JP3899827B2 - Output branch device and shut-off unit - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an output branch unit and the interruption unit used therefor and outputs the load branches to a plurality of power input from the power supply.
[0002]
[Prior art]
In general, the output capacity and price of a power supply device are not in a linear relationship, and tend to be cheaper as the capacity increases. For this reason, for example, as shown in FIG. In many cases, a system is configured by connecting a plurality of loads 13 such as sensors and motors in parallel to one high-capacity power supply device 1 that converts and outputs.
[0003]
[Problems to be solved by the invention]
In this way, when a plurality of loads 13 are connected to one power supply device 1 and one of the plurality of loads 13 is short-circuited, the power supply device 1 uses the overcurrent protection function to supply power. The output is cut off and the entire system stops.
[0004]
For this reason, for example, when a control computer is connected as a load, the internal data saving process is not in time, requiring a large amount of man-hours for recovery or a load necessary for ensuring safety. For example, there is a difficulty in that the power to the area sensor, the evacuation guide light, and the like for detecting the presence of the worker and stopping the operation of the machine tool is cut off.
[0005]
Therefore, it is possible to install a breaker on the power supply line from the power supply to each load and cut off only the power supply line of the load that is short-circuited. However, install a breaker on the power supply line of each load. However, the work is troublesome, and there is a problem that space is required accordingly.
[0006]
The present invention has been made in view of the above-described points. The power supply input is branched into a plurality of outputs, and when an overcurrent flows through the branched output, only the line can be cut off. For the purpose.
[0007]
[Means for Solving the Problems]
The present invention is configured as follows in order to achieve the above-described object.
[0008]
That is, the output branching device of the present invention is an output branching device that branches a power input into a plurality of outputs and outputs it to a load, and is detachably mounted with a shut-off unit that shuts off the output line corresponding to the branched output line The interruption unit includes a current detection circuit for detecting a current flowing through the output line, a current interruption circuit for cutting off a current flowing through the output line, and the current interruption circuit based on an output of the current detection circuit. A control circuit for controlling the current interruption operation by the control circuit, and the control circuit of the interruption unit controls the current interruption circuit to output from the output line when the voltage of the power input rises to a predetermined voltage. Is to give.
[0009]
According to the present invention, when the power supply input from the power supply device is branched into a plurality of outputs and outputted to a plurality of loads, a shut-off unit that shuts off the output line corresponding to the output line can be detachably attached. It is possible to cut off only the output line that flows. In addition, since the power input voltage from the power supply device rises to a predetermined voltage and the power supply device does not sufficiently start up, the power supply output is not given from the output line to the load. However, it is possible to avoid a situation in which the load starts to operate and a large current flows to cause a start-up failure of the power supply device.
[0010]
One of the branched output lines outputs the power input as it is without going through the shut-off unit , while the remaining output lines can be attached and detached individually corresponding to each output line. It is good also as a structure which can be attached to .
[0011]
In this case, one of the branched output lines outputs the power input as it is without going through the shut-off unit , so when an overcurrent flows through this output line, the overcurrent protection function of the power supply device The remaining output lines will also be cut off. If one of these output lines is connected to a load with a high priority, for example, a load necessary for ensuring safety, the power supply is supplied to the load necessary for ensuring safety. When the power cannot be supplied, the supply of power to the load of the remaining output line is stopped, for example, the machine tool or the like can be stopped, and the safety is improved.
[0012]
It is good also as a structure which can mount | wear with the said interruption | blocking unit individually corresponding to each of several branched output lines.
[0013]
In this case, when the power input from the power supply device is branched and output, a plurality of shut-off units that individually cut off the over-current corresponding to each output line can be attached, so that the over-current flowed. Only the output line can be cut off.
[0014]
The blocking unit may include a timing adjustment circuit that adjusts an output timing from an output line with respect to a power input.
