CN108233924A - EMI based on phase-modulation reduces device and method - Google Patents
EMI based on phase-modulation reduces device and method Download PDFInfo
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03L—AUTOMATIC CONTROL, STARTING, SYNCHRONISATION OR STABILISATION OF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES
- H03L7/00—Automatic control of frequency or phase; Synchronisation
- H03L7/06—Automatic control of frequency or phase; Synchronisation using a reference signal applied to a frequency- or phase-locked loop
- H03L7/16—Indirect frequency synthesis, i.e. generating a desired one of a number of predetermined frequencies using a frequency- or phase-locked loop
- H03L7/18—Indirect frequency synthesis, i.e. generating a desired one of a number of predetermined frequencies using a frequency- or phase-locked loop using a frequency divider or counter in the loop
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03L—AUTOMATIC CONTROL, STARTING, SYNCHRONISATION OR STABILISATION OF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES
- H03L7/00—Automatic control of frequency or phase; Synchronisation
- H03L7/06—Automatic control of frequency or phase; Synchronisation using a reference signal applied to a frequency- or phase-locked loop
- H03L7/08—Details of the phase-locked loop
- H03L7/085—Details of the phase-locked loop concerning mainly the frequency- or phase-detection arrangement including the filtering or amplification of its output signal
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Abstract
The present invention relates to the EMI based on phase-modulation to reduce device and method, and described device includes：Phase offset generator, for variable phase pushing figure to be applied to each brew cycle of input signal；Phase-modulation read-only memory, for preserving the coefficient for determining the phase pushing figure applied in particular moment；And phase controller, for exporting with the modulated signal of phase pushing figure determined by the coefficient.By the present invention in that phase-modulation is carried out to clock signal so that the energy frequency spectrum of clock signal extends, so as to reduce EMI transmittings, wherein generating the spectral response of maximally-flat using minimum frequency shift (FS) with the delay or phase offset curve of optimization.Since the present invention is without using backfeed loop and with minimum component, so as to increase the overall reliability of system.
Description
Technical field
The present invention relates to technical field of electromagnetic compatibility, and in particular to the EMI (electromagnetic based on phase-modulation
Interference, electromagnetic interference) reduce device and method.
Background technology
Any of such as voltage or electric current establishes the main of electromagnetic interference (EMI) that OFF signal is many digital electronic devices by cable
Source.The EMI generated by these electronic devices must be suppressed to occur to interfere and meet FCC with other electronic devices
Regulation.The conventional method for reducing EMI includes the use of " passive " element, such as metallic shield, choke coil, ferrite bean, resistance
Device and capacitor etc..Recently trend has utilized " active " mode, wherein the peak energy for concentrating on narrowband is distributed on more
On wide frequency band.This technology is commonly referred to as spread-spectrum modulation.
The method of spread-spectrum is based primarily upon the frequency modulation(PFM) implemented using phaselocked loop.Other embodiment includes the use of slotting
Enter switching delay element in the signal path.Being limited in for these methods can not be physically real in the signal for causing problem
Now extremely small frequency shift (FS) and the EMI reduction benefits that substance is provided.
Fig. 1 shows that a kind of active EMI (spread-spectrum) based on phaselocked loop (PLL) reduces the block diagram of device.Such as Fig. 1 institutes
Show, the framework based on PLL, which uses, includes the multiple of counter, voltage or current control oscillator, phase comparator and wave filter
Element forms feedback loop network to implement.Catastrophic failure will be caused when any element in circuit breaks down.Also, come
Larger frequency shift (FS) can be caused from the shake of PLL.
Invention content
In view of problem above, the present invention is without using backfeed loop but by using the delay of optimization or phase offset curve
To carry out phase-modulation to clock signal so that the energy frequency spectrum of clock signal extends, so as to reduce EMI transmittings, wherein using most
Small frequency shift (FS) generates the spectral response of maximally-flat.Since the present invention is without using backfeed loop and with minimum group
Part, so as to increase the overall reliability of system.
