High-power vehicle-mounted DC power supply EMI filtering device
By using two-stage differential mode two-stage common mode input EMI circuit and two-stage common mode output EMI circuit in high-power vehicle DC power supply, the filter performance reduction caused by parasitic parameters under high-frequency conditions is solved, and the conduction and Radiation disturbs noise, improving power supply stability and signal quality.
Patent Information
- Application Number
- CN202420528926.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-03-19
- Publication Date
- 2024-12-31
- Estimated Expiration
- 2034-03-19
AI Technical Summary
When using interlaced parallel synchronous rectified BUCK power supply, inductive coupling, component interference in feedback loops and high-speed on-off of switching devices under high frequency conditions lead to serious over-standard conduction and radiation interference noise, affecting power supply stability and signal quality, and interfering with other modules or the normal operation of the equipment.
Design a high-power vehicle-mounted DC power supply EMI filtering device, adopts two-stage differential mode two-stage common mode input EMI circuit and two-stage common mode output EMI circuit, offsets the self-parasitic parameters through equivalent negative parameters, and combines impedance adaptation principles and Noise source impedance and LISN terminal equivalent load impedance, design filter topology to reduce filter insertion loss.
It effectively solves the problem of serious excessive noise in conduction and radiation interference, improves power supply stability and signal quality, and prevents interference from affecting the normal operation of other modules or equipment.
Smart Images
Figure CN222283076U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of signal processing, and in particular relates to a high-power vehicle-mounted direct current power supply EMI filtering device. Background Art
[0002] In a Chinese patent with publication number CN215646740U, a filtering device and a filtering system are disclosed, which belong to the field of signal processing technology. The filtering device includes: at least two inductive coupling components and multiple adjustment devices; each inductive coupling component includes multiple air-core inductors, and the multiple air-core inductors are arranged at preset relative positions so that the equivalent inductance value of the inductive coupling component is the expected inductance value; the inductive coupling components are connected in sequence, and each adjustment device is connected to one of the inductive coupling components of at least two inductive coupling components. The filtering system includes: a filtering device and an external working circuit, and the input and output ends of the filtering device are respectively connected to the external working circuit to filter the electrical signal provided by the external working circuit. The present application can more accurately determine the modulation frequency and can be applied to filtering adjustments in extreme environments.
[0003] During the application process, the applicant discovered that the above application had defects during use. When the power supply uses an interleaved parallel synchronous rectification BUCK power supply, due to inductive coupling under high frequency conditions, component interference in the feedback loop, high-speed on and off of switching devices, etc., it may cause the conducted and radiated interference noise to seriously exceed the standard, thereby affecting the power supply stability and signal quality, and interfering with the normal operation of other modules or equipment. Utility Model Content
[0004] The purpose of the utility model is to provide a high-power vehicle-mounted DC power supply EMI filtering device to solve the problems raised in the above background technology.
[0005] In order to achieve the above purpose, the utility model provides the following technical solutions:
[0006] A high-power vehicle-mounted DC power supply EMI filtering device, comprising:
[0007] An input module, wherein the input module uses a two-stage differential mode and two-stage common mode input EMI circuit;
[0008] A power supply module, wherein the power supply module is two staggered parallel synchronous rectification BUCK power supplies;
[0009] Output module, the output module uses a two-stage common-mode output EMI circuit.
[0010] Preferably, the input EM I circuit includes a first differential mode filter module arranged on the positive line and a second differential mode filter module arranged on the negative line, and a third differential mode filter module, a fourth differential mode filter module and a fifth differential mode filter module are arranged in parallel between the positive line and the negative line.
[0011] Preferably, a first common mode filter module is arranged between the third differential mode filter module and the fourth differential mode filter module, the positive line and the negative line are introduced from one side of the first common mode filter module and led out from the other side, a second common mode filter module is arranged between the fourth differential mode filter module and the fifth differential mode filter module, the positive line and the negative line are introduced from one side of the second common mode filter module and led out from the other side, the positive pole of the third differential mode filter module is connected to the third common mode filter module, the negative pole of the third differential mode filter module is connected to the fourth common mode filter module, the positive pole of the fourth differential mode filter module is connected to the fifth common mode filter module, and the negative pole of the fourth differential mode filter module is connected to the sixth common mode filter module.
