CN107994766B - Period based on ladder wave train spreads PWM control method and device - Google Patents
Period based on ladder wave train spreads PWM control method and device Download PDFInfo
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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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Abstract
The invention discloses a kind of, and the period based on ladder wave train spreads PWM control method and device, wherein method includes: to generate step signal according to ladder wave function；Step signal is sampled, the ladder wave train in staircase waveform distribution is obtained；It is fluctuated to obtain forcing frequency value according to ladder wave train and maximum frequency；The carrier signal of frequency variation is obtained according to reference switches frequency and forcing frequency value；Compare generation spread spectrum pwm control signal according to carrier signal and modulation wave signal.This method being capable of more efficiently inhibition converters electromagnetic interference, in inhibitory effect, it can not only reduction switching frequency by a larger margin and its multiple subharmonic amplitude, more importantly only nearby a small range has the increase of harmonic amplitude for several times in switching frequency and its again, spectral frequencies spreading range is narrow, the generation of low-frequency noise and subharmonic noise is avoided, the Electro Magnetic Compatibility of converters can be further increased.
Description
Technical field
The present invention relates to power electronics field, in particular to a kind of period based on ladder wave train spreads PWM
(Pulse Width Modulation, pulsewidth modulation) control method and device.
Background technique
With the fast development of power electronic technique, converters are had been widely used in production and living.But
It is the EMI (Electromagnetic due to caused by switching device high frequency mo in converters
Interference, electromagnetic interference) problem has been similarly obtained extensive concern.Spread spectrum PWM technology is a kind of electric based on electric power is changed
The PWM technology for being used to inhibit converters EMI that sub- converter switches frequency proposes, it can change the frequency spectrum of EMI
Distribution, can be effectively reduced converters switching frequency and its EMI peak value located for several times again.
In the related technology, PWM will be spread to be applied in the EMI for inhibiting various types converters, passes through the period
It spreads PWM, spread the spread spectrum PWM control of the methods of PWM, chaos spread spectrum PWM realization converters at random, and analyze expansion
Frequency PWM inhibits the mechanism of EMI, inhibits the effect of EMI using analytic method, emulation and experimental verification spread spectrum PWM.Traditional period expands
Frequency PWM, by selecting modulation parameter, can limit sideband using periodic functions such as triangular wave, sine wave, square waves as modulated signal
Range, but EMI peak value rejection ability is not strong；Random spread spectrum PWM and chaos spread spectrum PWM is respectively with random signal and chaotic signal
As modulated signal, although there is good effect to EMI peak value, there is broadband in random signal and chaotic signal frequency domain
Sideband is continuously expanded in entire frequency range, generates a large amount of subharmonic and low-frequency harmonics by white noise character, is caused secondary humorous
Wave noise and low-frequency noise are unfavorable for the inhibition of converters EMI.
Summary of the invention
The present invention is directed to solve at least some of the technical problems in related technologies.
For this purpose, an object of the present invention is to provide a kind of, the period based on ladder wave train spreads PWM control method,
This method can more efficiently inhibition converters electromagnetic interference can not only be by a larger margin in inhibitory effect
Reduction switching frequency and its multiple subharmonic amplitude, it is often more important that only in switching frequency and its again neighbouring a small range for several times
There is the increase of harmonic amplitude, spectral frequencies spreading range is narrow, avoids the generation of low-frequency noise and subharmonic noise, can be into one
Step improves the Electro Magnetic Compatibility of converters.
It is another object of the present invention to propose that a kind of period based on ladder wave train spreads PWM control device.
In order to achieve the above objectives, one aspect of the present invention embodiment proposes a kind of period spread spectrum based on ladder wave train
PWM control method, comprising the following steps: step signal is generated according to ladder wave function；The step signal is adopted
Sample obtains the ladder wave train in staircase waveform distribution；It fluctuates to obtain forcing frequency according to the ladder wave train and maximum frequency
Value；The carrier signal of frequency variation is obtained according to the reference switches frequency and the forcing frequency value；Believed according to the carrier wave
Number and modulation wave signal compare generation spread spectrum pwm control signal.
