CN103546023B - A kind of method suppressing multiple Switching Power Supply beat frequency noise - Google Patents
A kind of method suppressing multiple Switching Power Supply beat frequency noise Download PDFInfo
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- CN103546023B CN103546023B CN201310528727.2A CN201310528727A CN103546023B CN 103546023 B CN103546023 B CN 103546023B CN 201310528727 A CN201310528727 A CN 201310528727A CN 103546023 B CN103546023 B CN 103546023B
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Abstract
Suppress a method for multiple Switching Power Supply beat frequency noise, relate to the Power Management Design field in communication system, comprising: S1. analyzes power module framework; S2. look for the analog power module that output current is greater than 6A, switching frequency interval is less than 20KHz, change one of them analog power module into digital power module, or change the analog power module that switching frequency interval is greater than 20KHz into; S3. the digital power module identical with above-mentioned condition is looked for; S4. the switching frequency arranging digital power module is spaced apart 20KHz ~ 40KHz; S5. according to switching frequency change adjustment loop parameter; S6. test loop parameter, if noise ripple does not meet communication equipment parameter, proceeds to S5; If meet, enter S7; S7. the loop parameter of described digital power module is solidified.The present invention is not changing under existing power supply framework condition, reduces the beat frequency interference between Switching Power Supply, ensures system quality, promote the quality of high speed signal.
Description
Technical field
The present invention relates to the Power Management Design field in communication system, is specifically a kind of method suppressing multiple Switching Power Supply beat frequency noise.
Background technology
Along with high-speed chip and Design of Digital System ability are strengthened, communication system complete machine operating frequency and external interface speed, gradually to high speed, super-speed development, bring new challenge to the aspect designs such as system power supply, clock, high speed signal integrality simultaneously.For communication system, system power supply mostly adopts distributed power supply mode, and Fig. 1 is common communication system Power Management Design framework, comprises multiple isolation module, multiple non-isolated module and multiple linear voltage regulator (LDO1 ... LDO N).Equipment, after the interchange or DC power supply power taking of machine room, through insulating power supply block transforms, then is converted by non-isolated power module or linear voltage regulator conversion, final for low-voltage is for device.This power supply structure supports power supply redundancy protection, and reduction equipment impacts power of computer room, ensures that faulty equipment and assembly independently exit, ensures the normal work of communication equipment.
Along with High Speed System development, device power supply (DPS) power increase, power type increases, and the requirement of power source performance improves, and this power supply structure Problems existing manifests gradually:
First, non-isolated power supply is mostly Switching Power Supply, and multiple close switching frequency can cause beat frequency issues.Phenomenon is the most intuitively: when the isolation module of two close switching frequencies works simultaneously, often can hear howling; The switching frequency of adjustment one piece of isolation module, howling disappears immediately.Beat frequency causes seeing an envelope ripple in output, the more difficult filtering of beat frequency noise of extremely low frequency.Utilize oscilloscope, can observe the 2kHz envelope ripple of the output superposition of 500kHz switching frequency power supply.
In addition, for whole power supply system, bus power source carries multiple non-isolated module, is used to provide multiple low-voltage dc power supply.Multiple non-isolated module produces ripple reflected current in its input port, and ripple is superimposed upon input power bus, and mutually conducts crosstalk by bus at non-isolated intermodule, has influence on the output of various low-tension supply.Experiment shows, as long as multiple non-isolated module works simultaneously, all can by bus conduct beat frequency noise, and if noise power anti-noise ability that is enough large or chip is poor, beat frequency noise produces many-sided impact to circuit and not easily discovers.Power supply beat frequency noise is as follows for the major effect of communication system:
1) influential system clock quality: clock spectrum is not dull, introduces noise in links such as clock are comprehensive, causes signal jitter excessive.
2) high speed signaling quality: cause high speed signal error code, power supply beat frequency noise directly has influence on the normal work of signal amplitude and CDR, has influence on Clock Extraction and the signal decision of high speed signal.
Summary of the invention
For the defect existed in prior art, the object of the present invention is to provide a kind of method suppressing multiple Switching Power Supply beat frequency noise, do not changing under existing power supply framework condition, reduce the beat frequency interference between Switching Power Supply, ensure system time quality, promote the quality of high speed signal.
For reaching above object, the technical scheme that the present invention takes is: a kind of method suppressing multiple Switching Power Supply beat frequency noise, comprises the steps: the power module framework of S1. analyzing communication equipment, and power module comprises analog power module and digital power module; S2. in analog power module range, find out the analog power module that output current is greater than 6A, switching frequency interval is less than 20KHz, one of them analog power module is changed to digital power module, or changes to the analog power module making the switching frequency interval between power module be greater than 20KHz; S3., in digital power module range, the digital power module that output current is greater than 6A, switching frequency interval is less than 20KHz is found out; S4. according to the power module that S2 and S3 finds out, the switching frequency of these digital power modules is set, makes the switching frequency between power module be spaced apart 20KHz ~ 40KHz; S5. according to the switching frequency adjustment loop parameter after arranging, loop stability is ensured; S6. the loop parameter after each switch of the power supply module set of frequency is tested, if when noise ripple does not meet communication equipment parameter, proceed to S5; If meet communication equipment parameter, enter S7; S7. the loop parameter of described digital power module is solidified, stored in the program storage chip of digital power.
