JP5527800B2 - Electronic device and fan control method - Google Patents

Description

  The present invention relates to an electronic device and a fan control method, and more particularly to an electronic device and a fan control method in which an extension device can be mounted.

  The heat generation components in a server such as a CPU (Central Processing Unit) and a memory have been increasing in power consumption year by year. Along with the increase in power consumption, the amount of heat generated by heat-generating components has also increased, and the operating rate of fans for cooling this heat generation has increased. For this reason, the number of rotations of the fan increases, and noise generated by the rotation of the fan increases.

  In addition, among PCs (Personal Computers), a server has excellent expandability, and accordingly, a large number of heat generating components are mounted. Therefore, the server cooling function is fan control that enables sufficient cooling even when the server expandability is maximized. However, cooling is excessive for a server that is not so expanded. Such excessive cooling has also caused noise due to the rotation of the fan.

  On the other hand, inexpensive and small-sized servers have become widespread, and servers are often installed in offices as well as server rooms. However, when a server is installed in the office, noise is generated from the server as described above, and many complaints about noise are generated from server users.

  A technique for coping with such a problem is disclosed in Patent Document 1. The technology controls the number of rotations of a fan that cools the shelf in accordance with the increase or decrease in the number of stages of the shelf on which the electronic circuit package is mounted and the power consumption of the electronic circuit package. With this technique, the number of rotations of the fan is not increased unnecessarily, and excessive cooling and accompanying noise can be prevented.

JP-A-6-272694

  However, in the technique disclosed in Patent Document 1, the power consumption of the electronic circuit package mounted on the shelf is calculated, and the rotational speed of the fan is controlled according to the calculation result. For this reason, the problem that the process in an electronic device becomes heavy has arisen. In addition, in order to evaluate the cooling effect by the fan in advance, it is necessary to consider a calculation formula used for calculating power consumption. Furthermore, when the types of parameters related to power consumption increase, the calculation formula becomes complicated, and there is a problem that it takes time for fan control processing.

  The present invention has been made to solve such a problem, and an object of the present invention is to provide an electronic device and a fan control method capable of reducing a processing load for suppressing noise caused by fan rotation. It is said.

  An electronic device according to the present invention is an electronic device in which an expansion device that expands a function can be mounted. The fan that cools the mounted expansion device, and the rotation speed of the fan according to the mounting configuration of the expansion device Comprises rotation speed information storage means for storing preset rotation speed information, and fan control means for controlling the rotation of the fan based on the configuration of the extension device and the rotation speed information. .

  A fan control method according to the present invention is a fan control method for cooling an electronic device that can be equipped with an expansion device that expands a function by blowing air from a fan, and the number of rotations of the fan according to the mounting configuration of the expansion device. Referring to preset rotation speed information, determining a rotation speed according to the configuration of the extension device mounted on the electronic device, and rotating the fan based on the determined rotation speed And a step of controlling.

  According to the present invention, it is possible to provide an electronic device and a fan control method capable of reducing a processing load for suppressing noise caused by fan rotation.

1 is a block diagram of an electronic device according to a first exemplary embodiment. 3 is a flowchart of a fan control method according to the first exemplary embodiment. It is a figure which shows the structural example of the server concerning Embodiment 2. FIG. 6 is a flowchart of a fan control method according to the second exemplary embodiment. It is a figure which shows the table of the rotation speed information concerning Embodiment 2. FIG. It is a figure which shows the table of the rotation speed information concerning Embodiment 2. FIG. It is a figure which shows the table of the rotation speed information concerning Embodiment 2. FIG.

Embodiment 1
Embodiments of the present invention will be described below with reference to the drawings. The electronic device 1 illustrated in FIG. 1 includes a rotation speed information storage unit 11, a fan control unit 12, and a fan 13. At this time, the electronic device 1 is a PC such as a server, for example, and has a configuration in which an expansion device can be mounted. Further, the expansion device is for expanding the functions of the electronic device 1 such as a memory, an HDD (Hard Disk Drive), and an expansion card.

  The rotational speed information storage unit 11 stores rotational speed information for determining the rotational speed of the fan 13 and is, for example, a memory. The rotation speed information corresponds to the configuration of the expansion device mounted on the electronic device 1, and the rotation number of the fan necessary for cooling the electronic device 1 and the expansion device having the configuration is determined in advance. Information.

