CN101286702B - Adaptive digital DC/DC control method and converter with fast dynamic response - Google Patents
Adaptive digital DC/DC control method and converter with fast dynamic response Download PDFInfo
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Abstract
The invention relates to a self-adaptive digital DC/DC control method which has fast dynamic response and a converter. The self-adaptive control method related by the invention is implemented in a secondary side controller. In the control method, error detected is positive (negative) when sag (uprush) happens to an output voltage, and a first PID with good steady-state characteristics is switched to a second PID with good dynamic characteristics when the absolute value of the error exceeds a preset threshold value, the output voltage begins to enter a steady state when the error turns to be negative (positive), and the second PID is switched to the first PID when alternative changes between positive and negative errors are continuously detected, for which a steady state is deemed to be realized. The circuit structure of the DC/DC converter comprises a main power topology, an isolating transformer, a primary side controller, the secondary side controller, a driving circuit, a voltage and current detecting channel, a feedback and sampling channel, a primary side assisting source, a secondary side assisting source, a parameter memorizer and a communication interface. The control method of the invention has reasonable design and the converter is simple and practical.
Description
Technical field
The present invention relates to the digital DC/DC converter and the control technology thereof of multichannel output, be specifically related to a kind of digital DC/DC converter and control method thereof that has the adaptively changing control algolithm, improves the output voltage dynamic responding speed.
Background technology
The DC/DC converter is generally the terminal power supply of all kinds of power consumption equipments, thus its dynamically and stable state directly have influence on the operating state of load.The dynamic response of system and steady-state characteristic are mutual contradiction.The dynamic responding speed of system is fast more, and the adaptability that load or input are changed is strong, and this moment, the error originated from input of adjuster was big, and regulating effect is fast, but system overshoot causes system oscillation when excessive easily, and steady-state characteristic is relatively poor; Otherwise its dynamic response of system that steady-state behaviour is good more often is difficult to meet the demands.
The hardware circuit that analog controller adopts discrete component to form is realized the compensation to system, and components and parts are subjected to the influence of temperature, humidity, factor such as aging, and its parameter can be drifted about, and causes the control characteristic variation or the inefficacy of system.In high-performance DC/DC converter controller design, output voltage not only wants stability height, output noise little, and enough fast load response and input voltage responding ability must be arranged, the satisfaction of each performance index of consideration of trading off usually in the design.Realize that a plurality of analog controllers need a plurality of hardware compensating networks, complex circuit designs, and can't realize adaptive control.
Digital controller is to realize compensation effect to system with software, and its design is not subjected to the influence of external hardware, and the control algolithm that realization able to programme is new or the combination of a plurality of control algolithms, design are freely, flexibility is bigger.Because power supply in most of the cases all operates in stable state, its steady-state error is slightly vibration near zero point, at first satisfies the steady-state behaviour index of DC/DC converter when CONTROLLER DESIGN; When power initiation or generation load changing or input sudden change, the error amplitude of output voltage also can be undergone mutation, the controlled quentity controlled variable that must increase controller output this moment fast just can reach the requirement of dynamic property, and traditional PID controller (Proportional Integrative Derivative, proportional-integral-differential) is difficult to satisfy simultaneously the requirement of two aspects.
The DC/DC converter usually adopts the mode by week control, according to new duty ratio of Error Calculation of output voltage, and outputs to the hardware actuator and compensates in each switch periods.Available technology adopting speed-up computation method also can reach the purpose that improves dynamic responding speed, but has certain limitation.The mentality of designing that monocycle repeatedly calculates is, the requirement of stable state index is at first satisfied in the design of controller parameter, when detected error amount surpasses the maximum of setting, in each switch periods same error is carried out the inferior calculating of N (N＞1), and the value of the controlled quentity controlled variable that will calculate for the last time (duty ratio) is exported to hardware, intermediate object program is not exported, only as the iterative value of calculating next time; Each switch periods only reverts to and calculates once when error amount falls back to the minimum value of setting.In traditional pid algorithm implementation, if the output controlled quentity controlled variable of pid control algorithm increases, then error amount will reduce gradually, system moves closer to poised state, if error remains unchanged in repeatedly calculating, then controlled quentity controlled variable can build up increase, so be equivalent to accelerate the governing speed of controller.
