CN205622500U - Filtering system - Google Patents
Filtering system Download PDFInfo
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- CN205622500U CN205622500U CN201620355377.3U CN201620355377U CN205622500U CN 205622500 U CN205622500 U CN 205622500U CN 201620355377 U CN201620355377 U CN 201620355377U CN 205622500 U CN205622500 U CN 205622500U
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Abstract
The utility model discloses a filtering system. Wherein, this filtering system includes: filter circuit for interfering signal among the suppression circuit, the controller is connected with the filter circuit electricity for adjust common mode inductance and/or differential mode choke's inductance value among the filter circuit through control signal, wherein, control signal confirms according to current source impedance of filter circuit and load impedance. The utility model provides a have in the technique when using the electromagnetic interference of wave filter in coming suppression circuit because that the impedance in the circuit is influenced by environment and power is great, lead to restraining the technical problem of electromagnetic interference's effect unstability.
Description
Technical field
This utility model relates to circuit field, in particular to a kind of filtering system.
Background technology
Along with electronic product and the extensive application of the converting means relevant to power electronic devices so that in circuit
EMI (Electromagnetic Interference, electromagnetic interference) is day by day serious, and power line is to disturb incoming equipment
With spread out of the main path of equipment, by power line, the interference of electrical network can be with incoming equipment, the normal work of jamming equipment
Making, the interference that same equipment produces is likely to pass on electrical network by power line, disturbs the normal work of other equipment,
Particularly transient noise interference, its rate of climb is fast, the persistent period is short, voltage amplitude amplitude high, randomness is strong, to micro-
Machine and digital circuit are easily generated severe jamming, often make people hard to guard against.
Often interfere with signal and be divided into common mode interference signal and the big class of differential mode interference signal two.Aerial condutor carries the process of transmission
Middle meeting is radiated by surrounding space electromagnetic environment, live wire, center line and go up amplitude and the phase of the signal sensed safely
Position is almost the most equal, owing to safety line to be connected with the earth, so being the formation of live wire, center line and safely
Between common mode disturbances；The a certain equipment in the distinct device of a power transmission line that shares is when switching over operation, live wire and in
Can form between line that amplitude is roughly equal and the signal of opposite in phase, this signal is exactly differential mode interference.Need for this
Adding electromagnetic interface filter at the electric power incoming line of equipment, electromagnetic interface filter is a kind of low pass filter, only allows equipment normal
Service frequency signal (such as: power frequency 50Hz, 60Hz or intermediate frequency 400Hz) enters load equipment, and to high frequency
Interference signal has bigger inhibition.
The most important technical specification of electromagnetic interface filter is the rejection ability to interference, i.e. the insertion loss of electromagnetic interface filter,
Its definition is: is not transferred to the power of load from interference source when accessing wave filter and accesses after wave filter from interference source
Be transferred to the power ratio of load, and the network parameter of the insertion loss of electromagnetic interface filter and filter network and source and
The impedance of load end is correlated with, but during actual application, the source impedance in circuit and load impedance are by environment and power
Impact relatively big, be variable, therefore electromagnetic interface filter insertion loss in circuit unstable, i.e. wave filter exists
The effect of consistent electromagnetic interference instability in circuit.
For in prior art when the electromagnetic interference using wave filter to come in suppression circuit, owing to the impedance in circuit is subject to
Environment and power impact are relatively big, the problem causing suppressing the effect instability of electromagnetic interference, the most not yet propose effective
Solution.
Utility model content
This utility model embodiment provides a kind of filtering system, at least to have solved using wave filter to press down in technology
During electromagnetic interference in circuit processed, owing to the impedance in circuit is affected relatively big by environment and power, cause suppressing electromagnetism to do
The technical problem that the effect disturbed is unstable.
An aspect according to this utility model embodiment, it is provided that a kind of filtering system, including: filter circuit, use
Interference signal in suppression circuit；Controller, electrically connects with filter circuit, for adjusting filter by control signal
Common mode inductance in wave circuit and/or the inductance value of differential mode inductance, wherein, control signal is according to the current source of filter circuit
Impedance and load impedance determine.