On the basis of technique scheme, described analog power module mostly is two most, and during two analog power modules, the switching frequency of an analog power module must be had adjustable.
On the basis of technique scheme, in described S4, when the switching frequency interval of digital power module is set, find out the power module that output current is maximum, the switching frequency of itself and other power module is set to and is greater than 30KHz.
On the basis of technique scheme, in described S6, use oscilloscope to require to test according to the ripple of all chips of communication equipment, the loop parameter after each switch of the power supply module set of frequency is required to meet: the noise ripple of all chips is less than the specification requirement of communication equipment.
On the basis of technique scheme, in described S7, utilize the PMBUS bus of digital power, by the output voltage of digital power module, switching frequency and the loop parameter program storage chip stored in digital power module.
Beneficial effect of the present invention is: by arranging the switching frequency of power module, as used the PMBUS bus (logic control bus) of digital power, or the switching frequency of customization analog power, by control switch frequency interval (more than 20K hertz), effectively can reduce beat frequency noise, effectively reduce the relative influence of switching frequency between disparate modules, elevator system signal quality and transmission performance.
Accompanying drawing explanation
Fig. 1 is communication system Power Management Design Organization Chart common in background technology;
Fig. 2 is the method flow diagram that the embodiment of the present invention suppresses multiple Switching Power Supply beat frequency noise;
Fig. 3 is the checking schematic diagram of power supply ripple in step S6.
Embodiment
Below in conjunction with drawings and Examples, the present invention is described in further detail.
The present invention suppresses the method for multiple Switching Power Supply beat frequency noise, is used to provide the supply voltage that communication equipment needs, and because power module comprises analog power module and digital power module, the present invention is applicable to the mode that power module great majority adopt Digital Implementation.The scope be suitable for is: the quantity of analog power module mostly is two most, and switching frequency interval is less than 20KHz, when there being two analog power modules, the switching frequency of an analog power module must be had adjustable.Because during the switching frequency intermodulation of power module not of the same race, its operating frequency is more close, and the low frequency component of beat frequency noise is more difficult to by the filtering of L-C filter network.Meanwhile, for communication system, the frequency band of its output signal filter is arranged on 20KHz ~ 80MHz, when not increasing design cost, utilizing wrong frequency method, can reduce the beat frequency noise of switching frequency.
As shown in Figure 2, the present invention suppresses the method for multiple Switching Power Supply beat frequency noise, and detailed step is as follows:
S1. the power module framework of analyzing communication equipment, determines the implementation and switching frequency, the output current size that use power module.
S2. in analog power module range, find out the analog power module that output current is greater than 6A, switching frequency interval is less than 20KHz, one of them analog power module is changed to digital power module, or changes to the analog power module making the switching frequency interval between power module be greater than 20KHz.
S3., in digital power module range, the digital power module that output current is greater than 6A, switching frequency interval is less than 20KHz is found out.The available PMBUS bus of digital power module, and can be used to dynamically arrange digital module parameter, comprise the functions such as the switching frequency regulating digital power module.
S4. according to the power module that S2 and S3 finds out, the switching frequency of these power modules is set, the switching frequency of digital power module is set, make the switching frequency between power module be spaced apart 20KHz ~ 40KHz.When the switching frequency interval of digital power module is set, find out the power module that output current is large, this power module is set to the switching frequency of other power module and is greater than 30KHz.
S5. the switching frequency adjustment loop parameter after arranging according to power module, loop parameter relates to phase margin, loop bandwidth, ensures loop stability.
S6. test the loop parameter after each switch of the power supply module set of frequency, as shown in Figure 3, the power supply of power module exports and accesses oscilloscope by coaxial cable, and in the present embodiment, coaxial cable is 50 Ω, and oscilloscope is 1M Ω, 20M bandwidth.Ripple parameter request according to all chips of communication equipment is tested, and when testing the loop parameter after each switch of the power supply module set of frequency, all needs to reach: the noise ripple of all chips is less than the specification requirement of communication equipment.If if when noise ripple does not meet parameter in communication equipment, proceed to S5; If meet communication equipment parameter, enter S7.
S7. solidify the loop parameter of described digital power module, utilize the PMBUS bus of digital power, by the output voltage of digital power module, switching frequency and the loop parameter program storage chip stored in digital power module.When digital power module starts, ensure that the normal initialization of digital power and program are run.
