EMC (Electro Magnetic Compatibility) modular power supply

Abstract

The utility model belongs to the technical field of power supply circuit boards, and particularly relates to an EMC (Electro Magnetic Compatibility) modular power supply, which comprises a power supply circuit board and an EMC module board, the power supply circuit board comprises a power supply terminal, an AC / DC (Alternating Current / Direct Current) rectifying circuit, a transformer output circuit and a power supply output end which are electrically connected in sequence, the EMC module board is provided with an input terminal, an EMC circuit and a butt joint terminal which are electrically connected in sequence, a detachable wire is connected between the power supply terminal and the butt joint terminal, and the power supply circuit board and the EMC module board are detachably installed in the power supply shell. According to the switching power supply structure provided by the utility model, the circuit board of the rectification output part and the circuit board of the EMC part are separated, so that modular matching of circuits with two functions is facilitated according to different product authentication standards and product use requirements, the material inventory cost and the production cost of enterprises are reduced, and the production efficiency is improved. And the damaged module can be conveniently and directly replaced during maintenance.

Description

Technical Field

[0001] This utility model relates to the field of power circuit board technology, and more specifically, to EMC modular power supplies. Background Technology

[0002] EMC (Electromagnetic Compatibility) refers to the ability of a product or device to neither interfere with nor be interfered with by the electromagnetic energy generated by other products or devices. EMI (Electromagnetic Interference) refers to the interference phenomenon caused by the interaction of electromagnetic waves with electronic components, and it has two forms: conducted interference and radiated interference.

[0003] Due to the widespread application of electromagnetic technology, products and equipment resulting from this technology are susceptible to electromagnetic interference from other products and equipment, or may cause electromagnetic interference to other products and equipment. Therefore, the normal operation of these products and equipment necessitates attention to this phenomenon. Consequently, in the current environment, almost all power supply products must undergo EMI testing, and their electromagnetic interference levels must meet the electromagnetic interference limits stipulated by national standards. Specifically, the CE certification used in the European Union also includes EMC (electromagnetic compatibility) certification, which includes EMI testing and EMS (electromagnetic susceptibility) testing. EMS testing measures the inability to avoid performance degradation under electromagnetic interference; higher susceptibility indicates lower immunity to interference.

[0004] In existing technologies, to reduce the electromagnetic interference (EMI) level of switching power supplies and improve their EMI immunity, an EMI filter circuit is typically added to the power supply's input port. A common EMC circuit on the market is shown in patent number CN201721820382.8, entitled "A Low-Cost Switching Power Supply EMI Filter Circuit." This circuit includes a rectifier module connected in sequence, and a π-type filter module composed of an inductor L1 and an electrolytic capacitor. The rectifier module is connected to an external switching power supply, and the π-type filter module can filter out EMC interference generated by the switching power supply and reduce DC current ripple. It is used in low-power switching power supplies.

[0005] However, the EMC circuit needs to be manufactured on the same circuit board as the main power supply circuit, but certification standards vary across regions and products. Therefore, to meet various EMC certification requirements and adapt to different specifications of switching power supplies, companies need to design and manufacture multiple switching power supply circuit boards with integrated EMC circuits. For example, even for the same model of switching power supply, multiple EMC configuration circuit boards often need to be produced to meet different customer requirements or certification requirements. This results in significant inventory pressure for companies, difficulty in reducing production costs, and inconvenience in maintenance.

[0006] Therefore, it is necessary to improve the flexibility of matching switching power supply circuit boards and EMC circuits in order to meet different certification and product use requirements. Utility Model Content

[0007] To address the current issues of EMC circuitry and power supply body being manufactured on a single circuit board in switching power supplies, requiring the production of multiple EMC configurations for the same switching power supply according to different customer or certification requirements, resulting in significant material inventory pressure, difficulty in reducing production costs, and inconvenience in maintenance, we offer modular EMC power supplies.

[0008] The EMC modular power supply includes a power circuit board and an EMC module board. The power circuit board includes power terminals, AC / DC rectifier circuits, transformer output circuits, and power output terminals that are electrically connected in sequence. The EMC module board is provided with input terminals, EMC circuits, and docking terminals that are electrically connected in sequence. A detachable wire is connected between the power terminals and the docking terminals. Both the power circuit board and the EMC module board can be detachably installed in the power supply housing.

[0009] Furthermore, the EMC circuit includes an input filter component, a current limiting and voltage dividing component, and an output filter component connected in sequence.

[0010] Furthermore, the power supply terminals and power output terminals are respectively located on opposite sides of the power circuit board.

