JP2020173102A - Loading device operation detection circuit, loading device operation detection device, and loading device operation display device - Google Patents

Abstract

To provide a loading device operation detection circuit, an operation detection device including the circuit, and an operation display device including the circuit capable of detecting whether or not a loading device is in operation without using an intrinsic sensor in order to detect whether or not the loading device is in operation.SOLUTION: An operation detection circuit determines whether or not a loading device 20 is in operation by detecting a determination reference current to be set in accordance with the maximum use current of a rated current capacity of a circuit protection apparatus 30.SELECTED DRAWING: Figure 2

Description

The present invention relates to an operation detection circuit and the operation detection circuit device. In particular, in each distribution circuit of the operation detection circuit and the distribution board, a device using an operation detection circuit that displays whether or not the load device under it is in operation and an operation display device with a load destination name display space using the device. Regarding.

In the distribution boards 9 mainly used for communication equipment and installed on a rack, and the distribution boards 91 and 92 which are intermediate current supply devices installed above the distribution boards 9, circuit protection devices, that is, fuses 31, breakers 33 or The circuit protector (not shown) or the like is changed according to the type of communication equipment (for example, server, router, etc.) which is a load device under the circuit protector, that is, the rated current of the communication equipment. Therefore, circuit protection devices such as fuses can be inserted and removed from the insertion / removal section 90 (FIGS. 4 to 10). Therefore, when the load device is renewed and a new load device is connected, it may be changed to a circuit protection device such as a fuse having a different capacity. At this time, if the adjacent fuse or the like is accidentally pulled out, an accident may occur in which the operating device is stopped. In order to prevent such an accident, the current of the output cable on the back of the distribution board is measured, and after confirming that no current is flowing, the fuse 31 and the like on the front of the distribution board are removed, but they are adjacent to each other. It could not be said that the mistake of removing the circuit protection device such as a fuse did not occur. Therefore, there is a request to surely confirm whether the load device is in operation.

Therefore, in the past, a sensor may be mounted to measure the current, but it was not possible to display the current individually on the distribution board. For example, in the case of measurement with a sensor such as a Hall element, the rated current of the maximum fuse must be measured, so the minute current region is cut off with an accuracy of about ± 3%, and the current below this is applied. There was a lack of reliability in determining whether or not the load device was in operation, such as when it was in use.

Therefore, as shown in FIG. 12, a minute current is detected by a sensor, and an indicator light during operation of the load device is installed near the fuse. However, this method had to match the rated current of the maximum fuse regardless of which sensor was used, and had to be a very sensitive mechanism for judging the operation of a small-capacity load device. Therefore, it is difficult to protect the mechanism for turning on the indicator lamp, such as when a large current flows at the time of a short circuit or when an adjacent circuit is broken, the voltage fluctuation becomes excessive and the sensor fails. Further, as shown in FIG. 13, when a shunt resistor is used, a voltage drop may occur and power may be lost. When a Hall element is used, it is not suitable for measurement in a minute current region due to the problem of residual magnetic flux. In addition, the current transformer cannot normally measure direct current. A method for detecting energization using a sensor and a device thereof are described in Patent Document 1.

Further, due to the structure, the distribution board 9 installed in the rack for communication equipment has a limitation in the height direction so as not to overwhelm the size and quantity of the communication equipment which is the load device mounted on the rack. , It is necessary to provide the device at a height and width that can accommodate the existing circuit protection device. Further, there is a request that when a fuse or the like is blown or tripped due to a short circuit or an overcurrent, it can be replaced as a unit of an operation display device of a load device and a circuit protection device.

Japanese Unexamined Patent Publication No. 2002-311064 Japanese Unexamined Patent Publication No. 2008-99522

In the case of detection by the above-mentioned conventional sensor, when making a judgment during operation in a distribution board connected from a load device with a small current to a large one, the one with a large current is so small and accurate. Although it is not necessary to make a judgment based on a proper reference current, it is inevitable to match the load device with a small current. In addition, since a very low current value is used as a criterion for that purpose, not only is it susceptible to noise, but it is also susceptible to surge failure. Furthermore, since the sensor must be incorporated in the main circuit of the distribution board, there are restrictions on the type of sensor and the connection location. Further, it is desirable that the operation detection device can be easily replaced in the event of a failure. In addition, the operation display device itself must not cause an erroneous interruption due to a failure.

