CN107482900A - A kind of circuit for improving DC brushless motor EMC and the blower fan using the circuit - Google Patents
A kind of circuit for improving DC brushless motor EMC and the blower fan using the circuit Download PDFInfo
- Publication number
- CN107482900A CN107482900A CN201710945791.9A CN201710945791A CN107482900A CN 107482900 A CN107482900 A CN 107482900A CN 201710945791 A CN201710945791 A CN 201710945791A CN 107482900 A CN107482900 A CN 107482900A
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- China
- Prior art keywords
- circuit
- emc
- brushless motor
- late
- magnetic bead
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Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/44—Circuits or arrangements for compensating for electromagnetic interference in converters or inverters
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K11/00—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection
- H02K11/02—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection for suppression of electromagnetic interference
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- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
The invention discloses a kind of circuit for improving DC brushless motor EMC and the blower fan using the circuit.Described circuit includes power supply VCC interfaces, be connected in parallel after first, second the ground capacity C1, C2 that is grounded and the magnetic bead being arranged between power supply VCC interfaces and air-blower control plate.The present invention between power supply VCC interfaces and air-blower control plate by setting magnetic bead, conduction and radiation have obvious improvement in high-frequency range, the reduction of conduction and radiation also functions to obvious improvement to late-class circuit, solves EMC interference problems under conditions of pcb board circuit is not changed.
Description
Technical field
The present invention relates to electric and electronic technical field, more particularly to a kind of circuit for improving DC brushless motor EMC and make
With the blower fan of the circuit.
Background technology
Electro Magnetic Compatibility (Electro Magnetic Compatibility, abbreviation EMC) interference and a kind of environment are dirty
Dye, its He Shui, soil, gas pollution are the same, can cause bad influence in itself to the living environment of people and the mankind, or even cause
Directly harm.Because EMC interference can not directly be tasted, sees and smelt, so as to more mysterious, it may be said that it is ubiquitous, nothing
When do not exist.Any electric appliance and electronic equipment can all produce a certain degree of EMC interference, from it is small to electronic toy greatly to power system all
It is included.
In the control system for non-brush direct currunt electromotors, EMC interference turns into the problem of one of them is increasingly severe.For one
In the R ＆ D design of electric machine control system new projects, EMC must account for EMC in the design through whole process.At present
The DC fan of market application, due to different contour structures, installation dimension and running environment, the pcb board quilt for control
It is installed on built in being divided into external in motor（Or outside motor）.Generally DC brushless motor quotes identical principle, should
For the motor of different series various outer diameter, such as plastic packaging series, iron-clad series etc..And controlling pcb board is most worth in EMC technologies
The part that must be inquired into, it is equipment working frequency highest part, meanwhile, it is also often minimum, the most sensitive part of level.When
After the completion of the pcb board design of one product, the harassing and wrecking of its core circuit and immunity characteristic just have determined substantially.Want again
Improve the characteristic of its electromagnetic compatibility, it is necessary to which circuit is modified.
Therefore, the defects of for above-mentioned prior art existing, it is necessary to carry out developmental research in fact, to provide one kind side
Case, solve EMC interference problems under conditions of pcb board circuit is not changed.
The content of the invention
To solve existing technical problem, the present invention provides a kind of circuit for improving DC brushless motor EMC and made
With the blower fan of the circuit, solve EMC interference problems under conditions of pcb board circuit is not changed.
To reach above-mentioned purpose, the technical proposal of the invention is realized in this way：
A kind of circuit for improving DC brushless motor EMC, include power supply VCC interfaces, be connected in parallel after be grounded first, second
Ground capacity C1, C2 and the magnetic bead being arranged between power supply VCC interfaces and air-blower control plate.
Further, the equivalent circuit of the magnetic bead be an an inductance L and resistance R series connection, wherein, resistance R and
Inductance L value is all the function of frequency, and meets equation below：
Z=R（f）+jXL
Wherein, Z is impedance.
Further, VCC voltages enter the late-class circuit of blower fan control panel after magnetic bead filters, and pass through magnetic bead and rear class
Circuit collective effect, the voltage for having filtered out High-frequency Interference is assigned to late-class circuit, late-class circuit produced so as to reduce power supply
Ripple interference and EMC interference.
