JP2016217744A - In-rack current monitor device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an in-rack current monitor device that cuts down an installation space required for measurements by narrowing down functions to current monitoring, and can make measurements with high accuracy.SOLUTION: An in-rack current monitor device includes: a plurality of sensor IF units 12 to which a current sensor 2 measuring source power of information instruments is connected; a current measurement unit 13 that calculates a current value of each information instrument from a current signal of the connected current sensor 2; and a communication IF 16 for externally transmitting calculated current value data via a communication network N. The sensor IF unit 12 is provided with a plurality of A/D conversion circuits, and is configured to convert an analog current signal to be output by the current sensor 2 to digital data, and output the digital data. The current measurement unit 13 is configured to calculate the source power of each information instrument from the digital data.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an in-rack current monitoring device that monitors currents flowing through individual devices in a rack containing information devices such as servers.

  2. Description of the Related Art Conventionally, there is a monitoring device that can measure a current in a rack in which an information device such as a server is stored and remotely monitor it via a communication network. For example, the monitoring device of Non-Patent Document 1 connects a current transformer as a current sensor to the power line of each device, converts an analog current signal output from the current transformer into a digital signal by an AI unit, and then monitors the monitoring device. The current value was calculated by the (network monitoring device) and output to the outside (see Non-Patent Document 1).

Kawamura Electric Industrial Co., Ltd. Catalog “Remote Environment Monitoring System”, [Search May 1, 2015], Internet <URL: http://www.kawamura.co.jp/datacom/nw_haiden/.../rp48_pamph. pdf>

The conventional monitoring device described above can reduce the installation space of equipment by specializing the monitoring target for current and the like. However, since the current sensor used for measuring the current uses a current transformer, the output is analog, and in order to connect to the monitoring device, a device for performing A / D conversion separately (in the above non-patent document 1, AI is used). Unit). For this reason, there are many devices installed in the rack even if specializing in current measurement, and a large installation space is required, and the number of devices required for measurement increases in proportion to the number of devices to be measured.
Furthermore, when multiple AI units are used, the AI units are connected in series with a single cable, and data is transmitted to the monitoring device by serial communication, so the communication speed is slow and accurate data cannot be obtained. There was a case.

  Therefore, in view of such problems, the present invention provides an in-rack current monitoring device capable of measuring equipment with high accuracy while reducing the installation space of equipment necessary for measurement by narrowing down the function to current monitoring. It is aimed.

In order to solve the above problems, the invention of claim 1 is an in-rack current monitoring device that measures the power supply current of each information device housed in a rack and transmits the measured current data to the outside. A plurality of sensor terminals to which a current sensor for measuring a power supply current of information equipment is connected, a sensor interface unit provided for each sensor terminal, which converts an analog signal input to the sensor terminal into a digital signal, and a digital signal It has a current measurement unit that calculates a current value based on a communication interface for transmitting the calculated current value data to the outside via a communication network.
According to this configuration, since the sensor interface unit performs A / D conversion, an analog current signal output from the current sensor can be directly input. Therefore, the conventional current sensor can be used without separately providing A / D conversion means, and can be installed in a space-saving manner.

According to a second aspect of the present invention, in the configuration of the first aspect, the sensor interface unit outputs at least three digitally converted current data every predetermined time, and the current measurement unit outputs a current output by the sensor interface unit. An average value of the remaining current data obtained by deleting the maximum value and the minimum value every predetermined time is obtained from the data, and is output as measurement data.
According to this configuration, since the average value obtained by deleting the maximum value and the minimum value every predetermined time is used as measurement data, noise and waveform distortion can be removed and highly accurate current value information can be transmitted.

  According to the present invention, since the sensor interface unit performs A / D conversion, an analog current signal output from the current sensor can be directly input. Therefore, the conventional current sensor can be used without separately providing A / D conversion means, and can be installed in a space-saving manner. In addition, since the average value obtained by deleting the maximum value and the minimum value every predetermined time is used as measurement data, noise and waveform distortion can be removed and highly accurate current value information can be transmitted.

