CN110943620A - Phase-shifting sliding mode control method and system of LLC resonant DC converter - Google Patents
Phase-shifting sliding mode control method and system of LLC resonant DC converter Download PDFInfo
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
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Abstract
The invention discloses a phase-shifting sliding mode control method and a system of an LLC resonant direct current converter, wherein an output voltage signal of the LLC resonant direct current converter is sampled and compared with a reference voltage signal, and a comparison result is converted into a sliding mode output signal; converting the sliding mode output signal into a phase shift switching signal; generating a driving signal with a phase shift angle according to the phase shift ratio switching signal; and respectively driving a plurality of power switch tubes in the LLC resonant DC converter by the generated driving signals. The advantages are that: the control of a hysteresis loop sliding mode variable structure is adopted to switch the phase shift ratio of the leading bridge arm and the lagging bridge arm of the converter between the maximum shift ratio and the minimum shift ratio, so that the robustness of the converter can be improved while the stable output of the LLC series resonant converter is regulated, and the wide-range voltage input can be realized.
Description
Technical Field
The invention relates to a phase-shifting sliding mode control method and system of an LLC resonant direct current converter, and belongs to the technical field of resonant converter control.
Background
The most common control strategy of the existing LLC resonant DC converter is frequency conversion control, but when the input voltage is too high and the gain is too low, the frequency conversion control cannot achieve an ideal effect, so when the gain of the converter is less than 1, phase shift control can be adopted. The existing LLC resonant DC converter phase shift control usually adopts a traditional PID control feedback loop, a subtracter compares sampling output with a reference quantity, and a comparison result is subjected to PID control to generate phase shift comparison. The traditional PID control has the advantages of simple control, good stability and strong applicability, but is sensitive to the change of system parameters, and has the defects of low dynamic response speed, distortion of output waveform and the like when the input voltage changes in a large range. Nowadays, the LLC resonant dc converter has a wider application range, and its performance requirements are continuously improved, especially the converter is required to have a high steady-state accuracy and a strong robustness, and the traditional PID control strategy is difficult to meet the requirements.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a phase-shifting sliding mode control method and system of an LLC resonant direct current converter.
In order to solve the above technical problem, the present invention provides a phase-shifting sliding mode control method for an LLC resonant dc-to-dc converter, which is characterized by comprising the following steps:
(1) sampling an output voltage signal of the LLC resonant DC converter, comparing the output voltage signal with a reference voltage signal, and converting a comparison result into a sliding mode output signal;
(2) converting the sliding mode output signal into a phase shift switching signal;
(3) generating a driving signal with a phase shift angle according to the phase shift ratio switching signal;
(4) and respectively driving a plurality of power switch tubes in the LLC resonant DC converter by the generated driving signals.
Further, the frequency control of the driving signal is not changed.
Further, the phase shift ratio switching signal includes a maximum phase shift ratio switching signal and a minimum phase shift ratio switching signal, and the maximum phase shift ratio switching signal and the minimum phase shift ratio switching signal are converted according to the sliding mode output signal acquired in real time.
Further, the shift ratio is switched by a shift ratio switching function, the shift ratio switching function being:
D＝Dmin+u(Dmax-Dmin)
wherein u is a control quantity, DminTo minimize phase shift ratio, DmaxThe minimum shift ratio and the maximum shift ratio are selected for the maximum shift ratio according to the input voltage range and the output voltage range required by the converter.
Further, the control amount is obtained using the following equation:
wherein S is a sliding mode surface,
the slip form surface S is a second-order slip form surface or a third-order slip form surface.
The second-order slip form surface is as follows:
wherein v isoIs the output voltage, v, of an LLC resonant DC converterrefIs a reference voltage, K1Is a proportionality coefficient, K2Is a differential coefficient;
the third-order slip form surface is as follows:
wherein v isoIs the output voltage, v, of an LLC resonant DC converterrefIs a reference voltage, K1Is a proportionality coefficient, K2Is a differential coefficient, K3Is an integral coefficient.
