JP5381436B2 - Heat dissipation device - Google Patents

Description

  The present invention relates to a heat dissipation device for electronic equipment.

  Electronic devices such as personal computers and audio devices are provided with heat generating members such as an amplifier, a hard disk drive (HDD), a CPU, a chip component, and a DVD drive. By operating these heat generating members, heat is accumulated inside, and heat is generated as time passes. When heat is released from such a heat generating member, the inside of the electronic device casing becomes extremely hot. If the temperature inside the electronic device casing becomes high, it may cause malfunction of electronic components, devices, and the like. Therefore, various measures against heat generation are implemented in the electronic device. Generally, a fan is disposed in the vicinity of the heat generating member, and an air flow path is formed by the fan, whereby cold air is supplied to the heat generating member and the heat generating member is dissipated.

  In Patent Document 1 below, air is sucked into the housing from the suction port 16 by the fan 8 to radiate heat from the amplifier unit 2 and the HDD 5, and air inside the housing is discharged from the exhaust port 17 to the outside by the exhaust fan 9. A heat radiating device for radiating heat from the CPU provided on the mother board 4 will be described. Here, as a method for controlling the rotational speed of the fan 8, it is proposed to detect the temperature of the amplifier unit 2 with a temperature sensor and control the rotational speed of the fan 8 based on the temperature of the amplifier unit 2. Similarly, as a method for controlling the rotational speed of the exhaust fan 9, it has been proposed to detect the temperature of the CPU with a temperature sensor and control the rotational speed of the exhaust fan 9 based on the temperature of the CPU.

  However, even if it is detected that the temperature of the amplifier unit 2 is high and the rotation speed of the fan 8 is controlled at a high speed, the rotation speed of the exhaust fan 9 is low because the CPU temperature is not so high. In some cases, the amplifier section 2 cannot be efficiently radiated. That is, both the fan 8 and the exhaust fan 9 rotate at high speed in the casing, and external air is sucked into the casing from the suction port 16 at high speed, and the air inside the casing is discharged from the exhaust port 17 to the outside at high speed. Only when this is done, the flow of air in the housing becomes faster, and the amplifier section 2 can be efficiently dissipated. However, if the rotational speed of the exhaust fan 9 is low, even if the rotational speed of the fan 8 is controlled at a high speed, the flow of air in the housing cannot be increased. It cannot dissipate heat efficiently. In addition, by controlling the rotational speed of the fan 8 at a high speed, noise caused by the fan 8 increases.

WO2009 / 028434 Japanese Patent Laid-Open No. 10-307648

  The present invention has been made in order to solve the above-described conventional problems, and an object thereof is to provide a heat dissipation device that efficiently dissipates heat from a heat generating member.

Radiating device according to the preferred embodiment of the present invention, the heat radiation a heat dissipation device comprising a suction port and an exhaust port is formed casing, a first heating member, and a second heating member, at least the first heating member A first temperature detecting means for detecting the temperature of the first heat generating member, a second fan for radiating at least the second heat generating member, and detecting the temperature of the second heat generating member. And a second temperature detecting means that is attached together in one space defined by the housing and rotates the first fan based on the temperature of the first heating member detected by the first temperature detecting means. controls, further comprising a fan controller that controls the rotation of the second fan based on the temperature of the second heating member detected by the temperature and the second temperature detecting means of the first heat generating member, the full When the temperature of the first heat generating member is equal to or higher than a first predetermined temperature, the engine control means sets the rotational speed of the first fan to the first rotational speed, and the temperature of the first heat generating member is set to the first temperature. When the temperature is lower than a predetermined temperature, the rotation speed of the first fan is set to a second rotation speed that is lower than the first rotation speed, and the fan control means sets the temperature of the second heat generating member to a third predetermined speed. When the temperature is equal to or higher than the temperature, or when the temperature of the first heat generating member is equal to or higher than a second predetermined temperature that is equal to or higher than the first predetermined temperature, the rotational speed of the second fan is set to a third rotational speed, When the temperature of the second heat generating member is lower than the third predetermined temperature and the temperature of the first heat generating member is lower than the second predetermined temperature, the rotational speed of the second fan is made higher than the third rotational speed. Is also set to the fourth rotational speed, which is a low speed.

