CN106067731A - A kind of switch power supply EMI circuit - Google Patents
A kind of switch power supply EMI circuit Download PDFInfo
- Publication number
- CN106067731A CN106067731A CN201610542586.3A CN201610542586A CN106067731A CN 106067731 A CN106067731 A CN 106067731A CN 201610542586 A CN201610542586 A CN 201610542586A CN 106067731 A CN106067731 A CN 106067731A
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- China
- Prior art keywords
- circuit
- emi
- phase input
- phase
- isolated
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/44—Circuits or arrangements for compensating for electromagnetic interference in converters or inverters
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- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Filters And Equalizers (AREA)
Abstract
The invention discloses a kind of switch power supply EMI circuit, including rectified three-phase circuit, EMI filter circuit, DC circuit, high frequency voltage changing module, isolation circuit, non-isolated circuit, Y capacitance, magnetic bead, three-phase input end；By magnetic bead by the N phase input of three-phase input end and ground isolation, the interference signal preventing the measurement loop at MCU place from producing is directly connected to three-phase input end with passing through thus causes EMI to exceed standard；And bridging has Y capacitance between EMI filter circuit and the ground being connected with non-isolated circuit, filter for the interference signal that high frequency voltage changing module exports is rebooted EMI filter circuit from non-isolated circuit to ground, prevent EMI from disturbing circuit, thus have influence on the accuracy of three-phase intelligent electric-energy meter metering.
Description
Technical field
The present invention relates to field of switch power, be specifically related to a kind of switch power supply EMI circuit.
Background technology
Three-phase intelligent electric-energy meter is used to measure the instrument of electric energy, also known as kilowatt-hour meter, energy meter, kilowatt-hour table, refers to measure
The instrument of various electrical quantities；Generally individually have employed high-precision A/D transducer, the voltage of electrical network, current signal are sampled
And analog digital conversion, then utilize high speed microprocessor that digital signal is analyzed, process and data reprocessing, sorting, thus
Produce various continuous data；Various communication interface, man machine interface is finally utilized to realize docking with various equipment.
And in order to ensure the three-phase intelligent electric-energy meter accurate measurement to voltage, three-phase intelligent electric-energy meter is typically by metering circuit
With the ground of MCU and input carry out common；And main power source is according to Switching Power Supply, the output loop at MCU place interference letter
Number it is easy to be coupled to input by ground wire, causes the EMI of conduction to exceed standard；Nowadays three-phase intelligent electric-energy meter solves Conducted EMI
Super calibration method is for absorbing differential mode interference by increasing X electric capacity and differential mode inductance at input, but such solution
Must assure that three-phase intelligent electric-energy meter each phase input all must increase filter circuit, cause high cost, components and parts are too much,
Pcb board layout is inconvenient for.
Summary of the invention
The invention aims to provide one can reduce cost, solve EMI and exceed standard interference problem, beneficially PCB cloth
The switch power supply EMI circuit of office.
The present invention is achieved through the following technical solutions: a kind of switch power supply EMI circuit, it is characterised in that: include that three-phase is whole
Current circuit, EMI filter circuit, DC circuit, high frequency voltage changing module, isolation circuit, non-isolated circuit, Y capacitance, magnetic bead, three-phase
Input；The A phase input of described three-phase input end, B phase input, C phase input are all connected to rectified three-phase circuit, described
Rectified three-phase circuit is connected to EMI filter circuit, and described EMI filter circuit is connected to DC circuit, and described DC circuit connects
To high frequency voltage changing module, described high frequency voltage changing module is connected respectively to isolate circuit and non-isolated circuit, described non-isolated circuit
Connect ground；Being isolated by magnetic bead between N phase input and the ground of described three-phase input end, described EMI filter circuit is also by Y electricity
Hold ground connection；Described isolation circuit includes carrier module and 485 communication modules；Described non-isolated circuit include MCU, computation chip and
Measurement loop；Described Y capacitance is used for guiding interference signal to enter EMI filter circuit and filters.
The present invention by the N phase input of three-phase input end and ground isolation, prevents the measurement loop at MCU place from producing by magnetic bead
Raw interference signal is directly connected to three-phase input end with passing through thus causes EMI to exceed standard；And in EMI filter circuit with non-
Between the ground that isolation circuit connects, bridging has Y capacitance, and the interference signal being used for exporting high frequency voltage changing module is from non-isolated circuit
To reboot EMI filter circuit and filter, prevent EMI from disturbing circuit, thus have influence on the standard of three-phase intelligent electric-energy meter metering
Really property.
The invention have benefit that: 1) by magnetic bead isolation N phase input and ground, prevent the metering at MCU place from returning
The interference signal that road produces is directly connected to three-phase input end with passing through thus causes EMI to exceed standard；2) EMI filter circuit and with
Between the ground that non-isolated circuit connects, bridging has Y capacitance for guiding interference signal to filter；3) three-phase input end is reduced every
The filter circuit of one phase, reduces cost, reduces components and parts, beneficially PCB layout.
Accompanying drawing explanation
Fig. 1 is the module diagram of the present invention.
Detailed description of the invention
Below in conjunction with the accompanying drawings with detailed description of the invention, the invention will be further described.
