Anti-interference power supply

Abstract

The invention discloses an anti-interference power supply which comprises a shell and further comprises a power amplifier assembly which is arranged in the shell and used for power management and comprises a printed board and a plurality of electrical elements located on the back face of the printed board. The back surface of the printed board is opposite to one inner wall of the shell; the conductive part is arranged between the back surface of the printed board and the inner wall of the shell, and the projection shape of the conductive part on a projection surface parallel to the extending direction of the printed board covers the electrical elements on the back surface of the printed board; the conductive piece is electrically connected with a reference point with a ground potential in the power amplifier assembly; and a reference point with a ground potential in the power amplifier assembly is electrically connected with the shell through a safety device. The anti-interference power supply can reduce the power failure probability of the power supply.

Description

Technical Field

[0001] The invention relates to the technical field of power supply equipment, and in particular to an anti-interference power supply. Background Art

[0002] In a relatively harsh external working environment, the SMD devices on the power amplifier board inside the power module of the electrical equipment are prone to dust accumulation, resulting in a decrease in electrical performance or even damage. To solve this problem, the SMD devices are placed on the back of the printed circuit board. At this time, the SMD devices are located between the printed circuit board and the shell sheet metal of the power module. The printed circuit board and the shell sheet metal will protect the SMD devices and reduce dust accumulation on the SMD devices. However, in actual use, compared with the configuration where the SMD devices are placed on the front of the printed circuit board, placing the SMD devices on the back of the printed circuit board increases the probability of power failure of the power module. Summary of the invention

[0003] The purpose of the present invention is to overcome the above-mentioned defects or problems existing in the background technology and provide an anti-interference power supply, which can reduce the probability of power failure.

[0004] To achieve the above object, the present invention adopts the following technical solutions:

[0005] Technical solution 1: An anti-interference power supply includes a shell, which also includes: a power amplifier component, which is placed in the shell and used for power management, and includes a printed circuit board and a plurality of electrical components located on the back of the printed circuit board; the back of the printed circuit board is opposite to an inner wall of the shell; and a conductive member, which is placed between the back of the printed circuit board and the inner wall of the shell, and the projection shape on the projection plane parallel to the extension direction of the printed circuit board covers the electrical components located on the back of the printed circuit board; the conductive member is electrically connected to a reference point with ground potential in the power amplifier component; the reference point with ground potential in the power amplifier component is electrically connected to the shell through a safety device.

[0006] Technical solution 2 based on technical solution 1: In the power amplifier component, a power module and a control module are also provided on the printed circuit board, the power module is used for power conversion, and the control module is used for controlling the power module; the projection shape of the conductive part on the projection surface covers the power module and the control module.

[0007] Technical solution three based on technical solution two: the conductive part includes a first conductive part corresponding to the position of the power module, and a second conductive part corresponding to the position of the control module, and the first conductive part and the second conductive part are electrically isolated in the conductive part; the first conductive part is electrically connected to a reference point with ground potential in the power module, and the second conductive part is electrically connected to a reference point with ground potential in the control module.

[0008] Technical solution four based on technical solution three: also includes an electrical connector, one end of which is electrically connected to the side edge of the conductive member, and the other end of which is electrically connected to a reference point with ground potential in the power amplifier component.

[0009] Technical solution 5 based on technical solutions 1 to 4: the conductive part is located between the printed circuit board and the shell, further away from the printed circuit board.

[0010] Technical solution six based on technical solution five: the conductive member includes a metal foil for forming the first conductive part and the second conductive part.

[0011] Technical solution seven based on technical solution six: the conductive member adopts a flexible circuit board, and the metal foil is a conductor layer in the flexible circuit board.

[0012] Technical Solution 8 based on Technical Solution 7: The power amplifier assembly also includes a plurality of electrical components located on the front side of the printed circuit board, and the type of the electrical components located on the front side of the printed circuit board is a weak-electric signal device, and the type of the electrical components located on the back side of the printed circuit board is a strong-electric signal device.

[0013] Technical solution nine based on technical solution eight: In the power amplifier assembly, the electrical components located on the front side of the printed circuit board are fixed by glue dispensing.

