DC-DC Voltage Converter

Abstract

The present application relates to a DC-DC voltage converter, and relates to the technical field of voltage conversion. It aims to solve the technical problem that the local heat dissipation efficiency is low, the temperature of the part that needs heat dissipation rises, and the conversion efficiency is affected. It includes a casing and a circuit board installed in the casing. The casing is provided with a heat dissipation duct inside the casing, and a positive pressure source for promoting air flow is provided at one end of the heat dissipation duct. The heat dissipation duct is provided with a guide surface at the positive pressure source. The heat dissipation duct is provided with a guide channel on the side of the guide surface away from the positive pressure source, and a converging surface is provided on the side of the guide channel close to the guide surface. The converging surface is used to increase the air flow rate when passing through the chip and the triode on the circuit board. The guide channel is provided with a diffusion surface at the end away from the return surface, and a heat conduction plate in contact with the circuit board is provided on the bottom wall of the guide channel. The present application has the effect of facilitating the maintenance of the internal temperature of the converter and ensuring the conversion efficiency.

Description

Technical Field

[0001] The present application relates to the field of voltage conversion, and in particular to a DC-DC voltage converter. Background Art

[0002] A DC-DC converter is a voltage regulating device that adjusts the input voltage to the required output voltage. It can be divided into a boost converter, a buck converter, and a buck-boost converter according to the needs.

[0003] In the related art, a Chinese patent with a publication number of CN108923621A discloses a DC-DC voltage converter, which is characterized in that: it includes an insulating shell, a containing space with an opening at one end is provided inside the insulating shell, a bottom plate is provided at the containing space away from the opening end, a plurality of metal pins with one end provided inside the containing space and the other end passing through the containing space are provided at intervals around the shell, a circuit board and a plurality of heat sinks are provided in the containing space, the circuit board is electrically connected to the plurality of metal pins, and the other end of the circuit board relatively connected to the plurality of metal pins is connected to the heat sink in a thermally conductive manner, no glue is required inside the voltage converter, and the disadvantage of short circuit or accidental open circuit caused by alternate expansion and pushing of soldering due to lead-free reflow is avoided, and a heat sink is provided to expand the heat dissipation surface area of ​​the circuit board and improve the stability of the product.

[0004] With respect to the above-mentioned related technologies, the inventors believe that there is a defect that the local heat dissipation efficiency is low, which easily leads to an increase in the temperature of the part that needs heat dissipation, thereby affecting the conversion efficiency. Summary of the invention

[0005] In order to reduce the heat dissipation temperature and improve the conversion efficiency, the present application provides a DC-DC voltage converter.

[0006] The present application provides a DC-DC voltage converter adopting the following technical solution:

[0007] A DC-DC voltage converter comprises a casing and a circuit board installed in the casing, wherein the casing is provided with a heat dissipation duct inside the casing, a positive pressure source for promoting air flow is provided at one end of the heat dissipation duct, a negative pressure source for promoting air circulation is provided at one end of the heat dissipation duct away from the positive pressure source, a guide surface is provided at the positive pressure source of the heat dissipation duct, a guide channel is provided at a side of the guide channel away from the positive pressure source, a converging surface is provided at a side of the guide channel close to the guide surface, the converging surface is used to increase the air flow rate when passing through a chip and a triode on the circuit board, a diffusion surface is provided at one end of the guide channel away from the return surface, and a heat conduction plate in contact with the circuit board is provided on the bottom wall of the guide channel.

[0008] By adopting the above technical solution, the positive pressure source and the negative pressure source promote the accelerated flow of air in the heat dissipation duct. At the same time, the heat dissipation duct is highly compressed by the guide surface, and the gap between adjacent guide channels is reduced by the converging surface. At this time, the speed of air passing through the gap between two adjacent guide channels will be significantly improved. At this time, the heat transfer plate transfers the heat on the end of the circuit board that generates more heat to the heat dissipation duct. At this time, due to the increase in the flow rate of the medium, the heat exchange efficiency will also be improved. After the air is diffused through the diffusion surface, the air stays in the heat dissipation duct for a longer time. At this time, the heat on the circuit board carried in the air is fully in contact with the heat dissipation duct after being diffused through the diffusion surface, and the heat is fully dissipated, thereby reducing the problem of excessively high local temperature inside the casing and ensuring the efficiency of DC-DC conversion.

