CN102843161A - Method and system for modulating driving signals based on spread spectrum technology - Google Patents
Method and system for modulating driving signals based on spread spectrum technology Download PDFInfo
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- CN102843161A CN102843161A CN201210283543XA CN201210283543A CN102843161A CN 102843161 A CN102843161 A CN 102843161A CN 201210283543X A CN201210283543X A CN 201210283543XA CN 201210283543 A CN201210283543 A CN 201210283543A CN 102843161 A CN102843161 A CN 102843161A
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Abstract
The invention discloses a method and a system for modulating driving signals based on a spread spectrum technology. The method for modulating the driving signals comprises a step S1, a step S2, a step S3 and a step S4, wherein in the step S1, a raw of driving signals and a raw of spread spectrum sequence are input to a spread spectrum operation unit as input signals; in the step S2, the spread spectrum operation unit carries out spread spectrum operation to the driving signals and the spread spectrum sequence in a predetermined range based on reference signals; in the step S3, the state of output is determined according to an operation result obtained in the step S2; and in the step S4, the step S1, the step S2 and the Step S3 are cycled to obtain the required spread spectrum driving signals. By means of the method and the system for modulating the driving signals based on the spread spectrum technology, the problem that in the prior art, inhibition of electro-magnetic interference (EMI) of various devices or modules cannot meet design requirements is solved, efficiency of certain modules is improved to a certain extent, and the method and the system for modulating the driving signals based on the spread spectrum technology have the advantages of being simple, efficient, controllable in modulation degree and good in randomness in the range of requirements.
Description
Technical field
The invention belongs to the EMI technical field, relate to a kind of drive signal modulator approach, relate in particular to a kind of drive signal modulator approach based on spread spectrum; Simultaneously, the invention still further relates to a kind of drive signal modulating system based on spread spectrum.
Background technology
Development along with electronic industry; Requirement to various electronic products is also increasingly high; Such as Switching Power Supply is just little with volume, loss is little, the efficient advantages of higher; Obtained fast development in field of power supplies, its range of application also more and more widely, switch power technology has become the mainstream technology in the field of power supplies.
But in equipment such as communication, instrument and meter, the electromagnetic interference (EMI) that various radio-frequency pulses and harmonic wave thereof and parasitic oscillation bring makes that some performance or the index in these systems has decline in various degree.How to reduce these signals to other equipment in the system and extraneous electromagnetic interference, be inevitable problem in the design always.Usually, according to the difference of propagation path, electromagnetic interference can be divided into conducted interference and radiated interference two big classes, and conducted interference is propagated along input, the output line of power supply; And radiated interference belongs to radio frequency interference, is main with space radiation.
To the different characteristics of conducted interference and radiated interference, the traditional method that suppresses EMI is respectively to adopt filtering and shield technology.As long as reasonable in design, effect is all apparent in view.But, but be difficult to meet design requirement in some occasion.Spread spectrum is a kind of new technology that is applied in the wireless communication field originally, and it is extended to one to RF energy than in the wider frequency through frequency modulation(FM), is made up of fundamental frequency signal and its odd harmonic such as square-wave signal.And main electromagnetic radiation energy comes from fundamental frequency signal, 3 times and 5 order harmonic components.Can be in certain frequency range through spread spectrum with the Energy distribution of fundamental frequency signal, simultaneously also with the Energy distribution of its each harmonic to a wider frequency range.Because through the frequency range of ovennodulation nth harmonic be fundamental frequency scope after ovennodulation n doubly.
Summary of the invention
Technical problem to be solved by this invention is: a kind of drive signal modulator approach based on spread spectrum is provided; Can solve present various device or module and suppress the problem that EMI is difficult to meet design requirement; And improved the efficient of certain module to a certain extent, have simple, efficient; Modulation degree is controlled, in the good characteristics of claimed range randomness.
In addition; The present invention also provides a kind of drive signal modulating system based on spread spectrum, can solve present various device or module and suppress the problem that EMI is difficult to meet design requirement, and improve the efficient of certain module to a certain extent; Have simple; Efficiently, modulation degree is controlled, in the good characteristics of claimed range randomness.