Accelerating algorithm exists certain restriction condition and shortcoming in application in sum, mainly shows:
One, only suitable operation to single error promptly suppresses the upper punch amplitude or the sagging amplitude of output voltage, and can not suppress the overshoot of both direction simultaneously; When carrying out upper punch simultaneously and dashing processing down, there is the overlapping region in the threshold value of error, can cause upper punch, sagging circulation to take place, and the output generation is vibrated.
Two, suppress upper punch (or sinking) and recoil and always condition each other, contradiction mutually, the threshold setting of Error Absolute Value more little, good more to the inhibition effect of upper punch (or sinking), still the reverse surge voltage that causes is also big more.
Adopt the load switching of traditional single calculation pid algorithm (to load on 10%I
oAnd 50%I
oBetween circulation switch I
oOutput current during for nominal load) voltage waveform is shown in Figure of description 1, the voltage waveform that adopts load switching when quickening pid algorithm is shown in Figure of description 2, as can be seen from Fig. 2, though the sagging amplitude to output voltage is inhibited, repeatedly the calculation times reverse voltage that can cause impacts.
Summary of the invention
In order to solve upper punch amplitude or the sagging amplitude that the described accelerating algorithm that exists in the prior art can only suppress output voltage, and can not suppress the overshoot of both direction simultaneously; When carrying out upper punch simultaneously and dashing processing down, there is the overlapping region in the threshold value of error, can cause upper punch, sagging circulation to take place, and the output generation is vibrated; Always condition each other because suppress upper punch (or sinking) and recoil again, mutual contradiction, the threshold setting of Error Absolute Value more little, inhibition effect to upper punch (or sinking) is good more, but technical problems such as the reverse surge voltage that causes is also big more the invention provides a kind of adaptive digital DC/DC control method with fast dynamic response.
The present invention also provides a kind of adaptive digital DC/DC converter with fast dynamic response.
The present invention solves technical scheme that the prior art problem adopted for a kind of adaptive digital DC/DC control method with fast dynamic response is provided, described adaptive digital DC/DC control method is for sink (upper punch) occurring when output voltage, detect error for just (bearing), when the absolute value of error surpasses preset threshold, switch to the second good proportional-integral derivative controller of dynamic characteristic (the 2nd PID Proportional Integrative Derivative) by the first good proportional-integral derivative controller of steady-state characteristic (a PID Proportional Integrative Derivative), when error becomes negative (just), output voltage begins to enter stable state, just be consecutively detected error, think when bearing alternate to reach stable state, then switch to described first proportional-integral derivative controller by described second proportional-integral derivative controller.
According to a preferred embodiment of the invention: described adaptive digital DC/DC control method specifically comprises step: one goes on foot, reads in the initial value of control algolithm; Two go on foot, current voltage are sampled, and deduct sampled value with default internal reference, obtain error current; If three step errors surpass preset threshold, the parameter switching mark puts 1, otherwise remains 0 (initial value of parameter switching mark is 0), and chooses proportional-integral derivative controller according to the parameter switching mark; The duty ratio of four steps, calculating current period; Five steps, judge whether described duty ratio is saturated, as take place saturatedly, move back saturated processing, otherwise maintenance result of calculation is constant; Six steps, with the error amount of the result of calculation of current period, current period and the error in previous cycle initial value as next cycle, upgrade the initial value of described duty ratio and error; If seven step parameter switching mark are 0, skip this step and carry out a described step, otherwise judged whether the symbol of described error current and the error of last one-period be reverse, write down the positive and negative number of times that replaces of described error, if the positive and negative alternate frequency of described error reaches predetermined value, think that output has reached stable state, the parameter switching mark is put 0, upgrade described parameter switching mark; Eight go on foot, carry out a described step once more, carry out the circulation in next cycle.