[0009] Preferably, the heat dissipation duct is provided with a plurality of corrugated plates on the side of the diffusion surface away from the converging surface, the corrugated plates are arranged along the length direction of the heat dissipation duct, the outer wall of the heat dissipation duct located at the corrugated plates is provided with an insulation layer, and the insulation layer is located between the heat dissipation duct and the circuit board.

[0010] By adopting the above technical solution, the contact area between the air and the inner wall of the heat dissipation duct is made larger through the setting of the corrugated plate. Since the heat dissipation duct is in direct contact with the air, it is easier to exchange heat in the air with the heat dissipation duct. Since the heat insulation layer is arranged between the heat dissipation duct and the circuit board, the heat insulation layer can reduce the heat conduction to the circuit board, so as not to affect the normal operation of other components on the circuit board.

[0011] Preferably, a temperature detection device is provided on the circuit board, and a signal output end of the temperature detection device is electrically connected to a comparison module to output temperature data, and another signal input end of the comparison module is electrically connected to a reference value circuit, and the comparison module is used to compare the temperature data and the reference value and output a comparison signal, and the signal output end of the comparison module is electrically connected to a control device to receive the comparison signal and output a control signal, and a regulating device for adjusting the return surface angle to adjust the air flow rate between adjacent guide channels is provided in the guide channel, and the regulating device responds to the control signal to adjust the confluence surface angle.

[0012] By adopting the above technical solution, the temperature detection device can detect the temperature on the circuit board and transmit the temperature data to the comparison module. The comparison module compares the temperature data with the reference value and outputs a comparison signal. The control device controls the adjustment device to start when the temperature data is higher than the reference value. At this time, the adjustment device adjusts the angle of the reflow surface to increase, thereby reducing the gap between two adjacent guide channels. At this time, the wind speed of the air flowing through the guide channel can be increased, thereby further improving the heat exchange efficiency.

[0013] Preferably, the guide channel includes two guide plates, two adjustment plates and two limit plates. A positioning rod is provided in the heat dissipation air duct. The two guide plates are hinged on the positioning rod together. The guide plates, adjustment plates and limit plates are hinged in sequence. An adjustment rod is slidingly connected in the heat dissipation air duct along the length direction of the heat dissipation air duct. The two limit plates are hinged on the positioning rod. The adjustment device is provided between the two adjustment plates to adjust the spacing between the adjustment plates.

[0014] By adopting the above technical solution, the adjustment device adjusts the distance between the two adjustment plates. Since the guide plate, the adjustment plate and the limit plate are hinged in sequence and the two guide plates are hinged on the same positioning rod, it is possible to adjust the distance between the two adjustment plates through the adjustment device to achieve the change in the angle of the confluence surface, thereby achieving the effect of adjusting the wind speed between two adjacent guide channels.

[0015] Preferably, the adjusting device includes a screw rod fixedly connected to each adjusting plate, a rotating block threadedly connected to the screw rod, a limit block sleeved on the two driving blocks, and a driving assembly for driving the rotating block to rotate, the limit block is provided with a clearance hole for the rotating block to rotate, and a mounting groove communicating with the clearance hole is provided on one side surface of the limit block, and the mounting groove is used to install the rotating block, and the moving directions of the two screw rods are opposite.

[0016] By adopting the above technical solution, the driving component drives the rotating block to rotate. Since the rotating block is threadedly connected to the screw rod and the screw rod is fixed on the adjusting plate and cannot rotate, the rotation of the rotating block can drive the two screw rods to move toward or away from each other, thereby realizing the movement of the two adjusting plates toward or away from each other; since the screw rod is inserted into the limit block in relative directions, the position of the limit block can be limited. The driving component drives the two rotating blocks to rotate, which ensures the force balance of the limit block and also realizes the synchronous movement of the screw rod.