See Fig. 1, a kind of switch power supply EMI circuit, it is characterised in that: include rectified three-phase circuit, EMI filter circuit, straight
Current circuit, high frequency voltage changing module, isolation circuit, non-isolated circuit, Y capacitance, magnetic bead, three-phase input end；Described three-phase input end
A phase input, B phase input, C phase input be all connected to rectified three-phase circuit, described rectified three-phase circuit is connected to EMI
Filter circuit, described EMI filter circuit is connected to DC circuit, and described DC circuit is connected to high frequency voltage changing module, described height
Frequently voltage changing module is connected respectively to isolate circuit and non-isolated circuit, and described non-isolated circuit connects ground；Described three-phase input end
N phase input and ground between isolated by magnetic bead, described EMI filter circuit is also by Y capacitance ground connection；Described isolation circuit bag
Include carrier module and 485 communication modules；Described non-isolated circuit includes MCU, computation chip and measurement loop；Described Y capacitance is used
Filter in guiding interference signal to enter EMI filter circuit.
In present embodiment, the A phase input of three-phase input end, B phase input and the output of C phase input are directly by three
Commutating phase circuit is to EMI filter circuit, it is not necessary to increases filter circuit again before each input and is filtered, and three-phase input end
N phase input and the ground being connected with non-isolated circuit directly isolated by magnetic bead, due to magnetic bead DC impedance at low frequency very
Little, the metering of electric energy meter will not be produced interference, the interference signal of the measurement loop generation preventing from MCU place is straight by ground
Receive three-phase input end in succession thus cause EMI to exceed standard；And between EMI filter circuit and the ground being connected with non-isolated circuit
Bridging has Y capacitance, so that the interference signal of high frequency voltage changing module output by passing through is drawn by Y capacitance from non-isolated circuit
Leading in EMI filter circuit and filter, described EMI filter circuit is former limit wave filter；So use magnetic bead and Y capacitance solution by no means every
From the EMI problem of Switching Power Supply, filter circuit is transferred to rectified three-phase circuit rear end from three-phase input end, saves 2/3
EMI filters components and parts, reduces cost, the layout of beneficially PCB.
Protection scope of the present invention includes but not limited to embodiment of above, and protection scope of the present invention is with claims
It is as the criterion, replacement that any those skilled in the art making this technology is readily apparent that, deforms, improve and each fall within the present invention's
Protection domain.
Claims (4)
1. a switch power supply EMI circuit, it is characterised in that: include rectified three-phase circuit, EMI filter circuit, DC circuit, height
Frequently voltage changing module, isolation circuit, non-isolated circuit, Y capacitance, magnetic bead, three-phase input end；The A phase of described three-phase input end inputs
End, B phase input, C phase input are all connected to rectified three-phase circuit, and described rectified three-phase circuit is connected to EMI filter circuit,
Described EMI filter circuit is connected to DC circuit, and described DC circuit is connected to high frequency voltage changing module, described high frequency voltage changing module
Being connected respectively to isolate circuit and non-isolated circuit, described non-isolated circuit connects ground；The N phase input of described three-phase input end
And being isolated by magnetic bead between ground, described EMI filter circuit is also by Y capacitance ground connection.
A kind of switch power supply EMI circuit the most according to claim 1, it is characterised in that: described isolation circuit includes carrier wave
Module and 485 communication modules.
A kind of switch power supply EMI circuit the most according to claim 1, it is characterised in that: described non-isolated circuit includes
MCU, computation chip and measurement loop.
A kind of switch power supply EMI circuit the most according to claim 1, it is characterised in that: described Y capacitance is used for guiding interference
Signal enters EMI filter circuit and filters.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610542586.3A CN106067731A (en) | 2016-07-12 | 2016-07-12 | A kind of switch power supply EMI circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610542586.3A CN106067731A (en) | 2016-07-12 | 2016-07-12 | A kind of switch power supply EMI circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106067731A true CN106067731A (en) | 2016-11-02 |
Family
ID=57207617
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610542586.3A Pending CN106067731A (en) | 2016-07-12 | 2016-07-12 | A kind of switch power supply EMI circuit |
Country Status (1)
| Country | Link |
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| CN (1) | CN106067731A (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201247269Y (en) * | 2008-08-22 | 2009-05-27 | 宁波三星电气股份有限公司 | Electric energy meter |
| CN203243226U (en) * | 2013-04-11 | 2013-10-16 | 杭州海兴电力科技股份有限公司 | Switch power source |
| CN104104216A (en) * | 2014-07-23 | 2014-10-15 | 孟加顷 | Switch power source filtering circuit |
| CN203911818U (en) * | 2014-05-19 | 2014-10-29 | 美的集团股份有限公司 | A DC motor and a drive circuit thereof |
| CN203933388U (en) * | 2014-06-16 | 2014-11-05 | 邯郸美的制冷设备有限公司 | A kind of for suppressing electromagnetic interference filter circuit and the air conditioner of resonance peak |
-
2016
- 2016-07-12 CN CN201610542586.3A patent/CN106067731A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201247269Y (en) * | 2008-08-22 | 2009-05-27 | 宁波三星电气股份有限公司 | Electric energy meter |
| CN203243226U (en) * | 2013-04-11 | 2013-10-16 | 杭州海兴电力科技股份有限公司 | Switch power source |
| CN203911818U (en) * | 2014-05-19 | 2014-10-29 | 美的集团股份有限公司 | A DC motor and a drive circuit thereof |
| CN203933388U (en) * | 2014-06-16 | 2014-11-05 | 邯郸美的制冷设备有限公司 | A kind of for suppressing electromagnetic interference filter circuit and the air conditioner of resonance peak |
| CN104104216A (en) * | 2014-07-23 | 2014-10-15 | 孟加顷 | Switch power source filtering circuit |
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| Date | Code | Title | Description |
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| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20161102 |
|
| RJ01 | Rejection of invention patent application after publication |