CN108039816A - A kind of feedovered using AC improves the novel frequency modulator approach and device of EMI - Google Patents
A kind of feedovered using AC improves the novel frequency modulator approach and device of EMI Download PDFInfo
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- CN108039816A CN108039816A CN201711394211.8A CN201711394211A CN108039816A CN 108039816 A CN108039816 A CN 108039816A CN 201711394211 A CN201711394211 A CN 201711394211A CN 108039816 A CN108039816 A CN 108039816A
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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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- Dc-Dc Converters (AREA)
Abstract
The present invention provides a kind of feedovered using AC to improve the novel frequency modulator approach and device of EMI, feedovered using AC, from AC voltage over zero to peak point switching frequency within the cycle, complete a frequency jitter, and periodically change, it is minimum in AC voltage zero-cross dot frequencies, in AC voltage peak dot frequency highests, frequency distribution changes, and makes higher several or tens frequencies the power dissipations of original amplitude to new composition；The present invention is according to setting method cyclically-varying frequency, overtone order is higher, frequency dispersion is bigger, noise harmonic frequency is disperseed, make the superposition of each harmonic energy at switching frequency reduce, noise energy is dispersed, reduces, and ensure that magnitude margin over the entire frequency band, so as to meet EMC Requirements.
Description
Technical field
The present invention relates to the technical field of Switching Power Supply, and in particular to a kind of feedovered using AC improves the novel frequency of EMI
Modulator approach and device.
Background technology
Switching Power Supply is to utilize modern power electronics technology, the time ratio of controlling switch pipe turn-on and turn-off, remains steady
Determine a kind of power supply of output voltage, Switching Power Supply is generally made of pulse width modulation (PWM) control IC and MOSFET.With electricity
The development and innovation of power electronic technology so that switch power technology is also being constantly brought forth new ideas.Switching type power supply topology is because of power consumption at present
Small, the features such as high conversion efficiency, small in volume, voltage stabilized range is wide, is widely applied to almost all of electronic equipment, is
Current electronics and information industry develops rapidly a kind of indispensable power mode.
But Switching Power Supply is operated in out there are more serious switch interference by the power MOSFET inside Switching Power Supply
Off status, the ac pulse voltage and electric current that it is produced produce spike interference and harmonic wave interference by other devices in circuit,
If these interference do not take certain measure to carry out suppressing elimination and shielding, the normal work of complete machine will be severely impacted.
Further, since switching power supply does not have the isolation of Industrial Frequency Transformer, these interference can seal in common frequency power network, make neighbouring other
Electronic equipment and household electrical appliance are heavily disturbed.In order to suppress harmonic wave, electromagnetic pollution is reduced, EMI suppresses to become electric power
The key areas of electronic technology research.
Typical PWM type Switching Power Supplies schematic diagram such as attached drawing 1, PWM frequency is constant, not with exchange input change, such as attached drawing 2
Shown, EMI is mainly (di/dt) produced by quick change of the curtage of PWM switching tubes to the time, it is produced by two
Aspect determines：Frequency and amplitude.The distribution of frequency is depending on switching frequency fs and the upper fall time tr and tf of switching pulse.It is right
Noise signal carries out frequency analysis, can draw the amplitude and phase angle of each harmonic in harmonic wave forms.Each harmonic amplitude is with frequency
Distribution be known as width density spectral.At frequency f1, the harmonic amplitude that bandwidth is Δ f is F (f1) Δs f.Periodic interference signals
Frequency spectrum be discrete type, each height of spectral line is second harmonic, the amplitude of triple-frequency harmonics, and the distance between each spectral line is fundamental frequency
Integral multiple.The harmonic wave interference energy for determining the generation of frequency PWM switching pulses is relatively concentrated.Its spectrum distribution, as shown in Figure 3,
Noise harmonic frequency is concentrated, and improves the superposition of each harmonic energy at fs, noise energy is able to concentrate, increases, whole
Magnitude margin is reduced on frequency band, so as to reduce Electro Magnetic Compatibility.
