JPH037020A - Power supply controller - Google Patents

Abstract

PURPOSE:To reduce current before a current limiting circuit breaker is actuated by making a current limiting request to each end circuit when the current over the setting does flow. CONSTITUTION:If the current flowing to an incoming line exceeds the set value, then the primary request to limit the current will be made from an output section 8 of a current limiting control circuit 2 and a load in less importance will be interrupted corresponding to the primary demand by supply control circuits 14, 15 and 16. Unless the current flowing to the incoming line gets below the set value for all that, then the secondary request to limit the current will be made from the output section of a current limiting control circuit 2 and a load in less importance next to supply control circuits 14, 15 and 16 will be interrupted. Not withstanding unless the current flowing to the incoming line gets below the set value, all the power supply will then the interrupted by the actuation of a circuit breaker 3.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a power supply control device that controls power supply to a plurality of terminal circuits.

(Prior Art) Generally, commercial AC power is drawn into buildings such as homes and businesses via power transmission lines, pole transformers, integrated wattmeters, and the like. The service line inside the building is provided with a current limiting breaker that interrupts the circuit when the current exceeds the contracted current value, and a plurality of terminal circuits are provided branching off from the current limiting breaker.

These terminal circuits are installed in each room and floor of the building and are connected to lighting circuits and electrical outlets.

That is, when the current flowing through the drop-in line exceeds the contracted current value, the current limiting breaker is activated to cut off the power supply to each terminal circuit.

However, some of the loads connected to terminal circuits include electrical equipment such as computers that would be in trouble if the power was cut off.

Therefore, for example, Japanese Patent Publication No. 43-5623 and Japanese Patent Application No. 62
As shown in Japanese Patent Application No. 76618, there is a system in which power supply control is performed in accordance with the current flowing through the drop-in line only to a terminal circuit selected in advance by the user.

(Problem to be solved by the invention) However, in the above method, it is necessary to provide a selection control function for determining whether or not to perform power supply control for all terminal circuits, and as the number of terminal circuits increases, control becomes difficult. This becomes complicated and expensive. For this reason,
There is a problem that the number of terminal circuits is naturally limited.

Furthermore, since the electrical equipment connected to the terminal circuit is often changed, the user must redo the selection process each time, which is troublesome.

This invention has been made in view of the above-mentioned circumstances, and both of the power supply control devices according to claim 1 and claim 2 can be used without complicating control or increasing costs, and which can be easily controlled by the user. It is an object of the present invention to enable optimal power supply control for each terminal circuit without requiring troublesome work.

[Structure of the Invention] (Means for Solving the Problems) The power supply control device according to claim 1 comprises: a current limiting breaker that is provided in a power lead-in line and interrupts a circuit when the current exceeds a predetermined value; and this current limiting breaker. Multiple terminal circuits branched from and said? The present invention includes a current detecting means for detecting the current flowing through the rX current limiting breaker, and a sending means for sending a current limiting request signal to each of the terminal circuits when the detected current of the current detecting means exceeds a set value.

A power supply control device according to a second aspect of the present invention includes: a current limiting breaker provided in a power lead-in line and interrupting the circuit when the current exceeds a predetermined value; a plurality of terminal circuits branched from the current limiting breaker; current detecting means for detecting the current flowing through the limiting breaker; sending means for sending a current limit request signal to each of the terminal circuits when the detected current of the current detecting means exceeds a set value; and sending means for sending a current limit release signal to each of the terminal circuits when the detected current of the current detecting means becomes equal to or less than the set value.

(Function) In the power supply control device according to claim 1, when the current flowing through the power lead-in line increases and exceeds a set value, a current limit request signal is sent to each terminal circuit, and before the current limit breaker operates. Current limiting is performed appropriately in each terminal circuit.

In the power supply control device according to the second aspect, when the current flowing through the power lead-in line increases and exceeds a set value, a current limit request signal is sent to each terminal circuit, and the current limit request signal is sent to each terminal circuit before the current limit breaker operates. Current limitation is carried out appropriately. Then, when the current flowing through the drop-in line falls below the set value, a current limit release signal is sent to each terminal circuit, and the current limit in each terminal circuit is released.