[0014] Technical solution 10 based on technical solutions 6 to 9: resin material is filled between the power amplifier component, the conductive part and the shell to fix the conductive part.

[0015] It can be seen from the above description of the present invention that, compared with the prior art, the present invention has the following beneficial effects:

[0016] Technical solution 1 provides an anti-interference power supply, which reduces the probability of power failure when the electrical components are placed on the back of the printed circuit board.

[0017] After research, the applicant found that in the existing power supply structure, the printed circuit board and the sheet metal shell are usually connected through a safety device to form a loop, and the safety device is usually a Y capacitor. Specifically, in order to suppress common-mode interference and achieve a better safety effect, the art usually considers transferring the interference generated by the power amplifier component itself to the ground through the printed circuit board, so the ground potential reference point (reference ground) of the printed circuit board is connected to the sheet metal shell through a Y capacitor and then to the ground. Therefore, in this field, it is generally believed that safety devices are beneficial to solving the overall interference problem of power supply equipment. However, the applicant also found that when the electrical components are placed on the back of the printed circuit board in the present application, it is precisely because of the presence of the safety device that the probability of power failure is increased.

[0018] Specifically, placing electrical components on the back of a printed circuit board increases the probability of power outages. The reason is that, compared to placing electrical components on the front of a printed circuit board, placing electrical components on the back of a printed circuit board will make the distance between the electrical components and the sheet metal shell too close. When powered on, the electrical components and the sheet metal shell form a large parasitic capacitance. In a high-power power supply device, the external power supply (such as the power grid) will interfere with the sheet metal shell connected to the ground and reversely import power from the sheet metal shell. This interference will be fed back to the electrical components through this parasitic capacitance, and then form a loop through the safety devices between the printed circuit board and the sheet metal shell, interfering with the drive and control of the electrical components, thereby affecting the entire power supply. In the technical solution, a conductive member is arranged between the power amplifier assembly and the shell, the conductive member covers the electrical components on the back of the printed circuit board in the power amplifier assembly, and the conductive member is directly electrically connected to the reference point with ground potential in the power amplifier assembly. When power is turned on, parasitic capacitance will be formed between the conductive member and the sheet metal shell, and between the conductive member and the electrical components. However, compared with the parasitic capacitance formed between the electrical components and the shell when the conductive member is not arranged, since the distance between the conductive member and the shell and the electrical components is smaller, and the area of ​​the conductive member is larger, the capacitance of the two parasitic capacitances formed at this time is larger. When the interference of the sheet metal shell forms a loop, due to the larger capacitance and smaller impedance, this interference will directly enter the reference point with ground potential on the printed circuit board through the conductive member, and then return to the shell through the safety device formed between the ground potential reference point on the printed circuit board and the sheet metal shell, thus bypassing the electrical components, so that the electrical components are less interfered, and the impact on the electrical components is reduced, which also reduces the impact on the entire power supply and reduces the probability of power failure.

[0019] In technical solution two, the power amplifier assembly is provided with a power module and a control module with corresponding functions on the printed circuit board. The components corresponding to the power module and the control module can be arranged on the front and back of the printed circuit board. At the same time, the projection shape of the conductive part covers the power module and the control module, so that the conductive part can protect the power module and the control module that are easily affected by interference, thereby improving the overall anti-interference performance of the power supply.

[0020] In technical solution three, the conductive part is divided into a first conductive part and a second conductive part according to the corresponding manner to the power module and the control module. The two conductive parts are respectively connected to the corresponding reference points with ground potential in the power module and the control module. The interference of the shell is dispersed to different positions of the power amplifier components through these two paths, and then fed back to the shell through the capacitor device, thereby reducing the impact of the interference on the components on the printed circuit board. Compared with the non-division case, this technical solution reduces the electromagnetic interference caused by the shared grounding path between the power module and the control module through physical electrical isolation and independent feedback paths, thereby improving the overall anti-interference performance of the power supply.

