Heat dissipation device, transformer and electric power system

Abstract

The utility model provides a heat dissipation device, a transformer and a power system. The heat dissipation device comprises a heat dissipation fan used for dissipating heat of a heat dissipation object; the switch control circuit is electrically connected with the cooling fan so as to control the cooling fan to be powered on and powered off; wherein the switch control circuit comprises a smoke detector, and when the smoke detector detects smoke, the switch control circuit controls the cooling fan to be powered off. And when the heat dissipation object is burnt, the heat dissipation fan does not continue to dissipate heat of the heat dissipation object, so that the problem of fire spread caused by the fact that the heat dissipation fan continues to conduct air cooling heat dissipation when the heat dissipation object is burnt can be solved.

Description

Technical Field

[0001] This application relates to the field of heat dissipation technology, specifically to a heat dissipation device, a transformer, and a power system. Background Technology

[0002] Currently, in existing technologies, cooling fans typically operate continuously to ventilate and dissipate heat from the heat source. However, under certain extreme conditions, such as heat source failure or even fire, the cooling fan may remain running, potentially causing the fire to spread and the accident area to expand. Utility Model Content

[0003] This application provides a heat dissipation device, a transformer, and a power system, aiming to solve the above-mentioned technical problems.

[0004] In a first aspect, this application provides a heat dissipation device, comprising:

[0005] Cooling fans used to dissipate heat from objects;

[0006] A switch control circuit is electrically connected to the cooling fan to control the power supply to and from the cooling fan.

[0007] The switch control circuit includes a smoke detector, and when the smoke detector detects smoke, the switch control circuit controls the cooling fan to cut off power.

[0008] In some embodiments, the smoke detector has a first switch connection terminal and a second switch connection terminal;

[0009] The positive terminal of the cooling fan is connected to the first power line, the negative terminal of the cooling fan is connected to the first switch connection terminal of the smoke detector, and the second switch connection terminal of the smoke detector is connected to the second power line.

[0010] When the smoke detector detects smoke, the connection between the first switch connection terminal and the second switch connection terminal is broken.

[0011] In some embodiments, the switch control circuit further includes a first circuit breaker having a pull-in switch and a shunt trip coil;

[0012] The first end of the latching switch is connected to the first power line, the second end of the latching switch is connected to the positive terminal of the cooling fan, and the negative terminal of the cooling fan is connected to the second power line.

[0013] When the smoke detector detects smoke, the shunt trip coil is energized to control the closing switch to open.

[0014] In some embodiments, the smoke detector has a first switch connection terminal and a second switch connection terminal;

[0015] The first end of the shunt trip coil is connected to the first power supply line, the second end of the shunt trip coil is connected to the first switch connection terminal of the smoke detector, and the second switch connection terminal of the smoke detector is connected to the second power supply line.

[0016] When the smoke detector detects smoke, the path between the first switch connection terminal and the second switch connection terminal is connected.

[0017] In some embodiments, the switch control circuit further includes a first relay, which includes a first relay switch and a first relay coil;

[0018] The first terminal of the first relay switch is connected to the second power supply line, the second terminal of the first relay switch is connected to the first terminal of the shunt trip coil, and the second terminal of the shunt trip coil is connected to the first power supply line.

[0019] When the smoke detector detects smoke, the first relay coil is energized and the first relay switch is closed to energize the shunt trip coil and control the closing switch to open.

[0020] In some embodiments, the smoke detector has a first switch connection terminal and a second switch connection terminal;

[0021] The first end of the first relay coil is connected to the first pole of the first DC power supply, the second end of the first relay coil is connected to the second switch connection terminal of the smoke detector, and the first switch connection terminal of the smoke detector is connected to the second pole of the first DC power supply.

[0022] When the smoke detector detects smoke, the path between the first switch connection terminal and the second switch connection terminal is connected.

