LLC integrated transformer

Abstract

The LLC integrated transformer comprises a fixed plate, magnetic cores, a first coil, a second coil, a current transformer and an insulating plate, wherein the magnetic cores are respectively arranged on the fixed plate; the first coil, the second coil and the current transformer are wound on the magnetic cores; the insulating plate is used for separating the first coil from the second coil; the first coil is a high-voltage side, the second coil is a low-voltage side, and the wire outlet end of the first coil and the wire outlet section of the second coil are arranged at the two opposite ends of the fixing plate respectively. And the current transformer is sleeved on one wire outlet end of the first coil, and the wire outlet end of the current transformer penetrates through the pipe sleeve and is led to the same end of the fixing plate for fixing the wire outlet end of the second coil. According to the utility model, the two devices play roles respectively but are used as the same whole, and work together to achieve the capabilities of voltage rising and falling and current measurement, so that the occupied space of a PCB (Printed Circuit Board) is reduced, the power density is improved, the stability of the system is greatly improved, and the working efficiency is effectively improved.

Description

Technical Field

[0001] The utility model relates to the technical field of transformers, in particular to an LLC integrated transformer. Background Art

[0002] Currently, transformers and current transformers are separate, and both devices are individual entities. There are two design methods for LLC integrated transformers. One is to use 1 traditional transformer plus 1 independent inductor, but this takes up a large amount of PCB space and has a high power supply cost. The other is to wind the primary coil and the secondary coil on a double-groove bobbin respectively, but this will increase the volume of the transformer, while the current transformer has a small volume but still occupies the PCB as a separate device, making the space distribution very unreasonable.

[0003] Therefore, there are defects in the prior art and improvement is needed. Summary of the Utility Model

[0004] The technical problem to be solved by the utility model is to provide an LLC integrated transformer to solve the problems that the existing products take up a large amount of PCB space and have a high power supply cost; and the structure is not compact enough, and the power density and system stability are relatively poor.

[0005] The technical solution of the utility model is as follows: Provide an LLC integrated transformer, including: a fixing plate, a magnetic core respectively installed on the fixing plate, a first coil and a second coil wound around the magnetic core, a current transformer, and an insulating plate separating the first coil and the second coil; the first coil is the high-voltage side, the second coil is the low-voltage side, and the lead-out ends of the first coil and the lead-out segments of the second coil are respectively arranged at opposite ends of the fixing plate; the current transformer is sleeved on a lead-out end of the first coil, and the lead-out end of the current transformer passes through a bushing and is led to the same end of the fixing plate where the lead-out end of the second coil is fixed. An insulating wall is arranged between the first coil and the second coil with an insulating insulating plate to separate them as much as possible to ensure sufficient creepage distance between the high-voltage side and the low-voltage side, and at the same time, it can also prevent the first coil, the second coil and the magnetic part from interfering with each other.

[0006] The first coil, the second coil and the magnetic core form a transformer to realize the ability of AC-AC voltage step-up and step-down, while the current transformer is an instrument that measures by converting a large current on the primary side into a small current on the secondary side according to the principle of electromagnetic induction. The two devices play their respective roles but are used as a whole, working together to achieve the ability of voltage step-up and step-down and current measurement, reducing the PCB occupied space, improving the power density, greatly improving the system stability, and effectively improving the working efficiency.

[0007] Further, the LLC integrated transformer further includes: dummy pins installed on the fixing plate, and the outgoing line end of the current transformer is connected to the dummy pins. The current transformer needs to be sleeved on an outgoing line end of the high-voltage side of the main transformer, and dot bonding glue is used to firmly adhere the current transformer to the bottom plate. Its outgoing line end needs to pass through a bushing and be led to the low-voltage side of the main transformer. Since the outgoing line of the current transformer is relatively thin, the fixing plate is installed with dummy pins for hanging the line and leading it out. The outgoing line ends of all the first coil, the second coil, and the current transformer are dot bonded with glue and led out from the fixing plate. After the glue is baked, it can provide support and fixed connection for the components.

