A stable planar transformer structure with LLC converter

Abstract

The application relates to the technical field of planar transformers, in particular to a stable planar transformer structure with an LLC converter, which comprises a shell, a heat exchange assembly, the heat exchange assembly comprising heat conduction plates, a plurality of heat exchange grooves being arranged in the heat conduction plates, and a power assembly, the power assembly comprising a sliding pipe, two limiting rings being fixedly sleeved on the inner wall of the sliding pipe and being arranged in an up-down distribution, a sealing ring being slidably connected to the inner wall of the sliding pipe, a magnetic ring being fixedly sleeved on the inner annular surface of the sealing ring, and a silica gel ring being fixedly sleeved on the inner annular surface of the magnetic ring. The stable planar transformer structure with the LLC converter separates the primary winding, the LLC converter and the secondary winding through two heat conduction plates, and utilizes the heat exchange grooves to communicate with the external environment, so that the heat on the devices is effectively removed through the heat conduction plates, and the performance instability and service life reduction caused by high heat of the primary winding, the LLC converter and the secondary winding are avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of planar transformers, and in particular to a stable planar transformer structure with an LLC converter. Background Art

[0002] A planar transformer is a small transformer that embeds the coil into a PCB board to achieve a voltage transformation effect. It is often used in adapter power supplies.

[0003] The prior art publication number CN219225996U uses a thermal insulation film to isolate the LLC converter from the heat source of the primary winding and the secondary winding, making the working environment of the LLC converter stable. However, the heat source will still act on the primary winding and the secondary winding, making the performance of the primary winding and the secondary winding unstable in a closed environment. In addition, the thermal insulation is achieved by laminating the thermal insulation film, which makes the laminating process more complicated and requires cutting, laminating and positioning, thereby increasing the difficulty of product manufacturing. Summary of the Invention

[0004] The purpose of the present invention is to provide a stable planar transformer structure with an LLC converter to solve the problem in the prior art proposed in the above background technology that the LLC converter is isolated from the heat source of the primary and secondary windings by a thermal insulation film, making the working environment of the LLC converter stable. However, the heat source still acts on the primary and secondary windings, making the performance of the primary and secondary windings unstable in a closed environment. In addition, the thermal insulation is achieved by laminating the thermal insulation film, which makes the laminating process more complicated and requires cutting, laminating, and positioning, thereby increasing the difficulty of product manufacturing. To achieve the above purpose, the present invention provides the following technical solutions: A stable planar transformer structure with an LLC converter, comprising a housing;

[0005] The heat exchange component includes a heat conducting plate, and a plurality of heat exchange slots are provided inside the heat conducting plate. Based on the premise of heat balance, the heat transfer relationship of the heat exchange slots is:

[0006] Q=K·A·Δt m (1)

[0007] Where: Q is the heat transfer power of the heat exchange tank, W; K is the total heat transfer coefficient based on the surface of the heat exchange tank, W (m 2 K) -1 ; A is the total heat transfer area based on the surface of the heat exchange tank, m 2 ;Δt m is the logarithmic mean temperature difference, °C. The total heat transfer coefficient K is calculated as:

[0008]

[0009] Where: h1 and h2 are the convection heat coefficients inside and outside the heat exchange tank, W·(m 2 K) -1 ; δ is the thickness of the tube wall, m; λ is the thermal conductivity of the tube wall, W / (m·℃).

[0010] A power assembly, the power assembly includes a sliding tube, two limit rings are fixedly sleeved on the inner wall of the sliding tube, and the two limit rings are distributed up and down to prevent the sliding tube from deflecting and falling off, a sealing ring is slidably connected to the inner wall of the sliding tube, a magnetic ring is fixedly sleeved on the inner ring surface of the sealing ring, a silicone ring is fixedly sleeved on the inner ring surface of the magnetic ring, and a silicone one-way valve is fixedly connected to the top of the silicone ring. The upper and lower chambers formed by the sliding tube separated by the magnetic ring are connected in one direction through the silicone one-way valve, ensuring that when the primary winding and the secondary winding continuously switch the direction of the alternating current, the magnetic ring moves back and forth up and down with the magnetic pole change of the magnetic field, and cooperates with the silicone one-way valve to repeatedly squeeze the air for heat exchange between the external environment and the internal environment, so that a mechanical heat dissipation effect can be achieved without additional functions;