[0015]
In this case, the output timing for outputting the power input from the power supply device to the load can be adjusted, so that it is possible to cope with cases where it is desired to start up the load in order, especially the load required for ensuring safety first. It becomes possible to start up, and safety is improved.
[0016]
In another embodiment of the present invention, when an output is given from the output line , an operation indicator for displaying the output is provided.
[0017]
At least one of the plurality of output lines branching, may be connected to the battery.
[0018]
In this case, since a battery is connected to at least one of the plurality of branched output lines, power can be supplied from the battery to the load even during a power failure, and the load is stopped for ensuring safety. Safety is improved by connecting a load that is not allowed, for example, an evacuation guide light.
[0019]
In a preferred embodiment of the present invention, the interruption unit includes an operation unit for controlling an interruption operation of the current interruption circuit.
[0020]
According to the present invention, the operation of the operation unit can be used to control the output line cutoff operation by the current cutoff circuit, so that only the required output line of the plurality of branched output lines can be shut off by the operation of the operation unit. , Can be conducted.
[0021]
The shut-off unit of the present invention is a shut-off unit that is detachably mounted on an output branch device that branches a power input into a plurality of outputs and outputs the load, and shuts off the output line corresponding to the branched output line, A current detection circuit for detecting a current flowing through the output line; a current cutoff circuit for cutting off a current flowing through the output line; and a control for controlling a current cutoff operation by the current cutoff circuit based on an output of the current detection circuit The control circuit controls the current cutoff circuit to give an output from the output line when the voltage of the power input rises to a predetermined voltage.
[0022]
In another embodiment of the present invention, when an overcurrent flows through the output line, the output line is cut off.
[0023]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
[0024]
(Embodiment 1)
FIG. 1 is a schematic configuration diagram of a system including an output branching apparatus according to an embodiment of the present invention.
[0025]
In the figure, reference numeral 1 denotes a general-purpose power supply device that converts commercial AC AC to DC DC and outputs it, and converts AC from an AC input terminal (not shown) into a stabilized DC voltage of, for example, 24 V to generate DC. It outputs from the output terminals 2a and 2b, and incorporates a power supply circuit such as an insulating switching regulator.
[0026]
Reference numeral 3 denotes an output branching device according to the present invention which branches a DC input from the power supply device 1 into a plurality of branches and outputs them to various loads 13 such as sensors, solenoids, motors or indicator lights. In FIG. 1, only two loads 13 connected to the output branch device 3 are representatively shown.
[0027]
The output branching device 3 is detachably mounted with a plurality of, in this embodiment, four shutoff units 41 to 44, for shutting off an overcurrent when the overcurrent flows through a plurality of branched output lines. . Each of the cutoff units 4 ₁ to 4 ₄ is configured according to an overcurrent value to be cut off. In FIG. 1, the cutoff units 4 ₁ to 4 having an overcurrent value of 2A, 1A, 1A, and 0.5A. ₄ is shown.
[0028]
Each of the shut-off units 4 ₁ to 4 ₄ is provided with operation display LEDs 5 _{1 to} 5 ₄ that turn on and display a DC output to the load via the corresponding output line. Each blocking unit ₄₁ to ₄ is provided with a connector terminal portion (not shown), by receiving mounting in the housing portion of the output branch unit 3 body, it is electrically connected to the connector terminal portion of the inner body It is configured as follows. Further, each of the shut-off units 4 ₁ to 4 ₄ is provided with first and second switches SW 1 and 2 (not shown) and a variable resistor VR, which are not shown.
[0029]
The output branching device 3 branches the DC input terminals 6a and 6b to which the DC voltage from the power supply device 1 is applied, and the DC input from the DC input terminals 6a and 6b into a plurality of units, and blocks the shut-off units 4 ₁ to 4 ₄ . via a plurality of DC output terminals 7 ₁ a to give a DC output for each load, 7 ₁ b~7 ₄ a~7 ₄ b has a respective output terminal _{7 1 a, 7 1 b~7 4} a to _7-4 b is corresponds individually to each breaking unit 4 _{1-4 4.} The output branch device 3 is lit when an overcurrent flows through one of the branched output lines and the corresponding shut-off units 4 ₁ to 4 ₄ perform a shut-off operation to shut off the output line. A warning LED 8 is provided.