[0023] In some embodiments, the switch control circuit includes a second relay, which includes a second relay switch and a second relay coil;

[0024] The positive terminal of the cooling fan is connected to the first power line, the negative terminal of the cooling fan is connected to the first terminal of the second relay switch, and the second terminal of the second relay switch is connected to the second power line.

[0025] When the smoke detector detects smoke, the second relay coil is energized and the second relay switch is de-energized to control the cooling fan to shut off.

[0026] In some embodiments, the smoke detector has a first switch connection terminal and a second switch connection terminal;

[0027] The first end of the second relay coil is connected to the first pole of the second DC power supply, the second end of the second relay coil is connected to the first switch connection terminal of the smoke detector, and the second switch connection terminal of the smoke detector is connected to the second pole of the second DC power supply.

[0028] When the smoke detector detects smoke, the path between the first switch connection terminal and the second switch connection terminal is connected.

[0029] Secondly, this application provides a transformer including the heat dissipation device as described in the first aspect.

[0030] Thirdly, this application provides an electric power system including the transformer described in the second aspect.

[0031] This application electrically connects a switch control circuit to a cooling fan, using the switch control circuit to control the on / off state of the cooling fan, allowing the cooling fan to dissipate heat from the object being cooled. Since the switch control circuit includes a smoke detector, when the smoke detector detects smoke from the object being cooled, the switch control circuit can control the cooling fan to shut off. In other words, the cooling fan will not continue to dissipate heat from the object while it is burning, thus solving the problem of the cooling fan continuing to provide air cooling while the object is burning, which could lead to the spread of fire. Attached Figure Description

[0032] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0033] Figure 1 A schematic diagram of a heat dissipation device in an embodiment of this application is shown;

[0034] Figure 2 A schematic diagram of a smoke detector according to an embodiment of this application is shown;

[0035] Figure 3 Another schematic diagram of the heat dissipation device in an embodiment of this application is shown;

[0036] Figure 4 Another schematic diagram of the heat dissipation device in an embodiment of this application is shown;

[0037] Figure 5 Another schematic diagram of the heat dissipation device in an embodiment of this application is shown;

[0038] Figure 6 Another schematic diagram of the heat dissipation device in an embodiment of this application is shown;

[0039] Figure 7 Another schematic diagram of the heat dissipation device in an embodiment of this application is shown;

[0040] Figure 8Another schematic diagram of the heat dissipation device in an embodiment of this application is shown;

[0041] Figure 9 Another schematic diagram of the heat dissipation device in an embodiment of this application is shown.

[0042] Among them, 10 is a cooling fan, 20 is a switch control circuit, 21 is a smoke detector, 22 is a first circuit breaker, 23 is a first relay, and 24 is a second relay.

[0043] The components include a switching element SW, a first power supply line L, a second power supply line N, a first switch connection terminal NO1, a second switch connection terminal NO2, a pull-in switch S0, a shunt trip coil L0, a first relay switch S1, a first relay coil L1, a second relay switch S2, and a second relay coil L2. Detailed Implementation

[0044] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0045] In the description of this utility model, the term "exemplary" is used to mean "serving as an example, illustration, or description." Any embodiment described as "exemplary" in this application is not necessarily to be construed as being more preferred or advantageous than other embodiments. The following description is provided to enable any person skilled in the art to implement and use this utility model. Details are set forth in the following description for purposes of explanation. It should be understood that those skilled in the art will recognize that this utility model can be implemented without using these specific details. In other instances, well-known structures and processes will not be described in detail to avoid obscuring the description of this utility model with unnecessary detail. Therefore, this utility model is not intended to be limited to the embodiments shown, but is consistent with the broadest scope of the principles and features disclosed in this application.

[0046] This application provides a heat dissipation device, a transformer, and a power system, which will be described in detail below.

[0047] First, refer to Figure 1 , Figure 1 A schematic diagram of a heat dissipation device in an embodiment of this application is shown, wherein the heat dissipation device includes a cooling fan 10 and a switch control circuit 20.