According to a preferred embodiment of the invention: described step 1 is specially: the initial value that reads in control algolithm, if be just to start, then the initial value of duty ratio and error is zero, otherwise, duty ratio is the calculated value of preceding two switch periods, and error is the sampled value of preceding two switch periods.
According to a preferred embodiment of the invention: described step 3 is specially: if the parameter switching mark is 1, then switch to good described second proportional-integral derivative controller of dynamic characteristic, and to get described second proportional-integral derivative controller be current controller parameter, and the first good proportional-integral derivative controller is current controller parameter otherwise get described steady-state characteristic.
According to a preferred embodiment of the invention: the duty ratio calculation method that calculates current period in the described step 4 is: u (n)=a
11* u (n-1)+a
12* u (n-2)+b
10* e (n)-b
11* e (n-1)+b
12* e (n-2), in the formula: u (n) is current period dutyfactor value, u (n-1) for one-period dutyfactor value forward, u (n-2) are the dutyfactor value in two cycles forward, and e (n) be that the error amount, e (n-1) of current period is the error amount in two cycles forward for error amount, the e (n-2) of one-period forward; a
11, a
12, b
10, b
11And b
12Be and the relevant coefficient of proportional-integral derivative controller (PID controller).
According to a preferred embodiment of the invention: move back saturated processing described in the described step 5 and be specially: if the calculated value of current duty ratio is greater than 1, the initial value of then output duty cycle amplitude limit to 1, and duty ratio all puts 1, the whole zero clearings of the initial value of error; If the calculated value of current duty ratio is less than 0, the whole zero clearings of the initial value of then output duty cycle amplitude limit to 0, and duty ratio and error.
According to a preferred embodiment of the invention: the method for upgrading the initial value of described duty ratio and described error in the described step 6 is the error amount of result of calculation, current period with current period and the error in the previous cycle initial value as next cycle, upgrades the initial value of described duty ratio and error.
The present invention also provides a kind of adaptive digital DC/DC converter with fast dynamic response, described DC/DC converter comprises: main power topology, isolate the transformation operate portions, the first Control work portion, the second Control work portion, drive circuit works portion, voltage and current detecting operate portions and feedback and sampling work portion, wherein, the described first Control work portion is connected with described isolation transformation operate portions, described isolation transformation operate portions is connected with described main power topology operate portions, described main power topology operate portions is connected with described voltage and current detecting operate portions, described voltage and current detecting operate portions are connected with described feedback and sampling work portion, described feedback and sampling work portion are connected with the described second Control work portion, and described drive circuit works portion is connected with the described second Control work portion with described main power topology operate portions respectively.
According to a preferred embodiment of the invention: described DC/DC converter also comprises: be used to first power supply of described first Control work portion power supply, second source, parameter storage and the communication interface that is used to the described second Control work portion to power, wherein said first power supply is connected with the described first Control work portion, described second source is connected with the described second Control work portion, and described parameter storage is connected with the described second Control work portion respectively with described communication interface.
According to a preferred embodiment of the invention: the described first Control work portion is a former limit controller, and described former limit controller carries out Digital Control by fpga chip, and its operating frequency is 83MHz, and output duty cycle is a fixed value 45%, and frequency is 325kHz.The described second Control work portion is the secondary controller, and described secondary controller carries out Digital Control and management by fpga chip, and its operating frequency is 80MHz, and output duty cycle is the result of calculation of closed loop algorithm, and frequency is 312kHz.
Beneficial effect of the present invention is: the present invention adopts the hardware configuration of even numbers word controller, no optocoupler, has realized the DC/DC converter of the multichannel output of isolation; And adopt the method that the different parameter adaptive of many group performance emphasis switches to improve its dynamic responding speed.The implementation basis of the control algolithm that is adopted is that the Error Absolute Value of controlled volume exceeds set point, the adaptive digital DC/DC control method that adopts the present invention to have fast dynamic response both can guarantee steady-state behaviour, had also well satisfied the requirement of dynamic responding speed and regulating effect simultaneously.
