CN103546023A - Method for suppressing beat frequency noise of multiple switch power sources - Google Patents
Method for suppressing beat frequency noise of multiple switch power sources Download PDFInfo
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- CN103546023A CN103546023A CN201310528727.2A CN201310528727A CN103546023A CN 103546023 A CN103546023 A CN 103546023A CN 201310528727 A CN201310528727 A CN 201310528727A CN 103546023 A CN103546023 A CN 103546023A
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Abstract
The invention discloses a method for suppressing beat frequency noise of multiple switch power sources, and relates to the field of power source design in a communication system. The method includes the steps that S1, a power source framework is analyzed; S2, analog power supply modules are found, wherein the output current of the analog power supply modules is larger than 6A, the switching frequency interval of the analog power supply modules is smaller than 20KHz, one of the analog power supply modules is changed to be a digital power source module or an analog power supply module, and the switching frequency interval of the analog power supply module is larger than 20KHz; S3, a digital power source module with same conditions is searched for; S4, the switching frequency interval of the digital power source module is set to be 20-40KHz; S5, loop parameters are adjusted according to switching frequency changes; S6, the loop parameters are tested, and if noise ripple waves do not meet parameters of communication equipment, the S5 is repeated; if the noise ripple waves meet the parameters of the communication equipment, the S7 is exerted; S7, the loop parameters of the digital power source module are solidified. Under the condition that an existing power source framework is not changed, the method for suppressing the beat frequency noise of the multiple switch power sources reduces beat frequency interference among the switch power sources, ensures the design quality of a system and promotes the quality of high-speed signals.
Description
Technical field
The present invention relates to the Power Management Design field in communication system, is specifically a kind of method that suppresses a plurality of Switching Power Supply beat frequency noises.
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, have brought 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 a plurality of isolation modules, a plurality of non-isolation module and a plurality of linear voltage regulator (LDO1 ... LDO N).Equipment, from the interchange or DC power supply power taking of machine room, through the conversion of insulating power supply module, then is changed by non-insulating power supply module conversion or linear voltage regulator, finally for low-voltage is for device.This power supply structure is supported power supply redundancy protection, and reduction equipment impacts power of computer room, guarantees that faulty equipment and assembly independently exit, and guarantee the normal operation of communication equipment.
Along with High Speed System development, device power supply (DPS) power strengthens, and power type increases, and the requirement of power source performance raising, and the problem that this power supply structure exists manifests gradually:
First, non-insulating power supply is mostly Switching Power Supply, and a plurality of close switching frequencies can cause beat frequency problem.Phenomenon is the most intuitively: when the isolation module of two close switching frequencies is worked simultaneously, often can hear howling; The switching frequency of adjusting an 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 stack of 500kHz switching frequency power supply.
In addition, for whole power supply system, a plurality of non-isolation modules of bus power source carrying, are used to provide multiple low-voltage dc power supply.A plurality of non-isolation modules produce ripple reflected current in its input port, and ripple is superimposed upon input power bus, and are mutually conducted and crosstalk between non-isolation module by bus, have influence on the output of various low-tension supplies.Experiment shows, so long as a plurality of non-isolation module works simultaneously, all can be by conducting beat frequency noise in bus, and if enough anti-noise ability large or chip is poor for noise power, beat frequency noise produces many-sided impact and is difficult for discovering circuit.Power supply beat frequency noise is as follows for the major effect of communication system:
1) affect system clock quality: clock spectrum is not dull, in links such as clock are comprehensive, introduce noise, cause signal jitter excessive.
2) high speed signal quality: cause high speed signal error code, power supply beat frequency noise directly has influence on the normal operation 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 existing in prior art, the object of the present invention is to provide a kind of method that suppresses a plurality of Switching Power Supply beat frequency noises, do not changing under existing power supply framework condition, the beat frequency reducing between Switching Power Supply disturbs, guarantee 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 that suppresses a plurality of Switching Power Supply beat frequency noises, comprise the steps: the power module framework of S1. analyzing communication equipment, and power module comprises analog power module and digital power module; S2. within the scope of analog power module, find out output current and be greater than the analog power module that 6A, switching frequency interval are less than 20KHz, one of them analog power module is changed to digital power module, or change to the analog power module that the switching frequency interval making between power module is greater than 20KHz; S3. within the scope of digital power module, find out output current and be greater than the digital power module that 6A, switching frequency interval are less than 20KHz; S4. the power module of finding out according to S2 and S3, arranges the switching frequency of these digital power modules, makes the switching frequency between power module be spaced apart 20KHz～40KHz; S5. according to the switching frequency adjustment loop parameter after arranging, guarantee loop stability; S6. test the loop parameter after each switch of the power supply module set of frequency, if when noise ripple does not meet communication equipment parameter, proceed to S5; If meet communication equipment parameter, enter S7; S7. solidify the loop parameter of described digital power module, deposit the program storage chip of digital power in.
