JP3060997U - Fan radiator for integrated circuits - Google Patents

Abstract

PROBLEM TO BE SOLVED: To protect a central processing unit from a high temperature by adjusting a rotation speed of a fan of an integrated circuit in accordance with a load of an integrated circuit and an ambient temperature, and the central processing unit is down or malfunctions. Not to be. A load measurement electric circuit is electrically connected to an integrated circuit, and measures a load of the integrated circuit to generate a load signal. The temperature measurement electric circuit measures a difference between the surface temperature of the integrated circuit and the ambient temperature and generates a temperature reference signal. The driving electric circuit is electrically connected to the load measuring electric circuit and the temperature measuring electric circuit, and drives the fan with the load signal and the temperature reference signal to control the rotation speed of the fan.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 The present invention relates to a device for controlling heat dissipation of a fan of an integrated circuit, and more particularly, to a technique for controlling a rotation speed of a fan according to a magnitude of an operation load of a central processing unit and a difference between a surface temperature and an ambient temperature of the central processing unit.

[0002]

[Prior art]

 Due to the design of conventional motherboards, most of them measure the operating temperature of the central processing unit using temperature sensors, control the circuit to drive the fan, and keep the central processing unit at a constant temperature. However, due to the physical characteristics of the temperature sensor, chip surface fatigue occurred, and the central processing unit went down or malfunctioned due to thermal expansion and shrinkage of the motherboard and temperature changes. FIG. 1 shows a conventional integrated circuit fan heat radiation control device, in which an integrated circuit 11 is connected to a ballast 12, and the ballast 12 supplies necessary power to the integrated circuit 11. The input terminal of the ballast 12 is connected to one end of the sensitive resistor 15 and the input (−) terminal of the amplifier 13. The other end of the sensitive resistor 15 is connected to the input terminal (+) of the amplifier 13 and the power supply Vcc, and the output terminal of the amplifier 13 is connected to the fan 14. In the design of this electric circuit, the current of the sensitive resistor 15 can be changed depending on the burden of the integrated circuit 11. When the load on the integrated circuit 11 is large, the current flowing through the sensitive resistor 15 increases, and at the same time, the voltage of the sensitive resistor 15 decreases and is sent to the input terminal of the amplifier 13. At this time, the amplifier 13 controls the rotation speed of the fan 14 by amplifying the voltage drop. Alternatively, the fan 14 is moved or stopped according to the magnitude of the voltage drop. However, the conventional apparatus has the following disadvantages. 1. If the power is turned off and then turned on immediately when the temperature of the central processing unit is high, the fan is not turned on because the load on the central processing unit is not large. This kept the temperature of the central processing unit at a very high level and was prone to failure due to high temperatures. 2. Since the rotation speed of the fan 14 is controlled by the magnitude of the operation burden, the rotation speed of the fan cannot be changed when the ambient temperature is high or the temperature of the integrated circuit is very high.

[0003]

[Problems to be solved by the invention]

 The main purpose of the present invention is to improve the conventional integrated circuit fan heat radiation control device to protect the central processing unit from high temperature and prevent the central processing unit from going down or malfunctioning to improve the above drawbacks. To do.

[0004]

[Means for solving the invention]

 The fan speed of the integrated circuit is adjusted according to the load on the integrated circuit and the ambient temperature. The load measuring electric circuit is electrically connected to the integrated circuit and measures a load of the integrated circuit to generate a load signal. The temperature measurement electric circuit measures the difference between the surface temperature of the integrated circuit and the surrounding temperature and generates a temperature reference signal. The driving electric circuit is electrically connected to the load measuring electric circuit and the temperature measuring electric circuit, and drives the fan with the load signal and the temperature reference signal to control the rotation speed of the fan.

[0005]

[Embodiment of the invention]

 As shown in FIG. 2, the burden electric circuit is configured by combining an integrated circuit 21, a ballast 22, an amplifier 23, and a sensitive resistor 24. The integrated circuit 21 is connected to a ballast 22, which supplies power for operating the integrated circuit 21. The input terminal of the ballast 22 is connected to one end of the sensitive resistor 24, and then connected to the input (−) terminal of the amplifier 23. The other end of the sensitive resistor 24 is connected to the input (+) terminal of the amplifier 23 and the power supply Vcc. Also, the output terminal of the amplifier 23 is connected to a weighted summer (weighted summer) 28. When the load on the integrated circuit 21 increases, the load current flowing through the sensitive resistor 24 increases, and a voltage drop ΔV (ΔV = R: the size of the sensitive resistor × I: the burden current) is generated in the sensitive resistor. Send to 23. The amplifier 23 amplifies this voltage drop and sends a burden signal to the weighted summer 28.