According to an aspect of the present invention, it provides a kind of EMI based on phase-modulation and reduces device, including：
Phase offset generator, for variable phase pushing figure to be applied to each brew cycle of input signal；
Phase-modulation read-only memory, for be stored in particular moment apply phase pushing figure when identified coefficient；With
And
Phase controller, for exporting with the modulated signal of phase pushing figure determined by the coefficient.
The EMI based on phase-modulation reduces device, and the modulated signal has minimum down to +/- less than 0.05%
Phase offset and with more than 1 modulation ratio.
The EMI based on phase-modulation reduces device, and the phase offset generator includes：By multiple current limiteds
The delay line that type buffer is formed, wherein, the magnitude of current of each current limited type buffer is fed to by changing to change
State phase pushing figure.
The EMI based on phase-modulation reduces device, and the phase offset generator includes：
Variable load element is arranged in the path of the input signal, described for being changed by changing load
The slope of input signal；And
Buffer, for the sharp edge rate for restoring the signal of slope change and relative to first along delay is generated, to change
State phase pushing figure.
The EMI based on phase-modulation reduces device, and the variable load element includes：Capacitive element, resistance
Property element, inductive element or their arbitrary combination.
The EMI based on phase-modulation reduces device, and the phase offset generator includes：Individually prolonged by multiple
Slow element forms and with multiple grades of the tapped delay line individually accessed, wherein by arbitrary number of level control delay element come
Change the phase pushing figure.
The EMI based on phase-modulation reduces device, and the phase-modulation read-only memory includes：Look-up table, institute
It states look-up table and is provided with control word, for determining the coefficient of the phase pushing figure applied in particular moment.
The EMI based on phase-modulation reduces device, and the phase-modulation read-only memory includes：With each member
Part by read-only memory address choice row and column read-only memory framework.
The EMI based on phase-modulation reduces device, and the rate that the coefficient changes is changed by counter, institute
It states counter and address is supplied to the phase-modulation read-only memory, the modulation rate of the modulated signal is obtained by following formula：
Fm=Fin/ (D × N)
Wherein, Fm is modulation rate, and Fin is input frequency, and D is input divisor, and N is ROM counter maximum count values, and
And assume that ROM counters sequentially count down to N from 1.
The EMI based on phase-modulation reduces device, and the calculation of the modulation ratio is：Modulation ratio β=Δ f/
Fm, wherein, Δ f is the sum frequency deviation formed on input frequency Fin, and Fm is modulating frequency；The modulation ratio maximum value is
2。
According to another aspect of the present invention, a kind of EMI reduction methods based on phase-modulation are provided, including：
By phase offset generator, variable phase pushing figure is applied to each brew cycle of input signal；
By phase-modulation read-only memory, preserve to apply coefficient determined by phase pushing figure in particular moment；
And
By phase controller, output is with the modulated signal of phase pushing figure determined by the coefficient.
According to embodiment, the modulated signal with it is minimum down to +/- less than 0.05% phase offset and with big
In 1 modulation ratio.
The EMI reduction methods based on phase-modulation, wherein, the phase offset generator includes：By multiple electricity
Flow the delay line that constrained buffer is formed, wherein, by change be fed to the magnitude of current of each current limited type buffer come
Change the phase pushing figure.
The EMI reduction methods based on phase-modulation, wherein, the phase offset generator includes：
Variable load element is arranged in the path of the input signal, described for being changed by changing load
The slope of input signal；And
Buffer, for the sharp edge rate for restoring the signal of slope change and relative to first along delay is generated, to change
State phase pushing figure.
The EMI reduction methods based on phase-modulation, wherein, the variable load element includes：Capacitive element,
Resistance element, inductive element or their arbitrary combination.
The EMI reduction methods based on phase-modulation, wherein, the phase offset generator includes：By multiple lists
Only delay element forms and with multiple grades of the tapped delay line individually accessed, wherein being postponed by being controlled in arbitrary number of level
Element changes the phase pushing figure.
The EMI reduction methods based on phase-modulation, wherein, the phase-modulation read-only memory includes：It searches
Table, the look-up table are provided with control word, for determining the coefficient of the phase pushing figure applied in particular moment.