  If the rotation speed of the second fan is low (fourth rotation speed), the rotation speed of the first fan is controlled to high speed (first rotation speed), and air is sucked into the housing at high speed from the suction port. Since air cannot be discharged from the exhaust port at high speed, the air in the housing 1 cannot move at high speed, and the first heat generating member cannot be efficiently radiated. Therefore, in this embodiment, when the temperature of the first heat generating member is equal to or higher than the second predetermined temperature, the rotation speed of the second fan is set to a high speed (third rotation speed). As a result, the rotation speed of the first fan is set to a high speed (first rotation speed) and the rotation speed of the second fan is set to a high speed (third rotation speed), and air is sucked into the housing at a high speed from the suction port. Since air can be discharged from the mouth at high speed, the air in the housing can move at high speed, and the first heat generating member can be efficiently radiated.

  In a preferred embodiment, the fan control means controls the rotation of the first fan based on the temperature of the first heat generating member, the temperature of the first heat generating member, and the second heat generating member. A second control unit that controls the rotation of the second fan based on the temperature of the first fan, and the first control unit notifies the temperature of the first heat generating member to the second control unit.

  In a preferred embodiment, since the temperature of the second heat generating member is lower than the third predetermined temperature but the temperature of the first heat generating member is equal to or higher than the second predetermined temperature, the fan control means is configured to perform the second operation. After setting the rotational speed of the fan to the third rotational speed, it is determined whether or not the temperature of the first heat generating member has decreased, and if the temperature of the first heat generating member has not decreased, the first The rotational speed of the two fans is set to the fourth rotational speed.

  If the temperature of the first heat generating member is not lowered, it is meaningless to set the rotation speed of the second fan at a high speed. Rather, by increasing the rotation speed of the second fan, noise from the second fan is generated. It has increased. Therefore, the noise caused by the second fan can be reduced by setting the rotation speed of the second fan to a low speed (fourth rotation speed).

  In a preferred embodiment, the first heat generating member is an amplifier unit, and the second heat generating member is a CPU.

  The temperature of the amplifier rises when the level of the audio signal is high or when the volume value is large. In this case, the temperature of the CPU does not rise much. That is, the correlation between the amplifier temperature and the CPU temperature is low. Therefore, if the rotational speed of the second fan is controlled based on the temperature of only the CPU, the amplifier cannot efficiently dissipate heat. Therefore, the above effect becomes more remarkable by controlling the rotation speed of the second fan not only based on the temperature of the CPU but also based on the temperature of the amplifier.

  According to the present invention, the heat generating member can be efficiently radiated.

  Hereinafter, preferred embodiments of the present invention will be specifically described with reference to the drawings. However, the present invention is not limited to these embodiments. FIG. 1 is a diagram of a personal computer (hereinafter referred to as a personal computer) 100 to which a heat dissipation device according to a preferred embodiment of the present invention is applied. FIG. 1A is a sectional view when viewed from the left side, and FIG. 1C is a cross-sectional view showing the air flow path, FIG. 1D is a plan view when the lower chassis 12 is viewed from the inside of the personal computer 100, and FIG. 1E is a cross-sectional view of the case member 6. FIG. 2 is a block diagram showing a hardware configuration of the personal computer 100. In this example, the front panel 11 side is referred to as a front side, the rear panel 13 side is referred to as a rear side, and the front panel 11 is referred to as a right side and a left side when viewed from the front.

  As shown in FIG. 1, a personal computer 100 includes a casing 1 formed in a substantially rectangular parallelepiped shape, an amplifier unit 2, a power transformer 3, a mother board 4, a hard disk drive (hereinafter referred to as HDD) 5, and the like. Case member 6 for housing HDD 5 and fan 8, cover member 7 for covering case member 6, fan (first fan) 8, exhaust fan (second fan) 9, duct member 10, It has.

  The housing 1 includes a front panel 11, a lower chassis 12, a rear panel 13, a front bracket 14, a side chassis 15, a front chassis 24, and a top plate (not shown), which are combined to form a housing. A body 1 is formed. A front bracket 14 and a front chassis 24 are attached to the back of the front panel 11 inside the housing 1.

  As shown in FIG. 1 or FIG. 2, an amplifier unit 2, a power transformer 3, a motherboard 4, a microcomputer 20, and the like are attached to the lower chassis 12.