The period based on ladder wave train of the embodiment of the present invention spreads PWM control method, can be by believing staircase waveform
It number is sampled to obtain ladder wave train, to be fluctuated to obtain forcing frequency value, and root according to ladder wave train and maximum frequency
The carrier signal of frequency variation is obtained according to reference switches frequency and forcing frequency value, to compare carrier signal and modulation wave signal
Generate spread spectrum pwm control signal, can more efficiently inhibition converters electromagnetic interference, in inhibitory effect, no
It only being capable of reduction switching frequency by a larger margin and its multiple subharmonic amplitude, it is often more important that only in switching frequency and its multiple
Secondary a small range nearby has the increase of harmonic amplitude, and spectral frequencies spreading range is narrow, avoids low-frequency noise and subharmonic noise
Generation, the Electro Magnetic Compatibility of converters can be further increased.
In addition, the period spread spectrum PWM control method according to the above embodiment of the present invention based on ladder wave train can be with
With following additional technical characteristic:
Further, in one embodiment of the invention, the mathematic(al) representation of the step signal are as follows:
Wherein, A1, A2, N is the parameter of ladder wave function.
Further, in one embodiment of the invention, according to the following formula to the parameter of the ladder wave function into
Row limitation, so that the value range of ladder wave train is (- 1,1), formula are as follows:
Wherein, fmFor the frequency of step signal.
Further, in one embodiment of the invention, the frequency of the carrier signal is indicated with following formula, value
Change within a preset range.
fc=fr+xi·Δf,xi∈ (- 1,1), i=1,2 ...,
Wherein, fcFor the frequency of chaotic carrier signal, frFor benchmark carrier frequency, Δ f is maximum frequency undulating value, xiFor
The ladder wave train.
Further, in one embodiment of the invention, the ladder is obtained according to the parameter of converters
Electromagnetic interference inhibitory effect of the parameter A1, A2 of wave function to be optimal.
In order to achieve the above objectives, another aspect of the present invention embodiment proposes a kind of period spread spectrum based on ladder wave train
PWM control device, comprising: the first generation module, for generating step signal according to ladder wave function；Acquisition module is used for
The step signal is sampled, the ladder wave train in staircase waveform distribution is obtained；First obtains module, for according to institute
It states ladder wave train and maximum frequency fluctuates to obtain forcing frequency value；Second obtains module, for according to the reference switches frequency
Rate and the forcing frequency value obtain the carrier signal of frequency variation；Second generation module, for according to the carrier signal and
Modulation wave signal compares generation spread spectrum pwm control signal.
The period based on ladder wave train of the embodiment of the present invention spreads PWM control device, can be by believing staircase waveform
It number is sampled to obtain ladder wave train, to be fluctuated to obtain forcing frequency value, and root according to ladder wave train and maximum frequency
The carrier signal of frequency variation is obtained according to reference switches frequency and forcing frequency value, to compare carrier signal and modulation wave signal
Generate spread spectrum pwm control signal, can more efficiently inhibition converters electromagnetic interference, in inhibitory effect, no
It only being capable of reduction switching frequency by a larger margin and its multiple subharmonic amplitude, it is often more important that only in switching frequency and its multiple
Secondary a small range nearby has the increase of harmonic amplitude, and spectral frequencies spreading range is narrow, avoids low-frequency noise and subharmonic noise
Generation, the Electro Magnetic Compatibility of converters can be further increased.
In addition, the period spread spectrum PWM control device according to the above embodiment of the present invention based on ladder wave train can be with
With following additional technical characteristic:
Further, in one embodiment of the invention, the mathematic(al) representation of the step signal are as follows:
Wherein, A1, A2, N is the parameter of ladder wave function.
Further, in one embodiment of the invention, first generation module is also used to through following formula pair
The parameter of the step signal is limited, so that the value range of ladder wave train is (- 1,1), formula are as follows:
Wherein, fmFor the frequency of step signal.