[0030]
In this embodiment, one output line among the plurality of output lines branched from the DC input is a priority output that outputs the DC input as it is without going through the shut-off unit, and corresponds to this priority output. DC output terminals 9a and 9b are provided, and loads having high priority are assigned to the DC output terminals 9a and 9b.
[0031]
Furthermore, a battery for supplying DC power to a load connected to a specific output line can be connected to the back side of the output branch device 3 even if there is no DC input from the power supply device 1 due to a power failure. A connecting terminal portion is provided. Further, the output branching device 3 can be attached to a support rail (not shown), and can be juxtaposed with the power supply device 1 on the support rail.
[0032]
FIG. 2 is a diagram showing the inside of the output branching device 3 of FIG. 1 in a simplified manner, and portions corresponding to those in FIG.
[0033]
In this embodiment, the DC input applied from the power supply device 1 to the DC input terminals 6a and 6b is branched into a plurality of parts, and the respective shut-off units 4 ₁ to 4 ₄ are connected to the plus side of the branched output lines, respectively. When an overcurrent flows through the output line, the corresponding shut-off units 4 ₁ to 4 ₄ perform a shut-off operation as described later to shut off only the corresponding output line. When an overcurrent flows through the output line of the priority output, the DC input is cut off and the supply of power to all loads is cut off by the overcurrent protection operation of the power supply device 1 as in the prior art. Become.
[0034]
As described above, the load connected to the priority output detects a load having a high priority, for example, the presence of the worker 14 necessary for ensuring safety as shown in FIG. 3, and stops the operation of the machine tool 15. Area sensor, specifically, for example, a light-sensitive sensor group 19 comprising a light projecting element group 16 and a light-receiving element group 17 for detecting the passage of the worker or a pressure sensor 19 for detecting the pressure due to the worker 14 entering. In the state where the area sensor cannot operate, the power supply to other loads can be cut off at the same time to stop the operation of the machine tool and the like, thereby improving safety.
[0035]
FIG. 4 is a block diagram of the output branching device 3 in FIG. 1, and parts corresponding to those in FIG.
[0036]
In this embodiment, among the _four shut-off units 4 ₁ to 4 ₄ , the shut-off unit 4 ₁ corresponding to the overcurrent value 2A has a DC power supply to the load even if the DC input from the power supply device 1 is lost due to a power failure. The battery input terminal 11 is provided as the above-described connection terminal portion for connecting the battery 10 that supplies the battery. Further, the blocking unit 4 _1, below the connector terminals CN1~CN5 is shown connected to the interior of the connector terminal of the output branch unit 3.
[0037]
Each of the shut-off units 4 ₁ to 4 ₄ is connected to the connector terminal CN6 of the alarm circuit 12 including the warning LED 8 described above, and when any of the shut-off units 4 ₁ to 4 ₄ performs the shut-off operation, the following As described above, the warning LED 8 is lit in red and gives a warning output.
[0038]
FIG. 5 is a block diagram of the shut-off unit 41 in FIG. 4 and shows a representative example of the plurality of shut-off units 4 ₁ to 4 ₄ .
[0039]
Breaking unit 4 ₁ includes a current detection circuit 20 for detecting a current flowing through the corresponding output lines of the output line which is branched into a plurality, as described above, a current cut-off circuit 21 to cut off the current flowing through the output line Based on the output of the current detection circuit 20, the control circuit 22 that controls the current interruption operation by the current interruption circuit 21 and the above-mentioned operation display LED 51 when a DC output is applied to the load via the output line. Is displayed in green, and a battery guarantee circuit 24 that performs a protection operation of the battery 10 by switching charging / discharging paths is provided. Except for the battery guarantee circuit 24, the other shut-off units 4 ₂ to 4 ₄ and their configurations are basically the same.
