JPH0833187A - Power distributor - Google Patents

Abstract

PURPOSE:To recover a conduction state when the recovery cancellation current value of a load is reached when a total load current value is broken by breaking the conduction to the load in a preset order when the total load current value exceeds a limitation current value. CONSTITUTION:A current I from a power supply 1 to a total load is detected by a total load current detection part 2 and a switcher 3n is broken via a switcher drive part 6n in a set order by a breaking order setting part 9 to stop power supply to a load 5n when the detected current exceeds a set value Im by a limitation current value setting part 8 stored at a memory part 12. The current value of the load 5n is detected by a current detection part 4n, each maximum value of each load is recorded at a memory part 12, and a value Inmin obtained by subtracting the maximum value from a limitation value Im is stored as the recovery cancellation current value of each load. Then, Icmin of the load is compared with the total current I in an order according to the recovery order setting part 10 and the conduction to the load recovers in the case of I<=Inmin.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power distributor for distributing power to a plurality of loads. When the total load current exceeds the limit, the loads are sequentially cut off in a predetermined order, and when the total load current decreases, the power is supplied. The present invention relates to a device that sequentially returns to the energized state from a maximum current load that does not exceed the limit of the total load current even when the state returns.

[0002]

2. Description of the Related Art A home or office, which receives power from a commercial power source, is provided with a circuit breaker at the entrance of indoor wiring, and a current exceeding a current value set by this circuit breaker is applied to a load. When it flows, the circuit breaker operates and shuts off the power supply. In recent years, in homes or offices, for example, electronic devices having a data processing function such as small computer devices and word processor devices have been installed. Among these devices, When the power is turned off during data processing, there are some cases in which unprocessed data is destroyed or input data disappears. Further, in some image recording devices and the like, when the timer recording is set, the timer recording is not executed unless the setting is made again by powering off.

[0003]

As described above, in recent homes, offices, and the like, equipment having a possibility of causing a failure due to interruption of power supply has been installed. In view of the conventional problems described above, an object of the present invention is to provide a switch for each load in a power distribution path that distributes power to a plurality of loads, and to provide a current detection unit for each load to determine the maximum current value of each load. The detected value is detected and stored in the microcomputer. Then, a total load current detector is provided to detect the total load current, and when the detected value exceeds a preset limit current value, the switches are turned off one by one in a predetermined order, and To prevent the occurrence of a failure by delaying the order of shutting off the power source of the device that causes a failure due to the interruption, and the value detected by the total load current detection unit is
An object of the present invention is to restore the switch of the load to the energized state when the value becomes equal to or less than the value obtained by subtracting the maximum current value of the load from which the energization is interrupted from the limited current value.

[0004]

In order to solve the above-mentioned problems, the present invention provides a power distributor for distributing power to a plurality of loads, and a plurality of switches for respectively interrupting / energizing the power supply to each load. , A switch drive unit for driving each switch, a microcomputer for controlling the switch drive unit and storing the maximum current value of each load, and a total load current for detecting a total load current to the plurality of loads Consisting of a detection unit and a load-specific current detection unit for detecting the current of each load, when the detection value by the total load current detection unit exceeds a predetermined limit current value, a control signal is output from the microcomputer in advance, Disconnecting the switch of the corresponding load via the switch drive unit in the set order,
When the value detected by the total load current detection unit becomes less than or equal to the value obtained by subtracting the maximum current value of the load from the predetermined current limit value, the switch of the load is returned to the energized state so that the power distributor is turned on. Configured.

[0005]

With the above configuration, in the power distributor according to the present invention, when the total load current value exceeds the predetermined limit current value, the switches are driven in a predetermined order to supply power to the load. Shut off one by one. Then, when the value detected by the total load current detection unit becomes equal to or less than a value obtained by subtracting the maximum current value of the load that has been de-energized from the predetermined limit current value, the switch of the load is returned to the energized state.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a power supply distributor according to the present invention will be described in detail below with reference to the drawings. FIG. 1 is a block diagram of essential parts showing an embodiment of a power distributor according to the present invention. In the figure, 1 is a power supply, for example, a commercial power supply supplied from an electric power company. Reference numeral 2 denotes a total load current detection unit that detects the total load current value supplied from the power supply to the plurality of loads. 3a, 3b,
3c is a switch, which is provided for each of the load 5a, the load 5b, and the load 5c. Reference numerals 4a, 4b, and 4c are current detection units, which detect current values to the loads 5a, 5b, and 5c, respectively. 6a, 6b,
6c is a switch driving unit, which is composed of, for example, a relay or the like, and switches 3a,
The switches 3b and 3c are individually driven to be cut off / energized. A limiting current value setting unit 8 sets an upper limit value of the total load current. Reference numeral 9 is a breaking sequence setting unit, which sets the breaking sequence of the switches when the detected value by the total load current detecting unit 2 exceeds the limit value by the limiting current value setting unit 8. Reference numeral 10 denotes a return order setting unit that sets the priority order of the switches to be returned to the energized state when the value detected by the total load current detection unit 2 falls below a predetermined current value.