Further, in one embodiment of the invention, the frequency of the carrier signal is indicated with following formula, value
Change within a preset range.
fc=fr+xi·Δf,xi∈ (- 1,1), i=1,2 ...,
Wherein, fcFor the frequency of chaotic carrier signal, frFor benchmark carrier frequency, Δ f is maximum frequency undulating value, xiFor
The ladder wave train.
Further, in one embodiment of the invention, the ladder is obtained according to the parameter of converters
Electromagnetic interference inhibitory effect of the parameter A1, A2 of wave function to be optimal.
The additional aspect of the present invention and advantage will be set forth in part in the description, and will partially become from the following description
Obviously, or practice through the invention is recognized.
Detailed description of the invention
Above-mentioned and/or additional aspect and advantage of the invention will become from the following description of the accompanying drawings of embodiments
Obviously and it is readily appreciated that, in which:
Fig. 1 is the flow chart that PWM control method is spread according to the period based on ladder wave train of the embodiment of the present invention；
Fig. 2 is the step signal schematic diagram according to one embodiment of the invention；
Fig. 3 is the Staircase wave signal schematic representation according to one embodiment of the invention；
Fig. 4 is to spread PWM control method according to the period based on ladder wave train of one specific embodiment of the present invention
Flow chart；
Fig. 5 is according to the Boost topological diagram of one embodiment of the invention and its schematic diagram of EMI interference path；
Fig. 6 is according to Boost V under the different control modes of one embodiment of the inventiondsSpectrum diagram；
Fig. 7 is according to Boost V under the different control modes of another embodiment of the present inventiondsSpectrum diagram；
Fig. 8 is according to Boost V under the different control modes of further embodiment of the present inventiondsSpectrum diagram；
Fig. 9 is the structural representation that PWM control device is spread according to the period based on ladder wave train of the embodiment of the present invention
Figure.
Specific embodiment
The embodiment of the present invention is described below in detail, examples of the embodiments are shown in the accompanying drawings, wherein from beginning to end
Same or similar label indicates same or similar element or element with the same or similar functions.Below with reference to attached
The embodiment of figure description is exemplary, it is intended to is used to explain the present invention, and is not considered as limiting the invention.
Before introducing the period spread spectrum PWM control method and device based on ladder wave train of the embodiment of the present invention, first
Simply to introduce lower conventional spread spectrum PWM implementation method.
Spread spectrum PWM control for converters, switching frequency is no longer a constant, but in certain model
Enclose interior variation, switching frequency fsIt can be expressed by formula (1).
fc=fr+xi·Δf,xi∈ (- 1,1), i=1,2 ... (1)
Wherein, frFor benchmark switching frequency, Δ f is switching frequency fluctuation range, xiFor modulated signal sequences, by base
One forcing frequency value of superposition on the basis of quasi- switching frequency, to realize that switching frequency changes in a certain range.In spread spectrum PWM
In control, modulated signal generallys use periodic signal (sine wave signal, triangular signal, square-wave signal etc.), random signal, mixes
Ignorant signal (logistic mapping, tent mapping, chebyshev mapping etc.).
According to converters PWM control principle, modulation wave signal generates switching device compared with carrier signal
Signal is controlled, in spread spectrum PWM control, generates PWM control letter compared with the carrier signal that frequency changes using modulation wave signal
Number, control converters work realizes spread spectrum PWM control with this.
The period spread spectrum PWM control based on ladder wave train proposed according to embodiments of the present invention is described with reference to the accompanying drawings
Method and device is described the kind proposed according to embodiments of the present invention with reference to the accompanying drawings first and is spread based on the period of ladder wave train
PWM control method.
Fig. 1 is the flow chart of the period spread spectrum PWM control method based on ladder wave train of the embodiment of the present invention.
As shown in Figure 1, should based on ladder wave train period spread PWM control method the following steps are included:
In step s101, step signal is generated according to ladder wave function.