The EMI reduction methods based on phase-modulation, wherein, the phase-modulation read-only memory includes：Have
Each element by read-only memory address choice row and column read-only memory framework.
The EMI reduction methods based on phase-modulation, wherein, the rate that the coefficient changes is changed by counter
Become, address is supplied to the phase-modulation read-only memory by the counter, and the modulation rate of the modulated signal is by following formula
It obtains：
Fm=Fin/ (D × N)
Wherein, Fm is modulation rate, and Fin is input frequency, and D is input divisor, and N is ROM counter maximum count values, and
And assume that ROM counters sequentially count down to N from 1.
The EMI reduction methods based on phase-modulation, wherein, the calculation of the modulation ratio is：Modulation ratio β=
Δ f/Fm, wherein Δ f are the sum frequency deviation formed on input frequency Fin, and Fm is modulating frequency；The modulation ratio maximum value
It is 2.
Description of the drawings
Attached drawing is used to provide further understanding of the present invention, and a part for constitution instruction, the reality with the present invention
It applies example and is used together to explain the present invention, be not construed as limiting the invention.
Fig. 1 is that the active EMI based on phaselocked loop (PLL) of the prior art reduces the side of device (using spread-spectrum mode)
Block diagram.
Fig. 2 is the block diagram that the EMI according to embodiments of the present invention based on phase-modulation reduces device.
Fig. 3 is after showing that the EMI based on phase-modulation of the input signal by the embodiment of the present invention reduces device modulates
The schematic diagram of output signal.
Fig. 4 is the one of the phase offset generator that the EMI according to embodiments of the present invention based on phase-modulation reduces device
The block diagram of embodiment.
Fig. 5 is the another of the phase offset generator that the EMI according to embodiments of the present invention based on phase-modulation reduces device
The block diagram of one embodiment.
Fig. 6 is the phase-modulation read-only memory that the EMI according to embodiments of the present invention based on phase-modulation reduces device
Block diagram.
Fig. 7 is the spectrogram of unmodulated clock signal.
Fig. 8 is the frequency spectrum for the clock signal that the EMI according to embodiments of the present invention based on phase-modulation reduces device modulates
Figure.
Specific embodiment
To make the object, technical solutions and advantages of the present invention clearer, the present invention is made below in conjunction with attached drawing further
Ground is described in detail.
The embodiment of the present invention is illustrated below in conjunction with Figure of description, it should be understood that described herein preferred
Embodiment is merely to illustrate and explain the present invention, and is not intended to limit the present invention.And in the case where not colliding, the present invention
Embodiment in feature can be combined with each other, the technical solution formed is within protection scope of the present invention.
Fig. 2 shows the block diagrams that the EMI according to embodiments of the present invention based on phase-modulation reduces device.As shown in Fig. 2,
The EMI based on phase-modulation of the present embodiment reduces device and includes：
Phase offset generator 201, each modulation for variable phase pushing figure to be applied to input signal follow
Ring；
Phase-modulation read-only memory 202 is for determine the phase pushing figure applied in particular moment for preserving
Number；And
Phase controller 203, for exporting with the modulated signal of phase pushing figure determined by coefficient,
Wherein, the modulated signal of output has very small phase offset, such as down to +/- 0.05%, more there is specific feelings
Under condition, phase offset can be less than +/- 0.05%, for the situation more than +/- 0.05%, can similarly reach realization phase
Modulation control, and the modulated signal exported has the modulation ratio more than 1, is reduced so as to provide excellent EMI.
Further, Fig. 3 shows that input signal reduces device tune by the EMI based on phase-modulation of the embodiment of the present invention
Output signal after system.As shown in figure 3, the period of input signal is T, and after the EMI by the present invention reduces device modulates, output
Signal increases small variations δ t every several cycles, in other words, the modulated signal of output have very small phase offset and
With the modulation ratio more than 1, reduced so as to provide excellent EMI.
The following specifically describes the calculating of modulation ratio.
First, frequency shift (FS) Δ f is calculated by phase offset φ (t) and modulation rate Fm.Wherein, T is the week of signal
Phase, δ T are period migration (in half brew cycle).