(Example) Hereinafter, a first example of the present invention will be described with reference to FIG.

Commercial AC power is drawn into buildings such as homes and businesses via power transmission lines and pole transformers, and further via an integrating wattmeter 1.

A current-limiting breaker 3 and an earth leakage breaker 9 of a current-limiting control circuit 2 are sequentially arranged on the lead-in line in the building, and a plurality of terminal circuits 1° are branched from the earth-leakage breaker 9.

The current limit control circuit 2 includes a current limit breaker 3, a current detector 4 that detects the current flowing through the current limit breaker 3, a comparator 5 that compares the detected current of the current detector 4 with a set value, and a comparator 5 that compares the current detected by the current detector 4 with a set value. an operating current setting section 6 that provides set value data to the section 5; and a control section 7 that uses a microcomputer as a main body to execute current limiting control according to the comparison result of the comparison section 5.
, a flow restriction request signal (
- a next request signal and a secondary request signal) or a release signal to the drop-in line.

That is, the current limit control circuit 2 controls the current
A sending means sends a primary request signal for current restriction to each terminal circuit 10 when the fourth current exceeds a set value, and a sending means sends a primary request signal for current restriction to each terminal circuit 10 when the current flowing through the drop-in line exceeds the set value despite sending out the secondary request signal. A means for transmitting a request signal, and a transmitting means for transmitting a current limit release signal to each terminal circuit 10 when the 7tS current flowing through the lead-in line becomes less than a set value after transmitting the next or secondary request signal. There is.

The current limiting breaker 3 cuts off the power supply to each terminal circuit 10 when the current flowing through the drop-in line exceeds a predetermined value, for example, a contract current value.

A lighting circuit 12 and an outlet 13 are connected to each terminal circuit 10 via a circuit protection breaker 11, respectively.

The circuit protection breaker 11 interrupts the circuit when the current flowing through the terminal circuit 10 exceeds a predetermined value.

An electric device 20 is connected to the electric light circuit 12 via a supply control circuit 14 . The supply control circuit 14 is attached to the electrical equipment 20 , and upon receiving a current limit request signal sent through the terminal circuit 10 , cuts off the power supply to the electrical equipment 20 , and then cuts off the power supply to the electrical equipment 20 . When the current limit release signal is received, power supply to the electrical equipment 20 is restarted.

The electrical device 20 includes a power supply section 21 that converts the electric power given from the supply control circuit 14 into its own operating voltage, and a control section 22 for controlling the operation.

An electrical device 30 is connected to the outlet 13 via a supply control circuit 15 . The supply control circuit 15 is integrally installed in the electrical equipment 30, and upon receiving the current limit request signal sent through the terminal circuit 10, the electrical equipment 3
After that, when a current limit release signal sent through the terminal circuit 10 is received, the power supply to the electrical equipment 30 is restarted.

The electrical device 30 includes a power supply section 31 that converts power supplied from the supply control circuit 15 into its own operating voltage, and a control section 32 for controlling the operation.

An electrical device 40 is connected to the outlet 13. This electric device 40 includes a built-in supply control circuit 16, a power supply section 41 that converts the electric power given from the supply control circuit 16 into its own operating voltage, and a control section 42 for controlling operation.

When the supply control circuit 16 receives a current limit request signal sent through the terminal circuit 10 , it cuts off the power supply to the power supply section 41 , and when it receives a current limit release signal sent through the terminal circuit 10 thereafter. This is to open the power supply to the power supply unit 41 by +1j.

That is, the supply control circuits 14, 15, and 16 include energization control units such as open/close switches for actually controlling the power supply;
A signal detection section that receives the current limit request signal and release signal, a condition setting section that sets the usage conditions of the corresponding electrical equipment, and a comparison between the settings of this condition setting section and the detection signal of the signal detection section. It has a comparison/determination section that determines how to control the power supply, and an output section that sends the determination result of the comparison/judgment section to the energization control section.

Three conditions, A, B, and C, have been established for the use of electrical equipment. A is something like a computer that will suffer if the power is cut off. B is for devices such as video cameras, microwave ovens, rice cookers, and lighting equipment that do not allow the power supply to be cut off with the primary request signal, but only allow the power supply to be cut off with the secondary request signal. Type C allows the power supply to be cut off immediately in response to a primary request signal, like an air conditioner.