Reference numeral 11 of the microcomputer 7 is an input unit, which includes the limiting current value setting unit 8, the shutoff sequence setting unit 9, and the return sequence setting unit.
Enter the data from 10. 12 is a memory unit, and 11 is an input unit.
Data set by the limiting current value setting unit 8, the cutoff sequence setting unit 9, and the return sequence setting unit 10, and the current detection unit 4a and the current input via the A / D conversion unit 13 described later. The data from the detection unit 4b and the current detection unit 4c is stored. The A / D converter 13 converts the current value detected by the total load current detector 2, the current detector 4a, the current detector 4b, or the current detector 4c into digital data. Reference numeral 14 denotes a control unit, which performs a required calculation with the data from the A / D conversion unit 13 and the data read from the memory unit 12, and outputs a control signal. 15 is an output section, which is a control section
The control signal from the switch driver 6a, switch driver 6b,
Or output to the switch drive unit 6c, switch 3a, switch 3b,
Alternatively, the switch 3c is cut off / energized.

Next, the operation of the power distributor according to the present invention will be described with reference to the flowchart shown in FIG. Between the power supply 1 and the loads 5a, 5b, and 5c (including the case where a plurality of devices are connected to one load), a switch 3a for each load,
The switch 3b or the switch 3c is provided, the total load current detection unit 2 is interposed between the power source 1 and each of these switches, and each switch is connected between each load. A current detection unit 4a, a current detection unit 4b, or a current detection unit 4c that detects a current for each load is inserted. When the total amount of current to the load becomes excessive, the limiting current setting value which is the reference for shutting off the switch 3a, the switch 3b or the switch 3c is set by the limiting current value setting unit 8 and The disconnection order of whether to disconnect from the switch is set by the disconnection order setting unit 9, and when the total load current amount decreases, the priority recovery order of which switch will return to the energized state is the recovery order setting unit 10. Set by.

The data set by the limiting current value setting unit 8, the cutoff sequence setting unit 9, and the return sequence setting unit 10 are input from the input unit 11 of the microcomputer 7, and the memory unit 12 via the control unit 14. Is recorded in (STEP 1, hereafter, ST
Abbreviated as 1). Then, the current of the load 5a is detected by the current detector 4a.
Ia is detected and converted into digital data by the A / D converter 13. The current detection unit 4a detects the load current at regular time intervals, for example, but the first data is set as the maximum current value Ia max of the load 5a and the load 5a of the memory unit 12 is passed through the control unit 14. The current value Ia recorded in the data storage area and digitally converted by the A / D conversion unit 13 after the second detection is set as the maximum current value Ia max of the load 5a read from the memory unit 12 by the control unit 14. In comparison, if Ia> Ia max (ST2: Yes), the current value Ia detected this time is set as a new maximum current value, and the load 5a data Ia max of the memory unit 12 is rewritten to this (ST3). Then, by the current detection unit 4b and the current detection unit 4c, the current Ib of the load 5b, the load 5c
The current Ic of each of the memory cells 12 is detected and compared with the maximum current value recorded in the memory section 12, respectively, and when the detected value at this time is larger (ST4: Yes, ST6: Yes), the load of the memory section 12 The 5b data Ib max or the load 5c data Ic max is rewritten with new data (ST5, ST7).

When the total load current amount decreases, the release current value Ia min for returning the switch to the energized state (total load current value for which the switch 3a may be returned to the energized state), Ib min (the same,
The switch 3b) and Icmin (same as the switch 3c) are calculated as follows (ST8). That is, by the control unit 14,
First, for the switch 3a, the maximum current value Ia max of the load 5a read from the memory unit 12 is subtracted from the limited current value Im read from the memory unit 12, and this value is released from the load 5a.
It is set to Iamin and recorded in the data storage area of the load 5a of the memory unit 12, and thereafter, the same processing is performed on the switches 3b and 3c. Then, the control unit 14 compares the total load current value I detected by the total load current detection unit 2 and digitally converted by the A / D conversion unit 13 with the limited current value Im read from the memory unit 12, When ≧ Im, the control unit 14 outputs a signal according to the shutoff order read from the memory unit 12, and the output unit 15 outputs the signal.
Switch driver 6a, 6b, or 6c of the corresponding load via
Control signal to the corresponding switch 3a, 3b, or 3c
Shut off (ST10).