[0048] Specifically, the cooling fan 10 is used to dissipate heat from a heat-dissipating object, which can be, but is not limited to, various electrical equipment or components of electrical equipment. For example, the heat-dissipating object can be a transformer, inverter, motor, or its windings. Transformers include single-phase transformers, three-phase transformers, dual-winding transformers, three-winding transformers, or autotransformers; inverters include centralized inverters, string inverters, or micro-inverters; and motors include DC motors or AC motors. For example, the cooling fan 10 can be, but is not limited to, an axial fan, centrifugal fan, mixed-flow fan, cross-flow fan, or blower fan.

[0049] The switch control circuit 20 is electrically connected to the cooling fan 10 to control the power supply to and from the cooling fan 10. For example, with Figure 1 For example, the first power line L is a single-phase AC line, the second power line N is a neutral line, the positive terminal of the cooling fan 10 is connected to the first power line L, and the negative terminal of the cooling fan 10 is connected to the switch control circuit 20. The switch control circuit 20 can control whether the negative terminal of the cooling fan 10 is connected to the second power line N, thereby controlling whether the cooling fan 10 is supplied with single-phase AC power and works.

[0050] Understandably, the above embodiments are illustrated by taking the cooling fan 10 as a single-phase AC power supply as an example. In some possible embodiments, the cooling fan 10 can also be powered by three-phase AC power or DC power. The switch control circuit 20 can control whether the cooling fan 10 is connected to a three-phase AC power supply or a DC power supply.

[0051] In this embodiment of the application, the switch control circuit 20 includes a smoke detector 21. When the smoke detector 21 detects smoke generated by the heat dissipation object, the switch control circuit 20 can control the cooling fan 10 to cut off the power, so as to avoid the phenomenon that the heat dissipation object continues to carry out air cooling heat dissipation while burning, thereby causing the fire to spread.

[0052] In some embodiments of this application, the smoke detector 21 has a sensing element and a switching element SW, for example, see [reference 1] Figure 2 , Figure 2 A schematic diagram of a smoke detector 21 in an embodiment of this application is shown. One end of the switching element SW is connected to the first switch connection terminal NO1 of the smoke detector 21, and the other end is connected to the second switch connection terminal NO2. After the VDD port and GND terminal of the smoke detector 21 are connected to a DC power supply, the sensing element can detect smoke and control the switching element SW to open when smoke is detected, so that the path between the first switch connection terminal NO1 and the second switch connection terminal NO2 is broken. Therefore, the power supply to the cooling fan 10 can be controlled by opening and closing the switching element SW of the smoke detector 21.

[0053] As an example, taking the smoke detector 21 as a photoelectric smoke detector, the sensing element of the smoke detector 21 can be a light-emitting diode (LED), and the switching element SW of the smoke detector 21 can be a photodiode. Under normal circumstances, the light emitted by the LED directly illuminates the photodiode, keeping the photodiode conducting. When smoke enters the smoke detector 21, the smoke particles scatter the light, causing the intensity of the light received by the photodiode to decrease. At this time, the photodiode is turned off. Therefore, the photodiode in the photoelectric smoke detector can be used as the switching element SW.

[0054] It is understood that in the above exemplary embodiment, the switching element SW of the smoke detector 21 is a normally closed switch, that is, the switching element SW is only opened when smoke is detected. However, it is not limited to this. In some possible embodiments, the switching element SW of the smoke detector 21 can also be a normally open switch, that is, the switching element SW is only closed when smoke is detected.

[0055] In this embodiment, the switch control circuit 20 is electrically connected to the cooling fan 10. The switch control circuit 20 controls the power supply to and from the cooling fan 10, allowing the cooling fan 10 to dissipate heat from the object being cooled. Since the switch control circuit 20 includes a smoke detector 21, when the smoke detector 21 detects smoke from the object being cooled, the switch control circuit 20 can control the cooling fan 10 to cut off the power. In other words, the cooling fan 10 will not continue to dissipate heat from the object being cooled while it is burning, thus solving the problem of the cooling fan 10 continuing to provide air cooling while the object is burning, which could lead to the spread of fire.