From the foregoing, it will be observed that the application said system is by the interference signal in filter circuit suppression circuit, by with filtering
The controller of circuit electrical connection adjusts the electricity of the common mode inductance in filter circuit and/or differential mode inductance by control signal
Inductance value, wherein, control signal determines according to the current source impedance of filter circuit and load impedance.Such scheme is by obtaining
The source impedance of sense circuit and load impedance, obtain source impedance current with circuit and control signal corresponding to load impedance, then
The inductance value of the common mode inductance in circuit and/or differential mode inductance, therefore, the application provider is adjusted by control signal
Case makes the inductance value of the common mode inductance in filter circuit and/or differential mode inductance adjustable, due to the common mode inductance in filter circuit
And/or the inductance value of differential mode inductance can be carried out according to the source impedance of filter circuit and the change of input impedance accordingly
Adjusting, the scheme that therefore the application above-mentioned steps provides can be the change of environment or power in source impedance and load impedance
Change and in the case of producing variation, by the inductance value of the common mode inductance in filter circuit and/or differential mode inductance is adjusted
Whole, so that filter circuit has higher insertion loss, i.e. the interference in circuit there is is preferable inhibition, thus
Solve in prior art when the electromagnetic interference using wave filter to come in suppression circuit, owing to the impedance in circuit is by ring
Border and power impact are relatively big, cause the technical problem suppressing the effect instability of electromagnetic interference.
Accompanying drawing explanation
Accompanying drawing described herein is used for providing being further appreciated by of the present utility model, constitutes the part of the application,
Schematic description and description of the present utility model is used for explaining this utility model, is not intended that of the present utility model
Improper restriction.In the accompanying drawings:
Fig. 1 is the structure chart of the filtering system according to this utility model embodiment；
Fig. 2 is the topology diagram of a kind of EMI filter circuit according to prior art；
Fig. 3 (a) is the winding schematic diagram of a kind of optional differential mode inductance according to this utility model embodiment one；
Fig. 3 (b) is the winding schematic diagram of a kind of optional common mode inductance according to this utility model embodiment one；And
Fig. 4 is the circuit diagram of a kind of optional filtering system according to this utility model embodiment one.
Detailed description of the invention
In order to make those skilled in the art be more fully understood that this utility model scheme, real below in conjunction with this utility model
Execute the accompanying drawing in example, the technical scheme in this utility model embodiment is clearly and completely described, it is clear that institute
The embodiment described is only the embodiment of this utility model part rather than whole embodiments.Based on this practicality
Embodiment in novel, those of ordinary skill in the art obtained under not making creative work premise all its
His embodiment, all should belong to the scope of this utility model protection.
It should be noted that term " first " in specification and claims of the present utility model and above-mentioned accompanying drawing,
" second " etc. are for distinguishing similar object, without being used for describing specific order or precedence.Should manage
Solve the data so used can exchange in the appropriate case, in order to embodiment of the present utility model described herein can
Implement with the order in addition to those here illustrating or describing.Additionally, term " includes " and " having " with
And their any deformation, it is intended that cover non-exclusive comprising, such as, contain a series of unit system,
Product or equipment are not necessarily limited to those steps or the unit clearly listed, but can include the most clearly listing or
For other unit that these products or equipment are intrinsic.
Embodiment one
Fig. 1 is the structure chart of the filtering system according to this utility model embodiment, as it is shown in figure 1, this system includes:
Filter circuit 10 and controller 12, wherein,
Filter circuit 10, the interference signal in suppression circuit.
Controller 12, electrically connects with filter circuit, for being adjusted the common mode inductance in filter circuit by control signal
And/or the inductance value of differential mode inductance, wherein, control signal determines according to the current source impedance of filter circuit and load impedance.
In a kind of optional embodiment, above-mentioned filter circuit can be EMI filter circuit, and Fig. 2 is according to existing skill
A kind of topology diagram of the EMI filter circuit of art, shown in Fig. 2, L1 is differential mode inductance, and L2 is common mode inductance,
Cx is differential mode inductance, and Cy is common mode inductance, and the high frequency that the high-frequency interferencing signal producing power supply and load produce is done
Disturb signal and all there is inhibition.
In above-mentioned steps, source impedance can be the impedance of power source internal, such as, is connected with electrical network at above-mentioned wave filter
Time, source impedance can be electric network impedance, and load impedance is the impedance of load equipment, such as, the air-conditioning that is connected with electrical network,
The impedance of refrigerator.