Thereafter, the total load current decreases, and the control unit 14 causes the current value I of the total load current detection unit 2 to change to the limited current value.
When it is determined that it is smaller than Im (ST9: No), if the first order when returning to the energized state read from the memory unit 12 is, for example, the load 5a (ST11: Yes), the current value I Is compared with Ia min, and if I ≦ Ia min (ST12: Ye
s), a control signal is output from the control unit 14 to the switch drive unit 6a via the output unit 15, the switch 3a is switched to the energized state, and the load 5a
Supply power to (ST13). The first order of restoration of energization read from the memory unit 12 is the load 5b (ST11: No, ST
14: Yes), if I ≤ Ib min (ST15: Yes), switch 3b is switched to energization and power is supplied to load 5b (ST1
6) Or, the first order of return is load 5c (ST11: No, S
T14: No), if I ≦ Ic min (ST17: Yes), switch 3c is switched to energization and power is supplied to load 5c (ST1
8).

The limiting current value setting section 8 can set an arbitrary current value as long as it is equal to or lower than the breaking current setting value set in the breaker provided at the entrance of the indoor wiring. In addition, the shut-off order set by the shut-off order setting unit 9 is set in consideration of the contents of the failure caused by the power shut-down. Further, in the above, an example in which the power source is distributed to the loads of three systems has been described, but the same can be applied to the case of two distributions, or four or more distributions.

[0013]

As described above, according to the power supply distributor of the present invention, when the total load current value exceeds the predetermined limit current value, the power supply to the load is cut off in a preset order, When the total load current value becomes equal to or less than the value obtained by subtracting the maximum current value of the load whose current supply is cut off from the limited current value, the current supply to the load is restored. Therefore, a device that is not troubled by the power being cut off during use will not be cut off by an increase in power consumption of other loads unless power supply from the power supply source is stopped. Even when a large number of devices are used under a load current close to the breaking capacity, a small computer device or word processor device can be used with peace of mind.

[Brief description of drawings]

FIG. 1 is a block diagram of essential parts showing an embodiment of a power supply distributor according to the present invention.

FIG. 2 is a flow chart for explaining the operation of the power distributor according to the present invention.

[Explanation of symbols]

 1 power supply 2 total load current detection unit 3a switch 4a current detection unit 5a load 6a switch drive unit 7 microcomputer 8 limiting current value setting unit 9 shutoff sequence setting unit 10 reset sequence setting unit 12 memory unit 13 A / D conversion unit 14 Control unit

Claims (5)

[Claims] 1. A power distributor for distributing power to a plurality of loads, a plurality of switches for respectively interrupting / energizing the power supply to each load, a switch driving unit for driving each switch, and the same switch. Control unit drive unit, and also stores the maximum current value of each load, a total load current detection unit that detects the total load current to the plurality of loads, and a load-specific current detection that detects the current of each load When the value detected by the total load current detection unit exceeds a predetermined current limit value, a control signal is output from the microcomputer, and the control signal is applied via the switch drive unit in a preset order. When the switch of the load is shut off and the value detected by the total load current detection unit becomes less than or equal to the value obtained by subtracting the maximum current value of the load from the specified current limit value, the switch of the same load is returned to the energized state. Power supply characterized in that Distributor. 2. The microcomputer determines the maximum current value of each load based on the detected value from the load-specific current detection unit, and stores the determined maximum current value for each load. During shutoff, the maximum current value of the load whose current has been shut off is read from the stored data, this value is subtracted from the predetermined limit current value, and the value detected by the total load current detection unit becomes less than or equal to this subtracted value. 2. The power distributor according to claim 1, wherein the switch of the load is returned to the energized state in the event of a failure. 3. The current detector for each load detects the current value of each load at a required time interval, and the microcomputer detects the detected value for each load by the current detector for each load as the previous value of the same load. The current value determined to be large by this comparison is stored for each load, and the maximum current value of the load whose current is cut off is read when the switch is turned off. 2. The power distributor according to claim 1, wherein the switch of the load is restored to the energized state when the value detected by the total load current detection unit is less than or equal to the subtracted value. 4. The power supply distributor according to claim 1, further comprising a limiting current value setting unit so that the limiting current value can be set arbitrarily. 5. A disconnection sequence setting unit is provided so that the energization interruption sequence of each of the switches can be arbitrarily set, and a return sequence setting unit is provided so that the energization return sequence of the plurality of switches can be arbitrarily set. The power supply distributor according to claim 1, characterized in that