A phase-shifting sliding mode control system of an LLC resonant DC converter comprises a sampling comparison module, a signal conversion module, a driving signal module and a control module;
the sampling comparison module is used for sampling an output voltage signal of the LLC resonant DC converter, comparing the output voltage signal with a reference voltage signal and converting a comparison result into a sliding mode output signal;
the signal conversion module is used for converting the sliding mode output signal into a phase shift ratio switching signal;
the driving signal module is used for generating a driving signal with a phase shifting angle according to the phase shifting ratio switching signal;
and the control module is used for driving the generated driving signals to drive a plurality of power switching tubes in the LLC resonant DC converter respectively.
Further, the driving signal module includes a frequency control module, which is used for controlling the frequency of the driving signal to be unchanged.
Further, the phase shift ratio switching signal converted by the signal conversion module includes a maximum phase shift ratio switching signal and a minimum phase shift ratio switching signal, and the maximum phase shift ratio switching signal and the minimum phase shift ratio switching signal are converted according to the sliding mode output signal acquired in real time.
Further, the signal conversion module comprises a phase shift switching module for switching phase shift
The control phase ratio is switched by a phase ratio switching function, which is:
D＝Dmin+u(Dmax-Dmin)
wherein u is a control quantity, DminTo minimize phase shift ratio, DmaxThe minimum shift ratio and the maximum shift ratio are selected for the maximum shift ratio according to the input voltage range and the output voltage range required by the converter.
Further, the signal conversion module further includes a control quantity processing module, configured to obtain a control quantity u by using the following formula:
wherein S is a sliding mode surface,
the slip form surface S is a second-order slip form surface or a third-order slip form surface.
The second-order slip form surface is as follows:
wherein v isoIs the output voltage, v, of an LLC resonant DC converterrefIs a reference voltage, K1Is a proportionality coefficient, K2Is a differential coefficient;
the third-order slip form surface is as follows:
wherein v isoIs the output voltage, v, of an LLC resonant DC converterrefIs a reference voltage, K1Is a proportionality coefficient, K2Is a differential coefficient, K3Is an integral coefficient.
The invention achieves the following beneficial effects:
the sliding mode control with good dynamic characteristic effect is applied to the phase shift control of the LLC resonant DC converter, so that the LLC resonant DC converter improves the robustness of the converter on the basis of having good steady-state characteristic, has good adaptability to wide-range voltage input, and can meet the application occasions with high performance requirements;
the invention adopts a double phase-shifting switching mode to control the output of the LLC resonant DC converter, and the converter can adjust the converter to a stable working state through phase-shifting switching at the moment of the change of the input voltage, thereby shortening the dynamic response time and improving the dynamic characteristic of the converter.
Drawings
FIG. 1 is a topology diagram of an LLC resonant DC converter;
FIG. 2 is a structural diagram of a phase-shifting sliding mode controller of the LLC resonant DC converter of the invention;
FIG. 3 is a graph comparing the output waveform of the LLC resonant DC converter under the control of the invention and the output voltage waveform under PI control under the stable working condition with the input voltage of 500V;
fig. 4 is a graph comparing the output waveform of the LLC resonant dc converter under the control of the present invention with the output voltage waveform under PI control under the operating condition that the input voltage is abruptly changed in a wide range from 500V to 1000V.
Fig. 5 is a comparison graph of the output voltage waveform of the LLC resonant dc-dc converter under the control of the present invention and the output voltage waveform under PI control under the operating condition that the reference voltage is abruptly changed from 250V to 200V.
Detailed Description
In order to make the objects, features and advantages of the present invention more obvious and understandable, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the embodiments described below are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The technical scheme of the invention is further explained by the specific implementation mode in combination with the attached drawings.
A phase-shifting sliding mode control method of an LLC resonant DC converter comprises the following steps:
(1) sampling an output voltage signal of the LLC series resonance DC-DC converter, comparing the output voltage signal with a reference voltage signal to generate an error signal, and converting a comparison result into a sliding mode function;
(2) generating a phase shift switching signal according to the size of the sliding mode function;
(3) generating a driving signal with a phase shift angle according to the phase shift ratio switching signal;
(4) and respectively driving 4 power switch tubes in the LLC resonant DC converter by the generated driving signals.
As shown in fig. 1, the sampled voltage signal VoAnd a reference voltage VrefAnd obtaining error signals after comparison, forming a sliding mode function S by the signals, obtaining a phase shift ratio value according to the positive and negative of the sliding mode function S, converting the value into a phase shift angle, and generating the PWM driving signal with the phase shift angle.
