CLC filter circuit structure and energy storage power supply
By designing a CLC filter circuit structure including a first filter capacitor, a second filter capacitor and a conjugated filter inductor, the problem of poor filtering effect of the existing CLC filter circuit is solved, and a better high-frequency noise suppression effect is achieved.
Patent Information
- Application Number
- CN202420699636.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-08
- Publication Date
- 2025-03-11
- Estimated Expiration
- 2034-04-08
AI Technical Summary
The existing CLC filtering circuit has poor filtering effect in actual applications and is greatly affected by PCB design, making it difficult to achieve conjugation suppression effect.
A CLC filter circuit structure including a first filter capacitor, a second filter capacitor and a conjugated filter inductor is designed. The conjugated filtering effect between the positive and negative poles of the power supply is realized through the conjugated filter inductor, and the distance of the filter path is reduced to improve the filtering effect by optimizing the circuit layout.
Through this design, the filtering effect is significantly improved, the distance of the filter circuit is reduced, and the ability to suppress high-frequency noise and interference is enhanced.
Smart Images
Figure CN222602072U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of circuit structures, in particular to a CLC filter circuit structure and an energy storage power supply. Background Art
[0002] A switching power supply is a common type of power supply that uses switching devices (such as transistors or MOSFETs) to control the power output. In a switching power supply, the switching operation of the switching device will generate changes in high-frequency voltage and current, which will cause the power supply to generate high-frequency electromagnetic fields and radiation. Although power supply radiation does not necessarily cause direct harm to human health, excessive electromagnetic radiation may also affect the safety of other equipment. Therefore, a filter circuit is generally used at the power supply to suppress its electromagnetic radiation. Common filter circuits include CLC filter circuits, RC filter circuits, LC filter circuits, Pi filter circuits, etc. These filter circuits select different component combinations and circuit structures according to different application requirements and frequency ranges to achieve the purpose of filtering out noise and interference of different frequencies. Among them, the CLC filter circuit is a common power supply filter circuit, which consists of three components: capacitor (C), inductor (L) and capacitor (C). It can effectively reduce high-frequency noise and interference in the power supply. The working principle of the CLC filter circuit: The capacitor (C1) is a component that can store charge, and can filter out high-frequency noise in the power supply by short-circuiting the high-frequency noise. It guides high-frequency signals to the ground, preventing them from propagating into the circuit through the power line; Inductor (L): As a component that can store current, the inductor can filter out high-frequency noise in the power supply by providing impedance to the current. It creates a self-inductance in the circuit, making it difficult for the current of the high-frequency signal to pass through the inductor; Capacitor (C2): As a component that can store charge, the capacitor can act as a low-impedance path to filter out low-frequency noise and interference. It provides a low-impedance path so that low-frequency signals can pass through the capacitor without being blocked. However, the CLC filter circuit cannot play the role of conjugate suppression in the actual circuit, and is greatly affected by the PCB design. Different layouts and routing can affect the performance and effect of the filter circuit. That is, the existing CLC filter circuit still has poor filtering effect, and a new CLC filter circuit structure needs to be designed to improve the filtering effect. Utility Model Content
[0003] Therefore, it is necessary to provide a CLC filter circuit structure and an energy storage power supply to solve the problem of insufficient filtering effect of the existing CLC filter circuit.
[0004] To achieve the above-mentioned purpose, the utility model provides a CLC filter circuit structure, including a first filter capacitor, a second filter capacitor and a conjugate filter inductor, the conjugate filter inductor includes a conjugate first filter inductor coil and a second filter inductor coil, and also includes a PCB board and an input power positive copper foil, an input power negative copper foil, an output power positive copper foil and an output power negative copper foil arranged on the PCB board, the input power positive copper foil is connected to one end of the first filter inductor coil, the input power negative copper foil is connected to one end of the second filter inductor coil, the output power positive copper foil is connected to the other end of the first filter inductor coil, the output power negative copper foil is connected to the other end of the second filter inductor coil, one end of the first filter capacitor is connected to the input power positive copper foil, the other end of the first filter capacitor is connected to the input power negative copper foil, one end of the second filter capacitor is connected to the output power positive copper foil, the other end of the second filter capacitor is connected to the output power negative copper foil, the conjugate filter inductor is arranged on one side of the PCB board, and the first filter capacitor and the second filter capacitor are arranged on the other side of the PCB board and close to the conjugate filter inductor.
