JP7103267B2 - Cooler - Google Patents

Description

The technique disclosed herein relates to a cooler in which a plurality of cooling pipes are arranged in a row and a heating element is sandwiched between adjacent cooling pipes.

Patent Document 1 discloses a power conversion device including a cooler in which a plurality of cooling pipes are arranged in a row and a semiconductor module (heating body) is sandwiched between adjacent cooling pipes. In this power conversion device, a temperature sensor for detecting the temperature of the refrigerant flowing in the cooling pipe is attached to the cooling pipe.

Japanese Unexamined Patent Publication No. 2008-220042

The refrigerant flowing through the cooling pipe may leak to the outside for some reason from other than the refrigerant inlet and outlet of the cooler. If the refrigerant leaks to the outside, the flow rate of the refrigerant flowing in the cooling pipe will decrease. Therefore, the temperature sensor attached to the cooling pipe may not be able to accurately detect the temperature of the refrigerant, or may not be able to detect an abnormality such as a leakage of the refrigerant.

For example, when the cooling pipes are arranged in a non-horizontal direction and the cooler is mounted on a vehicle or the like so as to be tilted, the refrigerant is contained in the cooling pipes located on the high and low sides caused by the tilting. It becomes difficult to flow. Therefore, when the temperature sensor is attached to such a high-level cooling pipe, it becomes difficult to accurately measure the temperature of the refrigerant. The present specification provides a technique capable of detecting an abnormality in a cooler in which a plurality of cooling pipes are arranged side by side and adjacent cooling pipes are connected by a connecting pipe.

The cooling system disclosed herein includes a plurality of cooling pipes arranged in a row, a pair of connecting pipes, a pair of refrigerant supply / discharge ports, a first temperature sensor, a second temperature sensor, and a controller. ing. A plurality of sets of a pair of connecting pipes are provided. The pair of connecting pipes are located on both sides of the heating element when viewed from the arrangement direction of the plurality of cooling pipes, and connect the adjacent cooling pipes to each other. Hereinafter, the arrangement direction of the plurality of cooling pipes is simply referred to as the arrangement direction. The pair of refrigerant supply / discharge ports are provided in the cooling pipes at one end in the arrangement direction, and are located so as to overlap each connecting pipe when viewed from the arrangement direction. The first temperature sensor is attached to a cooling pipe at one end in the alignment direction. The second temperature sensor is attached to the cooling pipe at the other end in the alignment direction. The controller sends a signal indicating an abnormality when the absolute value of the difference between the measured value of the first temperature sensor and the measured value of the second temperature sensor continuously exceeds the predetermined temperature difference threshold value for a predetermined elapsed time. Output.

In the case of the above-mentioned cooler, if the amount of refrigerant is small, sufficient refrigerant flows through the cooling pipe (the cooling pipe at one end in the alignment direction) provided with the refrigerant supply / discharge port, but it is the farthest from the refrigerant supply / discharge port. A situation may occur in which sufficient refrigerant does not flow through the cooling pipes (the cooling pipes at the other end in the alignment direction). In that case, since a significant difference may occur between the flow rate of the refrigerant flowing through the cooling pipe at one end in the alignment direction and the flow rate of the refrigerant flowing through the cooling pipe at the other end in the alignment direction, it is attached to the cooling pipe at one end. The difference between the measured value of the first temperature sensor and the measured value of the second temperature sensor attached to the cooling pipe at the other end may be significantly different for a predetermined time continuously. Therefore, if the absolute value of the difference between the measured value of the first temperature sensor and the measured value of the second temperature sensor continuously exceeds the predetermined temperature difference threshold value for a predetermined elapsed time, the controller determines the cooler. Outputs a signal indicating the abnormality of.

Further, in the cooling system disclosed in the present specification, the first temperature sensor is attached to the cooling pipe at one end in the alignment direction, and the second temperature sensor is attached to the cooling pipe at the other end. Therefore, for example, when the cooler is mounted on a vehicle or the like so that the arrangement direction is not horizontal and is inclined, the cooling pipes located on the high side and the cooling pipes located on the low side due to the inclination are used. Since temperature sensors are attached to both, even if the refrigerant leaks to the outside from a part of the cooling pipe or connecting pipe, the temperature of the refrigerant can be measured by either the first temperature sensor or the second temperature sensor. It becomes possible to measure with high accuracy.

Details of the techniques disclosed herein, as well as further improvements, will be described in embodiments of the invention.

