CN204928574U - Anti -electromagnetic interference filter circuit - Google Patents
Anti -electromagnetic interference filter circuit Download PDFInfo
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- CN204928574U CN204928574U CN201520748787.XU CN201520748787U CN204928574U CN 204928574 U CN204928574 U CN 204928574U CN 201520748787 U CN201520748787 U CN 201520748787U CN 204928574 U CN204928574 U CN 204928574U
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Abstract
The utility model relates to an anti -electromagnetic interference filter circuit, be in including casing and setting input connector on the casing connects with output, locates power switching over part and filter circuit in the casing, its characterized in that: filter circuit include punching wave filter, first wave filter and second wave filter, input connector pass through the punching wave filter and be connected with the input of first wave filter, first wave filter passes through the second wave filter to be connected with the input of power switching over part, power switching over part output and output articulate. The utility model aims at providing an anti -electromagnetic interference filter circuit, the integrated level is high, small, multiple functional, has realized input, output port electromagnetic compatibility, guarantees power switching over part input voltage's stability, reduces the electromagnetic interference influence that entire system received.
Description
Technical field
The utility model relates to wave filter technology field, is specifically related to a kind of filter circuit of electromagnetism interference.
Background technology
Filter is as the equipment by the noise signal filtering in circuit, be widely used in electronic equipment of various, special procure in field at communication equipment, Aero-Space, on-board equipment etc., electromagnetic environment bandwidth, field intensity is large, and can what the Electro Magnetic Compatibility height of power conversion parts directly had influence on other equipment in environment safety, reliability service.The filter circuit that power-supply filter is made up of electric capacity, inductance and resistance, the function of power-supply filter, exactly by accessing power-supply filter in power line, obtains the power supply signal of a characteristic frequency, or eliminates the power supply signal after a characteristic frequency.Power-supply filter is a kind of passive bidirectional network, and its one end is power supply, and the other end is load.The principle of power-supply filter is exactly a kind of impedance network: the impedance of power-supply filter input, output and power supply and load end is larger, more effective to the decay of electromagnetic interference.Filter can carry out effective filtering to the frequency beyond the frequency of characteristic frequency in power line or this frequency, obtains the power supply signal of a characteristic frequency, or eliminates the power supply signal after a characteristic frequency, to meet the power supply requirement of different characteristic frequency.The filter circuit of traditional electromagnetism interference is that the Power convert parts welded are loaded in housing, then glue embedding is used, realize power source conversion function, access power-supply filter again, to reach the object of electromagnetic compatibility, but enrich due to the frequency spectrum on power delivery wire, easily produce larger coupling and radiation interference signals, the signal exported from filter will be subject to electromagnetic interference the process being transferred to Power convert parts, is difficult to realize filtering object.In the filter circuit of traditional electromagnetism interference, Power convert parts and filter circuit are divided into two parts, and volume is comparatively large, and integrated level is low, function singleness, add the electromagnetic interference influence that the Power convert parts that are positioned at filter circuit outside bring for whole system.
Utility model content
The purpose of this utility model is to provide a kind of filter circuit of electromagnetism interference, integrated level is high, volume is little, multiple functional, achieve input, output port electromagnetic compatibility, ensure the stable of Power convert parts input voltage, reduce the electromagnetic interference influence that whole system is subject to.
The purpose of this utility model realizes by the following technical solutions, it comprises housing and arranges input adapter on the housing and out splice going splice, be located at the Power convert parts in described housing and filter circuit, described filter circuit comprises punching filter, the first filter and the second filter, described input adapter is connected with the input of the first filter by punching filter, first filter is connected with the input of Power convert parts by the second filter, and Power convert element outputs is connected with out splice going splice.
Operation principle of the present utility model: the low-pass filter circuit that this circuit is made up of inductance and electric capacity, it allows direct current or alternating current to pass through, the interference signal higher to frequency then has larger decay, because interference signal has differential mode and common mode two kinds, this circuit will have attenuation to two kinds of interference, the electric capacity mainly filtering differential mode interference signal of cross-over connection both positive and negative polarity in circuit, direct-to-ground capacitance mainly filtering common mode interference.What this circuit adopted is secondary filter, the preliminary filtering interference signals of the first order, still can a remaining part disturb through one-level filtering, again after secondary filter, remaining interference is just relatively little, after this circuit is connected to equipment, the indexs such as device power supply (DPS) beta radiation, conducted emission can be reduced, make equipment reach the object of electromagnetism interference; The utility model is integrated with filter circuit and Power convert parts, then by overall embedding, achieves better shield effectiveness.