  The amplifier unit 2 is one of the heat generating members, and receives a music signal reproduced based on a music file recorded in the HDD 5 or an audio signal input from an audio input terminal provided on the rear panel 13. Amplify. The audio signal amplified by the amplifier unit 2 is supplied to a speaker (not shown) connected to a speaker terminal provided on the rear panel 13 and reproduced as audio. As shown in FIG. 1D, the amplifier unit 2 is attached to a position on the upper left side of the lower chassis 12 on the front left side.

  As shown in FIG. 2, an amplifier temperature sensor 2 a for detecting the temperature of the amplifier unit 2 is provided in the vicinity (periphery) of the amplifier unit 2. The temperature information of the amplifier unit 2 detected by the amplifier unit temperature sensor 2 a is supplied to the microcomputer 20 and used as a condition for controlling the rotational speed of the fan 8. Further, the temperature information of the amplifier unit 2 is transmitted from the microcomputer 20 to the CPU 4 a and used as a condition for controlling the rotational speed of the exhaust fan 9.

  The power transformer 3 is one of the heat generating members, and transforms the supplied AC power voltage in accordance with the turn ratio of the primary winding and the secondary winding. As shown in FIG. 1D, the power transformer 3 is attached to the upper right side of the lower chassis 12 at the front right position.

  A plurality of music files are recorded in the HDD 5 and programs such as an OS (Operating System) and a music playback application are installed.

  The fan 8 is for radiating heat at least from the amplifier unit 2 and the HDD 5 by sucking outside air from a suction port 16 to be described later, and the rotational speed thereof is controlled by the microcomputer 20. For example, the rotational speed of the fan 8 can be set in three stages: high speed (rotational speed F1), low speed (rotational speed F2), and stop. Specifically, the fan 8 rotates at a rotation speed determined by the microcomputer 20 based on the temperature of the amplifier unit 2.

  The mother board 4 is constituted by a printed circuit board formed in a substantially rectangular flat plate shape. As shown in FIG. 2, the mother board 4 includes a CPU 4a, a sound card 4b, a CPU temperature sensor 4c, a memory (ROM, RAM) 4d, a heat sink, and a power circuit component (a capacitor or a resistor). Etc.) is mounted. As shown in FIG. 1D, the mother board 4 is attached to the upper surface of the lower chassis 12 at a position on the rear side.

  The CPU temperature sensor 4c is provided in the vicinity (periphery) of the CPU 4a and detects the temperature of the CPU 4a. The temperature information of the CPU 4a detected by the CPU temperature sensor 4c is supplied to the CPU 4a and used as a condition for controlling the rotational speed of the exhaust fan 9. The CPU temperature sensor 4c may be provided inside the CPU 4a.

  A duct member 10 bent in a substantially L shape is provided above the mother board 4 as shown in FIG. 1B. An exhaust fan 9 is attached to the opening of the duct member 10 facing the mother board 4 so as to be horizontal with respect to the lower chassis 12. The rear panel 13 is formed with a plurality of exhaust ports 17 at positions facing the other opening of the duct member 10. The warmed air in the housing 1 by the exhaust fan 9 and the duct member 10 is discharged to the outside of the housing 1 through the exhaust port 17. In addition, when the exhaust fan 9 is directly attached to the position of the exhaust port 17 of the rear panel 13, the duct member 10 is unnecessary.

  The exhaust fan 9 radiates at least the heat generating member (CPU 4 a) mounted on the mother board 4 by releasing air inside the housing 1 (particularly air above the mother board) from the exhaust port 17. In addition, the exhaust fan 9 operates to promote the movement of air from the front side to the rear side of the housing 1 by the fan 8 and contribute to the heat radiation of the amplifier unit 2 and the HDD 5.

  The microcomputer 20 controls the operations of the amplifier unit 2 and the fan 8 based on a program stored in a memory such as a ROM (not shown). The microcomputer 20 controls the operation of the fan 8 based on the temperature information of the amplifier unit 2 supplied from the amplifier temperature sensor 2a (controls on / off of the fan 8 and the rotation speed of the fan 8).