[0011] Furthermore, the input terminals and the docking terminals are respectively located on opposite sides of the EMC module board, and the orientation of the input terminals is the same as that of the power supply terminals.

[0012] Furthermore, the input terminals on the EMC module board are detachably connected to a surge protection module board via wires, and the surge protection module board, the EMC module board, and the power circuit board are sequentially installed in the power supply housing.

[0013] Furthermore, the width of the surge protection module board, the EMC module board, and the power circuit board is equal to the width of the inner side of the power supply housing.

[0014] Furthermore, a surge protection circuit is provided between the input terminals on the EMC module board and the EMC circuit, and the width of the power circuit board and the EMC module board is equal to the width of the inner side of the power supply housing.

[0015] The advantages of this utility model are:

[0016] 1. The general overall switching power supply circuit board is split into different parts such as rectifier output module, EMC module, and surge protection module, which can be flexibly matched according to product certification and product usage requirements.

[0017] 2. By connecting modules, it is possible to quickly switch production lines to produce switching power supply products that meet the needs of different customers, which helps to reduce enterprise production costs and inventory costs.

[0018] 3. The modules are connected by terminals and wires, which ensures stable wiring and convenient assembly and disassembly.

[0019] 4. Damaged modules can be directly replaced during maintenance, significantly reducing the difficulty of equipment maintenance.

[0020] 5. The equipment has a compact structure and is easy to assemble. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is the circuit schematic of the power supply circuit board;

[0023] Figure 2 This is the circuit schematic of the EMC module board;

[0024] Figure 3 The circuit diagram of the surge protection module board;

[0025] Figure 4 A top view of the EMC modular power supply.

[0026] Figure 5 An exploded view of another embodiment of the EMC modular power supply.

[0027] Attached image labels:

[0028] 1. Power supply circuit board; 101. Power terminal; 102. AC / DC rectifier circuit; 103. Transformer output circuit; 104. Power supply output terminal; 2. EMC module board; 201. Input terminal; 202. EMC circuit; 203. Connecting terminal; 3. Lightning protection module board; 301. Lightning protection circuit; 4. Wires; 5. Power supply housing; 6. Input filter assembly; 7. Current limiting and voltage divider assembly; 8. Output filter assembly; 9. Screws. Detailed Implementation

[0029] To address the current issues of EMC circuitry and power supply body being manufactured on a single circuit board in switching power supplies, requiring the production of multiple EMC configurations for the same switching power supply according to different customer or certification requirements, resulting in significant material inventory pressure, difficulty in reducing production costs, and inconvenience in maintenance, we offer modular EMC power supplies.

[0030] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0031] It should be noted that the terms such as "inner", "middle" and "one" used in this specification are only for clarity of description and are not intended to limit the scope of implementation of this utility model. Any changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered as part of the scope of implementation of this utility model, as stated above.

[0032] In the description of this utility model, it should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "vertical," and "horizontal," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this utility model, it should be noted that unless otherwise explicitly specified and limited, the terms "installed," "connected," and "joined" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal connection of two components. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood through specific circumstances. Example 1

[0033] like Figures 1 to 4 As shown, this embodiment provides an EMC modular power supply, including a power circuit board 1 and an EMC module board 2. The power circuit board 1 includes a power terminal 101, an AC / DC rectifier circuit 102, a transformer output circuit 103, and a power output terminal 104 that are connected in sequence. The EMC module board 2 is provided with an input terminal 201, an EMC circuit 202, and a docking terminal 203 that are connected in sequence. A detachable wire 4 is connected between the power terminal 101 and the docking terminal 203. Both the power circuit board 1 and the EMC module board 2 can be detachably installed in the power supply housing 5.

[0034] Because the power circuit board 1 and EMC module board 2 are designed as separate units, different specifications of power circuit board 1 and EMC module board 2 can be flexibly combined according to customer needs. This is particularly convenient for selecting different specifications of EMC module board 2 based on the EMC and EMI certification requirements of different regions, enabling rapid matching of customer needs to produce power supply products. Furthermore, the detachable design of both power circuit board 1 and EMC module board 2 is achieved in this embodiment using through-hole connections with screws 9, facilitating quick replacement of damaged modules during equipment maintenance and helping to reduce the difficulty of equipment repair.

[0035] The EMC circuit 202 includes an input filter component 6, a current limiting and voltage dividing component 7, and an output filter component 8 connected in sequence.

