Power hybrid integrated DC / DC converter packaging structure

Abstract

The utility model relates to a packaging structure of a power hybrid integrated DC / DC converter. The packaging structure comprises a metal shell with an opening on one side; a cover plate; the power board is arranged in the shell and attached to the bottom of the shell, a controlled end of a control switch on the power board is connected with a signal chip of the signal board through a first contact pin so as to receive a control signal from the signal board, and a bonding pad on the power board is connected with a bonding pad of the transformer board through a second contact pin so as to receive the control signal from the signal board. A voltage signal is received from the transformer; the transformer board is arranged in the shell, is positioned above the power board and is used for converting voltage; the signal board is arranged in the shell, located above the transformer board and used for transmitting control signals, the signal board is of a double-face wiring structure, and electronic components are evenly distributed on the double faces of the signal board. By adopting the power hybrid integrated DC / DC converter packaging structure of the utility model, the assembly density of components in a DC / DC converter circuit can be improved, and the product packaging size can be reduced.

Description

Technical Field

[0001] The utility model generally relates to the field of packaging technology, and more specifically, relates to a power hybrid integrated DC / DC converter packaging structure. Background Art

[0002] A DC / DC converter (DC-DC converter) is an electronic power supply component used to convert a DC voltage into another DC voltage. In an electronic device, since different circuit modules may require different voltage levels to work, a DC / DC converter is required, so DC / DC converters are very common in electronic devices. DC / DC converters have broad market prospects and application space in high-reliability fields such as national defense and oil drilling.

[0003] The power module of the DC / DC converter usually has a large operating current and generates a lot of heat. If it cannot be transferred to the outside world in time, the internal temperature of the module will rise, and the internal chip will work in a high temperature environment for a long time.

[0004] The existing packaging structure of the DC / DC converter is to integrate the entire circuit of the DC / DC converter on a circuit board, and place the circuit board inside a metal shell, with the bottom surface of the circuit board close to the bottom surface of the metal shell. There are problems such as high assembly difficulty, low installation density of electronic components, difficulty in rework, debugging and disassembly, and low heat dissipation efficiency. Utility Model Content

[0005] In order to solve one or more of the above technical problems, the present invention provides solutions in the following aspects.

[0006] In a first aspect, the utility model provides a power hybrid integrated DC / DC converter packaging structure, comprising:

[0007] A metal shell with an opening on one side, used to accommodate a power board, a signal board and a transformer board of a DC / DC converter, and a through hole for connecting the power board and an external circuit is provided at the bottom of the metal shell;

[0008] a cover plate, covering the opening to seal the metal housing;

[0009] A power board is placed in the housing and attached to the bottom of the housing, a controlled end of a control switch on the power board is connected to a signal chip of the signal board through a first pin so as to receive a control signal from the signal board, and a pad on the power board is connected to a pad on the transformer board through a second pin so as to receive a voltage signal from the transformer;

[0010] A transformer board, disposed in the housing and above the power board, for converting voltage;

[0011] The signal board is placed in the housing and above the transformer board, and is used to transmit control signals. The signal board has a double-sided wiring structure and electronic components are evenly distributed on both sides.

[0012] In one embodiment, it further includes an insulating sleeve and a shell pin, wherein the insulating sleeve passes through the through hole, and the shell pin passes through the insulating sleeve to be connected to a solder pad at the bottom of the power board.

[0013] In one embodiment, chip bonding wires are disposed on both the power board and the signal board.

[0014] In one embodiment, the lower side of the transformer core of the transformer board is adhered to the substrate of the power board.

[0015] In one embodiment, four corners inside the metal shell are provided with support parts for preventing the signal board from moving, and the signal board is detachably connected to the support parts.

[0016] In one embodiment, the support portion is provided with threads, and the signal board is threadedly connected to the support portion via M1 screws.

[0017] In one embodiment, a through hole is formed on the transformer board for the pins connecting the signal board and the power board to pass through.

[0018] In one embodiment, the cover plate is fixed to the housing by means of parallel welds.

[0019] In one embodiment, the metal shell is a groove with an opening on one side.

[0020] The technical effect part mainly describes the effect, and tries not to describe the content of the claim.