[0040]
Breaking unit 4 _1, when overcurrent flows to the output line extending from the connector terminal CN1 to CN4, detected by the current detection circuit 20, control circuit 22 is intended to cut off the output line to control the current cut-off circuit 21 .
[0041]
FIG. 6 is a circuit diagram showing a detailed configuration of the shut-off unit 41 in FIG. 5, and parts corresponding to those in FIGS. 4 and 5 are given the same reference numerals.
[0042]
The current detection circuit 20 includes resistors R1 to R3, a transistor TR1, a capacitor C1, and a thyristor THY, and includes first and second switches SW1 and SW2 as operation units. The current cut-off circuit 21 includes a polyswitch TH1 and a relay X1 that rapidly increase in impedance when a current greater than a certain value flows.
[0043]
The control circuit 22 includes a Zener diode ZD, resistors R4 to R7, a diode D2, a capacitor C2, and a transistor TR2, and a variable resistor VR.
The display circuit 23 includes the above-described operation display LED 51 and the resistor R8, and the battery guarantee circuit 24 includes the resistor R9, the diode D3, and the polyswitch TH2.
[0044]
In this interrupting unit 41, when the DC input is not applied from the power supply device 1 to the connector terminal CN1, the relay contact of the relay X1 is on the B contact side connected to the connector terminal CN3, and the load is connected. The output line to the connector terminal CN4 which is the side to be connected is cut off.
[0045]
When a DC input is supplied from the power supply device 1 to the connector terminal CN1, and the DC input voltage rises to a predetermined voltage corresponding to the Zener diode ZD of the control circuit 22, for example, 24V, the Zener diode ZD is turned on and controlled. A voltage is applied to the base of the transistor TR2 of the circuit 22 to conduct it, the relay coil of the relay X1 is excited, the relay contact is switched to the A contact side, and a DC output is applied from the connector terminal CN4 to the load. At the same time, the operation display LED 51 of the display circuit 23 is turned on and lit.
[0046]
Next, when the load is short-circuited and an overcurrent exceeding a certain value flows, the transistor TR1 of the current detection circuit 20 is turned on, the gate current flows through the thyristor THY, and the transistor TR2 of the control circuit 22 is turned off. When the relay contact of the relay X1 returns to the B contact side, the output line is interrupted.
[0047]
At this time, a DC input is applied to the connector terminal CN3 on the B contact side, and the connector terminal CN6 of the alarm circuit 12 shown in FIG. 7 is connected to the connector terminal CN3. In the circuit 12, the above-described warning LED 8 is turned on, and the relay contact of the relay X2 is switched to give a warning output to an external device such as a programmable controller connected between the connector terminals CN8 and CN10. it can.
[0048]
Next, the first and second switches SW1 and SW2 as operation units in the current detection circuit 20 of FIG. 6 will be described.
[0049]
The first switch SW1 is operated when the DC output to the load is cut off. By turning on the first switch SW1, the thyristor THY of the current detection circuit 20 is turned on, and the transistor of the control circuit 22 is turned on. When TR2 is turned off and the relay contact of the relay X1 returns to the B contact side, the output line is forcibly cut off. Therefore, in a state where a DC output is applied to each load via each of the cutoff units 4 ₁ to 4 ₄ , only the DC output of the required cutoff unit can be forcibly turned off by manual operation.
[0050]
On the other hand, the second switch SW2 is operated when the load is short-circuited to perform the above-described shut-off operation and replaced after the short-circuited fault is replaced. That is, when the second switch SW2 is operated in a state where the current flows through the second switch SW2 and the thyristor THY and the transistor TR2 of the control circuit is turned off by the shut-off operation, the current path is switched and the transistor TR2 is turned on. Thus, the relay coil of the relay X1 is excited and the relay contact is switched to the A contact side, and a DC output can be given to the replaced load via the connector terminal CN4. Therefore, it can be restored by manual operation.
