JPH09264647A - Electronic apparatus cooling circuit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cooling circuit which has a power detecting means arranged at an electronic apparatus, especially a power detecting means arranged at a power source or an input output part for an electronic load, and is provided with a circuit to estimate a heat generating amount due to a power difference therebetween and the increase of temperature responding to a part mounting format, and control an airflow of a cooling fan according to a power difference. SOLUTION: An electronic apparatus 1 is provided at an interior with an electronic circuit 2, and the input/output part thereof with voltage detectors 3a and 3b and current detectors 4a and 4b. Outputs therefrom are respectively inputted to power detectors 5a and 5b to calculate a power, and a difference content between calculated power values is inputted to a power voltage converter 7 through a comparator 6. The power voltage converter 7 inputs an output voltage, responding to an input power, to one of amplifiers 8. Meanwhile, a voltage reference circuit 9 set according to the increase of the internal temperature of the electronic apparatus 1 and a part mounting format inputs an output to the other of the amplifiers 8. The amplifier 8 compares input values from the two members with each other and amplifies the comparing result and drives a cooling fan drive circuit 10 according to an input and a cooling fan 11 cools the electronic apparatus 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to cooling of electronic equipment, and more particularly to a cooling circuit for reducing a temperature rise of a power supply or an electronic load.

[0002]

2. Description of the Related Art Conventionally, in a cooling circuit generally used for a power source or an electronic load of electronic equipment, a fan for cooling the maximum heat of the electronic circuit is forcibly driven.

In other cooling circuits, a temperature detector is used to control electronic devices by controlling them according to the temperature.

In other cooling circuits, power detection means is provided only at the output or the input to perform cooling.

Next, this conventional known example will be described with reference to the drawings.

As a known example of this prior art, Japanese Patent Laid-Open No. 5-1 is used.
Japanese Patent No. 45259 is known.

FIG. 5 is a block diagram showing the structure of an example of a conventional cooling device.

This conventional cooling device mainly comprises a circuit for generating a set temperature, a sensor capable of sensing the temperature, and a comparator for comparing the set temperature with the sensor output, for example, the temperature sensor 51 shown in FIG. Composed of.

Conventionally, in a cooling circuit generally used for electronic equipment, electronic loads, etc., a fan for cooling the maximum heat generation of the electronic circuit is forcibly driven, temperature is detected, and rotation of the fan is controlled. It was For example, in FIG. 5, the motor unit 53 forcibly drives the rotating unit 54 and the temperature sensor 5
1, the temperature is detected, and based on this, the rotation speed variable control unit 5
2 controls the rotation of the rotating unit 54.

[0010]

In the above-described conventional electronic equipment cooling circuit in which the fan is forcibly driven, when the electronic circuit becomes a large-scale system, the actual heat generation of the electronic circuit and the air-cooling fan There was a problem in that there was a difference in the capacity, waste of energy efficiency was inefficient, and the noise of the air-cooling fan increased.

In the conventional electronic equipment cooling circuit, in which the temperature detector is used to control the temperature according to the temperature, the control circuit does not operate until the internal temperature that has generated heat reaches the temperature setting of the detector. The heat generation time and the detection time are deviated, and the error of the temperature detector is overlapped, resulting in the same inefficient energy saving as described above, and the satisfactory effect cannot be obtained.

Further, in the conventional electronic equipment cooling circuit, in which the power detection means is provided only at the output or the input, and the same effect is expected, the input / output power difference is Since the heat generation that determines the power consumption of the calculated power supply and electronic load cannot be detected in detail,
The cooling became uncontrollable, and the same problem as above occurred.

[0013]

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems, to save energy and to reduce fan noise.