[0056] In some embodiments of this application, see Figure 3 , Figure 3 Another schematic diagram of the heat dissipation device in an embodiment of this application is shown, wherein the smoke detector 21 has a first switch connection terminal NO1 and a second switch connection terminal NO2; the positive terminal of the cooling fan 10 is connected to the first power line L, the negative terminal of the cooling fan 10 is connected to the first switch connection terminal NO1 of the smoke detector 21, and the second switch connection terminal NO2 of the smoke detector 21 is connected to the second power line N.

[0057] It should be noted that in the above embodiment, one of the first power line L and the second power line N is a single-phase AC power line, and the other is a neutral line. The switching element SW of the smoke detector 21 is a normally closed switch. That is, when the smoke detector 21 does not detect smoke from the object being cooled, the path between the first switch connection terminal NO1 and the second switch connection terminal NO2 remains connected, so the cooling fan 10 can be connected to the power supply normally and cool the object being cooled. However, when the smoke detector 21 detects smoke from the object being cooled, the switching element SW of the smoke detector 21 is opened, and the path between the first switch connection terminal NO1 and the second switch connection terminal NO2 is broken, thereby causing the cooling fan 10 to be de-energized and stop cooling, in order to prevent the fire from spreading due to the cooling fan 10.

[0058] In some embodiments of this application, see Figure 4 , Figure 4 Another schematic diagram of the heat dissipation device in an embodiment of this application is shown, wherein the switch control circuit 20 further includes a first circuit breaker 22, the first circuit breaker 22 having a pull-in switch S0 and a shunt trip coil L0; the first end of the pull-in switch S0 is connected to the first power line L, the second end of the pull-in switch S0 is connected to the positive terminal of the cooling fan 10, and the negative terminal of the cooling fan 10 is connected to the second power line N.

[0059] It should be noted that the closing switch S0 of the first circuit breaker 22 is a normally closed switch. When the shunt trip coil L0 is energized, it generates a magnetic force, which causes the closing switch S0 to open. When the smoke detector 21 does not detect smoke from the object being cooled, it controls the shunt trip coil L0 to de-energize, allowing the cooling fan 10 to normally connect to the power supply via the closing switch S0 and cool the object. However, when the smoke detector 21 detects smoke from the object being cooled, it controls the shunt trip coil L0 to energize, opening the closing switch S0 and causing the cooling fan 10 to de-energize and stop cooling, thus preventing the fire from spreading through the cooling fan.

[0060] In some embodiments of this application, such as the embodiment where the switch control circuit 20 further includes a first circuit breaker 22, see [reference]. Figure 5 , Figure 5 Another schematic diagram of the heat dissipation device in an embodiment of this application is shown, wherein the smoke detector 21 has a first switch connection terminal NO1 and a second switch connection terminal NO2; the first end of the shunt trip coil L0 is connected to the first power line L, the second end of the shunt trip coil L0 is connected to the first switch connection terminal NO1 of the smoke detector 21, and the second switch connection terminal NO2 of the smoke detector 21 is connected to the second power line N.

[0061] It should be noted that in the above embodiment, the switching element SW of the smoke detector 21 is a normally open switch. That is, when the smoke detector 21 does not detect smoke from the object being cooled, the path between the first switch connection terminal NO1 and the second switch connection terminal NO2 remains open. Therefore, the shunt trip coil L0 is not energized, and the closing switch S0 remains closed, allowing the cooling fan 10 to be connected to the power supply and cool the object normally. However, when the smoke detector 21 detects smoke from the object being cooled, the switching element SW of the smoke detector 21 closes, and the path between the first switch connection terminal NO1 and the second switch connection terminal NO2 is connected. Therefore, the shunt trip coil L0 is energized, and the closing switch S0 is opened, thereby de-energizing the cooling fan 10 and stopping cooling, thus preventing the fire from spreading due to the cooling fan 10.

