JPS60137047A - Temperature rising preventing device - Google Patents

Abstract

PURPOSE:To operate a cooling fan under necessary conditions at necessary time by controlling the rotating speed of the fan by a signal from temperature detecting means. CONSTITUTION:Since a temperature detector 3 needs cooling, it is provided at a suitable place in an electronic device having a fan 5. A power source voltage controller 4 receives a signal from the detector 3, controls the operation of the fan 5, and suitably converts the voltage of a power source 2 in response to the signal from the detector 3 and supplies it to the fan 5. As a result, a noise due to air cutting sound generated by the rotation of the fan can be reduced, and power consumption can be also reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a temperature prevention device, and more particularly to a temperature rise prevention device for electronic devices, etc., which has a cooling fan for suppressing a rise in internal temperature.

In recent years, information processing equipment and other electronic devices such as personal computers, office computers, and word processors have become increasingly smaller and more sophisticated, and with this, electronic circuits such as ICs and other electronic devices have become increasingly smaller and more sophisticated. The temperature inside the device increases significantly due to heat generated from the power supply, etc., which increases the occurrence of various problems such as malfunction of the device and decrease in the lifespan and reliability of the device.I)? \be. To solve this problem, a widely used method is to install a cooling fan (electric fan) in devices where temperature rise is a concern, and to keep this fan running at all times to cool the inside of the device. There is.

Conventionally, the cooling fans mentioned above have been unable to operate under conditions that suppress the temperature rise within the device to a specified range even under the worst environmental conditions in which the device is used. Therefore, in devices used in general offices, such as the above-mentioned personal computers and word processors, the wind noise produced by the operation of the fan harms the office working environment as noise. Things are happening all the time.

On the other hand, many of the offices where the above-mentioned equipment is installed are fully equipped with indoor air conditioning, so it is not necessarily necessary to operate the fans under the operating conditions set by the worst-case environmental conditions as mentioned above. It is often sufficient to operate under operating conditions that match the environmental conditions at the specified location.

Therefore, an object of the present invention is to enable the fan to operate when necessary under the necessary conditions in the above-mentioned cases, to prevent noise caused by the wind noise of the fan, and to save energy. An object of the present invention is to provide a temperature rise prevention device for electronic devices, etc. that can be used in electronic devices.

The temperature rise prevention device of the present invention includes a temperature detecting means provided inside an electronic device or the like equipped with a cooling fan for preventing an increase in internal temperature, and a temperature detecting means provided inside an electronic device equipped with a cooling fan for preventing an increase in internal temperature. and a power supply voltage control means for controlling the rotation speed of the motor.

Next, the present invention will be explained in detail with reference to the drawings.

p) Figure 11 is a block diagram showing an embodiment of the present invention, in which the temperature detector 3 requires cooling, so it is installed at an appropriate location inside an electronic device or the like equipped with a fan 5. The power supply voltage control circuit 4 is a circuit that receives a signal from the temperature detector 3 and controls the operation of the fan 5, and converts the voltage of the power supply 2 appropriately in accordance with the signal from the temperature detector 3 to control the operation of the fan 5. The line will be connected to 5.

FIG. 2 is a circuit diagram showing an example of the embodiment shown in FIG. 1. In this example, four thermostats S, ~S4 are used as temperature detectors. Thermostats S and ~S4 have different temperatures (for example, Sl is 20
℃ or higher, S2 is 25℃ or higher, S3 is 30℃ or higher% 8
The thermostats 81 to S4 are connected to resistors R1 to R4 of appropriate values, and these resistors R, to R4 are connected in parallel. The fan motor M1 is connected to the fan motor M1. Therefore, the AC type temperature input from terminal AC is thermostat 8.
Resistor R1 according to the temperature inside the device where 1 to S4 are installed.
Since the voltage is reduced by R4 and supplied to the fan motor M1, the rotational speed of the fan motor M1 changes in a stepwise manner as shown in FIG. 3, so that optimal cooling can be performed.

FIG. 4 shows the thermistor SM as the temperature detector in FIG. 1 and the transistor Il+ as the voltage supply control circuit.
FIG. 3 is a circuit diagram showing an example of the case where Thermistor SM
and a transistor T are connected as shown in FIG. 4, the collector of the transistor Tr is connected to the fan motor M2, and a DC voltage of 1'vt is supplied to the thermistor 8M as shown in FIG. Since the resistance value changes depending on the temperature in the device in which it is installed, the fan motor M2
The rotational speed of the fan motor also changes as shown in the figure, so that the wind noise of the fan motor can be reduced, noise can be reduced, and efficient cooling can be performed in accordance with the internal temperature of the device.

As explained in detail above, (1) by attaching the temperature rise prevention device of the present invention to an appropriate location inside an electronic device equipped with a cooling fan, it is possible to achieve optimal rotation according to the temperature inside the device. Since the rotational operation of the fan motor can be controlled to match the number of rotations of the fan, it is possible to reduce the noise caused by wind noise caused by the rotation of the fan, and it is also possible to reduce power consumption, resulting in energy savings. There is an effect.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention, FIG. 2 is a circuit diagram showing an example of the temperature detector and power supply voltage control circuit in FIG. 1, and FIG. 3 is a circuit diagram showing an example of the temperature detector in FIG. A graph showing detected temperature and fan motor rotation speed, Figure 4 is a circuit diagram showing another example of the temperature detector and electric current specific pressure control circuit in Figure 1, and Figure 5 is a graph showing Figure 4. It is a J graph showing the relationship between the characteristics of the thermistor, the detected temperature, and the rotation speed of the fan motor. In the figure, 2... power supply, 3... temperature detector, 4...
...Power supply voltage control circuit, ...Fan, S
1-S4...Thermostat, R1-R4...
...Resistance, Ml...Fan motor, R,
,,R,2...Resistor, S~l...Thermistor, Fig. 3, Fig. 4, (A), Fig. 5

Claims (1)

[Claims] Temperature detection means provided inside an electronic device etc. equipped with a cooling fan for preventing an increase in internal temperature, and power supply voltage control for controlling the rotation speed of the fan according to a signal from the temperature detection means. A temperature rise prevention device characterized by having means.