[0008] Further, the magnetic core includes: a central magnetic rod, an upper connecting magnetic plate and a lower connecting magnetic plate respectively connected to both ends of the central magnetic rod, a left magnetic plate and a right magnetic plate respectively connected to the upper connecting magnetic plate and the lower connecting magnetic plate; the first coil and the second coil are wound around the central magnetic rod, and the insulating plate is sleeved on the central magnetic rod.

[0009] Further, the upper connecting magnetic plate and the lower connecting magnetic plate are funnel-shaped.

[0010] Further, the fixing plate is provided with an installation window, and the magnetic core is installed at the installation window.

[0011] Further, the current transformer includes: a magnetic ring, and a third coil wound around the magnetic ring.

[0012] Further, the insulating plate is an epoxy resin plate.

[0013] Further, the outer surfaces of the magnetic core, the first coil, the second coil, and the current transformer are all wrapped with insulating tape. In order to ensure the insulation performance of the LLC integrated transformer, high-temperature film-coated wire is used for the transformer wire, and all the incoming and outgoing wires of the device are protected with bushings. The whole device is vacuum impregnated and dried with insulating oil, and the surface of the magnetic core is wrapped with insulating tape. These measures can ensure the reliability and safety regulations requirements of the LLC integrated transformer.

[0014] Adopting the above scheme, the present utility model provides an LLC integrated transformer, which has the following technical effects:

[0015] (1). It reduces the volume of the power supply device and the occupied space of the PCB, can make the power supply device lightweight, has a simple and clear structure, has the advantages of high efficiency and low cost, and reduces the power supply cost; the device with a compact structure has better integration, better adaptability and reliability, and has greater market potential;

[0016] (2). The power density of the integrated transformer is higher than that of the traditional coil transformer. It can reduce the volume of the components and improve the overall efficiency of the system while maintaining the same power output. Brief Description of the Drawings

[0017] Figure 1 It is a schematic structural diagram of an embodiment of the present utility model;

[0018] Figure 2 is Figure 1 a schematic structural diagram of another perspective of the embodiment;

[0019] Figure 3 is a schematic structural diagram of the magnetic core. Detailed Description of the Preferred Embodiment

[0020] The present utility model will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0021] Please refer to Figures 1 - 3 , the present utility model provides an LLC integrated transformer, including: a fixing plate 10, a magnetic core respectively installed on the fixing plate 10, a first coil 11 and a second coil 12 wound around the magnetic core, a current transformer 13, and an insulating plate 14 separating the first coil 11 and the second coil 12; the first coil 11 is the high-voltage side, the second coil 12 is the low-voltage side, and the outgoing line ends of the first coil 11 and the outgoing line segments of the second coil 12 are respectively arranged at opposite ends of the fixing plate 10; the current transformer 13 is sleeved on an outgoing line end of the first coil 11, and the outgoing line end of the current transformer 13 passes through a bushing 21 and is led to the same end of the fixing plate 10 where the outgoing line end of the second coil 12 is fixed. An insulating wall is arranged between the first coil 11 and the second coil 12 with the insulating plate 14 to separate them as much as possible to ensure sufficient creepage distance between the high-voltage and low-voltage sides, and at the same time, it can also prevent the first coil 11, the second coil 12 and the magnetic components from interfering with each other. The fixing plate 10 adopts the base material of a PCB board.

[0022] The first coil 11, the second coil 12 and the magnetic core form a transformer to realize the ability of AC-AC voltage step-up and step-down, and the current transformer 13 is an instrument that measures by converting a large current on the primary side into a small current on the secondary side according to the principle of electromagnetic induction. The two devices play their respective roles but are used as a whole, working together to achieve the ability of voltage step-up and step-down and current measurement, reducing the occupied space of the PCB while also improving the power density, greatly improving the stability of the system, and effectively improving the working efficiency.

[0023] In this embodiment, the LLC integrated transformer further includes: dummy pins 20 installed on the fixed plate 10, and the outgoing line end of the current transformer 13 is connected to the dummy pins 20. The current transformer 13 needs to be sleeved on an outgoing line end of the high-voltage side of the main transformer, and spot-bonding glue is used to firmly bond the current transformer 13 to the bottom plate, while its outgoing line end needs to pass through a bushing and lead to the low-voltage side of the main transformer. Since the outgoing line of the current transformer 13 is relatively thin, the fixed plate is installed with dummy pins for hanging the line and leading it out. The outgoing line ends of all the first coil 11, the second coil 12, and the current transformer 13 are spot-bonded with glue and led out from the fixed plate. After the colloid is baked, it can provide support and fixed connection for the components.