For solving the problems of the technologies described above, the present invention adopts following technical scheme:
A kind of drive signal modulator approach based on spread spectrum, said method comprises the steps:
Step S1, a row drive signal and a row frequency expansion sequence are inputed to a spread spectrum arithmetic element as input signal;
Step S2, said spread spectrum arithmetic element are as the criterion with a reference signal, and drive signal and frequency expansion sequence are carried out the spread spectrum computing in prescribed limit;
Step S3, decide the state of output according to the operation result of step S2;
Step S1, step S2, step S3 are carried out in step S4, circulation, obtain required spread spectrum drive signal.
As a kind of preferred version of the present invention, said step S1 also comprises:
Utilize a driving signal generating unit to generate modulated drive signal;
The frequency expansion sequence that utilizes a frequency expansion sequence generation unit generation to need.
As a kind of preferred version of the present invention, among the said step S2, the spread spectrum code sequence that the utilization of said spread spectrum arithmetic element has high code check adopts various modulation systems to come spread-spectrum; The handling process of spread spectrum computing comprises: the pseudo noise code of information source and setting is carried out mould two add; With pseudo-random code sequence signal is carried out the multifrequency frequency shift keying; The time-shift keying of the sheet of signal being selected with certain sign indicating number sequence for a long time.
As a kind of preferred version of the present invention, among the said step S2, select the modulation range of modulated drive signal arbitrarily.
As a kind of preferred version of the present invention, the reference signal among the said step S2 is produced by inside or is provided by the outside.
As a kind of preferred version of the present invention, among the said step S3, decide its output height state by the normal distribution result who exports; Perhaps operation result is used hash algorithm or inferior power operation, decide its output height state by hash algorithm or inferior power operation result; Perhaps directly the compute mode of determining step S2 is " 1 " or " 0 ", exports its height state.
A kind of drive signal modulating system based on spread spectrum, said system comprises:
Driving signal generating unit is in order to generate modulated drive signal;
The frequency expansion sequence generation unit is in order to generate frequency expansion sequence;
Signal input unit, the frequency expansion sequence that drive signal that is used for said driving signal generating unit is generated and frequency expansion sequence generation unit generate inputs to a spread spectrum arithmetic element as input signal;
The spread spectrum arithmetic element is used for being as the criterion with a reference signal, and drive signal and frequency expansion sequence are carried out the spread spectrum computing in prescribed limit;
The state output unit decides the state of output in order to the operation result according to said spread spectrum arithmetic element.
As a kind of preferred version of the present invention, said system also comprises: the modulation range selected cell, and in order to the modulation range of the modulated drive signal of any selection.
As a kind of preferred version of the present invention, said reference signal is produced by inside or is provided by the outside.
As a kind of preferred version of the present invention, said system utilizes programmable logic device, in programmable logic device, accomplishes, and perhaps utilizes separation module to accomplish.
Beneficial effect of the present invention is: drive signal modulator approach and system based on spread spectrum that the present invention proposes; Drive signal and frequency expansion sequence are sent into arithmetic unit carry out computing; This arithmetic unit then is for the band spectrum modulation of accomplishing this drive signal and this frequency expansion sequence specially designs, and uses this method just can carry out band spectrum modulation as benchmark to the specific part of drive signal with this frequency expansion sequence.The invention solves present various device or module and suppress the problem that EMI is difficult to meet design requirement, and improved the efficient of certain module to a certain extent, have simply, efficient, modulation degree is controlled, in the good characteristics of claimed range randomness.
Description of drawings
Fig. 1 is the action principle figure that the present invention is based on the drive signal modulating system of spread spectrum.
Fig. 2 is the composition sketch map that the present invention is based on the drive signal modulating system of spread spectrum.
Fig. 3 is the Organization Chart of drive signal modulating system of the present invention in programmable logic device.
Embodiment
Specify the preferred embodiments of the present invention below in conjunction with accompanying drawing.
Embodiment one
See also Fig. 1, Fig. 2; The present invention has disclosed a kind of drive signal modulating system based on spread spectrum, and said system comprises: driving signal generating unit 11, frequency expansion sequence generation unit 12, signal input unit 13, modulation range selected cell 14, spread spectrum arithmetic element 15, state output unit 16, signal processing unit 17.
Driving signal generating unit 11 is in order to generate modulated drive signal.
Frequency expansion sequence generation unit 12 is in order to generate frequency expansion sequence.
The frequency expansion sequence that drive signal that signal input unit 13 is used for driving signal generating unit 11 is generated and frequency expansion sequence generation unit 12 generate inputs to spread spectrum arithmetic element 15 as input signal.
