Over-temperature protection device for DC-DC converter

Abstract

The utility model provides a DC-DC converter over-temperature protection device which comprises a shell and a top cover connected with the shell, the shell is used for installing a PCB of a DC-DC converter, the DC-DC converter over-temperature protection device further comprises a heat dissipation unit, the heat dissipation unit comprises a heat conduction block, an induced draft fan and a temperature sensor, the top cover is provided with an air inlet, and the heat conduction block is connected with the induced draft fan. The induced draft fan is installed in the air inlet, the temperature sensor is arranged in the shell, and the temperature sensor is connected with the induced draft fan through a controller; notches are formed in the two sides of the shell, the heat conduction blocks are installed in the notches in a sliding mode, a plurality of heat conduction pieces are arranged on the heat conduction blocks, a plurality of air outlet holes are formed between the adjacent heat conduction pieces, the heat conduction blocks make contact with heating components in a PCB of the DC-DC converter, and the heat conduction efficiency of the heat conduction blocks is larger than that of the shell. According to the utility model, the heat dissipation effect of the converter can be improved in actual use, and the heat dissipation effect can be ensured while the cost is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of converters, and specifically discloses an over-temperature protection device for a DC-DC converter. Background Art

[0002] The DC-DC converter is constructed to convert the input voltage into a stable and effective output fixed voltage and is widely used in various fields. In particular, in fuel cell vehicles, the DC-DC converter, as an indispensable key component of the fuel cell system, can increase the output voltage of the fuel cell and ensure the stability of the output voltage when the load changes, thereby achieving smooth power output. With the development of technology, low-cost, small-size, and high-power-density DC-DC converters have received more and more attention. Here, in order to meet the technical requirements for DC-DC converters, good heat dissipation performance is a necessary condition to allow the power module of the DC-DC converter to operate at full load without exceeding the limit temperature.

[0003] In the prior art, heat sink fins are generally directly arranged on the casing to achieve the purpose of rapid heat dissipation. However, the whole body is made of materials with relatively good thermal conductivity, which easily increases the cost. Moreover, only heat sink fins are used for heat dissipation, the heat dissipation effect of the converter is poor, and the protection effect on the converter is limited. Utility Model Content

[0004] The utility model aims to provide a DC-DC converter over-temperature protection device, which can improve the heat dissipation effect of the converter in actual use, and can reduce costs while ensuring the heat dissipation effect.

[0005] In order to solve the above technical problems, the technical solution adopted by the utility model is:

[0006] A DC-DC converter over-temperature protection device comprises a housing and a top cover connected to the housing, wherein the housing is used to install a PCB circuit board of the DC-DC converter, the utility model further comprises a heat dissipation unit, wherein the heat dissipation unit comprises a heat conductive block, an induced draft fan and a temperature sensor, an air inlet is arranged on the top cover, the induced draft fan is installed in the air inlet, the temperature sensor is arranged in the housing, and the temperature sensor is connected to the induced draft fan through a controller;

[0007] Notches are provided on both sides of the shell, and the heat conductive block is slidably installed in the notches. A plurality of heat conductive sheets are provided on the heat conductive block, and a plurality of air outlet holes are provided between adjacent heat conductive sheets. The heat conductive block contacts the heat generating components in the PCB circuit board of the DC-DC converter, and the heat conductive efficiency of the heat conductive block is greater than the heat conductive efficiency of the shell.

[0008] Wherein, a guide protrusion is arranged at the notch, and a guide groove matching the guide protrusion is arranged on the heat conducting block.

[0009] Furthermore, a transverse heat-conducting block is provided in the shell. The transverse heat-conducting block is located above the PCB circuit board. Both ends of the transverse heat-conducting block are in close contact with the heat-conducting blocks on the shell.

[0010] Wherein, the inner wall of the heat conducting block is provided with a first protective net for shielding the air outlet.

[0011] Preferably, a second protective net for shielding the air inlet is provided on the top cover.

[0012] Furthermore, the outer shell and the top cover are connected by screws.

[0013] Among them, a waterproof and breathable membrane is arranged at the air inlet.

[0014] Furthermore, an indicator light and a miniature buzzer are provided on the shell, and both the indicator light and the miniature buzzer are connected to the controller.

