JPH0734552B2 - Power line carrier control device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a power line carrier control device using a wall switch type control terminal capable of superimposing a carrier signal on a commercial power line of a general household and remotely controlling the device. It is about.

2. Description of the Related Art In recent years, various types of power line carrier control systems have been reported in which a commercial power line is used as a transmission path and a load of electric equipment is remotely controlled by transmitting and receiving a control signal composed of a high frequency carrier wave. Among them, a control terminal device that receives a control signal composed of a high-frequency carrier wave superimposed on a power line and controls a load of an electric device or the like connected to the self through a wall switch for supporting an existing house There are some with. This structure is shown in FIG.

In the figure, 1 is a commercial power line of a general household (hereinafter referred to as a power line)
At the same time, it is used as a transmission path for control signals composed of carrier waves while supplying electric power. A push-off switch 2 is connected to the power line 1 and opens when the button is pressed and closes when the button is released, and is mounted on the wall surface of the room. 3 is a load such as a lighting fixture, and a power line 1
It operates by receiving power from. Reference numeral 4 is a control terminal connected to the power line 1 through the push-off switch 2, and controls the load 3 on / off by a control signal from the controller 5 and also controls the load 3 by operating the push-off switch 2. You can In order to control the load 3 by operating the push-off switch 2,
The control terminal 4 has a switching contact therein for reversely controlling the load 3 which is switched by operating the push-off switch 2. Reference numeral 5 denotes a controller connected to the power line 1, which has a function of controlling the load 3 by transmitting a load control command signal composed of a carrier wave to the control terminal 4 via the power line 1 and the push-off switch 2. ing.

The operation of the power line carrier control system configured as described above will be described below. If a transmission request is issued to the controller 5 to turn on the load 3, the controller 5 sends an on-control command signal for the load 3 constituted by a carrier wave to the control terminal 4 on the power line 1. The on-control command signal is transmitted to the control terminal 4 via the contacts of the power line 1 and the bush-off switch 2. Upon receiving this, the control terminal device 4 turns on the load 3 according to this control command. This series of operations is similarly performed when the controller 5 receives a transmission request for controlling the load 3 to be off. Next, the operation of the control terminal 4 when the push-off switch 2 which is a wall switch is operated will be described. The operation of the wall switch is originally performed when it is desired to reverse control the load 3 from the present state, that is, when it is currently on, it is turned off, and when it is off, it is turned on. Therefore, the control terminal 4
When the push-off switch 2 is operated, that is, when the energization to itself is stopped, the load 3 is operated to perform on / off reversal control. The wall switch is used as a push-off switch in order to secure the power supply of the control terminal device 4, and to keep the control terminal device 4 energized at all times except when the wall switch is operated. . Also, while the push-off switch 2 which is a wall switch is being operated, the control terminal 4 is not energized from the power line 1, but during this period, the backup circuit built in the control terminal 4 causes this A power supply for operating the control terminal 4 is secured.

Problems to be Solved by the Invention However, in the above-described configuration, it is not possible to distinguish between the stop of energization due to the operation of the wall switch 2 and the stop of energization due to a momentary interruption or a power failure in the power line 1. There is a problem. That is, similarly to when the wall switch 2 is operated, the load 3 is reversely controlled even when a momentary interruption or a power failure occurs. If the load 3 is a device that generates heat, this may cause a fire or the like, which is extremely dangerous.

The present invention solves such a problem, and can distinguish between a power interruption due to the operation of the wall switch and a power interruption due to a momentary interruption or a power failure that has occurred in the power line, and when the wall switch is operated, the load is reduced. It is an object of the present invention to provide a power line carrier control device capable of performing reversal control from the current state and controlling the load to maintain the current state in the event of a momentary interruption or a power failure.

Means for Solving the Problems In order to achieve this object, a power line control device of the present invention is connected to a power line and sends a carrier wave to the first voltage detection means for detecting a voltage drop of the power line and the power line. A terminal device having a carrier wave transmitting means and a decision control means for inputting the output signal of the first voltage detecting means and driving the carrier wave transmitting means to transmit the carrier wave when the voltage drop period of the power line exceeds a set value; A push-off switch that starts only while it is operated and a push-off switch connected in series to the power line to detect a voltage drop in the power line.
Of voltage detection means, carrier reception means for receiving a carrier wave on the power line, load control means for controlling a load connected on the power line, carrier wave reception means, and output signals of the second voltage detection means as input, and on the power line. When a load control command signal composed of the transmitted carrier wave is received, the load control means is driven to control the load according to the control command,
The load control means changes the state of the load when the second voltage detecting means detects the voltage drop of the power line and when the output of the carrier receiving means detects that the carrier wave is not received during the voltage drop detecting period. And a control terminal having an arithmetic control unit for controlling the.