Further, the first, second ground capacity C1, C2 are used to surge current being released to ground, to avoid by wave
Gush the impact of electric current.
Further, resistance or capacitance component are provided with the late-class circuit of magnetic bead.
The present invention also proposes a kind of blower fan of the circuit using above-mentioned improvement DC brushless motor EMC, includes motor list
Body, the air-blower control plate for connecting motor monomer and the circuit for improving DC brushless motor EMC, wherein, the improvement direct current without
Brush motor EMC circuit is arranged at the VCC interface circuitry portions of air-blower control plate.
The beneficial effect of technical scheme provided by the invention is：
The present invention between power supply VCC interfaces and air-blower control plate by setting magnetic bead so that the conduction spoke of blower fan zero line live wire
Penetrating value reduces by 30%, is conducted in high-frequency range and radiation has obvious improvement, conducts and the reduction of radiation is to late-class circuit
Obvious improvement is played, solves EMC interference problems under conditions of pcb board circuit is not changed.
Brief description of the drawings
Technical solution of the present invention is described in detail below in conjunction with embodiment and accompanying drawing, wherein：
Fig. 1 is the principal diagram for the circuit that the embodiment of the present invention improves DC brushless motor EMC；
Fig. 2 is the characteristic schematic diagram of the magnetic bead in Fig. 1；
Fig. 3 is the impedance frequency characteristics curve map of the magnetic bead in Fig. 1；
The test fixture diagram that Fig. 4 is test EMC.
Embodiment
In order that those skilled in the art more fully understand the present invention program, below in conjunction with embodiment and accompanying drawing to this
Inventive technique scheme is clearly and completely described.Obviously, based on the embodiment in the present invention, those of ordinary skill in the art
The every other embodiment obtained under the premise of creative work is not made, should all belong to the scope of protection of the invention.
Shown in reference picture 1, the present invention improves DC brushless motor EMC circuit, includes power supply VCC interfaces, parallel connection even
First, second ground capacity C1, C2 being grounded after connecing and the magnetic bead being arranged between power supply VCC interfaces and air-blower control plate.
In the embodiment of the present invention, the equivalent circuit of the magnetic bead is an inductance L and resistance R series connection.Reference picture 2
It is shown, wherein, resistance R and inductance L value are all the functions of frequency, meet equation below：
Z=R（f）+jXL （1）
Wherein, Z is impedance.
Low-frequency range, impedance are made up of the induction reactance of inductance, and R very littles during low frequency, inductance is larger, and L plays a major role, electromagnetism [41]
Reflected and be suppressed, whole device is a high Q of low-loss inductance；High band, impedance are made up of resistance components, with
Frequency rise, the magnetic conductivity of magnetic core reduces, and causes the inductance value of inductance to reduce, induction reactance composition reduces.Resistance components increase, leads
Cause total impedance increase.When high-frequency signal by when, electromagnetic interference, which is absorbed and is converted into the form of heat energy, to be dissipated.VCC voltages
Enter the late-class circuit of blower fan control panel after magnetic bead filters, by magnetic bead and late-class circuit collective effect, height will have been filtered out
The voltage of frequency interference is assigned to late-class circuit, and ripple interference and EMC caused by late-class circuit are disturbed so as to reduce power supply.
Fig. 3 is the magnetic bead impedance frequency characteristics curve map of the present invention, as shown in figure 3, R-curve is the resistive impedance of magnetic bead
Characteristic curve, X profile are the emotional resistance characteristic curves of magnetic bead, and Z (R+jX) curve is the total impedance curve of magnetic bead.
As shown in figure 1, adding magnetic bead in VCC interface circuits, when extraneous power network access blower fan, power supply is passed through, blower fan starts
Operation, and corresponding adjustment of rotational speed is carried out according to the extraneous mainboard command information received, so as to reach corresponding requirement.Its
In, extraneous mainboard provides the light current power supply for being used for driving related chip by the VCC ends fan and late-class circuit of blower fan, makes wind
Machine normal work.When interface carries out surge test, surge current will be first by magnetic bead, then by first, second ground connection
Electric capacity C1, C2 is released to ground, so that impact of the rear stage interface chip from surge current or voltage.