Owing to have employed technique scheme, the utility model has the following advantages: this Components integration degree is high, volume is little, multiple functional, achieve input, output port electromagnetic compatibility, ensure the stable of Power convert parts input voltage, reduce the electromagnetic interference influence that whole system is subject to.
Accompanying drawing explanation
Fig. 1 is structural representation of the present utility model.
Fig. 2 is the electrical block diagram of Fig. 1.
Embodiment
The technological means realized to make the utility model, creation characteristic, reaching object and effect clearly and be easy to understand, below in conjunction with the drawings and specific embodiments, the utility model being further elaborated:
As shown in Figure 1, the utility model comprises housing and arranges input adapter on the housing and out splice going splice, be located at the Power convert parts in described housing and filter circuit, described filter circuit comprises punching filter, the first filter and the second filter, described input adapter is connected with the input of the first filter by punching filter, first filter is connected with the input of Power convert parts by the second filter, and Power convert element outputs is connected with out splice going splice.
As shown in Figure 2, in filter circuit, described punching filter comprises the first feedthrough capacitor Cx1, second feedthrough capacitor Cx2, first filter comprises the first common mode inductance L1, first electric capacity C1, second electric capacity C2, 3rd electric capacity C3, 5th electric capacity C5 and the 7th electric capacity C7, second filter comprises the second common mode inductance L2, 4th electric capacity C4, 6th electric capacity C6, 8th electric capacity C8, the first described common mode inductance L1 comprises the first inductance L 1-1 and the second inductance L 1-2, second common mode inductance L2 comprises the 3rd inductance L 2-1 and the 4th inductance L 2-2, the input of the first described inductance L 1-1 and the second inductance L 1-2 as described filter circuit signal input part and be connected with described input adapter, the output of the first inductance L 1-1 is connected with Power convert parts electrode input end by the 3rd inductance L 2-1, the output of the second inductance L 1-2 is connected with Power convert parts negative input by the 4th inductance L 2-2, Power convert parts just, cathode output end as described filter circuit signal output part and be connected with described out splice going splice, the first described inductance L 1-1 and the input of the second inductance L 1-2 are respectively through the first feedthrough capacitor Cx1 and the second feedthrough capacitor Cx2 ground connection, between the input being connected across the first inductance L 1-1 and the second inductance L 1-2 after 5th electric capacity C5 and the 3rd electric capacity C3 parallel connection, between the first inductance L 1-1 and the output of the second inductance L 1-2, cross-over connection has the 7th electric capacity C7, and the two ends of described 7th electric capacity C7 are respectively through the second electric capacity C2 and the first electric capacity C1 ground connection, be connected across between the second inductance L 1-2 and the 4th inductance L 2-2 output after the 4th described electric capacity C4, the 6th electric capacity C6, the 8th electric capacity C8 parallel connection.
In filter circuit, by input adapter input power signal, high-frequency coupling is eliminated through the first feedthrough capacitor Cx1 and the second feedthrough capacitor Cx2, rejection frequency is greater than the high frequency spurs signal of 10M hertz, feedthrough capacitor filter effect is again through the first common mode inductance L1, first electric capacity C1, second electric capacity C2, 3rd electric capacity C3, 5th electric capacity C5 and the high frequency spurs signal of the 7th electric capacity C7 rejection frequency between 2-10M hertz, eventually pass the second common mode inductance L2, 4th electric capacity C4, 6th electric capacity C6, 8th electric capacity C8 rejection frequency is at the low frequency spur signal of 1K-2M hertz, power supply signal directly enters the input of Power convert parts through the output of the second filter, final power supply signal enters out splice going splice by the output of Power convert parts and connects load, the utility model is integrated with filter circuit and Power convert parts, again by overall embedding, achieve better shield effectiveness, make Power convert parts operationally reach national military standard GJB1515A-CE102 conducted emission standard and GJB151-RE102, ensure the stability of output signal.