[0011] A ventilation component, the ventilation component includes an upper channel and a lower channel, the lower channel and the upper channel are fixedly connected to the upper and lower chambers of the slide tube respectively, multiple heat exchange slots are fixedly connected with a collecting outer cover, and the collecting outer covers are fixedly connected to the two sides opposite to each other of the heat conduction plate, one of the collecting outer covers extends out of the shell and the top of the collecting outer cover extending out of the shell is fixedly connected with a channel outer cover, the channel outer cover is fixedly connected to the lower channel, and a silicone one-way valve 2 for one-way connection to the outside is provided on the side of the other collecting outer cover coplanar with the shell, and multiple air outlet holes connected to the outside are provided on the side of the upper channel coplanar with the shell.

[0012] Further preferably, the LLC converter is fixedly connected to the opposite side of the two heat conducting plates, and the opposite side of the two heat conducting plates is fixedly connected to an insulating sheet, the top of one of the insulating sheets is fixedly connected to the primary winding, and the bottom of the other insulating sheet is fixedly connected to the secondary winding, and the insulating sheet is made of alumina ceramic insulating sheet, which has the functions of insulation and heat conduction.

[0013] Further preferably, a clamping plate is fixedly connected to a side of the secondary winding opposite to the primary winding, and the clamping plate, primary winding, insulating sheet, heat conducting plate, LLC converter and secondary winding are all sleeved in the housing.

[0014] Further preferably, a magnetic core is fixedly connected to the clamping plate, primary winding, insulating sheet, heat conducting plate, LLC converter, and secondary winding. The magnetic core is an EI-type core, which has a compact structure and small size. Compared with traditional round magnetic cores, it has higher PCB area utilization efficiency. Its loss is negatively correlated with temperature, thus suppressing continuous temperature rise.

[0015] Further preferably, the top of the sliding tube is fixedly connected to the bottom of the cover plate, and the silicone one-way valve is V-shaped. The V-shaped one-way valve can realize linear adjustment of the fluid, so that the flow rate of the fluid is linearly related to the air pressure, and has good adjustment performance. The Bernoulli equation of flow rate and pressure is:

[0016]

[0017] Where: P is the pressure of the fluid, Pa, ρ is the density of the fluid kg / m 2 , v is the velocity of the fluid, m / s, z is the vertical height, m, g is the acceleration of gravity, m / s 2 , C is a constant.

[0018] Further preferably, the heat conducting plate is composed of a heat conducting plate and a cover plate and is formed by diffusion welding, and the heat exchange groove is formed by etching on the surface of the heat conducting plate.

[0019] Further preferably, the insulating sheet is made of alumina ceramic and is used for heat conduction and insulation, and the primary winding and the secondary winding are both formed by a PCB and a coil embedded thereon.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] In the present invention, the primary winding, LLC converter and secondary winding are separated by two heat-conducting plates, and are connected to the external environment by a heat exchange groove, so that the heat on the components can be effectively removed through the heat-conducting plates, thereby avoiding performance instability and shortened service life caused by high heat of the primary winding, LLC converter and secondary winding.

[0022] In the present invention, when the silicone one-way valve 1, the silicone one-way valve 2 and the magnetic ring are subjected to an electric field force, the magnetic ring drives the silicone one-way valve 1 to move back and forth and cooperates with the silicone one-way valve 2 to perform heat exchange between the external environment and the internal environment, so that a mechanical heat dissipation effect can be achieved without additional functions, and the heat dissipation efficiency and stable heat dissipation method are improved, so that the planar transformer with LLC converter has good stability and does not require traditional thermal insulation film for thermal insulation, so that there is no need to perform thermal insulation film bonding processing on internal devices, thereby reducing the pressing and positioning processes in the laminating process, thereby improving processing efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention;

[0024] Figure 2 This is a schematic diagram of the explosion structure of the present invention;

[0025] Figure 3 This is a schematic diagram of the partial three-dimensional structure of the power assembly of the present invention;

[0026] Figure 4 Schematic diagram of the three-dimensional structure of the heat conducting plate of the present invention;

[0027] Figure 5 It is a schematic diagram of the cross-sectional structure of the present invention;

[0028] Figure 6 Schematic diagram of the cross-sectional structure of the heat conducting plate of the present invention.