Therefore, the present invention provides an operation detection circuit for a load device, which can detect whether or not the load device is in operation without using a unique sensor to detect whether or not the load device is in operation. It is an object of the present invention to provide an operation detection device provided and an operation display device provided with the circuit.

Therefore, according to the present invention, it is possible to provide an operation detection circuit of a load device characterized by detecting an internal resistance corresponding to a rated current capacity of a circuit protection device as a shunt resistance.

In addition, in the operation detection circuit of the load device, it is determined whether or not the load device is in operation by detecting the judgment reference current set according to the maximum working current of the rated current capacity of the circuit protection device. It is characterized by.

Further, the circuit protection device connected in the operation detection circuit of the load device is at least one of a fuse, a breaker, and a circuit protector.

According to another embodiment of the present invention, the maximum rated current capacity of the circuit protection device is the maximum of the circuit protection device and the internal resistance connected to the circuit protection device and corresponding to the rated current capacity of the circuit protection device as a shunt resistance. By detecting the determination reference current set according to the current used, it is possible to provide an operation detection device for a load device including an operation detection circuit for determining whether or not the load device is in operation. ..

Further, the circuit protection device connected to the operation detection device of the load device is at least one of a fuse, a breaker, and a circuit protector.

Further, it is characterized in that a failure confirmation circuit is connected to the operation detection circuit of the operation detection device of the load device.

According to another embodiment of the present invention, the internal resistance corresponding to the rated current capacity of the circuit protection device housed in the housing is set as the shunt resistance according to the maximum working current of the rated current capacity of the circuit protection device. The load device is provided with an operation detection circuit that determines whether or not the load device is in operation by detecting a determination reference current, and an operation indicator lamp connected to the operation detection circuit. Operation display device can be provided.

Further, the circuit protection device connected in the operation display device of the load device is at least one of a fuse, a breaker, and a circuit protector.

Further, in the operation display device of the load device, the housing is provided with a failure confirmation switch connected to the failure confirmation circuit connected to the operation detection circuit.

Further, the operation display device of the load device is characterized in that the housing is provided with a load destination name display space.

According to another embodiment of the present invention, the internal resistance corresponding to the rated current capacity of the circuit protection device housed in the housing is set as the shunt resistance according to the maximum working current of the rated current capacity of the circuit protection device. Judgment reference The operation of the load device, which is characterized by having an operation detection circuit that determines whether or not the load device is in operation by detecting the current, and an operation indicator light that is connected to the operation detection circuit. An operation display device unit of a load device including a display device and a circuit protection device connected to the operation display device is provided.

According to the present invention, circuit protection devices such as fuses, breakers, and circuit protectors can function as alternative sensors for shunt resistors, making it possible to accurately and easily determine the operation of a load device with a small capacity to a large capacity. it can.

FIG. 1 is a schematic external view of an operation display device and a circuit protection device of the load device of the present invention. FIG. 2 is a schematic configuration diagram of an operation detection device for the load device of the present invention. FIG. 3A is a circuit diagram including an operation display device of the load device, and FIG. 3B is a circuit diagram showing a portion corresponding to the operation detection circuit and the display device of the load device. It is a circuit diagram of an example of a failure confirmation circuit. It is an external perspective view of a rack mount type distribution board. It is an external perspective view of the UP fuse. FIG. 5 is an external perspective view showing a state in which the UP fuse shown in FIG. 6 is inserted into and removed from the rack mount type distribution board shown in FIG. It is an external view of the intermediate current supply device installed above the rack mount type distribution board. It is an external view of the intermediate current supply device installed above the rack mount type distribution board. It is an external perspective view which shows an example of UP fuse. It is an external perspective view which shows an example of a breaker. It is a block diagram of the operation detection device of the conventional load device. It is a block diagram of the operation detection device of the conventional load device. It is an overall block diagram of a distribution board and a load device.

The embodiment of the operation detection circuit of the load device, the operation detection device of the load device, and the operation display device of the load device of the present invention will be described with reference to FIGS. 1 to 5 and 14.

The operation detection circuit of the load device, the operation detection device of the load device, and the operation display device of the load device of the present invention distribute a relatively large amount of direct current such as a distribution board mainly for communication equipment shown in FIG. It is used in each distribution board of the distribution board 9 and the distribution board 91 which is an intermediate current supply device, and the operation detection circuit detects the current, and the communication device (for example, a server or) as the load device 20 under the distribution board 9 Determines whether the router, etc.) is in operation and displays it visually.

