CN110336542A - A kind of low-frequency range filter, electrical equipment and its low-frequency range filtering method - Google Patents
A kind of low-frequency range filter, electrical equipment and its low-frequency range filtering method Download PDFInfo
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- CN110336542A CN110336542A CN201910718258.8A CN201910718258A CN110336542A CN 110336542 A CN110336542 A CN 110336542A CN 201910718258 A CN201910718258 A CN 201910718258A CN 110336542 A CN110336542 A CN 110336542A
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- common mode
- low frequency
- trap
- frequency range
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H17/00—Networks using digital techniques
- H03H17/02—Frequency selective networks
- H03H17/0248—Filters characterised by a particular frequency response or filtering method
- H03H17/025—Notch filters
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H7/00—Multiple-port networks comprising only passive electrical elements as network components
- H03H7/01—Frequency selective two-port networks
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H7/00—Multiple-port networks comprising only passive electrical elements as network components
- H03H7/01—Frequency selective two-port networks
- H03H2007/013—Notch or bandstop filters
Abstract
The invention discloses a kind of low-frequency range filter, electrical equipment and its low-frequency range filtering method, which includes: basic filter unit and the first low frequency trap wave unit；The first low frequency trap wave unit is arranged in the basic filter unit；Wherein, the basic filter unit is filtered out for the common mode interference to frequency range part except low-frequency range in power supply to be filtered；The first low frequency trap wave unit provides the low impedance by-pass access of low frequency common interference for the common mode interference to low-frequency range part in the power supply.The solution of the present invention can solve to improve low-frequency range common mode filtering performance the problem of device cost is significantly increased, achieve the effect that the reduction device cost in the case where improving low-frequency range common mode filtering performance.
Description
Technical field
The invention belongs to technical field of filtering, and in particular to a kind of low-frequency range filter, electrical equipment and its low-frequency range
Filtering method more particularly to a kind of low-frequency range conduction common mode interference trap circuit and household electrical appliance.
Background technique
Common-mode filter is used to filter out the common mode interference of electrical equipment generation, to meet electromagnetic compatibility standard requirement.Common mode
The usual structure of filter includes common mode capacitance (also referred to as Y capacitance) and common mode inductance, by the common code impedance of common mode inductance with
And the bypass effect of common mode capacitance reduces common mode interference.Common-mode filter acts on frequency range and exists generally directed to Conducted Electromagnetic Interference
150kHz-30mHz。
It is FAQs that electromagnetic compatibility test encounters that low-frequency range (150kHz- about 700kHz) Conducted Electromagnetic Interference is exceeded.
For low-frequency range common mode interference, it usually needs increase the capacitance of common mode capacitance to improve filtering performance, but the increasing of capacitance by
To the constraint of electrical safety, leakage current.Increasing filter order can be improved low-frequency range common mode filtering performance, but device at
Originally it is significantly increased.In some active common mode filter circuits, need using high voltage transistor and accessory power supply, poor reliability, electricity
Road is at high cost.
Above content is only used to facilitate the understanding of the technical scheme, and is not represented and is recognized that above content is existing skill
Art.
Summary of the invention
It is an object of the present invention in view of the foregoing drawbacks, a kind of low-frequency range filter, electrical equipment and its low frequency are provided
Section filtering method reaches and is mentioning to solve the problems, such as that device cost is significantly increased to improve low-frequency range common mode filtering performance
The effect of device cost is reduced in the case where height frequency range common mode filtering performance.
The present invention provides a kind of low-frequency range filter, comprising: basic filter unit and the first low frequency trap wave unit；It is described
First low frequency trap wave unit is arranged in the basic filter unit；Wherein, the basic filter unit, for to be filtered
Power supply in except low-frequency range the common mode interference of frequency range part filtered out；The first low frequency trap wave unit, for described
The common mode interference of low-frequency range part provides the low impedance by-pass access of low frequency common interference in power supply.
Optionally, the basic filter unit, comprising: the first magnet ring, the first common mode choke, the first common mode capacitance and
Two common mode capacitances；Wherein, first magnet ring, is arranged at L, N line of the electric power incoming line of the power supply；First low frequency is fallen into
L, N line and ground wire of electric power incoming line is successively arranged in wave unit, first common mode capacitance and second common mode capacitance parallel
Between, and the first low frequency trap wave unit is between first magnet ring and first common mode capacitance；Described first is total
Mould choke coil is arranged on L, N line of electric power incoming line, and be located at first common mode capacitance and second common mode capacitance it
Between.