The present invention is not limited to above-mentioned execution mode, and for those skilled in the art, under the premise without departing from the principles of the invention, can also make some improvements and modifications, these improvements and modifications are also considered as within protection scope of the present invention.The content be not described in detail in this specification belongs to the known prior art of professional and technical personnel in the field.
Claims (4)
1. suppress a method for multiple Switching Power Supply beat frequency noise, it is characterized in that, comprise the steps:
S1. the power module framework of analyzing communication equipment, power module comprises analog power module and digital power module; The quantity of analog power module mostly is two most, when there being two analog power modules, the switching frequency of an analog power module must be had adjustable;
S2. in analog power module range, find out the analog power module that output current is greater than 6A, switching frequency interval is less than 20KHz, one of them analog power module is changed to digital power module, or changes to the analog power module making the switching frequency interval between described power module be greater than 20KHz;
S3., in digital power module range, the digital power module that output current is greater than 6A, switching frequency interval is less than 20KHz is found out;
S4. according to the power module that S2 and S3 finds out, the switching frequency of wherein digital power module is set, makes the switching frequency between described power module be spaced apart 20KHz ~ 40KHz;
S5. the switching frequency adjustment loop parameter after arranging according to power module, ensures loop stability;
S6. the loop parameter after each switch of the power supply module set of frequency is tested, if when noise ripple does not meet communication equipment parameter, proceed to S5; If meet communication equipment parameter, enter S7;
S7. the loop parameter of described digital power module is solidified, stored in the program storage chip of digital power module.
2. the method suppressing multiple Switching Power Supply beat frequency noise as claimed in claim 1, it is characterized in that: in described S4, when the switching frequency interval of digital power module is set, find out the described power module that output current is maximum, the switching frequency of power module described in itself and other is set to and is greater than 30KHz.
3. the method suppressing multiple Switching Power Supply beat frequency noise as claimed in claim 1, it is characterized in that: in described S6, use oscilloscope to require to test according to the ripple of all chips of communication equipment, the loop parameter after each switch of the power supply module set of frequency is required to meet: the noise ripple of all chips is less than the specification requirement of communication equipment.
4. the method suppressing multiple Switching Power Supply beat frequency noise as claimed in claim 1, it is characterized in that: in described S7, utilize the PMBUS bus of digital power module, by the output voltage of digital power module, switching frequency and the loop parameter program storage chip stored in digital power module.
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| CN108141130A (en) * | 2015-09-15 | 2018-06-08 | 日本电气株式会社 | The driver of switching power system, the driving method of Switching power and Switching power |
| CN111600367B (en) * | 2020-05-09 | 2023-10-20 | 华为技术有限公司 | Method and device for controlling transmitting frequency in wireless charging and related equipment |
| CN112803738B (en) * | 2021-01-04 | 2022-05-13 | 烽火通信科技股份有限公司 | Circuit for inhibiting beat frequency of switching power supply and implementation method thereof |
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| CN101335524A (en) * | 2007-06-25 | 2008-12-31 | 上海市闵行中学 | Method for reducing electrical power noise in high-speed ADC application |
| CN102916571A (en) * | 2012-09-29 | 2013-02-06 | 西安空间无线电技术研究所 | Power supply capable of suppressing low-frequency noises |
| CN102938607A (en) * | 2012-11-16 | 2013-02-20 | 矽力杰半导体技术(杭州)有限公司 | Low-noise multi-output power circuit and control method thereof |
| CN103051346A (en) * | 2012-12-03 | 2013-04-17 | 惠州市德赛西威汽车电子有限公司 | Sound reception device and method preventing switch power interference |
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| JPS6030157B2 (en) * | 1980-06-03 | 1985-07-15 | 日本電気株式会社 | Multi-output switching power supply circuit |
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| CN101335524A (en) * | 2007-06-25 | 2008-12-31 | 上海市闵行中学 | Method for reducing electrical power noise in high-speed ADC application |
| CN102916571A (en) * | 2012-09-29 | 2013-02-06 | 西安空间无线电技术研究所 | Power supply capable of suppressing low-frequency noises |
| CN102938607A (en) * | 2012-11-16 | 2013-02-20 | 矽力杰半导体技术(杭州)有限公司 | Low-noise multi-output power circuit and control method thereof |
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Effective date of registration: 20200813 Address after: 430000 part of the third floor of cable building, Guandong science and Technology Park, Donghu New Technology Development Zone, Wuhan, Hubei Province Patentee after: Wuhan Changjiang Computing Technology Co., Ltd Address before: China Science and Technology Park Dongxin road East Lake Development Zone 430074 Hubei Province, Wuhan City, No. 5 Patentee before: FIBERHOME TELECOMMUNICATION TECHNOLOGIES Co.,Ltd. |