Stable planar transformer structure with LLC converter

Abstract

The invention relates to the technical field of planar transformers, in particular to a stable planar transformer structure with an LLC converter. The heat exchange assembly comprises a heat conduction plate, and a plurality of heat exchange grooves are formed in the heat conduction plate; and the power assembly comprises a sliding pipe, the inner wall of the sliding pipe is fixedly sleeved with two limiting rings, the two limiting rings are distributed up and down, the inner wall of the sliding pipe is slidably connected with a sealing ring, the inner ring face of the sealing ring is fixedly sleeved with a magnetic ring, and the inner ring face of the magnetic ring is fixedly sleeved with a silica gel ring. According to the stable planar transformer structure with the LLC converter, the primary winding, the LLC converter and the secondary winding are separated through the two heat conduction plates, and the heat exchange groove is communicated with the external environment, so that heat on a device is effectively eliminated through the heat conduction plates; and the conditions of unstable performance and shortened service life caused by high heat of the primary winding, the LLC converter and the secondary winding are avoided.

Description

Technical Field

[0001] The 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 commonly used in adapter power supplies.

[0003] Prior art publication number CN219225996U, isolates the LLC converter from the heat sources of the primary winding and the secondary winding through a thermal insulation film, so that the working environment of the LLC converter is stable, but the heat source still acts on the primary winding and the secondary winding, making the performance of the primary winding and the secondary winding unstable in a closed environment, and the thermal insulation is performed 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 that in the prior art proposed in the above background technology, the LLC converter is isolated from the heat source of the primary winding and the secondary winding by a thermal insulation film, so that the working environment of the LLC converter is stable, but 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, and the thermal insulation is performed 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, including 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, respectively. 2 ·K) -1 ; δ is the tube wall thickness, m; λ is the tube wall thermal conductivity, W / (m·℃).

[0010] A power assembly, the power assembly includes a sliding tube, two limiting rings are fixedly sleeved on the inner wall of the sliding tube, and the two limiting rings are distributed up and down to prevent the sliding tube from deflecting and falling off, a sealing ring is slidably connected on 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 unidirectionally connected through the silicone one-way valve to ensure that when the primary winding and the secondary winding continuously switch the current direction, 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 respectively fixedly connected to the upper and lower chambers of the slide tube, a plurality of the heat exchange slots are fixedly connected to a collecting cover and the collecting covers are respectively fixedly connected to the two sides opposite to each other of the heat conduction plate, one of the collecting covers extends out of the shell and the top of the collecting cover extending out of the shell is fixedly connected to a channel cover, the channel cover is fixedly connected to the lower channel, a silicone one-way valve 2 for one-way connection to the outside is provided on one side of the other collecting cover coplanar with the shell, and a plurality of air outlet holes connected to the outside are provided on one side of the upper channel coplanar with the shell.

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

[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, the primary winding, the insulating sheet, the heat conducting plate, the LLC converter and the secondary winding are all sleeved in the housing.

[0014] Further preferably, the clamping plate, primary winding, insulating sheet, heat conducting plate, LLC converter and secondary winding are internally fixedly connected with a magnetic core. The magnetic core adopts an EI type magnetic core, which has a compact structure and a small volume. Compared with the traditional round magnetic core, it has a higher PCB area utilization efficiency, and its loss is negatively correlated with the temperature, which inhibits the temperature from continuing to 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 regulation of the fluid, so that the flow rate of the fluid is linearly related to the air pressure, and has good regulation 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 due to 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 device can be effectively removed through the heat-conducting plates, thereby avoiding the 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 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 exchange heat 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 It is a schematic diagram of the explosion structure of the present invention;

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

[0026] Figure 4 It is a 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 It is a 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 component; 3. power component; 4. ventilation component; 5. cover plate; 6. clamping plate; 7. primary winding; 8. insulating sheet; 9. magnetic core; 10. LLC converter; 11. secondary winding; 201. heat conduction plate; 202. heat exchange slot; 301. slide pipe; 302. limit 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 be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technical personnel in this field without creative work are within the scope of protection of the present invention.