  The fan control unit 12 controls the rotation of the fan 13 based on the configuration of the extension device mounted on the electronic device 1 and the rotation speed information.

  Next, an operation example of the electronic device 1 illustrated in FIG. 1 will be described with reference to the flowchart of FIG. First, the fan control unit 12 recognizes the configuration of the mounted expansion device, refers to the rotation number information stored in the rotation number information storage unit 11, and determines the rotation number of the fan according to the configuration of the expansion device. Determine (step S101). At this time, the configuration of the expansion device may be recognized by manually confirming the configuration and inputting it to the fan control unit 12, or detecting the configuration of the expansion device on which the electronic device 1 is mounted. You may make it recognize by transmitting a mounting structure to the fan control part 12. FIG.

  And the fan control part 12 controls rotation of the fan 13 so that it may become the determined rotation speed (step S102). Thereby, the fan 13 can be controlled so as to perform cooling according to the configuration of the mounted extension device. As a result, since the fan 13 is driven at the number of rotations necessary for cooling the mounted extension device without excessive cooling, useless noise can be suppressed.

  As described above, in the present embodiment, when the fan 13 is controlled, the fan control unit 12 refers to the rotation number information to determine the rotation number of the fan 13 and rotate it. As a result, it is possible to perform cooling suitable for the installation configuration of the extension device without performing a burdensome process of calculating the rotation speed of the fan 13 using the number of extension devices, the heat generation temperature, and the like inside the electronic device 1. it can.

Embodiment 2
A second embodiment according to the present invention will be described. FIG. 3 shows a configuration example when a server is used as the electronic apparatus. The server 2 in FIG. 3 includes a fan 13, a motherboard 21, a CMOS (Complementary Metal Oxide Semiconductor) 22, a card slot 23, a fan controller IC (Integrated Circuit) 24, and a housing 25. The CMOS 22, card slot 23, and fan controller IC 24 are arranged on the mother board 21. The motherboard 21 and the fan 13 are accommodated in a housing 25. Note that the electronic device is not limited to a server as long as an expansion device can be mounted, and the present invention can be applied to a terminal PC or the like.

  The CMOS 22 stores a BIOS (Basic Input Output System) that operates when the server 2 is started and issues a command for controlling the fan 13 and the like, and various BIOS setting programs (not shown). That is, the CMOS 22 has the rotation speed information described in the first embodiment, and corresponds to the rotation speed information storage unit 11.

  The card slot 23 is an insertion port for mounting expansion devices such as a memory, an HDD, and an expansion card in an electronic device. The card slot 23 and the CMOS 22 are connected, and the CMOS 22 can detect the mounting configuration of the card slot 23.

  The fan controller IC 24 controls the rotation of the fan 13 in accordance with a BIOS command. The BIOS and the fan controller IC 24 correspond to the fan control unit 12 shown in FIG.

  Next, an operation example of the server 2 shown in FIG. 3 will be described using the flowchart shown in FIG. First, when the server 2 is activated, the BIOS detects whether or not an expansion device is inserted in the card slot 23 and the configuration of the inserted expansion device (step S201).

  Next, the BIOS refers to the rotational speed information stored in the CMOS 22 and determines the rotational speed of the fan according to the detected mounting configuration (step S202). Here, an example of the rotation speed information is shown in FIG. The rotation speed information illustrated in FIG. 5 is table information in which the number of expansion devices mounted on the server 2 is used as the configuration of the expansion device, and the number of expansion devices and the rotation speed of the fan are associated with each other. . In the table information shown in FIG. 5, the number of fan rotations is set in accordance with the number of expansion devices mounted on the server 2. For example, when one expansion device is installed, the number of rotations of the fan 13 necessary for cooling the expansion device is 1000 rpm (every minute).

  Then, the BIOS outputs a control command to the fan controller IC 24 so that the rotational speed of the fan becomes the determined rotational speed (step S203). The fan controller IC 24 controls the rotation of the fan 13 based on the command (step S204). Thus, the air in the housing | casing 25 is sent outside by the fan 13 rotating. Thereby, the heat generated in the expansion device can be released. Note that giving instructions to the fan controller IC 24 is not limited to the BIOS, but may be a server management controller or the like.

  With such a configuration, the present invention can be applied to a server which is an electronic device having high expandability. Therefore, it is possible to control the rotation of the fan 13 according to the expanded configuration, and it is possible to reduce noise caused by the rotation of the fan 13 while satisfying the cooling of the server 2.