Description of drawings
Fig. 1. the voltage waveform view of pid algorithm when load is switched in the prior art;
Fig. 2. the reverse surge voltage waveform schematic diagram that the PID accelerating algorithm causes in the prior art;
Fig. 3. the present invention has adaptive digital DC/DC converter module structural representation in the adaptive digital DC/DC control method of fast dynamic response and the converter;
Fig. 4 the present invention has the implementation process schematic diagram of two groups of parameter method for handover control in the adaptive digital DC/DC control method of fast dynamic response and the converter;
Fig. 5. the voltage sag waveform schematic diagram when adopting two groups of parameter adaptives to switch;
Fig. 6. the voltage upper punch waveform schematic diagram when adopting two groups of parameter adaptives to switch.
Embodiment:
The invention will be further described below in conjunction with accompanying drawing:
Self-adaptation control method related among the present invention is implemented in the secondary controller.
See also the implementation process schematic diagram that Fig. 4 the present invention has two groups of parameter method for handover control in the adaptive digital DC/DC control method of fast dynamic response and the converter.As shown in Figure 4, described adaptive digital DC/DC control method specifically comprises step: one goes on foot, reads in the initial value of control algolithm, if converter starts for the first time, all initial values are all got zero and are calculated, otherwise the initial value of duty ratio and error is got previous and preceding two cycle corresponding historical values respectively; Two go on foot, current voltage are sampled, and deduct current sampled value with the output voltage fiducial value of setting in the software, obtain error current; Three the step, according to the currency of error, the parameter switching mark is set, and flag bit is chosen proportional-integral derivative controller thus; Four the step, with all initial value substitution u (n)=a
11* u (n-1)+a
12* u (n-2)+b
10* e (n)-b
11* e (n-1)+b
12Among * the e (n-2), calculate the duty ratio of current period; Five steps, judge whether described duty ratio saturated: as if the calculated value of current duty ratio greater than 1, output duty cycle amplitude limit to 1 then, the initial value of duty ratio all puts 1, the whole zero clearings of the initial value of error; If the calculated value of current duty ratio is less than 0, the whole zero clearings of the initial value of then output duty cycle amplitude limit to 0, and duty ratio and error; Otherwise keep current result of calculation; Six go on foot, upgrade according to the mode of iteration the initial value of described duty ratio and described error; Seven steps, judge whether the symbol of described error is reverse,, when the positive and negative alternate frequency of described error reaches predetermined value, think to export to have reached stable state, upgrade described parameter switching mark if oppositely write down the positive and negative number of times that replaces of described error; Eight the step, carry out described step 1 once more, carry out the circulation in next cycle.
When load was switched, upper punch or sagging amplitude in order to reduce output voltage required system that enough fast dynamic response must be arranged, but often caused system oscillation because of overshoot is excessive.When adopting repeatedly Calculation Method, when influencing load and switching there be the factor of output voltage upper punch or sagging amplitude: (one), the times N of repeatedly calculating: N is big more, and is good more to upper punch or sagging inhibition effect, but the reverse impact that causes is also big more; (2), enter repeatedly the Error Absolute Value of calculating: this value choosing more little, good more to upper punch or sagging inhibition effect, but because to enter the time of repeatedly calculating longer, so the reverse impact that causes is also big more; (3), the parameter of pid control algorithm itself: if the parameter of controller itself is bigger, then the times N of repeatedly calculating is got smaller value and can be reached dynamic requirements, otherwise then needs to increase the value of N.
At the problems referred to above, the invention provides a kind of adaptive digital DC/DC control method, be intended to solve that the PID control technology can't satisfy the stable state of system and the problem that dynamic property requires simultaneously in defective that existing analog power exists and the prior art with fast dynamic response.Ginseng switching principle in a kind of adaptive digital DC/DC control method with fast dynamic response provided by the invention is: when sink (upper punch) appears in output voltage, detect error for just (bearing), when the absolute value of error surpasses preset threshold, switch to the second good proportional-integral derivative controller of dynamic characteristic (the 2nd PID Proportional Integrative Derivative) by the first good proportional-integral derivative controller of steady-state characteristic (a PIDProportional Integrative Derivative), when error becomes negative (just), output voltage begins to enter stable state, just be consecutively detected error, think when bearing alternate to reach stable state, then switch to described first proportional-integral derivative controller by described second proportional-integral derivative controller.Specific implementation process can be consulted accompanying drawing 4 once more.
