JP2778655B2 - Cooling system - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cooling device, and more particularly, to a cooling device for cooling heat generated from an electronic circuit device, which prevents malfunction due to dew condensation at the time of starting the electronic circuit device. The present invention relates to a cooling device.

[Conventional technology]

In an installation environment of an electronic circuit device, dew condensation may occur before the electronic circuit device is started. In this case, when power is supplied to an electronic circuit device in a dew state, the circuit may be short-circuited and malfunction may occur depending on the dew state.

On the other hand, when starting the electronic circuit, for example, as described in JP-A-59-119426, a dew condensation detecting unit is provided in the vicinity of the electronic circuit to directly detect the dew state. Accordingly, a method of starting an electronic circuit that protects the electronic circuit by not turning on the power of the electronic circuit for a certain period of time when the installation environment of the electronic circuit is in a dew state has been proposed.

[Problems to be solved by the invention]

By the way, the above-described method of starting an electronic circuit according to the related art detects a case where the installation environment of the electronic circuit is in a dew state by providing a dew detection unit for directly detecting a dew state in the vicinity of the electronic circuit. Then, for a certain period of time until the dew condensation state due to energization of the power supply device of the electronic circuit is eliminated,
By turning off the power to the electronic circuit, the electronic circuit is protected.

However, in such a method of starting an electronic circuit,
There is a problem in that the prediction of the dew condensation state is not taken into consideration, and the protection operation of the electronic circuit is started after the dew condensation state occurs.

In addition, the dew condensation detecting section must be provided in the vicinity of the electronic circuit, and if the heat capacity of the electronic component, which actually causes inconvenience due to dew condensation, greatly differs from the heat capacity of the dew detecting section, Before detecting the dew condensation state, the electronic components become dew condensation state, and when the power of the electronic circuit is turned on in this state, there is a problem that a failure such as a short circuit occurs.

The present invention has been made to solve these problems.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a cooling device for cooling heat generated from an electronic circuit device, which prevents a malfunction due to dew condensation at the time of starting the electronic circuit device.

[Means for solving the problem]

In order to achieve the above object, the cooling device of the present invention includes a heat absorber through which a liquid passes, a liquid circulation pump, a liquid-air heat exchanger, and a liquid pipe connecting between them. A cooling device for cooling the heat generated from the electronic circuit device by bringing the heat absorber into contact with a heating element of the electronic circuit device; a first temperature sensor for monitoring an environmental temperature of the electronic circuit device; The second temperature sensor to be monitored is compared with the outputs from the first temperature sensor and the second temperature sensor. If the liquid temperature is lower than the ambient temperature when the electronic circuit device is started, the liquid circulation pump and the liquid air A control device for operating the heat exchanger and transmitting a signal permitting power supply to the electronic circuit device when the liquid temperature exceeds the ambient temperature.

[Action]

According to this, in the cooling device, the first temperature sensor, the second temperature sensor, and the control device are provided.

The cooling device is composed of a heat absorber through which the liquid passes, a liquid circulation pump, a liquid-air heat exchanger, and a liquid pipe connecting between the heat absorber and the heat absorber of the electronic circuit device. The heat generated from the electronic circuit device is cooled by contact with the body.

The first temperature sensor monitors a circulation temperature of the electronic circuit device cooled by the cooling device. The second temperature sensor monitors the temperature of the liquid circulating in the liquid pipe of the cooling device. Then, the control device controls the first temperature sensor and the second temperature sensor.
Comparing the outputs from the temperature sensors, when the liquid temperature is lower than the ambient temperature when the electronic circuit device is started, the liquid circulation pump and the liquid air heat exchanger are operated, and when the liquid temperature exceeds the ambient temperature, A signal for permitting power supply to the electronic circuit device is transmitted.