[0005] Furthermore, the conjugate filter inductor is a pin-type conjugate filter inductor, the positive copper foil of the input power supply is connected to one end of the first filter inductor coil through a via on the PCB board, the negative copper foil of the input power supply is connected to one end of the second filter inductor coil through a via on the PCB board, the positive copper foil of the output power supply is connected to the other end of the first filter inductor coil through a via on the PCB board, and the negative copper foil of the output power supply is connected to the other end of the second filter inductor coil through a via on the PCB board.
[0006] Furthermore, the first filter capacitor or the second filter capacitor is arranged in a projection area of the conjugate filter inductor perpendicular to the PCB board.
[0007] Furthermore, the first filter capacitor and the second filter capacitor are filter chip capacitors, and the first filter capacitor and the second filter capacitor are arranged on the other side of the PCB board.
[0008] Furthermore, the input power positive copper foil, the input power negative copper foil, the output power positive copper foil and the output power negative copper foil are provided on one side and the other side of the PCB board, and the copper foils on both sides are connected through a plurality of vias.
[0009] Furthermore, it also includes power socket connecting pins arranged on the PCB board, and the power socket connecting pins are two and are respectively connected to the input power positive copper foil and the input power negative copper foil.
[0010] Furthermore, pads are provided on the surfaces of the output power positive electrode copper foil and the output power negative electrode copper foil, and the pads are used for welding with power supply wires.
[0011] The utility model provides an energy storage power supply, comprising an energy storage battery, a battery charging circuit and a CLC filter circuit structure, wherein the energy storage battery is connected to the CLC filter circuit structure through the battery charging circuit, and the CLC filter circuit structure is the CLC filter circuit structure described in any one of the embodiments of the utility model.
[0012] Different from the prior art, the above-mentioned technical solution of the utility model can realize the input and output of power supply through the input power supply positive copper foil, the input power supply negative copper foil, the output power supply positive copper foil and the output power supply negative copper foil. The conjugate filtering effect between the positive and negative poles of the power supply can be realized through the conjugate filter inductor. At the same time, the CLC filter circuit is realized through the first filter capacitor, the second filter capacitor and the inductor coil in the conjugate filter inductor, thereby improving the filtering effect. Then, by setting the conjugate filter inductor on one side of the PCB board, and setting the first filter capacitor and the second filter capacitor on the other side of the PCB board and close to the conjugate filter inductor, the filtering path can be as short as possible, reducing the distance of the filter circuit, and further improving the filtering effect. BRIEF DESCRIPTION OF THE DRAWINGS
[0013] Figure 1 This is a schematic diagram of the front side of the PCB board in the CLC filter circuit structure of the utility model;
[0014] Figure 2 It is a schematic diagram of the back side of the PCB board in the CLC filter circuit structure of the utility model;
[0015] Figure 3 It is a schematic diagram of the structure of the conjugate filter inductor in the CLC filter circuit structure of the utility model;
[0016] Figure 4 Another schematic diagram of the front side of the PCB board in the CLC filter circuit structure of the utility model;
[0017] Figure 5 This is a schematic diagram of the circuit structure of the energy storage power supply of the utility model.
[0018] Description of reference numerals:
[0019] 1. The first filter capacitor;
[0020] 2. The second filter capacitor;
[0021] 3. Conjugate filter inductor;
[0022] 30. A first filter inductor;
[0023] 31. A second filter inductor;
[0024] 4. PCB board;
[0025] 40. Input power positive copper foil;
[0026] 41. Input power negative copper foil;
[0027] 42. Output power positive copper foil;
[0028] 43. Output power negative electrode copper foil;
[0029] 6. Power socket connection pin;
[0030] 7. Soldering pad. DETAILED DESCRIPTION
[0031] In order to explain the technical content, structural features, achieved objectives and effects of the technical solution in detail, the following is a detailed description in conjunction with specific embodiments and accompanying drawings.