[0029] In the figure: 1. Shell; 2. Heat exchange assembly; 3. Power assembly; 4. Ventilation assembly; 5. Cover; 6. Clamp; 7. Primary winding; 8. Insulation sheet; 9. Magnetic core; 10. LLC converter; 11. Secondary winding; 201. Heat conduction plate; 202. Heat exchange tank; 301. Sliding pipe; 302. Limiting ring; 303. Sealing ring; 304. Magnetic ring; 305. Silicone ring; 306. Silicone one-way valve 1; 401. Upper channel; 402. Lower channel; 403. Channel cover; 404. Collecting cover; 405. Silicone one-way valve 2; 406. Air outlet. DETAILED DESCRIPTION

[0030] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0031] See also Figures 1-6 , the present invention provides a technical solution: a stable planar transformer structure with an LLC converter includes a housing 1;

[0032] The heat exchange component 2 includes a heat conducting plate 201 , and a plurality of heat exchange slots 202 are formed inside the heat conducting plate 201 ;

[0033] The power assembly 3 includes a sliding tube 301. Two limit rings 302 are fixedly sleeved on the inner wall of the sliding tube 301, and the two limit rings 302 are distributed in an upper and lower manner. A sealing ring 303 is slidably connected to the inner wall of the sliding tube 301. A magnetic ring 304 is fixedly sleeved on the inner ring surface of the sealing ring 303. A silicone ring 305 is fixedly sleeved on the inner ring surface of the magnetic ring 304. The top of the silicone ring 305 is fixedly connected to a silicone one-way valve 306. The upper and lower chambers formed by the sliding tube 301 separated by the magnetic ring 304 are in one-way communication via the silicone one-way valve 306.

[0034] The ventilation component 4 includes an upper channel 401 and a lower channel 402. The lower channel 402 and the upper channel 401 are fixedly connected to the upper and lower chambers of the slide pipe 301 respectively. A plurality of heat exchange slots 202 are fixedly connected to a collecting outer cover 404, and the collecting outer covers 404 are fixedly connected to the two opposite sides of the heat conducting plate 201 respectively. One of the collecting outer covers 404 extends out of the shell 1 and the top of the collecting outer cover 404 extending out of the shell 1 is fixedly connected with a channel outer cover 403. The channel outer cover 403 is fixedly connected to the lower channel 402. A silicone one-way valve 405 for one-way connection to the outside is provided on one side of the other collecting outer cover 404 coplanar with the shell 1, and a plurality of air outlet holes 406 connected to the outside are provided on one side of the upper channel 401 coplanar with the shell 1.

[0035] In this embodiment, Figure 1 、 Figure 2 and Figure 5 As shown, the LLC converter 10 is fixedly connected to the opposite side of the two heat conducting plates 201, and the insulating sheet 8 is fixedly connected to the opposite side of the two heat conducting plates 201, wherein the primary winding 7 is fixedly connected to the top of one of the insulating sheets 8, and the secondary winding 11 is fixedly connected to the bottom of the other insulating sheet 8. When in use, the primary winding 7 and the secondary winding 11 are connected to the circuit by extending the connection point of the housing 1. When the primary winding 7 and the secondary winding 11 are energized, the alternating current continuously switches the direction of the current, causing the magnetic ring to move up and down with the magnetic pole change of the magnetic field (like poles repel and opposite poles attract), causing the silicone one-way valve 306 and the silicone ring 305 to move up and down. The upper and lower chambers separated by the sealing ring 303, the magnetic ring 304 and the silicone ring 305 in the sliding tube 301. When the silicone one-way valve 306 moves downward, the gas passing through the lower chamber is one-way sealed by the silicone one-way valve 405, so that the pressure is increased during the downward movement. Increase, so that the gas is discharged to the upper cavity above through the silicone one-way valve 306. When moving upward, the silicone one-way valve 306 will be closed due to the negative pressure of the lower cavity and the air is transported from the outside through the silicone one-way valve 2 405 and enters the channel outer cover 403 and the collecting outer cover 404 through the heat exchange tank 202 and then replenished to the lower cavity. The magnetic ring 304, the silicone ring 305 and the silicone one-way valve 1 306 move back and forth up and down so that the external air flows through the heat exchange tank 202 to cool the primary winding, LLC converter 10 and the secondary winding 11, so that the primary winding 7, LLC converter 10 and the secondary winding 11 are not subject to the unstable performance and shortened service life caused by the heating of the coil and components. The silicone one-way valve 1 306 and the silicone one-way valve 2 405 are well-known existing technologies. Reference can be made to the baby bottle exhaust structure in the existing technology. Their structure and principle will not be elaborated in detail in this application.