Operation With the above configuration, it is possible to distinguish between a momentary interruption or power failure that has occurred on the power line and an interruption of power due to the operation of the push-off switch. When the energization is stopped by the operation of the off switch, the power line carrier wave control device is easy to use and the load condition can be reversed from the present condition.

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

FIG. 1 is a block diagram showing an embodiment of the present invention. In the figure, 6 is a power line, which is used as a transmission line for carrier waves as well as supplying commercial power. Reference numeral 7 denotes a terminal device, which compares the voltage of the power line 6 with a set value and detects a momentary interruption or a power failure that has occurred in the power line 6 as a voltage drop of the power line 6, and the first voltage detection unit. When the judgment control means 10 operates according to the detection result of the means 8 and the carrier wave sending means 9 for sending the carrier wave to the power line 6 and the voltage drop period detected by the first voltage detecting means 8 exceed a set value. And a decision control means 10 for driving the carrier wave sending means 9 to send out the carrier wave. Reference numeral 11 is a push-off switch that opens the circuit while the switch is being operated and closes the circuit when the hand is released. Reference numeral 12 is a load such as a lighting fixture.
It is activated by the power supply from the power supply and stopped by stopping the power supply. Reference numeral 13 denotes a control terminal device, which is load control means 14 for switching whether to supply power to the load 12, carrier receiving means 15 for receiving a carrier wave on the power line 6, and second voltage detection for detecting a voltage drop on the power line 6. Means 16 and arithmetic control means 17 are provided.
The arithmetic control unit 17 operates by using the outputs of the carrier wave receiving unit 15 and the second voltage detecting unit 16 as inputs, and when the second voltage detecting unit 16 detects the voltage drop of the power line 6, during the detection period. When the carrier receiving means 15 detects an intermittent carrier, the load controlling means 14 is controlled so as not to change the state of the load 12, and the carrier receiving means 15 also receives the carrier while detecting the voltage drop. If not, the load control means 14 is controlled so that the load 12 is reversely controlled from the present state.

Next, a load control command composed of a carrier wave and a carrier wave sent by the carrier wave sending means 9 of the terminal device 7 will be described with reference to FIG. In the figure, reference numeral 18 denotes a commercial frequency voltage of the power line 6, and reference numerals 19, 20, and 21 denote carrier waves superposed on the commercial voltage, respectively. As a matter of course, the horizontal axis represents time and the vertical axis represents the magnitude of the voltage v. The control command for the load 12 is expressed as a combination of the superimposed phase of the carrier voltage for the commercial voltage, and the superimposed phase is the first half of the peak of the commercial voltage.
If it is T _1, it is set to “1”, and if it is the _second half T _2, it is set to “0”, and a plurality of these signals are combined to form a load control command. That is, in this embodiment, the carrier wave 19 represents "1" and the carrier wave 20 represents "0". The load control command is sent from a controller (not shown). The carrier wave 21 indicates the carrier wave sent by the carrier wave sending means 9 of the terminal device 7. In the case of this figure, the voltage set in the first voltage detection means 8 of the terminal 7 is | V ₁ |, and the voltage reduction period set in the judgment control means 10 is zero. That is, the first voltage detecting means 8 constantly monitors the commercial voltage of the power line 6, and the instantaneous value of this commercial voltage is | V ₁ |
A signal is sent to the judgment control means 10 at the time point below, and the judgment control means 10 operates the carrier wave sending means 9 after 0 seconds until the instantaneous value of the commercial voltage of the power line 6 exceeds | V ₁ | Continue to transmit carrier wave 21. In FIG. 2, since the commercial voltage of the power line 6 has no abnormality such as a momentary interruption or a power failure, the carrier wave 21 is intermittently sent to the power line 6 every half cycle of the commercial frequency.

Next, the operation of the power line carrier control device configured as shown in FIG. 1 will be described.

It is assumed that a control command for the load 12 is generated in a controller (not shown) and a load control command composed of a carrier wave is transmitted to the power line 6. Then, the carrier receiving means 15 of the control terminal device 13 receives this carrier wave, the arithmetic control means 17 decodes this control command, and drives the load control means 14 so as to control the load 12 according to this control command. Thus, the load 12 is controlled according to the control command issued to the controller.