[0017] Preferably, the driving assembly includes a rotating gear arranged on the rotating block, a driving gear meshing with the rotating gear, a transmission shaft, a driving worm wheel arranged on the transmission shaft, a driving worm meshing with the driving worm wheel, and a driving motor driving the driving worm wheel to rotate, the driving motor is electrically connected to the control device, and the transmission shaft is passed through the driving gear to drive the two driving gears to rotate.

[0018] By adopting the above technical solution, the driving motor drives the driving worm to rotate, and the driving worm drives the driving worm wheel to rotate. Since driving gears are fixed at both ends of the transmission shaft and the driving gears and the rotating gears are meshed with each other, two or four gears can be driven to rotate by one driving motor, thereby ensuring the balance of force and the synchronous movement of the two adjustment plates.

[0019] Preferably, the outer wall of the heat dissipation duct is provided with a limiting hole for the sliding movement of the adjustment rod, the adjustment rod passes through the heat dissipation duct from the limiting hole, and one end of the adjustment rod passing through the heat dissipation duct is threadedly connected to a fixing block that abuts against the outer wall of the heat dissipation duct.

[0020] By adopting the above technical solution, the adjusting rod is installed inside the heat dissipation duct from the limiting hole, which not only facilitates the installation of the heat dissipation duct, but also provides position limitation for the movement of the adjusting rod, thereby ensuring the adjustment trajectory of the adjusting rod; on the other hand, the setting of the fixing block can fix the adjusting rod in the limiting hole.

[0021] Preferably, a closing plate is provided between the fixing block and the outer side wall of the heat dissipation duct, and the distance between the end wall of the closing plate and the adjusting rod is longer than the length of the limiting hole.

[0022] By adopting the above technical solution, the setting of the closing plate makes it easy to close the closing hole, greatly reducing the entry of dust and other debris into the heat dissipation air duct to affect the wind speed, thereby ensuring the heat dissipation efficiency.

[0023] Preferably, the outer side wall of the heat dissipation duct is provided with a plurality of heat dissipation plates, and the heat dissipation plates are provided with positioning holes for the closing plates to be inserted.

[0024] By adopting the above technical solution, the provision of the heat dissipation plate increases the contact area between the outer wall of the heat dissipation duct and the air, so that the air gradually dissipates heat outwards in the process of passing through the heat dissipation duct, which facilitates the heat inside the casing to be dissipated outwards.

[0025] Preferably, the heat dissipation branch pipe is provided with a wind speed detection device between two adjacent guide channels, the signal output end of the wind speed detection device is electrically connected to the control device, the positive pressure source and the negative pressure source are connected to a speed regulation device, and the control end of the speed regulation device is electrically connected to the control device to receive a speed regulation signal from the control device.

[0026] By adopting the above technical solution, the setting of the wind speed detection device facilitates the detection of the wind speed between the two guide channels and provides real-time feedback to the control device. When the wind speed still cannot be increased to the preset value after the adjustment of the adjustment device, the control device controls the speed regulation device to adjust the speed of the positive pressure source and the negative pressure source, thereby promoting the increase of the operating speed of the positive pressure source and the negative pressure source to increase the wind speed, thereby improving the heat dissipation efficiency.

[0027] In summary, the present application includes at least one of the following beneficial technical effects:

[0028] 1. By adopting the technology of matching heat dissipation duct, positive pressure source, negative pressure source, guide surface, guide channel, converging surface, diffusion surface, heat conduction plate, corrugated plate and heat insulation layer, it is convenient to control different wind speeds, thereby changing the heat dissipation wind speed, improving the heat dissipation efficiency and maintaining the conversion efficiency;

[0029] 2. By adopting the technology of matching the temperature detection device, the comparison module, the control device, the guide plate, the adjustment plate, the limit plate, the positioning rod, the adjustment rod, the screw rod, the rotating block, the limit block, the driving assembly, the rotating gear, the driving gear, the transmission shaft, the driving worm gear, the driving worm and the driving motor, the distance between two adjacent guide channels is automatically adjusted, so that the wind speed can be adjusted to adapt to different temperature environments.