On the basis of technique scheme, described analog power module mostly is two most, and during two analog power modules, must have the switching frequency of an analog power module 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 of output current 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, the output voltage of digital power module, switching frequency and loop parameter are deposited in to the program storage chip of digital power module.
Beneficial effect of the present invention is: by the switching frequency of power module is set, as use 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), can effectively 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 a plurality of Switching Power Supply beat frequency noises;
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 a plurality of Switching Power Supply beat frequency noises, 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.Applicable scope is: the quantity of analog power module mostly is two most, and switching frequency interval is less than 20KHz, when having two analog power modules, must have the switching frequency of an analog power module adjustable.Because during the switching frequency intermodulation of power module of the same race, its operating frequency is more not approaching, 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, in the situation that not increasing design cost, utilizes wrong frequency method, can reduce the beat frequency noise of switching frequency.
As shown in Figure 2, the present invention suppresses the method for a plurality of Switching Power Supply beat frequency noises, and detailed step is as follows:
S1. the power module framework of analyzing communication equipment, determines and uses the implementation of power module and switching frequency, output current size.
S2. within the scope of analog power module, find out output current and be greater than the analog power module that 6A, switching frequency interval are less than 20KHz, one of them analog power module is changed to digital power module, or change to the analog power module that the switching frequency interval making between power module is greater than 20KHz.
S3. within the scope of digital power module, find out output current and be greater than the digital power module that 6A, switching frequency interval are less than 20KHz.The available PMBUS bus of digital power module, and can be used to dynamically arrange digital module parameter, comprise the functions such as switching frequency that regulate digital power module.
S4. the power module of finding out according to S2 and S3, arranges the switching frequency of these power modules, and the switching frequency of digital power module is set, and makes 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, the switching frequency of this power module and other power module is set to 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, guarantees loop stability.
S6. test the loop parameter after each switch of the power supply module set of frequency, as shown in Figure 3, the output of the power supply of power module 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 while 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 when if noise ripple does not meet in communication equipment parameter, 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, the output voltage of digital power module, switching frequency and loop parameter are deposited in to the program storage chip of digital power module.When digital power module starts, guarantee normal initialization and the program operation of digital power.
The present invention is not limited to above-mentioned execution mode, for those skilled in the art, under the premise without departing from the principles of the invention, can also make some improvements and modifications, within these improvements and modifications are also considered as protection scope of the present invention.The content not being described in detail in this specification belongs to the known prior art of professional and technical personnel in the field.
Claims (5)
1. suppress a method for a plurality of Switching Power Supply beat frequency noises, 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;
S2. within the scope of analog power module, find out output current and be greater than the analog power module that 6A, switching frequency interval are less than 20KHz, one of them analog power module is changed to digital power module, or change to the analog power module that the switching frequency interval making between power module is greater than 20KHz;
S3. within the scope of digital power module, find out output current and be greater than the digital power module that 6A, switching frequency interval are less than 20KHz;
S4. the power module of finding out according to S2 and S3, arranges the switching frequency of these digital power modules, makes the switching frequency between power module be spaced apart 20KHz～40KHz;
S5. according to the switching frequency adjustment loop parameter after arranging, guarantee loop stability;
S6. test the loop parameter after each switch of the power supply module set of frequency, if when noise ripple does not meet communication equipment parameter, proceed to S5; If meet communication equipment parameter, enter S7;
S7. solidify the loop parameter of described digital power module, deposit the program storage chip of digital power in.
2. the method for a plurality of Switching Power Supply beat frequency noises of inhibition as claimed in claim 1, is characterized in that: described analog power module mostly is two most, and during two analog power modules, must have the switching frequency of an analog power module adjustable.
3. the method for a plurality of Switching Power Supply beat frequency noises of inhibition 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 power module of output current maximum, the switching frequency of itself and other power module is set to and is greater than 30KHz.
4. the method for a plurality of Switching Power Supply beat frequency noises of inhibition 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.
5. the method for a plurality of Switching Power Supply beat frequency noises of inhibition as claimed in claim 1, it is characterized in that: in described S7, utilize the PMBUS bus of digital power, the output voltage of digital power module, switching frequency and loop parameter are deposited in to the program storage chip of digital power module.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN111600367A (en) * | 2020-05-09 | 2020-08-28 | 华为技术有限公司 | Transmission frequency control method and device in wireless charging and related equipment |
| CN112803738A (en) * | 2021-01-04 | 2021-05-14 | 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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| JPS56169987A (en) * | 1980-06-03 | 1981-12-26 | Nec Corp | Multioutput switching power supply circuit |
| 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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2013
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| JPS56169987A (en) * | 1980-06-03 | 1981-12-26 | Nec Corp | Multioutput switching power supply circuit |
| 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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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN111600367A (en) * | 2020-05-09 | 2020-08-28 | 华为技术有限公司 | Transmission frequency control method and device in wireless charging and related equipment |
| 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 |
| CN112803738A (en) * | 2021-01-04 | 2021-05-14 | 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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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. |