JPH05325774A - Demand receptacle device - Google Patents

Abstract

PURPOSE:To provide a safe demand receptacle device preventing the rated current or above from flowing in a receptacle without requiring an excessive facility. CONSTITUTION:The relay contact point (r) of the relay of a relay driving circuit 14 is normally set to the on-state, and a commercial power source AC is connected to both receptacles 3A, 3B. When the total load current added with the load current of a load connected to the main receptacle 3A and the load current of a load connected to a demand object receptacle 3B is increased and the detection signal level of a current detecting circuit 12 exceeds a reference value, a current judging circuit 13 triggers a timer circuit 10. The timer circuit 10 starts counting when the trigger signal is fed, and it outputs the timer output. The relay driving circuit 14 drives a relay in response to the timer output to turn the relay contact point (r) off, and the power feed to the demand object receptacle 3B is cut off. A display circuit 15 lights a display lamp to display the demand action.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a demand outlet device.

[0002]

2. Description of the Related Art In a house, a high-capacity load such as an electric kotatsu and an electric heater may be supplied from a single outlet in winter. In this case, a current exceeding the rated current flows, which is dangerous, and the branch breaker may shut off to disable the minimum required load.

Therefore, there has been adopted a method in which a dedicated outlet (branch circuit) is provided corresponding to a high capacity load, or a high capacity branch breaker is provided in a distribution board to cope with the load.

[0004]

However, when considering a combination of a kotatsu and a heater or a combination of a heater and a dryer, the former is a case where a high capacity is required in the season, and the latter is a case where a high capacity is required only for a short time. Therefore, providing a dedicated outlet or providing a high-capacity branch breaker as described above becomes an excessive facility.

The present invention has been made in view of the above-mentioned problems, and its object is to ensure that the equipment is not overloaded, that a current higher than the rated value does not flow to the outlet, and that it is safe. It is an object of the present invention to provide a demand outlet device capable of avoiding power interruption due to turning off of a breaker.

[0006]

The present invention is provided with a main outlet and a demand target outlet, and
A current detecting means for detecting a load current of a load connected to the both outlets, and a control means for stopping the energization of the outlet for the demand object for a predetermined time after a certain time when the detected current value of the current detecting means exceeds a certain value. Be prepared.

Both outlets, the current detecting means, and the controlling means may be provided in the outlet body formed by the module size of the embedded wiring equipment.

[0008]

According to the present invention, when the sum of the load currents flowing through the main outlet and the demand outlets exceeds a certain level, the power supply to the demand outlets is automatically stopped for a predetermined time. Since it is possible to prevent a load current from flowing above a certain level, it is safe, and since it is possible to avoid power interruption by the branch breaker, connect a device with a timer function and a time display function to the main outlet side. In that case, it can protect against power failure. Moreover, there is no need to provide excess equipment.

If both outlets and the current detection means and the control means are provided in the outlet body formed by the module size of the embedded wiring equipment, it can be attached to the wall surface by the same construction as the embedded wiring equipment.

[0010]

The present invention will be described below with reference to the drawings. Figure 2
As shown in FIG. 1, the outlet main body 1 of the denmand outlet of the embodiment is a size module of general wiring equipment and is formed in a size of two stations. It is integrated, and the circuit shown in FIG. 1 is built in inside, and the receptacle for the main outlet 3A and the receptacle for the demand-target outlet 3B are provided on one side of the surface, and the receptacles for both outlets 3A, 3B The indicator lamp La for displaying the denmand operation is exposed between the two, and the knob 4 of the variable resistor 11 for adjusting the demand time is exposed on the other side of the surface.
In addition, the outlet body 1 is connected in parallel to the connection port of the power supply terminal 5 for connecting the power supply line 7 previously wired as shown in FIG. And the connection port of the feed terminal 6 of the. These terminals 5 and 6 are so-called quick-connect terminals.

The main outlet 3A is connected to the commercial power source AC connected to the power supply terminal 5 via the power supply line 7 via the current detection circuit 12 as shown in FIG. 1, and the demand target outlet 3B is connected to the relay. It is connected to the commercial power supply AC via the contact point r and the current detection circuit 12. Current detection circuit 12
Uses the current detection means such as CT to connect the outlets 3A, 3
It is for detecting the load current flowing in B, and outputs a detection signal having an electrical level according to the magnitude of the load current to the current determination circuit 13. When the current determination circuit 13 compares a preset reference value (for example, 15 A of rated current) L with the level of the detection signal and determines that the level of the detection signal exceeds the reference value L, it is several seconds to several seconds. A trigger signal is given to the timer circuit 10 after a timing time t after 10 seconds.

The timer circuit 10 is composed of, for example, a CR timer, and the time constant, that is, the demand time T can be adjusted within the range of several tens of seconds to several minutes by changing the time constant with the variable resistor 11. However, when the trigger signal is given, the time delay operation is started and the timer output is generated until the time limit of the demand time T ends.
The relay drive circuit 14 drives a relay (not shown) to turn off the relay contact r while the timer output is being given. Similarly, the display circuit 15 lights the display lamp La during the period when the timer output is given to display that the demand operation is in progress.