It is a schematic diagram of the cooler of an Example. It is sectional drawing of the laminated unit which comprises the cooler of an Example. It is a flowchart of the cooling system abnormality detection processing executed by the controller of a cooler. It is explanatory drawing which shows the change example of the temperature data measured by a temperature sensor.

The cooler of the embodiment will be described with reference to the drawings. Hereinafter, as an example of the cooler, those mounted on a hybrid vehicle or an electric vehicle will be described. These vehicles are equipped with a motor as a driving source for traveling. In the case of a hybrid vehicle, it also has an engine. The power to drive the motor is supplied by the main battery. The output voltage of the main battery is, for example, 300 volts, whereas the motor is driven by, for example, 600 volts of three-phase AC power. Therefore, a power converter is connected between the main battery and the motor.

The power converter includes, for example, a voltage converter that boosts the voltage of the main battery to the drive voltage of the motor (for example, 600 volts), an inverter that converts the boosted DC power into alternating current, and a power controller that controls them. The voltage converter is composed of switching elements such as a reactor and an IGBT. Further, the inverter is composed of a switching element or the like that performs a switching operation corresponding to each phase (U, V, W) of the motor. Since these switching elements generate a large amount of heat during the switching operation, they are cooled by, for example, the cooler of the present embodiment.

FIG. 1 shows a schematic view of the cooler 2 of the embodiment. The stacking unit 3 is a component that cools each switching element 23 (described later) constituting a voltage converter or an inverter, and is a component that forms the main body of the cooler 2. As will be described in detail later, in the laminated unit 3, a plurality of flat cooling pipes 11, 12, 13 (sometimes simply referred to as cooling pipes 11 and the like) are arranged in a row, and between adjacent cooling pipes 11 and the like. A power card 20 having a switching element 23 is sandwiched (see FIG. 2). Hereinafter, the arrangement direction of the cooling pipes 11 and the like is simply referred to as the arrangement direction. In the cooler 2 of the embodiment, the temperature sensor 31 is attached to the cooling pipe 11 at one end in the alignment direction, and the temperature sensor 33 is attached to the cooling pipe 13 at the other end in the alignment direction.

The controller 50 of the cooler 2 also serves as the controller of the power converter described above. That is, in the cooler 2 of the embodiment, the controller 50 that controls the switching element of the voltage converter or the inverter performs the cooling system abnormality detection process described later. Therefore, the temperature sensors 31 and 33 are connected to the controller 50, and the host controller 70 is connected as a higher-level system thereof. As a result, the temperature information (measured value) output by the temperature sensors 31 and 33 can be acquired by the controller 50, and the result of information processing by the controller 50 can be acquired by the host controller 70.

Next, the configuration of the laminated unit 3 will be described in detail with reference to FIG. FIG. 2 shows a cross-sectional view of the laminated unit 3. The stacking unit 3 is formed by alternately stacking a cooling pipe 11 and the like and a power card 20. In this embodiment, the cooling pipe 11 is located at one end in the alignment direction (X-axis direction), and the cooling pipe 13 is located at the other end in the alignment direction (X-axis direction). Six cooling pipes 12 are located between these cooling pipes 11 and 13. Then, seven power cards 20 are sandwiched between each of the eight cooling pipes 11, 12, and 13.

The power card 20 is a flat plate-shaped electronic component in which two switching elements 23 are sealed in a resin package 21. In this embodiment, the two switching elements 23 are arranged in the longitudinal direction (Y-axis direction) of the resin package 21. The switching element 23 is a semiconductor element (power device) for power conversion, and generates a large amount of heat when energized (on state). Therefore, the heat generated by the switching element 23 is diffused to the outside (cooling tubes 11, 12, 13). Three electrode terminals (not shown) protrude from above the power card 20 (positive direction of Z axis), and six control terminals (not shown) protrude from below (negative direction of Z axis). ing.

An insulating plate is typically interposed between the cooling pipe 11 and the like and the power card 20, or grease is applied to reduce the thermal resistance, but these are not shown. The laminated unit 3 is typically housed in a housing of a power converter. In the present specification, the X, Y, and Z axes of the coordinate system shown in FIG. 2 are simply referred to as the X axis, the Y axis, and the Z axis, respectively.

The cooling pipes 11 and the like also have a flat shape like the power card 20, and are arranged side by side in a row so that their flat surfaces face each other. The power card 20 is sandwiched between adjacent flat surfaces such as cooling pipes 11. In this embodiment, the adjacent cooling pipes 11 and the like are connected by connecting pipes 7 and 8, respectively. In addition to the connecting pipes 7 and 8, the refrigerant supply pipe 5 and the refrigerant discharge pipe 6 are also connected to the cooling pipe 11 at one end in the alignment direction (X-axis direction).

