CN100530920C - Linear predictive system and method for DC-DC converter - Google Patents
Linear predictive system and method for DC-DC converter Download PDFInfo
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- CN100530920C CN100530920C CNB2005100650852A CN200510065085A CN100530920C CN 100530920 C CN100530920 C CN 100530920C CN B2005100650852 A CNB2005100650852 A CN B2005100650852A CN 200510065085 A CN200510065085 A CN 200510065085A CN 100530920 C CN100530920 C CN 100530920C
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Abstract
A linear predictive system for a DC-DC converter including a linear predictive controller, first and second adders and a multiplier. The DC-DC converter generates an output signal and includes a digital compensation block that converts a feedback error signal into a main duty cycle signal. The linear predictive controller predicts linear changes of the main duty cycle signal in response to changes of the output signal and provides a predictive duty cycle signal. The first adder subtracts the predictive duty cycle signal from the main duty cycle signal to provide a duty cycle delta. The multiplier multiplies the duty cycle delta by a gain factor to provide a duty cycle delta sample. The second adder adds the duty cycle delta sample to the first duty cycle signal to generate an adjusted duty cycle signal. The linear predictive controller performs an inverse function of DC-DC conversion approximated to the first order.
Description
The cross reference of related application
The application enjoys the U.S. Provisional Patent Application No.60/530 of on December 16th, 2003 application, and 034, be entitled as the priority of " linear predictive controller ", and intentional and purpose is hereby expressly incorporated by reference it for institute.
Technical field
The present invention relates to DC-DC (DC-DC) power inverter, relate in particular to a kind of linear predictive controller, this controller allows to use the inductor of high numerical value under low-frequency switching, so that raise the efficiency and simultaneously transition numerical value is remained under the permissible level.
Background technology
The DC-DC converter normally is converted into adjusted output voltage with unadjusted DC input voitage.This output voltage or part output voltage can feed back to control system, by this control system comparison feedback signal and reference voltage so that feedback error signal is provided.A digital compensating module can produce a basic or main duty cycle signals according to feedback error signal.In the operation of standard, this digital compensation module changes the duty ratio of main duty cycle signals according to feedback error signal, to attempt adjusting output voltage according to reference signal.The DC-DC converter can generate output signal according to the main duty cycle signals that the digital compensation module is provided.
Summary of the invention
At least one therewith the relevant problem of standard configuration be that the digital compensation module is slower relatively, thereby reduced the adjustment efficient of output signal.But can under the condition that increases cost, come raising speed by bandwidth and the response that increases fundamental system.
The linear prediction system of the DC-DC of being used for converter according to an embodiment of the invention comprises a linear predictive controller, first and second accumulators and a multiplier.The operation of this DC-DC converter recently produces output signal according to duty usually, and comprises a digital compensating module, and this digital compensation module can be transformed into feedback error signal main duty cycle signals.Linear predictive controller response variation of output signals is predicted the linear change of main duty cycle signals, and the prediction duty cycle signals of its linear change of expression is provided.First accumulator deducts the prediction duty cycle signals from main duty cycle signals, so that a duty ratio increment (delta) to be provided.Multiplier multiply by a gain factor with the duty ratio increment, so that the sample of a duty cycle increment to be provided.Second accumulator is superimposed with main duty cycle signals with duty ratio increment sample, to produce an adjustable duty cycle signals.
Gain factor generally is between 0 and 1 and less than 1, and provides for the stability of loop.This linear predictive controller can be carried out the inverse function of the DC-DC converter that is approximately first rank.
DC-Dc converter according to an embodiment of the invention comprises a compensating module, DC-DC module, linear predictive controller and first and second combiners.Compensating module converts feedback error signal to a main duty cycle signals.First combiner is superimposed to described main duty cycle signals with the duty ratio increment, to produce the duty cycle signals of an adjustment.The DC-DC module produces output signal according to the duty cycle signals of this adjustment.Linear predictive controller response variation of output signals is predicted the variation of main duty cycle signals, and the prediction duty cycle signals of its variation of expression is provided.Second combiner deducts the prediction duty cycle signals from main duty cycle signals, so that the duty ratio increment to be provided.