Modulation range selected cell 14 is in order to select the modulation range of modulated drive signal arbitrarily as required.
Spread spectrum arithmetic element 15 is used for being as the criterion with a reference signal, and drive signal and frequency expansion sequence are carried out the spread spectrum computing in prescribed limit.Particularly, in the present embodiment, said spread spectrum arithmetic element 15 utilizes the spread spectrum code sequence with high code check to adopt various modulation systems to come spread-spectrum.The handling process of spread spectrum computing comprises: the pseudo noise code of information source and setting is carried out mould two add; With pseudo-random code sequence signal is carried out the multifrequency frequency shift keying; The time-shift keying of the sheet of signal being selected with certain sign indicating number sequence for a long time etc.In addition, be not too large in prescribed limit in order to confirm the band spectrum modulation rate, be no more than 20% such as the modulation rate of regulation frequency expansion sequence and drive signal.Said reference signal is produced by inside or is provided by the outside.
System of the present invention can utilize programmable logic device, in programmable logic device, accomplish, and also can utilize separation module to accomplish.As shown in Figure 3, in the present embodiment, system of the present invention utilizes programmable logic device to accomplish.
More than introduced the composition of the drive signal modulating system that the present invention is based on spread spectrum, the present invention has also disclosed a kind of drive signal modulator approach based on spread spectrum when disclosing said system, and said method comprises the steps:
[step S1] inputs to a spread spectrum arithmetic element with a row drive signal and a row frequency expansion sequence as input signal.Particularly, utilize driving signal generating unit to generate modulated drive signal; The frequency expansion sequence that utilizes the generation of frequency expansion sequence generation unit to need.
[step S2] said spread spectrum arithmetic element is as the criterion (said reference signal is produced by inside or provided by the outside) with a reference signal, and drive signal and frequency expansion sequence are carried out the spread spectrum computing in prescribed limit.Modulated drive signal can be selected modulation range arbitrarily, and carries out band spectrum modulation.Be not too large in prescribed limit, be no more than 20% such as the modulation rate of regulation frequency expansion sequence and drive signal in order to confirm the band spectrum modulation rate.
[step S3] decides the state of output according to the operation result of step S2.Owing to judge not to be changeless here, only illustrate here: such as, or the state of after computing, judging is 10, is output as high level for a long time when 1 to 0 so, 1 to 0 output low level after a little while, and 1 exports high-impedance state when identical with 0.
Step S1, step S2, step S3 are carried out in [step S4] circulation; Obtain the drive signal of spread spectrum at random; Be used to drive follow up device (like switching tube) after this drive signal handled, or directly be used for follow up device, thereby reach technique effect of the present invention.Drive signal behind the spread spectrum here be without the drive signal of spread spectrum through the random sequence modulation and come, the drive signal that is equivalent to behind the spread spectrum has just been done some change on original drive signal.
In sum; Drive signal modulator approach and system that the present invention proposes based on spread spectrum; Drive signal and frequency expansion sequence are sent into arithmetic unit carry out computing; This arithmetic unit then is for the band spectrum modulation of accomplishing this drive signal and this frequency expansion sequence specially designs, and uses this method just can carry out band spectrum modulation as benchmark to the specific part of drive signal with this frequency expansion sequence.The invention solves present various device or module and suppress the problem that EMI is difficult to meet design requirement, and improved the efficient of certain module to a certain extent, have simply, efficient, modulation degree is controlled, in the good characteristics of claimed range randomness.
Here description of the invention and application is illustrative, is not to want with scope restriction of the present invention in the above-described embodiments.Here the distortion of the embodiment that is disclosed and change are possible, and the replacement of embodiment is known with the various parts of equivalence for those those of ordinary skill in the art.Those skilled in the art are noted that under the situation that does not break away from spirit of the present invention or substantive characteristics, and the present invention can be with other form, structure, layout, ratio, and realize with other assembly, material and parts.Under the situation that does not break away from the scope of the invention and spirit, can carry out other distortion and change here to the embodiment that is disclosed.