During the DC/DC power work, adaptive digital DC/DC controller with the state in the circulation execution graph 41 to state 9, beginning in each switch periods, get the hang of 1, read in the initial value of control algolithm, just start if be, then the initial value of duty ratio and error is zero, otherwise duty ratio is the calculated value of preceding two switch periods, and error is the sampled value of preceding two switch periods; State 2 will be sampled to current voltage, obtain error current and get the hang of 3; Get PID according to the parameter switching mark, if the parameter switching mark is 1, getting the hang of 5, to get the 2nd PID controller be current controller parameter, is current controller parameter otherwise get a PID controller, and gets the hang of 6; Go out the duty ratio of current period according to preceding 5 state computation, and get the hang of 7; Judge whether duty ratio is saturated,, move back saturated processing, otherwise keep result of calculation constant, and get the hang of 8 if take place saturatedly; Upgrade the initial value of duty ratio and error, and get the hang of 9; Whether the symbol of error in judgement is reverse, and the positive and negative number of times that replaces of recording error, if the positive and negative alternate frequency of error reaches predetermined value N, thinks that output has reached stable state, the undated parameter switching mark, and get the hang of 1, begin the circulation in next cycle.
When a PID controller switches to the 2nd PID controller, only need the absolute value of error in judgement, but when when the 2nd PID controller switches to a PID controller, if the absolute value of error in judgement then can have influence on the effect of improving of dynamic property only.The bigger error of just (bearing) can appear in output voltage during (or prominent unloading) load because impact, when switching to the 2nd PID controller by a PID controller, the initial value of the 2nd PID controller is got the history value of nearest two switch periods of a PID controller, though the dynamic response of the 2nd PID controller is very fast, but output voltage has delay component in the loop, the absolute value of error amount still can increase several all after dates and just begin to reduce, and this moment the 2nd PID controller algorithm initial value to control effect without any influence, the switching of two controllers is more steady, vibration can not occur.
If when judging that absolute value when error is less than preset threshold, system switches to a PID controller from the 2nd PID controller, because the overshoot of the 2nd PID controller is bigger, if the initial value of a PID controller is got the history value of nearest two switch periods of the 2nd PID controller, the result of calculation that causes a PID controller is easily vibrated between 0 and 1, causes the output voltage vibration.
After adopting the adaptive method for switching of two groups of parameters, the voltage waveform of output when load is switched is shown in Figure of description 5 and Figure of description 6.As can be seen from the figure, adopt method that two groups of parameter adaptives switch to suppress the voltage upper punch of DC/DC converter when load preferably and sink, and two groups of parameters can realize a smooth transition, can not produce reverse surge voltage and vibration.
Specific embodiment: switch dynamic response at-12V one tunnel in 10%～50% load and describe, its steady-state behaviour control algolithm preferably is:
U(n)＝1.051U(n-1)-0.0507U(n-2)+11.61e(n)-21.81e(n-1)+10.24e(n-2)
Dynamically control algolithm is preferably:
U(n)＝U(n-1)+19.84e(n)-36.21e(n-1)+16.53e(n-2)
The principle that two groups of parameters are switched is: following when amplitude surpasses set point 187mV when output voltage, switch to dynamic property parameter preferably, when error becomes negative, think and begin to enter stable state, double think when detecting the positive and negative alternate of error reach stable state, withdraw from fast parameter, switch to steady-state behaviour parameter preferably.
