JPH0814450B2 - Immersion DC-DC converter cooling structure - Google Patents

Description

TECHNICAL FIELD The present invention relates to a cooling structure of an immersion DC-DC converter in which a DC-DC converter used in an electronic computer is cooled by being immersed in a refrigerant liquid.

[Prior Art] Conventionally, as a cooling method of a DC-DC converter, it has been general that forced cooling is performed by a fan provided below the power supply. However, as the density of logic boards has increased in recent years,
Due to the increase in power consumption, a power supply with a large capacity and a small size has been required. However, forced air cooling requires a liquid cooling method instead of forced air cooling because a heat sink becomes large and the size cannot be reduced, and noise regulation cannot be satisfied when the air volume is increased, and therefore a soundproof structure must be provided.

Conventionally, in this type of cooling structure, as shown in FIG. 3, for example, a circuit board 1 of a DC-DC converter is housed in a metal or plastic hermetically sealed container 2 and a connector 3 is provided at the bottom of the hermetically sealed container 2. And the refrigerant liquid 4 is connected to the sealed container 2
The heat exchanger 5 is placed in the space above the sealed container 2.
Is provided as a condenser for the refrigerant liquid 4, and there is a structure in which water or another refrigerant is cooled through the heat exchanger 5. As the coolant liquid 4, various fluorocarbons which are non-corrosive and non-dissociative solutions are used.

In addition, one is, as shown in FIG. 4, a secondary rectifying diode 6 or the like as a heat generating electronic component of the DC-DC converter,
There is a structure in which a metal cold plate 7 having a flow passage for flowing a coolant such as water therein is fixed to conduct direct conduction cooling, while other heat-generating components 9 are forcedly cooled by a fan.

[Problems to be Solved by the Invention] However, in the cooling structure of the immersion DC-DC converter shown in the former case described above, the total calorific value of all the heat-generating components is very large, and therefore the refrigerant to be immersed is used. The heat exchanger 5 serving as the condenser becomes large in size, and there is a drawback that miniaturization cannot be expected.

Also, the cold plate 7 shown in the latter of the related art was used.
In the cooling structure of the DC-DC converter, there are many types of heat-generating components and various shapes. Among them, there are some that cannot be fixed to the cold plate 7 and conduction-cooled. Since the heat-generating component cannot be cooled by the cold plate, the component that cannot be cooled must be forcibly air-cooled by the fan, so that the cooling is insufficient.

[Means for Solving the Problems] A technical means of the present invention for solving such a problem is a multi-converter including a collective rectification unit, a DC-DC converter, and a power supply control circuit unit of an electronic computer. In a cooling structure for immersing and cooling the DC-DC converter in a power supply system, a DC-DC converter is provided with a hermetically sealed container containing the refrigerant liquid to be immersion-cooled, and a cooling liquid provided in an upper portion of the hermetically sealed container to cool the refrigerant liquid. Immersion DC-DC provided with a heat exchanger and a cold plate having a metal flow passage having excellent heat conductivity showing the refrigerant of the heat exchanger to which the high heat generating electronic components of the DC-DC converter are attached It is in the cooling structure of the converter.

[Embodiment] An immersion according to an embodiment of the present invention will be described below with reference to the accompanying drawings.
The cooling structure of the DC-DC converter will be described.

The cooling structure according to this embodiment cools the DC-DC converter in a multi-converter power supply system including a batch rectification unit of a computer, a DC-DC converter, and a power supply control circuit unit.

As shown in FIGS. 1 and 2, the DC-DC converter is a circuit board 1 to which electronic components such as a transformer 10 are attached. In the embodiment, this DC-DC converter is housed in a metal or plastic hermetic container 2 and connected to a connector 3 of the hermetic container 2. The cooling liquid 4 is contained in the hermetic container 2 and the DC-DC converter is immersed therein. As the refrigerant liquid 4, various fluorocarbons which are non-corrosive and non-dissociative solutions are used. Further, a heat exchanger 5 as a condenser for cooling the refrigerant liquid 4 is provided above the sealed container 2. The heat exchanger 5 is formed in a pipe shape, and is configured to allow water or other refrigerant to pass therethrough. Further, the heat exchanger 5 is provided with a U-shaped metal flow path 8 that is bent downward and is formed in a U-shape, and has a U-shape. The cold plate 7 is provided in the flow path 8
Is located inside and attached by a method such as brazing. On this cold plate 7, the high heat-generating component 9 mounted on the secondary rectifying diode 6 and the circuit board 1 is screwed 11
And so on.

Therefore, according to the cooling structure of the immersion DC-DC converter according to this embodiment, in the sealed container 2, the circuit board 1
Etc. are immersed in the refrigerant liquid 4 to input and output signals and input / output currents via the connector 3. In this case, a heat exchanger 5 is installed above the sealed container 2 to condense the refrigerant liquid 4 and absorb heat generated by the entire DC-DC converter such as the transformer 10. On the other hand, a cold plate 7 having a flow path 8 of the heat exchanger 5 is connected to the heat exchanger 5 by a method such as brazing, and by the cold plate 7, the secondary rectifier diode 6 and the circuit board 1 are connected. The mounted high heat-generating component 9 is partially conductively cooled by a coolant such as water flowing inside the heat exchanger 5 flowing into the flow path 8 of the cold plate 7.

Therefore, not only the entire DC-DC converter but also a part thereof is cooled, so that the cooling efficiency is good.

[Advantages of the Invention] As described above, in the cooling structure of the immersion DC-DC converter of the present invention, the heat exchanger for cooling the refrigerant liquid in the upper part of the sealed container for immersion cooling of the DC-DC converter has a high heat generating electron. Since a cold plate with a flow path for the refrigerant is connected to the inside of the metal with excellent thermal conductivity where the parts are attached, it is possible to cool the high heat generating parts not only with the refrigerant liquid but also with the cold plate. In addition to improving efficiency, the heat exchanger can be downsized by the amount of cooling by the cold plate. Further, since the other heat-generating components are also cooled by the heat exchanger immersed in the refrigerant liquid, there is no need for forced air cooling by a fan, and the cooling efficiency is improved accordingly.

[Brief description of drawings]

FIG. 1 is a side sectional view showing a cooling structure of an immersion DC-DC converter according to an embodiment of the present invention, FIG. 2 is a front sectional view of FIG. 1, and FIG. 3 is cooling of a conventional DC-DC converter. FIG. 4 is a front sectional view showing an example of the structure, and FIG. 4 is a schematic front view showing another example of the cooling structure of the conventional DC-DC converter. 1: Circuit board, 2: Sealed container 3: Connector, 4: Refrigerant liquid 5: Heat exchanger, 6: Secondary rectifier diode 7: Cold plate 8: Flow path, 9: Heating component 10: Transformer, 11: Screw

Claims (1)

[Claims] 1. A DC-DC in a cooling structure for dipping and cooling the DC-DC converter in a multi-converter power supply system in a multi-converter power supply system including a batch rectification unit of an electronic computer, a DC-DC converter and a power supply control circuit unit. A sealed container containing a refrigerant liquid in which the converter is immersion-cooled, a heat exchanger provided in the upper part of the sealed container for cooling the refrigerant liquid, and a high heat-generating electronic component of a DC-DC converter are attached to the heat exchanger. Immersion DC-characterized by having a cold plate having a metal flow path excellent in heat conductivity for flowing a refrigerant therein
DC converter cooling structure.