CN113162396A - Asymmetric cascade type active EMI filter based on VSCC and CSCC - Google Patents
Asymmetric cascade type active EMI filter based on VSCC and CSCC Download PDFInfo
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- CN113162396A CN113162396A CN202110368248.3A CN202110368248A CN113162396A CN 113162396 A CN113162396 A CN 113162396A CN 202110368248 A CN202110368248 A CN 202110368248A CN 113162396 A CN113162396 A CN 113162396A
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- 238000005070 sampling Methods 0.000 claims description 12
- 238000002347 injection Methods 0.000 claims description 7
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- 238000001914 filtration Methods 0.000 claims description 3
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- 238000003780 insertion Methods 0.000 description 5
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- 230000003321 amplification Effects 0.000 description 2
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/44—Circuits or arrangements for compensating for electromagnetic interference in converters or inverters
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Abstract
The invention discloses an asymmetric cascade type active EMI filter based on VSCC and CSCC, the cascade scheme includes: the input end of the front stage VSCC active filter is connected with an input power supply, the output end of the front stage VSCC active filter is connected with the input end of the rear stage CSCC active filter, the input end of the rear stage CSCC active filter is connected with the output end of the front stage VSCC active filter, and the output end of the rear stage CSCC active filter is connected with output electric equipment; the input power supply can be an alternating current signal input or a direct current signal input, and the output equipment can be direct current electric equipment or alternating current electric equipment. Through the technical scheme, the overall size of the filter is small, and the filter has high suppression capacity on noise signals.
Description
Technical Field
The invention relates to the field of electromagnetic compatibility, in particular to an asymmetric cascade active filter structure with small volume and high insertion loss and a realization circuit thereof.
Background
Power electronics technology is always developing towards high frequency, miniaturization, high power and high power density. With the increase of control frequency and the application of new generation semiconductor devices, the volume and efficiency of power electronic equipment are optimized well nowadays. However, high switching speeds and switching frequencies also cause severe deterioration of the electromagnetic environment, so that the amplitude and frequency band of the noise occurrence are significantly increased. The traditional passive EMI filter can play a good role in attenuating noise signals by adding inductance and capacitance elements in a circuit, but due to the limitation of the volume of the passive EMI filter, the passive EMI filter cannot adapt to the development trend of power electronic equipment. The active EMI filter is different from a traditional passive filter, the noise signal is counteracted in a mode of injecting a compensation signal reversely, the active filter can be optimized in size due to the fact that a large-size passive device is not adopted, the suppression effect of the active filter on the noise is limited, and a single-stage active filter cannot achieve the required effect. The hybrid EMI filter can achieve a balance between noise suppression and volume optimization by using a combination of an active filter and a passive filter, and the hybrid EMI filter is smaller than a conventional passive EMI filter in size but still bulky compared to the active filter while optimizing filtering capability.
Disclosure of Invention
The invention aims to provide an asymmetric cascade active EMI filter with small volume and high insertion loss, which aims to solve the problem that the existing EMI filter cannot meet the requirements of high insertion loss and small volume of power electronic equipment and optimize the use of the EMI filter in the power electronic equipment.
The asymmetrical cascade type active filter provided by the invention is suitable for power electronic equipment with high requirements on noise suppression capability and size. The proposed asymmetrical cascade type active filter mainly comprises two stages of active filters of different types, which greatly attenuate noise signals in a pure active manner, and meanwhile, because no additional passive filter is needed, the proposed asymmetrical cascade type active filter can ensure high insertion loss and simultaneously greatly optimize the overall volume compared with the volume of the traditional filter.
The invention provides an asymmetric cascade type active EMI filter circuit based on VSCC and CSCC, which is used for solving the problem that the traditional passive filter cannot adapt to the development trend of miniaturization and high frequency of power electronic equipment.
The invention provides an asymmetric cascade type active EMI filter circuit based on VSCC and CSCC, the circuit includes:
the two-stage asymmetrical active filter is connected in series, the input end of the front stage VSCC active filter is connected with an input power supply, the output end of the front stage VSCC active filter is connected with the input end of the rear stage CSCC active filter, the input end of the rear stage CSCC active filter is connected with the output end of the front stage VSCC active filter, and the output end of the rear stage CSCC active filter is connected with output electric equipment. The input power supply can be an alternating current signal input or a direct current signal input, and the output equipment can be direct current electric equipment or alternating current electric equipment. The two active filters do not share the same sampling signal and sampling point, and the two active filters do not share the same injection signal and compensation signal injection point. The asymmetrical cascade type active filter carries out twice compensation on the noise signal, the compensation signal of the front stage VSCC active filter is based on the noise signal, and the compensation signal of the rear stage CSCC active filter is based on the sum of the noise signal and the compensation signal of the front stage VSCC active filter. The asymmetric cascade active filter does not introduce a traditional passive filter element with a large volume, and has a small volume and strong inhibition capability on interference signals.