1 shows an example of an in-rack current monitoring device according to the present invention, and is a configuration diagram of an entire monitoring system including a monitoring device connected via a communication network.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments embodying the present invention will be described below in detail with reference to the drawings. FIG. 1 shows an example of an in-rack current monitoring device according to the present invention, and shows the overall configuration of a monitoring system including a monitoring device connected via a communication network. Reference numeral 1 is an in-rack current monitoring device, 2 is a current sensor composed of a current transformer, for example, 3 is a monitor device which is an external device, and 4 is a router for communicating with the monitor device 3 via a communication network N.
The in-rack current monitoring device 1 and the monitoring device 3 are connected via a LAN 10 and a communication network N.

  The in-rack current monitoring device 1 includes a plurality of sensor terminals 12a connected to a plurality of current sensors 2, and a sensor interface unit including an A / D conversion circuit that converts analog data into digital data for each sensor terminal 12a. (Sensor IF unit) 12 is provided. In addition, a current measurement unit 13 that calculates a current value based on digital data output from the sensor IF unit 12, a storage unit 14 that stores HTML and Web data for data display in addition to storing measurement results, A current monitoring device CPU 15 for controlling the transmission control and in-rack current monitoring device 1, a communication interface (communication IF) 16 for communicating with the monitoring device 3 via the communication network N, and the like are provided. Note that the current measurement unit 13 is configured by an arithmetic circuit formed as an IC.

  The monitor device 3 includes a monitor 31 for displaying various information, a WEB browser 32 for displaying a WEB page of the in-rack current monitoring device 1, a communication interface (communication IF) 33 connected to the communication network N, and the like. For example, a personal computer is applied.

  The in-rack monitoring apparatus 1 configured as described above operates as follows. When the sensor IF unit 12 receives an analog current signal from the connected current sensor 2, it converts it into digital data every 0.1 seconds, for example, and outputs it. As a result, 10 pieces of data are output to the current measuring unit 13 per second.

  The current measuring unit 13 calculates and outputs a current value, for example, every second based on the data output from the sensor IF unit 12. Specifically, with respect to 10 data input per second, the maximum value and the minimum value are deleted, and the remaining 8 data are averaged and output as measurement values. In this way, measurement data is output every second.

The current value data output from the current measuring unit 13 is stored in the storage unit 14 under the control of the current monitoring device CPU15. At this time, the current monitoring device CPU 15 saves the graphed data on the previously created WEB page in addition to saving the measurement data itself.
When the in-rack current monitoring device 1 operating in this way receives access from the monitor device 3, the data stored in the storage unit 14 is transmitted and displayed on the monitor 31 of the monitor device 3. For example, a WEB page created by the in-rack current monitoring device 1 is displayed.
Furthermore, if the current value data is stored in the storage unit 14 for a certain period, for example, an average current value every hour or every day, and a maximum value / minimum value for a certain period can be calculated. Can be used for analysis.

Thus, since the sensor-in IF unit 12 performs A / D conversion, an analog current signal output from the current sensor 2 can be directly input. Therefore, the conventional current sensor 2 can be used without separately providing A / D conversion means, and can be installed in a space-saving manner.
In addition, since the average value obtained by deleting the maximum value and the minimum value every predetermined time is used as the measurement value, the current value information with high accuracy can be transmitted while removing noise and waveform distortion.

  In the above embodiment, the sensor IF unit 12 outputs measurement data every 0.1 seconds, but the data output interval is arbitrary, and every 0.2 seconds, even every 0.2 seconds. May be. Further, the average value calculated by the current measurement unit 13 may not be every second.

  1 .... In-rack current monitoring device, 2 .... current sensor, 3 .... monitor device, 12 .... sensor interface unit, 12a ... sensor terminal, 13 .... current measuring unit, 14 .... storage unit, ... Current monitoring device CPU, 16 .... communication interface, N ... communication network.

Claims (2)

An in-rack current monitoring device that measures the power supply current of each information device housed in a rack and transmits the measured current data to the outside.
A plurality of sensor terminals to which a current sensor for measuring a power supply current of the information device is connected;
A sensor interface unit that is provided for each sensor terminal and converts an analog signal input to the sensor terminal into a digital signal;
A current measurement unit that calculates a current value based on the digital signal;
A rack current monitoring apparatus, comprising: a communication interface for transmitting the calculated current value data to the outside via a communication network. The sensor interface unit outputs at least three digitally converted current data every predetermined time,
The current measurement unit obtains an average value of remaining current data obtained by deleting the maximum value and the minimum value every predetermined time from the current data output by the sensor interface unit, and outputs the average value as measurement data. The in-rack current monitoring apparatus according to claim 1.

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