Examples of combinations of the distribution board and the circuit protection device include a fuse 31 as the circuit protection device 30 for the distribution board 9, the distribution board 91 (for example, DC48V), and a circuit protection device 30 for the distribution board 92 (for example, DC380V). As a breaker 33 is assumed. The following embodiment is shown mainly assuming a distribution board that distributes direct current. However, the operation detection circuit of the load device, the operation detection device of the load device, and the operation display device of the load device according to this embodiment are shown. It can also be used for AC distribution boards.

(Example 1)
As shown in the circuit example of FIG. 3, the operation detection circuit C is a current detection circuit 60 that can be connected to the circuit protection device 30 and the load device 20 under it, and is a circuit protection device to which the current detection circuit 60 is connected. The internal resistance corresponding to the rated current of 30 is treated as a shunt resistance to detect the current.

(Example 2)
As shown in FIG. 2, the operation detection device of the load device includes a circuit protection device 30 (for example, a fuse 31, a breaker 33, a circuit protector (not shown), etc.) and an operation detection circuit connected to the circuit protection device 30. It is a configured circuit. As illustrated in Table 1, the circuit protection device 30 has an internal resistance corresponding to the rated current. Therefore, the load device 20 treats the internal resistance as a shunt resistance and the current detection circuit 60 detects the current. Determine if it is in operation. Here, whether or not the load device 20 by the current detection circuit 60 is in operation is determined by detecting a determination reference current set according to the maximum working current of the rated current capacity of the circuit protection device 30, that is, the circuit protection device 30. It is judged by detecting whether or not the judgment reference current has flowed by detecting the voltage difference between the terminals of.

For example, as shown in Table 2, when a fuse 31 having a rated current capacity of 50 A is used, the maximum working current of the load device 20 is 35 A. Here, the reference current determined to be in operation is set to 0.1 A. The standby current of the load device 20 differs depending on the device, but even if the standby current is about 1% of the maximum working current, if an appropriate fuse is selected, the current detection circuit 60 will detect the voltage difference between the terminals of the circuit protection device 30. By detecting, it is detected whether or not the reference current has flowed, and it is determined whether or not the load device 20 is in operation.

FIG. 3 is a circuit example of the operation detection device of the load device. Explaining a circuit example, the control power supply 10 is a control power supply for the current detection circuit 60 and the operation indicator lamp 4 described later, and power-controls these. A current detection circuit 60 is provided between the circuit protection device 30 of the intermediate current supply device installed above the distribution board 9 and the load device 20 under the circuit protection device 30 to detect the current. As the current detection method, an operational amplifier, a comparator, a current sense amplifier, an AD converter and the like are assumed. Both analog output and digital output are assumed as the current output method. The indicator light 40 is connected to the current detection circuit 60. The failure confirmation circuit 70 operates the current detection circuit 60 in a pseudo manner by using a switch or a signal from the outside. If the circuit operates, a lighting display output is performed, and the operation indicator lamp 4 is lit or blinked.

FIG. 4 is a circuit example of the failure confirmation circuit 70. If the voltage between the terminals of the circuit protection device 30 is input to the current detection circuit 60 and the circuit connected in parallel operates, the indicator lamp lights up and it can be confirmed whether the operation detection device is out of order.

(Example 3)
The operation display device 1 of the load device shown in FIG. 1 is a display device in which a substrate including the operation detection circuit C of the load device is housed inside the housing 2. The operation detection circuit C of the load device of the operation display device 1 of the load device can be integrally connected to the circuit protection device 30 connected to the housing 2. An operation indicator light 4 and a failure confirmation switch 5 connected to the operation detection circuit C are arranged outside the housing 2. Further, a load destination name display space 3 is provided on the surface of the housing 2.

The operation display device 1 of the load device and the circuit protection device 30 connected to the operation display device 1 of the load device constitute the operation display device unit 7, and the operation display device unit 7 is integrally formed on the distribution board 9. It is designed to be inserted and removed from the insertion / removal portion 90. In FIG. 1, a circuit protection device 30 is connected below the operation display device 1 of the load device so that it can be inserted into and removed from the insertion / removal portion 90 of the distribution board 9.

