CN104181820B - A kind of Power Management Design method based on frequency-domain analysis - Google Patents
A kind of Power Management Design method based on frequency-domain analysis Download PDFInfo
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- CN104181820B CN104181820B CN201410386810.5A CN201410386810A CN104181820B CN 104181820 B CN104181820 B CN 104181820B CN 201410386810 A CN201410386810 A CN 201410386810A CN 104181820 B CN104181820 B CN 104181820B
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Abstract
A kind of Power Management Design method based on frequency-domain analysis, it comprises the following steps：The first step, the open-loop transfer function of test platform is measured in the assessment of test platform, and determines design object；Second step, test target is loaded into, compensating parameter is drawn according to test parameter, and draw the Bode diagram of compensating parameter；Then the Bode diagram of compensating parameter and the superposition of the Bode diagram of open-loop transfer function are drawn into closed loop curve；3rd step, the parameter of alignment error amplifier, Selecting All Parameters value, and described Selecting All Parameters value is debugged in the wiring board of concrete application, draw the Bode diagram response curve in whole loop；4th step, test result confirms, obtains the Bode diagram of the closed loop on the test platform, the Bode diagram of the closed loop on test platform is contrasted with computer simulation chart, to confirm whether the two coincide.Present invention substantially reduces the design cycle, the quality of product is improved, improves efficiency of research and development.
Description
Technical field
The present invention relates to Power Management Design field, more particularly to a kind of Power Management Design method based on frequency-domain analysis.
Background technology
With Theory of Automatic Control application it is increasingly mature, Automatic Control Theory is also more and more applied to power supply
Among the integrated circuits such as IC, this causes Switching Power Supply to be ensured in terms of stability.Although in the market has occurred interior
The power supply IC products of portion's compensation, but the degree of popularization is also not reaching to, and also price is costly, therefore in the market is much electric
Source IC is also using the mode of external compensation circuit.The power supply IC of external compensation circuit regulation presence, illustrates considering
In the case of cost performance, or with many advantages, so the power source design of main flow is still using external compensation now
Mode.It is a concern that after by carrying out network analysis to many power supply products of in the market, discovery has many existence and stabilities
It is bad, poor performance, the problems such as efficiency is low.So, power generation project efficiency can be improved by finding one kind, strengthen power supply stability control
System, the visualization Power Management Design method of power supply power consumption is reduced, just into vast Power Engineer urgent problem to be solved.In the past,
Engineer be all by many years of experience of oneself come regulation power supply compensating parameter, and often adjust get up time-consuming, efficiency is low, most
The result obtained afterwards also not necessarily meets the requirement of volume production with regard to that can reach, once arrived the volume production stage, some hide the problem of put
It will be displayed after big.For example, cross-over frequency point it is too low it is too high caused by system instability problem, thermal losses is serious to ask
Topic, efficiency is low, low-response, phase waveform overshoots, and ripple is big.
Traditional Power Management Design method is generally according to following analysis process：
The first step, adjuster open loop pass letter module：
Refering to accompanying drawing 1, it is circuit theory diagrams, in fig. 1, is divided into two modules：Adjuster and compensator.
Adjustor module belongs to executing agency, and its operation principle is：The output of the error amplifier of compensation is as the same of PWM comparators
The input signal of phase input exports the PWM waveform of certain frequency to be compared with OSC.Have one in the bode figures of adjuster
Individual very crucial parameter point, duopole.Duopole is according to output filter circuit：Lout and Cout size determines.Root
According to formula：
It can be seen that increase sensibility reciprocal and output capacitance can all increase our f from formulaLC.Because we are choosing first
When dead-center position, Z1=0.25*f can be probably allowedLC；We improve fLCFrequency just indirectly improve Z1 frequency.
We also have another formula to be：Fc*fc=Z1*P1；It can be seen that raising Z1 can in the case where P1 is determined from formula
To improve fc, that is, our cross-over frequency point is improved, here it is why we will choose as far as possible big fLCFrequency point
Reason.The point that P1 is not to determine, P1 are the parameters relevant with error amplifier compensation, and P1 selection has the upper limit, excessive
P1 can make compensation unstable.fLCThe standard of a recommendation is had according to the design guide of load.
Second crucial point is exactly ESR points in the regulators, and this point is the separation of a slope variation.From fLCArrive
This sections of ESR is the rate of decay according to the octaves of -40db/ ten.Become the octaves of -20db/ ten after ESR, therefore, we select
To be more than ESR points as far as possible when cross-over frequency point, if less than ESR points, then it is difficult regulation that compensation, which is,.