[0030] 3. By adopting the technology of matching limiting holes, closing plates, fixing blocks, heat dissipation plates, positioning holes, wind speed detection devices and speed regulating devices, it is convenient to further increase the wind speed and maintain the heat dissipation efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a schematic diagram of the overall structure of a DC-DC voltage converter in an embodiment of the present application;

[0032] Figure 2 is a cross-sectional view used to show the internal structure of the casing in the embodiment of the present application;

[0033] Figure 3 is a cross-sectional view used to show the top structure of the casing in the embodiment of the present application;

[0034] Figure 4 is a schematic diagram for showing the structure of the regulating device in the embodiment of the present application;

[0035] Figure 5 is a schematic diagram for showing the structure of the limiting hole of the casing in the embodiment of the present application;

[0036] Figure 6 A circuit diagram for demonstrating the control relationship of a control device in an embodiment of the present application.

[0037] Description of reference numerals: 1, housing; 11, bottom plate; 12, circuit board; 121, heat conducting plate; 122, temperature detection device; 1221, comparison module; 1222, control device; 13, heat dissipation plate; 131, positioning hole; 14, thermal insulation layer; 2, heat dissipation duct; 21, positive pressure source; 211, flow guide surface; 22, limiting hole; 221, closing plate; 222, fixing block; 23, wave plate; 24, wind speed detection device; 241, speed regulating device; 25, sliding groove; 251, square hole; 26, Negative pressure source; 3. flow guide channel; 30. positioning rod; 31. flow guide plate; 32. adjustment plate; 33. limit plate; 34. adjustment rod; 341. square plate; 35. adjustment device; 351. screw rod; 352. rotating block; 353. limit block; 3531. clearance hole; 3532. mounting groove; 36. driving assembly; 361. rotating gear; 362. driving gear; 363. transmission shaft; 364. driving worm wheel; 365. driving worm; 366. driving motor; 4. converging surface; 5. diffusion surface. DETAILED DESCRIPTION

[0038] The following is combined with Figure 1-6 This application is described in further detail.

[0039] The present application embodiment discloses a DC-DC voltage converter. Figure 1 The DC-DC voltage converter includes a housing 1, which is hollow inside and has an opening on one side, on which a bottom plate 11 is mounted. A circuit board 12 is mounted inside the housing 1 by bolts, and components of the DC-DC circuit are welded and fixed on the circuit board 12, wherein components that generate more heat, such as transistors and chips, are concentrated at one end, and components that generate less heat, such as capacitors, inductors and diodes, are concentrated at the other end.

[0040] Reference Figure 2 The inner wall of the housing 1 is integrally formed with a heat dissipation duct 2. Both the housing 1 and the heat dissipation duct 2 are made of aluminum alloy, and thus have good thermal conductivity. The outer wall of the heat dissipation duct 2 is integrally formed with a plurality of heat dissipation plates 13. The heat dissipation plates 13 are evenly arranged along the length direction of the housing 1 to increase the heat dissipation area of ​​the outer wall of the housing 1.

[0041] Reference Figure 1 and Figure 2 A positive pressure source 21 is installed at one end of the heat dissipation duct 2 by bolts, and the positive pressure source 21 is installed at the end of the heat dissipation duct 2 close to the circuit board 12 where more heat is generated. The positive pressure source 21 can be an axial flow fan, which promotes the air outside the housing 1 to enter the heat dissipation duct 2, and promotes the air to flow inside the heat dissipation duct 2 along the length direction of the heat dissipation duct 2, thereby performing heat exchange.

[0042] Reference Figure 2The end of the circuit board 12 close to the positive pressure source 21 is covered with a heat conducting plate 121, which is formed by a heat conducting silicone pad pasted on the circuit board 12. The side of the heat conducting plate 121 away from the circuit board 12 is pasted on the outer wall of the heat dissipation duct 2, so as to facilitate the heat on the circuit board 12 to be transferred to the heat dissipation duct 2.