The content of the invention
Based on the above problem, the present invention, which proposes a kind of feedover using AC, improves the novel frequency modulator approach and dress of EMI
Put, take PWM switching type power supply topology frequency modulating technologies.
The present invention provides following technical solution：
On the one hand, the present invention provides a kind of feedovered using AC to improve the novel frequency modulator approach of EMI, the method bag
Include：
Feedovered using AC, the AC alternating voltages for sampling acquisition are divided into 256 equal portions, are set in AC voltage over zero
Original frequency is minimum frequency fmin, is peak frequency fmax in AC voltage peaks point；The timing since zero crossing, per T/256
Time changes a secondary frequencies, and T is the alternating current cycle, AC voltages from 0 ° of phase in the 1/4T times of 90 ° of phases by dsp chip
Portion's counter counts 64 times, and each conversion frequencies increase (fmax-fmin)/64Hz；
Continue to count 64 times by dsp chip internal counter and reach 128 times, negative half-cycle repeats to act above, from counting 128
It is secondary that peak frequency is progressively increased to by minimum frequency to 192 secondary frequencies, from counting 192 times to 256 secondary frequencies gradually by maximum frequency
Rate is reduced to minimum frequency, and in the zero crossing that next cycle starts, DSP resets counter inside counting 256, and next cycle repeats
Act above.
Wherein, AC alternating voltages alternating current cycle T=20ms.
Wherein, the minimum frequency is 61KHz, and the peak frequency is 69KHz.
In addition, present invention also offers a kind of feedovered using AC to improve the novel frequency modulating device of EMI, described device bag
Include：AC signal processing modules, frequency conversion concussion module；
The AC signal processing modules are feedovered using AC, and the AC alternating voltages for sampling acquisition are divided into 256 equal portions, if
The original frequency for being scheduled on AC voltage over zero is minimum frequency fmin, is peak frequency fmax in AC voltage peaks point；The change
Frequency concussion module timing since zero crossing, changes a secondary frequencies per the T/256 times, and T is the alternating current cycle, and AC voltages are from 0 ° of phase
Counted 64 times by dsp chip internal counter in the 1/4T times of 90 ° of phases, each conversion frequencies increase (fmax-
Fmin)/64Hz, negative half-cycle, next cycle repeat to act above.
Wherein, AC alternating voltages alternating current cycle T=20ms.
Wherein, the minimum frequency is 61KHz, and the peak frequency is 69KHz.
The present invention provides a kind of feedovered using AC to improve the novel frequency modulator approach and device of EMI, is feedovered using AC,
From AC voltage over zero to peak point switching frequency within the cycle, a frequency jitter is completed, and is periodically changed, in AC electricity
It is minimum to press through zero frequency, in AC voltage peak dot frequency highests, frequency distribution changes, and makes higher several of original amplitude
Or the power dissipation of tens frequencies is to new composition；For the present invention according to setting method cyclically-varying frequency, overtone order is higher,
Frequency dispersion is bigger, and noise harmonic frequency is disperseed, and makes the superposition of each harmonic energy at switching frequency reduce, and noise energy obtains
With scattered, reduction, magnitude margin is ensure that over the entire frequency band, so as to meet EMC Requirements.
Brief description of the drawings
Fig. 1 is the typical PWM types Switching Power Supply schematic diagram of the prior art；
Fig. 2 is the PWM switching pulse figures of the Switching Power Supply of the prior art；
Fig. 3 is the frequency spectrum profile of the prior art；
Fig. 4 is the Switching Power Supply schematic diagram of the present invention；
Fig. 5 is the switching power circuit figure of the present invention；
Fig. 6 is the PWM switching pulse figures of the Switching Power Supply of the present invention；
Fig. 7 is the frequency spectrum profile of the present invention.
