CN203933385U - The active Electromagnetic interference filter of a kind of numeral for charging electric vehicle circuit - Google Patents
The active Electromagnetic interference filter of a kind of numeral for charging electric vehicle circuit Download PDFInfo
- Publication number
- CN203933385U CN203933385U CN201320892581.5U CN201320892581U CN203933385U CN 203933385 U CN203933385 U CN 203933385U CN 201320892581 U CN201320892581 U CN 201320892581U CN 203933385 U CN203933385 U CN 203933385U
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- pass filter
- electromagnetic interference
- filter
- numeral
- converter
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Abstract
The utility model discloses the active Electromagnetic interference filter of a kind of numeral for charging electric vehicle circuit, comprise the high pass filter being connected with charging circuit, high pass filter connection mode number converter, analog to digital converter connects inverter, inverter linking number weighted-voltage D/A converter, digital to analog converter connects low pass filter, and low pass filter connects charging circuit.The active Electromagnetic interference filter of a kind of numeral for electric vehicle charging cord road of the utility model can effectively realize the object of eliminating electromagnetic interference, has saved the passive filtering element of large volume simultaneously, makes filter cost performance higher.
Description
Technical field
The utility model belongs to electromagnetic compatibility equipment technical field, is specifically related to a kind of digital active filter for electric vehicle charging cord road.
Background technology
Plug-in hybrid electric car has obtained very fast development at present, has high switching frequency, high-power DC/DC converter and civil power can be converted to the low tension that electric motor car needs and be stored in A-battery.But high switching frequency has also brought serious electromagnetic interference (EMI), affect the normal operation of device self and surrounding devices, also affect the frequency stabilization of civil power.Therefore carry out filtering electromagnetic interference in the urgent need to a kind of filter.Simulate the negative impedance problem that passive electromagnetic interface filter can bring transducer, affect the stability of filter, and volume is larger, the cost of filter and power consumption change with Switching Power Supply rated power in DC/DC converter.Analogue active electromagnetic interface filter needs extra passive component to complete the decay of EMC pectrum noise, and it is also limited by the realization of the high frequency performance of amplifier.
Utility model content
The purpose of this utility model is to provide the active Electromagnetic interference filter of a kind of numeral for charging electric vehicle circuit, the filter problem that volume, cost and power consumption also increase with the current/voltage increase of DC-DC converter while having solved existing filter elimination electromagnetic interference.
The technical scheme that the utility model adopts is: the active Electromagnetic interference filter of a kind of numeral for charging electric vehicle circuit, comprise the high pass filter being connected with charging circuit, high pass filter connection mode number converter, analog to digital converter connects inverter, inverter linking number weighted-voltage D/A converter, digital to analog converter connects low pass filter, and low pass filter connects charging circuit.
Feature of the present utility model is also,
Charging circuit is provided with inductance, and inductance is between high pass filter and low pass filter.
The beneficial effects of the utility model are: the active Electromagnetic interference filter of a kind of numeral for electric vehicle charging cord road of the utility model can effectively realize the object of eliminating electromagnetic interference, save the passive filtering element of large volume simultaneously, made filter cost performance higher.
Brief description of the drawings
Fig. 1 is the structural representation of a kind of active Electromagnetic interference filter of numeral for charging electric vehicle circuit of the utility model.
In figure, 1. charging circuit, 2. high pass filter, 3. analog to digital converter, 4. inverter, 5. digital to analog converter, 6. low pass filter, 7. inductance.
Embodiment
Below in conjunction with the drawings and specific embodiments, the utility model is elaborated.
The utility model provides a kind of numeral for charging electric vehicle circuit active Electromagnetic interference filter, as shown in Figure 1, comprise the high pass filter 2 being connected with charging circuit 1, high pass filter 2 connection mode number converters 3, analog to digital converter 3 connects inverter 4, inverter 4 linking number weighted-voltage D/A converters 5, digital to analog converter 5 connects low pass filter 6, and low pass filter 6 connects charging circuit 1.Charging circuit 1 is provided with inductance 7, and inductance 7 is between high pass filter 2 and low pass filter 6.
In the time that charging circuit 1 connects mains supply and charge to electric motor car, DC/DC converter is because its high switching frequency can produce electromagnetic interference signal.Due to the produced electromagnetic interference signal integral multiple that is switching frequency, according to the standard of EMC EN61000-6-4, the frequency range of Conducted Electromagnetic Interference is between 150KHz-30MHz, here adopt cut-off frequency higher than switching frequency the high pass filter 2 about 150KHz, just electromagnetic interference signal can be incorporated in analog to digital converter 3 by high pass filter 2.Electromagnetic interference signal through analog to digital converter 3 becomes digital signal, this digital signal is processed through inverter 4 again, form the new digital signal with original signal equal and opposite in direction, single spin-echo, the last analog signal that through digital to analog converter 5, new digital signal is converted again to reconstruct, the analog passband signal of this reconstruct enters in charging circuit 1 after crossing low pass filter 6, the cut-off frequency of low pass filter is in 30MHz left and right, the electromagnetic interference signal of reconstruct and original signal can be neutralized, thereby eliminate electromagnetic interference signal.Inductance 7 is arranged between high pass filter 2 and low pass filter 6, has reduced the coupling between electromagnetic interference signal and reconstruction signal, makes the effect of filter better.
The utility model utilizes the advantage of the parallel and high speed processing data of Digital Signal Processing numeral, adopt reverse reconfiguration technique, make digital active Electromagnetic interference filter when better electromagnetic interference fade performance is provided, the cost of reduction circuit slab integral and volume.
Claims (2)
1. the active Electromagnetic interference filter of the numeral for charging electric vehicle circuit, it is characterized in that: comprise the high pass filter (2) being connected with charging circuit (1), described high pass filter (2) connection mode number converter (3), described analog to digital converter (3) connects inverter (4), described inverter (4) linking number weighted-voltage D/A converter (5), described digital to analog converter (5) connects low pass filter (6), and described low pass filter (6) connects described charging circuit (1).
2. the active Electromagnetic interference filter of a kind of numeral for charging electric vehicle circuit according to claim 1, it is characterized in that: described charging circuit (1) is provided with inductance (7), described inductance (7) is positioned between described high pass filter (2) and described low pass filter (6).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320892581.5U CN203933385U (en) | 2013-12-31 | 2013-12-31 | The active Electromagnetic interference filter of a kind of numeral for charging electric vehicle circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320892581.5U CN203933385U (en) | 2013-12-31 | 2013-12-31 | The active Electromagnetic interference filter of a kind of numeral for charging electric vehicle circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203933385U true CN203933385U (en) | 2014-11-05 |
Family
ID=51829137
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320892581.5U Expired - Fee Related CN203933385U (en) | 2013-12-31 | 2013-12-31 | The active Electromagnetic interference filter of a kind of numeral for charging electric vehicle circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203933385U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI805423B (en) * | 2021-06-28 | 2023-06-11 | 立錡科技股份有限公司 | Switching power converter and active emi filter circuit thereof |
-
2013
- 2013-12-31 CN CN201320892581.5U patent/CN203933385U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI805423B (en) * | 2021-06-28 | 2023-06-11 | 立錡科技股份有限公司 | Switching power converter and active emi filter circuit thereof |
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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 |
Granted publication date: 20141105 Termination date: 20151231 |
|
| EXPY | Termination of patent right or utility model |