Differential mode and common mode integrated filter
By designing integrated differential-mode and common-mode filters, and connecting multiple stages of filter circuits in series with staggered spacing, the problem of electromagnetic interference signals affecting the circuit was solved. This achieved effective suppression of differential-mode and common-mode interference signals and current stability, demonstrating promising application prospects.
Patent Information
- Application Number
- CN202520126584.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-20
- Publication Date
- 2026-01-16
- Estimated Expiration
- 2035-01-20
AI Technical Summary
In electronic devices such as switching power supplies, electromagnetic interference signals affect the normal operation of circuits and pollute the electromagnetic environment. Existing technologies are unable to effectively suppress the conduction and radiation of differential-mode and common-mode interference signals.
Design a differential-mode and common-mode integrated filter. Enhance the filtering effect by connecting multiple stages of differential-mode and common-mode filter circuits in series and using a cross-interval setting.
It effectively suppresses differential and common-mode interference signals in the circuit, ensures current stability and power supply regulation, prevents power supply fluctuations, and has broad application prospects.
Smart Images
Figure CN223809703U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the technical field of filter circuit structure, in particular to a differential mode and common mode integrated filter. BACKGROUND
[0002] At present, in the electronic devices (such as switching power supply, uninterruptible power supply, frequency converter, television, computer, etc.) applying switching power supply, since the circuit of the above-mentioned electronic device works in switching state, electromagnetic interference signals are inevitably generated, these interference signals are divided into two cases of conduction and radiation, and the conduction interference signals are divided into differential mode and common mode interference signals, these interference signals not only affect the normal work of the circuit itself, but also enter the power grid in the form of conduction and radiation, pollute the electromagnetic environment, and further affect the normal work of other electrical appliances; at the same time, electromagnetic interference signals also exist in the power grid, which will also enter the equipment in the form of conduction or radiation, and affect the normal work, so measures must be taken to suppress these interference signals. CONTENT OF THE INVENTION
[0003] In order to solve the above technical problems, the embodiment of the present application provides a differential mode and common mode integrated filter, which comprises a plurality of differential mode filter circuits and a plurality of common mode filter circuits connected in series, and the differential mode filter circuits and the common mode filter circuits are arranged at intervals.
[0004] In some embodiments, the differential mode filter circuit comprises a first differential mode filter circuit, a second differential mode filter circuit, a third differential mode filter circuit and a fourth differential mode filter circuit, the common mode filter circuit comprises a first common mode filter circuit, a second common mode filter circuit and a third common mode filter circuit, and the first differential mode filter circuit, the first common mode filter circuit, the second differential mode filter circuit, the second common mode filter circuit, the third differential mode filter circuit, the third common mode filter circuit and the fourth differential mode filter circuit are connected in series.
[0005] In some embodiments, the first differential mode filter circuit comprises a first electrolytic capacitor, a second electrolytic capacitor and a first general capacitor connected in parallel.
[0006] In some embodiments, the first common mode filter circuit comprises a second general capacitor, a third general capacitor and a first common mode inductor, the second general capacitor and the third general capacitor are connected in parallel, the second general capacitor and the third general capacitor connected in parallel are connected in series with the first common mode inductor, and the common end of the second general capacitor and the third general capacitor connected in parallel is grounded.
[0007] In some embodiments, the second differential mode filter circuit comprises a fourth general capacitor and a third electrolytic capacitor connected in parallel.
[0008] In some embodiments, the second common mode filter circuit comprises a fifth general capacitor, a sixth general capacitor, and a second common mode inductor, the fifth general capacitor and the sixth general capacitor are connected in parallel, and the fifth general capacitor and the sixth general capacitor connected in parallel are connected in series with the second common mode inductor, and the common end of the fifth general capacitor and the sixth general capacitor connected in parallel is grounded.
[0009] In some embodiments, the third differential mode filter circuit comprises a seventh general capacitor.