The distribution board 9 for communication equipment has a height restriction in the height direction so as not to overwhelm the size and quantity of communication equipment, which is a load device mounted on the rack, and has a height that can accommodate existing circuit protection equipment. It is necessary to provide the device in the width, but with such a configuration, the circuit protection device 30 that has been used in the past can be used as it is, and the operation display device 1 of the load device provided with the load destination name display space. Will be connected above the circuit protection device 30.

According to the configuration of the operation detection circuit of the load device and the operation detection device of the load device described above, even if the load device 20 uses a small current, the circuit protection device 30 of the fuse 31 having a small rated current, that is, a high resistance value is also used. Even if the current is smaller, it is possible to determine that the load device 20 is in operation.

By using a circuit protection device 30 such as a fuse 31, a breaker 33, or a circuit protector as an alternative sensor for a shunt resistor, it is possible to accurately and easily determine the operation of a load device having a small capacity to a large capacity. Further, since the circuit protection device 30 itself is used as an alternative sensor, it is not necessary to newly provide a sensor, and a compact and inexpensive device can be provided.

Regardless of whether the circuit protection device is a plug-in type or a fixed type, in the method using sensors such as shunt resistors, it is necessary to prepare multiple types of appropriate sensors according to the circuit protection device, but according to this device, in the first place There is no need to prepare a sensor.

By turning on the operation indicator lamp 4 using the failure confirmation circuit, it is not necessary to shut off the load device in operation even if the operation detection device of the load device fails. Further, since the operation detection device of the load device does not install a circuit such as a sensor that passes through the main circuit of the distribution board, the load device can be replaced without stopping the operation.

Further, according to the above-mentioned operation display device of the load device, the device can be provided with a height and width that can accommodate the existing circuit protection device, the load destination name can be displayed at the same position as before, and the size of the communication device. And does not put pressure on the quantity.

1 Load device operation display device 2 Housing 3 Load destination name display space 4 Operation indicator light 5 Failure confirmation switch 7 Load device operation display device unit 9 Distribution board 90 Insertion / removal part 91 Distribution board 92 Distribution board 93 Load Destination name display label 10 Control power supply 20 Load device 30 Circuit protection device 31 Fuse 33 Breaker 40 Indicator light 50 Switch / external signal 60 Current detection circuit 70 Failure confirmation circuit

Claims (11)

An operation detection circuit for a load device, which is characterized in that an internal resistance corresponding to the rated current capacity of a circuit protection device is used as a shunt resistance to detect current. The first aspect of claim 1, wherein it is determined whether or not the load device is in operation by detecting a determination reference current set according to the maximum operating current of the rated current capacity of the circuit protection device. Operation detection circuit for load equipment. The operation detection circuit for a load device according to claim 1 or 2, wherein the circuit protection device is at least one of a fuse, a breaker, and a circuit protector. Judgment criteria set according to the maximum working current of the circuit protection device and the rated current capacity of the circuit protection device, with the internal resistance connected to the circuit protection device and corresponding to the rated current capacity of the circuit protection device as the shunt resistance. An operation detection device for a load device, which comprises an operation detection circuit that determines whether or not the load device is in operation by detecting an electric current. The operation detection device for a load device according to claim 4, wherein the circuit protection device is at least one of a fuse, a breaker, and a circuit protector. The operation detection device for a load device according to claim 4 or 5, wherein a failure confirmation circuit is connected to the operation detection circuit. The load device is a load device by detecting the judgment reference current set according to the maximum operating current of the rated current capacity of the circuit protection device, using the internal resistance corresponding to the rated current capacity of the circuit protection device housed in the housing as the shunt resistance. An operation display device for a load device, which comprises an operation detection circuit for determining whether or not is in operation, and an operation indicator light connected to the operation detection circuit. The operation display device for a load device according to claim 7, wherein the circuit protection device is at least one of a fuse, a breaker, and a circuit protector. The operation display device for a load device according to claim 7 or 8, wherein the housing includes a failure confirmation switch connected to a failure confirmation circuit connected to the operation detection circuit. The operation display device for a load device according to any one of claims 7 to 9, wherein the housing is provided with a load destination name display space. The load device is a load device by detecting the judgment reference current set according to the maximum operating current of the rated current capacity of the circuit protection device, using the internal resistance corresponding to the rated current capacity of the circuit protection device housed in the housing as the shunt resistance. An operation display device of a load device including an operation detection circuit for determining whether or not is in operation, and an operation indicator light connected to the operation detection circuit, and an operation display device connected to the operation display device. An operation display unit for a load device, which is characterized by being composed of a circuit protection device.