The cooling pipe 11 is composed of, for example, an outer plate 14 obtained by pressing a thin aluminum plate or the like. An inflow port 11a to which the refrigerant supply pipe 5 is connected and an outflow port 11b to which the refrigerant discharge pipe 6 is connected are formed on one end side in the alignment direction (X-axis direction), and the other end side in the alignment direction. Is formed with a connecting port 11c to which the connecting pipes 7 and 8 are connected. Flange portions are formed around these.

A corrugated plate in which a plurality of fold-like irregularities are repeatedly formed in the lateral direction (Z-axis direction) so that the refrigerant can flow along the longitudinal direction (Y-axis direction) of the cooling pipe 11 in the pipe inner space 11x. Members (not shown) are housed. Further, in this embodiment, the temperature sensor 31 is attached to the flat surface of the outer plate 14 on the side not facing the power card 20.

Like the cooling pipe 11, the plurality of cooling pipes 12 located between the cooling pipe 11 and the cooling pipe 13 are also composed of an outer plate 14 having an inflow port 12a, an outflow port 12b, and a connecting port 12c. In the case of the cooling pipe 12, the connecting pipe 7 is connected to the inflow port 12a of the cooling pipe 12, and the connecting pipe 8 is connected to the outflow port 12b. The pipe interior space 12x also accommodates a corrugated sheet member (not shown) similar to that accommodated in the pipe interior space 11x.

The cooling pipe 13 located at the other end in the alignment direction (X-axis direction) is also composed of an outer plate 15 obtained by pressing a thin aluminum plate or the like, similarly to the outer plate 14 of the cooling pipe 11. However, the inflow port 13a and the outflow port 13b to which the connecting pipes 7 and 8 are connected are only formed on one end side in the alignment direction. Since the cooling pipe 13 is located at the other end of the laminating unit 3, it does not have a connecting port for supplying the refrigerant to the downstream side. In addition, the pipe member (not shown) is also housed in the pipe space 13x, which is the same as that housed in the pipe spaces 11x and 12x. Further, in this embodiment, the temperature sensor 33 is attached to the flat surface of the outer plate 15 on the side not facing the power card 20.

In this embodiment, when the laminated unit 3 is housed in the housing of the power converter, a leaf spring (not shown) is inserted into one end side or the other end side in the alignment direction (X-axis direction). Loads are applied to the cooling pipe 11 and the like and the power card 20 from both sides in the alignment direction. Further, the refrigerant is stored in the reservoir tank on the upstream side connected to the refrigerant supply pipe 5, is pumped to the stacking unit 3, and returns to the reservoir tank via the refrigerant pipe downstream of the refrigerant discharge pipe 6. It circulates in a round route. Refrigerant pipes, reservoir tanks and pumps are not shown. The refrigerant is a liquid, typically water or LLC (Long Life Coolant).

The plurality of connecting pipes 7 and the plurality of connecting pipes 8 are arranged so as to be located on both sides of the power card 20 when viewed from the arrangement direction. The plurality of connecting pipes 7 are arranged so as to be arranged in a row in the arrangement direction, and the plurality of connecting pipes 8 are also arranged so as to be arranged in a row in the arrangement direction. The refrigerant supply pipe 5 is arranged so as to overlap the plurality of connecting pipes 7 when viewed from the arrangement direction, and the refrigerant discharge pipe 6 is arranged so as to overlap the plurality of connecting pipes 8 when viewed from the arrangement direction.

By configuring the laminated unit 3 in this way, the refrigerant supplied through the refrigerant supply pipe 5 is distributed to all the cooling pipes 11 and the like through the connecting pipe 7 (dashed-dotted line arrow shown in FIG. 2) (FIG. 2). Dashed arrow shown in). The refrigerant distributed to the cooling pipe 11 and the like is collected by the connecting pipe 8 after absorbing the heat generated by the adjacent power card 20 when passing through the pipe spaces 11x, 12x and 13x of the cooling pipe 11 and the like. It is discharged from the refrigerant discharge pipe 6. As a result, most of the heat generated by the power card 20 can be dissipated by heat exchange with the refrigerant flowing through the cooling pipe 11 and the like of the stacking unit 3.

