CN104113203B - A kind of method for quick position switch power supply EMI noise - Google Patents
A kind of method for quick position switch power supply EMI noise Download PDFInfo
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- CN104113203B CN104113203B CN201410341850.8A CN201410341850A CN104113203B CN 104113203 B CN104113203 B CN 104113203B CN 201410341850 A CN201410341850 A CN 201410341850A CN 104113203 B CN104113203 B CN 104113203B
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Abstract
The present invention discloses a kind of method for quick position switch power supply EMI noise, and the method step is as follows: first according to standard EMI testing method, switch power supply is carried out conduction test, then the frequency of the limit value that is above standard is carried out EMI noise location; Set up differential mode noise filter network with differential mode capacitor, differential mode choke coil, set up common mode noise filter network with common mode capacitance, common mode choke; Difference mould filter network is connected in parallel on filtering load plate with common-mode filter network, controls the validity of difference mould, common-mode filter network with switch, and filtering load plate is series at switch power supply input terminus, verifies that overproof noise frequency range is common mode interference or DM EMI. Compared to the prior art the present invention, has the features such as reasonable in design, easy to operate, effectively ensure that the electronics normal operation of surrounding, enables the transmission of communication system transmission data complete and accurate; And reduce the generation that the abnormal conditions such as shutdown and warning occurs in system.
Description
Technical field
The present invention relates to power supply noise management technique field, specifically a kind of method for quick position switch power supply EMI noise.
Background technology
EMI(ElectromagneticInterference) translator of Chinese: electromagnetic interference. The interference phenomenon produced after referring to hertzian wave and electronic component effect, has conducted interference and radiation interference two kinds. Conducted interference refers to by conducting medium the signal coupling (interference) on an electric network to another electric network. Radiation interference refer to interfering source by space its signal coupling (interference) to another electric network, in High-Speed PCB and system design, the pin of high-frequency signal line, unicircuit, all kinds of connectors etc. all may become the radiation interference source with antenna performance, can launch hertzian wave and affect the normal operation of other subsystems in other systems or native system.
Switch power supply, compared with linear stabilized power supply, has many advantages such as power consumption is little, efficiency height, volume are little, weight is light, voltage stabilized range width, and oneself is widely used in computer and the field such as peripherals, communication, automatically control, household electrical appliance thereof. But due to switch power supply operating frequency height; inside produces very fast electric current, voltage change; i.e. dv/dt and di/dt; cause switch power module will to produce stronger harmonic interference and the interference of point peak; and the normal operation of self circuit and other electronic system is affected by coupling paths such as conduction, radiation and crosstalks; the electronic functionalities of surrounding can be caused time serious disorderly, make communication system transmission data mistake, abnormal shutdown and warning etc. occur, irremediable consequence will be caused.
Summary of the invention
The technical assignment of the present invention is to provide a kind of method for quick position switch power supply EMI noise.
The technical assignment of the present invention realizes in the following manner, and the method step is as follows:
First according to standard EMI testing method, switch power supply is carried out conduction test, then the frequency of the limit value that is above standard is carried out EMI noise location; Set up differential mode noise filter network with differential mode capacitor, differential mode choke coil, set up common mode noise filter network with common mode capacitance, common mode choke; Difference mould filter network is connected in parallel on filtering load plate with common-mode filter network, controls the validity of difference mould, common-mode filter network with switch, and filtering load plate is series at switch power supply input terminus, verifies that overproof noise frequency range is common mode interference or DM EMI.
Described switch-linear hybrid has K1, K2, K3, K4, K5, K6, K7, K8; The break-make of K switch 1, K2, K3, K4 control DM EMI filter network; The break-make of K switch 5, K6, K7, K8 control common mode interference filter network.
Switching operation method is as follows:
First closing K1, K2, K3, K4, disconnect K5, K6, K7, K8, this time difference mould filter network is effective, and common-mode filter network lost efficacy, and then upper electrical switch power source loads adds to fully loaded, and the frequency that exceeds standard is tested in checking before this; If it is under this pattern, the frequency inhibition that exceeds standard is obvious, it is possible to judge that this frequency is as differential mode noise; If inhibition is not obvious or does not have effect at all, closed K5, K6, K7, K8, ensure switch power supply continuation work, disconnects K1, K2, K3, K4, if under this pattern, the frequency inhibition that exceeds standard is obvious, it is possible to would judge that this frequency is as common mode noise.
Described common mode choke is made up of low frequency common mode choke and high frequency common mode reactance coil, and its medium and low frequency common mode choke adopts manganese zinc magnetic core, and high frequency common mode reactance coil adopts nickel zinc magnetic core.
A kind of method for quick position switch power supply EMI noise of the present invention is compared to the prior art, there is the features such as reasonable in design, easy to operate, effectively ensure that the electronics normal operation of surrounding, enable the transmission of communication system transmission data complete and accurate; And reduce the generation that the abnormal conditions such as shutdown and warning occurs in system.
Accompanying drawing explanation
Accompanying drawing 1 is a kind of principle of work schematic diagram for quick position switch power supply EMI noise.