Therefore, (1) the electronic equipment cooling circuit according to the present invention includes a power detection means for detecting an input and an output of the electronic equipment and heat generation due to a power difference between the input and the output detected by the power detection means. There is provided a control circuit that estimates the temperature rise according to the amount and component mounting form and controls the air volume of the cooling fan according to the power difference. (2) The electronic device cooling circuit of the present invention includes an internal electronic circuit of an electronic device, a voltage detector for detecting an input / output voltage in each input / output section of the internal electronic circuit, and a current detector for detecting an input / output current. Power supply, which calculates the power by inputting the output of the voltage detector and the current detector, and the power comparison that compares the respective power values of the input and output parts of the internal electronic circuit calculated by this power detector And a power voltage converter that inputs the difference compared by this power comparator and outputs a voltage according to the input power, and was set in consideration of the air flow of the fan depending on the internal temperature rise of electronic equipment and the component mounting form. The voltage reference circuit that outputs the reference voltage, the cooling fan that cools the electronic equipment, and the output from the power voltage converter are input to one side, and the output from the voltage reference circuit is input to the other side, and the values of these inputs are compared. Amplify and cool And a cooling fan drive circuit for driving the fan. (3) The electronic device cooling circuit of the present invention has the cooling fan of the above (2) and the monitor circuit for monitoring the output value of the cooling fan drive circuit. (4) The electronic device cooling circuit of the present invention has the above (2) or (3).
By using a plurality of output side detectors of the electric power detector according to the type of output load, the cooling operation of the electronic device is finely controlled. (5) The electronic device cooling circuit of the present invention has the above (3) or (4).
The output of the monitor circuit is used as a signal of the system control circuit for controlling the large-scale electronic device cooling circuit, and the cooling operation is performed by controlling each part of the large-scale electronic device cooling circuit from the outside.

[0015]

Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram showing the configuration of an embodiment of an electronic equipment cooling circuit of the present invention.

FIG. 1 shows a cooling circuit of an electronic device 1. An electronic circuit 2 is provided inside the electronic device 1 (power source or electronic load), and an input / output section of the electronic circuit 2 has a voltage. It has detectors 3a and 3b and current detectors 4a and 4b. Voltage detectors 3a and 3b and current detector 4
The outputs of a and 4b are input to power detectors 5a and 5b to calculate power. Then, the difference between the input and output power values of the electronic circuit 2 calculated by the power detectors 5 a and 5 b is input to the power-voltage converter 7 via the power comparator 6. The power-voltage converter 7 outputs a voltage according to the input power to itself, and inputs it into one (+ side) of the amplifier 8. On the other hand, the voltage reference circuit 9 in consideration of the internal temperature rise of the electronic device 1 and the air volume of the fan due to the component mounting form is the other of the amplifier 8 (-
Side), the amplifier 8 compares and amplifies the output value of the power-voltage converter 7, and outputs the cooling fan drive circuit 10 according to the input.
Input signal. The cooling fan 11 has its own electronic circuit 2
Become a cooling fan.

Next, the operation of the electronic device cooling circuit of this embodiment will be described with reference to the drawings.

FIG. 2 is a flow chart for explaining the operation of the electronic device cooling circuit of FIG.

When a current flows through the internal electronic circuit 2 (step 21), the voltage detectors 3a and 3b and the current detector 4 are detected.
Voltage / current detection of the electronic circuit input / output unit is carried out at a and 4b (step 22). The detected output is the power detector 5
A and 5b are converted into power values (step 23), and the power comparator 6 compares the input and output powers to calculate the power difference (step 24). Next, the power-voltage converter 7 converts the power into a voltage (step 25), and the amplifier 8 compares the amplified converted voltage with the reference value set in the voltage reference circuit 9 (step 27). As a result, when the converted voltage is higher than the reference voltage (step 27, Yes), the cooling fan drive circuit 10 is operated to rotate the cooling fan 11 (step 28). If the converted voltage is smaller than the reference voltage (step 27, No), the cooling fan drive circuit 10 stops the rotation of the cooling fan 11 (step 29).

By the way, the difference between the input power and the output power of the electronic device 1 becomes the power consumption of the internal electronic circuit 2. Since this power consumption is converted into heat energy by the electronic circuit 2,
The temperature rise is instantly calculated from the calorific value.

Further, even if the input voltage and the input current of the electronic device 1 change, the input power is detected by the product of the two and the cooling circuit operates, so that the electronic device 1 performs accurate control in correspondence with the wide input range. .

Next, another embodiment of the electronic device cooling circuit of the present invention will be described with reference to the drawings.