By the way, the refrigerant flowing through the cooling pipe 11 and the like may leak to the outside from other than the refrigerant supply pipe 5 and the refrigerant discharge pipe 6 for some reason. In addition, foreign matter or the like may accumulate in the pipe space 11x, 12x, 13x of the cooling pipe 11 or the like, making it difficult for the refrigerant to flow. In these cases, the flow rate of the refrigerant flowing through the space 11x or the like in the cooling pipe 11 or the like is reduced in a part of the cooling pipe 11 or the like, so that the power card 20 may not be able to sufficiently dissipate heat.

In particular, in the arrangement direction of the cooling pipes 11 and the like, the housing of the power converter is in an inclined state in which the cooling pipe 13 at the other end exists at a higher position than the cooling pipe 11 at one end (the cooling pipe 13 at the other end). When the cooling pipe 11 at one end is mounted in the vehicle in an inclined state in which it exists at a lower position than the cooling pipe 11 at one end, it is located on the downstream side of the cooling pipe 11 on the upstream side when viewed from the refrigerant supply pipe 5. The flow rate of the refrigerant flowing into the cooling pipe 13 is reduced. Therefore, the power card 20 sandwiched and cooled between the cooling pipe 12 and the cooling pipe 13 is less likely to dissipate heat than the power card 20 sandwiched between the cooling pipe 11 and the cooling pipe 12.

Therefore, in the cooler 2 of the present embodiment, as shown in FIG. 3, such leakage of the refrigerant can be detected by the cooling system abnormality detection process executed by the controller 50. FIG. 3 shows a flowchart of the cooling system abnormality detection process. Further, FIG. 4 shows an explanatory diagram showing an example of changes in temperature data measured by the temperature sensors 31 and 33.

The process shown in FIG. 3 is performed immediately after, for example, the controller 50 starts controlling the switching elements of the voltage converter and the inverter. That is, the cooling system abnormality detection process is executed by the controller 50 between the time when the power switch (starting switch) of the hybrid vehicle or the electric vehicle is turned on and the time when the switch is turned off.

In the cooling system abnormality detection process, first, the temperature data acquisition process is performed in step S11. In this process, the temperature data measured by the two temperature sensors 31 and 33 attached to the stacking unit 3 is acquired. The temperature data of the temperature sensor 31 represents the temperature of the refrigerant flowing through the cooling pipe 11 at one end of the laminated unit 3, or a temperature close to the temperature, and the temperature data of the temperature sensor 33 indicates the cooling pipe 13 at the other end of the laminated unit 3. It represents the temperature of the flowing refrigerant or a temperature close to it. Hereinafter, the temperature of the refrigerant or a temperature close to the temperature of the refrigerant is simply referred to as a refrigerant temperature.

In the subsequent step S13, a process of calculating the difference between these refrigerant temperatures is performed. For example, when the temperature of the refrigerant flowing through the cooling pipe 11 at one end is Ha and the temperature of the refrigerant flowing through the cooling pipe 13 at the other end is Hb, the absolute value of the temperature difference between Ha and Hb is Hd = │Ha−Hb. The controller 50 calculates │. When the refrigerant properly circulates in the laminated unit 3, the absolute value Hd of the temperature difference is approximately equal or falls within a predetermined temperature difference threshold value Hx (see FIG. 4 (A), FIG. 4 (B)). After the time Ta shown in (1) and immediately before Tb). The predetermined temperature difference threshold value Hx is predetermined, for example, based on the statistical data of an actual vehicle, the result of an experiment or a computer simulation, and the like.

However, when the refrigerant is not properly circulated in the laminated unit 3, for example, when the refrigerant leaks to the outside from other than the refrigerant supply pipe 5 and the refrigerant discharge pipe 6, or when the pipe space 11x, 12x such as the cooling pipe 11 is used. , When foreign matter or the like is accumulated in 13x and the refrigerant is difficult to flow, the absolute value Hd of the temperature difference between Ha and Hb can exceed a predetermined temperature difference threshold Hx (after the time Tb shown in FIG. 4B). ).

Therefore, in the subsequent step S15, it is determined whether or not the absolute value Hd of the difference between the two temperatures Ha and Hb measured by the temperature sensors 31 and 33 exceeds the predetermined temperature difference threshold value Hx. If the absolute value Hd does not exceed the predetermined temperature difference threshold value Hx (S15; NO), it can be estimated that the refrigerant is properly circulating in the laminated unit 3, so that the temperature sensor is returned to step S11 again. Obtain temperature data from 31 and 33.