According to formula：
Wherein ESR is bulk electric capacity equivalent resistance in parallel, 5m Ω；ESR determines the stable case of system；It is essentially
It is the smaller the better；FESR is the dead-center position of adjuster corresponding on bode figures, and ESR is smaller, fESRIt is bigger, be so advantageous to carry
High cross-over frequency.
Second step, the regulation of error amplifier compensation loop：
It is understood that compensation path is both the feedback path of system.The key link of compensation is exactly error amplifier, error
Amplifier is divided into two classes：Error amplifier and trsanscondutance amplifier.Also there are two kinds of conventional compensation ways simultaneously：Two classes compensate and three
Class compensates.
Some key parameters and concept of two classes compensation：Mid_band_gain；GM；Z1；P1；
According to formula：
We can see that Mid_band_gain is that have direct relation with R1.GM represents mutual conductance；This from
What datasheet can be looked for arrives.Mid_band_gain be then adjuster it is desirable that cross-over frequency point magnitude margin difference
Value.By this formula, we mainly will calculate R1.R2 and R3 resistance substantially determines that, is given according to IC manufacturers
Resistance span is substantially：Between 1K to 10K.Mid_band_gain formula from the point of view of turning one's head, the value that R1 chooses are big by one
Point, then cross-over frequency point gain just it is big a bit, that is to say, that we, which improve R1 and just represent have selected, bigger passes through frequency
Rate point.
According to formula：
Illustratively, how the parameter of the first limit and the first zero selects.According to the situation of mistake described above,
One limit is the f of a quarterLC, and R1 we just calculate, then, C1 is exactly can be by being calculated.Need
It is pointed out that FP1 can be typically selected in 0.5 times of position of switching frequency.C1 brings this formula of FP1 into after calculating, then C2
Also just calculate.
Some key parameters and concept of three classes compensation：Z2；P2；
According to universal law, we can be chosen at Z2 position between Z1 and the duopole of adjuster.The position that P2 chooses
It is set to：Between the position of duopole and ESR points position.Pass through formula：
3rd step, the regulation of Loop loop modules：
Circuit theory diagrams illustrate that the module is to be overlapped by adjuster and error amplifier and caused.In reality
The parameter for needing us to pay close attention in has the size of cross-over frequency point, the phase margin of cross-over frequency point, cross-over frequency point
Slope.
The size of cross-over frequency point should meet the requirement of load bandwidth, and the phase margin of cross-over frequency point should reach 60
Degree, the slope of cross-over frequency point should be maintained at octaves of -20db/ ten or so；
4th step, the analysis of Phase allowance principles：
Circuit theory diagrams illustrate that, refering to accompanying drawing 2, analysis before is the analysis for being directed to gain in bode curves, we
A limit can be produced by both knowing about integral element, will produce the phase effects of hysteresis；Differentiation element can increase a zero point,
Have the effect of leading phase.Find out from accompanying drawing 2, R3 and C2 constitute an integrating circuit, and C2 just generates a hysteresis
Phase.Then structure one into a differential circuit, generates a zero point to R1 and C1, phase margin that can be advanced.
The content of the invention
The technical problem to be solved in the present invention is to overcome above-mentioned the shortcomings of the prior art, and proposes based on frequency domain point
The Power Management Design method of analysis, shortens the R＆D cycle of Power Management Design, while improves the stability of power supply.
In order to solve the above technical problems, the present invention adopts the following technical scheme that：
A kind of Power Management Design method based on frequency-domain analysis, it comprises the following steps：
The first step, the open-loop transfer function of test platform is measured in the assessment of test platform, and determines design object；
Second step, test target is loaded into, compensating parameter is drawn according to test parameter, and draw the Bode diagram of compensating parameter；
Then the Bode diagram of compensating parameter and the superposition of the Bode diagram of open-loop transfer function are drawn into closed loop curve；
3rd step, the parameter of alignment error amplifier, Selecting All Parameters value, and by described Selecting All Parameters value in concrete application
Wiring board in debugged, draw the Bode diagram response curve in whole loop；
4th step, test result confirm, obtain the Bode diagram of the closed loop on the test platform, will be described flat in test
The Bode diagram of closed loop on platform is contrasted with computer simulation chart, to confirm whether the two coincide.
Preferably, the design object that the described first step determines is obtained by the dynamic response of test load.
Preferably, the described first step determines also to include after design object, determines cross-over frequency step and determines gain
Compensation process, finally confirm compensation type.
Wherein, described second step also includes, and a round and smooth processing step, the theoretical value of compensating parameter is more nearly reality
Value.
Wherein, the 3rd described step also includes, and a system timely responds to the confirmation of condition.
Wherein, the step of batch production is also included after the 4th described step.
Preferably, the Bode diagram drawn in the second step is using computer drawing.
