CN102226941A - Control method and apparatus for electronic magnetic interference - Google Patents
Control method and apparatus for electronic magnetic interference Download PDFInfo
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- CN102226941A CN102226941A CN2011101243312A CN201110124331A CN102226941A CN 102226941 A CN102226941 A CN 102226941A CN 2011101243312 A CN2011101243312 A CN 2011101243312A CN 201110124331 A CN201110124331 A CN 201110124331A CN 102226941 A CN102226941 A CN 102226941A
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Abstract
The invention provides a control method and a control apparatus for electronic magnetic interference (EMI). The control method for electronic magnetic interference comprises the following steps: adding at least one spread spectrum chip to a clock output terminal of an active crystal oscillator; and extending working efficiency of a clock circuit of the active crystal oscillator by utilizing the at least one spread spectrum chip. According to the invention, the EMI can be reduced from an interference source.
Description
Technical field
The present invention relates to plasma display technique field, in particular to a kind of control method and device of electromagnetic interference (EMI).
Background technology
PDP (Plasma Display Panel, colour plasma display) is a kind of display device that developed rapidly in recent years.Colour plasma display becomes the first-selection of large screen display device with superior performance, the large-sized solor plasma display device has begun to come into the market at present, especially AC type AC-PDP has advantages such as type of drive is simple and obtains extensive studies and application, and can progressively be popularized in recent years.Along with the arrival in Digital Television epoch, the signal frequency of the control panel on the plasma display is more and more higher, has increased EMI (Electronic Magnetic Interference, the electromagnetic interference (EMI)) problem of plasma display.
The three elements that form electromagnetic interference (EMI) are interference source, route of transmission and disturbed equipment.Thereby, suppress electromagnetic interference (EMI) and also should set about from this three aspect.At first should suppress interference source, directly eliminate cause of failures; Next is coupling and the radiation of eliminating between interference source and the disturbed equipment, the route of transmission that cuts off electromagnetic interference (EMI); The 3rd is the interference rejection ability that improves disturbed equipment, lowers its susceptibility to noise.Several measures that suppress to disturb at present all are that method commonly used is shielding, ground connection and filtering with the coupling channel that cuts off between electromagnetic interference source and the disturbed equipment basically.Their effective really ways, still, few people relate to direct control interference source, eliminate and disturb, or improve the antijamming capability of disturbed equipment, and this just causes interference source to produce interference to other equipment always, eliminates and disturbs the resource that needs waste a large amount of.
The control panel of plasma display has become a high-speed digital circuit plate, if design badly, will produce serious electromagnetic interference problem, causes system's cisco unity malfunction, and product can not be tested by EMI.So the EMC of control panel (Electronic Magnetic Compatibility, Electro Magnetic Compatibility) design becomes particularly important, and the active clock circuit of the periodic duty on the control panel is exactly an interference source, and its design quality becomes the success or failure key of control panel EMI design.In addition, the parasitic parameter of components and parts, the principle diagram design of clock circuit lacks perfection, PCB (Printed Circuit Board, printed-wiring board (PWB)) cabling adopts manual layout usually, has very big randomness, and the near-field interference of PCB is big, and device mounting, placement on the printed panel, and the unreasonable EMI that can cause in orientation disturbs.
At correlation technique in the interference source mentioned continue problem that other equipment are disturbed, effective solution is not proposed at present as yet.
Summary of the invention
The present invention aims to provide a kind of control method and device of electromagnetic interference (EMI), to solve the lasting problem that other equipment are disturbed of interference source.
According to an aspect of the present invention, provide a kind of control method of electromagnetic interference (EMI), having comprised: the output terminal of clock at active crystal oscillator increases at least one exhibition chip frequently; Utilize described at least one exhibition frequency chip that the frequency of operation of the clock circuit of described active crystal oscillator is expanded.
Preferably, the model of described exhibition frequency chip comprises: P2040A, P2042A.
Preferably, the clock circuit of described active crystal oscillator also comprises following peripheral components: resistance and electric capacity.
Preferably, after utilizing described at least one exhibition frequently chip being expanded the frequency of operation of the clock circuit of described active crystal oscillator, also comprise: the clock circuit of determining active crystal oscillator is an interference source; Cut off the coupling channel between described interference source and the disturbed equipment.
Preferably, cut off the coupling channel between described interference source and the disturbed equipment, comprise following a kind of mode of operation: shielding, ground connection and filtering.
Preferably, described method is applied to the plasma display control panel.
According to another aspect of the present invention, provide a kind of control device of electromagnetic interference (EMI), having comprised: increased module, be used for increasing at least one exhibition chip frequently at the output terminal of clock of active crystal oscillator; Expansion module is used to utilize described at least one exhibition frequency chip that the frequency of operation of the clock circuit of described active crystal oscillator is expanded.