  FIG. 3 is a diagram illustrating a relationship between the temperature of the amplifier unit 2 and the rotation speed of the fan 8. The rotation speed has a relationship of F1> F2. The microcomputer 20 controls the rotational speed of the fan 8 to a high speed (rotational speed F1) when the temperature of the amplifier unit 2 is equal to or higher than the predetermined temperature A1 ° C. The microcomputer 20 controls the rotational speed of the fan 8 to a low speed (the rotational speed F2 and the rotational speed F2 may be 0, that is, stop) when the temperature of the amplifier unit 2 is lower than the predetermined temperature A1 ° C.

  The CPU 4a controls the operation of the entire personal computer 100 (or OS) based on a program stored in the memory 4d or the HDD 5. The CPU 4a controls the operation of the exhaust fan 9 based on the temperature information of the CPU 4a supplied from the CPU temperature sensor 4c (controls the rotation on / off of the exhaust fan 9 and the rotation speed of the exhaust fan 9). The CPU 4a controls the operation of the exhaust fan 9 based on the temperature information of the amplifier unit 2 transmitted from the microcomputer 20 (controls the rotational speed of the exhaust fan 9).

  FIG. 4 is a diagram showing the relationship among the temperature of the CPU 4 a, the temperature of the amplifier unit 2, and the rotational speed of the exhaust fan 9. The predetermined temperature A2 is a value equal to or higher than A1, and the rotational speed has a relationship of G1> G2. The CPU 4a controls the rotational speed of the exhaust fan 9 to a high speed (rotational speed G1) when the temperature of the CPU 4a is equal to or higher than the predetermined temperature B ° C. The CPU 4a reduces the rotational speed of the exhaust fan 9 when the temperature of the CPU 4a is lower than the predetermined temperature B ° C and the temperature of the amplifier unit 2 is lower than the predetermined temperature A2 ° C (the rotational speed G2 and the rotational speed G2 are 0, that is, it may be stopped.)

  The CPU 4a controls the rotational speed of the exhaust fan 9 to a high speed (rotational speed G1) when the temperature of the amplifier unit 2 is equal to or higher than the predetermined temperature A2 ° C. As a result, when the temperature of the amplifier unit 2 is A2 ° C. or higher (at this time, the rotation speed of the fan 8 is high (rotation speed F1)), the exhaust fan 9 even if the temperature of the CPU 4a is less than B ° C. By making the rotational speed of the high speed (rotational speed G1), the movement of the air in the housing can be made fast, and the amplifier unit 2 can be efficiently dissipated. That is, when the rotation speed of the fan 8 is high (rotation speed F1), the air is discharged from the suction port 16 into the housing 1 by controlling the rotation speed of the exhaust fan 9 to high speed (rotation speed G1). Since the air is sucked at high speed and passes through the inside of the housing 1 and is discharged from the exhaust port 17 to the outside at high speed, the amplifier section 2 can be efficiently dissipated.

  As shown in FIG. 1A, the HDD 5 and the fan 8 are housed in a case member 6, and the case member 6 is disposed on the upper surface of the side chassis 15 and the front chassis 24, and then the upper part is covered by the cover member 7. The opening is covered and joined to the side chassis 15 together with the cover member 7 by screws.

  As shown in FIGS. 1A and 1B, the lower chassis 12 is formed with a plurality of suction ports 16 extending in the left-right direction at the front end. The suction port 16 is for sucking outside air into the housing 1 based on the suction force of the fan 8. Although any appropriate shape and number can be adopted as the shape and number of the suction ports 16 according to the amount of air sucked from the outside, nine oval suction ports 16 are formed in this example. Although not limited, a leg (not shown) (or other means for floating the lower chassis 12 from the installation surface of the personal computer 100) is attached to the back surface of the lower chassis 12, and the suction port 16 is not blocked. It is like that. The amplifier unit 2 and the power transformer 3 are attached slightly behind the suction port 16 so as not to block the suction port 16.