FIG. 3 is a block diagram showing the configuration of another embodiment of the electronic device cooling circuit of the present invention.

If a plurality of power detectors 5b and 5c are used according to the type of output load, as shown in FIG. 3, fine control becomes possible. FIG. 3 shows a case where a plurality of power detectors 5b and 5c are used on the output side, and the operation is similar to that of FIG.

Next, a case where this embodiment is used in a large-scale electronic equipment cooling circuit will be described with reference to the drawings.

FIG. 4 is a block diagram showing an example of the configuration of this embodiment used in a large-scale electronic equipment cooling circuit.

The monitor circuit 12 shown in FIGS. 1 and 3 monitors the output values of the cooling fan 11 and the cooling fan drive circuit 10. When the electronic device 1 has a plurality of or large scales, the output of the monitor circuit 12 is large. Is used for the signal of the system control circuit that controls the thermal management of the entire system. This Figure 4
The case where the electronic device 1 is used as a signal of the system control circuit 41 that controls the temperature management of the entire system when there are a plurality of times is shown.

[0029]

As described above, in the electronic equipment cooling circuit of the present invention, the electric power detection means is provided at the input / output of the electronic equipment, especially the power supply or the electronic load, and the electric power corresponding to the actual heat generation amount of the power supply or the electronic load is provided. Is detected and the air volume of the cooling fan is controlled according to the power difference, a temperature detector is not required, and the temperature inside the electronic circuit can be reliably managed.
Effective in saving energy and reducing fan noise.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of an embodiment of an electronic device cooling circuit of the present invention.

FIG. 2 is a flowchart for explaining the operation of the electronic device cooling circuit of FIG.

FIG. 3 is a block diagram showing a configuration of another embodiment of an electronic device cooling circuit of the present invention.

FIG. 4 is a block diagram showing a configuration of an example when the present embodiment is used in a large-scale electronic device cooling circuit.

FIG. 5 is a block diagram showing a configuration of an example of a conventional cooling device.

[Explanation of symbols]

 1 Electronic Equipment 2 Electronic Circuits 3a, 3b Voltage Detector 4a, 4b Current Detector 5a, 5b, 5c Power Detector 6 Power Comparator 7 Power Voltage Converter 8 Amplifier 9 Voltage Reference Circuit 10 Cooling Fan Drive Circuit 11 Cooling Fan 12 Monitor circuit 41 System control circuit

Claims (5)

[Claims] 1. A power detection means for detecting an input and an output of an electronic device, and a heat generation amount due to a power difference between the input and the output detected by the power detection means and a temperature rise according to a component mounting form are estimated. And a control circuit for controlling the air volume of the cooling fan according to the power difference. 2. An internal electronic circuit of an electronic device, a voltage detector for detecting an input / output voltage and an electric current detector for detecting an input / output current, which are provided in an input / output section of the internal electronic circuit, respectively, and the voltage detection. Detector and a power detector that inputs the output of the current detector to calculate power, and a power comparator that compares the respective power values of the input and output parts of the internal electronic circuit calculated by the power detector, A power-voltage converter that inputs the difference compared by this power comparator and outputs a voltage according to the input power, and a reference voltage that is set considering the air volume of the fan due to the internal temperature rise of the electronic device and the component mounting form. , A cooling fan for cooling the electronic device, an output from the power-voltage converter is input to one side, an output from the voltage reference circuit is input to the other side, and the values of both inputs are input. ratio An electronic device cooling circuit, comprising: a cooling fan driving circuit which drives the cooling fan after performing comparative amplification. 3. The electronic device cooling circuit according to claim 2, further comprising a monitor circuit that monitors output values of the cooling fan and the cooling fan drive circuit. 4. The cooling operation of the electronic device is finely controlled by using a plurality of output side detectors of the power detector according to the type of output load. Electronic device cooling circuit described. 5. The output of the monitor circuit is used as a signal of a system control circuit for controlling a large-scale electronic device cooling circuit,
The electronic device cooling circuit according to claim 3 or 4, wherein the cooling operation is performed by controlling the cooling circuit of each part of the large-scale electronic device cooling circuit from the outside.