Here, the control means of the demand outlet device of the present invention comprises the current judging circuit 13 and the timer circuit 1.
0, a relay drive circuit 14, and a relay contact r. The power supply circuit 16 is for obtaining a DC power supply from the commercial power supply AC and supplying the power to the current determination circuit 13, the timer circuit 10, the relay drive circuit 14, and the display circuit 15.

Thus, in the normal state, the relay drive circuit 14
In order to turn on the relay contact r of the relay, the demand target outlet 3B is also connected to the commercial power supply AC, so that power can be supplied to the loads connected to both the outlets 3A and 3B. Main outlet now 3A
In addition to the load connected through the plug 8A to the demand target outlet 3B, if the load is used through the plug 8B, as shown in FIG. 4, the load current of the load connected to the main outlet 3A is changed to the demand target outlet 3B.
The load current of the load connected to B is added to increase the load current I. However, during the period a in which the level of the detection signal of the current detection circuit 12 is lower than the reference value L, the current determination circuit 13 shifts from the timer circuit 10 to the timer circuit 10. Does not output the trigger signal. When the load current on the side of the target outlet 3B increases and the level of the detection signal of the current detection circuit 12 exceeds the reference value L, the current determination circuit 13 passes the timing time t from the time when the current determination circuit 13 exceeds the reference value L, and the timer circuit 10 outputs the time. The trigger signal is output to. The timing time t is for preventing an operation due to a transient overcurrent, and is set to several seconds to several tens of seconds.

When the trigger signal is given, the timer circuit 10 starts the time limit and outputs the timer output. In response to the timer output, the relay drive circuit 14 drives the relay to turn off the relay contact r, and the demand. Target outlet 3B
Shut off the power supply to. At the same time, the display circuit 15 lights the display lamp La to display that the denmand operation is in progress.

When the denmant time T expires, the timer circuit 10 no longer outputs a timer output, so the display circuit 15 turns off the display lamp La, and the relay drive circuit 14 restores the relay and turns on the relay contact r. Let
The power supply to the demand target outlet 3B is restored.
Due to this restoration, the load current I increases again, and when the level of the detection signal of the current detection circuit 12 exceeds the reference value L, the current determination circuit 13 gives a trigger signal to the timer circuit 10 after the timing time t has passed again. ..

Therefore, the timer circuit 10 starts the time-delaying operation again to generate the timer output. With this timer output, the relay drive circuit 14 and the display circuit 15 operate in the same manner as described above. In the case of FIG. 4, since the load connected to the main outlet 3A is off during the demand time T again, the denmand time T ends after that and the output of the timer circuit 10 disappears and the relay contact Even if r is returned to the ON state and power is supplied to the demand target outlet 3B, the current value detected by the current detection circuit 12 is lower than the reference value L, so that the outlets 3A and 3B have the same values as in the normal state. It can be used and no denmand action occurs.

[0018]

According to the present invention, there is provided a main outlet and a demand target outlet, and current detecting means for detecting a load current of a load connected to both outlets.
When the detected current value of the current detecting means becomes a certain value or more, the control means for stopping the energization of the demand target outlet for a predetermined time after a certain time is provided, so that the load current flowing through the main outlet and the demand target outlet is When the sum exceeds a certain level, it is possible to automatically turn off the power supply to the outlet for demand for a predetermined time, so it is safe because no current over a certain level flows, and it is possible to avoid power cutoff by the branch breaker. Therefore, if a device having a timer function and a time display function is connected to the main outlet side, there is an effect that it can be protected from a power failure, and there is also an effect that it is not necessary to provide excessive equipment.

If both outlets and the current detection means and the control means are provided in the outlet body formed in the module size of the embedded wiring equipment, there is an effect that it can be attached to the wall surface by the same construction as the embedded wiring equipment.

[Brief description of drawings]

FIG. 1 is a circuit diagram of an embodiment of the present invention.

FIG. 2 is a perspective view of the above.

FIG. 3 is a rear view of the above.

FIG. 4 is a time chart for explaining the above operation.

[Explanation of symbols]

 3A Main outlet 3B Demand target outlet 10 Timer circuit 12 Current detection circuit 13 Current determination circuit 14 Relay drive circuit 15 Display circuit r Relay contact AC Commercial power supply

Claims (2)

[Claims] 1. A main outlet and a demand outlet, and current detecting means for detecting a load current of a load connected to both outlets, and a detected current value of the current detecting means being a certain value or more. A demand outlet device, comprising: a control means for stopping energization of the outlet for demand after a predetermined time for a predetermined time. 2. The demand outlet device according to claim 1, wherein both outlets, the current detection means, and the control means are provided in an outlet body formed in a module size of an embedded wiring device.