The present invention has adaptive digital DC/DC converter module structural representation in the adaptive digital DC/DC control method of fast dynamic response and the converter, as shown in Figure 3, described adaptive digital DC/DC converter with fast dynamic response comprises: main power topology operate portions, isolate the transformation operate portions, the first Control work portion, the second Control work portion, drive circuit works portion, voltage and current detecting operate portions, feedback and sampling work portion, be used to first power supply of described first Control work portion power supply, be used to the second source of described second Control work portion power supply, parameter storage and communication interface.Wherein, the described first Control work portion is connected with described isolation transformation operate portions, described isolation transformation operate portions is connected with described main power topology operate portions, described main power topology operate portions is connected with described voltage and current detecting operate portions, described voltage and current detecting operate portions are connected with described feedback and sampling work portion, described feedback and sampling work portion are connected with the described second Control work portion, described drive circuit works portion is connected with the described second Control work portion with described main power topology operate portions respectively, described first power supply is connected with the described first Control work portion, described second source is connected with the described second Control work portion, and described parameter storage is connected with the described second Control work portion respectively with described communication interface.
Wherein, described main power topology operate portions is the main body and the hardware foundation of described isolated digital DC/DC power supply, mainly finishes the energy conversion of power supply.
Described isolation transformation operate portions is an isolating transformer, it is the passage of energy delivery, it can make the input of power supply, output isolate mutually, and the operating frequency of described isolating transformer is 325kHz, and the secondary of former limit of described isolating transformer and described isolating transformer is one group of tapped winding of band.
The described first Control work portion is a former limit controller; described former limit controller carries out Digital Control by fpga chip; its operating frequency is 83MHz; output duty cycle is a fixed value 45%; frequency is 325kHz, mainly finishes duty cycle signals output, input voltage and the input current protection control of main switch.
The described second Control work portion is the secondary controller, and described secondary controller carries out Digital Control and management by fpga chip, and its operating frequency is 80MHz, and output duty cycle is the result of calculation of closed loop algorithm, and frequency is 312kHz.Described secondary controller is a master controller, finishes closed-loop control, output voltage and the output current signal sampling and protection control, controller parameter configuration and communication function of multichannel output voltage.
Described drive circuit works portion is the drive circuit of switch mosfet pipe, mainly finish the power amplification of the duty cycle signals of switching tube, comprise that base MOSFET drives and flash MOSFET drives, wherein, described low limit MOSFET drives by chip for driving and realizes, described flash MOSFET drives by chip for driving and isolating transformer and realizes.
Described voltage and current detecting operate portions are voltage and current detecting passage, finish the sampling and the amplification of input voltage, input current, output voltage and output current.
Described feedback and sampling work portion are feedback and sampling channel, comprise multichannel input analog switch, single channel output analog switch and high-speed ADC sampling A, and the sampling rate of described single channel output analog switch and described high-speed ADC is greater than 2MHz.Feedback and sampling channel receive the signal of sense channel, and carry out time sharing sampling, send into the secondary controller.
Described first power supply is former limit accessory power supply in an embodiment of the present invention, and it can be the amplifier power supply of former limit controller, chip for driving and testing circuit.
Described second source is the secondary accessory power supply in an embodiment of the present invention, and it can be the amplifier power supply of secondary controller, chip for driving and testing circuit.
Described communication interface is the UART communication interface, adopts the UART communication protocol of standard, can realize the online modification of power parameter.
Described parameter storage is the eeprom memory chip, can advance to upgrade and preservation to the data that receive from the UART communication interface, and guarantee that isolated digital DC/DC power supply reads in up-to-date parameter when powering at every turn and is configured.
The power supply of described isolated digital DC/DC converter is input as direct current, and the change in voltage scope is between 23V～33V; Described isolated digital DC/DC power supply is output as three road direct currents, voltage is respectively+5V ,+12V and-12V.