Embodiment
To describe the technical solutions in the embodiments of the present invention more clearly, below will be to needed in the embodiment
Attached drawing is briefly described, it should be apparent that, drawings in the following description are only some embodiments of the present invention, for ability
For the those of ordinary skill of domain, without creative efforts, it can also be obtained according to these attached drawings other attached
Figure.
On the one hand, embodiments of the present invention, which provide a kind of feedover using AC, improves the novel frequency modulator approach of EMI,
The described method includes：
Feedovered using AC, the AC alternating voltages for sampling acquisition are divided into 256 equal portions, are set in AC voltage over zero
Original frequency is minimum frequency fmin, is peak frequency fmax in AC voltage peaks point；The timing since zero crossing, per T/256
Time changes a secondary frequencies, and T is the alternating current cycle, AC voltages from 0 ° of phase in the 1/4T times of 90 ° of phases by dsp chip
Portion's counter counts 64 times, and each conversion frequencies increase (fmax-fmin)/64Hz；
As shown in figures 4 and 5, in attached drawing 5, R5-R8, R10-R13 and VAC_N and VAC_L are AC signal processings；
R9-C4-AC04 and R14-C5-AC00 is oscillation inverter；PWM is DPS output controls；V_oulk is PID modules；R15-R19
Part is referrer module.Using AC feed-forward techniques, the AC alternating voltages sampled (alternating current cycle T=20ms) are divided into
256 equal portions (count 256 times).The original frequency for being set in AC voltage over zero is minimum frequency fmin=61KHz, in AC voltages
Peak point is peak frequency fmax=69KHz.
The timing since zero crossing, changes a secondary frequencies per the T/256=78.125ns times.AC voltages are from 0 ° of phase to 90 ° of phases
Position
Counted 64 times by dsp chip internal counter in the 1/4T times, each conversion frequencies increase (fmax-fmin)/
64=125Hz.For AC voltages at 90 ° of phases of crest voltage, switching frequency fs increases to 69KHz at this time.Since at 90 ° of phases
Timing, changes a secondary frequencies per 78.125ns, and each conversion frequencies reduce 125Hz.
Continue to count 64 times by dsp chip internal counter and reach 128 times, negative half-cycle repeats to act above, from meter
Number progressively increases to peak frequency 128 times to 192 secondary frequencies by minimum frequency, from counting 192 times to 256 secondary frequencies gradually by most
Big frequency is reduced to minimum frequency, and in the zero crossing that next cycle starts, DSP resets counter inside counting 256, next cycle
Acted more than repeating.
Continue to count 64 times by dsp chip internal counter and reach 128 times, AC voltages are in 180 ° of phases of zero crossing at this time
Place, switching frequency fs is reduced to 61KHz herein.Negative half-cycle repeat more than act, from count 128 times to 192 secondary frequencies by
61KHz progressively increases to peak frequency 69KHz, and gradually minimum frequency is reduced to by 69kHz to 256 secondary frequencies from counting 192 times
61KHz.In the zero crossing that next cycle starts, DSP resets counter inside counting 256, and next cycle repeats to act above.
From AC voltage over zero to peak point switching frequency fs in 5ms cycle (frequency 200Hz), complete once from
61kHz is periodically changed in the range of 4kHz up and down to the frequency jitter between 69kHz centered on 65kHz.In AC voltages
The minimum 61KHz of zero passage dot frequency, in AC voltage peak dot frequency highest 69KHz, frequency distribution changes (having added radio-frequency component),
Make higher several or tens frequencies the power dissipations of original amplitude to new composition, as shown in Figure 6.
Fundamental frequency change amplitude is ± 4kHz, and second harmonic is ± 8kHz ..., and nth harmonic is ± 4nkHz.Overtone order
Higher, frequency dispersion is bigger.In this way, noise harmonic frequency is disperseed, make the superposition of each harmonic energy at fs reduce, noise energy
Amount is dispersed, reduces, and magnitude margin is ensure that over the entire frequency band, so as to meet EMC Requirements.Its spectrum distribution
As shown in Figure 7.