[0021] The DC / DC converter packaging structure in the prior art integrates the power board, signal board and transformer board on a circuit board, and attaches the entire circuit board to the bottom of the shell, resulting in low space utilization of the circuit board and low assembly density of components, which in turn leads to excessive size of the DC / DC converter product. The power hybrid integrated DC / DC converter packaging structure of the utility model splits the entire DC / DC converter circuit board into a power board, a signal board and a transformer board, and arranges them in layers inside the shell to form a stacked board frame, and enables the signal board to adopt a double-sided wiring structure, thereby improving the assembly density of components in the DC / DC converter circuit and reducing the product packaging size. In addition, by attaching the power board to the bottom of the metal shell, it helps to dissipate heat from the power board.

[0022] Furthermore, by providing the housing pins, it is convenient to connect the output end of the power board to the external circuit, thereby supplying power to the external circuit. By providing the insulating sleeve, the metal housing is prevented from being charged, thereby ensuring the insulation performance of the metal housing.

[0023] Furthermore, since the transformer core is a high-power device, by sticking the lower side of the transformer core to the substrate of the power board, the heat dissipation efficiency of the transformer core can be increased, preventing the transformer board from overheating and causing failure; in addition, the substrate of the power board can provide vertical support force for the transformer board and fix the position of the transformer board.

[0024] Furthermore, by detachably connecting the signal board to the support portion, the signal board can be fixed inside the metal housing, thereby ensuring the stability of the overall structure of the DC / DC converter; and when the DC / DC converter fails, it is easy to disassemble and repair it. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] By reading the detailed description below with reference to the accompanying drawings, the above and other purposes, features and advantages of the exemplary embodiments of the present invention will become easy to understand. In the accompanying drawings, several embodiments of the present invention are shown in an exemplary and non-limiting manner, and the same or corresponding reference numerals represent the same or corresponding parts, wherein:

[0026] Figure 1 This is a front view of the packaging structure of the power hybrid integrated DC / DC converter of the utility model;

[0027] Figure 2 It is a top view of the packaging structure of the power hybrid integrated DC / DC converter of the utility model;

[0028] Figure 3 It is a bottom view of the packaging structure of the power hybrid integrated DC / DC converter of the utility model. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the utility model.

[0030] The specific implementation of the utility model is described in detail below with reference to the accompanying drawings.

[0031] Power hybrid integrated DC / DC converter packaging structure embodiment:

[0032] like Figures 1 to 3As shown, the power hybrid integrated DC / DC converter packaging structure of the utility model comprises: a metal shell 1 with an opening on one side, which is used to accommodate a power board 3, a signal board 4 and a transformer board 10 of the DC / DC converter, and a through hole for connecting the power board and an external circuit is opened at the bottom of the metal shell; a cover plate 5, which covers the opening to seal the metal shell; a power board, which is placed in the shell and attached to the bottom of the shell, and a controlled end of a control switch on the power board is connected to a signal chip of the signal board through a first pin 25 to receive a control signal from the signal board, and a pad on the power board is connected to a pad of the transformer board through a second pin 26 to receive a voltage signal from the transformer; a transformer board, which is placed in the shell and located above the power board, and is used to convert the voltage; a signal board, which is placed in the shell and located above the transformer board, and is used to transmit the control signal, and the signal board is a double-sided wiring structure and electronic components are evenly distributed on both sides.

[0033] The power board, signal board and transformer board are conventional circuit modules of the DC / DC converter. The innovation of the present invention lies in the packaging structure rather than the specific circuit structure. Those skilled in the art should know that the electronic components installed on the power board include chip components 23, integrated circuit bare chips 11 and magnetic components. The chip components include resistors and capacitors. The integrated circuit bare chips include power devices and signal chips. The magnetic components include inductors, transformers, Hall sensors and other components.

[0034] The electronic components installed on the signal board include chip components (resistors, capacitors) and integrated circuit bare chips (mainly signal devices).

[0035] The power board is double-sided, with chip components, integrated circuit bare chips and magnetic components placed on the front, and the back is the welding surface with gold-plated metal pads.

[0036] Double-sided wiring is a printed circuit board design and manufacturing technology that allows the circuit paths to be distributed not only on one side of the circuit board, but also on the other side. This design allows for a more compact layout and higher circuit density, while also providing better thermal management and electromagnetic compatibility.

[0037] Chip components refer to electronic components manufactured in the form of chips. They are usually made of semiconductor materials, but can also be made of other materials such as ceramics or metals. Chip components have the characteristics of small size, light weight, easy installation and stable electrical performance, and are widely used in various electronic devices.