Phase offset φ (t)=δ T/T
Tm=modulation periods=1/Fm
(in half brew cycle) frequency shift (FS) Δ f=φ (t)/(Tm/2)
(in robust modulation cycle) frequency shift (FS) Δ f=(2* φ (t))/Tm
(in robust modulation cycle) frequency shift (FS) Δ f=(2* δ T/T)/Tm
(in robust modulation cycle) frequency shift (FS) Δ f=(2* δ T)/(T*Tm)
N is modulation rate divisor, i.e. ROM counters maximum count value.
Tm=N*T*R, wherein R are the length of phase offset ROM, then
(in robust modulation cycle) frequency shift (FS) Δ f=(2* δ T)/(N*R*T^2)
Wherein, controlled variable is：δ T, N and R, then
Modulation ratio β=Δ f/Fm, wherein Fm=1/Tm, wherein, Δ f is that the sum frequency formed on input frequency Fin is inclined
Difference, then
β=Δ f*Tm, with reference to above equation, then
β=(2* δ T)/T
Wherein, for wide-band modulation β>>1, and
When complete cycle postpones, Max β=2*T/T=2.
Fig. 4 shows that the EMI according to embodiments of the present invention based on phase-modulation reduces the phase offset generator of device
The block diagram of one embodiment.As shown in figure 4, in the present embodiment, phase offset generator includes constrained by sequence of current
The delay line that buffer 401-403 is formed, input signal are fed in delay line, and the propagation time of each buffer is by being fed to
The magnitude of current control of the buffer.By changing electric current, to change delay, so as to generate the modulation of delay.
Fig. 5 shows that the EMI according to embodiments of the present invention based on phase-modulation reduces the phase offset generator of device
The block diagram of another embodiment.As shown in figure 5, in the present embodiment, phase offset generator includes：
Variable load element 501, is arranged in the path of input signal, for changing input signal by changing load
Slope；And
Buffer 502, for the sharp edge rate for restoring the signal of slope change and relative to first along delay is generated, to change
Phase pushing figure.
In the present embodiment, variable load element is capacitive element, however, the present invention is not limited thereto, variable load member
Part can also be the combination of resistance element, inductive element or whole threes or arbitrary the two.Input is supplied to by changing
The load of signal, delay or phase offset continuously along between also change, so as to generate the modulation of delay.
In the above two embodiments, it can also digitally be controlled using digital analog converter respectively in connection with simulation control
System delay or the analog variation of load.
In another embodiment, phase offset generator can also include being formed and being had by multiple individual delay elements
There is multiple grades of the tapped delay line individually accessed, wherein by delay element being controlled to change phase pushing figure in arbitrary number of level.
For example, there can be 10 grades of delay lines, wherein each delay-level is equal to such as 1 second.Any level can be selected to obtain 1,2,3 etc.
Until the delay of 10 seconds.If our taps at grade 3, obtain 3 seconds and postpone.
Hereinafter, specifically describing the EMI based on phase-modulation according to embodiments of the present invention reduces the phase offset of device only
Read memory (ROM).
Phase-modulation ROM preserves coefficient and required phase offset or delay is applied to input signal and (treats phase-modulation
Signal) sequence.In one embodiment, phase-modulation ROM can include look-up table, wherein the control by being supplied to look-up table
Word processed selects to postpone.This may be embodied as combined logic block or by arbitrary other modes.
In another embodiment, phase-modulation ROM can include each element by ROM address choices row and column tradition
ROM frameworks.Note that the extension for these any methods will be compiled by any stage manufactured to interface programming or in circuit
Journey, and introduce the ability dynamically programmed to these ROM coefficients.This will allow to advanced optimize device to adapt to require.
Total maximum phase offset that input signal is subjected to determines that maximum phase deviates and modulated signal thus
Maximum frequency deviates.The rate of phase-modulation ROM offer phase pushing figures determines the modulation rate of modulated signal.ROM coefficients
The rate of change can control in many ways, one of them is by counter, which is supplied to " address "
ROM。
With reference to Fig. 6, show that the EMI according to embodiments of the present invention based on phase-modulation reduces the phase-modulation of device only
Read the block diagram of memory (ROM).As shown in fig. 6, counter calculated by input signal timing and modulation rate it is as follows：
Fm=Fin/ (D × N)
Wherein, Fm is modulation rate, and Fin is input frequency, and D is input divisor, and N is ROM counter maximum count values, and
And assume that ROM counters sequentially count down to N from 1.