In combination with the above aspects, the asymmetric cascaded active EMI filter circuit based on VSCC and CSCC has two possible applications: in a first possible application scenario, the asymmetric cascade type active EMI filter based on VSCC and CSCC is used alone, and the filter as a whole does not include a filter element having a conventional filtering function; in a second possible application scenario, the asymmetric cascade type active EMI filter based on the VSCC and the CSCC is used together with a conventional passive filter element to achieve a better suppression effect on noise signals.
The asymmetrical cascade type active EMI filter circuit based on the VSCC and the CSCC provided by the invention has the following advantages: the asymmetrical cascade type active filter circuit performs reverse cancellation on noise signals in an active mode, and the filter does not relate to a large passive filter element and has the advantage of small volume compared with a traditional passive filter circuit. And secondly, the asymmetric cascade type active filter has the advantage of high insertion loss, and compared with the conventional single-stage active filter, the asymmetric cascade type active filter has the advantage of obviously improving the noise suppression capability. And thirdly, the asymmetrical cascade active filter is simultaneously suitable for inhibiting common mode noise and differential mode noise, and the inhibiting effect is obviously improved on the basis of a single-stage active filter.
Drawings
FIG. 1 is a schematic diagram of the connection of an asymmetrical cascade type active filter
FIG. 2 is a schematic diagram of an asymmetrical cascaded active EMI filter based on VSCC and CSCC
FIG. 3 is a circuit diagram of an asymmetrical cascaded active EMI filter based on VSCC and CSCC
FIG. 4 shows the simulation results of the asymmetrical cascade type active EMI filter based on VSCC and CSCC
FIG. 5 shows the actual measurement results of the asymmetrical cascade type active EMI filter based on VSCC and CSCC
Detailed Description
In the technical scheme that this application embodiment provided, asymmetric cascade type active filter constitute by preceding stage VSCC active filter and back-stage CSCC active filter, input power supply is connected to preceding stage VSCC active filter's input, and the output is connected back-stage CSCC active filter input, back-stage CSCC active filter input is connected preceding stage VSCC active filter output, output connection output consumer.
The main implementation principle, the specific implementation mode and the corresponding achievable effects of the technical solution of the embodiment of the present application are described in detail below with reference to the accompanying drawings.
Example one
Referring to fig. 1, an embodiment of the present invention provides a circuit diagram of an asymmetric cascaded active filter, the circuit including:
the two-stage asymmetrical cascade type active filter is connected in series and comprises a front stage VSCC active filter and a rear stage CSCC active filter, wherein the input end of the front stage VSCC active filter is connected with an input power supply, the output end of the front stage VSCC active filter is connected with the input end of the rear stage CSCC active filter, the input end of the rear stage CSCC active filter is connected with the output end of the front stage VSCC active filter, and the output end of the rear stage CSCC active filter is connected with output electric equipment. In the application occasion, the input power supply can be AC signal input or DC signal input, and the output electric equipment can be DC electric equipment or AC electric equipment, and the asymmetric cascade active filter does not influence the normal working state of the output electric equipment.
Referring to fig. 2, in the schematic diagram of the asymmetric cascade type active filter, the equivalent interfered object Z is mainly composed ofLISNThe front stage VSCC active filter, the rear stage CSCC active filter and the interference source equivalent circuit. The front stage VSCC active filter adopts a voltage sampling current compensation topological circuit, the rear stage CSCC active filter adopts a current sampling current compensation topological circuit, and the front stage VSCC active filter and the rear stage CSCC active filter both adopt feedback control. The noise signal flows out from the equivalent interference source side and flows through the equivalent interfered object to generate an interference voltage signal on the equivalent interfered object, the interference voltage signal is obtained by sampling of the front-stage VSCC active filter, and a compensation signal I is generated after the noise signal passes through the signal amplification link of the front-stage VSCC active filterCompensation _1The compensation signal has a close amplitude, opposite phase to the interference current flowing to the equivalent interfered object. Due to the combined action of the compensation signal and the original interference signal, the interference current flowing through the equivalent interfered object is cancelled, and the noise is greatly attenuated. The post-stage CSCC active filter adopts a current sampling current compensation topology, and signals sampled by the post-stage CSCC active filter circuit are interference current and compensation current I flowing through the equivalent interfered objectCompensation _1And thus the sampled signal has a larger amplitude. The current signal sampled by the post-stage CSCC active filter is amplified by a signal amplification link of the post-stage CSCC active filter to generate a compensation signal ICompensation _2From a placeThe compensation signal generated by the later stage CSCC active filter will be greater in magnitude than the compensation signal generated by the earlier stage VSCC active filter. Because the preceding stage VSCC active filter and the following stage CSCC active filter both adopt feedback control, larger feedback signals bring better noise suppression effect.