  Further, the configuration of the rotation speed information may be multidimensional. A case where the electronic device has a configuration in which up to four memories, HDDs, and expansion cards can be mounted will be described as an example. At this time, the rotation speed information is assumed to be table information for determining the rotation speed of the fan 13 as shown in FIG. In the table information of FIG. 6, the number of rotations of the fan 13 is set according to the number of each type of expansion device. For example, when two expansion cards, two memories, and four HDDs are installed in the electronic device, the rotational speed of the fan 13 necessary for cooling these expansion devices is 2000 rpm. By using such multi-dimensional table information, it is possible to control the fan 13 corresponding not only to the number and number of expansion devices but also to the type thereof, and to control the rotation of the fan in detail.

  Further, the rotation speed of the fan may be given a width instead of one rotation speed for one mounting configuration. For example, in the electronic device having the same expandability as the example shown in FIG. 6, the rotation speed information as shown in FIG. 7 may be used. In the table information shown in FIG. 7, the maximum fan rotation speed (upper limit) and the minimum fan rotation speed (lower limit) of the rotation speed of the fan 13 corresponding to the mounting configuration are set. For example, if the electronic device has one expansion card, three memories, and one HDD, the fan setting is 3. That is, the fan control unit 12 controls the fan 13 to rotate at a rotational speed between 2000 rpm and 2500 rpm. By using such rotation speed information, the rotation speed of the fan 13 can be adjusted in more detail according to the operation rate of the electronic device and the expansion device even in the same mounting configuration. In addition, further noise reduction can be achieved.

  Note that the present invention is not limited to the above-described embodiment, and can be changed as appropriate without departing from the spirit of the present invention. For example, the value of the rotational speed is not limited to the rotational speed as shown in FIGS. 5 to 7, but is a ratio (for example, percentage) to the maximum rotational speed in the performance of the fan and the air volume of the fan. May be. The numerical values in the tables shown in FIG. 5 to FIG. 7 are examples, and the present invention is not limited to this. The rotation speed information can be arbitrarily set according to the specifications of the electronic device and the extended device.

DESCRIPTION OF SYMBOLS 1 Electronic device 2 Server 11 Speed information storage part 12 Fan control part 13 Fan 21 Motherboard 22 CMOS
23 Card slot 24 Fan controller IC
25 housing

Claims (8)

An electronic device that can be equipped with an expansion device that expands its functions,
A fan that cools the mounted extension device;
Rotational speed information storage means for storing rotational speed information in which the rotational speed of the fan according to the mounting configuration of the extension device is preset;
Fan control means for controlling the rotation of the fan based on the configuration of the extension device and the rotational speed information ,
The electronic device in which the rotation speed range specified by the upper limit and the lower limit of the rotation speed of the fan is associated with one of the mounting configurations in the rotation speed information .   The electronic device according to claim 1, wherein the rotation speed information is information in which the number of the extension devices mounted on the electronic device is associated with the rotation speed of the fan. The electronic device can be equipped with different types of expansion devices,
The electronic device according to claim 1, wherein the rotation speed information is information in which a number for each type of the extension device mounted on the electronic device is associated with a rotation speed of the fan. The electronic device according to any one of claims 1 to 3 , further comprising a configuration detection unit that detects a configuration of the mounted extension device. A fan control method for cooling an electronic device capable of mounting an expansion device that expands a function by blowing air from a fan,
Determining the number of rotations according to the configuration of the expansion device mounted on the electronic device with reference to rotation number information in which the rotation number of the fan according to the configuration of the expansion device is set in advance;
Controlling the rotation of the fan based on the determined number of rotations,
A fan control method in which, in the rotation speed information, a range of rotation speeds specified by an upper limit and a lower limit of the rotation speed of the fan is associated with one mounting configuration . The fan control method according to claim 5 , wherein the rotation speed information is information in which the number of the extension devices mounted on the electronic device is associated with the rotation speed of the fan. The electronic device can be equipped with different types of expansion devices,
The fan control method according to claim 5 or 6 , wherein the rotation speed information is information in which a number for each type of the extension device mounted on the electronic device is associated with a rotation speed of the fan. The said fan control method is a fan control method as described in any one of Claims 5-7 further equipped with the step which detects the structure of the said extended apparatus mounted in the said electronic device.

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