[0010] In some embodiments, the third common mode filter circuit comprises an eighth general capacitor, a ninth general capacitor, a fourth electrolytic capacitor, and a third common mode inductor, the eighth general capacitor, the ninth general capacitor, and the fourth electrolytic capacitor are connected in parallel, and the eighth general capacitor, the ninth general capacitor, and the fourth electrolytic capacitor connected in parallel are connected in series with the third common mode inductor, and the common end of the eighth general capacitor and the ninth general capacitor connected in parallel is grounded.
[0011] In some embodiments, the fourth differential mode filter circuit comprises a tenth general capacitor, a fifth electrolytic capacitor, a sixth electrolytic capacitor, and a seventh electrolytic capacitor connected in parallel.
[0012] Compared with the prior art, the differential mode and common mode integrated filter provided by the present application can simultaneously filter the differential mode interference signal and the common mode interference signal in the circuit by connecting the multi-stage differential mode filter circuit and the multi-stage common mode filter circuit in series, and further enhances the filtering effect of the common mode interference signal and the differential mode interference signal based on the cross interval arrangement of the common mode filter circuit and the differential mode filter circuit, which has a wide application prospect. BRIEF DESCRIPTION OF DRAWINGS
[0013] Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the embodiments. The accompanying drawings are included only serving the purpose of illustrating some embodiments and are not considered as limiting the present application. Moreover, the same reference numbers in all the drawings represent the same or similar components. In the drawings:
[0014] Figure 1 The circuit structure schematic diagram of the differential mode and common mode integrated filter in some embodiments of the present application is shown.
[0015] The reference numbers in the detailed description of the embodiments are as follows:
[0016] 111. first electrolytic capacitor
[0017] 112. second electrolytic capacitor
[0018] 113. first general capacitor
[0019] 121. fourth general capacitor
[0020] 122. Third electrolytic capacitor
[0021] 131. Seventh general capacitor
[0022] 141. Tenth general capacitor
[0023] 142. Fifth electrolytic capacitor
[0024] 143. Sixth electrolytic capacitor
[0025] 144. Seventh electrolytic capacitor
[0026] 211. Second general capacitor
[0027] 212. Third general capacitor
[0028] 213. First common mode inductor
[0029] 221. Fifth general capacitor
[0030] 222. Sixth general capacitor
[0031] 223. Second common mode inductor
[0032] 231. Eighth general capacitor
[0033] 232. Ninth general capacitor
[0034] 233. Fourth electrolytic capacitor
[0035] 234. Third common mode inductor. DETAILED DESCRIPTION
[0036] In the description of the present application, it is to be understood that the descriptions of relative position or orientation such as central, longitudinal, lateral, length, width, thickness, upper, lower, front, back, left, right, vertical, horizontal, top, bottom, inner, outer, clockwise, counterclockwise, axial, radial, circumferential, etc. are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.
[0037] In the present application, unless specifically defined and limited otherwise, the terms "mount", "connected", "connection", "fixed", etc. should be understood broadly. For example, it can be fixedly connected, or detachably connected, or integrated; it can be mechanically connected, or electrically connected, it can be directly connected, or indirectly connected through an intermediate medium, or it can be the communication or interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.
[0038] In the description of the present application, the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" mean that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present application, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any appropriate manner in any one or more embodiments or examples. In addition, those skilled in the art can combine and combine the different embodiments or examples described in the present application and the features of the different embodiments or examples without contradiction.
[0039] It should be noted that in the drawings of the present application, PE represents a common termination ground; GND (Ground) represents the most common ground, which is generally considered as the reference ground in the circuit; DGND (Digital Ground) represents the digital ground, which is usually used on the digital circuit; AGND (Analog Ground) represents the analog ground, which is usually used on the analog circuit. In circuit design, the digital ground and the analog ground should be isolated to prevent mutual interference. Among them, the electrolytic capacitor has polarity, and the ordinary capacitor has no polarity.