[0062] As can be seen, the above embodiment controls the first circuit breaker 22 to open or close through the smoke detector 21, thereby indirectly controlling whether the cooling fan 10 is powered on. Compared with the embodiment that directly uses the internal switching element of the smoke detector 21 to control whether the cooling fan 10 is powered on, this embodiment is beneficial to solving the problem of node burnout caused by insufficient contact capacity of the smoke detector 21.

[0063] In some embodiments of this application, such as the embodiment where the switch control circuit 20 further includes a first circuit breaker 22, see [reference]. Figure 6 , Figure 6 Another schematic diagram of the heat dissipation device in an embodiment of this application is shown, wherein the switch control circuit 20 further includes a first relay 23, the first relay 23 includes a first relay switch S1 and a first relay coil L1; the first end of the first relay switch S1 is connected to the second power line N, the second end of the first relay switch S1 is connected to the first end of the shunt trip coil L0, and the second end of the shunt trip coil L0 is connected to the first power line L.

[0064] It should be noted that the first relay switch S1 of the first relay 23 is a normally open switch. When the first relay coil L1 is energized, it generates a magnetic force, which causes the first relay switch S1 to close. When the smoke detector 21 does not detect smoke from the object being cooled, the first relay coil L1 is not energized, the first relay switch S1 is open, and the shunt trip coil L0 is not energized. Therefore, the cooling fan 10 can be normally connected to the power supply via the closing switch S0 and cool the object being cooled. However, when the smoke detector 21 detects smoke from the object being cooled, the smoke detector 21 energizes the first relay coil L1, the first relay switch S1 closes, the shunt trip coil L0 is energized, and the closing switch S0 opens. This de-energizes the cooling fan 10, stopping its cooling function and preventing the fire from spreading due to the cooling fan 10.

[0065] In some embodiments of this application, such as the embodiment where the switch control circuit 20 further includes a first relay 23, see [reference]. Figure 7 , Figure 7 Another schematic diagram of the heat dissipation device in an embodiment of this application is shown. The smoke detector 21 has a first switch connection terminal NO1 and a second switch connection terminal NO2; the first end of the first relay coil L1 is connected to the first pole of the first DC power supply DC1, the second end of the first relay coil L1 is connected to the second switch connection terminal NO2 of the smoke detector 21, and the first switch connection terminal NO1 of the smoke detector 21 is connected to the second pole of the first DC power supply DC1.

[0066] It should be noted that in the above embodiment, one of the first and second terminals of the first DC power supply DC1 is positive and the other is negative. The switching element SW of the smoke detector 21 is a normally open switch. That is, when the smoke detector 21 does not detect smoke from the heat dissipation object, the path between the first switch connection terminal NO1 and the second switch connection terminal NO2 remains open. At this time, the first relay coil L1 is not energized, the first relay switch S1 is open, the shunt trip coil L0 is not energized, and the closing switch S0 remains closed. The cooling fan 10 can be connected to the power supply normally and dissipate heat from the heat dissipation object. However, when the smoke detector 21 detects smoke from the heat dissipation object, the switching element SW of the smoke detector 21 closes, and the path between the first switch connection terminal NO1 and the second switch connection terminal NO2 is connected. Therefore, the first relay coil L1 is energized, the first relay switch S1 is closed, the shunt trip coil L0 is energized, and the closing switch S0 is open, thereby de-energizing the cooling fan 10 and stopping heat dissipation to prevent the fire from spreading due to the cooling fan 10.