[0032] Reference to "embodiment" herein means that the specific features, structures or characteristics described in conjunction with the embodiment may be included in at least one embodiment of the present application. The term "embodiment" appearing in various places in the specification does not necessarily refer to the same embodiment, nor does it particularly limit its independence or association with other embodiments. In principle, in the present application, as long as there is no technical contradiction or conflict, the various technical features mentioned in the embodiments can be combined in any way to form a corresponding implementable technical solution.
[0033] Unless otherwise defined, the technical terms used in this document have the same meanings as those generally understood by those skilled in the art to which this application belongs; the use of relevant terms in this document is only for describing specific embodiments and is not intended to limit this application.
[0034] In the description of this application, the term "and / or" is an expression used to describe the logical relationship between objects, indicating that three relationships may exist, for example, A and / or B, which means: A exists, B exists, and A and B exist at the same time. In addition, the character " / " in this article generally indicates that the objects before and after are in an "or" logical relationship.
[0035] In the present application, terms such as “first” and “second” are merely used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship of quantity, priority or sequence between these entities or operations.
[0036] Without further limitations, in this application, the words "include", "comprises", "has" or other similar expressions used in the sentences are intended to cover non-exclusive inclusion. These expressions do not exclude the presence of additional elements in the process, method or product including the elements, so that the process, method or product including a series of elements may include not only those limited elements, but also other elements not explicitly listed, or also include elements inherent to such process, method or product.
[0037] Similar to the understanding in the Patent Examination Guidelines, in this application, expressions such as "greater than", "less than", "exceed" and the like are understood to exclude the number itself; expressions such as "above", "below", "within" and the like are understood to include the number itself. In addition, in the description of the embodiments of this application, "multiple" means more than two (including two), and similar expressions related to "multiple" are also understood in this way, such as "multiple groups", "multiple times", etc., unless otherwise clearly and specifically limited.
[0038] In the description of the embodiments of the present application, space-related expressions used, such as "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "vertical", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicate the orientation or position relationship based on the orientation or position relationship shown in the specific embodiments or drawings, and are only for the convenience of describing the specific embodiments of the present application or facilitating the reader's understanding, and do not indicate or imply that the referred device or component must have a specific position, a specific orientation, or be constructed or operated in a specific orientation, and therefore cannot be understood as a limitation on the embodiments of the present application.
[0039] Unless otherwise expressly specified or limited, in the description of the embodiments of the present application, the terms such as "install", "connect", "connect", "fix", "set", etc. used should be understood in a broad sense. For example, the "connection" can be a fixed connection, a detachable connection, or an integrated setting; it can be a mechanical connection, an electrical connection, or a communication connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium; it can be the internal connection of two elements or the interaction relationship between two elements. For technicians in the technical field to which the present application belongs, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.
[0040] See also Figure 1-Figure 5The utility model provides a CLC filter circuit structure, including a first filter capacitor 1, a second filter capacitor 2 and a conjugate filter inductor 3, wherein the conjugate filter inductor 3 includes a conjugate first filter inductor coil 30 and a second filter inductor coil 31, and further includes a PCB board 4 and an input power positive copper foil 40, an input power negative copper foil 41, an output power positive copper foil 42 and an output power negative copper foil 43 arranged on the PCB board 4, wherein the input power positive copper foil 40 is connected to one end of the first filter inductor coil 30, the input power negative copper foil 41 is connected to one end of the second filter inductor coil 31, and the output power positive copper foil 42 is connected to the output power negative copper foil 43. The other end of the first filter inductor 30 is connected, the output power negative copper foil 43 is connected to the other end of the second filter inductor 31, one end of the first filter capacitor 1 is connected to the input power positive copper foil 40, the other end of the first filter capacitor 1 is connected to the input power negative copper foil 41, one end of the second filter capacitor 2 is connected to the output power positive copper foil 42, the other end of the second filter capacitor 2 is connected to the output power negative copper foil 43, the conjugate filter inductor 3 is arranged on one side of the PCB board 4, and the first filter capacitor 1 and the second filter capacitor 2 are arranged on the other side of the PCB board 4 and close to the conjugate filter inductor 3.
