EMC filter circuit
By employing a specific combination of capacitors and inductors in the motor driver, the problem of poor EMC filtering performance in existing technologies is solved, and better electromagnetic compatibility performance is achieved.
Patent Information
- Application Number
- CN202423016624.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-06
- Publication Date
- 2026-02-13
- Estimated Expiration
- 2034-12-06
AI Technical Summary
Existing EMC filtering circuits are ineffective and cannot effectively improve the electromagnetic compatibility performance of motor drivers.
An EMC filter circuit structure with a specific combination of capacitors and inductors is adopted, wherein four first capacitors, two second capacitors, two third capacitors and two fourth capacitors are connected in series on both sides of the motor, and the other two first capacitors, common mode inductor and common mode capacitor are connected in parallel on both sides of the motor, and all capacitors are grounded and connected to the motor housing.
It improves the electromagnetic compatibility of the motor driver and enhances the ability to suppress electromagnetic interference.
Smart Images
Figure CN223912426U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to motor drive field especially relates to a EMC filter circuit. BACKGROUND
[0002] Motor driver generally needs to set up EMC filter circuit to realize electromagnetic compatibility when working, but the prior art's EMC filter circuit is simple, only two capacitors are connected in series on the both sides of motor and two capacitors are connected in parallel, so that the overall effect of the EMC filter circuit is poor. SUMMARY
[0003] The utility model provides a EMC filter circuit with better effect.
[0004] The utility model employs the technical scheme of: a EMC filter circuit, it includes motor, it still includes four first capacitors, two second capacitors, two third capacitors, two fourth capacitors, a common mode inductance and a common mode capacitor, wherein two first capacitors, two second capacitors, two third capacitors and two fourth capacitors are connected in series on the both sides of motor, and the other two first capacitors, a common mode inductance and a common mode capacitor are connected in parallel on the both sides of motor.
[0005] As preferred, the first capacitor is 470NF, the second capacitor is 470PF, the third capacitor is 20PF, and the fourth capacitor is 3PF.
[0006] As preferred, the both sides of the motor further have LRC filter circuits connected in series respectively.
[0007] As preferred, the model of the LRC filter circuit is BTREF2012A3R331V.
[0008] As preferred, the other two first capacitors, a common mode inductance and a common mode capacitor are connected in parallel on the both sides of the circuit composed of the motor and two LRC filter circuits.
[0009] As preferred, the ground of the first capacitor, the second capacitor, the third capacitor, the fourth capacitor and the common mode capacitor is connected on the motor shell.
[0010] As preferred, the model of the common mode inductance is BWMF702P132P2A5V, and the model of the common mode capacitor is BCCF3216V100C502.
[0011] Compared with the prior art, the utility model has the following advantages: the EMC filter circuit with the structure has better overall electromagnetic compatibility effect. BRIEF DESCRIPTION OF DRAWINGS
[0012] Figure 1 This is a circuit diagram of an EMC filter circuit according to this utility model. Detailed Implementation
[0013] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model.
[0014] Example 1:
[0015] An EMC filter circuit includes a motor, a first capacitor, a second capacitor, a third capacitor, a fourth capacitor, a common-mode inductor, and a common-mode capacitor, wherein:
[0016] There are four first capacitors, each with a specification of 470NF;
[0017] There are two second capacitors, each with a specification of 470pF;
[0018] There are two third capacitors, each with a specification of 20pF;
[0019] There are two fourth capacitors, each with a specification of 3pF;
[0020] There is one common mode inductor, which is a BWMF702P132P2A5V common mode inductor manufactured by Bichuangda.
[0021] There is one common-mode capacitor, which is a BCCF3216V100C502 common-mode capacitor manufactured by Bichuangda.
[0022] like Figure 1 As shown, two first capacitors, two second capacitors, two third capacitors, and two fourth capacitors are connected in series on both sides of the motor. The other two first capacitors, common mode inductor, and common mode capacitor are connected in parallel on both sides of the motor. All capacitors and the ground of the common mode capacitor are connected to the motor housing.
[0023] Example 2:
[0024] The difference from the embodiment one is that two LRC filter circuits are further included in the embodiment two, which are BTREF2012A3R331V LRC filter circuits produced by BIDADA, and the two LRC filter circuits are connected in series on the two sides of the motor, that is, one side of one LRC filter circuit is connected with the positive electrode of the motor, and the other side is connected with one side of one first capacitor connected in series, one side of the other LRC filter circuit is connected with the negative electrode of the motor, and the other side is connected with one side of the other first capacitor connected in series; and the two LRC filter circuits and the motor form a combined circuit, and the other two first capacitors, the common-mode inductor and the common-mode capacitor are connected in parallel on the two ends of the combined circuit.
[0025] Although the embodiments of the utility model have been shown and described above, it can be understood that the above-mentioned embodiments are exemplary and cannot be understood as limiting the utility model, and the ordinary skilled in the art can change, modify, replace and transform the above-mentioned embodiments within the scope of the utility model.
[0026] For those skilled in the art, after reading the above description, various changes and modifications will undoubtedly be apparent. Therefore, the appended claims should be considered as covering all changes and modifications within the true intent and scope of the utility model. Any and all equivalent ranges and contents within the scope of the claims should be considered as still belonging to the intent and scope of the utility model.
Claims
1. An EMC filter circuit comprising a motor, characterised in that: It also includes four first capacitors, two second capacitors, two third capacitors, two fourth capacitors, a common mode inductor and a common mode capacitor, wherein two first capacitors, two second capacitors, two third capacitors and two fourth capacitors are connected in series on both sides of the motor, and the other two first capacitors, a common mode inductor and a common mode capacitor are connected in parallel on both sides of the motor.
2. An EMC filter circuit according to claim 1, characterised in that: The first capacitor is 470NF, the second capacitor is 470PF, the third capacitor is 20PF, and the fourth capacitor is 3PF.
3. An EMC filter circuit according to claim 1, characterised in that: The motor is also connected with an LRC filter circuit in series on both sides.
4. An EMC filter circuit according to claim 3, characterised in that: The model of the LRC filter circuit is BTREF2012A3R331V.
5. An EMC filter circuit as claimed in claim 3, characterised in that: The other two first capacitors, a common mode inductor and a common mode capacitor are connected in parallel on both sides of the circuit composed of the motor and two LRC filter circuits.
6. An EMC filter circuit according to claim 1, characterised in that: The ground of the first capacitor, the second capacitor, the third capacitor, the fourth capacitor and the common mode capacitor is connected to the motor shell.
7. An EMC filter circuit according to claim 1, characterised in that: The model of the common mode inductor is BWMF702P132P2A5V, and the model of the common mode capacitor is BCCF3216V100C502.