  The case member 6 detachably houses the HDD 5 so that the HDD 5 can be replaced, and is detachably attached to the side chassis 15 of the housing 1. Furthermore, the case member 6 forms a flow path A for radiating heat from the HDD 5 and a flow path B for radiating heat from the amplifier unit 2 and the power transformer 3 as shown in FIG. 1C. When the fan 8 is accommodated in the fan accommodating portion 6b, as shown in FIG. 1E, a part of the fan 8 (upper portion, for example, the upper half) faces the HDD accommodating portion 6a (the HDD 5 and the opening 6d). The other part (lower part, for example, lower half) of the fan 8 faces the cylindrical part 6c (opening 6e). That is, the upper half of the fan 8 functions to release the air in the HDD housing portion 6a to the outside through the opening 6f, and the lower half of the fan 8 has the air from the opening 6e to the outside through the opening 6f. Function to release. As a result, by driving the fan 8, the following two air flow paths A and B are formed as shown in FIG. 1C.

  In the flow path A, air taken into the housing 1 from the suction port 16 of the lower chassis 12 enters the HDD housing 6a via the opening 6d (not through the position of the amplifier unit 2 or the power transformer 3). This is a flow path that is sucked and discharged from the opening 6f to the rear of the case member 6 through the fan housing 6b. The HDD 5 is radiated by the air flowing through the flow path A. The flow path B is such that air taken into the housing 1 from the suction port 16 of the lower chassis 12 passes through the opening 6e via the position of the amplifier unit 2 and the power transformer 3 (not through the HDD housing unit 6a). This is a flow path that is sucked into the cylindrical portion 6c and discharged from the opening 6f to the rear of the case member 6 through the fan housing portion 6b. The air flowing through the flow path B radiates heat from the amplifier unit 2 and the power transformer 3 disposed on the flow path B. By adopting such a structure of the case member 6, two flow paths A and B separated from each other are formed.

  In addition, by providing the cylindrical portion 6c, it is possible to prevent the air released from the opening 6f from flowing around to the front side and being sucked into the case member 6 from the opening 6e again. That is, by providing the cylindrical portion 6c, the air discharged from the opening 6f is taken into the duct member 10 provided at the rear.

  The operation of the heat dissipation device of the personal computer 100 having the above configuration will be described with reference to FIG. 1C. When the fan 8 is driven, the air warmed by the HDD 5 inside the HDD housing portion 6a of the case member 6 moves backward in the HDD housing portion 6a as indicated by an arrow A by the suction force of the fan 8. Then, it is discharged to the outside of the case member 6 through the fan housing portion 6b and the opening 6f. As indicated by an arrow A, cold air outside the housing 1 is sucked into the housing 1 from the suction port 16 of the lower chassis 12, and the cold air is taken into the HDD housing 6a through the opening 6d. It is. As described above, in the HDD storage portion 6a, the air warmed by the HDD 5 is discharged to the outside of the case member 6, and the cold air sucked from the outside is taken in, whereby the HDD 5 stored in the HDD storage portion 6a is stored. It can dissipate heat.

  Further, when the fan 8 is driven, the surroundings of the amplifier unit 2 and the power transformer 3 arranged in a substantially straight region (on the flow path B) connecting the suction port 16 and the opening 16e by the suction force of the fan 8 As shown by the arrow B, the warmed air is taken into the cylindrical portion 6c through the opening 6e and discharged to the outside of the case member 6 through the fan housing portion 6b and the opening 6f. Then, as shown by an arrow B, cold air outside the housing 1 is sucked into the housing 1 from the suction port 16 of the lower chassis 12, and the cold air is taken around the amplifier unit 2 and the power transformer 3. . As described above, on the lower side of the case member 6, the air heated by the amplifier unit 2 and the power transformer 3 is discharged to the rear of the case member 6 through the cylindrical portion 6c of the case member 6, and is sucked from the outside. By taking in cold air, it is possible to dissipate heat from the amplifier unit 2 and the power transformer 3 disposed below the case member 6.

  When the exhaust fan 9 is driven, warm air released from the rear surface of the case member 6 by the fan 8 is sucked into the duct member 10 by the suction force of the exhaust fan 9. Since the exhaust port 17 of the rear panel 13 is located at the rear opening of the duct member 10, the warm air taken into the duct member 10 moves through the duct member 10 and is connected to the housing 1 via the exhaust port 17. Released to the outside. Further, when the exhaust fan 9 is driven, the warmed air around the CPU arranged on the mother board 4 moves in the duct 10 and is released to the outside of the housing 1 through the exhaust port 17. The Therefore, the CPU can be radiated by driving the exhaust fan 9.