[0021] In technical solution four, an electrical connector is provided to ensure a stable electrical connection between the conductive member and the power amplifier assembly, and the electrical connector is provided at the side edge of the conductive member. When the distance between the conductive member and the printed circuit board is very close, the electrical connector can easily form a connection between the power amplifier assembly and the conductive member.

[0022] In technical solution five, the conductive part is farther away from the printed board, that is, the conductive part is closer to the shell, which makes the parasitic capacitance formed between the conductive part and the shell larger and the impedance lower, and the interference is easier to pass through the conductive part, thereby reducing the impact on the components on the printed board; and, the conductive part is farther away from the printed board, and the electromagnetic coupling between the conductive part and the printed board will also be weakened, thereby reducing the electromagnetic interference of the conductive part on the printed board.

[0023] In technical solution six, the conductive part includes a metal foil, which has an extremely small thickness and is soft and deformable. When the distance between the printed circuit board and the shell is very small, the metal foil can be conveniently arranged between the printed circuit board and the shell, and form a certain distance between the printed circuit board and the shell.

[0024] In Technical Solution 7, the conductive part uses a flexible circuit board, and the conductive layer of the flexible circuit board uses metal foil. At the same time, film layers are arranged above and below the conductive layer. The thickness of the flexible circuit board is also extremely low, and it can be conveniently arranged between the printed circuit board and the shell. The conductive layer plays a conductive role, and the film layer can protect the conductive layer to prevent the conductive layer from wear and failure.

[0025] In Technical Solution Eight, in addition to arranging electrical components on the back of the printed circuit board, electrical components can also be arranged on the front of the printed circuit board. Since the distance between the electrical components on the front of the printed circuit board and the shell is larger, external interference has less interference on the electrical components on the front of the printed circuit board; and the electrical components on the front of the printed circuit board are weak-electric signal devices, and the electrical components on the back of the printed circuit board are strong-electric signal devices. Weak-electric signal devices are easily affected by external interference, while strong-electric signal devices are less affected by external interference. Therefore, placing the weak-electric signal devices on the front of the printed circuit board can further reduce the overall impact on the power amplifier components.

[0026] In technical solution nine, the electrical components located on the front side of the printed circuit board are fixed by glue dispensing to enhance the installation firmness of these electrical components.

[0027] In Technical Solution 10, the conductive parts are fixed by filling resin materials to prevent displacement of the conductive parts and avoid contact between the conductive parts and the printed circuit board and the housing. At the same time, the resin material itself has good electrical insulation properties and can prevent electrical short circuits or leakage. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0029] Figure 1 A schematic side view of a partial structure of an anti-interference power supply provided by an embodiment of the present invention;

[0030] Figure 2 for Figure 1 Schematic diagram of the structure of the conductive parts.

[0031] Description of main reference numerals:

[0032] Amplifier assembly 1; housing 2; printed circuit board 3; electrical component 4; conductive part 5; safety device 6; first conductive part 7; second conductive part 8; electrical connector 9. DETAILED DESCRIPTION

[0033] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are preferred embodiments of the present invention and should not be regarded as excluding other embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0034] In the claims, description and the above-mentioned drawings of the present invention, unless otherwise clearly defined, the use of terms such as "first", "second" or "third" etc. are for distinguishing different objects rather than for describing a specific order.

[0035] In the claims, specification and the above-mentioned drawings of the present invention, unless otherwise explicitly defined, directional words, such as the terms "center", "lateral", "longitudinal", "horizontal", "vertical", "top", "bottom", "inside", "outside", "up", "down", "front", "back", "left", "right", "clockwise", "counterclockwise", etc., indicating directions or positional relationships are based on the directions and positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction or be constructed and operated in a specific direction, and therefore cannot be understood as limiting the specific protection scope of the present invention.

[0036] In the claims, specification and the above drawings of the present invention, unless otherwise clearly defined, if the term "fixed connection" or "fixed connection" is used, it should be understood in a broad sense, that is, any connection method without a displacement relationship and relative rotation relationship between the two, that is to say, including non-detachable fixed connection, detachable fixed connection, integrated connection and fixed connection through other devices or elements.