The DC-DC converter can comprise a multiplier, and it multiply by the loop gain factor with the duty ratio increment, so that the improved duty ratio increment that provides to first combiner to be provided.This linear predictive controller can be carried out the inverse function of the DC-DC module that is approximately first rank.
A kind of method of operating the DC-DC power inverter according to an embodiment of the invention, comprise: convert feedback error signal to main duty cycle signals, main duty cycle signals and duty ratio increment are superposeed so that the duty cycle signals of an adjustment to be provided, produce an output signal according to the duty cycle signals of adjusting, the variation of response variation of output signals linear prediction duty ratio to be providing a prediction duty ratio, and deducts the prediction duty ratio so that the duty ratio increment to be provided from main duty cycle signals.This method can comprise that the duty ratio increment multiply by the loop gain factor.This method also can comprise the inverse function of carrying out the DC-DC converter, produces output signal and is approximately first rank.
The linear predictor module is reacted than digital compensation module fasterly, changes with response output and predicts the variation of duty ratio, thereby more closely adjust the voltage output signal.
Description of drawings
With reference to following discussion and the accompanying drawing effect that the present invention may be better understood, performance and advantage.Accompanying drawing comprises:
Fig. 1 is the block diagram with power-supply system of the linear predictive controller of exemplary embodiments according to the present invention.
Embodiment
Following description makes the skilled artisan in this area can realize and use the present invention who is provided in specific application and its range of needs.Yet, all will be conspicuous concerning the skilled artisan of this area to the various improvement of preferred embodiment, and General Principle defined herein can be applied to other embodiment.Therefore, the present invention is not intended to limit the specific embodiment that this paper is shown and describe, and is intended to and principle presently disclosed and novel features the most wide in range corresponding to scope.
Linear predictive controller according to an embodiment of the invention allows to use the inductor of high numerical value under low-frequency switching, so that raise the efficiency and keep transition numerical value to be under the permissible level simultaneously.The invention provides the ability that has very fast stabilization time and do not need to increase bandwidth.
Fig. 1 is the block diagram of PWM power-supply system 100 with linear predictive controller of the exemplary embodiments according to the present invention.The loop of a standard comprises a combiner 101 (such as, accumulator), and it has the normal phase input end and the inverting input that receives output signal VOUT that receive reference voltage VREF.Combiner 101 deducts VOUT from VREF, to produce a feedback error signal ER, this signal can offer an input of digital compensation module 103.Digital compensation module 103 receives the ER signals and produces a duty cycle D at its output.Ignore combiner 105, duty ratio D offers an input of DC-DC converter, and wherein the DC-DC converter can DC-DC mode module 107 be represented.DC-DC mode module 107 receives D signal (a perhaps one version), and produces the VOUT signal according to the D signal.The transfer function of digital compensation module 103 and DC-DC mode module 107 is respectively Gc and G
PT(z).
In an exemplary embodiments, the D duty cycle signals has by digital compensation module 103 determined duty ratios, so that adjust VOUT according to VREF.In the operation of standard, digital compensation module 103 produces the D signal with duty ratio according to the ER signal, attempts to adjust VOUT based on VREF.DC-DC mode module 107 generates the VOUT signal according to the duty ratio of D signal, and with the inverting input of VOUT signal feedback to combiner 101, to finish substantially or mainly to change loop.At least one problem relevant with this standard configuration is, digital compensation module 103 is relatively slow, and this has just reduced the adjustment efficient of VOUT.Can under the condition that increases cost, come raising speed by bandwidth and the response that increases fundamental system.
Increase a prediction module 109 with transfer function GPre (z), it has the input and the output that prediction duty cycle signals PDC is provided that receive the VOUT signal, and this output is provided for the anti-phase input of another combiner 111.Combiner 111 has and is coupled to the input that digital compensation module 103 outputs are used to receive the D signal.The output of combiner 111 offers multiplier or has the gain module 113 of constant-gain factor k, the output of module 113 is offered the normal phase input end of another combiner 105.And this D signal offers the normal phase input end of combiner 105, and this combiner 105 superposes the output of D signal and gain module 113, to generate a duty cycle signals DTC who offers the adjustment of DC-DC mode module 107.