  Next, the operation in which the microcomputer 20 controls the rotation speed of the fan 8 based on the temperature information of the amplifier unit 2 will be described with reference to the flowchart of FIG.

  The microcomputer 20 sets the rotational speed of the fan 8 to a low speed (rotational speed F2) as an initial state (S1). The microcomputer 20 acquires the temperature information of the amplifier unit 2 from the amplifier temperature sensor 2a (S2). The microcomputer 20 transmits the acquired temperature information of the amplifier unit 2 to the CPU 4a (S3). The microcomputer 20 determines whether or not the temperature of the amplifier unit 2 is equal to or higher than a predetermined temperature A1 ° C. (S4). When the temperature of the amplifier unit 2 is equal to or higher than the predetermined temperature A1 ° C. (YES in S4), the microcomputer 20 sets the rotational speed of the fan 8 to a high speed (rotational speed F1) (S5). By controlling the rotational speed of the fan 8 at a high speed, the air sucked from the suction port 16 moves at high speed around the amplifier section 2, so that the amplifier section 2 can efficiently dissipate heat. On the other hand, when the temperature of the amplifier unit 2 is lower than the predetermined temperature A1 ° C. (NO in S4), the microcomputer 20 sets the rotational speed of the fan 8 to a low speed (rotational speed F2) (S6). The microcomputer 20 controls the rotation speed of the fan 8 according to the temperature of the amplifier unit 2 by continuously executing the processes of S2 to S6.

  Next, the operation of the CPU 4a controlling the rotational speed of the exhaust fan 9 based on the temperature information of the CPU 4a and the temperature information of the amplifier unit 2 will be described with reference to the flowchart of FIG.

  The CPU 4a sets the rotational speed of the exhaust fan 9 to a low speed (rotational speed G2) as an initial state (S11). The CPU 4a acquires the temperature information of the CPU 4a from the CPU temperature sensor 4c (S12). The CPU 4a receives the temperature information of the amplifier unit 2 from the microcomputer 20 (S13). The CPU 4a determines whether or not the temperature of the CPU 4a is equal to or higher than a predetermined temperature B ° C. (S14). When the temperature of the CPU 4a is equal to or higher than the predetermined temperature B ° C (YES in S14), the CPU 4a sets the rotation speed of the exhaust fan 9 to a high speed (rotation speed G1) (S16). By controlling the rotational speed of the exhaust fan 9 at a high speed, the warmed air around the CPU 4a is exhausted at a high speed from the exhaust port 17, so that the CPU 4a can be radiated efficiently.

  When the temperature of the CPU 4a is lower than the predetermined temperature B ° C (NO in S14), the CPU 4a determines whether or not the temperature of the amplifier unit 2 is equal to or higher than the predetermined temperature A2 ° C (S15). When the temperature of the amplifier unit 2 is equal to or higher than the predetermined temperature A2 ° C. (YES in S15), if the rotation speed of the exhaust fan 9 is low (rotation speed G2), the rotation speed of the fan 8 is high (rotation speed F1). ), The air in the housing 1 can move at high speed because the air cannot be discharged from the exhaust port 17 at high speed even if air is sucked into the housing 1 from the suction port at high speed. Therefore, the amplifier unit 2 cannot be radiated efficiently. Therefore, in this embodiment, in this case, the CPU 4a sets the rotational speed of the exhaust fan 9 to a high speed (rotational speed G1) (S16). As a result, the rotational speed of the fan 8 is set to a high speed (rotational speed F1) and the rotational speed of the exhaust fan 9 is set to a high speed (rotational speed G1), and air is sucked into the housing 1 from the suction port at a high speed. Since air can be discharged from the opening 17 at high speed, the air in the housing 1 can move at high speed, and the amplifier section 2 can be efficiently radiated.

  On the other hand, when the temperature of the amplifier unit 2 is lower than the predetermined temperature A2 ° C. (NO in S15), the CPU 4a sets the rotational speed of the exhaust fan 9 to a low speed (rotational speed G2) (S17). The CPU 4a controls the rotational speed of the exhaust fan 9 according to the temperatures of the CPU 4a and the amplifier unit 2 by continuously executing the processes of S12 to S17.

