CN202798611U - Common module filter circuit - Google Patents
Common module filter circuit Download PDFInfo
- Publication number
- CN202798611U CN202798611U CN 201220480398 CN201220480398U CN202798611U CN 202798611 U CN202798611 U CN 202798611U CN 201220480398 CN201220480398 CN 201220480398 CN 201220480398 U CN201220480398 U CN 201220480398U CN 202798611 U CN202798611 U CN 202798611U
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- China
- Prior art keywords
- common mode
- circuit
- common module
- signal isolation
- filter circuit
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Abstract
The utility model discloses a common module filter circuit, which comprises two common module capacitances and an unbalanced transformer, wherein the two common module capacitances are connected between two output ends of the unbalanced transformer after being connected with the common module capacitances in series. The common module filter circuit further comprises a signal isolation circuit, wherein one end of the signal isolation circuit is connected with a connecting point of the two common module capacitances, and the other end of the signal isolation circuit is connected with the ground. The common module filter circuit can meet work requirement of mid-high frequency.
Description
Technical field
The utility model belongs to electronic circuit field, particularly a kind of filter circuit construction.
Background technology
Common mode filtering circuit is a kind of low-frequency filter circuit, generally comprise common mode capacitance (Y electric capacity) and balun, utilize common mode capacitance that the common mode current of input line is switched to the earth, yet, in actual use, input current comprises noise inevitably, and the work of circuit is produced immeasurable impact.
The utility model content
The purpose of this utility model is to provide a kind of common mode filtering circuit, and it can satisfy the job requirement of medium-high frequency section.
In order to reach above-mentioned purpose, solution of the present utility model is:
A kind of common mode filtering circuit comprises two common mode capacitance and balun, after described two common mode capacitance are connected mutually, is connected between two outputs of balun; Also comprise signal isolation circuit, an end of described buffer circuit connects the tie point of two common mode capacitance, other end ground connection.
Above-mentioned signal isolation circuit adopts inductance.
Above-mentioned signal isolation circuit adopts electric capacity.
After adopting such scheme, the utility model is by increasing signal isolation circuit in the available circuit structure, and noise satisfies the job requirement of medium-high frequency section to the adverse effect of circuit in the inhibition input circuit.
Description of drawings
Fig. 1 is circuit structure diagram of the present utility model.
Embodiment
Below with reference to accompanying drawing, the technical solution of the utility model and beneficial effect are elaborated.
As shown in Figure 1, the utility model provides a kind of common mode filtering circuit, comprises two common mode capacitance C1, C2 and balun T, after described common mode capacitance C1, C2 connect mutually, be connected between two outputs of balun T, this repeats no more for existing basic structure.
Improvement of the present utility model is: also include signal isolation circuit, one end of described buffer circuit connects the tie point of described common mode capacitance C1, C2, other end ground connection, thereby the noise in the inhibition input current is on the impact of circuit, signal isolation circuit can adopt arbitrary structures of the prior art herein, such as independently electronic devices and components inductance, electric capacity, or the circuit that is formed by connecting by inductance, capacitor combination.
Above embodiment only is explanation technological thought of the present utility model; can not limit protection range of the present utility model with this; every technological thought according to the utility model proposes, any change of doing on the technical scheme basis all falls within the utility model protection range.
Claims (3)
1. a common mode filtering circuit comprises two common mode capacitance and balun, after described two common mode capacitance are connected mutually, is connected between two outputs of balun; It is characterized in that: also comprise signal isolation circuit, an end of described buffer circuit connects the tie point of two common mode capacitance, other end ground connection.
2. a kind of common mode filtering circuit as claimed in claim 1 is characterized in that: described signal isolation circuit employing inductance.
3. a kind of common mode filtering circuit as claimed in claim 1 is characterized in that: described signal isolation circuit employing electric capacity.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220480398 CN202798611U (en) | 2012-09-20 | 2012-09-20 | Common module filter circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220480398 CN202798611U (en) | 2012-09-20 | 2012-09-20 | Common module filter circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202798611U true CN202798611U (en) | 2013-03-13 |
Family
ID=47825780
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220480398 Expired - Fee Related CN202798611U (en) | 2012-09-20 | 2012-09-20 | Common module filter circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202798611U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102868380A (en) * | 2012-09-20 | 2013-01-09 | 无锡莱吉特信息科技有限公司 | Common-mode filter circuit |
-
2012
- 2012-09-20 CN CN 201220480398 patent/CN202798611U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102868380A (en) * | 2012-09-20 | 2013-01-09 | 无锡莱吉特信息科技有限公司 | Common-mode filter circuit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130313 Termination date: 20130920 |