After AC feed-forward techniques, the quasi-peak value (QP) of noise signal changes little, decline about 2dB with frequency increase, and
The average value (AV) of noise signal is fairly obvious with frequency increase decline, so frequency jitter is in high band significant effect.
The method of the present invention noise harmonic frequency is disperseed, and makes the superposition of each harmonic energy at fs reduce, and noise energy is dispersed, subtracts
It is small, it ensure that magnitude margin over the entire frequency band.
The present invention provides a kind of feedovered using AC to improve the novel frequency modulator approach of EMI, is feedovered using AC, from AC electricity
Zero point is pressed through to peak point switching frequency within the cycle, completes a frequency jitter, and is periodically changed, in AC voltage zero-cross
Dot frequency is minimum, and in AC voltage peak dot frequency highests, frequency distribution changes, and makes higher several of original amplitude or tens
The power dissipation of a frequency is to new composition；The present invention is according to setting method cyclically-varying frequency, and overtone order is higher, frequency point
Scattered bigger, noise harmonic frequency is disperseed, and makes the superposition of each harmonic energy at switching frequency reduce, and noise energy is divided
Dissipate, reduce, magnitude margin is ensure that over the entire frequency band, so as to meet EMC Requirements.
On the other hand, embodiments of the present invention, which provide a kind of feedover using AC, improves the novel frequency modulation dress of EMI
Put, described device includes：AC signal processing modules, frequency conversion concussion module；
The AC signal processing modules are feedovered using AC, and the AC alternating voltages for sampling acquisition are divided into 256 equal portions, if
The original frequency for being scheduled on AC voltage over zero is minimum frequency fmin, is peak frequency fmax in AC voltage peaks point；
As shown in figures 4 and 5, in attached drawing 5, R5-R8, R10-R13 and VAC_N and VAC_L are AC signal processings；
R9-C4-AC04 and R14-C5-AC00 is oscillation inverter；PWM is DPS output controls；V_oulk is PID modules；R15-R19
Part is referrer module.Using AC feed-forward techniques, the AC alternating voltages sampled (alternating current cycle T=20ms) are divided into
256 equal portions (count 256 times).The original frequency for being set in AC voltage over zero is minimum frequency fmin=61KHz, in AC voltages
Peak point is peak frequency fmax=69KHz.
The timing since zero crossing, changes a secondary frequencies per the T/256=78.125ns times.AC voltages are from 0 ° of phase to 90 ° of phases
Position
Counted 64 times by dsp chip internal counter in the 1/4T times, each conversion frequencies increase (fmax-fmin)/
64=125Hz.For AC voltages at 90 ° of phases of crest voltage, switching frequency fs increases to 69KHz at this time.Since at 90 ° of phases
Timing, changes a secondary frequencies per 78.125ns, and each conversion frequencies reduce 125Hz.
Module timing since zero crossing is shaken in the frequency conversion, changes a secondary frequencies per the T/256 times, and T is the alternating current cycle,
AC voltages count 64 times from 0 ° of phase to passing through dsp chip internal counter in the 1/4T times of 90 ° of phases, each conversion frequencies
Increase (fmax-fmin)/64Hz, negative half-cycle, next cycle repeat to act above.
Continue to count 64 times by dsp chip internal counter and reach 128 times, negative half-cycle repeats to act above, from meter
Number progressively increases to peak frequency 128 times to 192 secondary frequencies by minimum frequency, from counting 192 times to 256 secondary frequencies gradually by most
Big frequency is reduced to minimum frequency, and in the zero crossing that next cycle starts, DSP resets counter inside counting 256, next cycle
Acted more than repeating.