Wherein, in one embodiment of the invention, the mathematic(al) representation of step signal are as follows:
Wherein, A1, A2, N is the parameter of ladder wave function.
It is understood that N can determine the ladder number of f (x), the staircase waveform of generation in above-mentioned parameters of formula
Quantity is 2N+2, N=1,2,3 ..., A1And A2Determine the height and width of each staircase waveform；Coordinate original is located at for median
The step signal of point, shown in general mathematical expression such as formula (2).
In formula, N, M=1,2,3 ..., N determine ladder number when f (x) is positive value, and M determines rank when f (x) is negative value
Terraced number, A1And A2Determine the height and width of each staircase waveform.
Optionally, according to the value range of xi in formula (1): xi∈ (- 1,1) should then take N=M, therefore formula (2) can change
It is written as:
Ladder number in whole step signal is determined by N in formula (3).If taking N=3, the step signal generated is such as
Shown in Fig. 2.
Further, in one embodiment of the invention, the parameter of ladder wave function is limited according to the following formula
System, so that the value range of ladder wave train is (- 1,1), formula are as follows:
Wherein, fmFor the frequency of step signal.
It is understood that needing if signal shown in Fig. 2 is used in converters spread spectrum PWM control to rank
The parameter of terraced wave function is done as defined below:
Wherein, fmIt is defined as the frequency of step signal, i.e., the frequency of modulated signal in staircase waveform spread spectrum PWM control.Then
In actually control, the waveform of Staircase wave signal is as shown in Figure 3.
In step s 102, step signal is sampled, obtains the ladder wave train in staircase waveform distribution.
In step s 103, it is fluctuated to obtain forcing frequency value according to ladder wave train and maximum frequency.
In step S104, the carrier signal of frequency variation is obtained according to reference switches frequency and forcing frequency value.
In step s105, generation spread spectrum pwm control signal is compared according to carrier signal and modulation wave signal.
Further, in one embodiment of the invention, the frequency of carrier signal indicates that value is pre- with following formula
If variation in range.
fc=fr+xi·Δf,xi∈ (- 1,1), i=1,2 ...,
Wherein, fcFor the frequency of chaotic carrier signal, frFor benchmark carrier frequency, Δ f is maximum frequency undulating value, xiFor
The ladder wave train.
Further, in one embodiment of the invention, staircase waveform letter is obtained according to the parameter of converters
Electromagnetic interference inhibitory effect of several parameter A1, A2 to be optimal.
It is understood that the parameter A of ladder wave function1, A2, the selection of N value is to spread spectrum PWM control inhibition power electronics
Converter influential effect is very big, needs Selecting All Parameters A reasonable to applied converters1, A2, N value is to reach most
Excellent electromagnetic interference inhibitory effect.
Specifically, PWM is spread for staircase waveform, the x in formula (1)iIt can be generated by step signal.Wherein, staircase waveform
PWM realization principle flow chart is spread as shown in figure 4, the method for the embodiment of the present invention generates staircase waveform according to staircase waveform formula first
Signal；Secondly step signal is sampled, to obtain the sequential value in staircase waveform distribution, thus the x in substituted (1)i；
The carrier signal changed in a certain range using formula (1) generation frequency again generates spread spectrum PWM control letter compared with modulating wave
Number, and then the on-off of converters switching device is controlled, to realize the staircase waveform spread spectrum PWM control of converters
System.
For example, PWM control is spread for the effect of inhibition converters EMI, originally to analyze staircase waveform
Staircase waveform spread spectrum PWM is applied in the control of Boost by inventive embodiments by taking common Boost as an example,
The topological diagram of Boost is as shown in Figure 5.