Optionally, first magnet ring, comprising: low-frequency range magnet ring of the impedance value more than preset value；The low-frequency range magnetic
Ring, comprising: high-conductive manganese-zinc ferrite magnet ring or nanocrystalline, amorphous magnet ring.
Optionally, the first low frequency trap wave unit, comprising: the first trap boosting capacitor and the first low frequency trap inductance；
Wherein, the common end of the first trap boosting capacitor is grounded after the first low frequency trap inductance.
Optionally, the first low frequency trap wave unit, further includes: the first low frequency trap resistance；Wherein, first trap
The common end of boosting capacitor is successively grounded after the first low frequency trap inductance and the first low frequency trap resistance.
Optionally, the capacitance of first boosting capacitor, less than the capacitance of first common mode capacitance；And/or institute
State the first boosting capacitor, comprising: ceramic electrical perhaps thin-film capacitor.
Optionally, further includes: the second low frequency trap wave unit；The second low frequency trap wave unit, is arranged in power outlet
L, between N line and ground wire, and it is located at the side of the basic filter unit far from the power supply.
Optionally, the structure of the second low frequency trap wave unit is identical as the first low frequency trap wave unit；Alternatively, institute
The resonance frequency for stating the second low frequency trap wave unit is staggered setting value with the resonance frequency of the first low frequency trap wave unit.
Match with above-mentioned apparatus, further aspect of the present invention provides a kind of electrical equipment, comprising: above-described low-frequency range
Filter.
Matching with above-mentioned electrical equipment, further aspect of the present invention provides a kind of low-frequency range filtering method of electrical equipment,
It include: to be filtered out by basic filter unit to the common mode interference of frequency range part except low-frequency range in power supply to be filtered；It is logical
The first low frequency trap wave unit is crossed, the common mode interference of low-frequency range part in the power supply is provided by the Low ESR of low frequency common interference
Road access.
The solution of the present invention is low by providing the low impedance by-pass access of low frequency common interference using series resonance principal
Filtering out for low-frequency range mutual sensitized is realized at local.
Further, the solution of the present invention, by providing the low impedance by-pass of low frequency common interference using series resonance principal
Access, filter order are reduced, and power supply line outlet magnet ring is reduced, the decline of circuit devcie cost.
Further, the solution of the present invention, by providing the low impedance by-pass of low frequency common interference using series resonance principal
Access reduces device cost, and good reliability in the case where improving low-frequency range common mode filtering performance.
The solution of the present invention as a result, it is logical by the low impedance by-pass for providing low frequency common interference using series resonance principal
Road solves the problems, such as that device cost is significantly increased to improve low-frequency range common mode filtering performance, reaches and be total in raising low-frequency range
The effect of device cost is reduced in the case where mould filtering performance.
Other features and advantages of the present invention will be illustrated in the following description, also, partly becomes from specification
It obtains it is clear that understand through the implementation of the invention.
Below by drawings and examples, technical scheme of the present invention will be described in further detail.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of an embodiment of low-frequency range filter of the invention, specially low frequency common trap
The structural schematic diagram of circuit；
Fig. 2 is the structural schematic diagram of another embodiment of low-frequency range filter of the invention, specially low frequency filtering
The structural schematic diagram of second level trap circuit；
Fig. 3 is the structural schematic diagram of conventional secondary filter circuit；
Fig. 4 is a kind of Conducted EMI test effect schematic diagram of the interference based on Fig. 3；
Fig. 5 is a kind of Conducted EMI test effect schematic diagram of the interference based on Fig. 1.
In conjunction with attached drawing, appended drawing reference is as follows in the embodiment of the present invention:
The first Y capacitance of Y1-；The second Y capacitance of Y2-；C1- the first boosting capacitor；C2- the second boosting capacitor；L1- the first trap
Inductance；L2- the second trap inductance；R1- the first trap resistance；R2- the second trap resistance.
Specific embodiment
To make the object, technical solutions and advantages of the present invention clearer, below in conjunction with the specific embodiment of the invention and
Technical solution of the present invention is clearly and completely described in corresponding attached drawing.Obviously, described embodiment is only the present invention one
Section Example, instead of all the embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art are not doing
Every other embodiment obtained under the premise of creative work out, shall fall within the protection scope of the present invention.