[0037] In the claims, description and drawings of the present invention, if the terms "include", "have" and their variations are used, they are intended to mean "including but not limited to".

[0038] Example

[0039] The embodiment of the present invention provides an anti-interference power supply, referring to Figure 1 , which shows a partial structure of the anti-interference power supply. The anti-interference power supply includes a housing 2, a power amplifier component 1, a conductive member 5 and an electrical connector 9. Of course, in a specific implementation, the anti-interference power supply also includes other accessories to play the corresponding power supply function, and those skilled in the art can choose according to actual conditions, which will not be described in detail here.

[0040] The housing 2 of the anti-interference power supply is a box-shaped member made of sheet metal, and a cavity is formed inside the housing to place and install the corresponding accessories of the anti-interference power supply. The material of the sheet metal housing 2 is generally aluminum alloy. In the usual power supply design, the sheet metal housing 2 is grounded to ensure the safe use of the power supply.

[0041] The power amplifier component 1 of the anti-interference power supply is placed in a housing 2 and is used for power management. It includes a printed circuit board 3 and a plurality of electrical components 4 located on the back of the printed circuit board 3. In this embodiment, a plurality of electrical components 4 are further provided on the front of the printed circuit board 3. The electrical components 4 here mainly refer to the chip components used in the power amplifier component 1. Chip components are usually installed on circuit boards using surface mounting technology. Compared with traditional plug-in components, chip components do not need to be punched on the circuit board, but are directly mounted on the surface of the circuit board. Common chip components include chip resistors, chip capacitors, chip inductors, chip diodes, chip transistors, chip integrated circuits, etc.

[0042] When the power amplifier assembly 1 is placed in the housing 2, the back of the printed circuit board 3, which is the main part of the power amplifier assembly 1, is opposite to an inner wall of the housing 2. As a specific embodiment, the power amplifier assembly 1 can be regarded as being fixedly placed at a position close to the back plate of the housing 2, and the extended plane of the printed circuit board 3 of the power amplifier assembly 1 is parallel to the extended plane of the back plate of the housing 2. Generally, in order to ensure that the printed circuit board 3 can be firmly installed, the distance between the back of the printed circuit board 3 and the inner wall of the housing 2 is extremely small. In this embodiment, the range of this distance is approximately between 4 mm and 6 mm.

[0043] Such a small spacing leads to the problem that the power supply is disturbed and abnormally powered off when the electrical component 4 is set on the back of the printed circuit board 3. Specifically, in the power supply, a safety device 6 is generally set to improve the overall safety and reliability of the power supply. In this embodiment, the power supply uses a safety device 6 to connect the reference point with ground potential in the power amplifier component 1 to the housing 2, wherein the reference point with ground potential is generally set in the circuit of the printed circuit board 3, and can be regarded as the grounding point of each component with electrical connection requirements on the printed circuit board 3. Of course, since the power amplifier component 1 includes electrical modules for realizing different functions, and the corresponding grounding points of these electrical modules may not be the same, multiple reference points with ground potential will be set in the power amplifier component 1 to meet corresponding needs. The reference point with ground potential can be used as a zero potential point to provide a reference for other voltage measurements and signal transmission in the circuit, and helps to suppress common mode noise and electromagnetic interference in the circuit.

[0044] Typically, existing power supplies use Y capacitors as safety devices 6 to transfer interference signals generated by components on the power amplifier assembly 1 when they are working to the housing 2 and the ground through the printed circuit board 3 and the Y capacitor. However, when the electrical component 4 is set on the back of the printed circuit board 3, since the distance between the back of the printed circuit board 3 and the corresponding inner wall of the housing 2 is extremely small, when the power is turned on, the electrical component 4 and the sheet metal housing 2 form a large parasitic capacitance. In a power supply device with high power, the outside of the power supply (such as the power grid) will interfere with the sheet metal housing 2 connected to the ground and reversely import the power from the sheet metal housing 2. This interference will be fed back to the electrical component 4 through this parasitic capacitance, and then form a loop through the safety device 6 between the printed circuit board 3 and the sheet metal housing 2, interfering with the drive and control of the electrical component 4, and thus affecting the entire power supply.