From the foregoing, it will be observed that the application said system is by the interference signal in filter circuit suppression circuit, by with filtered electrical
The controller of road electrical connection adjusts the inductance of the common mode inductance in filter circuit and/or differential mode inductance by control signal
Value, wherein, control signal determines according to the current source impedance of filter circuit and load impedance.Such scheme is by obtaining
The source impedance of circuit and load impedance, obtain source impedance current with circuit and control signal corresponding to load impedance, then lead to
Crossing control signal to the common mode inductance adjusting in circuit and/or the inductance value of differential mode inductance, therefore, the application provides scheme
The inductance value making the common mode inductance in filter circuit and/or differential mode inductance is adjustable, due to the common mode inductance in filter circuit and
/ or the inductance value of differential mode inductance can adjust accordingly according to the source impedance of filter circuit and the change of input impedance
Whole, the scheme that therefore the application above-mentioned steps provides can be the change of environment or power in source impedance and load impedance
And in the case of producing variation, by the inductance value of the common mode inductance in filter circuit and/or differential mode inductance is adjusted,
So that filter circuit has higher insertion loss, i.e. the interference in circuit there is is preferable inhibition, thus solve
In prior art when using wave filter to carry out the electromagnetic interference in suppression circuit, due to impedance in circuit by environment and
Power impact is relatively big, causes the technical problem suppressing the effect instability of electromagnetic interference.
Optionally, in this utility model above-described embodiment, the iron core of differential mode inductance is around with the first DC control winding.
Fig. 3 (a) is the winding schematic diagram of a kind of optional differential mode inductance according to this utility model embodiment one.One
Planting in optional embodiment, in conjunction with Fig. 3 (a) Suo Shi, iron core uses tubular structure, and adjustable differential mode inductance is along tubular iron
In-core is around with DC control winding, is wound with exchange main winding along tubulose iron core periphery.
Optionally, in this utility model above-described embodiment, the tubular iron in-core of common mode inductance is around with the second direct current control
Winding processed.
Fig. 3 (b) is the winding schematic diagram of a kind of optional common mode inductance according to this utility model embodiment one.One
Planting in optional embodiment, in conjunction with Fig. 3 (b) Suo Shi, common mode inductance is around with exchange along tubular iron in-core and controls winding,
Direct current main winding, alternating current-direct current winding and corresponding alternating current-direct current magnetic flux thereof it is wound with mutually orthogonal along tubulose iron core periphery.Cause
This, alternating current-direct current magnetic flux is independent of each other, and DC current does not interferes with the linear characteristic of reactor.
Optionally, in this utility model above-described embodiment, said system also includes:
Multiple sensors, electrically connect with source and the load end of filter circuit, for obtaining the control of source and load end
Parameter, wherein, controls parameter and includes: voltage, electric current and/or phase place.
In said system, system uses source and the control parameter of load end of multiple sensor acquisition filter circuits.
The sensor can be current sensor, voltage sensor or current/voltage sensor.
Fig. 4 is the circuit diagram of a kind of optional filtering system according to this utility model embodiment one, optional in one
In embodiment, shown in Fig. 4.Phase line and zero line are both provided with current/voltage at source and the load end of filtering system
Sensor, to obtain the control parameter of filtering system.
Controller is additionally operable to the control parameter by source and load end and obtains the current source impedance of filter circuit and load resistance
Anti-.
From the foregoing, it will be observed that the application said system is by the source of multiple sensor acquisition filter circuits and the control of load end
Parameter, wherein, controls parameter and at least includes: electric current, voltage and/or phase place, and use control parameter by controller
Obtain the source impedance of source and the load impedance of load end.Such scheme achieves and obtains source impedance and load impedance in real time
Technique effect, and then enable the controller to determine control signal according to source impedance and load impedance.
Optionally, in this utility model above-described embodiment, said system also includes:
First DC source, electrically connects with controller and the first direct current winding, for exporting the first direct current to differential mode circuit
Electricity；And/or,
Second DC source, electrically connects with controller and the second direct current winding, for exporting the second direct current to common-mode circuit
Electricity；
Wherein, controller is additionally operable to input to the first DC source and/or the second DC source control signal.