The test fixture diagram that Fig. 4 is test EMC, includes base, the insulating support being installed on base, is supported in absolutely
Couple planar on edge support.EFT/B signal inputs are additionally provided with test fixture.Entered by the test fixture for testing EMC
Row test, test data contrast are as shown in table 1.
When DC fan input EFT is tested, fan power line is connected to artificial mains network, is grown by a regulation
1.5m extended line is connected with the DC output end of test fixture, and extended line is placed on the inside of two couple planars of coupling clip, arteries and veins
Rush interference voltage to be accessed by the signal input close to blower fan side, by coupling clip coupled on blower fan line.Extended line is necessary
Corresponded with blower fan line.When there is no magnetic bead, extraneous power supply by directly feeding late-class circuit after electric capacity, now extraneous power supply and
Controller of fan works asynchronously, and extraneous power grid high-frequency interference signal is introduced directly into blower fan system and and blower fan work(by interface circuit
Interference collective effect caused by rate module switch causes EMC to be above standard requirement in whole system.When having magnetic bead, extraneous power supply
After magnetic bead filters and with late-class circuit collective effect, the voltage for having filtered out High-frequency Interference is assigned to late-class circuit, so as to
Power supply is reduced to ripple interference and EMC interference problems caused by late-class circuit.Ginseng is shown in Table 1, and by test comparison, increases magnetic
Blower fan EMC after pearl is substantially improved and reaches requirement.
As another embodiment of the present invention, the late-class circuit increase of magnetic bead is provided with corresponding resistance or electric capacity member device
Part, further solves the problems, such as EMC.
As further embodiment of this invention, the equivalent circuit of the magnetic bead is an inductance L and resistance R parallel connection.
Improve the blower fan of DC brushless motor EMC circuit using the embodiment of the present invention, include motor monomer, connection electricity
The air-blower control plate of machine monomer and the circuit for improving DC brushless motor EMC, wherein, the improvement DC brushless motor EMC
Circuit be arranged at the VCC interface circuitry portions of air-blower control plate；Described motor monomer includes case component and installation
In case component stator module, rotor assembly.By being arranged such, the conduct radiation value of blower fan zero line live wire reduces by 30%, in height
Conduction and radiation improve significantly in the range of frequency, and the ripple value of interface circuit reduces by 20%.The reduction of conduction and radiation is to rear class
Circuit plays obvious improvement, can reduce interference to late-class circuit, such as Hall, single-chip microcomputer and IPM interference.Meanwhile line
Ripple also allows blower fan rear class chip operation to reduce the loss of chip in normal operating voltage after reducing.
The foregoing is only presently preferred embodiments of the present invention, be not intended to limit the invention, it is all the present invention spirit and
Within principle, any modification, equivalent substitution and improvements made etc., it should be included in the scope of the protection.
Claims (10)
- A kind of 1. circuit for improving DC brushless motor EMC, it is characterised in that including power supply VCC interfaces, be connected in parallel after be grounded First, second ground capacity C1, C2 and the magnetic bead being arranged between power supply VCC interfaces and air-blower control plate.
- 2. improve DC brushless motor EMC circuit according to claim 1, it is characterised in that the equivalent electric of the magnetic bead Lu Weiyi inductance L and resistance R series connection, wherein, resistance R and inductance L value are all the functions of frequency, and are met as follows Formula：Z=R（f）+jXLWherein, Z is impedance.
- 3. improve DC brushless motor EMC circuit according to claim 1, it is characterised in that VCC voltages are filtered by magnetic bead Enter the late-class circuit of blower fan control panel after ripple, by magnetic bead and late-class circuit collective effect, the electricity of High-frequency Interference will have been filtered out Pressure is assigned to late-class circuit, and ripple interference and EMC caused by late-class circuit are disturbed so as to reduce power supply.
- 4. improve DC brushless motor EMC circuit according to claim 1, it is characterised in that first, second ground connection Electric capacity C1, C2 is used to surge current being released to ground, to avoid being impacted by surge current.
- 5. improve DC brushless motor EMC circuit according to claim 1, it is characterised in that the equivalent electric of the magnetic bead Lu Weiyi inductance L and resistance R parallel connection.