On the other hand, when the absolute value Hd exceeds the predetermined temperature difference threshold value Hx (S15; YES), the duration thereof is determined in the next step S17. That is, it is determined whether or not the predetermined time Tx has elapsed from the time when it is first determined that the absolute value Hd exceeds the predetermined temperature difference threshold value Hx. The predetermined time Tx is, for example, a period during which it can be clearly determined that the refrigerant is not properly circulated in the laminated unit 3. The predetermined time Tx is predetermined based on, for example, statistical data from an actual vehicle, the result of an experiment or a computer simulation, and the like.

Then, when it is determined in step S17 that the predetermined time Tx has not elapsed (S17; NO), the absolute value Hd may be a measurement error (after the time Tb shown in FIG. 4B). Immediately before Tc). Therefore, the process returns to step S11, and the temperature data is acquired from the temperature sensors 31 and 33 again. On the other hand, when it is determined that the predetermined time Tx has elapsed (S17; YES), the absolute value Hd is, for example, the refrigerant leaking to the outside from other than the refrigerant supply pipe 5 and the refrigerant discharge pipe 6. It is highly probable that foreign matter or the like is accumulated in the pipe space 11x, 12x, 13x of the cooling pipe 11 or the like, making it difficult for the refrigerant to flow (after the time Tc shown in FIG. 4B).

In such a case, the cooling system abnormality signal output processing is performed in step S19. For example, the controller 50 outputs a cooling system abnormality signal indicating that an abnormality has occurred in the cooling system to the host controller 70. As a result, the host controller 70 performs processing such as displaying the abnormality information of the cooling system on the instrument panel and recording the abnormality information of the cooling system in the log file of the vehicle diagnosis data. As a result, when the refrigerant is not properly circulated in the laminated unit 3, the driver of the vehicle can grasp that the laminated unit 3 of the power converter is not normal (abnormal).

As described above, in the cooler 2 of the present embodiment, the temperature sensor 31 is attached to the cooling pipe 11 at one end in the arrangement direction (X-axis direction) among the plurality of cooling pipes 11 arranged side by side in a row. The temperature sensor 33 is attached to the cooling pipe 13 at the other end in the alignment direction (X-axis direction). Then, when the absolute value Hd of the difference between the temperature data Ha of the temperature sensor 31 and the temperature data Hb of the temperature sensor 33 continuously exceeds the predetermined temperature difference threshold Hx during the predetermined elapsed time Tx. (S17; YES), a signal indicating an abnormality of the cooler 2 is output (S19).

That is, after the refrigerant flowing into the cooling pipe 11 at one end in the alignment direction (X-axis direction) passes through the cooling pipe 13 at the other end in the alignment direction (X-axis direction) via the connecting pipe 7, the connecting pipe 8 is connected. When the refrigerant can return to the cooling pipe 11 at one end and flow out from the cooling pipe 11 at one end, and the refrigerant does not leak to the outside from other than the refrigerant supply pipe 5 and the refrigerant discharge pipe 6, the arrangement direction It is unlikely that a significant difference will occur between the flow rate of the refrigerant flowing through the cooling pipe 11 at one end and the flow rate of the refrigerant flowing through the cooling pipe 13 at the other end in the alignment direction. Therefore, it is assumed that the temperature data Ha of the temperature sensor 31 attached to the cooling pipe 11 at one end and the temperature data Hb of the temperature sensor 33 attached to the cooling pipe 13 at the other end are substantially the same or different. But the difference is small.

On the other hand, when the refrigerant leaks to the outside from a part of the connecting pipes 7 and 8, the flow rate of the refrigerant flowing through the cooling pipe 11 and the like decreases. Therefore, a significant difference may occur between the flow rate of the refrigerant flowing through the cooling pipe 11 at one end in the alignment direction and the flow rate of the refrigerant flowing through the cooling pipe 13 at the other end in the alignment direction. The difference between the temperature data Ha of the temperature sensor 31 attached to 11 and the temperature data Hb of the temperature sensor 33 attached to the cooling pipe 13 at the other end may be significantly different for a predetermined time. Therefore, when the absolute value Hd of the difference between the temperature data Ha and Hb of the temperature sensors 31 and 33 continuously exceeds the predetermined temperature difference threshold Hx for the predetermined elapsed time Tx, the controller 50 cools the cooler. By outputting a signal indicating the abnormality of 2, it is possible to detect the abnormality of the cooler 2.