Claims (10)
1. the drive signal modulator approach based on spread spectrum is characterized in that said method comprises the steps:
Step S1, a row drive signal and a row frequency expansion sequence are inputed to a spread spectrum arithmetic element as input signal;
Step S2, said spread spectrum arithmetic element are as the criterion with a reference signal, and drive signal and frequency expansion sequence are carried out the spread spectrum computing in prescribed limit;
Step S3, decide the state of output according to the operation result of step S2;
Step S1, step S2, step S3 are carried out in step S4, circulation, obtain required spread spectrum drive signal.
2. the drive signal modulator approach based on spread spectrum according to claim 1 is characterized in that:
Said step S1 also comprises:
Utilize a driving signal generating unit to generate modulated drive signal;
The frequency expansion sequence that utilizes a frequency expansion sequence generation unit generation to need.
3. the drive signal modulator approach based on spread spectrum according to claim 1 is characterized in that:
Among the said step S2, the spread spectrum code sequence that the utilization of said spread spectrum arithmetic element has high code check adopts various modulation systems to come spread-spectrum; The handling process of spread spectrum computing comprises: the pseudo noise code of information source and setting is carried out mould two add; With pseudo-random code sequence signal is carried out the multifrequency frequency shift keying; The time-shift keying of the sheet of signal being selected with certain sign indicating number sequence for a long time.
4. the drive signal modulator approach based on spread spectrum according to claim 1 is characterized in that:
Among the said step S2, select the modulation range of modulated drive signal arbitrarily.
5. the drive signal modulator approach based on spread spectrum according to claim 1 is characterized in that:
Reference signal among the said step S2 is produced by inside or is provided by the outside.
6. the drive signal modulator approach based on spread spectrum according to claim 1 is characterized in that:
Among the said step S3, decide its output height state by the normal distribution result who exports; Perhaps operation result is used hash algorithm or inferior power operation, decide its output height state by hash algorithm or inferior power operation result; Perhaps directly the compute mode of determining step S2 is " 1 " or " 0 ", exports its height state.
7. drive signal modulating system based on spread spectrum is characterized in that said system comprises:
Driving signal generating unit is in order to generate modulated drive signal;
The frequency expansion sequence generation unit is in order to generate frequency expansion sequence;
Signal input unit, the frequency expansion sequence that drive signal that is used for said driving signal generating unit is generated and frequency expansion sequence generation unit generate inputs to a spread spectrum arithmetic element as input signal;
The spread spectrum arithmetic element is used for being as the criterion with a reference signal, and drive signal and frequency expansion sequence are carried out the spread spectrum computing in prescribed limit;
The state output unit decides the state of output in order to the operation result according to said spread spectrum arithmetic element.
8. the drive signal modulating system based on spread spectrum according to claim 7 is characterized in that:
Said system also comprises: the modulation range selected cell, and in order to the modulation range of the modulated drive signal of any selection.
9. the drive signal modulating system based on spread spectrum according to claim 7 is characterized in that:
Said reference signal is produced by inside or is provided by the outside.
10. the drive signal modulating system based on spread spectrum according to claim 7 is characterized in that:
Said system utilizes programmable logic device, in programmable logic device, accomplishes, and perhaps utilizes separation module to accomplish.
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Citations (4)
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| CN201528323U (en) * | 2009-05-03 | 2010-07-14 | 南京微盟电子有限公司 | EMI improvement circuit based on spread spectrum conversion technology |
| CN101917807A (en) * | 2010-08-12 | 2010-12-15 | 美凌微电子(上海)有限公司 | Driving system for light-emitting diode |
| CN102226941A (en) * | 2010-09-30 | 2011-10-26 | 四川虹欧显示器件有限公司 | Control method and apparatus for electronic magnetic interference |
| WO2011131201A1 (en) * | 2010-04-23 | 2011-10-27 | Pr Electronics A/S | A power supply and method of operation |
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- 2012-08-09 CN CN201210283543XA patent/CN102843161A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201528323U (en) * | 2009-05-03 | 2010-07-14 | 南京微盟电子有限公司 | EMI improvement circuit based on spread spectrum conversion technology |
| WO2011131201A1 (en) * | 2010-04-23 | 2011-10-27 | Pr Electronics A/S | A power supply and method of operation |
| CN101917807A (en) * | 2010-08-12 | 2010-12-15 | 美凌微电子(上海)有限公司 | Driving system for light-emitting diode |
| CN102226941A (en) * | 2010-09-30 | 2011-10-26 | 四川虹欧显示器件有限公司 | Control method and apparatus for electronic magnetic interference |
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Application publication date: 20121226 |