Fig. 7 shows the spectrogram of unmodulated clock signal.Fig. 8 shows according to embodiments of the present invention based on phase-modulation
EMI reduce device modulates clock signal spectrogram.As shown in fig. 7, unmodulated clock signal normalizes to 0dB, and
In fig. 8, the peak amplitude of the harmonic wave by the modulated clock signal of sine wave phase is suppressed, such as in frequency f0
Under, peak amplitude declines 6dB.
According to another aspect of the present invention, a kind of EMI reduction methods based on phase-modulation are additionally provided, including：
By phase offset generator, variable phase pushing figure is applied to each brew cycle of input signal；
By phase-modulation read-only memory, the coefficient for determining the phase pushing figure applied in particular moment is preserved；
And
By phase controller, output is with the modulated signal of phase pushing figure determined by the coefficient.
The modulated signal with it is minimum down to +/- less than 0.05% phase offset and with more than 1 modulation ratio,
It is reduced so as to provide excellent EMI.
In conclusion by the present invention in that phase tune is carried out to clock signal with the delay or phase offset curve of optimization
The energy frequency spectrum extension so that clock signal is made, so as to reduce EMI transmittings, wherein generating maximum using minimum frequency shift (FS)
Flat spectral response.Since the present invention is without using backfeed loop and with minimum component, so as to increase the total of system
Body reliability.
Although embodiment disclosed in the present application is as above, the content is only to facilitate understanding the application and adopting
Embodiment is not limited to the application.Technical staff in any the application technical field is not departing from this
Under the premise of the disclosed spirit and scope of application, any modification and change can be made in the implementing form and in details,
But the protection domain of the application, still should be subject to the scope of the claims as defined in the appended claims.
Claims (20)
1. a kind of EMI based on phase-modulation reduces device, which is characterized in that including：
Phase offset generator, for variable phase pushing figure to be applied to each brew cycle of input signal；
Phase-modulation read-only memory, for be stored in particular moment apply phase pushing figure when identified coefficient；And
Phase controller, for exporting with the modulated signal of phase pushing figure determined by the coefficient.
2. the EMI according to claim 1 based on phase-modulation reduces device, which is characterized in that the modulated signal tool
Have it is minimum down to +/- less than 0.05% phase offset and with more than 1 modulation ratio.
3. the EMI according to claim 1 based on phase-modulation reduces device, which is characterized in that the phase offset hair
Raw device includes：The delay line being made of multiple current limited type buffers, wherein, it is fed to each current limited type by changing
The magnitude of current of buffer changes the phase pushing figure.
4. the EMI according to claim 1 based on phase-modulation reduces device, which is characterized in that the phase offset hair
Raw device includes：
Variable load element is arranged in the path of the input signal, for changing the input by changing load
The slope of signal；And
Buffer, for the sharp edge rate for restoring the signal of slope change and relative to first along delay is generated, to change the phase
Position offset.
5. the EMI according to claim 4 based on phase-modulation reduces device, which is characterized in that the variable load member
Part includes：Capacitive element, resistance element, inductive element or their arbitrary combination.
6. the EMI according to claim 1 based on phase-modulation reduces device, which is characterized in that the phase offset hair
Raw device includes：It is made of multiple individual delay elements and with multiple grades of the tapped delay line individually accessed, wherein logical
It crosses and delay element is controlled to change the phase pushing figure in arbitrary number of level.
7. the EMI according to claim 1 based on phase-modulation reduces device, which is characterized in that the phase-modulation is only
Memory is read to include：Look-up table, the look-up table are provided with control word, for determining the phase pushing figure applied in particular moment
Coefficient.
8. the EMI according to claim 1 based on phase-modulation reduces device, which is characterized in that the phase-modulation is only
Memory is read to include：With each element by read-only memory address choice row and column read-only memory framework.