[0015] Compared with the prior art, the utility model has the following beneficial effects:

[0016] The utility model is mainly used to realize rapid heat dissipation of the converter. In actual use, the heat conducting block is slidably installed on the shell, so that the heat conducting block and the shell form a split structure. Since the heat conducting efficiency of the heat conducting block is greater than that of the shell, the heat conducting block and the shell are made of two different materials, which can effectively reduce the material cost while ensuring the heat conducting effect. When the temperature sensor detects that the temperature inside the shell rises, the controller can control the induced draft fan to start, and introduce the external cold air into the shell, so that the heat inside the shell can be dissipated from the air outlet, and since the air outlet is located between adjacent heat conducting sheets, flowing air is formed between the adjacent heat conducting sheets, thereby improving the heat dissipation efficiency of the heat conducting sheets. Under the action of the induced draft fan and the heat conducting block, rapid heat dissipation and cooling of the converter can be realized. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solution of the implementation mode of the utility model, the drawings required for use in the implementation mode will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 It is a schematic diagram of the overall structure of the utility model.

[0019] Figure 2 It is a schematic diagram of the matching relationship between the housing and the heat conducting block of the utility model.

[0020] Figure 3It is a schematic diagram of the installation relationship between the top cover and the induced draft fan of the utility model.

[0021] Reference numerals:

[0022] 101-housing, 102-top cover, 103-PCB circuit board, 104-heat conductive block, 105-draft fan, 106-air inlet, 107-screw, 108-notch, 109-heat conductive sheet, 110-air outlet, 111-guide protrusion, 112-guide groove, 113-lateral heat conductive block, 114-second protective net, 115 heating components. DETAILED DESCRIPTION

[0023] In the following, only some exemplary embodiments are briefly described. As those skilled in the art will appreciate, the described embodiments may be modified in various ways without departing from the spirit or scope of the embodiments of the present invention. Therefore, the drawings and descriptions are considered to be exemplary and non-restrictive in nature.

[0024] In the description of the embodiments of the present invention, it should be understood that the terms "length", "vertical", "horizontal", "top", "bottom", etc. indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the embodiments of the present invention.

[0025] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the embodiments of the present utility model, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0026] In the embodiments of the present utility model, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or a communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present utility model can be understood according to specific circumstances.

[0027] In the embodiments of the present utility model, unless otherwise clearly specified and limited, the first feature being "above" or "below" the second feature may include the first and second features being in direct contact, or may include the first and second features not being in direct contact but being in contact through another feature between them. Moreover, the first feature being "above", "above" and "above" the second feature includes the first feature being directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature includes the first feature being directly above and obliquely above the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0028] The disclosure below provides many different embodiments or examples for realizing different structures of the embodiments of the present utility model. In order to simplify the disclosure of the embodiments of the present utility model, the components and settings of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the embodiments of the present utility model. In addition, the embodiments of the present utility model can repeat reference numbers and / or reference letters in different examples, and this repetition is for the purpose of simplification and clarity, and does not itself indicate the relationship between the various embodiments and / or settings discussed.

[0029] The embodiments of the present utility model are described in detail below with reference to the accompanying drawings.

[0030] See also Figure 1-Figure 3 This embodiment discloses a DC / DC converter over-temperature protection device, comprising a housing 101 and a top cover 102 connected to the housing 101, wherein the housing 101 is used to mount a PCB circuit board 103 of the DC-DC converter.

[0031] This embodiment also includes a heat dissipation unit, which includes a heat conductive block 104, an induced draft fan 105 and a temperature sensor. An air inlet 106 is provided on the top cover 102, and the induced draft fan 105 is installed in the air inlet 106. The temperature sensor is arranged in the housing 101, and the temperature sensor is connected to the induced draft fan 105 through a controller;

[0032] Notches 108 are provided on both sides of the shell 101, and the heat-conducting block 104 is slidably installed in the notches 108. A plurality of heat-conducting sheets 109 are provided on the heat-conducting block 104, and a plurality of air outlet holes 110 are provided between adjacent heat-conducting sheets 109. The heat-conducting block 104 is in contact with the heat-generating components 115 in the PCB circuit board 103 of the DC-DC converter, and the heat-conducting efficiency of the heat-conducting block 104 is greater than that of the shell 101.