Main power topology adopts the push-pull converter structure described in the present invention, and secondary side rectification circuit need not filter inductance, and circuit structure is simple.Former limit controller adopts the mode of soft start to start working during start.In each switch periods, former limit controller respectively detects once input voltage and input current, has judged whether the under-voltage or overcurrent generation of input.Take place when unusual, former limit duty ratio is closed, and output voltage is zero, but former limit controller do not quit work, but each switch periods continues to detect input voltage and electric current, resumes work when abnormal conditions disappear.After the switching tube work of former limit, can set up voltage on the secondary bus, thereby the auxiliary source of secondary and controller are started working.The secondary controller gets electric back and reads the parameter that sets in advance earlier from eeprom memory power supply is configured.After parameter configuration is finished, controller will start the time-delay that powers on that sequential is provided with every road according to output, and adopt the mode of soft start to export successively.Three shared one group of buses of output of secondary, + 5V and+12V output adopts synchronous rectification Buck converter to realize voltage stabilizing,-12V adopts synchronous rectification Buck/Boost converter to realize voltage stabilizing, this design not only can reduce the conduction loss of fly-wheel diode, improve conversion efficiency, and having realized the energy two-way flow of load and bus, the intersection when having reduced the influence of secondary busbar voltage and laod unbalance between each road is regulated.
The method realization voltage stabilizing of univoltage ring by week control all adopted in secondary three tunnel outputs, the output voltage on each road is sampled in one-period once, each road output current is per three switch once sampling, realizes multiple signals time-division multiplex switch sampling by high-speed analog switch.Feedback signal is input in the pid control algorithm after making difference with fiducial value and calculates in that controller is inner, and the duty ratio of the next switch periods of asking is carried out closed-loop control.
The present invention adopts the hardware configuration of even numbers word controller, no optocoupler, has realized the DC/DC converter of the multichannel output of isolation; And adopt the method that the different parameter adaptive of many group performance emphasis switches to improve its dynamic responding speed.The implementation basis of the control algolithm that is adopted is the set point that the Error Absolute Value of controlled volume exceeds steady-state error, the adaptive digital DC/DC control method that adopts the present invention to have fast dynamic response both can guarantee steady-state behaviour, had also well satisfied the requirement of dynamic responding speed and regulating effect simultaneously.
Above content is to further describing that the present invention did in conjunction with concrete preferred implementation, can not assert that concrete enforcement of the present invention is confined to these explanations, the present invention described here (for example can have many variations, for adapting to different operating modes, can design many group parameters and carry out the self adaptation switching).This variation can not be thought and departs from the spirit and scope of the present invention.Therefore, the change that all it will be apparent to those skilled in the art all is included within the covering scope of these claims.
Claims (6)
1. adaptive digital DC/DC control method with fast dynamic response, it is characterized in that: when sinking or upper punch appears in output voltage, the error that detects the formation of output voltage fiducial value and current output voltage is a plus or minus, when the absolute value of error surpasses preset threshold, switch to the second good proportional-integral derivative controller of dynamic characteristic by the first good proportional-integral derivative controller of steady-state characteristic, when error becomes negative or positive, output voltage begins to enter stable state, just be consecutively detected error, think when bearing alternate and reach stable state, if when judging that absolute value when error is less than preset threshold, then switch to described first proportional-integral derivative controller by described second proportional-integral derivative controller, it comprises step:
A: the initial value that reads in control algolithm;
B: current voltage is sampled, obtain the error that output voltage fiducial value and current output voltage form;
C: according to the currency of error, the parameter switching mark is set, and flag bit is chosen proportional-integral derivative controller thus;
D: the duty ratio of calculating current period;
E: judge whether described duty ratio is saturated, as take place saturatedly, move back saturated processing, otherwise keep result of calculation constant;
F: the initial value that upgrades described duty ratio and described error according to the mode of iteration;
G: judged whether the symbol of described error current and the error symbol of last one-period be reverse, and write down the positive and negative number of times that replaces of described error,, think that output has reached stable state, upgrades described parameter switching mark if the positive and negative alternate frequency of described error reaches predetermined value;
H: carry out described steps A once more, carry out the circulation in next cycle.
2. according to the described adaptive digital DC/DC of claim 1 control method, it is characterized in that: described steps A is specially: the initial value that reads in control algolithm, if converter is just to start, then the initial value of duty ratio and error is zero, otherwise, the initial value of duty ratio is the historical calculated value of preceding two switch periods, and the initial value of error is the sample history value of preceding two switch periods.