Preferably, the superposition that the open loop in described second step passes the Bode diagram of letter and the Bode diagram of compensating parameter is to pass through
What computer was completed.
Preferably, the closed loop Bode diagram on test platform in the 4th step is plotted in same with computer simulation chart
In width figure.
Preferably, the parameter of described round and smooth processing is resistance value and capacitance.
Compared with prior art, the present invention has the advantages that, the Power Management Design side of the invention based on frequency-domain analysis
Method can be understood the stability of power supply characteristic by frequency domain angle whereby by testing frequency domain characteristic；Research and development and proving time are saved,
Meet multi-size of the client to power supply, and the requirement that delivery time-histories is short；Checking product has enough phases whereby
Position allowance, is unlikely to have unstable situation because of part difference during volume production.
Brief description of the drawings
Fig. 1 designed for conventional power source in frequently with power supply loop circuit theory diagrams；
Fig. 2 designed for conventional power source in frequently with two class compensation circuit schematic diagrams；
The flow chart of Power Management Design method during Fig. 3 designs for conventional power source；
Fig. 4 is the design flow diagram of the Power Management Design method of the invention based on frequency-domain analysis.
Embodiment
Embodying the exemplary embodiment of feature of present invention and advantage will describe in detail in the following description.It should be understood that
The present invention can have various changes in different embodiments, and it is neither departed from the scope of the present invention, and theory therein
Bright and diagram is treated as purposes of discussion in itself, and is not used to the limitation present invention.
Refering to accompanying drawing 2, the Power Management Design method of the invention based on frequency-domain analysis comprises the following steps：
The assessment of test platform：
First, we will measure the open-loop transfer function of platform, by choosing suitable insertion electricity in test platform
Both ends injection swept-frequency signal is hindered, the Byrd of our conceivable platform open-loop transfer functions can be measured out in position
Figure.Our design object is primarily determined that, design object includes, the power supply requirement of load end, for example, the selection of inductance sensibility reciprocal,
The size of load current, the ripple requirement of load, the dynamic response requirement of load, suitable power switch frequency.Pass through Byrd
Scheme and then determine the design of our compensation loop.By observing simulation result, the open-loop transfer function of platform is determined
Bode diagram, and determine to compensate type：
In the present embodiment, our design object of we can be quickly determination, the dynamic response loaded according to us
Demand, we will be travelling through Frequency point and are designed as 30KHz；By slide bar it is understood that we are needed in gain at this point
Upper compensation 17.51dB in phase, it is necessary to compensate 105.8 degree；And we have observed that his cross-over frequency point position is oblique
Rate is decayed with -1 speed, thus compensate type we can select 2 classes compensate.According to compensation type, followed by really
Volume zero pole point position needed for us is determined to calculate specific compensating electric capacity resistance value.
By surveying the observation of bode figures to more than, we just can intuitively determine that our design object and design will very much
Ask, this has accomplished the assurance comprehensive and accurate to design object in principle, and let us is avoided to design initial stage in design
The indefinite problem of object.This reduces the probability slipped up in design, and the complexity of design process is reduced, improved
Designing quality.
Second step, design object is loaded into, determines compensating parameter, and draw the Bode diagram of compensating parameter：
Analyzed by the open loop condition of appeal, we open our software systems and input our design requirement one by one
To among computer, computer can voluntarily calculate the compensating parameter of our needs, while draw out the Bode diagram of compensation.
Preferably, these theoretical values calculated are not arriving of being fully able to look for, and therefore, we will pass through round and smooth place
Reason, so-called annulus processing here refer to some the resistance capacitance value criteria of right and wrong devices come out when our theoretical calculations when
Wait, we can select close resistance capacitance value, and this process can be completed by computer software itself.The effect reached is exactly to be
Avoid customizing some nonstandard capacitance resistance values, avoid increasing cost, finally allow it actually to obtain electricity close to us
Hold resistance value.
After obtaining the compensation bode curve maps that we want, by Superposition Formula by open loop Bode diagram and compensation Byrd
Figure is overlapped, and will obtain our last emulation closed loop curve.
3rd step, alignment error amplifier parameter：
Estimated by the theoretical value for calculating software, then be replaced by choosing accepted value, these are replaced
Value is debugged onto the plank of reality, and actual plank just refers to above-mentioned test platform.Here accepted value：Refer to above-mentioned mark
Pseudo-capacitance resistance value, remeasuring the bode response curves of whole loop.
In the present embodiment, by emulating stacking chart, it will be seen that the cross-over frequency point set before us is
30KHz, the cross-over frequency point of our emulation superposition is 29.45KHz, very close to our theoretical value, phase margin 51.04
Deg, this achieve the condition that system timely responds to.