[0045] In this embodiment, a conductive member 5 is provided, and the conductive member 5 is placed between the back side of the printed circuit board 3 and the inner wall of the housing 2, and its projection shape on the projection plane parallel to the extension direction of the printed circuit board 3 covers the electrical component 4 located on the back side of the printed circuit board 3, and the conductive member 5 is electrically connected to a reference point with ground potential in the power amplifier assembly 1.

[0046] Specifically, refer to Figure 1The conductive member 5 can be regarded as a conductive member with a planar unfolded shape, which is fixed between the back of the printed board 3 and the inner wall of the housing 2, and is electrically connected to one end of the electrical connector 9 at the side edge of one side thereof, and the other end of the electrical connector 9 is electrically connected to a reference point with a ground potential in the power amplifier assembly 1. The conductive member 5 in this embodiment includes a metal foil, which can be a copper foil, which has a high conductivity. The metal foil has an extremely small thickness and is soft and deformable. When the distance between the printed board 3 and the housing 2 is very small, the metal foil can be conveniently arranged between the printed board 3 and the housing 2, and form a certain distance between the printed board 3 and the housing 2.

[0047] Furthermore, as a preferred embodiment, the conductive member 5 adopts a flexible circuit board, and the above-mentioned metal foil is the conductor layer in the flexible circuit board. The flexible circuit board generally includes a substrate, a conductor layer, an insulating layer, a covering layer, etc. The substrate generally adopts polyimide or polyester film to provide good flexibility and insulation performance. In this embodiment, the conductor layer adopts copper foil, and the copper foil can be conductive as a whole. The insulating layer and the covering layer can adopt the same material as the substrate to improve the protection ability of both sides of the flexible circuit board. The thickness of the flexible circuit board is also very low, and it can be conveniently arranged between the printed circuit board 3 and the housing 2. The conductive layer plays a conductive role, and the film layer can protect the conductive layer to prevent the conductive layer from being worn and failing.

[0048] The electrical connector 9 may be a wire, a metal foil, or a flexible circuit board, which may be integrally formed with the conductive member 5, or may be separate components connected together. In addition, a reference point with a ground potential on the printed board 3 is set at the side of the printed board 3, which may be a solderable terminal to facilitate connection and fixation with the electrical connector 9.

[0049] In this embodiment, resin material is filled between the power amplifier assembly 1, the conductive member 5 and the housing 2 to fix the conductive member 5. The conductive member 5 is fixed by filling the resin material to prevent the conductive member 5 from shifting, and to avoid contact between the conductive member 5 and the printed circuit board 3 and the housing 2. At the same time, the resin material itself has good electrical insulation properties, which can prevent electrical short circuit or leakage.

[0050] When power is turned on, parasitic capacitance will be formed between the conductive part 5 and the sheet metal shell 2, and between the conductive part 5 and the electrical component 4. However, compared with the parasitic capacitance formed between the electrical component 4 and the shell 2 when the conductive part 5 is not provided, since the distance between the conductive part 5 and the shell 2 and the electrical component 4 is smaller, and the area of ​​the conductive part 5 is larger, the capacitance of the two parasitic capacitances formed at this time is larger. When the interference of the sheet metal shell 2 forms a loop, since the capacitance is larger and the impedance is smaller, this interference will directly enter the reference point with ground potential on the printed circuit board 3 through the conductive part 5, and then return to the shell 2 through the safety device 6 formed between the ground potential reference point on the printed circuit board 3 and the sheet metal shell 2, thus bypassing the electrical component 4, so that the electrical component 4 is less interfered, and the impact on the electrical component 4 is reduced, which also reduces the impact on the entire power supply and reduces the probability of power failure.