According to an embodiment of the invention, providing a kind of low-frequency range filter.The device of the invention shown in Figure 1
The structural schematic diagram of one embodiment.The low-frequency range filter may include: basic filter unit and the first low frequency trap wave unit.
The first low frequency trap wave unit is arranged in the basic filter unit.
Wherein, the basic filter unit can be used for being total to frequency range part except low-frequency range in power supply to be filtered
Mould interference is filtered out.The first low frequency trap wave unit, can be used for the common mode interference to low-frequency range part in the power supply
The low impedance by-pass access of low frequency common interference is provided.
Such as: it is filtered out to be achieved at low cost low-frequency range (150kHz- about 700kHz) mutual sensitized, this
The scheme of invention provides a kind of low-frequency range conduction common mode interference trap circuit and household electrical appliance, reduces filter order, power supply
Line outlet magnet ring is reduced, the decline of circuit devcie cost.Such as: the low-resistance of low frequency common interference is provided using series resonance principal
Anti- bypass path can solve to improve low-frequency range common mode filtering performance the problem of device cost is significantly increased, reach
The effect of device cost is reduced in the case where improving low-frequency range common mode filtering performance.
Low frequency filtering effect can be enhanced in being equipped with by basic filter unit and the first low frequency trap wave unit as a result,
Fruit enhances the effect of filtering common mode Conducted Electromagnetic Interference.
In an optional example, the basic filter unit may include: the first magnet ring, the first common mode choke,
One common mode capacitance and the second common mode capacitance.
Wherein, first magnet ring, is arranged at L, N line of the electric power incoming line of the power supply.The first low frequency trap
Unit, first common mode capacitance and second common mode capacitance, be successively arranged in parallel electric power incoming line L, N line and ground wire it
Between, and the first low frequency trap wave unit is between first magnet ring and first common mode capacitance.First common mode
Choke coil is arranged on L, N line of electric power incoming line, and between first common mode capacitance and second common mode capacitance.
Such as: using after the low frequency common trap circuit of Fig. 1 structure, (its equivalent rectification principle is to increase Y capacitance to hold
Value), it is possible to reduce a common mode choke is used, the ferrite/amorphous common mode choke for selecting low frequency inhibitory effect good, and root
1-2 magnet ring is used according to actual conditions are adjustable, amorphous/nanocrystalline material is selected, guarantees high-frequency suppressing effect, be finally reached
Effect is as shown in Figure 5 (allowance 12dB, promotes 8 dB allowances near low frequency 150K Hz).
It is set as a result, by the cooperation of the first magnet ring, the first common mode choke, the first common mode capacitance and the second common mode capacitance
It sets, may be implemented to filter out in power supply in the common mode interference of frequency range part between low-frequency range part and high band part, tie
Structure is simple.
Optionally, first magnet ring may include: low-frequency range magnet ring of the impedance value more than preset value.The low frequency
Section magnet ring, may include: high-conductive manganese-zinc ferrite magnet ring or nanocrystalline, amorphous magnet ring.
Such as: in order to make filter effect more preferably, suitable magnet ring can be added in LN line, usually select low-frequency range impedance
It is worth higher high-conductive manganese-zinc ferrite magnet ring or nanocrystalline, amorphous magnet ring, to enhance low frequency filtering effect.
As a result, by setting low frequency magnet ring, low frequency filtering effect can be preferably promoted in the case where low cost.
In an optional example, the first low frequency trap wave unit may include: the first trap boosting capacitor and first
Low frequency trap inductance.
Wherein, the common end of the first trap boosting capacitor is grounded after the first low frequency trap inductance.
Low frequency trap wave unit is constituted by boosting capacitor and low frequency trap inductance as a result, structure is simple, and can enhance low frequency
Filter effect filters high reliablity.
In a further optional example, the first low frequency trap wave unit can also include: the first low frequency trap electricity
Resistance.
Such as: for the general value of trap resistance in 10-500 Ω, the notch bandwidth that can according to need adjusts the resistance of trap resistance
Value.If trap inductance uses manganese-zinc ferrite, ferrocart core, powder core, nanocrystalline, amorphous magnetic core, in trap frequency core loss
Angle tangent is larger, then can use core loss and generate damping, save series notch resistance.