[0033] In actual use, the heat-conducting block 104 is slidably installed on the shell 101, so that the heat-conducting block 104 and the shell 101 form a split structure. Since the heat-conducting efficiency of the heat-conducting block 104 is greater than that of the shell 101, the heat-conducting block 104 and the shell 101 are made of two different materials, which can effectively reduce the material cost while ensuring the heat-conducting effect; when the temperature sensor detects that the temperature inside the shell 101 rises, the controller can control the induced draft fan 105 to start, and introduce the external cold air into the shell 101, so that the heat inside the shell 101 can be dissipated from the air outlet 110, and since the air outlet 110 is located between adjacent heat-conducting sheets 109, flowing air is formed between adjacent heat-conducting sheets 109, thereby improving the heat dissipation efficiency of the heat-conducting sheets; under the action of the induced draft fan and the heat-conducting block 104, the converter can achieve rapid heat dissipation and cooling.

[0034] In actual use, the materials of the housing 101 and the heat-conducting block 104 can be selected as needed, and the material of the heat-conducting block 104 can preferably be a metal material, such as copper.

[0035] A guide protrusion 111 is provided at the notch 108 , and a guide groove 112 matching the guide protrusion 111 is provided on the heat conducting block 104 , so as to facilitate the installation of the heat conducting block 104 and the housing 101 .

[0036] Furthermore, a transverse heat-conducting block 113 is provided in the shell 101. The transverse heat-conducting block 113 is located above the PCB circuit board 103. Both ends of the transverse heat-conducting block 113 are in close contact with the heat-conducting block 104 on the shell 101, so as to quickly conduct the internal heat to the heat-conducting block 104 and improve the heat dissipation effect.

[0037] Furthermore, the inner wall of the heat conducting block 104 is provided with a first protective net for shielding the air outlet.

[0038] In some specific implementation cases, a second protective net 114 is provided on the top cover 102 for shielding the air inlet.

[0039] The housing 101 and the top cover 102 are connected via screws 107 .

[0040] Optionally, in some cases, a waterproof and breathable membrane is provided at the air inlet 106 to reduce the entry of external water vapor into the interior of the housing 101 .

[0041] Furthermore, in actual use, an indicator light and a micro buzzer are provided on the housing 101, and both the indicator light and the micro buzzer are connected to the controller. The indicator light and the micro buzzer can be used to give an early warning when high temperature occurs, thereby preventing the converter from being damaged due to continuous overheating.

[0042] Although the preferred embodiments of the present invention have been described, those skilled in the art may make other changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications falling within the scope of the present invention.

[0043] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. It should be pointed out that any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A DC-DC converter over-temperature protection device, comprising a housing and a top cover connected to the housing, wherein the housing is used to mount a PCB circuit board of the DC-DC converter, and is characterized in that: It also includes a heat dissipation unit, which includes a heat conduction block, an induced draft fan and a temperature sensor. The top cover is provided with an air inlet, the induced draft fan is installed in the air inlet, the temperature sensor is arranged in the housing, and the temperature sensor is connected to the induced draft fan through a controller; Notches are provided on both sides of the shell, and the heat conductive block is slidably installed in the notches. A plurality of heat conductive sheets are provided on the heat conductive block, and a plurality of air outlet holes are provided between adjacent heat conductive sheets. The heat conductive block contacts the heat generating components in the PCB circuit board of the DC-DC converter, and the heat conductive efficiency of the heat conductive block is greater than the heat conductive efficiency of the shell.

2. The over-temperature protection device for a DC-DC converter according to claim 1, characterized in that: A guide protrusion is arranged at the notch, and a guide groove matching the guide protrusion is arranged on the heat conducting block.

3. The over-temperature protection device for a DC-DC converter according to claim 1, characterized in that: A transverse heat-conducting block is also arranged in the shell. The transverse heat-conducting block is located above the PCB circuit board. Both ends of the transverse heat-conducting block are in close contact with the heat-conducting blocks on the shell.

4. The over-temperature protection device for a DC-DC converter according to claim 1, characterized in that: The inner wall of the heat conducting block is provided with a first protective net for shielding the air outlet.

5. The over-temperature protection device for a DC-DC converter according to claim 1, characterized in that: A second protective net for shielding the air inlet is arranged on the top cover.

6. The over-temperature protection device for a DC-DC converter according to claim 1, characterized in that: The outer shell and the top cover are connected by screws.

7. The over-temperature protection device for a DC-DC converter according to claim 1, characterized in that: A waterproof and breathable membrane is provided at the air inlet.

8. A DC-DC converter over-temperature protection device according to any one of claims 1 to 7, characterized in that: An indicator light and a micro buzzer are arranged on the shell, and both the indicator light and the micro buzzer are connected to the controller.

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