Next, a case where the push-off switch 11 is operated will be described. If the push-off switch 11 is operated, the operating power of the control terminal 13 is secured by the backup circuit incorporated in the control terminal 13, and the second voltage detecting means 16
Detects the voltage drop of the power line 6 due to the operation of the push-off switch 11, and inputs this information to the arithmetic control means 17. At this time, since the power line 6 has no instantaneous interruption or power failure, the carrier wave transmission means 9 of the terminal device 7 intermittently generates a carrier wave for every half cycle of the commercial frequency as described with reference to FIG. This carrier has a push-off switch
Since 11 is operated, it is not received by the carrier receiving means 15. When the push-off switch 11 is operated in this manner, the second voltage detection means 16 of the control terminal 13 only detects the voltage drop of the power line 6 due to the operation of the push-off switch 11, and the carrier wave reception means 15 is detected. It does not receive a carrier wave. The arithmetic control means 17 is a load control means.
14 is driven, and the load 12 is inverted from the current state.

Next, the case where a momentary interruption or a power failure occurs in the power line 6 will be described. In this case, since the built-in backup circuit works for both the terminal device 7 and the control terminal device 13, the first voltage detecting means 8 of the terminal device 7 and the second voltage detecting means 16 of the control terminal device 13 are provided.
Both detect the voltage drop of the power line 6. Since the set time of the judgment control means 10 of the terminal device 7 is 0 second, the carrier wave transmitting means 9 is started from the moment when the first voltage detecting means 8 detects that the voltage of the power line 6 becomes │V ₁ │ or less. Is driven and the carrier wave is continuously transmitted until the voltage of the power line 6 exceeds | V ₁ |, that is, until the momentary interruption or the power failure is recovered. This carrier wave is received by the carrier wave receiving means 15 of the control terminal device 13 via the power line 6. That is, when a momentary interruption or a power failure occurs, the second voltage detecting means 16 of the control terminal unit 13 detects a voltage drop and at the same time the carrier receiving means 15 receives a continuous carrier wave. Then, the arithmetic and control unit 17 identifies that there is a momentary interruption or a power failure, and the load 12
Drives the load control means 14 so as to maintain the current state. In other words, no signal is sent to the load control means 14.

It is to be noted that FIG. 3 shows a configuration diagram when the power line carrier control device of the present invention is implemented as a system for an existing house. This configuration and operation are as described above, and will be omitted.

As described above, the power line control device of the present invention can distinguish between the operation of the wall switch and the momentary interruption or power failure that has occurred in the power line, and when the wall switch is operated, the load is reversed from the current state. However, it does not change the state of the load in the case of a momentary interruption or a power failure, which is very convenient.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of a power line carrier control device of the present invention, and FIG. 2 is an explanation showing an example of data definition of a load control command signal composed of carrier waves in the embodiment and an example of carrier wave output of a terminal. Fig. 3 is a configuration diagram showing an embodiment of a power line carrier control system for existing houses, which is constructed by using the same power line carrier control device, and Fig. 4 shows a conventional power line carrier control system for existing houses. It is a block diagram shown. 6 ... Power line, 7 ... Terminal, 8 ... First voltage detection means, 9 ... Carrier transmission means, 10 ... Judgment control means, 11 ...
... push-off switch, 12 ... load, 13 ... control terminal, 14 ... load control means, 15 ... carrier receiving means, 16 ...
... second voltage detecting means, 17 ... arithmetic control means.

Claims (1)

[Claims] 1. A first voltage detecting means connected to a power line for detecting a voltage drop of the power line, a carrier wave sending means for sending a carrier wave on the power line, and an output signal of the first voltage detecting means as inputs. When the voltage drop period of the power line exceeds a set value, a terminal device having a judgment control means for driving the carrier wave sending means to send out the carrier wave, a push-off switch that opens only when operated, and this push-off switch Second voltage detection means connected to the power line via a series to detect a voltage drop on the power line, carrier receiving means for receiving a carrier wave on the power line, and load control means for controlling a load connected on the power line. When the output signals of the carrier wave receiving means and the second voltage detecting means are input and the load control command signal composed of the carrier wave transmitted on the power line is received, The carrier control means drives the load control means so as to control the load in accordance with a control command, detects a voltage drop of the power line by the second voltage drop detection means, and detects that no carrier wave is received during the voltage drop detection period. A power line carrier control device comprising: a control terminal unit having an arithmetic control unit for controlling the load control unit so as to change the state of the load when detected by the output of the above.