[0012] Preferably, the output EMI circuit includes a sixth differential mode filter module, a seventh differential mode filter module and an eighth differential mode filter module which are arranged in parallel on the positive line and the negative line.
[0013] Preferably, a seventh common mode filter module is arranged between the sixth differential mode filter module and the seventh differential mode filter module, the positive line and the negative line are introduced from one side of the seventh common mode filter module and led out from the other side, an eighth common mode filter module is arranged between the seventh differential mode filter module and the eighth differential mode filter module, the positive line and the negative line are introduced from one side of the eighth common mode filter module and led out from the other side, the positive pole of the sixth differential mode filter module is connected to the ninth common mode filter module, the negative pole of the sixth differential mode filter module is connected to the tenth common mode filter module, the positive pole of the seventh differential mode filter module is connected to the eleventh common mode filter module, and the negative pole of the seventh differential mode filter module is connected to the twelfth common mode filter module.
[0014] Compared with the prior art, the beneficial effects of the utility model are:
[0015] The utility model sets a two-stage differential mode and two-stage common mode input EMI filter circuit and a two-stage common mode output EMI filter circuit, aims at the problem that filter performance is reduced due to parasitic parameters of filter elements such as capacitors and inductors under high frequency conditions, adopts a method of offsetting self-parasitic parameters with equivalent negative parameters, designs a two-stage differential mode and two-stage common mode input EMI filter device, solves the negative impact brought by parasitic parameters, determines the design requirements according to the original noise of the switching power supply, determines the filter topology according to the impedance adaptation principle, and then comprehensively considers the influence of noise source impedance, LISN end equivalent load impedance and high-frequency distribution parameters of the EMI filter on the filter insertion loss, designs a two-stage common mode output EMI filter device, and effectively solves the problem that the conducted and radiated interference noise seriously exceeds the standard, thereby affecting the power supply stability and signal quality, and interfering with the normal operation of other modules or equipment. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] Figure 1 This is a structural diagram of the filter device of the utility model;
[0017] Figure 2 This is a block diagram of the input EMI filter device of the utility model;
[0018] Figure 3 This is a block diagram of the output EMI filter device of the utility model;
[0019] In the figure: 1. first differential mode filter module; 2. second differential mode filter module; 3. third differential mode filter module; 4. fourth differential mode filter module; 5. fifth differential mode filter module; 6. sixth differential mode filter module; 7. seventh differential mode filter module; 8. eighth differential mode filter module; 9. first common mode filter module; 10. second common mode filter module; 11. third common mode filter module; 12. fourth common mode filter module; 13. fifth common mode filter module; 14. sixth common mode filter module; 15. seventh common mode filter module; 16. eighth common mode filter module; 17. ninth common mode filter module; 18. tenth common mode filter module; 19. eleventh common mode filter module; 20. twelfth common mode filter module. DETAILED DESCRIPTION
[0020] 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 only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
[0021] Example:
[0022] See also Figure 1 - Figure 3 As shown, a high-power vehicle-mounted DC power supply EMI filtering device includes:
[0023] An input module, wherein the input module uses a two-stage differential mode and two-stage common mode input EMI circuit;
[0024] A power supply module, wherein the power supply module is two staggered parallel synchronous rectification BUCK power supplies;
[0025] Output module, the output module uses a two-stage common-mode output EMI circuit.
[0026] The input EM I circuit includes a first differential mode filter module 1 arranged on the positive line and a second differential mode filter module 2 arranged on the negative line, and a third differential mode filter module 3, a fourth differential mode filter module 4 and a fifth differential mode filter module 5 are arranged in parallel between the positive line and the negative line.
[0027] A first common mode filter module 9 is arranged between the third differential mode filter module 3 and the fourth differential mode filter module 4, and the positive line and the negative line are introduced from one side of the first common mode filter module 9 and led out from the other side. A second common mode filter module 10 is arranged between the fourth differential mode filter module 4 and the fifth differential mode filter module 5, and the positive line and the negative line are introduced from one side of the second common mode filter module 10 and led out from the other side. The positive pole of the third differential mode filter module 3 is connected to the third common mode filter module 11, and the negative pole of the third differential mode filter module 3 is connected to the fourth common mode filter module 12, the positive pole of the fourth differential mode filter module 4 is connected to the fifth common mode filter module 13, and the negative pole of the fourth differential mode filter module 4 is connected to the sixth common mode filter module 14.