Wherein, the common end of the first trap boosting capacitor, successively through the first low frequency trap inductance and described
It is grounded after one low frequency trap resistance.
Such as: low-frequency range trap circuit (such as the first trap branch), principle is as shown in Figure 1.The low frequency trap circuit can be with
Include: that one group of boosting capacitor connects L line and N line respectively, is grounded again after connecting with trap inductance and trap resistance.Boosting capacitor and fall into
Wave inductance forms series resonant tank, and resonance center frequeH is typically but not limited between 100kHz-500kHz.In Fig. 1, trap electricity
Hold (such as the first boosting capacitor C1), trap inductance (such as the first trap inductance LL1), trap resistance (such as the first trap resistance RL1) group
At low impedance by-pass access, the impedance that reduces its bypass path in parallel with first common mode capacitance Y1 (such as Y capacitance).In this way,
On one common mode capacitance Y1 (such as Y capacitance), a upper low impedance by-pass access in parallel enhances low frequency filtering effect.
As a result, by the way that low frequency trap resistance is arranged in low frequency trap wave unit, the suitable of low frequency filtering can be preferably promoted
It is precisely and reliable with range.
Wherein, in the above various embodiments, the set-up mode of boosting capacitor may include at least one setting situation.
The first setting situation: the capacitance of first boosting capacitor, less than the capacitance of first common mode capacitance.
Such as: the usual value of boosting capacitor is between 0.1-10nF, using ceramics or thin film dielectrics capacitor.Boosting capacitor takes
Value is far smaller than common mode capacitance (such as Y capacitance) value, generates adverse effect to avoid boosting capacitor and Y capacitance parallel resonance.
Second of setting situation: first boosting capacitor may include: ceramic electrical perhaps thin-film capacitor.
Such as: the general value of trap inductance is between 50uH-1mH, using nickel-zinc ferrite or MgZn ferrite, so that
The Q value of inductance is higher near trap frequency point.
As a result, by setting boosting capacitor parameter, form etc., can satisfy the filtering demands of different occasions, flexibly and
It is convenient.
It can also include: the second low frequency trap wave unit in an optional embodiment.The second low frequency trap list
Member is arranged between L, N line of power outlet and ground wire, and is located at the side of the basic filter unit far from the power supply,
The i.e. described basic filter unit is located at the side of second common mode capacitance far from the first common mode choke.
Such as: in order to make low frequency trap better effect, can at the second common mode capacitance Y2 (such as Y capacitance) also trap in parallel
Branch, as shown in Figure 2.In Fig. 2, boosting capacitor (such as the first boosting capacitor C1With the second boosting capacitor C2), trap inductance (such as
One trap inductance L1With the second trap inductance L2), trap resistance (such as the first trap resistance R1With the second trap resistance R2) composition it is low
Impedance bypass access (such as the first trap branch and the second trap branch), respectively with the first common mode capacitance Y1 (such as Y capacitance), second
Common mode capacitance Y2 (such as Y capacitance) impedance in parallel for reducing its bypass path, enhances its low frequency filtering effect.In this way, total first
On mould capacitor Y1 (such as Y capacitance), the second common mode capacitance Y2 (such as Y capacitance), a difference upper low impedance by-pass access in parallel,
Enhance low frequency filtering effect.
As a result, by adding low frequency trap wave unit, can more precisely, more reliably enhance filter effect, and structure is simple.
Optionally, the structure of the second low frequency trap wave unit is identical as the first low frequency trap wave unit.Alternatively, institute
The resonance frequency for stating the second low frequency trap wave unit is staggered setting value with the resonance frequency of the first low frequency trap wave unit.
Such as: the element value of the second trap branch (such as the second low frequency trap wave unit) can be with the first trap branch (such as
First low frequency trap wave unit) element value it is identical, the element value of the second trap branch can also be finely tuned, so that the first trap
The resonance frequency of branch and the second trap branch is slightly staggered, and to realize trap effect in bigger bandwidth, while overcoming device
The problem of part parameter consistency, the range that resonance frequency is staggered is generally in 50kHz-400kHz.
As a result, by forms such as structure, the parameters of the different low frequency trap wave units of setting, the low frequency of different occasions can satisfy
Filtering demands, it is flexibly and reliable.
It is total by providing low frequency using series resonance principal using technical solution of the present invention through a large amount of verification experimental verification
The low impedance by-pass access of mould interference, is achieved at low cost filtering out for low-frequency range mutual sensitized.
