lamps exceeding 800 W are to be dimmed and lit, a group of lighting loads L that fit within 800 W must be dimmed and lit by a plurality of control terminals 3. Load L
It was not possible to control the dimming lighting smoothly in a batch.

However, when the power source for the dimming lighting block is obtained from the commercial power source as in the present embodiment, there is no current capacity limitation on the side of the central control unit 1, so that more lighting loads L are collectively controlled. It can be turned on with light and is highly practical.
Further, as a peripheral circuit of the dimming control circuit 21, a reset circuit 2 for resetting the dimming control circuit 21 based on the outputs of the clock generating circuit 25 and the reset circuit 16.
6 and 6. The second contact r ₂ from switching state of the latching relay Ry _1-on latching relays Ry _1, the off state, that is, are to be determined lighting of the lighting load L, and off state.

By the way, with the lighting load L dimmed and turned on, the lighting load L is adjusted by using the latching relay Ry _1.
May go out. At this time, when turning off the lighting load L, the dimming control state is taken into the ROM incorporated in the dimming control circuit 21, and when the lighting load L is turned on next, based on the dimming control data. The lighting load L is turned on.

The appearance of the control terminal 3 of this embodiment is shown in FIG. As shown in FIG. 2, the housing 30 of the control terminal 3 includes a box-shaped body 31 having an open upper surface, and a box having an open lower surface that is screwed to the opening side of the body 31 using a mounting screw 43. And a cover 32 in the shape of a circle.
Here, the body 31 is made of synthetic resin, and the cover 32 is made of metal (iron). The outer dimensions of the housing 30 are formed in a size of 8 modules as a distribution board agreement size, and are installed in the distribution board using a connecting plate used when an electromagnetic relay or the like is installed in the distribution board. I can do it. Here, mounting grooves 33 are formed on both side surfaces of the body 31 so that the connecting plate can be used to construct the distribution board.

A lighting load L is provided on both sides of the housing 30.
Also, a terminal portion 34 for connecting the commercial power source and a terminal portion 35 for connecting the signal line 4 are provided. Each terminal portion 34, 3
Reference numeral 5 denotes a terminal block 41 made of an insulating material, which is mounted by screwing screws 39 to the mounting pieces 32a formed at both ends of the opening 42 formed at the center of both sides of the cover 32, and is mounted on this terminal block 41. It comprises a connection terminal 40. Here, the terminal block 41 has a structure in which the upper part and the lower part are opened, and the portion for accommodating each connection terminal 40 is divided into a plurality of sections. Further, the connection terminal 40 is a substantially L-shaped terminal plate 40a.
And a terminal screw 40b with a washer that is screwed to the screwing piece on the upper portion of the terminal plate 40a.

By the way, on the terminal portion 34 side, the mounting bracket 37 is mounted together with the terminal block 41 by using the screw 39.
The terminal portion 34 is insulated by screwing it to a and attaching the terminal cover 36 to the mounting bracket 37. Inside the body 31, a printed circuit board 44 on which the electric components that make up the circuit described above are mounted is housed. A heat radiating plate 47 that radiates heat, such as a triac Q ₀ and a coil L, which are heat generating components, is attached to the printed circuit board 44 with screws 45. The triac Q ₀ is attached to the heat radiating plate 47 via the mounting plate 46 by screwing. Here, the heat dissipation plate 47 is attached to the cover 32 with screws 48, and the printed circuit board 45 is attached to the heat dissipation plate 47.

The cover 32 is made of a metal having a good heat dissipation property as described above, so that the cover 32 and the heat dissipation plate 47 can dissipate the heat of the triac Q _{0 and the} like, and the heat is accumulated on a plurality of surfaces inside the housing 30. A large number of slits 50 are provided to prevent this. If you do this,
The heat of the heat-generating component can be efficiently released. In addition,
The contact area between the heat dissipation plate 47 and the cover 32 is made as large as possible to improve the heat dissipation effect. General electronic parts may exceed the operating temperature range due to the heat, and it has been difficult to cope with it by using a large heat dissipation device such as a heat dissipation fin.However, if the heat dissipation structure of the present embodiment is adopted, , Does not cause such a problem.

