CN203135807U - Anti-interference combined filter - Google Patents
Anti-interference combined filter Download PDFInfo
- Publication number
- CN203135807U CN203135807U CN 201320013888 CN201320013888U CN203135807U CN 203135807 U CN203135807 U CN 203135807U CN 201320013888 CN201320013888 CN 201320013888 CN 201320013888 U CN201320013888 U CN 201320013888U CN 203135807 U CN203135807 U CN 203135807U
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- inductance
- filter
- capacitor
- direct current
- parallel
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Abstract
The utility model discloses an anti-interference combined filter comprising a DC branch circuit (1) and an AC branch circuit (2) in a parallel manner, and the filter is characterized in that the AC branch circuit is added with filter inductors. The beneficial effects are that the filter can effectively prevent AC-DC interference mutual crosstalk, and electromagnetic compatibility of the system is improved.
Description
Technical field
The utility model relates to a kind of electric device, particularly a kind of filter.
Background technology
Filter (filter) is a kind of device that is used for eliminating electronic jamming, obtains pure direct current with inputing or outputing through filtration.To the circuit that frequency or the frequency beyond this frequency of characteristic frequency are carried out effective filtering, be exactly filter, its function obtains a characteristic frequency exactly or eliminates a characteristic frequency.
Filter generally has two ports, an input signal, an output signal.
Filter is the networking that is made of inductor and capacitor, can make the ac and dc current of mixing separately.In the power rectifier, namely filter ripple in the clean pulsating direct current by this networking, and obtain purer direct current output.The most basic filter is to be made of a capacitor and an inductor, is called the filtering of L type.The filter that all are various all is that set L type single-section filter forms.Basic single-unit formula filter is made up of a series arm and a parallel arm, and series arm is inductor, and parallel arm is capacitor.
Also there are some flaws in the filter product of prior art in the actual use:
1, the shield gasket performance is not high, and part frequency electromagnetic compatibility conduction test has the phenomenon that exceeds standard;
2, because the most material of filter is metallic conductor, its density is higher, causes final products heavier, and is more stable usually in the use of some permanent plants; But move at some, especially in the equipment of high-speed mobile, cause easily to come off, cause operational failure.
3, job insecurity on powerful device, the electric current that can bear is less.
4, filter effect is bad when frequency ratio is higher, promotes difficulty.
Therefore, need to improve existing filter.
Summary of the invention
Goal of the invention of the present utility model is: at the problem of above-mentioned existence, provide a kind of mode of setting up filter inductance at the interchange branch road of circuit, prevent that alternating current-direct current from crosstalking mutually, improve the Electro Magnetic Compatibility of system.
The technical solution adopted in the utility model is such:
A kind of anti-interference junction filter comprises capacitor and inductor, and capacitor and inductor are installed on the direct current branch, with direct current branch parallel exchange branch road in addition, it is characterized in that: be provided with inductor at described interchange branch road.
Further, the inductor that exchanges on the branch road is preferably its induction reactance between 5mH-10mH.
Further, described direct current branch is made of parallel arm and series arm, and parallel arm is capacitor, and series arm is inductor.
Further, be connected to inductance and inductance on circuit of described series arm, be connected to inductance on another circuit; Parallel arm has three electric capacity and two electric capacity to constitute, and three electric capacity are connected between inductance and the inductance respectively and both sides, and two electric capacity strings are connected in parallel on the left side of inductance together, two electric capacity centre position ground connection.
In sum, owing to adopted technique scheme, the beneficial effects of the utility model are:
1, prevented effectively that alternating current-direct current from disturbing and crosstalked mutually, improved the Electro Magnetic Compatibility of system.
Description of drawings
Fig. 1 is circuit diagram of the present utility model.
Mark among the figure: 1 is direct current branch, and 2 for exchanging branch road.
Embodiment
Below in conjunction with accompanying drawing, the utility model is done detailed explanation.
In order to make the purpose of this utility model, technical scheme and advantage clearer, below in conjunction with drawings and Examples, the utility model is further elaborated.Should be appreciated that specific embodiment described herein only in order to explaining the utility model, and be not used in restriction the utility model.
Embodiment 1:
As shown in Figure 1, a kind of anti-interference junction filter comprises direct current branch 1 and exchanges branch road 2 that wherein direct current branch 1 is made up of series arm and parallel arm, and parallel arm is capacitor, and series arm is inductor; Be provided with inductor L4 at the interchange branch road.The induction reactance of inductor L4 is 5mH.
The beneficial effect of present embodiment is: having prevented effectively that alternating current-direct current from disturbing crosstalks mutually; Improved Electro Magnetic Compatibility.
Embodiment 2:
On the basis of embodiment 1, change the induction reactance of inductor L4 into 10mH, and, be connected to inductance L 1 and inductance L 2 on circuit of described series arm, be connected to inductance L 3 on another circuit; Parallel arm has three capacitor C 1 and two capacitor C 2 to constitute, and three capacitor C 1 are connected between inductance L 1 and the inductance L 2 respectively and both sides, and two capacitor C 2 strings are connected in parallel on the left side of inductance L 2, two capacitor C 2 centre position ground connection together.
The beneficial effect of present embodiment is: the Electro Magnetic Compatibility that has further improved filter.
The above only is preferred embodiment of the present utility model; not in order to limit the utility model; all any modifications of within spirit of the present utility model and principle, doing, be equal to and replace and improvement etc., all should be included within the protection range of the present utility model.
Claims (4)
1. an anti-interference junction filter comprises direct current branch (1) and exchanges branch road (2), and direct current branch (1) is characterized in that with to exchange branch road (2) parallel: be equipped with filter inductance L4 exchanging branch road.
2. anti-interference junction filter according to claim 1 is characterized in that: the anti-5mH-10mH of the inductance of described filter inductance.
3. anti-interference junction filter according to claim 1, it is characterized in that: described direct current branch (1) is made of parallel arm and series arm, and parallel arm is capacitor, and series arm is inductor.
4. anti-interference junction filter according to claim 3 is characterized in that: be connected to inductance L 1 and inductance L 2 on circuit of described series arm, be connected to inductance L 3 on another circuit; Parallel arm has three capacitor C 1 and two capacitor C 2 to constitute, and three capacitor C 1 are connected between inductance L 1 and the inductance L 2 respectively and both sides, and two capacitor C 2 strings are connected in parallel on the left side of inductance L 2, two capacitor C 2 centre position ground connection together.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320013888 CN203135807U (en) | 2013-01-11 | 2013-01-11 | Anti-interference combined filter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320013888 CN203135807U (en) | 2013-01-11 | 2013-01-11 | Anti-interference combined filter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203135807U true CN203135807U (en) | 2013-08-14 |
Family
ID=48943744
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320013888 Expired - Fee Related CN203135807U (en) | 2013-01-11 | 2013-01-11 | Anti-interference combined filter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203135807U (en) |
-
2013
- 2013-01-11 CN CN 201320013888 patent/CN203135807U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130814 Termination date: 20180111 |