[0038] Integrated circuit bare chips, also known as wafers or semiconductor bare chips, are key products in the semiconductor manufacturing process. They are thin slices made of silicon or other semiconductor materials, containing hundreds of millions of tiny electronic components - transistors, which are integrated on the chip through complex processes such as lithography, etching and doping.

[0039] The substrates of the signal board and the power board are both made of ceramic material. The transformer board is made of PCB.

[0040] The pads in this embodiment are all metal pads, which are the parts where the electronic components are connected to the substrate of the circuit board. Through the welding process, the pins of the electronic components form an electrical connection with the metal coating on the pads to ensure the connectivity of the circuit.

[0041] The assembly sequence of the power hybrid integrated DC / DC converter packaging structure of the utility model is as follows:

[0042] S1. Clean the substrate of the signal board, the substrate of the signal board and the substrate of the transformer board respectively, protect the bonding area, and solder the components.

[0043] Bonding area refers to the area used to weld or bond metal or other conductive materials to the silicon wafer during semiconductor manufacturing. These bonding areas are used to form the leads, pins, or pads of the chip to connect the chip's electrodes to the circuit outside the package.

[0044] S2. Perform die bonding and chip pasting on the power board and signal board.

[0045] S3. Place the signal board, transformer board and power board into the corresponding positions in the housing and fix them.

[0046] S4. Install the first pin and the second pin, and solder the pins.

[0047] S5. Test the DC / DC converter, and after the test, clean, bake, and cap it.

[0048] The DC / DC converter packaging structure in the prior art integrates the power board, signal board and transformer board on a circuit board, and attaches the entire circuit board to the bottom of the shell, resulting in low space utilization of the circuit board and low assembly density of components, which in turn leads to excessive size of the DC / DC converter product. The power hybrid integrated DC / DC converter packaging structure of the utility model splits the entire DC / DC converter circuit board into a power board, a signal board and a transformer board, and arranges them in layers inside the shell to form a stacked board frame, and enables the signal board to adopt a double-sided wiring structure, thereby improving the assembly density of components in the DC / DC converter circuit and reducing the product packaging size. In addition, by attaching the power board to the bottom of the metal shell, it helps to dissipate heat from the power board.

[0049] In one embodiment, an insulating sleeve 8 and a shell pin are further included. The insulating sleeve passes through the through hole, and the shell pin passes through the insulating sleeve to connect with the pad at the bottom of the power board.

[0050] In this embodiment, there are 8 shell pins, namely the first shell pin 2, the second shell pin 16, the third shell pin 17, the fourth shell pin 18, the fifth shell pin 19, the sixth shell pin 20, the seventh shell pin 21, and the eighth shell pin 22.

[0051] By providing the shell pins, it is convenient to connect the output end of the power board to the external circuit, so as to supply power to the external circuit. By providing the insulating sleeve, the metal shell is prevented from being charged, thereby ensuring the insulation performance of the metal shell.

[0052] In one embodiment, the power board is provided with a chip bonding wire 12 , and the signal board is also provided with a chip bonding wire.

[0053] In one embodiment, the lower side of the transformer core 9 of the transformer board is adhered to the substrate of the power board.

[0054] No components are installed at the position where the substrate of the power board and the transformer core are opposite to each other, and the lower side of the transformer core can be pasted on the substrate of the power board, and adhesive can be used for pasting.

[0055] Since the transformer core is a high-power device, by sticking the lower side of the transformer core to the substrate of the power board, the heat dissipation efficiency of the transformer core can be increased, preventing the transformer board from overheating and causing failure; in addition, the substrate of the power board can provide vertical support force for the transformer board and fix the position of the transformer board.

[0056] In one embodiment, four corners inside the metal shell are provided with support parts for preventing the signal board from moving, and the signal board is detachably connected to the support parts.

[0057] By detachably connecting the signal board to the support portion, the signal board can be fixed inside the metal shell, thereby ensuring the stability of the overall structure of the DC / DC converter; and when the DC / DC converter fails, it is easy to disassemble and repair it.

[0058] In one embodiment, the support portion is provided with threads, and the signal board is threadedly connected to the support portion via M1 screws.

[0059] In this embodiment, four M1 screws are used to fix the four corners of the signal board on the four supporting parts respectively. The four M1 screws are a first M1 screw 14 , a second M1 screw 15 , a third M1 screw 6 and a fourth M1 screw 13 .

[0060] In one embodiment, a through hole is formed on the transformer board for the pins connecting the signal board and the power board to pass through.

[0061] In this embodiment, the insulating sleeve 8 may be a glass insulator, and other insulating components may also be used in other embodiments.