[0036] In this embodiment, Figure 1 、 Figure 2and Figure 5 As shown, a clamping plate 6 is fixedly connected to the side of the secondary winding 11 opposite to the primary winding 7 , and the clamping plate 6 , the primary winding 7 , the insulating sheet 8 , the heat conducting plate 201 , the LLC converter 10 and the secondary winding 11 are all sleeved in the housing 1 .

[0037] In this embodiment, Figure 1 、 Figure 2 and Figure 5 As shown, the clamping plate 6 , the primary winding 7 , the insulating sheet 8 , the heat conducting plate 201 , the LLC converter 10 and the secondary winding 11 are internally fixedly connected with a magnetic core 9 .

[0038] In this embodiment, Figure 3 and Figure 5 As shown, the top of the sliding tube 301 is fixedly connected to the bottom of the cover plate 5, and the silicone one-way valve 306 is V-shaped.

[0039] In this embodiment, Figure 2 As shown, the insulating sheet 8 is made of alumina ceramic and is used for heat conduction and insulation. The primary winding 7 and the secondary winding 11 are both formed by a PCB and a coil embedded thereon.

[0040] In this embodiment, Figure 2 、 Figure 4 and Figure 6 As shown, the heat conducting plate 201 is composed of a heat conducting plate and a cover plate and is formed by diffusion welding, and the heat exchange groove 202 is formed by etching on the surface of the heat conducting plate.

[0041] The use method and advantages of the present invention: The stable planar transformer structure with LLC converter, when in use, works as follows:

[0042] like Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 、 Figure 5 and Figure 6As shown, when in use, the primary winding 7 and the secondary winding 11 are extended from the connection point of the shell 1 and connected to the circuit. When the primary winding 7 and the secondary winding 11 are energized, the alternating current continuously switches the direction of the current, causing the magnetic ring to move back and forth up and down with the magnetic pole change of the magnetic field (like poles repel each other and opposite poles attract each other), causing the silicone one-way valve 306 and the silicone ring 305 to move back and forth up and down. The upper and lower chambers separated by the sealing ring 303, the magnetic ring 304 and the silicone ring 305 in the sliding tube 301, when the silicone one-way valve 306 moves downward, the gas passing through the lower chamber is one-way closed by the silicone one-way valve 405, so that the pressure increases when it moves downward, causing the gas to pass through the silicone one-way valve 306 when the silicone one-way valve 306 moves downward. The one-way valve 306 is discharged to the upper cavity above. When it moves upward, the silicone one-way valve 306 will be closed due to the negative pressure of the lower cavity and the air will be transported in from the outside through the silicone one-way valve 2 405 and enter the channel outer cover 403 and the collecting outer cover 404 through the heat exchange tank 202 and then replenished into the lower cavity. The magnetic ring 304, the silicone ring 305 and the silicone one-way valve 1 306 move back and forth up and down, so that the external air flows through the heat exchange tank 202 to cool the primary winding LLC converter 10 and the secondary winding 11, so that the primary winding, the LLC converter 10 and the secondary winding 11 are not subject to the performance instability and shortened service life caused by the heat of the coils and components.

[0043] The above shows and describes the basic principles, main features and advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are merely preferred examples of the present invention and are not intended to limit the present invention. Various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention, and such changes and modifications fall within the scope of the present invention. The scope of protection claimed in the present invention is defined by the appended claims and their equivalents.