That is, a cooling device that has a liquid circulation pump, a liquid air heat exchanger, a heat absorber, and a connection pipe and cools an electronic circuit device has a temperature of a liquid of a cooling medium lower than an ambient temperature during a normal operation. In this case, the cooling operation is not performed, but when the electronic circuit device is started, the liquid temperature is compared with the environmental temperature of the electronic device, and when the liquid temperature is lower than the environmental temperature, the liquid circulation pump and the liquid air heat exchanger are used. To work.

As a result, heat exchange reverse to normal cooling is performed,
The heat absorber that operates so that the temperature of the liquid circulating in the liquid pipe of the cooling device rises to the ambient temperature, and when the liquid temperature is lower than the ambient temperature, the heat absorber that is in contact with the heating element of the electronic circuit device Prevents the occurrence of dew condensation due to the supercooled state of the position of the. Further, it is possible to prevent the occurrence of dew condensation in the electronic circuit device.

〔Example〕

Hereinafter, an embodiment of the present invention will be specifically described with reference to the drawings.

FIG. 1 is a block diagram showing the overall configuration of a cooling device according to one embodiment of the present invention.

The cooling device is a cooling unit (a so-called liquid cooling heat conduction module) disposed in contact with a heating element of the printed circuit board 1 of the electronic circuit device, that is, a heat absorber 2 through which liquid of a cooling medium passes. , A liquid circulation pump 3, a heat exchanger body 4 and a blower 5 of a liquid-air heat exchanger, and a liquid pipe 6 connecting them.

The cooling device cools the heat generated when the electronic circuit device operates by bringing the heat absorber 2 into contact with a liquid-cooling heat conducting module of the electronic circuit provided on the printed circuit board 1 of the electronic circuit device. An operation of circulating the liquid of the medium and removing it from the heat absorber 2 is performed. The liquid circulating cooling system of the cooling device includes a heat absorber 2 having a liquid cooling heat conduction module mounted on a printed circuit board 1, a liquid air heat exchanger 4, a liquid circulation pump 3, and a liquid circulation system of the heat absorber 2. They are connected by a pipe 6. The cooling device includes a first temperature monitoring unit 7 for monitoring an environmental temperature, a second temperature monitoring unit 8 for monitoring a liquid temperature of a liquid circulation cooling system, and an output of the first temperature monitoring unit 7 and a second temperature. By comparing with the output of the monitoring unit 8,
A microprocessor 9 for outputting a control signal and a cooling control unit 10 for controlling the liquid circulation pump 3 and the blower 5 are provided. The electronic circuit device cooled by the cooling device includes an electronic circuit of the printed circuit board 1, a stabilized DC power supply 11 for supplying a voltage to the electronic circuit, and a power supply line unit connecting the printed circuit board 1 and the stabilized DC power supply 11. It consists of 12 and.

The microprocessor 9 receives the output of the first temperature monitoring unit 7 on the temperature monitoring signal line 14 and receives the output of the second temperature monitoring unit 8 on the temperature monitoring signal line 14, performs a comparison operation, and performs a cooling operation.
A control signal to the cooling control line 15 is transmitted to the cooling control line 15, and a control signal to the stabilized DC power supply 11 is transmitted from the power supply control line 18. The cooling controller 10 receives a control signal from the microprocessor 9 and sends out signals for controlling the liquid circulation pump 3 and the blower 5 of the liquid-air heat exchanger via control lines 15 and 16.

When the electronic circuit device starts up, the microprocessor 9
The first temperature monitor 7 and the second temperature monitor 8 monitor the environmental temperature and the liquid temperature of the electronic device, respectively, and compare the two temperatures. At this time, when the output value of the second temperature monitoring unit 8 is smaller than the output value of the second temperature monitoring unit 7, that is, when the liquid temperature is lower than the environmental temperature, condensation in the electronic circuit device may occur. Therefore, the microprocessor 9 sends a control signal for inhibiting power supply to the electronic circuit device (printed circuit board 1) to the DC stabilized power supply 11 via the power supply control line 18. Further, a signal for operating the liquid circulation pump 3 and the blower 5 is transmitted to the cooling control line 15 for the cooling control unit 10. Thereby, the cooling control unit 10
Operates the liquid circulation pump 3 and the blower 5.