[0041] Among them, the diagram of conjugate inductance is as follows Figure 3 As shown, the structure of the conjugate inductor is usually that two inductors share a magnetic field, close to each other but not directly connected. This structure forms an electromagnetic coupling between the two inductors, which can suppress high-frequency fluctuations in the circuit. Preferably, the value of the filter capacitor is between 3NF-10UF, and the value of the inductor is between 100NH-200UH, which can achieve a better filtering effect. The utility model can realize the input and output of the power supply through the input power supply positive copper foil 40, the input power supply negative copper foil 41, the output power supply positive copper foil 42 and the output power supply negative copper foil 43. The conjugate filtering effect between the positive and negative poles of the power supply can be realized through the conjugate filter inductor 3. At the same time, through the first filter capacitor 1, the second filter capacitor 2 and the inductor in the conjugate filter inductor 3, a CLC filter circuit is realized, and the filtering effect is improved. Then, by setting the conjugate filter inductor 3 on one side of the PCB board 4 and setting the first filter capacitor 1 and the second filter capacitor 2 on the other side of the PCB board 4 and close to the conjugate filter inductor 3, the filtering path can be made as short as possible, reducing the distance of the filtering circuit and further improving the filtering effect.
[0042] The pins of the conjugate filter inductor 3 can be pin-type or surface-mount type. Preferably, Figure 4As shown, the conjugate filter inductor 3 is a pin-type conjugate filter inductor 3, the input power positive copper foil 40 is connected to one end of the first filter inductor coil 30 through a via 50 on the PCB board 4, the input power negative copper foil 41 is connected to one end of the second filter inductor coil 31 through a via 51 on the PCB board 4, the output power positive copper foil 42 is connected to the other end of the first filter inductor coil 30 through a via 52 on the PCB board 4, and the output power negative copper foil 43 is connected to the other end of the second filter inductor coil 31 through a via 53 on the PCB board 4. The pin can penetrate the PCB board 4, which plays a good fixing role.
[0043] In order to improve the filtering effect of the filter capacitor, Figure 2 As shown, the first filter capacitor 1 or the second filter capacitor 2 is arranged in the projection area of the conjugate filter inductor 3 perpendicular to the PCB board 4. Figure 3 The first filter capacitor 1 is arranged between two pins (pins) of the conjugate filter inductor 3, that is, in the projection area of the conjugate filter inductor 3, so that the distance between the first filter capacitor 1 and the conjugate filter inductor 3 can be greatly reduced, thereby improving the filtering effect of the filter capacitor. The second filter capacitor 2 can also be arranged with reference to the first filter capacitor 1.
[0044] The first filter capacitor 1 may be a pin-type filter capacitor. Figure 2 As shown, the first filter capacitor 1 and the second filter capacitor 2 are filter chip capacitors, and the first filter capacitor 1 and the second filter capacitor 2 are arranged on the other side of the PCB board 4. This can avoid interference between the pins of the filter capacitor and the conjugate filter inductor 3, further reduce the distance between the filter capacitor and the conjugate filter inductor 3, and improve the filtering effect.
[0045] Furthermore, the input power positive copper foil 40, the input power negative copper foil 41, the output power positive copper foil 42 and the output power negative copper foil 43 are provided on one side and the other side of the PCB board 4, and the copper foils on both sides are connected through a plurality of vias. Figure 1 and Figure 2 As shown, there are multiple vias on the surface of the copper foil area, and the copper foil area can be increased and the connection resistance can be reduced through the multiple vias.
[0046] In order to form a connection with an external power source (such as an external DC power source), further, as Figure 4 As shown, it also includes a power socket connection pin 6 arranged on the PCB board 4, and the power socket connection pin 6 is two and is respectively connected to the input power positive copper foil 40 and the input power negative copper foil 41. A power socket, such as a power socket of model DC7909, can be welded through the power socket connection pin 6, and then an external direct current can be plugged into the power socket to connect the power supply.
[0047] Furthermore, the surfaces of the output power positive copper foil 42 and the output power negative copper foil 43 are provided with pads 7, and the pads 7 are used for welding with power wires. The power wires can be connected to internal power modules, such as DCDC transformer modules, and then provided to internal controllers, etc., to achieve internal power access.