Preferably, described device also comprises: determination module is used for determining that the clock circuit of active crystal oscillator is an interference source; Cut off module, be used to cut off the coupling channel between described interference source and the disturbed equipment.
Preferably, described cut-out module also is used to adopt following a kind of method of operating to cut off coupling channel between described interference source and the disturbed equipment: shielding, ground connection and filtering.
Preferably, described device is integrated in the plasma display control panel.
In embodiments of the present invention, increase at least one exhibition chip frequently at the output terminal of clock of active crystal oscillator, utilize at least one exhibition frequently chip the frequency of operation of the clock circuit of active crystal oscillator is expanded.The embodiment of the invention is from disturbing source control electromagnetic radiation, the frequency of operation (being the clock signal energy) of clock circuit is expanded to the frequency range wideer than original frequency of operation, thereby reduce the electromagnetic interference (EMI) on the specific clock frequency point, reach the purpose that electromagnetic interference (EMI) resists.
Description of drawings
Accompanying drawing described herein is used to provide further understanding of the present invention, constitutes the application's a part, and illustrative examples of the present invention and explanation thereof are used to explain the present invention, do not constitute improper qualification of the present invention.In the accompanying drawings:
Fig. 1 is the processing flow chart according to the control of the electromagnetic interference (EMI) of the embodiment of the invention;
Fig. 2 is according to the pin definitions of the P2040A of the embodiment of the invention and inner structure synoptic diagram;
Fig. 3 is according to the pin definitions of the P2042A of the embodiment of the invention and inner structure synoptic diagram;
Fig. 4 is the structural representation according to the clock circuit of the embodiment of the invention;
Fig. 5 is first kind of structural representation according to the control device of the electromagnetic interference (EMI) of the embodiment of the invention;
Fig. 6 is second kind of structural representation according to the control device of the electromagnetic interference (EMI) of the embodiment of the invention.
Embodiment
Below with reference to the accompanying drawings and in conjunction with the embodiments, describe the present invention in detail.
Hereinafter will describe the present invention with reference to the accompanying drawings and in conjunction with the embodiments in detail.Need to prove that under the situation of not conflicting, embodiment and the feature among the embodiment among the application can make up mutually.
Several measures of mentioning present inhibition interference in the correlation technique all are that method commonly used is shielding, ground connection and filtering with the coupling channel that cuts off between electromagnetic interference source and the disturbed equipment basically.Their effective really ways, still, few people relate to direct control interference source, eliminate and disturb, or improve the antijamming capability of disturbed equipment, and this just causes interference source to produce interference to other equipment always, eliminates and disturbs the resource that needs waste a large amount of.
The control panel of plasma display has become a high-speed digital circuit plate, if design badly, will produce serious electromagnetic interference problem, causes system's cisco unity malfunction, and product can not be tested by EMI.So the EMC of control panel (Electronic Magnetic Compatibility, Electro Magnetic Compatibility) design becomes particularly important, and the active clock circuit of the periodic duty on the control panel is exactly an interference source, and its design quality becomes the success or failure key of control panel EMI design.In addition, the parasitic parameter of components and parts, the principle diagram design of clock circuit lacks perfection, printed-wiring board (PWB) (PCB) cabling adopts manual layout usually, has very big randomness, the near-field interference of PCB is big, and device mounting, placement on the printed panel, and the unreasonable EMI that can cause in orientation disturbs.
For solving the problems of the technologies described above, the embodiment of the invention provides a kind of control method of electromagnetic interference (EMI), and its treatment scheme comprises as shown in Figure 1:
Step S102, increase at least one exhibition chip frequently at the output terminal of clock of active crystal oscillator;
Step S104, utilize at least one exhibition frequently chip the frequency of operation of the clock circuit of active crystal oscillator is expanded.
In embodiments of the present invention, increase at least one exhibition chip frequently at the output terminal of clock of active crystal oscillator, utilize at least one exhibition frequently chip the frequency of operation of the clock circuit of active crystal oscillator is expanded.The embodiment of the invention is from disturbing source control electromagnetic radiation, the frequency of operation (being the clock signal energy) of clock circuit is expanded to the frequency range wideer than original frequency of operation, thereby reduce the electromagnetic interference (EMI) on the specific clock frequency point, reach the purpose that electromagnetic interference (EMI) resists.
In fact, the control method of the electromagnetic interference (EMI) that the embodiment of the invention adopts is a kind of controlled modulation to clock signal, and this method can obviously not increase the shake of clock signal.Application proof spread spectrum technique in the reality is effectively, and different degree of modulation can reduce electromagnetic interference (EMI) 7 to 10dB and not wait.But adopting said method needs the chip of specific function, can increase cost.