  As described above, according to the present invention, when the temperature of the amplifier unit 2 is equal to or higher than the predetermined temperature A2 ° C., the rotational speeds of the fan 8 and the exhaust fan 9 are set to be high, thereby Heat can be radiated efficiently.

  FIG. 7 is a flowchart showing the operation of the CPU 4a according to another embodiment. The operation of the microcomputer 20 is the same as that in FIG.

  The CPU 4a sets the rotational speed of the exhaust fan 9 to a low speed (rotational speed G2) as an initial state (S21). The CPU 4a acquires the temperature information of the CPU 4a from the CPU temperature sensor 4c (S22). The CPU 4a receives the temperature information of the amplifier unit 2 from the microcomputer 20 (S23). The CPU 4a determines whether or not the temperature of the CPU 4a is equal to or higher than a predetermined temperature B ° C. (S24). When the temperature of the CPU 4a is equal to or higher than the predetermined temperature B ° C. (YES in S24), the CPU 4a sets the rotational speed of the exhaust fan 9 to a high speed (rotational speed G1) (S25). By controlling the rotational speed of the exhaust fan 9 at a high speed, the warmed air around the CPU 4a is exhausted at a high speed from the exhaust port 17, so that the CPU 4a can be radiated efficiently.

  When the temperature of the CPU 4a is lower than the predetermined temperature B ° C. (NO in S24). The CPU 4a determines whether or not the temperature of the amplifier unit 2 is equal to or higher than a predetermined temperature A2 ° C. (S26). When the temperature of the amplifier unit 2 is equal to or higher than the predetermined temperature A2 ° C. (YES in S26), the CPU 4a sets the rotational speed of the exhaust fan 9 to high speed (rotational speed G1) (S27). As a result, the rotational speed of the fan 8 is set to a high speed (rotational speed F1) and the rotational speed of the exhaust fan 9 is set to a high speed (rotational speed G1), and air is sucked into the housing 1 from the suction port at a high speed. Since air can be discharged from the opening 17 at high speed, the air in the housing 1 can move at high speed, and the amplifier section 2 can be efficiently radiated.

  The CPU 4a receives again the temperature information of the amplifier unit 2 from the microcomputer 20 (S28). The CPU 4a compares the temperature information of the amplifier unit 2 received in S23 with the temperature information of the amplifier unit 2 received in S28, and sets the rotational speed of the exhaust fan 9 to a high speed in S27. Is radiated and it is determined whether or not the temperature of the amplifier unit 2 has decreased (S29). If the temperature of the amplifier unit 2 has decreased (YES in S29), it means that the rotational speed of the exhaust fan 9 has been set to a high speed, and the process returns to S22. On the other hand, if the temperature of the amplifier unit 2 has not decreased (NO in S29), it does not make sense to set the rotational speed of the exhaust fan 9 to a high speed, but rather increase the rotational speed of the exhaust fan 9 to a high speed. As a result, noise from the exhaust fan 9 is increased. Therefore, the CPU 4a reduces the noise caused by the exhaust fan 9 by setting the rotational speed of the exhaust fan 9 to a low speed (rotational speed G2) (S30). In this case, the CPU 4a instructs the microcomputer 20 to set the rotation speed of the fan 8 to a very high speed (rotation speed F0> F1), and the microcomputer 20 accordingly sets the rotation speed of the fan 8 to a very high speed. (Rotational speed F0> F1) may be set.

  On the other hand, when the temperature of the amplifier unit 2 is lower than the predetermined temperature A2 ° C. (NO in S26), the CPU 4a sets the rotational speed of the exhaust fan 9 to a low speed (rotational speed G2) (S30). The CPU 4a controls the rotation speed of the exhaust fan 9 according to the temperatures of the CPU 4a and the amplifier unit 2 by continuously executing the processes of S22 to S30.

  As mentioned above, although preferable embodiment of this invention was described, this invention is not limited to these embodiment. For example, either the CPU 4 a or the microcomputer 20 may control the rotational speeds of both the fan 8 and the exhaust fan 9. The rotational speeds of the fan 8 and the exhaust fan 9 may be set to 4 stages, 5 stages, or the like. The direction of rotation of the fan 8 and the exhaust fan 9 may be reversed. That is, outside air may be sucked into the housing from the opening 17 and air inside the housing may be released to the outside through the opening 16. The heat generating member is not limited to the amplifier unit 2 and the CPU 4a, but may be an HDD, another chip component, a DVD drive, or the like. In the configuration of FIG. 1, the arrangement of the amplifier unit 2 and the HDD 5 may be reversed. The present invention may be applied to electronic devices other than personal computers, such as HDD recorders, amplifiers, and AV amplifiers.