For Boost, the main component of EMI is Conducted EMI, and Conducted EMI can be divided into according to its interference path
Common mode EMI and differential mode EMI, interference path are as shown in Figure 5.According to the mechanism of production of common mode EMI and differential mode EMI, switching device Q
Gate source voltage VdsFor the major electromagnetic interference source of Boost.Switching device open in turn off process, VdsFor arteries and veins
Dynamic voltage forms interference electric current by Boost inductance, voltage source, route and parasitic parameter, and then generates common mode
EMI and differential mode EMI, common mode EMI and differential mode EMI are finally codetermined by interference source and interference path impedance.Due to spread spectrum PWM control
It is to improve the spectrum distribution of electromagnetic interference source that system, which inhibits the mechanism of converters EMI, Boost transformation shown in Fig. 5
In device, spread spectrum PWM control can change EMI source voltage VdsSpectrum distribution, so the method for the embodiment of the present invention below only
For voltage VdsFrequency spectrum analyzed.
The method of the embodiment of the present invention has built the Boost under spread spectrum PWM control using Matlab/Simulink and has emulated electricity
Road, table 1 are Boost system emulation parameter list.
Table 1
| Parameter | Numerical value |
| Input voltage | 20V |
| Power | 120W |
| Output voltage | 50V |
| Reference switches frequency Fr | 20kHz |
| Maximum frequency disturbs △ f | 1kHz |
The Staircase wave signal of different ladder quantity, different frequency can be generated, while according to formula (3) in order to illustrate rank
Terraced wave spread spectrum PWM control is for inhibiting EMI validity, and the method for the embodiment of the present invention is respectively by staircase waveform spread spectrum PWM and tradition
Determine frequency PWM, triangular wave spread spectrum PWM, chaos spread spectrum PWM are compared, in addition, also to different ladder quantity when, staircase waveform spread spectrum
Influence of the PWM for Boost frequency spectrum is analyzed.
That introduce first is staircase waveform spread spectrum PWM and traditional comparison determined between frequency PWM, triangular wave spread spectrum PWM.
Be arranged formula (3) in N=14, so as to generate ladder quantity be 30 staircase waveform as Staircase wave signal
Applied in the control of Boost.Triangular wave spreads PWM and uses triangular signal, it should be noted that triangular signal
It is identical with the frequency of step signal.
Using emulation to the Boost V determined under frequency PWM, triangular wave spread spectrum PWM, staircase waveform spread spectrum PWM controldsInto
Row measurement.Boost V under three kinds of control modesdsShown in spectrogram such as Fig. 6 (a), 0~50kHz enlarged drawing such as
Shown in Fig. 6 (b).
As shown in fig. 6, triangular wave spread spectrum PWM and staircase waveform spread spectrum PWM and the Boost phase determined under frequency PWM is controlled
Switching frequency and its again harmonic spike for several times can be reduced than, triangular wave spread spectrum PWM and staircase waveform spread spectrum PWM, and the two
It is also essentially identical to spread width, but under staircase waveform spread spectrum PWM control, switching frequency and its multiple subharmonic amplitude are lower,
At 20kHz, determine frequency PWM to control lower amplitude to be 144.5dB μ V, amplitude is 130dB μ V under triangular wave spread spectrum PWM control, fixed
It is 127dB μ V that frequency PWM, which controls lower amplitude, illustrates that staircase waveform spread spectrum PWM is improving VdsThe effect of frequency spectrum is more preferable.
That secondly introduce is staircase waveform spread spectrum PWM and traditional comparison determined between frequency PWM, chaos spread spectrum PWM.
N=14 in same setting formula (3), to generate the staircase waveform that ladder quantity is 30 as Staircase wave signal
Applied in the control of Boost.Chaos spread spectrum PWM control uses Logistic chaotic maps, expression formula such as formula (5)
It is shown:
ξi=μ ξi-1(1-ξi-1),ξi∈ (0,1), i=1,2 ... (5)
When parameter μ=4, primary condition ξ=0.6, Logistic chaotic maps will be in chaos state, this mapping is answered
For formula (1), chaos spread spectrum PWM control is realized.
Using emulation to the Boost V determined under frequency PWM, chaos spread spectrum PWM, staircase waveform spread spectrum PWM controldsIt carries out
Measurement.Boost V under three kinds of control modesdsShown in spectrogram such as Fig. 7 (a), wherein in the enlarged drawing of 0~50kHz
As shown in Fig. 7 (b).