Further, in the cooler 2 of the present embodiment, the temperature sensor 31 is attached to the cooling pipe 11 at one end in the alignment direction (X-axis direction), and the temperature sensor 33 is attached to the cooling pipe 13 at the other end in the alignment direction (X-axis direction). Is installed. Therefore, for example, when the laminated unit 3 is inclined in the arrangement direction of the cooling pipes 11 and the like and mounted on a vehicle or the like, the cooling pipes 13 (or the cooling pipes 11) located on the higher side of the height due to the inclination and the cooling pipes 11 and the like. Since the temperature sensors 31 and 33 are attached to any of the cooling pipes 11 (or cooling pipes 13) located on the lower side, the refrigerant leaks to the outside from the cooling pipes 11 and a part of the connecting pipes 7 and 8. Even when it comes out, it becomes possible to accurately measure the temperature of the refrigerant by either the temperature sensor 31 or the temperature sensor 33.

In the above embodiment, the case where the controller 50 that controls the voltage converter and the inverter of the power converter executes the cooling system abnormality detection process has been described as an example, but another controller (for example, the upper controller 70) may be used. The cooling system abnormality detection process of FIG. 3 may be executed. In this case, it is necessary to configure the cooler so that the temperature data output from the temperature sensors 31 and 33 is input to the controller that executes the cooling system abnormality detection process.

Further, in the above embodiment, the case where the controller 50 that executes the cooling system abnormality detection process outputs the cooling system abnormality signal to the upper controller 70 has been described as an example, but the controller 50 outputs the cooling system abnormality signal. Instead, the controller 50 may be configured to perform processing such as displaying a cooling system abnormality on the instrument panel or recording a cooling system abnormality in a log file of vehicle diagnostic data. ..

Further, in the above embodiment, the case where the temperature sensors 31 and 33 are attached to the cooling pipe 11 at one end and the cooling pipe 13 at the other end in the alignment direction has been illustrated and described, but the cooling located between them has been described. Another temperature sensor may be attached to the tube 12 to form a cooler so that the temperature data can be output to the controller 50 or the like. As a result, the temperature data of the refrigerant flowing through the pipe space 12x of the cooling pipe 12 can also be acquired, so that highly accurate abnormality detection can be performed based on various temperature differences that can be calculated.

The points to be noted regarding the example technique will be described. The connecting pipe 7 corresponds to one example of a pair of connecting pipes. The connecting pipe 8 corresponds to the other example of the pair of connecting pipes. The cooling pipes 11 correspond to an example of cooling pipes at one end in the alignment direction. The cooling pipe 13 corresponds to an example of a cooling pipe at the other end in the alignment direction. The power card 20 corresponds to an example of a heating element. The temperature sensor 31 corresponds to an example of the first temperature sensor. The temperature sensor 33 corresponds to an example of the second temperature sensor. The refrigerant supply pipe 5 and the refrigerant discharge pipe 6 correspond to an example of a pair of refrigerant supply / discharge ports.

Although specific examples of the present invention have been described in detail above, these are merely examples and do not limit the scope of claims. The techniques described in the claims include various modifications and modifications of the specific examples illustrated above. In addition, the technical elements described in the present specification or the drawings exhibit technical usefulness alone or in various combinations, and are not limited to the combinations described in the claims at the time of filing. In addition, the techniques illustrated in the present specification or drawings achieve a plurality of objectives at the same time, and achieving one of the objectives itself has technical usefulness.

2: Cooler 3: Laminating unit 5: Refrigerant supply pipe 6: Refrigerant discharge pipe 7, 8: Connecting pipes 11, 12, 13: Cooling pipe 20: Power card 21: Resin package 23: Switching element 31, 33: Temperature sensor 50: Controller 70: Upper controller

Claims (1)

A plurality of cooling pipes arranged in a row, and a plurality of cooling pipes in which a heating element is sandwiched between the adjacent cooling pipes.
A pair of connecting pipes located on both sides of the heating element and connecting adjacent cooling pipes when viewed from the arrangement direction of the plurality of cooling pipes.
A pair of refrigerant supply / discharge ports provided in the cooling pipe at one end in the alignment direction and located so as to overlap each of the connecting pipes when viewed from the alignment direction.
A first temperature sensor attached to the cooling pipe at one end in the alignment direction,
A second temperature sensor attached to the cooling pipe at the other end in the alignment direction,
Outputs a signal indicating an abnormality when the absolute value of the difference between the measured value of the first temperature sensor and the measured value of the second temperature sensor continuously exceeds the predetermined temperature difference threshold value for a predetermined elapsed time. Controller and
A cooler equipped with.

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