Continue to count 64 times by dsp chip internal counter and reach 128 times, AC voltages are in 180 ° of phases of zero crossing at this time
Place, switching frequency fs is reduced to 61KHz herein.Negative half-cycle repeat more than act, from count 128 times to 192 secondary frequencies by
61KHz progressively increases to peak frequency 69KHz, and gradually minimum frequency is reduced to by 69kHz to 256 secondary frequencies from counting 192 times
61KHz.In the zero crossing that next cycle starts, DSP resets counter inside counting 256, and next cycle repeats to act above.
From AC voltage over zero to peak point switching frequency fs in 5ms cycle (frequency 200Hz), complete once from
61kHz is periodically changed in the range of 4kHz up and down to the frequency jitter between 69kHz centered on 65kHz.In AC voltages
The minimum 61KHz of zero passage dot frequency, in AC voltage peak dot frequency highest 69KHz, frequency distribution changes (having added radio-frequency component),
Make higher several or tens frequencies the power dissipations of original amplitude to new composition, as shown in Figure 6.
Fundamental frequency change amplitude is ± 4kHz, and second harmonic is ± 8kHz ..., and nth harmonic is ± 4nkHz.Overtone order
Higher, frequency dispersion is bigger.In this way, noise harmonic frequency is disperseed, make the superposition of each harmonic energy at fs reduce, noise energy
Amount is dispersed, reduces, and magnitude margin is ensure that over the entire frequency band, so as to meet EMC Requirements.Its spectrum distribution
As shown in Figure 7.
After AC feed-forward techniques, the quasi-peak value (QP) of noise signal changes little, decline about 2dB with frequency increase, and
The average value (AV) of noise signal is fairly obvious with frequency increase decline, so frequency jitter is in high band significant effect.
Apparatus of the present invention noise harmonic frequency is disperseed, and makes the superposition of each harmonic energy at fs reduce, and noise energy is dispersed, subtracts
It is small, it ensure that magnitude margin over the entire frequency band.
The present invention provides a kind of feedovered using AC to improve the novel frequency modulating device of EMI, is feedovered using AC, from AC electricity
Zero point is pressed through to peak point switching frequency within the cycle, completes a frequency jitter, and is periodically changed, in AC voltage zero-cross
Dot frequency is minimum, and in AC voltage peak dot frequency highests, frequency distribution changes, and makes higher several of original amplitude or tens
The power dissipation of a frequency is to new composition；The present invention is according to setting method cyclically-varying frequency, and overtone order is higher, frequency point
Scattered bigger, noise harmonic frequency is disperseed, and makes the superposition of each harmonic energy at switching frequency reduce, and noise energy is divided
Dissipate, reduce, magnitude margin is ensure that over the entire frequency band, so as to meet EMC Requirements.
The foregoing description of the disclosed embodiments, enables those skilled in the art to realize or use the present invention.To this
A variety of modifications of a little embodiments will be apparent for a person skilled in the art, and the general principles defined herein can
Without departing from the spirit or scope of the present invention, to realize in other embodiments.Therefore, the present invention will not be limited
The embodiments shown herein is formed on, but meets the most wide model consistent with the principles and novel features disclosed herein
Enclose.
Claims (6)
1. a kind of feedovered using AC improves the novel frequency modulator approach of EMI, it is characterised in that：
Feedovered using AC, the AC alternating voltages for sampling acquisition are divided into 256 equal portions, are set in the initial of AC voltage over zero
Frequency is minimum frequency fmin, is peak frequency fmax in AC voltage peaks point；The timing since zero crossing, per the T/256 times
Change a secondary frequencies, T is the alternating current cycle, and AC voltages are from 0 ° of phase to passing through meter inside dsp chip in the 1/4T times of 90 ° of phases
Rolling counters forward 64 times, each conversion frequencies increase (fmax-fmin)/64Hz；
Continue to count 64 times by dsp chip internal counter and reach 128 times, negative half-cycle repeats to act above, from counting 128
It is secondary that peak frequency is progressively increased to by minimum frequency to 192 secondary frequencies, from counting 192 times to 256 secondary frequencies gradually by maximum frequency
Rate is reduced to minimum frequency, and in the zero crossing that next cycle starts, DSP resets counter inside counting 256, and next cycle repeats
Act above.