Claims

1. A stable planar transformer structure with an LLC converter, characterized in that: comprising a housing (1); A heat exchange component (2), the heat exchange component (2) comprising a heat conducting plate (201), ten heat exchange grooves (202) being provided inside the heat conducting plate (201), the heat exchange grooves (202) being made of copper metal to increase heat conduction efficiency, and the inner groove structure can increase the contact area with air and improve the heat exchange rate; A power assembly (3), the power assembly (3) comprising a sliding tube (301), two limiting rings (302) fixedly sleeved on the inner wall of the sliding tube (301), and the two limiting rings (302) are distributed up and down to prevent the sliding tube from deflecting and falling off, a sealing ring (303) is slidably connected on the inner wall of the sliding tube (301), a magnetic ring (304) is fixedly sleeved on the inner ring surface of the sealing ring (303), a silicone ring (305) is fixedly sleeved on the inner ring surface of the magnetic ring (304), and the silicone ring (305) is fixedly sleeved on the inner ring surface of the ) is fixedly connected to the top of the sliding tube (301) with a silicone one-way valve (306), and the upper and lower chambers formed by the magnetic ring (304) separated by the sliding tube (301) are connected in one direction through the silicone one-way valve (306), ensuring that when the primary winding (7) and the secondary winding (11) are supplied with alternating current and the current direction is continuously switched, the magnetic ring moves back and forth up and down with the magnetic pole change of the magnetic field, and cooperates with the silicone one-way valve (2) to repeatedly squeeze the air to perform heat exchange between the external environment and the internal environment, so that a mechanical heat dissipation effect can be achieved without additional functions; A ventilation assembly (4), the ventilation assembly (4) comprising an upper channel (401) and a lower channel (402), the lower channel (402) and the upper channel (401) being fixedly connected to the upper and lower chambers of the slide pipe (301), respectively, a plurality of the heat exchange slots (202) being fixedly connected to a collecting outer cover (404), and the collecting outer covers (404) being fixedly connected to opposite sides of the heat conducting plate (201), one of the collecting outer covers (404) extending out of the shell ( 1) and the top of the collecting outer cover (404) extending out of the shell (1) is fixedly connected to a channel outer cover (403), the channel outer cover (403) is fixedly connected to the lower channel (402), and a second silicone one-way valve (405) for one-way communication with the outside is provided on the side of the other collecting outer cover (404) coplanar with the shell (1), and a plurality of air outlet holes (406) communicating with the outside are provided on the side of the upper channel (401) coplanar with the shell (1).

2. The stable planar transformer structure with LLC converter according to claim 1, characterized in that: An LLC converter (10) is fixedly connected to one side opposite to the other of the two heat-conducting plates (201), and an insulating sheet (8) is fixedly connected to one side opposite to the other of the two heat-conducting plates (201). The top of one of the insulating sheets (8) is fixedly connected to a primary winding (7), and the bottom of the other insulating sheet (8) is fixedly connected to a secondary winding (11). The insulating sheet is an alumina ceramic insulating sheet and has both insulating and heat-conducting functions.

3. The stable planar transformer structure with LLC converter according to claim 2, characterized in that: A clamping plate (6) is fixedly connected to the side of the secondary winding (11) opposite to the primary winding (7); the clamping plate (6), the primary winding (7), the insulating sheet (8), the heat conducting plate (201), the LLC converter (10) and the secondary winding (11) are all sleeved in the housing (1).

4. The stable planar transformer structure with LLC converter according to claim 3, characterized in that: The clamping plate (6), the primary winding (7), the insulating sheet (8), the heat conducting plate (201), the LLC converter (10) and the secondary winding (11) are internally fixedly connected with a magnetic core (9). The magnetic core adopts an EI-type magnetic core, which has a compact structure and a small volume. Compared with a traditional circular magnetic core, it has a higher PCB area utilization efficiency, and its loss is negatively correlated with temperature, thereby suppressing a continuous temperature rise.

5. The stable planar transformer structure with LLC converter according to claim 1, characterized in that: The top of the sliding tube (301) is fixedly connected to the bottom of the cover plate (5), and the silicone one-way valve (306) is V-shaped. The V-shaped one-way valve can realize linear regulation of the fluid, so that the flow rate of the fluid is linearly related to the air pressure, and has good regulation performance.

6. The stable planar transformer structure with LLC converter according to claim 1, characterized in that: The heat conducting plate (201) is composed of a heat conducting plate and a cover plate and is formed by diffusion welding, and the heat exchange groove (202) is formed by etching on the surface of the heat conducting plate.

7. The stable planar transformer structure with LLC converter according to claim 3, characterized in that: The insulating sheet (8) is made of alumina ceramics and is used for heat conduction and insulation. The primary winding (7) and the secondary winding (11) are both formed by a PCB and a coil embedded thereon.

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