In embodiments of the present invention, chip can be more than one type frequently in exhibition, and preferred model can comprise: P2040A, P2042A.Wherein, the pin definitions of P2040A and inner structure comprise as shown in Figure 2:
Pin one CLKIN;
Pin two MRA;
Pin 3SR1;
Pin 4VSS;
Pin 5SSON#;
Pin 6ModOUT;
Pin 7SR0;
Pin 8VDD.
The pin definitions of P2042A and inner structure are as shown in Figure 3, comprise: pins such as CLKIN, SR0, SR1, MAR, SSON#, VDD, VSS, ModOUT also comprise inter-process modules such as PLL, Modulation, Frequency Divider, Feedback Divider, Phase Delector, Loop Filter, VCO, Output Divider.
During enforcement, except that comprising exhibition frequently the chip, the clock circuit of active crystal oscillator also comprises peripheral components such as resistance that some are essential and electric capacity, and the power supply of clock circuit is produced by power circuit.The embodiment of the invention is an example with the exhibition frequency chip of P2040A model, and a kind of typical clock circuit is provided, and its synoptic diagram sees also as Fig. 4.
In embodiments of the present invention, remove interference source and carry out outside the spread processing, can also reduce in conjunction with other processing modes and disturb, for example, when the clock circuit of determining active crystal oscillator is interference source, cut off the coupling channel between interference source and the disturbed equipment.Cut off the coupling channel between interference source and the disturbed equipment, can adopt following a kind of mode of operation: shielding, ground connection and filtering.Different electromagnetic interference (EMI) control modes is used in combination, can plays better control action electromagnetic interference (EMI).
The control method of the kind electromagnetic interference (EMI) that the embodiment of the invention provides can be applied to the plasma display control panel, also can be applied to other similar equipment of electromagnetic interference (EMI) principle and plasma display control panel.By a kind of like this circuit structure, the frequency of the clock signal of active crystal oscillator is changed in a scope, thereby the electromagnetic interference (EMI) on a certain fixed frequency point, has been got to the purpose that electromagnetic interference (EMI) suppresses because of reducing in frequency jitter.Circuit simple in structure, Chip Packaging is little frequently in exhibition, and it is little to take the PCB area, and flexible design has very high practicality.
Based on same inventive concept, the embodiment of the invention also provides a kind of control device of electromagnetic interference (EMI), and its structural representation comprises as shown in Figure 5:
Increase module 501, be used for increasing at least one exhibition chip frequently at the output terminal of clock of active crystal oscillator;
Expansion module 502 is connected with increase module 501, is used to utilize at least one exhibition frequency chip that the frequency of operation of the clock circuit of active crystal oscillator is expanded.
In one embodiment, as shown in Figure 6, the control device of electromagnetic interference (EMI) can also comprise:
Cut off module 602, be connected, be used to cut off the coupling channel between interference source and the disturbed equipment with determination module 601.
During enforcement, the control device of the control device of electromagnetic interference (EMI) shown in Figure 5 and electromagnetic interference (EMI) shown in Figure 6 is two devices arranged side by side, can be used in combination, and also can use separately.When the method that provides when the embodiment of the invention was applied to the plasma display control panel, the control device of the control device of electromagnetic interference (EMI) shown in Figure 5 and electromagnetic interference (EMI) shown in Figure 6 was integrated in the plasma display control panel.
In one embodiment, cut off module 602 and can also be used to adopt following a kind of method of operating cut-out interference source and the coupling channel between the disturbed equipment: shielding, ground connection and filtering.
As can be seen from the above description, the present invention has realized following technique effect:
In embodiments of the present invention, increase at least one exhibition chip frequently at the output terminal of clock of active crystal oscillator, utilize at least one exhibition frequently chip the frequency of operation of the clock circuit of active crystal oscillator is expanded.The embodiment of the invention is from disturbing source control electromagnetic radiation, the frequency of operation (being the clock signal energy) of clock circuit is expanded to the frequency range wideer than original frequency of operation, thereby reduce the electromagnetic interference (EMI) on the specific clock frequency point, reach the purpose that electromagnetic interference (EMI) resists.
Obviously, those skilled in the art should be understood that, above-mentioned each module of the present invention or each step can realize with the general calculation device, they can concentrate on the single calculation element, perhaps be distributed on the network that a plurality of calculation element forms, alternatively, they can be realized with the executable program code of calculation element, carry out by calculation element thereby they can be stored in the memory storage, perhaps they are made into each integrated circuit modules respectively, perhaps a plurality of modules in them or step are made into the single integrated circuit module and realize.Like this, the present invention is not restricted to any specific hardware and software combination.
The above is the preferred embodiments of the present invention only, is not limited to the present invention, and for a person skilled in the art, the present invention can have various changes and variation.Within the spirit and principles in the present invention all, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. the control method of an electromagnetic interference (EMI) is characterized in that, comprising:
Output terminal of clock at active crystal oscillator increases at least one exhibition chip frequently;
Utilize described at least one exhibition frequency chip that the frequency of operation of the clock circuit of described active crystal oscillator is expanded.