Light emitting diode L of the transmitting / receiving circuits 17 and 18
The D ₁ and the photodiode PD ₁ are provided on the printed circuit board 44.
Mounted on the child board 44a standing upright, facing the transmission / reception windows 51 and 52 formed on the heat dissipation plate 47 and the cover 32, and covering the light emitting diode LD ₂ for operation display with the cover 3
It is exposed through the two insertion holes 53. Since the transmission / reception with the address setting device is performed using infrared rays, an infrared filter 54 is attached to the transmission / reception window 51, and a nameplate 55 is attached thereon.

[0031]

As described above, the present invention is provided with the power supply circuit for producing the power supply from the commercial power supply, and isolates the receiving circuit and the returning circuit which perform the signal transmission with the central control unit through at least the signal line. Since it is connected to a transmission processing circuit that performs reception processing or return control, the power is not obtained from the transmission signal transmitted through the signal line, but is obtained from the commercial power source and the signal line side The current on the control terminal side is prevented from affecting the current, the number of control terminals and current consumption are not restricted, and the transmission signal is not affected.

Further, when the load is a lighting load and a heat generating component such as a phase control element for controlling the phase of the lighting load is provided, the cover forming the housing is formed of a metal having a good heat dissipation property and is closely attached to the cover. If the cover is equipped with a heat dissipation plate and the cover has an opening for heat dissipation that dissipates the internal heat, the heat of the heat-generating components can be efficiently dissipated, and the heat of the electrical components is protected. be able to.

Further, since the load is a lighting load and a phase control element for controlling the phase of this lighting load is provided and a relay contact is connected in series with this phase control element, the interruption of the load current is interrupted by the relay contact. The load current can be completely cut off by compensating for the point that the load current cannot be completely cut off by the phase control in which the conduction angle of the phase control element is controlled.

[Brief description of drawings]

FIG. 1 is a circuit diagram of a control terminal according to an embodiment of the present invention.

FIG. 2 is an exploded perspective view showing the structure of the above.

3A to 3C are a plan view, a side view and a front view showing the appearance of the same.

FIG. 4 is a system configuration diagram of a remote monitoring control system.

FIG. 5 is an explanatory diagram showing a format of a transmission signal of the above.

[Explanation of symbols]

1 Central Control Unit 3 Control Terminal 4 Signal Line 11 Receiving Circuit 12 Returning Circuit 13 Transmission Processing Circuit 14 Power Supply Circuit 30 Housing 32 Cover 47 Heat Sink 50 Slit L Load Q ₀ Triac r ₁ Contact

Claims (4)

[Claims] 1. A plurality of terminal units are connected to a central control unit via two signal lines, and each central unit is individually specified by specifying the terminal unit with a unique address set by address data of a transmission signal. Access to the terminal device to control the lighting load operation according to the control data set in the transmission signal, and monitoring data indicating the operating status of the lighting load from the terminal device during the return signal period provided in the transmission signal. It is a control terminal unit of a remote monitoring control system that returns and monitors the operating status of the lighting load.It is equipped with a power supply circuit that creates power from a commercial power supply, and transmits signals to and from the central control unit via signal lines. In a form in which the receiving circuit and the returning circuit that perform
A control terminal unit of a remote monitoring and control system, characterized in that the control terminal unit is connected to a transmission processing circuit for performing reception processing or return control. 2. When the load is a lighting load and a heat generating component such as a phase control element for controlling the phase of the lighting load is provided, the cover forming the housing is made of metal having good heat dissipation and is close to the cover. 2. A heat dissipation plate attached in a form that allows the cover to have a heat dissipation opening for radiating internal heat.
A control terminal for the remote monitoring and control system described. 3. The control terminal of the remote monitoring and control system according to claim 2, wherein the outer dimensions of the housing are formed into eight modules having a distribution board agreement dimension. 4. The remote according to claim 1, wherein the load is a lighting load, a phase control element for controlling the phase of the lighting load is provided, and a relay contact is connected in series with the phase control element. Control terminal of supervisory control system.