[0067] In some embodiments of this application, see Figure 8 , Figure 8 Another schematic diagram of the heat dissipation device in an embodiment of this application is shown, wherein the switch control circuit 20 includes a second electrical appliance 24, the second electrical appliance 24 includes a second relay switch S2 and a second relay coil L2; the positive terminal of the cooling fan 10 is connected to the first power line L, the negative terminal of the cooling fan 10 is connected to the first end of the second relay switch S2, and the second end of the second relay switch S2 is connected to the second power line N.

[0068] It should be noted that the first relay switch S1 of the second electrical appliance 24 is a normally closed switch. When the second relay coil L2 is energized, it generates a magnetic force, which causes the second relay switch S2 to open. When the smoke detector 21 does not detect smoke from the object being cooled, the second relay coil L2 is not energized, allowing the cooling fan 10 to be normally connected to the power supply via the second relay switch S2 and to cool the object. However, when the smoke detector 21 detects smoke from the object being cooled, it energizes the second relay coil L2, causing the second relay switch S2 to open, thus de-energizing the cooling fan 10 and stopping its cooling function, preventing the fire from spreading through the cooling fan.

[0069] In some embodiments of this application, the smoke detector 21 has a first switch connection terminal NO1 and a second switch connection terminal NO2; the first end of the second relay coil L2 is connected to the first pole of the second power supply DC2, the second end of the second relay coil L2 is connected to the first switch connection terminal NO1 of the smoke detector 21, and the second switch connection terminal NO2 of the smoke detector 21 is connected to the second pole of the second power supply DC2.

[0070] It should be noted that, in the second power supply DC2, one of the first and second terminals is positive and the other is negative. The switching element SW of the smoke detector 21 is a normally open switch. That is, when the smoke detector 21 does not detect smoke from the object being cooled, the path between the first switch connection terminal NO1 and the second switch connection terminal NO2 remains open. Therefore, the second relay coil L2 is not energized, and the second relay switch S2 remains closed, allowing the cooling fan 10 to be connected to the power supply and cool the object normally. However, when the smoke detector 21 detects smoke from the object being cooled, the switching element SW of the smoke detector 21 closes, and the path between the first switch connection terminal NO1 and the second switch connection terminal NO2 becomes open. Therefore, the second relay coil L2 is energized, and the second relay switch S2 is open, thereby de-energizing the cooling fan 10 and stopping cooling, thus preventing the fire from spreading due to the cooling fan 10.

[0071] Furthermore, to better implement the heat dissipation device in the embodiments of this application, this application also provides a transformer based on the heat dissipation device, the transformer including the heat dissipation device described in any of the above embodiments. Since the transformer in the embodiments of this application has all the beneficial effects of the heat dissipation device described above due to the inclusion of the heat dissipation device, it will not be elaborated further here.

[0072] Furthermore, to better implement the transformer in the embodiments of this application, based on the transformer, this application also provides a power system, which includes the transformer described in the above embodiments. Since the transformer in the power system of this application is equipped with the heat dissipation device described in the above embodiments, it possesses all the beneficial effects of the heat dissipation device, which will not be elaborated further here.

[0073] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the detailed descriptions of other embodiments above, which will not be repeated here.

[0074] The basic concepts have been described above. Obviously, for those skilled in the art, the detailed disclosure above is merely illustrative and does not constitute a limitation of this application. Although not explicitly stated herein, those skilled in the art may make various modifications, improvements, and corrections to this application. Such modifications, improvements, and corrections are suggested in this application, and therefore remain within the spirit and scope of the exemplary embodiments of this application.

[0075] Furthermore, this application uses specific terms to describe embodiments of the application. For example, "an embodiment," "one embodiment," and / or "some embodiments" refer to a particular feature, structure, or characteristic associated with at least one embodiment of the application. Therefore, it should be emphasized and noted that "an embodiment," "one embodiment," or "an alternative embodiment" mentioned twice or more in different locations in this specification do not necessarily refer to the same embodiment. In addition, certain features, structures, or characteristics in one or more embodiments of the application can be appropriately combined.