[0048] The utility model also provides an energy storage power supply, such as Figure 5 As shown, it includes an energy storage battery, a battery charging circuit and a CLC filter circuit structure. The energy storage battery is connected to the CLC filter circuit structure through the battery charging circuit. The CLC filter circuit structure is the CLC filter circuit structure described in any one of the embodiments of the utility model. The energy storage power supply of the utility model can be connected to an external power supply at the input power supply end (input power positive copper foil 40, input power negative copper foil 41) of the CLC filter circuit structure, and then the external power supply is charged to the energy storage battery after passing through the battery charging circuit to achieve energy storage. The battery charging circuit is used to perform voltage conversion, detect the state of the energy storage battery and control whether to charge, and can be an existing charging circuit. The energy storage power supply can be discharged to the outside when in use, and the existing energy storage power supply discharge circuit can be used, which will not be repeated in the utility model. The energy storage power supply of the utility model improves the filtering effect through the CLC filter circuit.
[0049] It should be noted that although the above embodiments have been described in this article, this does not limit the scope of patent protection of the utility model. Therefore, based on the innovative concept of the utility model, changes and modifications to the embodiments described in this article, or equivalent structural or equivalent process changes made using the contents of the utility model specification and drawings, directly or indirectly applying the above technical solutions to other related technical fields are all included in the scope of protection of the utility model patent.
Claims
1. A CLC filter circuit structure, comprising a first filter capacitor, a second filter capacitor and a conjugate filter inductor, wherein the conjugate filter inductor comprises a conjugate first filter inductor coil and a second filter inductor coil, characterized in that: It also includes a PCB board and an input power positive copper foil, an input power negative copper foil, an output power positive copper foil and an output power negative copper foil arranged on the PCB board, the input power positive copper foil is connected to one end of the first filter inductor coil, the input power negative copper foil is connected to one end of the second filter inductor coil, the output power positive copper foil is connected to the other end of the first filter inductor coil, the output power negative copper foil is connected to the other end of the second filter inductor coil, one end of the first filter capacitor is connected to the input power positive copper foil, the other end of the first filter capacitor is connected to the input power negative copper foil, one end of the second filter capacitor is connected to the output power positive copper foil, the other end of the second filter capacitor is connected to the output power negative copper foil, the conjugate filter inductor is arranged on one side of the PCB board, and the first filter capacitor and the second filter capacitor are arranged on the other side of the PCB board and close to the conjugate filter inductor.
2. A CLC filter circuit structure according to claim 1, characterized in that: The conjugate filter inductor is a pin-type conjugate filter inductor, the positive copper foil of the input power supply is connected to one end of the first filter inductor coil through a via on the PCB board, the negative copper foil of the input power supply is connected to one end of the second filter inductor coil through a via on the PCB board, the positive copper foil of the output power supply is connected to the other end of the first filter inductor coil through a via on the PCB board, and the negative copper foil of the output power supply is connected to the other end of the second filter inductor coil through a via on the PCB board.
3. A CLC filter circuit structure according to claim 1, characterized in that: The first filter capacitor or the second filter capacitor is arranged in a projection area of the conjugate filter inductor perpendicular to the PCB board.
4. A CLC filter circuit structure according to claim 1, characterized in that: The first filter capacitor and the second filter capacitor are filter chip capacitors, and the first filter capacitor and the second filter capacitor are arranged on the other side of the PCB board.
5. A CLC filter circuit structure according to claim 1, characterized in that: The input power positive copper foil, input power negative copper foil, output power positive copper foil and output power negative copper foil are arranged on one side and the other side of the PCB board, and the copper foils on both sides are connected through multiple vias.
6. A CLC filter circuit structure according to claim 1, characterized in that: It also includes power socket connecting pins arranged on the PCB board, and the power socket connecting pins are two and are respectively connected to the input power positive copper foil and the input power negative copper foil.
7. A CLC filter circuit structure according to claim 1, characterized in that: The surfaces of the output power positive electrode copper foil and the output power negative electrode copper foil are provided with welding pads, and the welding pads are used for welding with power supply wires.
8. An energy storage power supply, characterized in that: It comprises an energy storage battery, a battery charging circuit and a CLC filter circuit structure, wherein the energy storage battery is connected to the CLC filter circuit structure through the battery charging circuit, and the CLC filter circuit structure is the CLC filter circuit structure according to any one of claims 1 to 7.