[0043] Reference Figure 2 and Figure 3 The heat dissipation air duct 2 is located on one side of the positive pressure source 21 and is obliquely provided with a guide surface 211. The guide surface 211 makes the thickness of the heat dissipation air duct 2 tend to be flat to converge the air. The heat dissipation air duct 2 is welded and fixed with multiple positioning rods 30 along the width direction. The positioning rods 30 are located on the side of the guide surface 211 away from the positive pressure source 21. The positioning rods 30 can be four or three, depending on the width of the heat dissipation air duct 2. In this embodiment, three are preferred. A guide channel 3 is installed on each positioning rod 30. The guide channel 3 includes two guide plates 31, two adjustment plates 32 and two limit plates 33. The two guide plates 31 are hinged to the positioning rod 30.

[0044] Reference Figure 2 and Figure 3 , the guide plate 31, the adjustment plate 32 and the limit plate 33 are hinged in sequence, and the heights of the guide plate 31, the adjustment plate 32 and the limit plate 33 are consistent with the height of the heat dissipation duct 2, so that the vertical surface formed by the guide plate 31, the adjustment plate 32 and the limit plate 33 can completely block the flow of air. A converging surface 4 is formed between two adjacent guide plates 31 of different guide channels 3, and a diffusion surface 5 is formed between two adjacent limit plates 33 of different guide channels 3. After the air is input into the heat dissipation duct 2 from the positive pressure source 21, it converges to the space between the two adjacent adjustment plates 32 of different guide channels 3 through the converging surface 4. At this time, due to the reduction of the gap, the wind speed is bound to increase; at this time, due to the high flow rate, the heat exchange efficiency will be improved, so that the heat on the circuit board 12 can be easily exchanged with the air.

[0045] Reference Figure 2 and Figure 3 The heat dissipation duct 2 is welded and fixed with a corrugated plate 23 on the side of the diffusion surface 5 away from the converging surface 4. There are multiple corrugated plates 23 evenly distributed along the length direction of the heat dissipation duct 2 and along the width direction of the heat dissipation branch pipe. The outer wall of the heat dissipation duct 2 located at the corrugated plate 23 is bonded and fixed with a heat insulation layer 14. The heat insulation layer 14 can be formed by installing an aerogel felt on the heat dissipation duct 2. The heat insulation layer 14 covers from the end wall of the housing 1 to the end wall of the heat conducting plate 121. The heat insulation layer 14 is located between the heat dissipation duct 2 and the circuit board 12, thereby reducing the heat transfer to the circuit board 12.

[0046] Reference Figure 2 and Figure 3The heat dissipation duct 2 is slidably connected to a plurality of adjustment rods 34 along the length direction, and the adjustment rods 34 correspond to the positioning rods 30 one by one. The ends of the two limit plates 33 away from the adjustment plates 32 are both hinged to the positioning rods 30. An adjustment device 35 is installed between the two adjustment plates 32 of the same guide channel 3. The distance between the two adjustment plates 32 is adjusted by the adjustment device 35, so that the wind speed of the air in the heat dissipation duct 2 is increased, thereby improving the heat dissipation efficiency.

[0047] Reference Figure 3 and Figure 4 An adjusting device 35 is installed between the two adjusting plates 32 of the same flow guide 3 to adjust the spacing between the adjusting plates 32. The adjusting device 35 includes a screw rod 351, a rotating block 352, a stop block 353 and a driving assembly 36. The screw rod 351 is welded and fixed on the opposite surface of the adjusting plate 32. The rotating block 352 is threadedly connected to the screw rod 351 and embedded in the stop block 353. The stop block 353 is provided with a clearance hole 3531 for the rotating block 352 to rotate. The top of the clearance hole 3531 is provided with a mounting groove 3532. The mounting groove 3532 passes through the top wall of the rotating block 352 along the thickness direction and communicates with the clearance hole 3531 so as to facilitate the installation of the rotating block 352 into the clearance hole 3531. The driving assembly 36 is installed in the limit block 353 and is used to drive the limit block 353 to rotate. Since the screw rod 351 is fixed on the adjustment plate 32, the adjustment plate 32 will move toward or away from each other under the drive of the screw rod 351.