In said system, control circuit can be superimposed upon on inductance by the way of direct current winding, for common mode inductance,
Can be at the outer coiling direct current winding of the pile tube iron core of common mode inductance, for differential mode inductance, can tubular iron in-core outer around
Direct current winding processed.The electric current that controls after regulating according to control signal passes through the winding on common mode inductance and/or differential mode inductance
For inductance superposition D.C. magnetic field.
In said system, when regulation controls size of current change, control electric current and be superimposed upon common mode inductance and/or differential mode
D.C. magnetic field on inductance changes so that the pcrmeability of inductance change.
In said system, DC source controls electric current for the control signal according to controller output to inductance output,
Wherein, the control signal that the size controlling electric current of DC source output is exported by controller determines.
From the foregoing, it will be observed that control signal is inputted to DC source by the application above-mentioned steps, wherein, control signal is used for adjusting
The power supply size of joint DC source, generates and controls electric current.Such scheme to control electricity to inductance output by DC source
Stream, the control signal exported by controller is controlled DC source output and controls the size of electric current, it is achieved thereby that logical
Cross control signal to regulate the technique effect of the pcrmeability of inductance.
Optionally, in this utility model above-described embodiment, above-mentioned filter circuit includes:
Differential mode circuit, is connected with electrical network, for suppressing the differential mode interference signal in interference signal.
Common-mode circuit, electrically connects with differential mode circuit, for suppressing the common mode interference signal in interference signal.
Herein it should be noted that this utility model above-described embodiment provide filtering system in, common-mode circuit and difference
The difference of moding circuit is, direct and load in series in differential mode circuit.
Optionally, in this utility model above-described embodiment, above-mentioned differential mode circuit includes:
First differential mode capacitor, is connected between the zero line of electrical network and phase line.
Second differential mode capacitor, is connected between the zero line of electrical network and phase line.
Differential mode capacitor refers to the capacitor for following occasion, i.e. when after this capacitor failure, is not result in staff
Suffer electric shock, do not jeopardize personal safety.In actual applications, differential mode capacitor device is connected on single phase poaer supply line ground phase line and zero
Between line, differential mode capacitor, in addition to added with rated voltage, also can be superimposed with between phase line and zero line the various signal peaks existed
Threshold voltage.
Differential mode inductance, is connected in series between the first differential mode capacitor and the second differential mode capacitor, is used for suppressing to disturb in signal
Differential mode interference signal.
In this utility model said system, differential mode capacitor is in the case of ac frequency is certain, and inductance value is the biggest,
The biggest to the obstruction ability of alternating current, inductance value is the least, and it hinders ability the least.In the case of inductance value is certain,
The frequency of alternating current is the highest, and inductance is the biggest to the obstruction ability of alternating current, and frequency is the lowest, the inductance resistance to alternating current
Hinder ability the least, thus serve the technique effect of the differential mode interference signal in suppression circuit.
Root is optional, and in this utility model above-described embodiment, above-mentioned common-mode circuit includes:
First common mode capacitance, the first end of the first common mode capacitance is connected to the phase line of electrical network, the second of the first common mode capacitance
End ground connection.
Second common mode capacitance, the first end of the second common mode capacitance is connected to the zero line of electrical network, the second of the second common mode capacitance
End ground connection.
Common mode capacitance is arranged between the phase line of power supply supply lines, zero line and ground, needs common mode electricity in filter circuit
The capacitance held limits, thus reaches to control under assigned frequency voltage effect, limits leakage current and (i.e. flows through
State the electric current of common mode capacitance) the technique effect of size.
Common mode inductance, is connected in series between multiple common mode capacitance and load, for suppressing the common mode in interference signal to do
Disturb signal.
In this utility model said system, the filter circuit of common mode inductance, when the normal signal in circuit is by above-mentioned
During common mode inductance, electric current produces reverse magnetic field in the inductance coil of same phase coiling and cancels out each other, the most normally
Signal code is mainly affected by coil resistance；When there being common mode interference signal to pass through above-mentioned common mode inductance, due to common mode
The same tropism of electric current, can produce magnetic field in the same direction in coil and increase the induction reactance of coil, make coil show as high impedance,
Produce stronger damping, it is achieved thereby that the effect of common mode interference signal in attenuator circuit.
Optionally, in this utility model above-described embodiment, above-mentioned differential mode inductance is according to first after the regulation received
Unidirectional current adjusts pcrmeability.