A main part of the temperature measurement electric circuit is constituted by the substractor 25, the integrated circuit temperature measuring device 26 and the ambient temperature measuring device 27. The integrated circuit temperature measuring instrument 26 is connected to the input terminal of the subtractor 25, and the ambient temperature measuring instrument 27 is connected to the other input terminal of the subtractor 25. The output terminal of the subtractor 25 is connected to a weighted summer (weighted summer) 28, the integrated circuit temperature measuring device 26 and the ambient temperature measuring device 27 are connected to the temperature display 2B, and the integrated circuit temperature measuring device 26 is connected. At the same time, connect to buzzer 2C. The integrated circuit temperature measuring device 26 measures the temperature of the integrated circuit 21, and the ambient temperature measuring device 27 measures the air temperature around the integrated circuit 21. The two measured temperature signals are sent to the subtractor 25, the subtractor 25 subtracts and amplifies the two temperature signals, and sends the temperature measurement signal to a weighted summer 28. The temperature signals measured by the integrated circuit temperature measuring device 26 and the ambient temperature measuring device 27 are sent to the temperature display 2B to display the temperature of the integrated circuit 21 and the ambient temperature. The integrated circuit temperature measuring device 26 is further connected to the buzzer 2C and compares it with a certain voltage value. When the temperature of the integrated circuit 21 is too high, the buzzer 2C issues a warning signal with the buzzer. The driving electric circuit is constituted by the weighted summer (weighted summer) 28, the voltage regulator 29 and the fan 2A. The input terminal of the weighted summer (weighted summer) 28 is connected to the amplifier 23 of the burden electric circuit, and the other input terminal of the weighted summer (weighted summer) 28 is connected to the subtractor 25 of the temperature measurement electric circuit. Connecting. The output terminal of the weighted summer 28 is connected to the voltage adjusting resistor 2D and then connected to the voltage regulator 29. The output terminal of the voltage regulator 29 is connected to the fan 2A. The weighted summer (weighted summer) 28 adjusts the voltage of the load signal input from the amplifier 23 and the signal generated by the magnitude of the influence of the two signals of the temperature measurement signal input from the subtractor 25 on the integrated circuit. (Refer to U.S. Patent No. US005563480 for the voltage regulator 29). The voltage adjustment resistor 2D is a 54th part of the patent, and controls the output of the voltage regulator 29 by the voltage drop of the voltage adjustment resistor 2D, and controls the rotation speed of the fan 2A according to the magnitude of the voltage regulator 29 output. .

FIG. 3 shows another embodiment, in which the integrated circuit 21 is connected to one end of a sensitive resistor 24, the input end (−) of an amplifier 23, the ground and a capacitor 32, and the charging voltage of the capacitor 32 is changed. Provides a power supply for operating the central processing unit integrated circuit 21. The other end of the sensitive resistor 24 is connected to the replaceable power supply 31 and the replaceable power supply 31 is connected to the power supply VCC. The input terminal of the amplifier 23 is connected to the replaceable power supply 31, and the output terminal of the amplifier 23 is connected to a weighted summer 28. When the load on the integrated circuit 21 increases, the load current on the sensitive resistor 24 increases, and at the same time, a voltage drop ΔV occurs, and a voltage drop ΔV (ΔV = R: the size of the sensitive resistor × I: the load The current is input to the amplifier 23, and the amplifier 23 amplifies this voltage drop and sends a burden signal to the weighted summer 28. In addition, the temperature measurement electric circuit has exactly the same connection and operation device as the load electric circuit in FIG. Taking a computer as an example, in a situation where the central processing unit integrated circuit is turned off and then immediately turned on, the central processing unit temperature is very high. However, since the burden when starting to operate is small, the conventional technology does not know the high temperature condition of the central processing unit and does not rotate the fan at high speed. In such a situation, the central processing unit is very dangerous. The present invention puts the central processing unit in the safest condition according to the surface temperature and ambient temperature of the central processing unit other than the burden.

