CN115833788A - Multi-order filter for ion mobility instrumentation - Google Patents
Multi-order filter for ion mobility instrumentation Download PDFInfo
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Abstract
The present invention provides a multi-order filter for an ion mobility instrument, the multi-order filter comprising: the current limiting protection module, the anti-surge module, the high-frequency filtering module, the intermediate-frequency filtering module and the low-frequency filtering module are sequentially connected from the input end to the output end; the input end of the multi-order filter is connected with the positive electrode and the negative electrode of the input power supply, the output end of the multi-order filter is connected with the positive electrode and the negative electrode of the rear-stage circuit, noise in a radiation middle frequency range has better inhibition capability, better anti-interference capability and electrostatic protection are realized, and the working stability and safety protection of the ion mobility tube instrument and equipment are greatly improved.
Description
Technical Field
The invention relates to the technical field of signal processing, in particular to a multi-order filter for ion mobility instruments and equipment.
Background
The ion migration technology is a micro chemical analysis technology, qualitatively judges ion species by detecting migration time of different charged ions, has small equipment volume and high sensitivity, can reach nanogram-level (1ng =10-9 kg) and even picogram-level (1pg =10-12 kg) in precision, and is widely applied to detection of chemical substances and toxic and harmful gases. The application scenes comprise the monitoring of drugs, explosives and other prohibited drugs by security inspection departments such as airports and customs, the monitoring of air quality by an environment monitoring department, the monitoring of toxic and harmful gases and chemical warfare agents by a military battlefield and the like.
Besides the sampling circuit, the switching power supply, the temperature control circuit and the crystal oscillator, the ion mobility instrument generates corresponding conduction or radiation noise. In particular, high-voltage switching circuits and gate control circuits based on ion mobility electric fields of ion mobility technology generate noise peculiar to this type of instruments and devices, and the noise can be transmitted out through conduction or radiation, so that relevant EMC (Electromagnetic Compatibility) environmental tests fail.
The ion mobility instrument can detect a picogram-level (1pg =10-12 kg) substance, wherein an original signal is a pico ampere-level current signal and is extremely easy to be interfered by noise, and a high-sensitivity operational amplifier circuit is adopted to detect an extremely weak original signal, so that the ion mobility instrument is not only easy to be interfered by the noise but also can amplify undesirable noise, and therefore how to filter the ion mobility instrument is an urgent problem to be solved.
Disclosure of Invention
The invention provides a multi-order filter for ion migration instrument equipment, which has better inhibition capability on noise of a radiation middle frequency band, better interference rejection capability and electrostatic protection, and greatly improves the working stability and safety protection of the ion migration instrument equipment, and the specific scheme is as follows:
a multiple order filter for an ion mobility instrument, the multiple order filter comprising: the current limiting protection module, the anti-surge module, the high-frequency filtering module, the intermediate-frequency filtering module and the low-frequency filtering module are sequentially connected from the input end to the output end;
the input end of the multi-order filter is connected with the positive and negative electrodes of the input power supply, and the output end of the multi-order filter is connected with the positive and negative electrodes of the rear-stage circuit.
Furthermore, the current-limiting protection module comprises a slow-break fuse, and the input end of the slow-break fuse is connected with the positive electrode of the input power supply.
Furthermore, the surge protection module comprises a TVS (transient voltage suppressor) and a voltage dependent resistor, wherein the TVS is connected with the voltage dependent resistor in parallel, the input end of the TVS is connected with the output end of the current limiting protection module, and the output end of the TVS is connected with the negative electrode of the input power supply.
Further, the high-frequency filtering module comprises a first common-mode inductor and a plurality of first capacitors;
the first common-mode inductor comprises a first winding and a second winding, wherein the input end of the first winding is connected with the output end of the current-limiting protection module, and the output end of the second winding is connected with the negative electrode of the input power supply;
one end of one part of the first capacitors in the plurality of first capacitors is connected with the output end of the current-limiting protection module, and the other end of the first capacitors is connected with the negative electrode of the input power supply;
and one end of the other part of the first capacitors in the plurality of first capacitors is connected with the output end of the first winding, and the other end of the first capacitors is connected with the input end of the second winding.