Wherein the shift ratio is defined as:
wherein the content of the first and second substances,
the lagging leg lags the leading leg by an angle. The leading leg and the lagging leg are shown in fig. 2. In the figure, viIs a DC power supply, viPositive electrode and switch tube V1,V2Is connected to the drain of viNegative electrode and switch tube V3，V4Is connected to the source electrode of VD1,VD2,VD3,VD4A parasitic diode being a switching tube; v1Source and V3Drain electrodes are connected to form a leading bridge arm V2Source and V4The drain electrodes are connected to form a hysteresis bridge arm; v1Source electrode via resonant inductor LrResonant capacitor CrAnd the primary side of the transformer is connected with the drain of V4, LmIs the excitation inductance of the transformer; secondary side of transformer and four diodes VD5,VD6,VD7,VD8Connecting to form an uncontrolled rectifier bridge; the output side of the rectifier bridge is connected with a filter capacitor C, a load R is connected with the capacitor in parallel, and the output voltage V isoIs the voltage across the load. In the phase-shifting mode, the output voltage V can be controlled by changing the phase-shifting angle between the leading bridge arm and the lagging bridge armoThe size of (2). When the input voltage changes or the load suddenly changes, VoAnd the change is transmitted to a phase-shifting sliding mode controller, and the sliding mode controller automatically adjusts to ensure that the output voltage VoIs restored to the reference value VrefNearby.
If the control object is an LLC resonance half-bridge direct current converter, the phase shift ratio is changed into a duty ratio, and is defined as:
wherein, tonThe time T for switching on the upper bridge arm switch tube in a switching periodsIs the switching period of the switching tube.
The switch drive signal is fixed in frequency and the shift ratio is switched between a maximum shift ratio and a minimum shift ratio.
The phase shift ratio is switched by a phase shift ratio switching function. The handover versus switching function is defined as:
D＝Dmin+u(Dmax-Dmin)
wherein u is a control quantity, DminTo minimize phase shift ratio, DmaxIs the maximum shift ratio.
The minimum shift ratio and the maximum shift ratio may be selected based on the input voltage range and the output voltage range required by the converter.
The control amount u is defined as:
wherein S is a slip form surface.
The slip form surface S may be a second order slip form surface or a third order slip form surface.
The second order slip form surface is:
wherein v isoIs the output voltage, v, of an LLC resonant DC converterrefIs a reference voltage, K1Is a proportionality coefficient, K2Is a differential coefficient.
The third order slip form surface is:
wherein v isoIs the output voltage, v, of an LLC resonant DC converterrefIs a reference voltage, K1Is a proportionality coefficient, K2Is a differential coefficient, K3Is an integral coefficient.
If the control object is an LLC resonance half-bridge direct current converter, the phase shift ratio is changed into a duty ratio, and is defined as:
wherein, tonThe time T for switching on the upper bridge arm switch tube in a switching periodsIs the switching period of the switching tube.
A phase-shifting sliding mode control system of an LLC resonant DC converter comprises a sampling comparison module, a signal conversion module, a driving signal module and a control module;
the sampling comparison module is used for sampling an output voltage signal of the LLC resonant DC converter, comparing the output voltage signal with a reference voltage signal and converting a comparison result into a sliding mode output signal;
the signal conversion module is used for converting the sliding mode output signal into a phase shift ratio switching signal;
the driving signal module is used for generating a driving signal with a phase shifting angle according to the phase shifting ratio switching signal;
and the control module is used for driving the generated driving signals to drive a plurality of power switching tubes in the LLC resonant DC converter respectively.
In this embodiment, the driving signal module includes a frequency control module, and is configured to control the frequency of the driving signal to be unchanged.
In this embodiment, the phase shift ratio switching signals converted by the signal conversion module include a maximum phase shift ratio switching signal and a minimum phase shift ratio switching signal, and the maximum phase shift ratio switching signal and the minimum phase shift ratio switching signal are converted according to the sliding mode output signal obtained in real time.
In this embodiment, the signal conversion module includes a phase shift switching module for switching between the phase shift mode and the phase shift mode
The control phase ratio is switched by a phase ratio switching function, which is:
D＝Dmin+u(Dmax-Dmin)
wherein u is a control quantity, DminTo minimize phase shift ratio, DmaxThe minimum shift ratio and the maximum shift ratio are selected for the maximum shift ratio according to the input voltage range and the output voltage range required by the converter.