As shown in fig. 7, chaos spread spectrum PWM can also reduce switch frequency compared with determining the Boost under frequency PWM control
Rate and its again harmonic spike for several times, but under chaos spread spectrum PWM control, reducing switching frequency and its multiple subharmonic peak
While value, can in switching frequency and its again for several times around generate on a large scale, the subharmonic of amplitude, as shown in Fig. 7 (b), rank
Terraced wave spread spectrum PWM only nearby has the increase of harmonic amplitude in small frequency range for several times in switching frequency and its again, and in 20kHz
Place, it is 136dB μ V that chaos spread spectrum PWM, which controls lower amplitude, and it is 9dB μ V high to control lower amplitude than staircase waveform spread spectrum PWM.To sum up divide
Analysis, compares chaos spread spectrum PWM, and staircase waveform spreads PWM and inhibits EMI effect more preferable.
The comparison of staircase waveform spread spectrum PWM control when what is finally introduced is ladder quantity difference.
N=14 and N=19 in formula (3) is respectively set, to generate the rank that ladder quantity is 30 and ladder quantity is 40
Terraced wave is applied in the control of Boost as Staircase wave signal, and then compares ladder quantity for frequency spectrum
The influence of distribution.
Shown in simulation result such as Fig. 8 (a), shown in enlarged drawing such as Fig. 8 (b) of 0~50kHz, as we can see from the figure
It is more preferable for the inhibitory effect of switching frequency and its multiple subharmonic peak value when ladder quantity increases, at 20kHz, N=19
When staircase waveform spread spectrum PWM to control lower amplitude be 124dB μ V, than reducing 3dB μ V when N=14.
The period spread spectrum PWM control method based on ladder wave train proposed according to embodiments of the present invention, can be by right
Step signal is sampled to obtain ladder wave train, to fluctuate to obtain forcing frequency according to ladder wave train and maximum frequency
Value, and the carrier signal of frequency variation is obtained according to reference switches frequency and forcing frequency value, to carrier signal and modulating wave
Signal compares generation spread spectrum pwm control signal, more efficiently inhibition converters electromagnetic interference, in inhibitory effect
On, can not only reduction switching frequency by a larger margin and its multiple subharmonic amplitude, it is often more important that only in switching frequency and
Nearby a small range has the increase of harmonic amplitude for several times again for it, and spectral frequencies spreading range is narrow, avoids low-frequency noise and secondary humorous
The generation of wave noise can further increase the Electro Magnetic Compatibility of converters.
The period spread spectrum PWM control based on ladder wave train proposed according to embodiments of the present invention referring next to attached drawing description
Device.
Fig. 9 is the structural schematic diagram of the period spread spectrum PWM control device based on ladder wave train of the embodiment of the present invention.
As shown in figure 9, should include: the first generation module based on the period spread spectrum PWM control device 10 of ladder wave train
100, acquisition module 200, first obtains module 300, second and obtains module 400 and the second generation module 500.
Wherein, the first generation module 100 is used to generate step signal according to ladder wave function.Acquisition module 200 is used for
Step signal is sampled, the ladder wave train in staircase waveform distribution is obtained.First, which obtains module 300, is used for according to ladder
Wave train and maximum frequency fluctuate to obtain forcing frequency value.Second, which obtains module 400, is used for according to reference switches frequency and disturbance
Frequency values obtain the carrier signal of frequency variation.Second generation module 500 according to carrier signal and modulation wave signal for comparing
Generate spread spectrum pwm control signal.The device 10 of the embodiment of the present invention can compare generation according to carrier signal and modulation wave signal
Pwm control signal is spread, more efficiently inhibition converters electromagnetic interference can not only be more in inhibitory effect
Significantly reduce switching frequency and its multiple subharmonic amplitude, it is often more important that only small nearby for several times in switching frequency and its again
There is the increase of harmonic amplitude in range, spectral frequencies spreading range is narrow, avoids the generation of low-frequency noise and subharmonic noise, energy
Enough further increase the Electro Magnetic Compatibility of converters.