Furthermore, the high-frequency filtering module also comprises a first Y-shaped capacitor bank distributed on one side of the first common-mode inductor;
the first Y-type capacitor bank comprises a plurality of first Y-type capacitors connected in series, one end of each first Y-type capacitor is connected with the output end of the current-limiting protection module or connected with the negative electrode of the input power supply, and the other end of each first Y-type capacitor is grounded.
Further, the inductance of the first common mode inductor is in the order of hundred picohenries, and the capacitance of the first capacitor is in the order of hundred picofarads.
Further, the intermediate frequency filter module comprises a second common mode inductor and a plurality of second capacitors;
the second common-mode inductor comprises a third winding and a fourth winding, wherein the input end of the third winding is connected with the output end of the first winding, and the output end of the fourth winding is connected with the input end of the second winding;
one end of one part of the second capacitors in the plurality of second capacitors is connected with the output end of the first winding, and the other end of the second capacitors is connected with the input end of the second winding;
and one end of the second capacitor in the other part of the first capacitors is connected with the output end of the third winding, and the other end of the second capacitor is connected with the input end of the fourth winding.
Furthermore, the intermediate frequency filter module further comprises a second Y-type capacitor bank and a third Y-type capacitor bank respectively distributed on two sides of the second common mode inductor;
the second Y-type capacitor bank comprises a plurality of second Y-type capacitors connected in series, one ends of the second Y-type capacitors are connected with the output end of the first winding or connected with the output end of the second winding, and the other ends of the second Y-type capacitors are grounded;
the third Y-type capacitor bank comprises a plurality of third Y-type capacitors connected in series, one end of each third Y-type capacitor is connected with the output end of the corresponding third winding or connected with the input end of the corresponding fourth winding, and the other end of each third Y-type capacitor is grounded.
Furthermore, the inductance of the first common-mode inductor is hundreds of microhenries, the capacitance of the first capacitor is hundreds of microfarads, and the capacitance of the third Y-type capacitor is hundreds of picofarads.
Further, the low-frequency filtering module comprises a third common-mode inductor and a plurality of third capacitors;
the third common-mode inductor comprises a fifth winding and a sixth winding, wherein the input end of the fifth winding is connected with the output end of the third winding, and the output end of the sixth winding is connected with the input end of the fourth winding;
one end of each of a part of the third capacitors is connected with the output end of the third winding, and the other end of each of the third capacitors is connected with the input end of the fourth winding;
and one end of the other part of the third capacitors in the plurality of third capacitors is connected with the output end of the fifth winding, and the other end of the third capacitors is connected with the input end of the sixth winding.
Furthermore, the intermediate frequency filter module further comprises a first X-type capacitor and a second X-type capacitor respectively distributed on two sides of the third common mode inductor;
one end of the first X-type capacitor is connected with the output end of the fourth winding, and the other end of the first X-type capacitor is connected with the input end of the fourth winding;
and one end of the second X-type capacitor is connected with the output end of the fifth winding, and the other end of the second X-type capacitor is connected with the input end of the sixth winding.
Further, the inductance of the third common mode inductor is in the order of ten millihenries, and the capacitance of the third capacitor is in the order of ten millifarads.
Furthermore, the first common-mode inductor and the second common-mode inductor adopt a double-winding type winding method, and the third common-mode inductor adopts a split winding type winding method.
Further, the magnetic permeability of the first common mode inductor is smaller than that of the second common mode inductor, and the magnetic permeability of the second common mode inductor is smaller than that of the third inductor.
Furthermore, the arrangement of the first capacitors, the second capacitors and the third capacitors is pi-shaped, and the capacitance values of the first capacitors, the second capacitors and the third capacitors are distributed from large to small in the direction from the input end of the multi-order filter to the output end of the multi-order filter.