The transfer function GPre of predictor module 109 (z) is equivalent to the 1/G that is approximately first rank
PT(z), wherein, G
PT(z) be the transfer function of DC-DC mode module 107.Thereby predictor module 109 is carried out DC-DC mode module 107 contrafunctional quick and simplify versions, thereby and the required duty ratio of the actual VOUT signal of prediction generating.Input that it should be noted that DC-DC mode module 107 is a duty ratio, and its output then is output voltage VO UT, and the input of predictor module 109 is output voltage VO UT, and its output then is prediction duty ratio PDC.Because inverse function is approximately first rank, so it can be carried out and the response of the obvious faster ground of comparable main loop predictive loop very apace.From D, deduct this PDC, so that expression D to be provided the duty ratio difference or the duty ratio increment of signal errors.For negative feedback, PDC deducts from D, thereby the negative duty ratio increment of add-back loop should be able to correction error in theory.Gain module 113 multiplies each other duty ratio increment and gain factor k for the stability of loop, and its result is added on the D signal, is used for the correction of loop.
The duty ratio of supposing D signal when time t=0 is " D ", and it has the VOUT=V of being output as, and then the output of predictor module 109 also should be at identical duty ratio " D ".Yet, if the voltage of VOUT increases to VOUT+v, wherein, the incremental voltage of " v " expression VOUT changes, then the output of predictor module 109 is D+ " d " at " D " at first, and wherein, the increment that " d " expression response VOUT increment changes at predictor module 109 outputs changes.Yet the output of digital compensation module 103 slowly still is in the duty ratio of D.Combiner 111 deducts D+d from D, with the duty ratio increment " d " that obtains bearing, it and gain factor k multiply each other, for combiner 105 provides-kd.Combiner 105 with produced-kd is superimposed to D, changes over D-kd with the duty ratio with the DTC signal.Like this, predictor module 109 is reacted than digital compensation module 103 fasterly, with the variation of response output variation prediction duty ratio, thereby more closely adjusts the VOUT signal.
Hope can adopt digitial controller or analog controller to be realized.
Though the present invention is described in detail with reference to above-mentioned some embodiment, other various version and variation all are possible and desired.Skilled artisan in this area is to be appreciated that can be under the condition that does not deviate from the spirit and scope of the present invention, and conduct provides the identical purpose of the present invention other structure Design and improved basis in addition with specific embodiments easily to use disclosed notion.
Claims (13)
1. linear prediction system that is used for the DC-DC converter, wherein, dispose described DC-DC converter to produce output signal according to duty ratio, and described DC-DC converter comprises a digital compensation module that feedback error signal is converted to main duty cycle signals in first feedback control loop, and described linear prediction system comprises:
Linear predictive controller, be configured to the linear change that responds the variation in the described output signal and predict described main duty cycle signals, and be configured in second feedback control loop from described output signal and produce the prediction duty cycle signals, wherein said prediction duty cycle signals is represented described linear change;
First combiner is configured to and deducts described prediction duty cycle signals from main duty cycle signals, to produce a duty ratio increment;
Multiplier is configured to described duty ratio increment be multiply by a gain factor, to produce a duty ratio increment sample; With
Second combiner is configured to described duty ratio increment sample stack is added to described main duty cycle signals, to produce the duty cycle signals of an adjustment.
2. linear prediction system according to claim 1 is characterized in that described gain factor is less than 1.
3. linear prediction system according to claim 1 is characterized in that, described linear predictive controller is configured to the inverse function of carrying out the described DC-DC converter that is approximately first rank.
4. DC-DC converter comprises:
The DC-DC module is configured to output signal of duty cycle signals generation that response is adjusted;
Compensating module is coupled in described DC-DC module in first feedback control loop, and is configured to response described output signal and produce a main duty cycle signals;
Linear predictive controller is coupled in described DC-DC module in second feedback control loop, and be configured to response in the described output signal variation and produce a prediction duty cycle signals; With
First combiner is coupled in described compensating module, is coupled in described DC-DC module, and is configured to by a duty ratio increment is superimposed to described main duty cycle signals to produce the duty cycle signals of described adjustment; And
Second combiner, this second combiner is coupled in described linear predictive controller, and is configured to and deducts described prediction duty cycle signals to produce described duty ratio increment from described main duty cycle signals.