[0048] Reference Figure 3 and Figure 4 The driving assembly 36 includes a rotating gear 361, a driving gear 362, a transmission shaft 363, a driving worm wheel 364, a driving worm 365 and a driving motor 366. The transmission shaft 363 is arranged along the width direction through the middle of the limit block 353 in the width direction, and the rotating block 352 is installed at the end of the limit block 353. The rotating gear 361 is welded and fixed on the outer side wall of the rotating block 352, and the driving gear 362 is keyed to the transmission shaft 363 and meshes with the rotating gear 361. The driving worm gear 364 is key-connected to the middle part of the transmission shaft 363, the driving worm 365 is passed through the limit block 353 along the height direction and meshes with the driving worm gear 364, the driving motor 366 is installed at the bottom of the limit block 353 and the output shaft of the driving motor 366 is fixed to the driving worm 365 through a coupling, the driving motor 366 drives the driving worm 365 to rotate, and the driving worm 365 drives the driving worm gear 364 to rotate, thereby realizing the rotation of the rotating block 352 under the transmission of the transmission shaft 363.

[0049] Reference Figure 5The outer wall of the heat dissipation duct 2 is provided with a limit hole 22 for the adjustment rod 34 to slide. The limit hole 22 is a waist-shaped through hole. The adjustment rod 34 passes through the limit hole 22 to pass through the heat dissipation duct 2 and slides in the limit hole 22 along the length direction of the limit hole 22. One end of the adjustment rod 34 passing through the heat dissipation duct 2 is sleeved with a closing plate 221. The length of the closing plate 221 is longer than twice the length of the limit hole 22. The width of the adjustment plate 32 is greater than the width of the limit hole 22. The adjustment rod 34 is passed through the middle position of the closing plate 221 so that any side of the closing plate 221 can close the limit hole 22 when the adjustment rod 34 is located at the end of the limit hole 22.

[0050] Reference Figure 5 The end of the adjusting rod 34 away from the limiting hole 22 is threadedly connected to a square plate 341, and a sliding groove 25 for the square plate 341 to be inserted is provided at the bottom of the heat dissipation air duct 2, and the cross section of the sliding groove 25 is T-shaped. A square hole 251 for the installation of the square plate 341 is provided at one end of the sliding groove 25. The end of the adjusting rod 34 passing through the closing plate 221 is threadedly connected to a fixing block 222, and the fixing block 222 abuts against the surface of the closing plate 221, thereby limiting the position of the closing plate 221, so that the closing plate 221 fits tightly on the outer wall of the casing 1. A positioning hole 131 for the closing plate 221 to be inserted is provided on the surface of the heat dissipation plate 13 near the limiting hole 22, and the height of the positioning hole 131 is equal to the height of the adjusting rod 34 passing through the casing 1, and the width of the positioning hole 131 is equal to the width of the closing plate 221.

[0051] Reference Figure 2 and Figure 6 , a temperature detection device 122 is provided on the circuit board 12, and a signal output end of the temperature detection device 122 is electrically connected to a comparison module 1221 to output temperature data. The comparison module 1221 can be a comparator N, and the signal output end of the temperature detection device 122 is electrically connected to the non-inverting input end of the comparator N. Another signal input end of the comparison module 1221 is electrically connected to a reference value circuit, and the reference value circuit includes a first resistor R1 and a second resistor R2 connected in series in a power supply circuit, the other end of the first resistor R1 is electrically connected to a power supply, and the other end of the second resistor R2 is grounded. The connection point of the first resistor R1 and the second resistor R2 is connected to the reverse input end of the comparison module 1221 as the output end of the reference value circuit. The second resistor R2 is an adjustable resistor, and the adjustment knob is installed inside the housing 1, so that the temperature threshold can be manually adjusted.

[0052] Reference Figure 2 and Figure 6The signal output end of the comparison module 1221 is electrically connected to a control device 1222, which may be a single chip microcomputer. The signal output end of the control device 1222 is electrically connected to the control end of the drive motor 366 in the adjustment device 35. The single chip microcomputer controls the drive motor 366 to rotate a predetermined angle by sending a square wave signal, thereby moving the adjustment plate 32 to a predetermined position, thereby adjusting the spacing between the adjustment plates 32, and then driving the angle of the converging surface 4 to change, thereby adjusting the wind speed.