In this utility model said system, inductance is when without superposition D.C. magnetic field, and the pcrmeability of iron core is the highest, i.e. electricity
Inductance value is maximum, and when D.C. magnetic field strengthens, the iron core pcrmeability in AC magnetic field direction can decline, so that inductance
Inductance value reduce.Therefore, in a kind of optional embodiment, above-mentioned differential mode inductance superposition DC magnetic can be adopted as
The pcrmeability of above-mentioned inductance is adjusted by the mode of field.
Optionally, in this utility model above-described embodiment, above-mentioned common mode inductance is according to second after the regulation received
Unidirectional current adjusts pcrmeability.
In this utility model said system, in said system, inductance when without superposition D.C. magnetic field, the magnetic of iron core
Conductance is the highest, i.e. inductance value is maximum, and when D.C. magnetic field strengthens, the iron core pcrmeability in AC magnetic field direction can decline,
So that the inductance value of inductance reduces.Therefore, in a kind of optional embodiment, above-mentioned common mode electricity can be adopted as
The pcrmeability of above-mentioned inductance is adjusted by the mode of sense superposition D.C. magnetic field.
Optionally, in this utility model above-described embodiment, above-mentioned filter circuit also includes:
Bleeder resistance, in parallel with the second common mode capacitance, for discharging common mode electricity in the case of filter circuit quits work
The electric energy of one or more common mode capacitance storage in road.
Shown in Fig. 4, R is bleeder resistance, and the resistance of R is higher, filtering system by duty change to
In the case of out-of-work state, the resistance R in filtering system release rapidly the electricity being stored in Cx, with
Exempt from the electricity electric shock operator in Cx.
From the foregoing, it will be observed that the bleeder resistance in the filtering system of this utility model above-described embodiment offer achieves in filtering system
The technique effect of vent discharge electricity capacity when system quits work, thus ensure that the safety of operator or user of service.
Herein it should be noted that the circuit of wave filter is passive network, it has reciprocity.Shown in Fig. 4,
Load both can have been received the power end (Lin, Nin end) of filtering, it is also possible to load is received load end (Lout,
Nout end), especially when the internal resistance of source (source impedance) is equal with load resistance (load impedance), this interchangeability is surveyed
The insertion loss obtained also is equal.
Above-mentioned this utility model embodiment sequence number, just to describing, does not represent the quality of embodiment.
In above-described embodiment of the present utility model, the description to each embodiment all emphasizes particularly on different fields, in certain embodiment
There is no the part described in detail, may refer to the associated description of other embodiments.
In several embodiments provided herein, it should be understood that disclosed technology contents, can be passed through other
Mode realize.Wherein, device embodiment described above is only schematically, the division of the most described unit,
Can be that a kind of logic function divides, actual can have other dividing mode, the most multiple unit or assembly when realizing
Can in conjunction with or be desirably integrated into another system, or some features can be ignored, or does not performs.Another point, institute
The coupling each other shown or discuss or direct-coupling or communication connection can be by some interfaces, unit or mould
The INDIRECT COUPLING of block or communication connection, can be being electrical or other form.
The above is only preferred implementation of the present utility model, it is noted that for the common skill of the art
For art personnel, on the premise of without departing from this utility model principle, it is also possible to make some improvements and modifications, these
Improvements and modifications also should be regarded as protection domain of the present utility model.
Claims (11)
1. a filtering system, it is characterised in that including:
Filter circuit, the interference signal in suppression circuit；
Controller, electrically connects with described filter circuit, for being adjusted in described filter circuit by control signal
Common mode inductance and/or the inductance value of differential mode inductance, wherein, described control signal is current according to described filter circuit
Source impedance and load impedance determine.
System the most according to claim 1, it is characterised in that the iron core of described differential mode inductance is around with the first direct current
Control winding.
System the most according to claim 2, it is characterised in that the tubular iron in-core of described common mode inductance is around with
Two DC control windings.
4. according to the system described in Claims 2 or 3, it is characterised in that described system also includes:
Multiple sensors, electrically connect with source and the load end of described filter circuit, be used for obtaining described source and
The control parameter of described load end, wherein, described control parameter includes: voltage, electric current and/or phase place；
Controller is additionally operable to obtain described filter circuit by the described control parameter of described source and described load end
Current source impedance and load impedance.