[0040] To solve the technical problems existing in the related art, the embodiments of the present application provide a differential mode and common mode integrated filter. Referring to Figure 1 The differential mode and common mode integrated filter of some embodiments of the present application includes a plurality of differential mode filter circuits and a plurality of common mode filter circuits connected in series, and the differential mode filter circuits and the common mode filter circuits are arranged at intervals.
[0041] In the above embodiment, by connecting multiple differential mode filter circuits and multiple common mode filter circuits in series, the differential mode interference signal and the common mode interference signal in the circuit can be filtered at the same time. At the same time, based on the cross-interval arrangement of the common mode filter circuit and the differential mode filter circuit, the filtering effect of the common mode interference signal and the differential mode interference signal is further enhanced, which has a wide application prospect.
[0042] In some embodiments, the differential mode filter circuit includes a first differential mode filter circuit, a second differential mode filter circuit, a third differential mode filter circuit, and a fourth differential mode filter circuit, the common mode filter circuit includes a first common mode filter circuit, a second common mode filter circuit, and a third common mode filter circuit, and the first differential mode filter circuit, the first common mode filter circuit, the second differential mode filter circuit, the second common mode filter circuit, the third differential mode filter circuit, the third common mode filter circuit, and the fourth differential mode filter circuit are connected in series.
[0043] In the above embodiment, the first differential mode filter circuit includes a first electrolytic capacitor 111, a second electrolytic capacitor 112, and a first general capacitor 113 connected in parallel, and the first differential mode filter circuit formed based on the first electrolytic capacitor 111, the second electrolytic capacitor 112, and the first general capacitor 113 connected in parallel can filter out part of high frequency in the circuit, thereby realizing preliminary filtering.
[0044] The first common mode filter circuit includes a second general capacitor 211, a third general capacitor 212, and a first common mode inductor 213, the second general capacitor 211 and the third general capacitor 212 are connected in parallel, the second general capacitor 211 and the third general capacitor 212 connected in parallel are connected in series with the first common mode inductor 213, and the common end of the second general capacitor 211 and the third general capacitor 212 connected in parallel is grounded, the first common mode filter circuit is used to perform one-time suppression filtering on the common mode interference signal on the power line, so as to ensure that the current is more pure and stable.
[0045] The second differential mode filter circuit includes a fourth general capacitor 121 and a third electrolytic capacitor 122 connected in parallel, and the second differential mode filter circuit formed based on the fourth general capacitor 121 and the third electrolytic capacitor 122 connected in parallel further filters out the differential mode interference in the circuit.
[0046] The second common mode filter circuit includes a fifth general capacitor 221, a sixth general capacitor 222, and a second common mode inductor 223, the fifth general capacitor 221 and the sixth general capacitor 222 are connected in parallel, the fifth general capacitor 221 and the sixth general capacitor 222 connected in parallel are connected in series with the second common mode inductor 223, and the common end of the fifth general capacitor 221 and the sixth general capacitor 222 connected in parallel is grounded, the second common mode filter circuit is used to perform two-time suppression filtering on the common mode interference signal on the power line, thereby further ensuring that the current is more pure and stable.
[0047] The third differential mode filter circuit includes a seventh general capacitor 131, and the third differential mode filter circuit is used to filter out high-frequency IC filtering.
[0048] The third common-mode filter circuit comprises an eighth general capacitor 231, a ninth general capacitor 232, a fourth electrolytic capacitor 233 and a third common-mode inductor 234, the eighth general capacitor 231, the ninth general capacitor 232 and the fourth electrolytic capacitor 233 are connected in parallel, the eighth general capacitor 231, the ninth general capacitor 232 and the fourth electrolytic capacitor 233 connected in parallel are connected in series with the third common-mode inductor 234, and the common end of the eighth general capacitor 231 and the ninth general capacitor 232 connected in parallel is grounded. Based on the third common-mode filter circuit, not only the simple stage filtering effect can be realized, but also the voltage stabilizing effect can be provided when the product is powered, so as to prevent the power fluctuation caused by the instantaneous current change of the power supply.