According to the invention, the multistage echelon filtering design is realized through the current-limiting protection module, the anti-surge module, the high-frequency filtering module, the medium-frequency filtering module and the low-frequency filtering module, the bandwidth of a filtering frequency domain can be greatly widened, and the pi-shaped symmetrical structure can effectively filter the escape of internal noise, effectively improve radiation disturbance and conduction disturbance, and also improve the conduction immunity and the radiation immunity. The anti-surge module can effectively prevent electrostatic interference and interference of voltage pulse spikes, and protect the safety and reliability of a rear-stage circuit, so that the running reliability of the instrument is improved, and disturbance of instrument equipment to external noise is reduced.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a multi-stage filter for an ion mobility device according to an embodiment of the present invention.
Detailed Description
The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Throughout the specification, reference to "one embodiment," "one example," or "an example" means: the particular features, structures, or characteristics described in connection with the embodiment or example are included in at least one embodiment of the invention. Thus, the appearances of the phrases "in one embodiment," "in an embodiment," "one example" or "an example" in various places throughout this specification are not necessarily all referring to the same embodiment or example. Furthermore, the particular features, structures, or characteristics may be combined in any suitable combination and/or sub-combination in one or more embodiments or examples.
The multi-order filter for an ion mobility device according to the present invention will be described in detail with reference to the accompanying drawings and specific embodiments.
As shown in fig. 1, the present embodiment provides a multiple order filter for an ion mobility instrument, the multiple order filter including: the current limiting protection module 100, the anti-surge module 200, the high-frequency filtering module 300, the intermediate-frequency filtering module 400 and the low-frequency filtering module 500 are sequentially connected from the input end to the output end;
the input end of the multi-order filter is connected with the positive and negative electrodes of the input power supply, and the output end of the multi-order filter is connected with the positive and negative electrodes of the rear-stage circuit.
In this embodiment, the current-limiting protection module 100, the anti-surge module 200, the high-frequency filtering module 300, the intermediate-frequency filtering module 400, and the low-frequency filtering module 500 are arranged in a line, and the input port and the output port of the multi-order filter are isolated from each other in terms of distance, so as to prevent high-frequency noise from being directly coupled with each other at the ports, and thus the high-frequency filtering module 300 loses its performance.
In this embodiment, by using the current-limiting protection module 100, the anti-surge module 200, the high-frequency filtering module 300, the intermediate-frequency filtering module 400, and the low-frequency filtering module 500, the external noise disturbance of the ion mobility instrument device can be reduced by using a multistage filtering and reasonable structure, the anti-disturbance capability of the ion mobility instrument device to the noise disturbance can be improved, the protection capability of the strong-disturbance signal can be prevented, the internal noise of the instrument can be prevented from being transmitted in a conduction and radiation manner, the external noise can be prevented from entering the instrument through the conduction or radiation manner to affect the generation, amplification, and sampling of useful signals of a circuit, and the internal circuit can be prevented from being disturbed or even damaged by static electricity and voltage pulse spikes, and the anti-disturbance capability to external noise and the strong-disturbance signal can be improved.
Further, the current limiting protection module 100 includes a slow-break fuse, and an input end of the slow-break fuse is connected to a positive electrode of the input power source.
In this embodiment, the slow-break fuse can ensure the working current of the ion mobility instrument during normal operation, and can avoid the situation that the fuse is fused by the instantaneous large current.
Further, the surge protection module 200 includes a TVS tube 201 and a voltage dependent resistor 202, the TVS tube 201 and the voltage dependent resistor 202 are connected in parallel, and the input ends of the TVS tube 201 and the voltage dependent resistor 202 are both connected with the output end of the current limiting protection module 100, and the output ends of the TVS tube 201 and the voltage dependent resistor 202 are both connected with the negative electrode of the input power supply.
In this embodiment, when the interference signal arrives, the TVS tube 201 and the varistor 202 are turned on instantly, so as to directly introduce the interference signal to the ground, and suppress or eliminate the strong interference signal such as the electrostatic interference and the voltage pulse spike.