[0053] Reference Figure 3 and Figure 6 The heat dissipation duct 2 is located between two of the guide channels 3 and is provided with a wind speed detection device 24, which is an ultrasonic wind speed sensor, and the signal output end of the wind speed sensor is electrically connected to the data input end of the control device 1222. The end of the heat dissipation duct 2 away from the positive pressure source 21 is bolted with a negative pressure source 26 for promoting air circulation, and the negative pressure source 26 can be a negative pressure fan, which is convenient for the air inside the heat dissipation duct 2 to be discharged from the outside of the heat dissipation duct 2. The positive pressure source 21 and the negative pressure source 26 are connected together with a speed regulating device 241, which can be a PWM speed regulator, and the signal output end of the control device 1222 is electrically connected to the control end of the speed regulating device 241 to receive the speed regulating signal from the control device 1222 when the wind speed cannot reach the preset value after the regulating device 35 adjusts the distance of the regulating plate 32, thereby adjusting the rotation speed of the positive pressure source 21 and the negative pressure source 26 to adjust the wind speed.

[0054] The implementation principle of a DC-DC voltage converter in the embodiment of the present application is:

[0055] During the operation of the circuit board 12, the transistor and the chip continue to generate heat, and the temperature detection device 122 detects the temperature change. When the temperature data is higher than the reference value, the comparison module 1221 outputs a comparison signal to the control device 1222, and the control device 1222 sends a control signal to the drive motor 366. The drive motor 366 starts to drive the drive worm 365 to rotate, and the drive worm 365 drives the drive worm wheel 364 to drive the transmission shaft 363 to rotate, and the drive gear 362 on the transmission shaft 363 rotates accordingly. At this time, the rotating block 352 rotates. Since the screw 351 is fixed on the adjustment plate 32 and the adjustment plate 32 is restricted in the heat dissipation duct 2, the screw 351 drives the adjustment plate 32 to move in the back. At this time, the spacing between the adjustment plates 32 between different guide channels 3 is reduced, and the angle of the confluence surface 4 composed of different guide channels 3 is increased, the distance of the air is compressed, and the wind speed increases. At this time, since the heat on the circuit board 12 is conducted to the heat dissipation duct 2 through the heat conduction plate 121, when the wind speed increases, the heat exchange efficiency between the air and the heat dissipation duct 2 increases, thereby facilitating the heat inside the casing 1 to dissipate outward, thereby reducing the possibility of reduced conversion efficiency due to local overtemperature, thereby ensuring the conversion efficiency of the converter.

[0056] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A DC-DC voltage converter, characterized in that: The invention comprises a casing (1) and a circuit board (12) installed in the casing (1); the casing (1) is provided with a heat dissipation duct (2) inside the casing (1); one end of the heat dissipation duct (2) is provided with a positive pressure source (21) for promoting air flow; the end of the heat dissipation duct (2) away from the positive pressure source (21) is provided with a negative pressure source (26) for promoting air circulation; the heat dissipation duct (2) is provided with a guide surface (211) at the positive pressure source (21); the heat dissipation duct (2) is provided with a guide channel (3) at a side of the guide channel (211) away from the positive pressure source (21); the guide channel (3) is provided with a converging surface (4) at a side close to the guide surface (211); the converging surface (4) is used to increase the air flow rate when passing through a chip and a transistor on the circuit board (12); the guide channel (3) is provided with a diffusion surface (26) at an end away from the return surface 5), the bottom wall of the flow guide channel (3) is provided with a heat conduction plate (121) in contact with the circuit board (12), the circuit board (12) is provided with a temperature detection device (122), the signal output end of the temperature detection device (122) is electrically connected to a comparison module (1221) to output temperature data, the other signal input end of the comparison module (1221) is electrically connected to a reference value circuit, the comparison module (1221) is used to compare the temperature data and the reference value and output a comparison signal, the signal output end of the comparison module (1221) is electrically connected to a control device (1222) to receive the comparison signal and output a control signal, and the flow guide channel (3) is provided with an adjustment device (35) for adjusting the angle of the return surface to adjust the air flow rate between adjacent flow guide channels (3), and the adjustment device (35) responds to the control signal to adjust the angle of the converging surface (4).