According to an embodiment of the invention, additionally providing a kind of electrical equipment corresponding to low-frequency range filter.The electric appliance
Equipment may include: above-described low-frequency range filter.
In an optional embodiment, in order to be achieved at low cost the conduction of low-frequency range (150kHz- about 700kHz) common mode
Electromagnetic interference filters out, the solution of the present invention, provides a kind of low-frequency range conduction common mode interference trap circuit and household electrical appliance, makes to filter
Wave device order is reduced, and power supply line outlet magnet ring is reduced, the decline of circuit devcie cost.
In an optional example, the solution of the present invention provides the low-resistance of low frequency common interference using series resonance principal
Anti- bypass path can solve to improve low-frequency range common mode filtering performance the problem of device cost is significantly increased, reach
The effect of device cost is reduced in the case where improving low-frequency range common mode filtering performance.
In an optional specific embodiment, Fig. 1 may refer to example shown in fig. 5, to the solution of the present invention
Specific implementation process illustrates.
In general filter circuit design, often circuit form is designed as shown in figure 3, generally using second level topology filtered electrical
Road, the common mode filtering electricity being made of two groups of common mode chokes (such as the first common mode choke and the second common mode choke) and Y capacitance
Road.In Fig. 3, the first common mode capacitance Y1 (such as Y capacitance), the second common mode capacitance Y2 (such as Y capacitance) are used as common mode filtering work
With being filtered to common mode interference.
A kind of specific implementation case is enumerated, using in the circuit of routine secondary filter shown in Fig. 3, measures its Conducted EMI result
Such as Fig. 4 (low frequency 150kHz nearby allowance there was only 4dB), usually its rectify and improve means be adjustment choke coil specification/replacement magnet ring specification/
Increasing Y capacitance capacitance/add level-one filtering again, is allowed to Conducted EMI final effect such as Fig. 5；If the low frequency common using Fig. 1 structure is fallen into
After wave circuit (its equivalent rectification principle is to increase Y capacitance capacitance), it is possible to reduce use a common mode choke, select low frequency
The good ferrite of inhibitory effect/amorphous common mode choke, and it is adjustable using 1-2 magnet ring according to the actual situation, it selects non-
Crystalline substance/nanocrystalline material guarantees high-frequency suppressing effect, be finally reached effect as shown in Figure 5 (the neighbouring allowance 12dB of low frequency 150K Hz,
Promote 8 dB allowances).In Fig. 4, Fig. 5, RBW indicates bandwidth, and MT indicates that whole flyback time, Att 10dB AUTO 10dB indicate certainly
Dynamic decaying.
Low-frequency range trap circuit (such as the first trap branch), principle is as shown in Figure 1.The low frequency trap circuit may include:
One group of boosting capacitor connects L line and N line respectively, is grounded again after connecting with trap inductance and trap resistance.Boosting capacitor and trap electricity
Sense composition series resonant tank, resonance center frequeH are typically but not limited between 100kHz-500kHz.
In Fig. 1, boosting capacitor (such as the first boosting capacitor C1), trap inductance (such as the first trap inductance LL1), trap resistance
(such as the first trap resistance RL1) composition low impedance by-pass access, it is in parallel with first common mode capacitance Y1 (such as Y capacitance) to reduce its bypass
The impedance of access.In this way, on the first common mode capacitance Y1 (such as Y capacitance), a upper low impedance by-pass access in parallel, enhancing
Low frequency filtering effect.
Optionally, the usual value of boosting capacitor is between 0.1-10nF, using ceramics or thin film dielectrics capacitor.Boosting capacitor
Value is far smaller than common mode capacitance (such as Y capacitance) value, generates adverse effect to avoid boosting capacitor and Y capacitance parallel resonance.
Optionally, the general value of trap inductance is between 50uH-1mH, using nickel-zinc ferrite or MgZn ferrite, so that
The Q value of inductance is higher near trap frequency point.
Optionally, for the general value of trap resistance in 10-500 Ω, the notch bandwidth that can according to need adjusts trap resistance
Resistance value.If trap inductance uses manganese-zinc ferrite, ferrocart core, powder core, nanocrystalline, amorphous magnetic core, damaged in trap frequency magnetic core
It is larger to consume angle tangent, then can use core loss and generate damping, save series notch resistance.