2. method according to claim 1 is characterized in that, the described exhibition model of chip frequently comprises: P2040A, P2042A.
3. method according to claim 1 is characterized in that, the clock circuit of described active crystal oscillator also comprises following peripheral components: resistance and electric capacity.
4. method according to claim 1 is characterized in that, after utilizing described at least one exhibition frequently chip being expanded the frequency of operation of the clock circuit of described active crystal oscillator, also comprises:
The clock circuit of determining active crystal oscillator is an interference source;
Cut off the coupling channel between described interference source and the disturbed equipment.
5. method according to claim 4 is characterized in that, cuts off the coupling channel between described interference source and the disturbed equipment, comprises following a kind of mode of operation: shielding, ground connection and filtering.
6. according to each described method of claim 1 to 5, it is characterized in that described method is applied to the plasma display control panel.
7. the control device of an electromagnetic interference (EMI) is characterized in that, comprising:
Increase module, be used for increasing at least one exhibition chip frequently at the output terminal of clock of active crystal oscillator;
Expansion module is used to utilize described at least one exhibition frequency chip that the frequency of operation of the clock circuit of described active crystal oscillator is expanded.
8. device according to claim 7 is characterized in that, described device also comprises:
Determination module is used for determining that the clock circuit of active crystal oscillator is an interference source;
Cut off module, be used to cut off the coupling channel between described interference source and the disturbed equipment.
9. device according to claim 8 is characterized in that, described cut-out module also is used to adopt following a kind of method of operating to cut off coupling channel between described interference source and the disturbed equipment: shielding, ground connection and filtering.
10. according to each described device of claim 7 to 9, it is characterized in that described device is integrated in the plasma display control panel.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2011101243312A CN102226941A (en) | 2010-09-30 | 2011-05-13 | Control method and apparatus for electronic magnetic interference |
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| CN201010507254.4 | 2010-09-30 | ||
| CN201010507254 | 2010-09-30 | ||
| CN2011101243312A CN102226941A (en) | 2010-09-30 | 2011-05-13 | Control method and apparatus for electronic magnetic interference |
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Cited By (6)
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| CN102843161A (en) * | 2012-08-09 | 2012-12-26 | 江苏中江物联网科技有限公司 | Method and system for modulating driving signals based on spread spectrum technology |
| CN104573222A (en) * | 2015-01-05 | 2015-04-29 | 浪潮电子信息产业股份有限公司 | Active crystal oscillator wire arrangement method for reducing EMI risk |
| CN106921761A (en) * | 2015-12-25 | 2017-07-04 | 小米科技有限责任公司 | Display module and electronic equipment |
| CN107741531A (en) * | 2017-09-07 | 2018-02-27 | 郑州云海信息技术有限公司 | The Low emissivity processing system and method for testing of a kind of server admin network interface |
| WO2018113254A1 (en) * | 2016-12-22 | 2018-06-28 | 惠科股份有限公司 | Spread-spectrum decoding method for transmitted signal and display apparatus |
| CN109617622A (en) * | 2018-12-28 | 2019-04-12 | 杭州迪普科技股份有限公司 | Reduce method, apparatus, equipment and the storage medium of frame type equipment electromagnetic interference |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102843161A (en) * | 2012-08-09 | 2012-12-26 | 江苏中江物联网科技有限公司 | Method and system for modulating driving signals based on spread spectrum technology |
| CN104573222A (en) * | 2015-01-05 | 2015-04-29 | 浪潮电子信息产业股份有限公司 | Active crystal oscillator wire arrangement method for reducing EMI risk |
| CN106921761A (en) * | 2015-12-25 | 2017-07-04 | 小米科技有限责任公司 | Display module and electronic equipment |
| CN106921761B (en) * | 2015-12-25 | 2020-03-03 | 小米科技有限责任公司 | Display module and electronic device |
| WO2018113254A1 (en) * | 2016-12-22 | 2018-06-28 | 惠科股份有限公司 | Spread-spectrum decoding method for transmitted signal and display apparatus |
| CN107741531A (en) * | 2017-09-07 | 2018-02-27 | 郑州云海信息技术有限公司 | The Low emissivity processing system and method for testing of a kind of server admin network interface |
| CN107741531B (en) * | 2017-09-07 | 2020-04-03 | 郑州云海信息技术有限公司 | Low-radiation processing system and testing method for server management network port |
| CN109617622A (en) * | 2018-12-28 | 2019-04-12 | 杭州迪普科技股份有限公司 | Reduce method, apparatus, equipment and the storage medium of frame type equipment electromagnetic interference |
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Application publication date: 20111026 |