- 6. according to any one of the claim 1-5 circuits for improving DC brushless motor EMC, it is characterised in that in magnetic bead Resistance or capacitance component are provided with late-class circuit.
- A kind of 7. blower fan of 1 circuit for improving DC brushless motor EMC of usage right requirement, it is characterised in that：Include Motor monomer, the air-blower control plate for connecting motor monomer and the circuit for improving DC brushless motor EMC, wherein, the improvement DC brushless motor EMC circuit is arranged at the VCC interface circuitry portions of air-blower control plate.
- 8. blower fan according to claim 7, it is characterised in that described motor monomer includes case component, Yi Jian Mounted in case component stator module, rotor assembly.
- 9. blower fan according to claim 7, it is characterised in that the magnetic in the circuit for improving DC brushless motor EMC The equivalent circuit of pearl is an inductance L and resistance R series connection, wherein, resistance R and inductance L value are all the functions of frequency, And meet equation below：Z=R（f）+jXLWherein, Z is impedance.
- 10. blower fan according to claim 7, it is characterised in that power supply VCC voltages are by improving DC brushless motor EMC Circuit in magnetic bead filtering after enter blower fan control panel late-class circuit, by magnetic bead and late-class circuit collective effect, by The voltage for filtering out High-frequency Interference is assigned to late-class circuit, and ripple interference and EMC caused by late-class circuit are done so as to reduce power supply Disturb.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710945791.9A CN107482900A (en) | 2017-10-12 | 2017-10-12 | A kind of circuit for improving DC brushless motor EMC and the blower fan using the circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710945791.9A CN107482900A (en) | 2017-10-12 | 2017-10-12 | A kind of circuit for improving DC brushless motor EMC and the blower fan using the circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107482900A true CN107482900A (en) | 2017-12-15 |
Family
ID=60606281
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710945791.9A Pending CN107482900A (en) | 2017-10-12 | 2017-10-12 | A kind of circuit for improving DC brushless motor EMC and the blower fan using the circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107482900A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108667224A (en) * | 2018-06-20 | 2018-10-16 | 核工业理化工程研究院 | Electromagnetic interference resistant device and electromagnetism interference method for high rotating speed DC brushless motor |
| CN113418601A (en) * | 2021-08-23 | 2021-09-21 | 深圳市力子光电科技有限公司 | Optical power detection module |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20070205846A1 (en) * | 2006-03-02 | 2007-09-06 | Hon Hai Precision Industry Co., Ltd. | Filter circuit |
| CN202475239U (en) * | 2012-03-01 | 2012-10-03 | 天津瑞能电气有限公司 | Filtering protection circuit applied to double-feed converter control system power supply |
| CN103457552A (en) * | 2013-08-30 | 2013-12-18 | 奇瑞汽车股份有限公司 | Amplification circuit for laser distance measuring receiving system |
| CN105486940A (en) * | 2014-09-17 | 2016-04-13 | 深圳Tcl数字技术有限公司 | Key detection circuit and key detection method of electronic equipment |
-
2017
- 2017-10-12 CN CN201710945791.9A patent/CN107482900A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20070205846A1 (en) * | 2006-03-02 | 2007-09-06 | Hon Hai Precision Industry Co., Ltd. | Filter circuit |
| CN202475239U (en) * | 2012-03-01 | 2012-10-03 | 天津瑞能电气有限公司 | Filtering protection circuit applied to double-feed converter control system power supply |
| CN103457552A (en) * | 2013-08-30 | 2013-12-18 | 奇瑞汽车股份有限公司 | Amplification circuit for laser distance measuring receiving system |
| CN105486940A (en) * | 2014-09-17 | 2016-04-13 | 深圳Tcl数字技术有限公司 | Key detection circuit and key detection method of electronic equipment |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108667224A (en) * | 2018-06-20 | 2018-10-16 | 核工业理化工程研究院 | Electromagnetic interference resistant device and electromagnetism interference method for high rotating speed DC brushless motor |
| CN113418601A (en) * | 2021-08-23 | 2021-09-21 | 深圳市力子光电科技有限公司 | Optical power detection module |
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| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20171215 |