5. DC-DC converter according to claim 4 is characterized in that, described linear predictive controller is configured to from described output signal and produces described prediction duty cycle signals, and wherein said prediction duty cycle signals is represented the described variation of described output signal.
6. DC-DC converter according to claim 5, it is characterized in that, further comprise the multiplier that is coupled in described second combiner and is coupled in described first combiner, and described multiplier is configured to the described duty ratio increment and the loop gain factor is multiplied each other, thereby produces an improved duty ratio increment;
Described first combiner is configured to from the described main duty cycle signals described improved duty ratio increment that superposes, thereby produces the duty cycle signals of described adjustment.
7. DC-DC converter according to claim 6 is characterized in that, the described loop gain factor is between 0 and 1.
8. DC-DC converter according to claim 4, it is characterized in that, described DC-DC converter additionally comprises the 3rd combiner, the 3rd combiner is coupled in described DC-DC module and is coupled in described compensating module, and be configured to and from reference signal, deduct described output signal, thereby produce feedback error signal; And
Described compensating module is configured to described feedback error signal is converted to described main duty cycle signals.
9. DC-DC converter according to claim 4 is characterized in that, described linear predictive controller is configured to the inverse function of carrying out the described DC-DC module that is approximately first rank.
10. method of operating the DC-DC power inverter comprises:
In first feedback control loop, feedback error signal converted to main duty cycle signals;
Described main duty cycle signals and a duty ratio increment are superposeed, to produce the duty cycle signals of adjusting;
Respond the duty cycle signals of described adjustment and produce output signal;
Respond described variation of output signals and the variation of linear prediction duty ratio, in second feedback control loop, to produce the duty ratio of prediction; And
From described main duty cycle signals, deduct described prediction duty ratio, to produce described duty ratio increment.
11. method according to claim 10 is characterized in that, described linear prediction comprises the inverse function of carrying out the described DC-DC power inverter that is approximately first rank.
12. method according to claim 10 is characterized in that, further comprises deducting described output signal from reference signal, to produce described feedback error signal.
13. method according to claim 10 is characterized in that, further comprises described duty ratio increment be multiply by the loop gain factor.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US10/827,200 | 2004-04-19 | ||
| US10/827,200 US7038432B2 (en) | 2003-12-16 | 2004-04-19 | Linear predictive controller |
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| CN100530920C true CN100530920C (en) | 2009-08-19 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109149936A (en) * | 2018-09-12 | 2019-01-04 | 西安理工大学 | A kind of duty ratio Predictive Control System and control algolithm being applicable in DC/DC converter |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2011103928A1 (en) * | 2010-02-26 | 2011-09-01 | Telefonaktiebolaget Lm Ericsson (Publ) | Feedforward digital control unit for switched mode power supply and method thereof |
| US8593117B2 (en) * | 2011-02-24 | 2013-11-26 | Maxin Integrated Products, Inc. | Delay compensation systems and methods for DC to DC converters |
| CN102818336A (en) * | 2011-06-09 | 2012-12-12 | 北京巨磁源电机有限公司 | Automobile air conditioner controller based on predictive control algorithm |
| US8791647B2 (en) * | 2011-12-28 | 2014-07-29 | Dialog Semiconductor Inc. | Predictive control of power converter for LED driver |
| CN103036460B (en) * | 2012-11-26 | 2014-10-22 | 天津大学 | Model prediction control method for three-level voltage-source-type converter |
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2005
- 2005-04-06 CN CNB2005100650852A patent/CN100530920C/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109149936A (en) * | 2018-09-12 | 2019-01-04 | 西安理工大学 | A kind of duty ratio Predictive Control System and control algolithm being applicable in DC/DC converter |
| CN109149936B (en) * | 2018-09-12 | 2020-06-26 | 西安理工大学 | Duty ratio prediction control system and control algorithm suitable for DC/DC converter |
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| CN1691483A (en) | 2005-11-02 |
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