[0051]
Above description of the operation of, although performed on blocking unit 4 _1, operation of the other cut-off unit 4 _{2-4 4} is also similar, when overcurrent flows to one of the branch output lines, corresponding blocking unit Only 4 ₁ to 4 ₄ perform the shut-off operation and only the output line is shut off, and the entire system does not stop.
[0052]
In addition, unlike the conventional example, it is not necessary to install a breaker for each line, a troublesome connection work is not required, and a space for installing the breaker is not necessary.
[0053]
In this embodiment, as described above, the DC input voltage applied to the connector terminal CN1 rises to a predetermined voltage corresponding to the Zener diode ZD of the control circuit 22, for example, 24V, and the Zener diode ZD becomes conductive. As a result, the relay contact is switched to provide a DC output from the connector terminal CN4 to the load. That is, after the power supply device 1 has sufficiently started up and the DC output voltage has increased, supply to the load is started. Therefore, it is possible to avoid a situation in which a DC output is applied to the load when the power supply device 1 is not sufficiently up and the load starts to operate, a large current flows, and a start-up failure of the power supply device 1 occurs.
[0054]
Further, in this embodiment, the timing at which the transistor TR2 is turned on to provide a DC output to the load can be adjusted by the time constant circuit as the timing adjustment circuit including the variable resistor VR and the capacitor C2 of the control circuit 22. , i.e., in this example, by adjusting the resistance value of the variable resistor VR, it is possible to adjust the timing of the DC output to the load with respect to the DC input from the power supply unit 1, the cutoff unit ₄₁ to The order of starting up each load to which DC output is applied from ₄ can be adjusted. Therefore, for example, it is possible to start up a load necessary for ensuring safety first, and then start up a load with high priority, thereby improving safety.
[0055]
Further, by connecting the battery 10 described above, the battery 10 is charged via the resistor R9 of the battery guarantee circuit 24. When the power input from the power supply device 1 is cut off during a power failure, the battery 10 is charged via the diode D3. A direct current output can be given to the load, and the load can be driven even during a power failure.
[0056]
Furthermore, in this embodiment, the current interrupting circuit 21 includes the polyswitch TH1 whose impedance suddenly increases when a current of a certain value or more flows. Therefore, when the relay X1 is welded and the overcurrent cannot be interrupted. The overcurrent can be cut off by the polyswitch TH1. Similarly, since the battery guarantee circuit 24 includes the poly switch TH2, when the load has a short circuit failure, the poly switch TH2 can cut off the overcurrent.
[0057]
FIG. 8 is an example of a time chart for explaining the operation. FIG. 8A is an AC input to the power supply device 1, and FIG. 8B is a power output from the power supply device 1, that is, a DC of the output branch device 3. input, FIG. (c) is the DC output of the blocking unit 4 _first output branch unit 3, and FIG. (d) shows also DC output of the blocking unit 4 _2, FIG. (e) is a priority output of the output branch 3 Each is shown. FIG. 8 shows the operation in a state where the battery is not connected, and only the shut-off units 4 ₁ and 4 ₂ are shown.
[0058]
In T1, in response to the power output from the power supply device 1, the shut-off unit 4 ₁ and the priority output respectively provide a direct current output to the load, while the shut-off unit 4 ₂ is set by the time constant setting of the time constant circuit described above. The DC output is applied to the load at a timing delayed by the period t.
[0059]
In T2, blocking unit 4 _1, performs a breaking operation by detecting an overcurrent, interrupting unit 4 ₂ and the priority outputs, giving a DC output to independently load. By the power input after the abnormality of the load of the shut-off unit 4 ₁ is recovered and the power output from the power supply device 1 is cut off, the shut-off unit 4 ₁ returns at T3.