Embodiment
Embodiment 1:
The method step is as follows:
First according to standard EMI testing method, switch power supply is carried out conduction test, then the frequency of the limit value that is above standard is carried out EMI noise location; Set up differential mode noise filter network with differential mode capacitor, differential mode choke coil, set up common mode noise filter network with common mode capacitance, common mode choke; Difference mould filter network is connected in parallel on filtering load plate with common-mode filter network, controls the validity of difference mould, common-mode filter network with switch, and filtering load plate is series at switch power supply input terminus, verifies that overproof noise frequency range is common mode interference or DM EMI.
Embodiment 2:
The method step is specific as follows:
K switch 1, K2, K3, K4, K5, K6, K7, K8 are set; The break-make of K switch 1, K2, K3, K4 control DM EMI filter network; The break-make of K switch 5, K6, K7, K8 control common mode interference filter network. First closing K1, K2, K3, K4, disconnect K5, K6, K7, K8, this time difference mould filter network is effective, and common-mode filter network lost efficacy, and then upper electrical switch power source loads adds to fully loaded, and the frequency that exceeds standard is tested in checking before this; If it is under this pattern, the frequency inhibition that exceeds standard is obvious, it is possible to judge that this frequency is as differential mode noise;If inhibition is not obvious or does not have effect at all, closed K5, K6, K7, K8, ensure switch power supply continuation work, disconnects K1, K2, K3, K4, if under this pattern, the frequency inhibition that exceeds standard is obvious, it is possible to would judge that this frequency is as common mode noise.
Embodiment 3:
The method step is specific as follows:
K switch 1, K2, K3, K4, K5, K6, K7, K8 are set; The break-make of K switch 1, K2, K3, K4 control DM EMI filter network; The break-make of K switch 5, K6, K7, K8 control common mode interference filter network. Common mode choke is made up of low frequency common mode choke and high frequency common mode reactance coil, and its medium and low frequency common mode choke adopts manganese zinc magnetic core, and high frequency common mode reactance coil adopts nickel zinc magnetic core. First closing K1, K2, K3, K4, disconnect K5, K6, K7, K8, this time difference mould filter network is effective, and common-mode filter network lost efficacy, and then upper electrical switch power source loads adds to fully loaded, and the frequency that exceeds standard is tested in checking before this; If it is under this pattern, the frequency inhibition that exceeds standard is obvious, it is possible to judge that this frequency is as differential mode noise; If inhibition is not obvious or does not have effect at all, closed K5, K6, K7, K8, ensure switch power supply continuation work, disconnects K1, K2, K3, K4, if under this pattern, the frequency inhibition that exceeds standard is obvious, it is possible to would judge that this frequency is as common mode noise.
By embodiment above, described those skilled in the art can be easy to realize the present invention. It should be appreciated that the present invention is not limited to above-mentioned several embodiments. On the basis of disclosed enforcement mode, described those skilled in the art can the different technology feature of arbitrary combination, thus realize different technical schemes.
Claims (3)
1. the method for quick position switch power supply EMI noise, it is characterised in that, the method step is as follows:
First according to standard EMI testing method, switch power supply is carried out conduction test, then the frequency of the limit value that is above standard is carried out EMI noise location; Set up differential mode noise filter network with differential mode capacitor, differential mode choke coil, set up common mode noise filter network with common mode capacitance, common mode choke; Difference mould filter network is connected in parallel on filtering load plate with common-mode filter network, controls the validity of difference mould, common-mode filter network with switch, and filtering load plate is series at switch power supply input terminus, verifies that overproof noise frequency range is common mode interference or DM EMI;
Switching operation method is as follows:
First closing K1, K2, K3, K4, disconnect K5, K6, K7, K8, this time difference mould filter network is effective, and common-mode filter network lost efficacy, and then upper electrical switch power source loads adds to fully loaded, and the frequency that exceeds standard is tested in checking before this; If it is under this pattern, the frequency inhibition that exceeds standard is obvious, it is possible to judge that this frequency is as differential mode noise; If inhibition is not obvious or does not have effect at all, closed K5, K6, K7, K8, ensure switch power supply continuation work, disconnects K1, K2, K3, K4, if under this pattern, the frequency inhibition that exceeds standard is obvious, it is possible to would judge that this frequency is as common mode noise.
2. a kind of method for quick position switch power supply EMI noise according to claim 1, it is characterised in that, described switch-linear hybrid has K1, K2, K3, K4, K5, K6, K7, K8; The break-make of K switch 1, K2, K3, K4 control DM EMI filter network; The break-make of K switch 5, K6, K7, K8 control common mode interference filter network.
3. a kind of method for quick position switch power supply EMI noise according to claim 1, it is characterized in that, described common mode choke is made up of low frequency common mode choke and high frequency common mode reactance coil, its medium and low frequency common mode choke adopts manganese zinc magnetic core, and high frequency common mode reactance coil adopts nickel zinc magnetic core.
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| CN201410341850.8A CN104113203B (en) | 2014-07-17 | 2014-07-17 | A kind of method for quick position switch power supply EMI noise |
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| CN201410341850.8A CN104113203B (en) | 2014-07-17 | 2014-07-17 | A kind of method for quick position switch power supply EMI noise |
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| CN104113203B true CN104113203B (en) | 2016-06-08 |
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| CN106569070B (en) * | 2016-11-07 | 2019-07-12 | 深圳Tcl数字技术有限公司 | The EMI localization method and device of television set |
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| CN104113203A (en) | 2014-10-22 |
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