[0062] In one embodiment, the cover plate is fixed to the housing by means of parallel welds.

[0063] By fixing it to the casing using parallel welds, the airtightness of the entire DC / DC converter can be guaranteed.

[0064] In one embodiment, the metal shell is a groove with an opening on one side.

[0065] In the above description of this specification, unless otherwise clearly specified and limited, the terms "fixed", "installed", "connected" or "connected" should be understood in a broad sense. For example, with regard to the term "connection", it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal connection of two elements or the interaction relationship between two elements. Therefore, unless otherwise clearly defined in this specification, those skilled in the art can understand the specific meanings of the above terms in this utility model according to the specific circumstances.

[0066] According to the above description of this specification, those skilled in the art may also understand that the terms used below, such as "up", "down", "front", "back", "left", "right", "length", "width", "thickness", "vertical", "horizontal", "top", "bottom", "inside", "outside", "axial", "radial", "circumferential", "center", "longitudinal", "lateral", "clockwise" or "counterclockwise", etc., which indicate the orientation or position relationship, are based on the orientation or position relationship shown in the drawings of this specification, and are only for the purpose of facilitating the explanation of the scheme of the utility model and simplifying the description, rather than explicitly or implicitly indicating that the device or element involved must have the specific orientation, be constructed and operate in a specific orientation. Therefore, the above-mentioned orientation or position relationship terms cannot be understood or interpreted as limitations on the scheme of the utility model.

[0067] In addition, the terms "first" or "second" used in this specification to refer to numbers or ordinals are only used for descriptive purposes and cannot be understood as explicitly or implicitly indicating relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of this specification, the meaning of "plurality" is at least two, such as two, three or more, etc., unless otherwise clearly and specifically defined.

[0068] Although this specification has shown and described a plurality of embodiments of the utility model, it is obvious to those skilled in the art that such embodiments are provided by way of example only. Those skilled in the art will think of many changes, modifications and alternatives without departing from the idea and spirit of the utility model. It should be understood that in the process of practicing the utility model, various alternatives to the embodiments of the utility model described herein may be adopted.

Claims

1. A power hybrid integrated DC / DC converter packaging structure, characterized in that: include: A metal shell with an opening on one side, used to accommodate a power board, a signal board and a transformer board of a DC / DC converter, and a through hole for connecting the power board and an external circuit is provided at the bottom of the metal shell; a cover plate, covering the opening to seal the metal housing; A power board is placed in the housing and attached to the bottom of the housing, a controlled end of a control switch on the power board is connected to a signal chip of the signal board through a first pin so as to receive a control signal from the signal board, and a pad on the power board is connected to a pad on the transformer board through a second pin so as to receive a voltage signal from the transformer; A transformer board, disposed in the housing and above the power board, for converting voltage; The signal board is placed in the housing and above the transformer board, and is used to transmit control signals. The signal board has a double-sided wiring structure and electronic components are evenly distributed on both sides.

2. The power hybrid integrated DC / DC converter packaging structure according to claim 1, characterized in that: It also includes an insulating sleeve and a shell pin, the insulating sleeve passes through the through hole, and the shell pin passes through the insulating sleeve and is connected to the welding pad at the bottom of the power board.

3. The power hybrid integrated DC / DC converter packaging structure according to claim 1, characterized in that: Chip bonding wires are arranged on the power board and the signal board.

4. The power hybrid integrated DC / DC converter packaging structure according to claim 1, characterized in that: The lower side of the transformer core of the transformer board is adhered to the substrate of the power board.

5. The power hybrid integrated DC / DC converter packaging structure according to any one of claims 1 to 4, characterized in that: Supporting parts for preventing the signal board from moving are arranged at four corners inside the metal shell, and the signal board is detachably connected to the supporting parts.

6. The power hybrid integrated DC / DC converter packaging structure according to claim 5, characterized in that: The support portion is provided with threads, and the signal plate is threadedly connected to the support portion via M1 screws.

7. The power hybrid integrated DC / DC converter packaging structure according to claim 6, characterized in that: The transformer board is provided with through holes for pins connecting the signal board and the power board to pass through.

8. The power hybrid integrated DC / DC converter packaging structure according to claim 7, characterized in that: The cover plate is fixed to the shell by means of parallel welds.

9. The power hybrid integrated DC / DC converter packaging structure according to claim 8, characterized in that: The metal shell is a groove with an opening on one side.

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