2. The DC-DC voltage converter according to claim 1, characterized in that: The heat dissipation duct (2) is provided with a plurality of wave plates (23) on the side of the diffusion surface (5) away from the converging surface (4); the wave plates (23) are arranged along the length direction of the heat dissipation duct (2); the outer wall of the heat dissipation duct (2) located at the wave plates (23) is provided with a heat insulation layer (14); and the heat insulation layer (14) is located between the heat dissipation duct (2) and the circuit board (12).

3. The DC-DC voltage converter according to claim 1, characterized in that: The guide channel (3) comprises two guide plates (31), two adjustment plates (32) and two limit plates (33); a positioning rod (30) is provided in the heat dissipation air duct (2); the two guide plates (31) are hinged on the positioning rod (30); the guide plates (31), the adjustment plates (32) and the limit plates (33) are hinged in sequence; an adjustment rod (34) is slidably connected in the heat dissipation air duct (2) along the length direction of the heat dissipation air duct (2); the two limit plates (33) are hinged on the positioning rod (30); and the adjustment device (35) is provided between the two adjustment plates (32) to adjust the spacing between the adjustment plates (32).

4. The DC-DC voltage converter according to claim 3, characterized in that: The adjusting device (35) comprises a screw rod (351) fixedly connected to each adjusting plate (32), a rotating block (352) threadedly connected to the screw rod (351), a limit block (353) sleeved on two driving blocks, and a driving assembly (36) for driving the rotating block (352) to rotate. The limit block (353) is provided with a clearance hole (3531) for the rotating block (352) to rotate. A mounting groove (3532) communicating with the clearance hole (3531) is provided on one side surface of the limit block (353). The mounting groove (3532) is used to mount the rotating block (352). The moving directions of the two screw rods (351) are opposite.

5. The DC-DC voltage converter according to claim 4, characterized in that: The driving assembly (36) comprises a rotating gear (361) arranged on the rotating block (352), a driving gear (362) meshing with the rotating gear (361), a transmission shaft (363), a driving worm wheel (364) arranged on the transmission shaft (363), a driving worm (365) meshing with the driving worm wheel (364), and a driving motor (366) driving the driving worm (365) to rotate, wherein the driving motor (366) is electrically connected to the control device (1222), and the transmission shaft (363) is passed through the driving gear (362) to drive the two driving gears (362) to rotate.

6. The DC-DC voltage converter according to claim 5, characterized in that: The outer wall of the heat dissipation duct (2) is provided with a limiting hole (22) for the adjustment rod (34) to slide, the adjustment rod (34) passes through the limiting hole (22) to exit the heat dissipation duct (2), and one end of the adjustment rod (34) passing through the heat dissipation duct (2) is threadedly connected to a fixing block (222) that abuts against the outer wall of the heat dissipation duct (2).

7. The DC-DC voltage converter according to claim 6, characterized in that: A closing plate (221) is provided between the fixing block (222) and the outer wall of the heat dissipation duct (2), and the distance between the end wall of the closing plate (221) and the adjusting rod (34) is longer than the length of the limiting hole (22).

8. The DC-DC voltage converter according to claim 7, characterized in that: The outer side wall of the heat dissipation duct (2) is provided with a plurality of heat dissipation plates (13), and the heat dissipation plates (13) are provided with positioning holes (131) for inserting the closing plate (221).

9. The DC-DC voltage converter according to claim 5, characterized in that: The heat dissipation air duct (2) is provided with a wind speed detection device (24) located between two adjacent flow guide channels (3); a signal output end of the wind speed detection device (24) is electrically connected to a control device (1222); the positive pressure source (21) and the negative pressure source (26) are connected to a speed regulating device (241); a control end of the speed regulating device (241) is electrically connected to the control device (1222) to receive a speed regulating signal from the control device (1222).

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