3. according to the described adaptive digital DC/DC of claim 1 control method, it is characterized in that: described step C is specially: the initial value of parameter switching mark is 0, if error surpasses preset threshold, the parameter switching mark is 1, otherwise remain 0, if the parameter switching mark is 1, then switch to good described second proportional-integral derivative controller of dynamic characteristic, and to get described second proportional-integral derivative controller be current controller parameter, and the first good proportional-integral derivative controller is current controller parameter otherwise get described steady-state characteristic.
4. according to the described adaptive digital DC/DC of claim 1 control method, it is characterized in that: the duty ratio calculation method that calculates current period among the described step D is: u (n)=a
11* u (n-1)+a
12* u (n-2)+b
10* e (n)-b
11* e (n-1)+b
12* e (n-2), in the formula: u (n) is current period dutyfactor value, u (n-1) for one-period dutyfactor value forward, u (n-2) are the dutyfactor value in two cycles forward, and e (n) be that the error amount, e (n-1) of current period is the error amount in two cycles forward for error amount, the e (n-2) of one-period forward; a
11, a
12, b
10, b
11And b
12Be the coefficient relevant with proportional-integral derivative controller.
5. according to the described adaptive digital DC/DC of claim 1 control method, it is characterized in that: move back saturated processing described in the described step e and be specially: if the calculated value of current duty ratio is greater than 1, output duty cycle amplitude limit to 1 then, and the initial value of duty ratio all puts 1, the whole zero clearings of the initial value of error; If the calculated value of current duty ratio is less than 0, the whole zero clearings of the initial value of then output duty cycle amplitude limit to 0, and duty ratio and error.
6. according to the described adaptive digital DC/DC of claim 1 control method, it is characterized in that: the method for initial value of upgrading described duty ratio and described error in the described step F is upgraded the initial value of described duty ratio and error for the error amount of the result of calculation of current period, current period and the error in the previous cycle initial value as next cycle.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008101004019A CN101286702B (en) | 2008-05-06 | 2008-05-13 | Adaptive digital DC/DC control method and converter with fast dynamic response |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810067086.4 | 2008-05-06 | ||
| CN200810067086 | 2008-05-06 | ||
| CN2008101004019A CN101286702B (en) | 2008-05-06 | 2008-05-13 | Adaptive digital DC/DC control method and converter with fast dynamic response |
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| CN102946189B (en) * | 2011-08-15 | 2016-04-27 | 伊博电源（杭州）有限公司 | A kind of control method of digital power control system |
| CN102916572B (en) * | 2012-06-12 | 2016-02-03 | 华中科技大学 | Suppress secondary ripple wave electric current and improve control method and the system of dynamic characteristic |
| CN103336426B (en) * | 2013-07-12 | 2016-12-28 | 深圳市航天新源科技有限公司 | Make the device and method of changer output characteristics and load characteristic matching |
| CN103457470B (en) * | 2013-08-21 | 2016-07-06 | 中国人民解放军海军工程大学 | MW class is pressed the adaptive nonlinear control method of intermediate frequency three level DC inverter |
| US9428062B2 (en) * | 2014-04-23 | 2016-08-30 | GM Global Technology Operations LLC | Duty cycle updates for a power converter |
| CN105809203B (en) * | 2016-03-15 | 2019-01-18 | 浙江大学 | A kind of systematic steady state detection algorithm based on hierarchical clustering |
| CN107436560A (en) * | 2016-05-26 | 2017-12-05 | 台达电子企业管理（上海）有限公司 | Power control method, power control and power control system |
| US10439500B2 (en) * | 2017-02-01 | 2019-10-08 | Infineon Technologies Austria Ag | Control of isolated power converters during transient load conditions |
| CN110941205A (en) * | 2018-09-21 | 2020-03-31 | 欧姆龙(上海)有限公司 | Sampling control device, sampling control method and electronic equipment |
| US10700605B1 (en) | 2018-12-12 | 2020-06-30 | Infineon Technologies Austria Ag | Electrical power converter with predictor |
| CN116505766B (en) * | 2023-06-26 | 2023-09-15 | 西安天和激光仪器有限责任公司 | DC-DC output voltage dynamic regulation method |
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