In filter circuit: the first described feedthrough capacitor Cx1, the capacity of the second feedthrough capacitor Cx2 are 470nF, the first described electric capacity C1, the capacity of the second electric capacity C2 are 100nF, the capacity of the 3rd electric capacity C3, the 4th electric capacity is 4.7nF, the capacity of the 5th electric capacity C5, the 6th electric capacity C6 is 2.2uF, the capacity of the 7th electric capacity C7 is 1uF, and the capacity of the 8th electric capacity C8 is 66uF.
Claims (2)
1. the filter circuit of an electromagnetism interference, comprise housing and input adapter on the housing and out splice going splice are set, be located at the Power convert parts in described housing and filter circuit, it is characterized in that: described filter circuit comprises punching filter, the first filter and the second filter, described input adapter is connected with the input of the first filter by punching filter, first filter is connected with the input of Power convert parts by the second filter, and Power convert element outputs is connected with out splice going splice.
2. the filter circuit of electromagnetism interference according to claim 1, it is characterized in that: described punching filter comprises the first feedthrough capacitor (Cx1), second feedthrough capacitor (Cx2), first filter comprises the first common mode inductance (L1), first electric capacity (C1), second electric capacity (C2), 3rd electric capacity (C3), 5th electric capacity (C5) and the 7th electric capacity (C7), second filter comprises the second common mode inductance (L2), 4th electric capacity (C4), 6th electric capacity (C6), 8th electric capacity (C8), described the first common mode inductance (L1) comprises the first inductance (L1-1) and the second inductance (L1-2), second common mode inductance (L2) comprises the 3rd inductance (L2-1) and the 4th inductance (L2-2), the input of described the first inductance (L1-1) and the second inductance (L1-2) as described filter circuit signal input part and be connected with described input adapter, the output of the first inductance (L1-1) is connected with Power convert parts electrode input end by the 3rd inductance (L2-1), the output of the second inductance (L1-2) is connected with Power convert parts negative input by the 4th inductance (L2-2), Power convert parts just, cathode output end as described filter circuit signal output part and be connected with described out splice going splice, described the first inductance (L1-1) and the input of the second inductance (L1-2) are respectively through the first feedthrough capacitor (Cx1) and the second feedthrough capacitor (Cx2) ground connection, between the input being connected across the first inductance (L1-1) and the second inductance (L1-2) after 5th electric capacity (C5) and the 3rd electric capacity (C3) parallel connection, between the first inductance (L1-1) and the output of the second inductance (L1-2), cross-over connection has the 7th electric capacity (C7), and the two ends of described 7th electric capacity (C7) are respectively through the second electric capacity (C2) and the first electric capacity (C1) ground connection, be connected across between the second inductance (L1-2) and the 4th inductance (L2-2) output after the 4th described electric capacity (C4), the 6th electric capacity (C6), the 8th electric capacity (C8) parallel connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520748787.XU CN204928574U (en) | 2015-09-24 | 2015-09-24 | Anti -electromagnetic interference filter circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520748787.XU CN204928574U (en) | 2015-09-24 | 2015-09-24 | Anti -electromagnetic interference filter circuit |
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| Publication Number | Publication Date |
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| CN204928574U true CN204928574U (en) | 2015-12-30 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520748787.XU Active CN204928574U (en) | 2015-09-24 | 2015-09-24 | Anti -electromagnetic interference filter circuit |
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| CN (1) | CN204928574U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112803754A (en) * | 2019-11-13 | 2021-05-14 | 广东美的白色家电技术创新中心有限公司 | EMI filter and household electrical appliance |
-
2015
- 2015-09-24 CN CN201520748787.XU patent/CN204928574U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112803754A (en) * | 2019-11-13 | 2021-05-14 | 广东美的白色家电技术创新中心有限公司 | EMI filter and household electrical appliance |
| CN112803754B (en) * | 2019-11-13 | 2022-04-15 | 广东美的白色家电技术创新中心有限公司 | EMI filter and household electrical appliance |
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