Further, the high-frequency filtering module 300 includes a first common-mode inductor 301 and a plurality of first capacitors 302;
the first common-mode inductor 301 includes a first winding and a second winding, wherein an input end of the first winding is connected to an output end of the current-limiting protection module 100, and an output end of the second winding is connected to a negative electrode of the input power supply;
one end of each of a part of the first capacitors 302 in the plurality of first capacitors 302 is connected to the output end of the current limiting protection module 100, and the other end is connected to the negative electrode of the input power supply;
one end of another part of the first capacitors 302 in the plurality of first capacitors 302 is connected to the output end of the first winding, and the other end is connected to the input end of the second winding.
Further, the inductance of the first common mode inductor 301 is in the order of hundred picohenries, and the capacitance of the first capacitor 302 is in the order of hundred picofarads.
In this embodiment, the first common mode inductor 301 in the high frequency filtering module 300 is an annular magnetic ring made of iron-zinc powder with low magnetic conductivity, the inductor is a double-winding type common mode inductor, the winding controls the inductance to be hundreds of picohenries, and the magnetic material is a material sensitive to hundreds of mega frequencies and can be designed as a common mode inductor for filtering out high frequency noise. From the aspect of circuit design, according to the LC filter characteristics, the inductance of the designed filter required by the noise of the high frequency band is low, so that the first common mode inductor 301 adopts the inductance of hundreds of picohenries, and can filter the corresponding noise by matching with the capacitance of hundreds of picofarads.
In this embodiment, the noise filtered by the high-frequency filtering module 300 is mainly in a common mode, when the noise enters the first common mode inductor 301, the magnetic fields generated by the positive electrode and the negative electrode are cancelled in the inductor magnetic core, and the working current of the ion mobility device is in a differential mode, and is not affected by the magnetic field of the first common mode inductor 301 after entering the magnetic field of the first common mode inductor 301.
Therefore, in this embodiment, the high-frequency filtering module 300 is an annular magnetic ring made of iron and zinc powder, and is sensitive to the frequency of this frequency band, and the magnetic induction lines mainly exist in the magnetic ring, so as to ensure the frequency response and provide a closed magnetic circuit of this frequency.
In the present embodiment, the first capacitors 302 are all ceramic capacitors.
Further, the high frequency filtering module 300 further includes a first Y-type capacitor bank distributed on one side of the first common mode inductor 301;
the first Y-type capacitor bank includes a plurality of first Y-type capacitors 303 connected in series, one end of each first Y-type capacitor 303 is connected to the output end of the current limiting protection module 100 or connected to the negative electrode of the input power supply, and the other end of each first Y-type capacitor 303 is grounded.
Further, the if filter module 400 includes a second common-mode inductor 401 and a plurality of second capacitors 402;
the second common mode inductor 401 includes a third winding and a fourth winding, wherein an input end of the third winding is connected to an output end of the first winding, and an output end of the fourth winding is connected to an input end of the second winding;
one end of each of a part of the second capacitors 402 in the plurality of second capacitors 402 is connected to the output end of the first winding, and the other end is connected to the input end of the second winding;
one end of another part of the second capacitors 402 in the plurality of first capacitors 302 is connected to the output end of the third winding, and the other end is connected to the input end of the fourth winding.
Further, the intermediate frequency filter module 400 further includes a second Y-type capacitor bank and a third Y-type capacitor bank respectively distributed on two sides of the second common mode inductor 401;
the second Y-type capacitor bank comprises a plurality of second Y-type capacitors 403 connected in series, one end of each second Y-type capacitor 403 is connected with the output end of the first winding or connected with the output end of the second winding, and the other end of each second Y-type capacitor 403 is grounded;
the third Y-type capacitor bank includes a plurality of third Y-type capacitors 404 connected in series, one end of each third Y-type capacitor 404 is connected to the output end of the third winding or connected to the input end of the fourth winding, and the other end of each third Y-type capacitor 404 is grounded.
Further, the inductance of the first common mode inductor 301 is hundreds of microhenries, the capacitance of the first capacitor 302 is hundreds of microfarads, and the capacitances of the second Y-capacitor 403 and the third Y-capacitor 404 are hundreds of picofarads.