[0028] The output EM I circuit includes a sixth differential mode filter module 6, a seventh differential mode filter module 7 and an eighth differential mode filter module 8 which are arranged in parallel on the positive line and the negative line.
[0029] A seventh common mode filter module 15 is arranged between the sixth differential mode filter module 6 and the seventh differential mode filter module 7, the positive line and the negative line are introduced from one side of the seventh common mode filter module 15 and led out from the other side, an eighth common mode filter module 16 is arranged between the seventh differential mode filter module 7 and the eighth differential mode filter module 8, the positive line and the negative line are introduced from one side of the eighth common mode filter module 16 and led out from the other side, the positive pole of the sixth differential mode filter module 6 is connected to the ninth common mode filter module 17, the negative pole of the sixth differential mode filter module 6 is connected to the tenth common mode filter module 18, the positive pole of the seventh differential mode filter module 7 is connected to the eleventh common mode filter module 19, and the negative pole of the seventh differential mode filter module 7 is connected to the twelfth common mode filter module 20.
[0030] In the description of the present utility model, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. The meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.
[0031] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.
[0032] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example" or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, unless they are contradictory.
[0033] In the drawings of the embodiments disclosed by the present invention, only the structures related to the embodiments disclosed by the present invention are involved, and other structures can refer to the general design. In the absence of conflict, the same embodiment and different embodiments of the present invention can be combined with each other.
Claims
1. A high-power vehicle-mounted DC power supply EMI filtering device, characterized in that: include: An input module, wherein the input module uses a two-stage differential mode and two-stage common mode input EMI circuit; A power supply module, wherein the power supply module is two staggered parallel synchronous rectification BUCK power supplies; The output module adopts a two-stage common-mode output EMI circuit.
2. A high-power vehicle-mounted DC power supply EMI filter device according to claim 1, characterized in that: The input EMI circuit comprises a first differential mode filter module (1) arranged on a positive line and a second differential mode filter module (2) arranged on a negative line, and a third differential mode filter module (3), a fourth differential mode filter module (4) and a fifth differential mode filter module (5) are arranged in parallel between the positive line and the negative line.
3. A high-power vehicle-mounted DC power supply EMI filter device according to claim 2, characterized in that: A first common mode filter module (9) is arranged between the third differential mode filter module (3) and the fourth differential mode filter module (4), the positive line and the negative line are introduced from one side of the first common mode filter module (9) and led out from the other side, a second common mode filter module (10) is arranged between the fourth differential mode filter module (4) and the fifth differential mode filter module (5), the positive line and the negative line are introduced from one side of the second common mode filter module (10) and led out from the other side, the positive pole of the third differential mode filter module (3) is connected to the third common mode filter module (11), the negative pole of the third differential mode filter module (3) is connected to the fourth common mode filter module (12), the positive pole of the fourth differential mode filter module (4) is connected to the fifth common mode filter module (13), and the negative pole of the fourth differential mode filter module (4) is connected to the sixth common mode filter module (14).
4. A high-power vehicle-mounted DC power supply EMI filter device according to claim 3, characterized in that: The output EMI circuit comprises a sixth differential mode filter module (6), a seventh differential mode filter module (7) and an eighth differential mode filter module (8) which are arranged in parallel on the positive line and the negative line.
5. A high-power vehicle-mounted DC power supply EMI filter device according to claim 4, characterized in that: A seventh common mode filter module (15) is arranged between the sixth differential mode filter module (6) and the seventh differential mode filter module (7), the positive line and the negative line are introduced from one side of the seventh common mode filter module (15) and led out from the other side, an eighth common mode filter module (16) is arranged between the seventh differential mode filter module (7) and the eighth differential mode filter module (8), the positive line and the negative line are introduced from one side of the eighth common mode filter module (16) and led out from the other side, the positive pole of the sixth differential mode filter module (6) is connected to the ninth common mode filter module (17), the negative pole of the sixth differential mode filter module (6) is connected to the tenth common mode filter module (18), the positive pole of the seventh differential mode filter module (7) is connected to the eleventh common mode filter module (19), and the negative pole of the seventh differential mode filter module (7) is connected to the twelfth common mode filter module (20).