[0008]

[Effect of the invention]

 The present invention keeps the central processing unit at a more stable operating temperature by using a device that measures the temperature of the integrated circuit and its surroundings, in addition to the burden on the integrated circuit, and prevents computer downs and malfunctions due to high temperatures.

[Brief description of the drawings]

FIG. 1 is a chart of a conventional integrated circuit fan control device.

FIG. 2 is a chart diagram of the integrated circuit fan control device of the present invention.

FIG. 3 is a chart of an integrated circuit fan control device according to a second embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Integrated circuit 12 Ballast 13 Amplifier 14 Fan 15 Sensitivity 21 Integrated circuit 22 Stabilizer 23 Amplifier 24 Sensitivity 25 Substracter 26 Integrated circuit temperature measuring instrument 27 Ambient temperature measuring instrument 28 Weighted summer ( weighted summer) 29 Voltage regulator 2A Fan 2B Temperature indicator 2C Buzzer 2D Voltage regulation resistor 31 Replaceable power supply 32 Capacitor

Claims (19)

[Utility model registration claims] 1. A fan radiator for an integrated circuit, which adjusts a rotation speed of a fan of the integrated circuit according to a size of a burden on the integrated circuit and an ambient temperature. A load measurement electric circuit that measures a size and generates a load signal, a temperature measurement electric circuit that measures a difference between a surface of the integrated circuit and an ambient temperature and generates a temperature reference signal, and a load measurement electric circuit. A drive electric circuit electrically connected to the temperature measurement electric circuit, driving the fan with a burden signal and a temperature reference signal, and controlling a rotation speed of the fan. . 2. The load measuring electric circuit according to claim 1, wherein one end is connected to a ballast input terminal, the other end is electrically connected to a power supply, and the input terminal is electrically connected to the sensitive resistor. 2. The device according to claim 1, further comprising an amplifier electrically connected to the driving circuit. 3. The device according to claim 2, wherein the amplifier generates a burden signal when the voltage of the sensitive resistor drops. 4. The temperature measurement electric circuit, wherein the output terminal is electrically connected to the drive electric circuit, the input terminal is electrically connected to a temperature measuring instrument set, and the substructor is electrically connected to the substructor. 3. The integrated circuit fan radiator of claim 1, including the temperature measuring device set and a warning device that emits a signal. 5. The device according to claim 4, wherein said temperature measuring device set includes a plurality of said temperature measuring devices. 6. A fan radiator for an integrated circuit according to claim 5, wherein said plurality of temperature measuring devices include an integrated circuit temperature measuring device and an air temperature measuring device. 7. An output of said sub-tractor wherein said first input terminal of said sub-tractor and said output of said integrated circuit temperature measuring instrument are electrically connected, and said second input terminal of said sub-tractor and said air temperature measuring instrument are electrically connected. 7. The integrated circuit fan radiating device according to claim 6, wherein the driving electric circuit is electrically connected to the driving electric circuit. 8. The integrated circuit fan radiator according to claim 4, wherein said warning device is a temperature indicator for emitting a signal. 9. The integrated circuit fan radiator according to claim 8, wherein the signal is an optical signal. 10. The device according to claim 8, wherein the optical signal is a numerical value of the temperature of the integrated circuit. 11. The device according to claim 4, wherein the warning device is a buzzer that emits a signal. 12. The device according to claim 11, wherein the signal is an audio signal. 13. The drive electric circuit includes an adder electrically connected to the load measurement electric circuit and the temperature measurement electric circuit, one end of which is connected to the adder, and the other end of which is connected to the fan. 2. The integrated circuit fan radiator according to claim 1, further comprising: a voltage regulator connected in series. 14. The device of claim 13, wherein said adder is a weighted summer. 15. The device of claim 13, wherein said adder has a plurality of said input terminals. 16. The adder has an input terminal connected to an output of the load measuring electric circuit and an adder.
16. The device according to claim 15, wherein the other input terminal of r) is electrically connected to an output of the temperature measuring electric circuit. 17. The method as claimed in claim 17, wherein the voltage regulator is the adder.
14. The integrated circuit fan radiator according to claim 13, wherein the voltage is adjusted by connecting to the output. 18. The device according to claim 1, wherein said integrated circuit is a high-efficiency integrated circuit. 19. The device according to claim 18, wherein said high-efficiency integrated circuit is a central processing unit.