[0051] Among them, as a preferred embodiment, the position of the conductive member 5 between the printed board 3 and the housing 2 is farther away from the printed board 3, that is, the conductive member 5 is closer to the housing 2, which makes the parasitic capacitance formed between the conductive member 5 and the housing 2 larger, the impedance lower, and the interference is easier to pass through the conductive member 5, thereby reducing the impact on the components on the printed board 3; and the conductive member 5 is farther away from the printed board 3, and the electromagnetic coupling between the conductive member 5 and the printed board 3 will also be weakened, thereby reducing the electromagnetic interference of the conductive member 5 on the printed board 3. Among them, since the conductive member 5 is a planar component, when it is laid flat along the extension direction of the printed board 3, it can be regarded that the conductive member 5 is parallel to the corresponding inner walls of the printed board 3 and the housing 2, and at this time, the distance between the conductive member 5 and the printed board 3 and the housing 2 can be determined. Of course, in actual implementation, because the conductive part 5 is a soft metal foil, there may be displacement when installing the conductive part 5. At this time, the conductive part 5 may not be strictly parallel to the corresponding inner walls of the printed circuit board 3 and the shell 2. This situation still falls within the scope of the above-mentioned technical solution.

[0052] In addition, as described above, in the present embodiment, in addition to setting the electrical component 4 on the back of the printed board 3, the electrical component 4 is also set on the front of the printed board 3, that is, the electrical component 4 is set on both the front and back of the printed board 3, and the type of the electrical component 4 located on the front of the printed board 3 is a weak signal device, and the type of the electrical component 4 located on the back of the printed board 3 is a strong signal device, wherein the electrical component 4 located on the front of the printed board 3 is fixed by glue dispensing. Since the distance between the electrical component 4 on the front of the printed board 3 and the housing 2 is larger, the external interference has less interference on the electrical component 4 on the front of the printed board 3; and the electrical component 4 on the front of the printed board 3 is a weak signal device, and the electrical component 4 on the back of the printed board 3 is a strong signal device, the weak signal device is easily affected by external interference, and the strong signal device is less affected by external interference, so placing the weak signal device on the front of the printed board 3 can further reduce the overall impact on the power amplifier assembly 1. The electrical component 4 located on the front of the printed board 3 is fixed by glue dispensing, and the installation firmness of these electrical components 4 is enhanced.

[0053] Furthermore, in the power amplifier assembly 1 of this embodiment, a power module and a control module are also provided on the printed circuit board 3, wherein the power module is used for power conversion, and the control module is used for controlling the power module; and the projection shape of the conductive member 5 on the projection surface covers the power module and the control module.

[0054] Specifically, the important role of the power amplifier assembly 1 is to perform power conversion on the input current through the power module to increase the output power of the energy and ensure the stability of the power supply system. The control module plays a control role in the power module, which can control the switch device in the power module according to the pre-burned program or the received control signal. The components used in the power module and the control module include the above-mentioned electrical components 4, such as chip capacitors, chip resistors, etc., and also include corresponding other electrical components, such as MOSFET, IGBT, etc. These larger components are generally arranged on the front of the printed circuit board 3. It should be noted that in the power amplifier assembly 1, the positions of the power module and the control module on the printed circuit board 3 are separated from each other, that is, the corresponding area will be separated on the printed circuit board 3, and the components of the power module or the control module will be placed in the corresponding area.

[0055] Reference Figure 2According to the structural characteristics of the power amplifier assembly 1, the conductive member 5 includes a first conductive portion 7 corresponding to the position of the power module, and a second conductive portion 8 corresponding to the position of the control module. The first conductive portion 7 and the second conductive portion 8 are electrically isolated in the conductive member 5; the first conductive portion 7 is electrically connected to a reference point with a ground potential in the power module, and the second conductive portion 8 is electrically connected to a reference point with a ground potential in the control module. Correspondingly, two electrical connectors 9 are provided, which are respectively connected to the first conductive portion 7 and the second conductive portion 8. In addition, the first conductive portion 7 and the second conductive portion 8 are both formed of metal foil.

[0056] Through this design, the interference of the housing 2 is dispersed to different positions of the power amplifier component 1 through these two paths, and then fed back to the housing 2 through the capacitor device, reducing the impact of the interference on the components on the printed circuit board 3; compared with the non-divided case, this technical solution reduces the electromagnetic interference caused by the shared grounding path between the power module and the control module through physical electrical isolation and independent feedback paths, thereby improving the overall anti-interference performance of the power supply.