For this reason, the temperature of the liquid increases due to heat generated by the motor of the pump itself and heat from the shaft and the like. In addition, the blower 5 supplies the air at the ambient temperature to the liquid-air heat exchanger 4, so that heat is transferred in a direction opposite to the normal cooling state. That is, heat exchange is performed by raising the low liquid temperature with air at a high ambient temperature. The control signal is sent to the cooling control unit to perform the operation until the temperature of the liquid heated by these synergistic effects reaches the same temperature as the ambient temperature or exceeds the ambient temperature.

This is because the microprocessor 9 monitors the first temperature monitoring unit 7 and the second temperature monitoring unit 8 at regular time intervals by a built-in timer to perform operation, and the liquid temperature becomes equal to the ambient temperature. Or when the temperature exceeds the ambient temperature, it is determined that there is no risk of dew condensation in the electronic circuit device, and the microprocessor 9 instructs the cooling control unit 10 to operate the liquid circulation pump 3 and the blower 5. Is transmitted. At this time, a control signal for permitting power supply to the electronic circuit device is sent to the stabilized DC power supply 11 via the power control line 18. As a result, the electronic circuit device is turned on and shifts to a normal start-up in a state where inconvenience due to dew condensation is prevented.

As described above, according to the present embodiment, it is possible to perform protection by predicting that the installation environment in the electronic circuit device will be in a dew condensation state without having a dew condensation detection unit that directly detects the dew condensation state.

As mentioned above, although the present invention was explained concretely based on an example, the present invention is not limited to the above-mentioned example.
It goes without saying that various changes can be made without departing from the scope of the invention.

〔The invention's effect〕

As described above, according to the present invention, in the cooling device for cooling the electronic circuit device, the temperature of the liquid of the cooling medium is monitored, the environmental temperature of the electronic circuit device is monitored, and the liquid is cooled when the electronic device is started. If the temperature is lower than the ambient temperature,
The cooling device is operated to raise the liquid temperature to the ambient temperature, thereby preventing inconvenience due to dew condensation in the electronic circuit device.
At this time, while the liquid temperature is lower than the environmental temperature, by performing control not to permit power supply to the electronic circuit device, it is possible to prevent inconvenience due to dew condensation in the electronic circuit device.

[Brief description of the drawings]

FIG. 1 is a block diagram showing the overall configuration of a cooling device according to one embodiment of the present invention. In the drawing, 1 ... printed circuit board, 2 ... heat absorber, 3 ... liquid circulation pump, 4 ... liquid air heat exchanger, 5 ... blower, 6 ... pipe, 7 ... first temperature monitoring , 8... Second temperature monitoring unit, 9... Microprocessor, 10... Cooling control unit, 11... DC stabilized power supply, 12.
13 ... temperature monitoring line, 14 ... temperature monitoring line, 15 ... cooling control line, 16, 17 ... control line, 18 ... power supply control line.

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-2-127716 (JP, A) JP-A-63-211799 (JP, A) (58) Fields investigated (Int. Cl. ⁶ , DB name) H05K 7/20 G06F 1/00 F25D 21/04

Claims (1)

(57) [Claims] A liquid circulation pump, a liquid-air heat exchanger, and a liquid pipe connecting the liquid absorber and a liquid pipe, and the heat absorber is connected to an electronic circuit device. A first temperature sensor for monitoring an environmental temperature of the electronic circuit device, a second temperature sensor for monitoring a temperature of the liquid, and a second temperature sensor for monitoring a temperature of the liquid. The outputs from the first temperature sensor and the second temperature sensor are compared, and when the liquid temperature is lower than the ambient temperature when the electronic circuit device is started, the liquid circulation pump and the liquid air heat exchanger are operated, and the liquid temperature is reduced. A cooling device for transmitting a signal for permitting power supply to the electronic circuit device when the temperature exceeds the ambient temperature.