In this embodiment, the if filtering module 400 is a nickel-zinc annular magnetic ring with medium permeability, the inductor is a dual-winding common mode inductor, the winding controls the inductance to be hundreds of microhenries, the winding diameter is matched with the instrument current, and the magnetic material is a material sensitive to a tens of mega frequency, and can be designed as a first common mode inductor 301 for filtering if noise, and from the instrument noise characteristic of the frequency, both the noise differential mode and the common mode component of the frequency band exist. The inductance of the filter is designed to be low, so that the second common mode inductor 401 adopts an inductance of several hundred microhenries.
In this embodiment, the grounded second Y-type capacitor 403 and the grounded third Y-type capacitor 404 are added to the positive electrode or the negative electrode of the front stage and the rear stage of the second common mode inductor 401, and the capacities of the second Y-type capacitor 403 and the third Y-type capacitor 404 are hundreds of picofarads, so that a mid-pass filter can be formed. A second capacitor 402 is added to the positive electrode or the negative electrode of the front stage and the rear stage of the second common mode inductor 401, and the second common mode inductor 401 and the second capacitor 402 cooperate to effectively filter the low frequency band differential mode noise in the frequency range, so that the second common mode filter inductor cooperates with the second capacitor 402, the second Y-type capacitor 403 and the third Y-type capacitor 404 to filter the low and medium frequency band noise.
Further, the low frequency filtering module 500 includes a third common mode inductor 501 and a plurality of third capacitors 502;
the third common-mode inductor 501 includes a fifth winding and a sixth winding, wherein an input end of the fifth winding is connected with an output end of the third winding, and an output end of the sixth winding is connected with an input end of the fourth winding;
one end of each of a part of the third capacitors 502 in the plurality of third capacitors 502 is connected to the output end of the third winding, and the other end of each of the third capacitors is connected to the input end of the fourth winding;
one end of another part of the third capacitors 502 in the plurality of third capacitors 502 is connected to the output end of the fifth winding, and the other end is connected to the input end of the sixth winding.
Further, the intermediate frequency filter module 400 further includes a first X-type capacitor 503 and a second X-type capacitor 504 respectively distributed at two sides of the third common mode inductor 501;
one end of the first X-type capacitor 503 is connected to the output end of the fourth winding, and the other end is connected to the input end of the fourth winding;
one end of the second X-type capacitor 504 is connected to the output end of the fifth winding, and the other end is connected to the input end of the sixth winding.
Further, the inductance of the third common mode inductor 501 is ten millihenries, and the capacitance of the third capacitor 502 is ten millifarads.
Further, the low-frequency filtering module 500 is an annular magnetic ring made of manganese zinc with high magnetic conductivity, the third common-mode inductor 501 is a separately wound common-mode inductor, the winding enables the inductance to be controlled at tens of millihenries, the magnetic material is a material sensitive to K hertz level frequency and can be designed into a common-mode inductor for filtering low-frequency noise, noise differential mode and common-mode components of the frequency band exist on the instrument noise characteristic of the frequency, the inductance of the designed filter is high, and therefore the third common-mode inductor 501 is tens of millihenries in inductance, and can effectively filter the common-mode noise in the frequency range.
In this embodiment, the third common mode inductor 501 of the low frequency filter module 500 is wound in a winding manner, so that the differential mode inductance component of the inductor can be increased, and then the third capacitor 502 and the X-type capacitor are added to the positive electrode and the negative electrode of the third common mode inductor 501, so that the differential mode noise in the frequency range can be effectively filtered.
Further, the third capacitor 502 and the X-type capacitor are both ceramic capacitors.
Further, the first common-mode inductor 301 and the second common-mode inductor 401 adopt a double-winding type winding method, and the third common-mode inductor 501 adopts a split-winding type winding method.
In this embodiment, the first common-mode inductor 301 of the high-frequency filter module 300 and the second common-mode inductor 401 of the intermediate-frequency filter module 400 adopt a dual-winding type winding manner, which can effectively improve the common-mode filtering performance and reduce the noise on the line.