Further, in one embodiment of the invention, the mathematic(al) representation of step signal are as follows:
Wherein, A1, A2, N is the parameter of ladder wave function.
Further, in one embodiment of the invention, the first generation module 100 is also used to through following formula to rank
The parameter of terraced wave function is limited, so that the value range of ladder wave train is (- 1,1), formula are as follows:
Wherein, fmFor the frequency of step signal.
Further, in one embodiment of the invention, the frequency of carrier signal indicates that value is pre- with following formula
If variation in range.
fc=fr+xi·Δf,xi∈ (- 1,1), i=1,2 ...,
Wherein, fcFor the frequency of chaotic carrier signal, frFor benchmark carrier frequency, Δ f is maximum frequency undulating value, xiFor
The ladder wave train.
Further, in one embodiment of the invention, staircase waveform letter is obtained according to the parameter of converters
Electromagnetic interference inhibitory effect of several parameter A1, A2 to be optimal.
It should be noted that aforementioned explaining to the period spread spectrum PWM control method embodiment based on ladder wave train
The bright period spread spectrum PWM control device based on ladder wave train for being also applied for the embodiment, details are not described herein again.
The period spread spectrum PWM control device based on ladder wave train proposed according to embodiments of the present invention, can be by right
Step signal is sampled to obtain ladder wave train, to fluctuate to obtain forcing frequency according to ladder wave train and maximum frequency
Value, and the carrier signal of frequency variation is obtained according to reference switches frequency and forcing frequency value, to carrier signal and modulating wave
Signal compares generation spread spectrum pwm control signal, more efficiently inhibition converters electromagnetic interference, in inhibitory effect
On, can not only reduction switching frequency by a larger margin and its multiple subharmonic amplitude, it is often more important that only in switching frequency and
Nearby a small range has the increase of harmonic amplitude for several times again for it, and spectral frequencies spreading range is narrow, avoids low-frequency noise and secondary humorous
The generation of wave noise can further increase the Electro Magnetic Compatibility of converters.
In the description of the present invention, it is to be understood that, term " center ", " longitudinal direction ", " transverse direction ", " length ", " width ",
" thickness ", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom" "inner", "outside", " up time
The orientation or positional relationship of the instructions such as needle ", " counterclockwise ", " axial direction ", " radial direction ", " circumferential direction " be orientation based on the figure or
Positional relationship is merely for convenience of description of the present invention and simplification of the description, rather than the device or element of indication or suggestion meaning must
There must be specific orientation, be constructed and operated in a specific orientation, therefore be not considered as limiting the invention.
In addition, term " first ", " second " are used for descriptive purposes only and cannot be understood as indicating or suggesting relative importance
Or implicitly indicate the quantity of indicated technical characteristic.Define " first " as a result, the feature of " second " can be expressed or
Implicitly include at least one this feature.In the description of the present invention, the meaning of " plurality " is at least two, such as two, three
It is a etc., unless otherwise specifically defined.
In the present invention unless specifically defined or limited otherwise, term " installation ", " connected ", " connection ", " fixation " etc.
Term shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or integral；It can be mechanical connect
It connects, is also possible to be electrically connected；It can be directly connected, can also can be in two elements indirectly connected through an intermediary
The interaction relationship of the connection in portion or two elements, unless otherwise restricted clearly.For those of ordinary skill in the art
For, the specific meanings of the above terms in the present invention can be understood according to specific conditions.
In the present invention unless specifically defined or limited otherwise, fisrt feature in the second feature " on " or " down " can be with
It is that the first and second features directly contact or the first and second features pass through intermediary mediate contact.Moreover, fisrt feature exists
Second feature " on ", " top " and " above " but fisrt feature be directly above or diagonally above the second feature, or be merely representative of
First feature horizontal height is higher than second feature.Fisrt feature can be under the second feature " below ", " below " and " below "
One feature is directly under or diagonally below the second feature, or is merely representative of first feature horizontal height less than second feature.