Referring to fig. 3, a circuit diagram of the asymmetric cascade type active EMI filter based on VSCC and CSCC is shown, and a circuit simulation is performed based on the circuit of fig. 3, and a simulation result is shown in fig. 4. Compared with the amplitude of the noise signal before and after the asymmetrical cascade type active filter is added, the asymmetrical cascade type active filter provided by the invention has an obvious noise suppression effect.
Referring to fig. 5, a curve Q1 in the figure is a noise amplitude value under the condition that the asymmetric cascade type active filter is not added in an experimental test, a curve Q2 is a noise amplitude value under the condition that the asymmetric cascade type active filter is added, by comparing before and after the asymmetric cascade type active filter is added, a noise signal has a great attenuation in amplitude value, and the asymmetric cascade type active filter has a strong eliminating effect on the noise signal.
Claims (6)
1. An asymmetrical cascade active EMI filter based on VSCC and CSCC is characterized in that two stages of voltage sampling current injection VSCC and current sampling current injection CSCC special-shaped active filters are connected in series, the input end of a front stage VSCC active filter is connected with an input power supply, the output end of the front stage VSCC active filter is connected with the input end of a rear stage CSCC active filter, the input end of the rear stage CSCC active filter is connected with the output end of the front stage VSCC active filter, and the output end of the rear stage CSCC active filter is connected with output electric equipment; the VSCC active filter and the CSCC active filter have different sampling and compensation characteristics, and respectively perform primary cancellation on electromagnetic interference noise signals EMI; the topology and the implementation mode of the VSCC active filter and the CSCC active filter are independent; the input power supply can be AC signal input or DC signal input, and the output equipment is DC electric equipment or AC electric equipment, and can be used independently or used together with other filters.
2. The asymmetrical cascade type active EMI filter based on VSCC and CSCC as claimed in claim 1, wherein the two-stage cascade type active filters are connected in series, the input terminal of the preceding stage VSCC active filter is connected to the input power source, the output terminal is connected to the input terminal of the following stage CSCC active filter, the input terminal of the following stage CSCC active filter is connected to the output terminal of the preceding stage VSCC active filter, the output terminal is connected to the input terminal of the active filter, the two-stage active filters do not share the same sampling signal and sampling point, and the two-stage active filters do not share the same injection signal and compensation signal injection point.
3. The asymmetrical cascade-type active EMI filter based on VSCC and CSCC as claimed in claim 1, wherein the two-stage active filter performs a secondary filtering effect on the noise signal, and after the front stage VSCC active filter samples the noise signal and injects the compensation signal, the signal sampled by the rear stage CSCC active filter is a sum of the noise signal and the compensation signal of the front stage VSCC active filter, and injects the compensation signal having a larger gain according to the signal.
4. The asymmetric cascaded active EMI filter based on VSCC and CSCC of claim 1, wherein the topology of the two stages of active filters is independent, and the front stage VSCC active filter and the rear stage CSCC active filter use different sampling methods or different compensation signal injection methods or different active filter control methods.
5. The asymmetrical cascading active EMI filter based on VSCC and CSCC of claim 1 wherein the input power source can be AC or DC signal input, the output device can be AC or DC powered device, the asymmetrical cascading active filter circuit is suitable for various power supply forms and power supply occasions and various power utilization forms and power utilization occasions.
6. The asymmetrical cascade type active EMI filter based on VSCC and CSCC as claimed in claim 1, wherein the asymmetrical cascade type active EMI filter is small and exquisite in size, and has a significant suppression effect on noise signals without introducing a conventional passive filter element with a large size; the circuit can be used independently in actual occasions, and can also be matched with a passive filter to be used together according to requirements, so that a better noise signal suppression effect is achieved.
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| CN114221411A (en) * | 2021-12-13 | 2022-03-22 | 南方电网数字电网研究院有限公司 | Direct current traction power supply device and system |
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| WO2020197334A1 (en) * | 2019-03-28 | 2020-10-01 | 이엠코어텍 주식회사 | Stand-alone active emi filter module |
| WO2020213997A1 (en) * | 2019-04-17 | 2020-10-22 | 이엠코어텍 주식회사 | Device for compensating for voltage or current |
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| CN104868466A (en) * | 2015-04-27 | 2015-08-26 | 华为技术有限公司 | Filtering device and power supply system |
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