Further, the magnetic permeability of the annular magnetic ring of the first common mode inductor 301 is smaller than that of the annular magnetic ring of the second common mode inductor 401, and the magnetic permeability of the annular magnetic ring of the second common mode inductor 401 is smaller than that of the annular magnetic ring of the third inductor.
In this embodiment, for example, the first common mode inductor 301 is an annular magnetic ring made of iron-zinc powder, the second common mode inductor 401 is an annular magnetic ring made of nickel-zinc powder, and the third common mode inductor 501 is an annular magnetic ring made of manganese-zinc powder.
Furthermore, the arrangement of the first capacitors 302, the second capacitors 402, and the third capacitors 502 is pi-shaped, and the capacitance values of the first capacitors 302, the second capacitors 402, and the third capacitors 502 are distributed from large to small in the direction from the input end of the multi-order filter to the output end of the multi-order filter.
In this embodiment, the multi-order filter has a pi-type symmetric structure, which can prevent internal noise of the equipment from being transmitted out and external noise from being transmitted into the equipment. The filter capacitor is arranged in a pi-type symmetrical structure, specifically, capacitors are added at the front and rear stages of the common-mode inductor respectively, the capacitors are positioned at the two sides of the common-mode inductor, the pi-type symmetrical structure is adopted, the central symmetry is considered in the structure, and the front-stage filter capacitor is arranged in front of the low-capacity capacitor and the high-capacity capacitor is arranged behind the low-capacity capacitor in the direction from the input end of the multi-stage filter to the output end of the multi-stage filter; from the direction of multi-order filter's output to multi-order filter's input, back level filter capacitor should be that large capacity electric capacity is in the front, and small capacity electric capacity is after, can realize two-way filtering, avoids the instrument internal noise to propagate away promptly, also can prevent that external noise from getting into inside to according to the noise characteristic, also need set up high frequency filter capacitor earlier according to the propagation path, set up low frequency filter capacitor afterwards. In addition, the positive and negative electrode lines of the input end are equal in length as much as possible, equal in impedance and symmetrical in layout, so that the filtering performance is improved.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (15)
1. A multiple order filter for an ion mobility instrument, the multiple order filter comprising: the current limiting protection module, the anti-surge module, the high-frequency filtering module, the intermediate-frequency filtering module and the low-frequency filtering module are sequentially connected from the input end to the output end;
the input end of the multi-order filter is connected with the positive and negative electrodes of the input power supply, and the output end of the multi-order filter is connected with the positive and negative electrodes of the rear-stage circuit.
2. The multiple order filter of claim 1, wherein the current limiting protection module comprises a slow-break fuse, an input terminal of the slow-break fuse being connected to a positive terminal of the input power source.
3. The multiple-order filter according to claim 1, wherein the surge protection module comprises a TVS transistor and a varistor, the TVS transistor and the varistor are connected in parallel, and the input terminals of the TVS transistor and the varistor are connected to the output terminal of the current limiting protection module, and the output terminals of the TVS transistor and the varistor are connected to the negative terminal of the input power source.
4. The multiple-order filter of claim 1, wherein the high frequency filtering module comprises a first common mode inductor and a plurality of first capacitors;
the first common-mode inductor comprises a first winding and a second winding, wherein the input end of the first winding is connected with the output end of the current-limiting protection module, and the output end of the second winding is connected with the negative electrode of the input power supply;
one end of one part of the first capacitors in the plurality of first capacitors is connected with the output end of the current-limiting protection module, and the other end of the first capacitors is connected with the negative electrode of the input power supply;
and one end of the other part of the first capacitors in the plurality of first capacitors is connected with the output end of the first winding, and the other end of the first capacitors is connected with the input end of the second winding.
5. The multiple-order filter of claim 4, wherein the high frequency filtering module further comprises a first bank of Y-capacitors distributed on one side of the first common mode inductor;
the first Y-type capacitor bank comprises a plurality of first Y-type capacitors connected in series, one end of each first Y-type capacitor is connected with the output end of the current-limiting protection module or connected with the negative electrode of the input power supply, and the other end of each first Y-type capacitor is grounded.