System the most according to claim 4, it is characterised in that described system also includes:
First DC source, electrically connects with described controller and described first direct current winding, for differential mode circuit
Export the first unidirectional current；And/or,
Second DC source, electrically connects with described controller and described second direct current winding, for common-mode circuit
Export the second unidirectional current；
Wherein, described controller is additionally operable to the input of described control signal to described first DC source and/or second
DC source, to regulate described first unidirectional current of described first DC source output and/or to regulate described second straight
Described second unidirectional current of stream power supply output.
System the most according to claim 5, it is characterised in that described filter circuit includes:
Differential mode circuit, is connected with electrical network, for suppressing the differential mode interference signal in described interference signal；
Common-mode circuit, electrically connects with described differential mode circuit, for suppressing the common mode disturbances in described interference signal to believe
Number.
System the most according to claim 6, it is characterised in that described differential mode circuit includes:
First differential mode capacitor, is connected between zero line and the phase line of described electrical network；
Second differential mode capacitor, is connected between zero line and the phase line of described electrical network；
Described differential mode inductance, is connected in series between described first differential mode capacitor and described second differential mode capacitor, uses
In suppressing the differential mode interference signal in described interference signal.
System the most according to claim 7, it is characterised in that after described differential mode inductance is according to the regulation received
First unidirectional current adjusts pcrmeability.
System the most according to claim 6, it is characterised in that described common-mode circuit includes:
First common mode capacitance, the first end of described first common mode capacitance is connected to the phase line of described electrical network, and described
Second end ground connection of one common mode capacitance；
Second common mode capacitance, the first end of described second common mode capacitance is connected to the zero line of described electrical network, and described
Second end ground connection of two common mode capacitance；
Described common mode inductance, is connected in series between multiple common mode capacitance and load, is used for suppressing described interference letter
Common mode interference signal in number.
System the most according to claim 9, it is characterised in that after described common mode inductance is according to the regulation received
Second unidirectional current adjusts pcrmeability.
11. systems according to claim 10, it is characterised in that described filter circuit also includes:
Bleeder resistance, in parallel with described second common mode capacitance, in the out-of-work situation of described filter circuit
The electric energy of one or more common mode capacitance storage in the lower described common-mode circuit of release.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620355377.3U CN205622500U (en) | 2016-04-22 | 2016-04-22 | Filtering system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620355377.3U CN205622500U (en) | 2016-04-22 | 2016-04-22 | Filtering system |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107306079A (en) * | 2016-04-22 | 2017-10-31 | 珠海格力电器股份有限公司 | filtering method, system and device |
| WO2017211104A1 (en) * | 2016-06-08 | 2017-12-14 | 珠海格力电器股份有限公司 | Emi filter and power emi filter access circuit |
| CN113452241A (en) * | 2021-06-17 | 2021-09-28 | 珠海格力电器股份有限公司 | Common mode interference suppression device and frequency conversion electrical apparatus |
| CN113824298A (en) * | 2021-08-27 | 2021-12-21 | 广西电网有限责任公司电力科学研究院 | Power frequency power supply filter circuit |
-
2016
- 2016-04-22 CN CN201620355377.3U patent/CN205622500U/en active Active
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107306079A (en) * | 2016-04-22 | 2017-10-31 | 珠海格力电器股份有限公司 | filtering method, system and device |
| CN107306079B (en) * | 2016-04-22 | 2023-07-14 | 珠海格力电器股份有限公司 | Filtering method, system and device |
| WO2017211104A1 (en) * | 2016-06-08 | 2017-12-14 | 珠海格力电器股份有限公司 | Emi filter and power emi filter access circuit |
| CN107482896A (en) * | 2016-06-08 | 2017-12-15 | 珠海格力电器股份有限公司 | Electromagnetic interface filter and EMI power filter access circuit |
| CN113452241A (en) * | 2021-06-17 | 2021-09-28 | 珠海格力电器股份有限公司 | Common mode interference suppression device and frequency conversion electrical apparatus |
| CN113452241B (en) * | 2021-06-17 | 2022-08-16 | 珠海格力电器股份有限公司 | Common mode interference suppression device and frequency conversion electrical apparatus |
| CN113824298A (en) * | 2021-08-27 | 2021-12-21 | 广西电网有限责任公司电力科学研究院 | Power frequency power supply filter circuit |
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