[0076] The above provides a detailed description of a heat dissipation device, transformer, and power system provided in the embodiments of this application. Specific examples have been used to illustrate the principle and implementation of this utility model. The description of the above embodiments is only for the purpose of helping to understand the method and core idea of ​​this utility model. At the same time, for those skilled in the art, there will be changes in the specific implementation and application scope based on the idea of ​​this utility model. Therefore, the content of this specification should not be construed as a limitation of this utility model.

Claims

1. A heat dissipating device, characterized by, include: Cooling fan; A switch control circuit is electrically connected to the cooling fan to control the power supply to and from the cooling fan. The switch control circuit includes a smoke detector, and when the smoke detector detects smoke, the switch control circuit controls the cooling fan to cut off power.

2. The heat dissipation device as described in claim 1, characterized in that, The smoke detector has a first switch connection terminal and a second switch connection terminal; The positive terminal of the cooling fan is connected to the first power line, the negative terminal of the cooling fan is connected to the first switch connection terminal of the smoke detector, and the second switch connection terminal of the smoke detector is connected to the second power line. When the smoke detector detects smoke, the connection between the first switch connection terminal and the second switch connection terminal is broken.

3. The heat dissipating device of claim 1, wherein The switch control circuit further includes a first circuit breaker, which has a pull-in switch and a shunt trip coil. The first end of the magnetic switch is connected to the first power line, the second end of the magnetic switch is connected to the positive terminal of the cooling fan, and the negative terminal of the cooling fan is connected to the second power line. When the smoke detector detects smoke, the shunt trip coil is energized to control the closing switch to open.

4. The heat dissipation device as described in claim 3, characterized in that, The smoke detector has a first switch connection terminal and a second switch connection terminal; The first end of the shunt trip coil is connected to the first power line, the second end of the shunt trip coil is connected to the first switch connection end of the smoke detector, and the second switch connection end of the smoke detector is connected to the second power line. When the smoke detector detects smoke, the path between the first switch connection terminal and the second switch connection terminal is connected.

5. The heat dissipating device of claim 3, wherein The switch control circuit further includes a first relay, which includes a first relay switch and a first relay coil; The first end of the first relay switch is connected to the second power line, the second end of the first relay switch is connected to the first end of the shunt trip coil, and the second end of the shunt trip coil is connected to the first power line. When the smoke detector detects smoke, the first relay coil is energized and the first relay switch is closed to energize the shunt trip coil and control the closing switch to open.

6. The heat dissipation device as described in claim 5, characterized in that, The smoke detector has a first switch connection terminal and a second switch connection terminal; The first end of the first relay coil is connected to the first pole of the first DC power supply, the second end of the first relay coil is connected to the second switch connection terminal of the smoke detector, and the first switch connection terminal of the smoke detector is connected to the second pole of the first DC power supply. When the smoke detector detects smoke, the path between the first switch connection terminal and the second switch connection terminal is connected.

7. The heat dissipating device of claim 1, wherein The switch control circuit includes a second relay, which includes a second relay switch and a second relay coil; The positive terminal of the cooling fan is connected to the first power line, the negative terminal of the cooling fan is connected to the first terminal of the second relay switch, and the second terminal of the second relay switch is connected to the second power line. When the smoke detector detects smoke, the second relay coil is energized and the second relay switch is de-energized to control the cooling fan to shut off.

8. The heat dissipating device of claim 7, wherein The smoke detector has a first switch connection terminal and a second switch connection terminal; The first end of the second relay coil is connected to the first pole of the second DC power supply, the second end of the second relay coil is connected to the first switch connection terminal of the smoke detector, and the second switch connection terminal of the smoke detector is connected to the second pole of the second DC power supply. When the smoke detector detects smoke, the path between the first switch connection terminal and the second switch connection terminal is connected.

9. A transformer, characterized in that, Includes the heat dissipation device as described in any one of claims 1 to 8.

10. A power system characterized by, Including the transformer as described in claim 9.

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