6. The multiple-order filter as claimed in claim 4, wherein the inductance of the first common mode inductor is in the order of hundred picohenries, and the capacitance of the first capacitor is in the order of hundred picofarads.
7. The multiple-order filter of claim 4, wherein the IF filter module comprises a second common-mode inductor and a plurality of second capacitors;
the second common-mode inductor comprises a third winding and a fourth winding, wherein the input end of the third winding is connected with the output end of the first winding, and the output end of the fourth winding is connected with the input end of the second winding;
one end of one part of the second capacitors in the plurality of second capacitors is connected with the output end of the first winding, and the other end of the second capacitors is connected with the input end of the second winding;
and one end of the second capacitor in the other part of the first capacitors is connected with the output end of the third winding, and the other end of the second capacitor is connected with the input end of the fourth winding.
8. The multi-order filter of claim 7, wherein the if filter module further comprises a second Y-type capacitor bank and a third Y-type capacitor bank respectively disposed at two sides of the second common mode inductor;
the second Y-type capacitor group comprises a plurality of second Y-type capacitors connected in series, one ends of the second Y-type capacitors are connected with the output end of the first winding or connected with the output end of the second winding, and the other ends of the second Y-type capacitors are grounded;
the third Y-type capacitor bank comprises a plurality of third Y-type capacitors connected in series, one end of each third Y-type capacitor is connected with the output end of the corresponding third winding or connected with the input end of the corresponding fourth winding, and the other end of each third Y-type capacitor is grounded.
9. The multiple-order filter of claim 8, wherein the inductance of the first common mode inductor is hundreds microhenry, the capacitance of the first capacitor is hundreds microfarad, and the capacitance of the third Y-type capacitor is hundreds picofarad.
10. The multiple order filter of claim 7, wherein the low frequency filtering module comprises a third common mode inductor and a plurality of third capacitors;
the third common-mode inductor comprises a fifth winding and a sixth winding, wherein the input end of the fifth winding is connected with the output end of the third winding, and the output end of the sixth winding is connected with the input end of the fourth winding;
one end of each of a part of the third capacitors is connected with the output end of the third winding, and the other end of each of the third capacitors is connected with the input end of the fourth winding;
and one end of the other part of the third capacitors in the plurality of third capacitors is connected with the output end of the fifth winding, and the other end of the third capacitors is connected with the input end of the sixth winding.
11. The multi-order filter according to claim 10, wherein the if filter module further comprises a first X-type capacitor and a second X-type capacitor respectively disposed at two sides of the third common mode inductor;
one end of the first X-type capacitor is connected with the output end of the fourth winding, and the other end of the first X-type capacitor is connected with the input end of the fourth winding;
and one end of the second X-type capacitor is connected with the output end of the fifth winding, and the other end of the second X-type capacitor is connected with the input end of the sixth winding.
12. The multiple-order filter of claim 10, wherein the inductance of the third common-mode inductor is in the order of ten millihenries and the capacitance of the third capacitor is in the order of ten millifarads.
13. The multiple order filter of claim 10 wherein the first common mode inductor and the second common mode inductor are wound in a double winding manner and the third common mode inductor is wound in a split winding manner.
14. The multiple-order filter of claim 10, wherein the permeability of the first common-mode inductor is less than the permeability of the second common-mode inductor, and the permeability of the second common-mode inductor is less than the permeability of the third common-mode inductor.
15. The multiple-order filter of claim 10, wherein the first capacitors, the second capacitors, and the third capacitors are all arranged in a pi-type manner, and capacitance values of the first capacitors, the second capacitors, and the third capacitors are distributed from large to small in a direction from an input end of the multiple-order filter to an output end of the multiple-order filter.
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| CN202211513380.XA CN115833788A (en) | 2022-11-29 | 2022-11-29 | Multi-order filter for ion mobility instrumentation |
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| CN202211513380.XA CN115833788A (en) | 2022-11-29 | 2022-11-29 | Multi-order filter for ion mobility instrumentation |
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