It, can be in the second common mode capacitance Y2 (such as Y in order to make low frequency trap better effect in an optional specific example
Capacitor) at also trap branch in parallel, as shown in Figure 2.The element value of second trap branch (such as the second low frequency trap wave unit) can
With identical as the element value of the first trap branch (such as the first low frequency trap wave unit), the member of the second trap branch can also be finely tuned
Part value, so that the resonance frequency of the first trap branch and the second trap branch is slightly staggered, to realize in bigger bandwidth
Trap effect, while overcoming the problems, such as device parameters consistency, the range that resonance frequency is staggered is generally in 50kHz-400kHz.
In Fig. 2, boosting capacitor (such as the first boosting capacitor C1With the second boosting capacitor C2), trap inductance (such as the first trap electricity
Feel L1With the second trap inductance L2), trap resistance (such as the first trap resistance R1With the second trap resistance R2) composition low impedance by-pass
Access (such as the first trap branch and the second trap branch), respectively with the first common mode capacitance Y1 (such as Y capacitance), the second common mode capacitance
Y2 (such as Y capacitance) impedance in parallel for reducing its bypass path, enhances its low frequency filtering effect.In this way, in the first common mode capacitance Y1
On (such as Y capacitance), the second common mode capacitance Y2 (such as Y capacitance), a upper low impedance by-pass access in parallel, enhances low frequency respectively
Filter effect.
Optionally, in order to make filter effect more preferably, suitable magnet ring can be added in LN line, usually selects low-frequency range resistance
The higher high-conductive manganese-zinc ferrite magnet ring of anti-value or nanocrystalline, amorphous magnet ring, to enhance low frequency filtering effect.
The processing and function realized by the electrical equipment of the present embodiment essentially correspond to earlier figures 1 to shown in fig. 5
Embodiment, principle and the example of device, therefore not detailed place in the description of the present embodiment, may refer to the phase in previous embodiment
It speaks on somebody's behalf bright, this will not be repeated here.
It is total by providing low frequency using series resonance principal using technical solution of the present invention through a large amount of verification experimental verification
The low impedance by-pass access of mould interference, filter order are reduced, and power supply line outlet magnet ring is reduced, the decline of circuit devcie cost.
According to an embodiment of the invention, additionally providing a kind of low-frequency range filtering side of electrical equipment corresponding to electrical equipment
Method.The low-frequency range filtering method of the electrical equipment may include: by basic filter unit, to low-frequency range in power supply to be filtered
Except the common mode interference of frequency range part filtered out；By the first low frequency trap wave unit, to low-frequency range part in the power supply
Common mode interference provides the low impedance by-pass access of low frequency common interference.
Such as: it is filtered out to be achieved at low cost low-frequency range (150kHz- about 700kHz) mutual sensitized, this
The scheme of invention provides a kind of low-frequency range conduction common mode interference trap circuit and household electrical appliance, reduces filter order, power supply
Line outlet magnet ring is reduced, the decline of circuit devcie cost.Such as: the low-resistance of low frequency common interference is provided using series resonance principal
Anti- bypass path can solve to improve low-frequency range common mode filtering performance the problem of device cost is significantly increased, reach
The effect of device cost is reduced in the case where improving low-frequency range common mode filtering performance.
Low frequency filtering effect can be enhanced in being equipped with by basic filter unit and the first low frequency trap wave unit as a result,
Fruit enhances the effect of filtering common mode Conducted Electromagnetic Interference.
The processing and function realized by the method for the present embodiment essentially correspond to the embodiment of aforementioned electrical equipment, original
Reason and example, therefore not detailed place in the description of the present embodiment, may refer to the related description in previous embodiment, do not do herein
It repeats.
Through a large amount of verification experimental verification, using the technical solution of the present embodiment, by providing low frequency using series resonance principal
The low impedance by-pass access of common mode interference reduces device cost in the case where improving low-frequency range common mode filtering performance, and reliable
Property is good.
To sum up, it will be readily appreciated by those skilled in the art that under the premise of not conflicting, above-mentioned each advantageous manner can be certainly
It combined, be superimposed by ground.
The above description is only an embodiment of the present invention, is not intended to restrict the invention, for those skilled in the art
For member, the invention may be variously modified and varied.All within the spirits and principles of the present invention, it is made it is any modification,
Equivalent replacement, improvement etc., should be included within scope of the presently claimed invention.