In the description of this specification, reference term " one embodiment ", " some embodiments ", " example ", " specifically show
The description of example " or " some examples " etc. means specific features, structure, material or spy described in conjunction with this embodiment or example
Point is included at least one embodiment or example of the invention.In the present specification, schematic expression of the above terms are not
It must be directed to identical embodiment or example.Moreover, particular features, structures, materials, or characteristics described can be in office
It can be combined in any suitable manner in one or more embodiment or examples.In addition, without conflicting with each other, the skill of this field
Art personnel can tie the feature of different embodiments or examples described in this specification and different embodiments or examples
It closes and combines.
Although the embodiments of the present invention has been shown and described above, it is to be understood that above-described embodiment is example
Property, it is not considered as limiting the invention, those skilled in the art within the scope of the invention can be to above-mentioned
Embodiment is changed, modifies, replacement and variant.
Claims (6)
1. a kind of period based on ladder wave train spreads PWM control method, which comprises the following steps:
Step signal is generated according to ladder wave function；
The step signal is sampled, the ladder wave train in staircase waveform distribution is obtained；
It fluctuates to obtain forcing frequency value according to the ladder wave train and maximum frequency；
The carrier signal of frequency variation is obtained according to reference switches frequency and the forcing frequency value；And
Compare generation spread spectrum pwm control signal according to the carrier signal and modulation wave signal；
Wherein, the mathematic(al) representation of the step signal are as follows:
Wherein, A1, A2, N is the parameter of ladder wave function；
The parameter of the ladder wave function is limited according to the following formula so that the value range of ladder wave train be (- 1,
1), formula are as follows:
(2N+1)A2=2
Wherein, fmFor the frequency of step signal.
2. the period according to claim 1 based on ladder wave train spreads PWM control method, which is characterized in that described
The frequency of carrier signal indicates that value changes within a preset range with following formula:
fc=fr+xi·Δf,xi∈ (- 1,1), i=1,2 ...,
Wherein, fcFor the frequency of chaotic carrier signal, frFor benchmark carrier frequency, Δ f is maximum frequency undulating value, xiIt is described
Ladder wave train.
3. the period according to claim 1 based on ladder wave train spreads PWM control method, which is characterized in that according to
The parameter of converters obtains the parameter A1, A2 of the ladder wave function and inhibits effect with the electromagnetic interference being optimal
Fruit.
4. a kind of period based on ladder wave train spreads PWM control device, characteristic is, comprising:
First generation module, for generating step signal according to ladder wave function；
Acquisition module obtains the ladder wave train in staircase waveform distribution for sampling to the step signal；
First obtains module, for fluctuating to obtain forcing frequency value according to the ladder wave train and maximum frequency；
Second obtains module, for obtaining the carrier signal of frequency variation according to reference switches frequency and the forcing frequency value；
And
Second generation module, for comparing generation spread spectrum pwm control signal according to the carrier signal and modulation wave signal；
Wherein, the mathematic(al) representation of the step signal are as follows:
Wherein, A1, A2, N is the parameter of ladder wave function；
First generation module is also used to limit by parameter of the following formula to the ladder wave function, formula are as follows:
(2N+1)A2=2
Wherein, fmFor the frequency of step signal.
5. the period according to claim 4 based on ladder wave train spreads PWM control device, which is characterized in that described
The frequency of carrier signal indicates that value changes within a preset range with following formula:
fc=fr+xi·Δf,xi∈ (- 1,1), i=1,2 ...,
Wherein, fcFor the frequency of chaotic carrier signal, frFor benchmark carrier frequency, Δ f is maximum frequency undulating value, xiIt is described
Ladder wave train.
6. the period according to claim 4 based on ladder wave train spreads PWM control device, which is characterized in that according to
The parameter of converters obtains the parameter A1, A2 of the ladder wave function and inhibits effect with the electromagnetic interference being optimal
Fruit.
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