[0060]
In T4, blocking unit 4 ₂ performs a breaking operation by detecting an overcurrent, interrupting units 4 ₁ and preferentially output is giving a DC output to independently load. Breaking unit 4 to recover the abnormality of the _second load, in T5, for returning the second switch SW2 of the current detection circuit 20 is manually operated.
[0061]
In blocking unit 4 _1, at T6, the first switch SW1 of the current detection circuit 20 to interrupt the output in manual operation, in T7, and the second switch SW2 of the current detection circuit 20 to return to manual operation.
[0062]
If an overcurrent flows through the priority output at T8, the power supply output is stopped and all outputs are stopped by the overcurrent protection operation of the power supply device 1.
[0064]
In the above-described embodiment, the first and second switches are provided as the operation unit, but only one of them may be provided as another embodiment of the present invention.
[0065]
In the above-described embodiment, the priority output is provided, but the priority output may be omitted.
[0066]
In the above embodiment, the positive side of the power supply line is cut off. However, as another embodiment of the present invention, the negative side may be cut off, or the positive side and the negative side may be cut off. It is good also as a structure.
[0067]
【The invention's effect】
As described above, according to the present invention, when the power input from the power supply device is branched into a plurality of outputs and output to a plurality of loads, a shut-off unit that shuts off the output line can be attached corresponding to the output line . Only the output line through which the overcurrent flows can be cut off. In addition, unlike the conventional example, it is not necessary to install a breaker for each line, a troublesome connection work is not required, and a space for installing the breaker is not necessary.
[Brief description of the drawings]
FIG. 1 is a schematic configuration diagram of a system including an output branching apparatus according to an embodiment of the present invention.
FIG. 2 is a diagram schematically showing the inside of the output branching device 3 of FIG. 1;
FIG. 3 is a diagram illustrating an area sensor that detects the presence of an operator.
FIG. 4 is a block diagram of the output branching device 3 of FIG.
5 is a block diagram of a shut-off unit 4 ₁ of FIG.
6 is a circuit diagram showing a detailed configuration of blocking unit 4 ₁ of FIG.
FIG. 7 is a configuration diagram of an alarm circuit.
FIG. 8 is a time chart for explaining the operation.
FIG. 9 is a configuration diagram of a conventional example.
[Explanation of symbols]
1 Power supply device 3 Output branch device 4 ₁ to ₄ 4 Shut-off unit (shut-off means)
DESCRIPTION OF SYMBOLS 10 Battery 13 Load 20 Current detection circuit 21 Current interruption circuit 22 Control circuit

Claims (5)

An output branching device that branches a power input into a plurality of outputs and outputs the load
A shut-off unit that shuts off the output line corresponding to the branched output line can be detachably mounted.
The interruption unit includes a current detection circuit for detecting a current flowing through the output line, a current interruption circuit for interrupting a current flowing through the output line, and an interruption of current by the current interruption circuit based on an output of the current detection circuit. A control circuit for controlling the operation,
The output branching device according to claim 1, wherein the control circuit of the interrupting unit controls the current interrupting circuit to give an output from an output line when a voltage of a power input rises to a predetermined voltage. The output branching device according to claim 1, further comprising an operation indicator for displaying an output from the output line. The output branch device according to claim 1, wherein the interrupting unit includes an operation unit for controlling an interrupting operation of the current interrupting circuit. A disconnecting unit that is detachably attached to an output branching device that branches a power supply input into a plurality of outputs and outputs the load, and that shuts off the output line corresponding to the branched output line,
A current detection circuit for detecting a current flowing through the output line; a current cutoff circuit for cutting off a current flowing through the output line; and a control for controlling a current cutoff operation by the current cutoff circuit based on an output of the current detection circuit Circuit and
The said control circuit controls the said current interruption circuit, and when the voltage of a power supply input rises to a predetermined voltage, it provides an output from an output line, The interruption | blocking unit characterized by the above-mentioned. The interruption | blocking unit of Claim 4 which interrupts | blocks this output line when an overcurrent flows into the output line.

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