[0024] In this embodiment, the magnetic core includes: a central magnetic rod 15, an upper connecting magnetic plate 16 and a lower connecting magnetic plate 17 respectively connected to both ends of the central magnetic rod 15, and a left magnetic plate 18 and a right magnetic plate 19 respectively connected to the upper connecting magnetic plate 16 and the lower connecting magnetic plate 17; the first coil 11 and the second coil 12 are wound around the central magnetic rod 15, and the insulating plate 14 is sleeved on the central magnetic rod 15.

[0025] In this embodiment, the upper connecting magnetic plate 16 and the lower connecting magnetic plate 17 are funnel-shaped.

[0026] In this embodiment, the fixed plate 10 is provided with an installation window, and the magnetic core is installed at the installation window.

[0027] In this embodiment, the current transformer 13 includes: a magnetic ring and a third coil wound around the magnetic ring.

[0028] In this embodiment, the insulating plate 14 is an epoxy resin plate.

[0029] In this embodiment, the outer surfaces of the magnetic core, the first coil 11, the second coil 12, and the current transformer are all wrapped with insulating tape. In order to ensure the insulation performance of the LLC integrated transformer, high-temperature film-coated wire is used for the transformer wire, and all the incoming and outgoing wires of the device are protected with bushings. The whole device is vacuum impregnated and dried with insulating oil, and the surface of the magnetic core is wrapped with insulating tape. These measures can all ensure the reliability and safety regulations requirements of the LLC integrated transformer.

[0030] In summary, the present invention provides an LLC integrated transformer, having the following technical effects:

[0031] (1). Reduce the volume of the power supply device and the occupied space of the PCB, which can make the power supply device lighter, with a simple and clear structure, having the advantages of high efficiency and low cost, and reducing the power supply cost; the compact device has better integration, better adaptability and reliability, and has greater market potential;

[0032] (2) The power density of the integrated transformer is higher than that of the traditional coil transformer. It can reduce the volume of components and improve the overall efficiency of the system while maintaining the same power output.

[0033] The above are only the preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. An LLC integrated transformer, characterized in that, Comprising: A fixed plate, magnetic cores respectively installed on the fixed plate, a first coil and a second coil wound around the magnetic cores, a current transformer, and an insulating plate separating the first coil and the second coil; the first coil is the high-voltage side, the second coil is the low-voltage side, the lead-out ends of the first coil and the lead-out segments of the second coil are respectively arranged at opposite ends of the fixed plate; the current transformer is sleeved on one lead-out end of the first coil, and the lead-out end of the current transformer passes through a bushing and is led to the same end of the fixed plate where the lead-out end of the second coil is fixed.

2. The LLC integrated transformer according to claim 1, characterized in that, Further comprising: False feet installed on the fixed plate, and the lead-out end of the current transformer is connected to the false feet.

3. The LLC integrated transformer according to claim 1, characterized in that, The magnetic core comprises: a central magnetic rod, an upper connecting magnetic plate and a lower connecting magnetic plate respectively connected to both ends of the central magnetic rod, a left magnetic plate and a right magnetic plate respectively connected to the upper connecting magnetic plate and the lower connecting magnetic plate; the first coil and the second coil are wound around the central magnetic rod, and the insulating plate is sleeved on the central magnetic rod.

4. An LLC integrated transformer according to claim 3, characterized in that, The upper connecting magnetic plate and the lower connecting magnetic plate are funnel-shaped.

5. The LLC integrated transformer according to claim 1, wherein The fixed plate is provided with an installation window, and the magnetic core is installed at the installation window.

6. The LLC integrated transformer according to claim 1, wherein The current transformer comprises: a magnetic ring, and a third coil wound around the magnetic ring.

7. An LLC integrated transformer according to claim 1, characterized in that, The insulating plate is an epoxy resin plate.

8. An LLC integrated transformer according to claim 1, characterized in that, The outer surfaces of the magnetic core, the first coil, the second coil, and the current transformer are all wrapped with insulating tape.

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