By the way, the setting value of the operating current setting section 6 of the current limit control circuit 2 may be, for example, a value slightly lower than the operating current value of the current limit breaker 3 [allowable current (081 to 0.5 A)].
].

Further, as the primary and secondary request signals for current restriction sent from the output section 8 of the current restriction control circuit 2, for example, an instantaneous power outage signal can be considered.

This instantaneous power outage signal is a signal of several Hz to several tens of Hz,
This activates the instantaneous power outage response control inherent in electrical equipment. In the case of AV equipment, this instantaneous power outage response control ensures the operation of the equipment and timer operation based on the voltage of the charging circuit, and in the case of air conditioners, it indicates a power outage and prevents restarting for a certain period of time. be.

Note that a specific pulse code signal may be used as the current limit request signal, and this can also be used as a current control release signal.

Next, the operation in the above configuration will be explained.

Electrical equipment 20, 30, 40 is connected to a nearby electric light circuit 12 or outlet 13. At the time of this connection, a supply control circuit 14, 1516 attached to each electrical device is interposed between the connection with the terminal circuit 10.

When each electrical device is operating, if the current flowing through the drop-in line exceeds a set value, a primary request signal for current restriction is sent from the output section 8 of the current restriction control circuit 2. This next request signal passes through each terminal circuit 10 and supply control circuits 14, 15 .
Sent to 16th.

At this time, the power supply is immediately cut off in the supply control circuit whose usage condition of the corresponding electrical equipment is C among the supply control circuits 14, 15, and 16. In other words, the power supply is immediately cut off. stops.

If the current flowing through the lead-in wire does not fall below the set value even after this, the output section 8 of the current limit control circuit 2 outputs the electric current tEffi!
Secondary request No. 1g of J limit is sent.

At this time, among the remaining supply control circuits, in the supply control circuit whose usage condition of the corresponding electrical equipment is B,
Power supply is cut off. In other words, the operation of the corresponding electrical equipment is stopped.

However, in the supply control circuit where the usage condition of the corresponding electrical equipment is A, the power supply will not be cut off.
Electrical equipment continues to operate.

Normally, through the operations up to this point, the current flowing through the drop-in line is reduced to a set value or less, and it is possible to avoid a complete cutoff of power supply due to the operation of the current limiting breaker 3. .

Note that it is also possible to notify the user at the same time as sending out the next request signal and request the user to stop the operation of the electrical equipment.

When the current flowing through the drop-in line falls below a set value, a current limit release signal is sent from the output section 8 of the current limit control circuit 2. This release signal passes through each terminal circuit 10 and is sent to the supply control circuits 14, 15, and 16.

At this time, among the supply control circuits 14, 15, and 16, the supply control circuit whose power supply is cut off is released. In other words, the operation of the corresponding electrical equipment is restarted.

In this way, when the current flowing through the service line increases, the current is reduced before the current limiting breaker 3 operates, thereby avoiding the current limiting breaker 3 from completely cutting off the power supply. It is safe and does not affect the operating load.

Moreover, since the current limit control circuit 2 simply sends out current control request signals and release signals regardless of the status of each terminal circuit 10, even if the number of terminal circuits 10 is large, the control becomes complicated. This will not cause an increase in costs. In other words, a large number of terminal circuits 10 can be secured.

Furthermore, even if the electrical equipment connected to the terminal circuit 10 is changed, the user does not have to do anything, which is convenient.

Furthermore, since power supply is automatically restarted when the current flowing through the drop-in line falls below a set value, the user does not have to worry about this point either (and is convenient).

A WS2 embodiment of this invention will be explained with reference to FIG.

In the drawings, the same parts as in FIG. 1 are designated by the same reference numerals, and detailed explanations will be omitted.

Here, a current limit control circuit 50 is provided on the downstream side of the current limit breaker 3 in the service line.

As shown in FIG. 3, the current limit control circuit 50 includes a current detection section 51 that detects the current flowing through the service line, a comparison section 52 that compares the detected current of the current detection section 51 with a set value, and this comparison section 52. Operating current setting unit 5 that provides set value data to
3. A control unit 54 that executes current limit control based on the comparison result of the comparison unit 52 mainly using a microcomputer; It consists of an output section 55 that sends out a request signal) or a release signal to the drop-in line.