9. the EMI according to claim 7 or 8 based on phase-modulation reduces device, which is characterized in that the coefficient changes
Rate changed by counter, address is supplied to the phase-modulation read-only memory, the modulation by the counter
The modulation rate of signal is obtained by following formula：
Fm=Fin/ (D × N)
Wherein, Fm is modulation rate, and Fin is input frequency, and D is input divisor, and N is ROM counter maximum count values, and false
Determine ROM counters and sequentially count down to N from 1.
10. the EMI according to claim 2 based on phase-modulation reduces device, which is characterized in that the meter of the modulation ratio
Calculation mode is：Modulation ratio β=Δ f/Fm, wherein Δ f are the sum frequency deviation formed on input frequency Fin, and Fm is modulation frequency
Rate；The modulation ratio maximum value is 2.
11. a kind of EMI reduction methods based on phase-modulation, which is characterized in that including：
By phase offset generator, variable phase pushing figure is applied to each brew cycle of input signal；
By phase-modulation read-only memory, preserve to apply coefficient determined by phase pushing figure in particular moment；And
By phase controller, output is with the modulated signal of phase pushing figure determined by the coefficient.
12. the EMI reduction methods according to claim 11 based on phase-modulation, wherein, the modulated signal has most
Down to +/- less than 0.05% phase offset and with more than 1 modulation ratio.
13. the EMI reduction methods according to claim 11 based on phase-modulation, wherein, the phase offset generator
Including：The delay line being made of multiple current limited type buffers, wherein, it is fed to each current limited type buffering by changing
The magnitude of current of device changes the phase pushing figure.
14. the EMI reduction methods according to claim 11 based on phase-modulation, wherein, the phase offset generator
Including：
Variable load element is arranged in the path of the input signal, for changing the input by changing load
The slope of signal；And
Buffer, for the sharp edge rate for restoring the signal of slope change and relative to first along delay is generated, to change the phase
Position offset.
15. the EMI reduction methods according to claim 14 based on phase-modulation, which is characterized in that the variable load
Element includes：Capacitive element, resistance element, inductive element or their arbitrary combination.
16. the EMI reduction methods according to claim 11 based on phase-modulation, which is characterized in that the phase offset
Generator includes：It is made of multiple individual delay elements and with multiple grades of the tapped delay line individually accessed, wherein
By delay element being controlled to change the phase pushing figure in arbitrary number of level.
17. the EMI reduction methods according to claim 11 based on phase-modulation, which is characterized in that the phase-modulation
Read-only memory includes：Look-up table, the look-up table are provided with control word, for determining the phase offset applied in particular moment
The coefficient of amount.
18. the EMI reduction methods according to claim 11 based on phase-modulation, which is characterized in that the phase-modulation
Read-only memory includes：With each element by read-only memory address choice row and column read-only memory framework.
19. the EMI reduction methods based on phase-modulation according to claim 17 or 18, which is characterized in that the coefficient
The rate of change is changed by counter, and address is supplied to the phase-modulation read-only memory by the counter, described
The modulation rate of modulated signal is obtained by following formula：
Fm=Fin/ (D × N)
Wherein, Fm is modulation rate, and Fin is input frequency, and D is input divisor, and N is ROM counter maximum count values, and false
Determine ROM counters and sequentially count down to N from 1.
20. the EMI reduction methods according to claim 12 based on phase-modulation, which is characterized in that the modulation ratio
Calculation is：Modulation ratio β=Δ f/Fm, wherein, Δ f is the sum frequency deviation formed on input frequency Fin, and Fm is modulation
Frequency；The modulation ratio maximum value is 2.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111897393A (en) * | 2020-07-31 | 2020-11-06 | 卡莱特（深圳）云科技有限公司 | Method and device for reducing electromagnetic compatibility of LED control system and electronic equipment |
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| CN111897393A (en) * | 2020-07-31 | 2020-11-06 | 卡莱特（深圳）云科技有限公司 | Method and device for reducing electromagnetic compatibility of LED control system and electronic equipment |
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