[0031] See also Figure 1-Figure 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 provided 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 up and down, 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, a silicone one-way valve 306 is fixedly connected to the top of the silicone ring 305, and the upper and lower chambers formed by the sliding tube 301 separated by the magnetic ring 304 are unidirectionally connected through 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 tube 301 respectively. A plurality of heat exchange slots 202 are fixedly connected to a collecting cover 404 and the collecting covers 404 are fixedly connected to the two opposite sides of the heat conducting plate 201 respectively. One of the collecting covers 404 extends out of the shell 1 and the top of the collecting cover 404 extending out of the shell 1 is fixedly connected to a channel cover 403. The channel 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 cover 404 coplanar with the shell 1. 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 shell 1. When the primary winding 7 and the secondary winding 11 are energized, the alternating current continuously switches the direction of the current so that the magnetic ring moves up and down with the magnetic pole change of the magnetic field (like poles repel each other and opposite poles attract each other), so that the silicone one-way valve 306 and the silicone ring 305 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 closed by the silicone one-way valve 405, so that the pressure is Increase, so that the gas is discharged to the upper cavity through the silicone one-way valve 306. When moving upward, the silicone one-way valve 306 will be closed under the influence of the negative pressure of the lower cavity and the air will be transported from the outside through the silicone one-way valve 405 and enter through the heat exchange tank 202 into the channel outer cover 403 and the collecting outer cover 404, and then replenished to the lower cavity. The magnetic ring 304, the silicone ring 305 and the silicone one-way valve 306 move up and down reciprocatingly 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 the components. The silicone one-way valve 306 and the silicone one-way valve 405 are well-known prior art, and the baby bottle exhaust structure in the prior art can be referred to. The structure and principle thereof 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 pipe 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 ceramics and is used for heat conduction and insulation, and 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 housing 1 and connected to the circuit. When the primary winding 7 and the secondary winding 11 are energized, the alternating current continuously switches the current direction so that the magnetic ring moves 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), so that the silicone one-way valve 306 and the silicone ring 305 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 slide tube 301, when the silicone one-way valve 306 moves downward, the gas passing through the lower chamber increases in pressure during the downward movement due to the one-way closure of the silicone one-way valve 405, so that the gas passes through the lower chamber when the silicone one-way valve 306 moves downward. The silicone one-way valve 306 is discharged to the upper cavity above. When it moves upward, the silicone one-way valve 306 will be closed under the influence of the negative pressure in the lower cavity and the air will be transported in from the outside through the silicone one-way valve 2 405 and enter through the heat exchange tank 202 into the channel outer cover 403 and the collecting outer cover 404 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 unstable performance and shortened service life caused by the heating of the coils and components.

[0043] The above shows and describes the basic principles, main features and advantages of the present invention. Technical personnel in this industry should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only preferred examples of the present invention and are not used to limit the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A stable planar transformer structure with LLC converter, characterized in that: It comprises 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 material 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) are 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 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), and the silicone ring (305) is fixedly sleeved on the inner ring surface of the magnetic ring (304). ) 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 sliding tube (301) separated by the magnetic ring (304) 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 connected to each other by 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 exchange heat 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 conduction plate (201), one of the collecting outer covers (404) extending out of the shell ( 1) and the top of a 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 connection to the outside is provided on the other side of the collecting outer cover (404) coplanar with the shell (1), and a plurality of air outlet holes (406) connected to the outside are provided on the side of the upper channel (401) coplanar with the shell (1).

2. A 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). A primary winding (7) is fixedly connected to the top of one of the insulating sheets (8), and a secondary winding (11) is fixedly connected to the bottom of the other insulating sheet (8). The insulating sheet is an alumina ceramic insulating sheet and has both insulating and heat-conducting functions.

3. A 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. A 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 round magnetic core, it has a higher PCB area utilization efficiency, and its loss is negatively correlated with temperature, thereby suppressing the continuous rise of temperature.

5. A 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. A 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. A 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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