Claims (10)
1. a kind of low-frequency range filter characterized by comprising basic filter unit and the first low frequency trap wave unit；It is described
First low frequency trap wave unit is arranged in the basic filter unit；Wherein,
The basic filter unit is filtered for the common mode interference to frequency range part except low-frequency range in power supply to be filtered
It removes；
The first low frequency trap wave unit provides low frequency common interference for the common mode interference to low-frequency range part in the power supply
Low impedance by-pass access.
2. the apparatus according to claim 1, which is characterized in that the basic filter unit, comprising: the first magnet ring, first
Common mode choke, the first common mode capacitance and the second common mode capacitance；Wherein,
First magnet ring, is arranged at L, N line of the electric power incoming line of the power supply；
The first low frequency trap wave unit, first common mode capacitance and second common mode capacitance, it is successively parallel to be arranged in electricity
Between L, N line and ground wire of source inlet wire, and the first low frequency trap wave unit is located at first magnet ring and first common mode
Between capacitor；
First common mode choke, is arranged on L, N line of electric power incoming line, and is located at first common mode capacitance and described the
Between two common mode capacitances.
3. the apparatus of claim 2, which is characterized in that first magnet ring, comprising: impedance value is more than preset value
Low-frequency range magnet ring；The low-frequency range magnet ring, comprising: high-conductive manganese-zinc ferrite magnet ring or nanocrystalline, amorphous magnet ring.
4. device according to claim 2 or 3, which is characterized in that the first low frequency trap wave unit, comprising: first falls into
Wave boosting capacitor and the first low frequency trap inductance；Wherein,
The common end of the first trap boosting capacitor is grounded after the first low frequency trap inductance.
5. device according to claim 4, which is characterized in that the first low frequency trap wave unit, further includes: the first low frequency
Trap resistance；Wherein,
The common end of the first trap boosting capacitor, successively through the first low frequency trap inductance and the first low frequency trap
It is grounded after resistance.
6. device according to claim 4, which is characterized in that the capacitance of first boosting capacitor is less than described the
The capacitance of one common mode capacitance；
And/or
First boosting capacitor, comprising: ceramic electrical perhaps thin-film capacitor.
7. device described in one of -3 according to claim 1, which is characterized in that further include: the second low frequency trap wave unit；
The second low frequency trap wave unit, is arranged between L, N line of power outlet and ground wire, and it is single to be located at the basic filtering
Side of the member far from the power supply.
8. device according to claim 7, which is characterized in that the structure of the second low frequency trap wave unit, with described
One low frequency trap wave unit is identical；
Alternatively,
The resonance frequency of the second low frequency trap wave unit is staggered setting with the resonance frequency of the first low frequency trap wave unit
Value.
9. a kind of electrical equipment characterized by comprising low-frequency range filter a method as claimed in any one of claims 1-8.
10. a kind of low-frequency range filtering method of electrical equipment as claimed in claim 9 characterized by comprising
By basic filter unit, the common mode interference of frequency range part except low-frequency range in power supply to be filtered is filtered out；
By the first low frequency trap wave unit, the low of low frequency common interference is provided to the common mode interference of low-frequency range part in the power supply
Impedance bypass access.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910718258.8A CN110336542A (en) | 2019-08-05 | 2019-08-05 | A kind of low-frequency range filter, electrical equipment and its low-frequency range filtering method |
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| CN201910718258.8A CN110336542A (en) | 2019-08-05 | 2019-08-05 | A kind of low-frequency range filter, electrical equipment and its low-frequency range filtering method |
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| CN110336542A true CN110336542A (en) | 2019-10-15 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201910718258.8A Pending CN110336542A (en) | 2019-08-05 | 2019-08-05 | A kind of low-frequency range filter, electrical equipment and its low-frequency range filtering method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112731017A (en) * | 2020-12-21 | 2021-04-30 | 北京无线电计量测试研究所 | Device for measuring and rectifying conduction emission items of power line |
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2019
- 2019-08-05 CN CN201910718258.8A patent/CN110336542A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112731017A (en) * | 2020-12-21 | 2021-04-30 | 北京无线电计量测试研究所 | Device for measuring and rectifying conduction emission items of power line |
| CN112731017B (en) * | 2020-12-21 | 2023-04-11 | 北京无线电计量测试研究所 | Device for measuring and rectifying conduction emission items of power line |
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