JPH0380399B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a carrier load control device using electric power lines as transmission communication channels.

BACKGROUND OF THE INVENTION In recent years, power line carrier load control systems that use power lines as transmission communication channels to remotely control and monitor various loads (equipment) have begun to become popular due to their benefits of providing comfort and safety in homes. The carrier load control system using electric light lines is commercially available at 100V.
Communication is carried out by superimposing a signal voltage of a sufficiently higher frequency on top of the 50Hz or 60Hz AC voltage of the power line, and since no special wiring is required as a transmission communication path, the time and cost associated with installation is reduced. It has the characteristic that there are few

Here, the power line carrier load control system is composed of a controller and a load control device, and the load control device is a communication means for transmitting and receiving control signals via power lines, and a load control system that controls ON/OFF of the load. means, a control means for controlling these means, and a load control device that controls the load via this control means.
It has input means that can perform ON/OFF control. The controller also has a communication function to send and receive control signals to and from each load control device, a control signal generation function to generate ON/OFF control signals to be transmitted to each load control device, and a control signal generation function to determine whether each load is in an ON or OFF state. It has a monitor display function.

FIG. 3 is a configuration diagram of a conveyance load control system using electric power lines. 1 is a commercial 100V light line that is found in a typical household. A load 2 is connected to the power line 1 via a load control device 3. As described above, the load control device 3 includes communication means, load control means, control means for controlling these, and input means. Reference numeral 4 denotes a controller connected to the power line 1, which has a communication function, a control signal generation function, and a monitor display function as described above, and uses this controller 4 to control a load control device using the power line 1 as a transmission path. By sending and receiving control signals to the load 2, ON/OFF control and monitoring of the load 2 can be performed. Further, the load 2 can also be controlled ON/OFF by the input means of the load control device 3, and the control is not performed only by the controller 4. At this time, since the state of the load 2 is changing, this information is sent from the load control device 3 to the controller 4.

Problems to be Solved by the Invention The load control device 3 in the conventional power line carrier load control system described above either controls the connected load 2 using a control signal from the controller 4, or uses the input means of the load control device 3 itself. If the load control device 3 were to fail, ON/OFF control of the load 2 would become completely impossible. In extreme cases, the entire household load has the disadvantage of being uncontrollable.

The present invention solves this problem, and enables the load to be turned on/off even when the power line carrier load control system fails.
The object of the present invention is to provide a load control device that enables OFF control.

Means for Solving the Problems In order to solve the above problems, the present invention provides a load control means for controlling the load at two locations together with an external three-way switch.

Effects The present invention has the above-described configuration, and even if the load control device fails, the load is controlled at two points, so the load can be controlled together with an external three-way switch, and the system Safety and comfort can be maintained.

Embodiment An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a configuration diagram showing a power line carrying load control device of the present invention. In FIG. 1, a communication means 6 of a load control device 5 is connected to the power line 1, and is controlled by a control means 7. Reference numeral 8 denotes load control means, which is connected to the control means 7 and is controlled to control two locations of the load 10 together with an external three-way switch 9. Reference numeral 11 denotes a load current detection means for detecting whether or not a current is flowing through the load 10, that is, the presence or absence of an energizing current, and its signal is sent to the control means 7.

Now, suppose that a load reversal control signal is output from the controller onto power line 1, which is a transmission communication path.
The signal is received by the communication means 6 of the load control device 5 and sent to the control means 7. The control means 7 uses the load current detection means 11 to determine whether or not current is flowing through the load 10, that is, whether it is ON or OFF. For example, if it is ON, the control means 7 instructs the load control means 8 to turn off the load 10.
issue an order to do so. Naturally, at this time the load 10 is
Since it is turned OFF, this OFF state is detected by the load current detection means 11 and a signal is sent to the control means 7. The control means 7 receives this signal and outputs a state change signal onto the power line 1 through the communication means 6.

Next, the load 10 is turned on by the external three-way switch 9.
When ON or OFF control is performed, a change in the state is detected by the load current detection means 11 of the load control device 5, and a signal is sent to the control means 7. The control means 7 receives this signal and outputs a state change signal onto the power line 1 through the communication means 6. That is, the load 10 is controlled at two locations, with the load control device 5 taking charge of one control and the external three-way switch 9 taking charge of the other control. In such a load control mode, even if one of the loads 10 should fail, the load 10 will not become uncontrollable, and the safety and comfort of the system can be maintained.

FIG. 2 is an electric circuit diagram showing an example of the specific structure and connection of the load control means 8 of the load control device 5 and the three-way switch 9 provided externally. 12 is a relay having single-pole, double-throw contacts; when no current flows through the winding 13, the contacts 14 are closed and the contacts 15 are open. When current flows through the winding 13, the contacts 14 open and the contacts 15 close. One end of this winding 13 is connected to the DC power supply voltage Vcc,
The other end is connected to the collector of the transistor 16,
The emitter is connected to GND. Although the base of the transistor 16 is not shown, the control means 7
It is connected to the. Three-way switch 9 installed externally
consists of a single-pole double-throw switch, with a common terminal 17
is connected to a load 10, and the other end of the load 10 is connected to the ground side of the power line 1. Further, the contact 18 of the three-way switch 9 is connected to the contact 14 of the relay 12, and the contact 19 is connected to the contact 15. A common terminal 20 of the relay 12 is connected to the live side of the power line 1. Here, in the control means 7, ON/OFF of the load 10 is determined by the state of the external three-way switch 9 and the output state of the load control means 8, and it is determined whether the contacts 14 and 15 are ON or OFF. Therefore, the relay 12 is controlled so that the output of the load current detection means 11 is reversed. In addition, electric light line 1
You are free to choose between the live power and grounding sides.

In this configuration, even if the load control device 5 should fail and, as a result, either the contacts 14 or 15 of the relay 12 close, the load 10 is switched to the power line 1 by the external three-way switch 9. It is possible to configure closed circuits and open circuits. In other words, even if the system fails, it is possible to control the load.

In this embodiment, although it is not possible to control the load control device itself, it is easy to provide an operation switch and send this signal to the control means to control the load.

Effects of the Invention As is clear from the above description, according to the present invention, an electrically driven three-way switch is provided in the load control means of the load control device, and the output of the load current detection means is inverted. By controlling the load using a control means and controlling the load at two points in conjunction with an external three-way switch, even if the system fails, the load can be controlled using the external three-way switch, and the system Safety and comfort can be maintained.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of the power line load control device of the present invention, and FIG. 2 is an electrical circuit diagram of the load control means of the same load control device and an external three-way switch.
FIG. 3 is a block diagram of a conventional power line conveyance control device. 1...Light line, 5...Load control device, 6...Communication means, 7...Control means, 8...Load control means,
9...Three-way switch, 10...Load, 11...Load current detection means, 12...Relay.

Claims (1)

[Claims] 1. A communication means that performs communication by superimposing a carrier wave on a power line, a load control means that controls two points of the load together with an external three-way switch, and a load current detection means that detects the presence or absence of current in the load. and control means for controlling the reversal of the load via the load control means so as to invert the output of the load current detection means when the communication means receives a signal to reverse the energization state to the load. Light line conveyance load control device.