[0057] In general, the anti-interference power supply provided in this embodiment changes the interference transmission path of the shell 2 by setting a conductive member 5 between the printed circuit board 3 and the shell 2, and electrically connecting the conductive member 5 to a reference point with a ground potential in the power amplifier component 1, thereby reducing interference to the electrical components 4 and reducing the probability of power failure. Not only is the improvement cost low, but it also effectively improves the problems existing in the existing power supply.

[0058] The description of the above specification and embodiments is used to explain the protection scope of the present invention, but does not constitute a limitation on the protection scope of the present invention. Through the enlightenment of the present invention or the above embodiments, ordinary technicians in this field can obtain modifications, equivalent substitutions or other improvements to the embodiments of the present invention or part of the technical features thereof through logical analysis, reasoning or limited experiments, which should be included in the protection scope of the present invention.

Claims

1. An anti-interference power supply, comprising a housing (2), characterized in that include: A power amplifier assembly (1) is placed in the housing (2) and is used for power management, comprising a printed circuit board (3) and a plurality of electrical components (4) located on the back of the printed circuit board (3); the back of the printed circuit board (3) is opposite to an inner wall of the housing (2); and A conductive member (5) is placed between the back side of the printed board (3) and the inner wall of the housing (2), and its projection shape on a projection plane parallel to the extension direction of the printed board (3) covers the electrical component (4) located on the back side of the printed board (3); The conductive member (5) is electrically connected to a reference point having a ground potential in the power amplifier assembly (1); A reference point having a ground potential in the power amplifier component (1) is electrically connected to the housing (2) via a safety device (6).

2. An anti-interference power supply as claimed in claim 1, characterized in that: In the power amplifier assembly (1), a power module and a control module are also provided on the printed circuit board (3), the power module is used for power conversion, and the control module is used for controlling the power module; the projection shape of the conductive member (5) on the projection surface covers the power module and the control module.

3. An anti-interference power supply as claimed in claim 2, characterized in that: The conductive member (5) comprises a first conductive portion (7) corresponding to the position of the power module, and a second conductive portion (8) corresponding to the position of the control module, wherein the first conductive portion (7) and the second conductive portion (8) are electrically isolated within the conductive member (5); the first conductive portion (7) is electrically connected to a reference point having a ground potential in the power module, and the second conductive portion (8) is electrically connected to a reference point having a ground potential in the control module.

4. An anti-interference power supply as claimed in claim 3, characterized in that: It also includes an electrical connector (9), one end of which is electrically connected to the side edge of the conductive member (5), and the other end of which is electrically connected to a reference point with a ground potential in the power amplifier component (1).

5. An anti-interference power supply according to any one of claims 3 or 4, characterized in that: The conductive member (5) is located between the printed board (3) and the housing (2), and is further away from the printed board (3).

6. An anti-interference power supply as claimed in claim 5, characterized in that: The conductive member (5) comprises a metal foil for forming the first conductive part (7) and the second conductive part (8).

7. An anti-interference power supply as claimed in claim 6, characterized in that: The conductive element (5) is a flexible circuit board, and the metal foil is a conductor layer in the flexible circuit board.

8. An anti-interference power supply as claimed in claim 7, characterized in that: The power amplifier assembly (1) further comprises a plurality of electrical components (4) located on the front side of the printed circuit board (3), wherein the electrical components (4) located on the front side of the printed circuit board (3) are weak-electric signal devices, and the electrical components (4) located on the back side of the printed circuit board (3) are strong-electric signal devices.

9. An anti-interference power supply as claimed in claim 8, characterized in that: In the power amplifier assembly (1), the electrical component (4) located on the front side of the printed circuit board (3) is fixed by glue dispensing.

10. An anti-interference power supply according to any one of claims 6 to 9, characterized in that: Resin material is filled between the power amplifier assembly (1), the conductive member (5) and the housing (2) to fix the conductive member (5).

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