4th step, design result is confirmed, by simulation result and actual test Comparative result：
First, the bode figures of actual measurement closed loop：
By observation, the result calculated according to computer is passed through into electricity to adjust the test result of test platform with us
Brain simulation result is compared, and sees whether simulation result and platform test result coincide, if coincideing, illustrates the technology of the emulation
Parameter meets the needs of power supply；If misfitting, be further finely adjusted, design method simulation result of the invention substantially with
Actual platform design parameter demand is coincide, and is met the requirements, and greatly reduces the design cycle, and efficiency significantly improves.
5th step, carry out the batch production of power supply：
Our assessments last to test platform and confirm it is errorless after, the batch production that can be trusted.It is whole to adjust
Examination process, 3 to 4 times of debug time is saved than traditional Power Management Design flow, and obtained final result and expection
As a result can be good at coincideing, this also enhances the competitiveness of company commercially while design efficiency is improved, and shortens
Product enters the time in market, improves the life cycle of product.
A kind of Power Management Design method based on frequency-domain analysis of the present invention, has an advantageous effect in that：Research and develop/verify engineering
Teacher only needs source and load to test time domain specification, can understand the stability of power supply characteristic by frequency domain angle whereby；Save
Research and development/proving time, meet multi-size of the client to power supply, and the requirement that delivery time-histories is short；Verify whereby
Product has enough phase margins, is unlikely to have unstable situation because of part difference during volume production；Frequency domain is provided to ring
Analysis chart is answered, trust of the client to designed capacity can be strengthened, lifts the image of company.
It should be noted that these are only the preferable possible embodiments of the present invention, not limit the scope of the invention,
All equivalent structures with made by description of the invention and accompanying drawing content change, and are all contained in protection scope of the present invention.
Claims (5)
- A kind of 1. Power Management Design method based on frequency-domain analysis, it is characterised in that comprise the following steps：The first step, the open-loop transfer function of test platform is measured in the assessment of test platform, and determines design object；Second step, test target is loaded into, compensating parameter is drawn according to test parameter, and draw the Bode diagram of compensating parameter；Then The Bode diagram of compensating parameter and the superposition of the Bode diagram of open-loop transfer function are drawn into closed loop curve, and carry out round and smooth processing, makes benefit The theoretical value for repaying parameter is more nearly actual value, and the parameter of described round and smooth processing is resistance value and capacitance；3rd step, the parameter of alignment error amplifier, Selecting All Parameters value, and by described Selecting All Parameters value concrete application line Debugged in the plate of road, draw the Bode diagram response curve in whole loop, and the confirmation of condition is timely responded to system；4th step, test result confirm, obtain the Bode diagram of the closed loop on the test platform, will be described on test platform The Bode diagram of closed loop contrasted with computer simulation chart, to confirm whether the two coincide, wherein, the described first step determines Design object obtained by the dynamic response of test load, the described first step determines also to include after design object, it is determined that Cross-over frequency step and determination gain compensation step, finally confirm compensation type.
- 2. the Power Management Design method based on frequency-domain analysis as claimed in claim 1, it is characterised in that after the 4th described step The step of also including batch production.
- 3. the Power Management Design method based on frequency-domain analysis as claimed in claim 1, it is characterised in that drawn in the second step Bode diagram using computer drawing.
- 4. the Power Management Design method based on frequency-domain analysis as claimed in claim 1, it is characterised in that in described second step The superposition that open loop passes the Bode diagram of letter and the Bode diagram of compensating parameter is completed by computer.
- 5. the Power Management Design method based on frequency-domain analysis as claimed in claim 1, it is characterised in that in the 4th step Closed loop Bode diagram on test platform is plotted in same width figure with computer simulation chart.
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| JP7070044B2 (en) * | 2018-04-26 | 2022-05-18 | トヨタ自動車株式会社 | Battery information processing system, battery module full charge capacity calculation method, battery module internal resistance calculation method, and battery assembly manufacturing method |
| CN112859640B (en) * | 2020-12-31 | 2024-02-23 | 深圳市雷赛软件技术有限公司 | Method and device for debugging corrector parameter of drive and readable storage medium |
| CN116930808B (en) * | 2023-06-26 | 2024-01-23 | 广州致远仪器有限公司 | Stability testing method, device and equipment for power loop and storage medium |
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| US7129800B2 (en) * | 2004-02-04 | 2006-10-31 | Sun Microsystems, Inc. | Compensation technique to mitigate aging effects in integrated circuit components |
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| US7162655B2 (en) * | 2003-07-16 | 2007-01-09 | Dell Products, L.P. | Method and system for information handling system power control |
| CN1759525A (en) * | 2004-02-03 | 2006-04-12 | 株式会社村田制作所 | Switching power supply device |
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