[0049] The fourth differential-mode filter circuit comprises a tenth general capacitor 141, a fifth electrolytic capacitor 142, a sixth electrolytic capacitor 143 and a seventh electrolytic capacitor 144 connected in parallel. Based on the fourth common-mode filter circuit, not only the simple stage filtering effect can be realized, but also the voltage stabilizing effect can be provided when the product is powered, so as to prevent the power fluctuation caused by the instantaneous current change of the power supply.
[0050] In the above embodiment, by adopting the cross interval arrangement of the four-stage differential-mode filter circuit and the three-stage common-mode filter circuit, the differential-mode interference signal and the common-mode interference signal in the circuit can be effectively filtered, so that the electronic equipment can work normally, and has good application prospect.
[0051] The above describes in detail the differential-mode and common-mode integrated filter provided by the present application. The principle and implementation mode of the present application are described by applying specific examples, and the above embodiment is only used to help understand the core idea of the present application. It should be pointed out that, for ordinary skilled persons in the technical field, some improvements and modifications can be made to the present application without departing from the principle of the present application, and these improvements and modifications also fall within the protection scope of the present application.
Claims
1. A differential mode and common mode integrated filter, characterized by, The differential mode filter circuit and the common mode filter circuit are arranged in series, and the differential mode filter circuit comprises a first differential mode filter circuit, a second differential mode filter circuit, a third differential mode filter circuit and a fourth differential mode filter circuit, and the common mode filter circuit comprises a first common mode filter circuit, a second common mode filter circuit and a third common mode filter circuit, and the first differential mode filter circuit, the first common mode filter circuit, the second differential mode filter circuit, the second common mode filter circuit, the third differential mode filter circuit, the third common mode filter circuit and the fourth differential mode filter circuit are connected in series.
2. The differential mode and common mode integrated filter of claim 1, wherein, The first differential mode filter circuit comprises a first electrolytic capacitor, a second electrolytic capacitor and a first general capacitor connected in parallel.
3. The differential mode and common mode integrated filter of claim 1, wherein, The first common mode filter circuit comprises a second general capacitor, a third general capacitor and a first common mode inductor, the second general capacitor and the third general capacitor are connected in parallel, and the second general capacitor and the third general capacitor connected in parallel are connected in series with the first common mode inductor, and the common end of the second general capacitor and the third general capacitor connected in parallel is grounded.
4. The differential mode and common mode integrated filter of claim 3, wherein, The second differential mode filter circuit comprises a fourth general capacitor and a third electrolytic capacitor connected in parallel.
5. The differential mode and common mode integrated filter of claim 4, wherein, The second common mode filter circuit comprises a fifth general capacitor, a sixth general capacitor and a second common mode inductor, the fifth general capacitor and the sixth general capacitor are connected in parallel, and the fifth general capacitor and the sixth general capacitor connected in parallel are connected in series with the second common mode inductor, and the common end of the fifth general capacitor and the sixth general capacitor connected in parallel is grounded.
6. The differential mode and common mode integrated filter of claim 5, wherein, The third differential mode filter circuit comprises a seventh general capacitor.
7. The differential mode and common mode integrated filter of claim 6, wherein, The third common mode filter circuit comprises an eighth general capacitor, a ninth general capacitor, a fourth electrolytic capacitor and a third common mode inductor, the eighth general capacitor, the ninth general capacitor and the fourth electrolytic capacitor are connected in parallel, and the eighth general capacitor, the ninth general capacitor and the fourth electrolytic capacitor connected in parallel are connected in series with the third common mode inductor, and the common end of the eighth general capacitor and the ninth general capacitor connected in parallel is grounded.
8. The differential mode and common mode integrated filter of claim 7, wherein, The fourth differential mode filter circuit comprises a tenth general capacitor, a fifth electrolytic capacitor, a sixth electrolytic capacitor and a seventh electrolytic capacitor connected in parallel.