[0036] Specifically, when current is input from the L and N terminals, it first passes through the common-mode inductors L2 and L3 (AS0805125, 160μH) of the filter component 6, suppressing common-mode interference signals and achieving filtering. Then, the current flows to the parallel resistor circuit composed of R1, R2, R3, and R4 (all with a resistance of 1MΩ), i.e., the current-limiting voltage divider component 7, for voltage division and current limiting. Next, it passes through the output filter component 8, composed of capacitor XC2 (275V / 155), common-mode inductor L1, capacitor XC1 (310V / 155), and parallel capacitors YC1 and YC2 (both 300V / 222). These capacitors filter out interference from different frequency bands. Finally, the current is output to the power circuit board 1 from connector K1 (8.25 - 3P), i.e., the mating terminal 203.

[0037] The power supply terminal 101 and the power output terminal 104 are respectively located on opposite sides of the power supply circuit board 1. The opposite arrangement of the input and output terminals on the power supply circuit board 1 makes them easy to distinguish and avoids incorrect wiring.

[0038] The input terminal 201 and the docking terminal 203 are respectively located on opposite sides of the EMC module board 2, and the orientation of the input terminal 201 is the same as that of the power terminal 101. The current flow of the two terminals on the EMC module board 2 is the same as that of the power circuit board 1, which facilitates sequential docking of the EMC module board 2 and the power circuit board 1 and reduces assembly difficulty.

[0039] The input terminal 201 on the EMC module board 2 is detachably connected to the surge protection module board 3 via wire 4. The surge protection module board 3, the EMC module board 2, and the power circuit board 1 are sequentially installed in the power supply housing 5. In addition to the EMC module board 2, the surge protection circuit commonly used in switching power supplies can also be modularly designed to further improve the production flexibility of switching power supply products and adapt to various customer needs.

[0040] The widths of the surge protection module board 3, EMC module board 2, and power circuit board 1 are equal to the width of the inner side of the power housing 5. During assembly, the surge protection module board 3, EMC module board 2, and power circuit board 1 can be quickly and sequentially inserted into the power housing 5 for fixation, resulting in high production efficiency and fewer errors. Example 2

[0041] like Figure 5 As shown, a surge protection circuit 301 is provided between the input terminal 201 and the EMC circuit 202 on the EMC module board 2. The width of the power circuit board 1 and the EMC module board 2 is equal to the width of the inner side of the power supply housing 5. Besides designing the EMC and surge protection circuits separately, they can also be integrated to improve the assembly speed of the power supply product.

[0042] In actual production, first select the appropriate power circuit board 1 and EMC module board 2 according to customer requirements (the surge protection module board 3 is selected as needed). Then, the workers install the EMC module board 2 and the power circuit board 1 into the power housing 5, which has the same width and a length designed according to the sum of the power circuit board 1 and the EMC module board 2. Finally, connect the wires 4 between the terminals to complete the product assembly process of the switching power supply.

[0043] The above description is a further detailed explanation of the present utility model in conjunction with specific preferred embodiments. It should not be assumed that the specific implementation of the present utility model is limited to these descriptions. All equivalent changes and modifications made within the scope of this application should still fall within the scope of the present utility model.

Claims

1. EMC modular power supply, characterized in that, The power supply circuit board comprises power supply terminals, an AC / DC rectifier circuit, a transformer output circuit and a power supply output end connected in sequence, and the EMC module board comprises input terminals, an EMC circuit and a docking terminal connected in sequence.

2. The EMC modular power supply of claim 1, wherein, The EMC circuit comprises an input filter assembly, a current-limiting voltage-dividing assembly and an output filter assembly connected in sequence.

3. The EMC modular power supply of claim 1, wherein, The power supply terminals and the power supply output end are arranged on opposite sides of the power supply circuit board.

4. The EMC modular power supply of claim 3, wherein, The input terminals and the docking terminal are arranged on opposite sides of the EMC module board, and the input terminals have the same orientation as the power supply terminals.

5. The EMC modular power supply of claim 1, wherein, The input terminals on the EMC module board are detachably connected to a lightning protection module board through a wire, and the lightning protection module board, the EMC module board and the power supply circuit board are sequentially arranged in the power supply housing.

6. The EMC modular power supply of claim 5, wherein, The widths of the lightning protection module board, the EMC module board and the power supply circuit board are equal to the width of the inner side of the power supply housing.

7. The EMC modular power supply of claim 1, wherein, The input terminals on the EMC module board are connected to a lightning protection circuit between the input terminals and the EMC circuit, and the widths of the power supply circuit board and the EMC module board are equal to the width of the inner side of the power supply housing.

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