2. according to the method described in claim 1, it is characterized in that：AC alternating voltages alternating current cycle T=20ms.
3. according to the method described in claim 1, it is characterized in that：The minimum frequency is 61KHz, and the peak frequency is
69KHz。
4. a kind of feedovered using AC improves the novel frequency modulating device of EMI, it is characterised in that：Described device includes：The dress
Put including：AC signal processing modules, frequency conversion concussion module；
The AC signal processing modules are feedovered using AC, and the AC alternating voltages for sampling acquisition are divided into 256 equal portions, are set in
The original frequency of AC voltage over zero is minimum frequency fmin, is peak frequency fmax in AC voltage peaks point；
Module timing since zero crossing is shaken in the frequency conversion, changes a secondary frequencies per the T/256 times, and T is the alternating current cycle, and AC is electric
Pressure counts 64 times from 0 ° of phase to passing through dsp chip internal counter in the 1/4T times of 90 ° of phases, each conversion frequencies increase
(fmax-fmin)/64Hz, negative half-cycle, next cycle repeat to act above.
5. device according to claim 4, it is characterised in that：AC alternating voltages alternating current cycle T=20ms.
6. device according to claim 4, it is characterised in that：The minimum frequency is 61KHz, and the peak frequency is
69KHz。
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| Application Number | Priority Date | Filing Date | Title |
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| CN201711394211.8A CN108039816A (en) | 2017-12-21 | 2017-12-21 | A kind of feedovered using AC improves the novel frequency modulator approach and device of EMI |
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| CN201711394211.8A CN108039816A (en) | 2017-12-21 | 2017-12-21 | A kind of feedovered using AC improves the novel frequency modulator approach and device of EMI |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111092547A (en) * | 2019-12-13 | 2020-05-01 | 珠海格力电器股份有限公司 | PFC (Power factor correction) jitter frequency control method, system and electric appliance |
| WO2022134848A1 (en) * | 2020-12-24 | 2022-06-30 | 广东美的制冷设备有限公司 | Carrier frequency control method and apparatus for power factor correction, and air conditioner |
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| US20070085523A1 (en) * | 2005-04-07 | 2007-04-19 | Texas Instruments Deutschland Gmbh | Dc-dc converter |
| CN102144352A (en) * | 2008-09-05 | 2011-08-03 | 伊顿工业公司 | A power factor corrected switched mode power supply |
| CN206432893U (en) * | 2017-02-07 | 2017-08-22 | 中国长城科技集团股份有限公司 | A kind of Switching Power Supply and its denoising device |
| CN107528464A (en) * | 2017-09-22 | 2017-12-29 | 郑州云海信息技术有限公司 | A kind of frequency modulating device and method of lifting PFC efficiency |
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2017
- 2017-12-21 CN CN201711394211.8A patent/CN108039816A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20070085523A1 (en) * | 2005-04-07 | 2007-04-19 | Texas Instruments Deutschland Gmbh | Dc-dc converter |
| CN102144352A (en) * | 2008-09-05 | 2011-08-03 | 伊顿工业公司 | A power factor corrected switched mode power supply |
| CN206432893U (en) * | 2017-02-07 | 2017-08-22 | 中国长城科技集团股份有限公司 | A kind of Switching Power Supply and its denoising device |
| CN107528464A (en) * | 2017-09-22 | 2017-12-29 | 郑州云海信息技术有限公司 | A kind of frequency modulating device and method of lifting PFC efficiency |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111092547A (en) * | 2019-12-13 | 2020-05-01 | 珠海格力电器股份有限公司 | PFC (Power factor correction) jitter frequency control method, system and electric appliance |
| WO2022134848A1 (en) * | 2020-12-24 | 2022-06-30 | 广东美的制冷设备有限公司 | Carrier frequency control method and apparatus for power factor correction, and air conditioner |
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