That is, the current limit control circuit 50 includes sending means that sends a primary request signal for current restriction to each terminal circuit 10 when the current flowing in the drop-in wire exceeds a set value, and a sending means that sends a primary request signal for current restriction to each terminal circuit 10 when the current flowing in the drop-in wire exceeds a set value. Means for sending out a secondary request signal when the flowing current is above a set value, and means for canceling the current restriction in each terminal circuit 10 when the current flowing in the drop-in line becomes below the set value after sending out this - next or secondary request signal. and sending means for sending out a signal.

The operation and effects are the same as in the first embodiment.

A third embodiment of the invention will be described with reference to FIG.

In the drawings, the same parts as in FIGS. 1 to 3 are designated by the same reference numerals, and detailed explanations will be omitted.

Here, the service line is branched into a plurality of lines within a predetermined area, and each line is led to the building via an integrating wattmeter 1. A current limit control circuit 50 is provided on the upstream side of the branch in the lead-in line.

In this case, the total current value for a plurality of drop lines in the same area is compared with a set value, and a current limit request signal and a release signal are sent to each terminal circuit 10 through each drop line.

In other words, one current limit control circuit 50 can control the power supply to a plurality of service lines within the same area.

Other operations and effects are the same as those in the first and second embodiments.

[Effects of the Invention] As described above, according to the present invention, the power supply control device of claim 1 comprises: a current limiting breaker that is provided in a power lead-in line and interrupts the circuit when the current exceeds a predetermined value; A plurality of terminal circuits branched from the limiting breaker, a current detecting means for detecting the current flowing through the current limiting breaker, and when the detected current of the current detecting means exceeds a set value, a current limiting request signal is sent to each of the terminal circuits. Since the terminal is equipped with a sending means for sending out the power, it is possible to perform optimal power supply control for each terminal circuit without complicating control, increasing costs, or requiring troublesome work by the user. .

A power supply control device according to a second aspect of the present invention includes: a current limiting breaker that is provided on a power lead-in line and interrupts the circuit when the current exceeds a predetermined value; a plurality of terminal circuits branched from the current limiting breaker; and the current limiting breaker. current detecting means for detecting the current flowing in the 74 current detecting means; sending means for sending a current limit request signal to each of the terminal circuits when the detected current of the 74 current detecting means exceeds a set value; Since the present invention is equipped with a sending means that sends a current limit release signal to each terminal circuit when the detected current of the detecting means becomes less than the set value, it is possible to avoid complicating control and increasing costs, and also to allow the user to control the current limit. Optimal power supply $-II 1311 for each terminal circuit can be performed without requiring troublesome work.

11 of the control circuit of the second embodiment of the present invention.
-1 configuration, FIG. 3 is a diagram showing a specific configuration of a current limit control circuit in the same embodiment, and FIG. 4 is a diagram showing a configuration of a control circuit in a third embodiment of the present invention.

2... Current limit control circuit, 3... Current limit breaker, 10... Terminal circuit, 14, 15.16... lJl
, supply control circuit, 20, 30. 40... electrical equipment.

Claims (2)

[Claims] (1) A current-limiting breaker installed in the power lead-in line that cuts off the circuit when the current exceeds a predetermined value, a plurality of terminal circuits branched from this current-limiting breaker, and a current that detects the current flowing through the current-limiting breaker. A power supply control device comprising: a detection means; and a sending means for sending a current limit request signal to each of the terminal circuits when the current detected by the current detection means exceeds a set value. (2) A current-limiting breaker installed in the power lead-in line that cuts off the circuit when the current exceeds a predetermined value, a plurality of terminal circuits branched from this current-limiting breaker, and a current that detects the current flowing through the current-limiting breaker. a detection means; a sending means for sending a current limit request signal to each of the terminal circuits when the current detected by the current detection means exceeds a set value; and after sending the request signal, the current detected by the current detection means reaches the set value; 1. A power supply control device comprising: sending means for sending a current limit release signal to each of the terminal circuits when the current limit falls below a current limit value.