  The present invention can be particularly suitably applied to a heat dissipation device such as a personal computer, an AV amplifier, and an amplifier.

It is sectional drawing which shows the personal computer 100 by preferable embodiment of this invention. It is sectional drawing which shows the personal computer 100 by preferable embodiment of this invention. It is a figure explaining the flow paths A and B formed by the case member 6 and the fan 8. FIG. FIG. 5 is a plan view for explaining components attached on the lower chassis 12. It is sectional drawing which looked at the case member 6 from the left side. 2 is a block diagram showing a hardware configuration of a personal computer 100. FIG. 6 is a table showing control conditions for the fan 8. 6 is a table showing control conditions for the exhaust fan 9; 4 is a flowchart showing a control operation of the fan 8 by the microcomputer 20. It is a flowchart which shows the control action of the exhaust fan 9 by CPU4a. It is a flowchart which shows control operation of the exhaust fan 9 by CPU4a by another embodiment.

DESCRIPTION OF SYMBOLS 100 PC 1 Housing | casing 2 Amplifier part 2a Temperature sensor for amplifier parts 3 Power supply transformer 4 Mother board 4a CPU
4c CPU temperature sensor 5 HDD
6 Case member 7 Cover member 8 Fan 9 Exhaust fan 10 Duct member 11 Front panel 12 Lower chassis 13 Rear panel 14 Front bracket 15 Side chassis 16 Suction port 17 Exhaust port 20 Microcomputer 24 Front chassis

Claims (4)

A heat dissipating device including a housing in which an inlet and an exhaust port are formed,
A first heating member and a second heating member;
A first fan for radiating at least the first heat generating member;
First temperature detecting means for detecting the temperature of the first heat generating member;
A second fan for radiating at least the second heat generating member;
A second temperature detecting means for detecting the temperature of the second heat generating member is attached together in one space defined by the housing;
The rotation of the first fan is controlled based on the temperature of the first heat generating member detected by the first temperature detecting means, and the first temperature detected by the temperature of the first heat generating member and the second temperature detecting means. 2 further comprising fan control means for controlling the rotation of the second fan based on the temperature of the heat generating member;
The fan control means sets the rotation speed of the first fan to a first rotation speed when the temperature of the first heat generation member is equal to or higher than a first predetermined temperature, and the temperature of the first heat generation member is the first temperature. If the temperature is lower than a predetermined temperature, the rotational speed of the first fan is set to a second rotational speed that is lower than the first rotational speed,
When the temperature of the second heat generating member is equal to or higher than a third predetermined temperature, or the temperature of the first heat generating member is equal to or higher than a second predetermined temperature that is equal to or higher than the first predetermined temperature, The rotation speed of the second fan is set to a third rotation speed, the temperature of the second heat generating member is lower than the third predetermined temperature, and the temperature of the first heat generating member is lower than the second predetermined temperature. In some cases, the heat dissipation device sets the rotation speed of the second fan to a fourth rotation speed that is lower than the third rotation speed. The fan control means controls the rotation of the first fan based on the temperature of the first heat generating member, and based on the temperature of the first heat generating member and the temperature of the second heat generating member. A second control unit for controlling the rotation of the second fan,
The heat dissipation device according to claim 1, wherein the first control unit notifies the second control unit of the temperature of the first heat generating member.   The fan control means sets the rotation speed of the second fan to a second speed because the temperature of the second heat generating member is lower than the third predetermined temperature but the temperature of the first heat generating member is equal to or higher than the second predetermined temperature. After setting to 3 rotation speeds, it is determined whether or not the temperature of the first heat generating member has decreased. If the temperature of the first heat generating member has not decreased, the rotation speed of the second fan is set to The heat radiating device according to claim 1, wherein the heat radiating device is set to the fourth rotation speed.   The heat radiating device according to claim 1, wherein the first heat generating member is an amplifier unit and the second heat generating member is a CPU.

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