In this embodiment, the signal conversion module further includes a control amount processing module, configured to obtain a control amount u according to the following formula:
wherein S is a sliding mode surface,
the slip form surface S is a second-order slip form surface or a third-order slip form surface.
The second-order slip form surface is as follows:
wherein v isoIs the output voltage, v, of an LLC resonant DC converterrefIs a reference voltage, K1Is a proportionality coefficient, K2Is a differential coefficient;
the third-order slip form surface is as follows:
wherein v isoIs the output voltage, v, of an LLC resonant DC converterrefIs a reference voltage, K1Is a proportionality coefficient, K2Is a differential coefficient, K3Is an integral coefficient.
The invention is carried out with simulation experiment, further provides the technical effects of the invention:
to verify the effectiveness of the proposed control method, the following simulation experiment was performed. Assuming that the circuit parameters of the LLC dc converter are: l isr＝1.935×10-5H，Lm＝77.4mH，Cr＝1.309×10-7F, rated load R of 12.5 Ω, dc input voltage viAt 500V, the desired output voltage is 200V.
The simulation and discussion are carried out in three cases below.
Case 1: rated operating mode
Fig. 3 is a graph comparing the output waveform of the LLC resonant dc converter under the control of the present invention with the output voltage waveform under the PI control. As can be seen from the figure, the response speed of the phase-shift sliding mode control is faster, the adjusting time is shorter, and the steady-state error is smaller than that of the PI control.
Case 2: sudden change of input voltage
The input voltage is suddenly changed from 500V to 1000V at the time of 0.01s, the output voltage waveform is shown in FIG. 4, and the comparison graph of the output waveform under the control of the invention and the output voltage waveform under the PI control is shown when the input voltage of the LLC resonant DC converter suddenly changes. It can be seen from the figure that under the condition that the input voltage is subjected to large-range sudden change, both the phase-shift sliding mode control and the phase-shift PI control are kept stable, the output voltage waveform is almost unchanged, and the steady-state error of the phase-shift sliding mode is still smaller than that of the PI control.
Case 3: abrupt change of reference voltage
At the time of 0.01s, the reference voltage is suddenly changed from 250V to 200V, and the output voltage is a comparison graph of the output waveform under the control of the invention and the output voltage waveform under the control of PI under the condition that the reference voltage of the LLC resonant converter suddenly changes as shown in FIG. 5. It can be seen from the figure that in the case of a sudden change in the reference voltage, the phase-shift sliding-mode control has a shorter regulation time than the phase-shift PI control and a smaller steady-state error.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
The above-mentioned embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. A phase-shifting sliding mode control method of an LLC resonant DC converter is characterized by comprising the following steps:
(1) sampling an output voltage signal of the LLC resonant DC converter, comparing the output voltage signal with a reference voltage signal, and converting a comparison result into a sliding mode output signal;
(2) converting the sliding mode output signal into a phase shift switching signal;
(3) generating a driving signal with a phase shift angle according to the phase shift ratio switching signal;
(4) and respectively driving a plurality of power switch tubes in the LLC resonant DC converter by the generated driving signals.
2. The method of sliding-mode phase shift control for an LLC resonant dc-to-dc converter as claimed in claim 1, wherein said frequency control of said drive signal is constant.
3. The phase-shifting sliding-mode control method of the LLC resonant DC converter according to claim 1, wherein the phase-shifting comparison switching signals comprise a maximum phase-shifting comparison switching signal and a minimum phase-shifting ratio switching signal, the maximum phase-shifting comparison switching signal and the minimum phase-shifting comparison switching signal being converted according to the sliding-mode output signal obtained in real time.
4. The method for phase-shifting sliding-mode control of an LLC resonant DC converter according to claim 3, wherein said phase-shifting ratio is switched by a phase-shifting ratio switching function, the phase-shifting ratio switching function being:
D＝Dmin+u(Dmax-Dmin)
wherein u is a control quantity, DminTo minimize phase shift ratio, DmaxThe minimum shift ratio and the maximum shift ratio are selected for the maximum shift ratio according to the input voltage range and the output voltage range required by the converter.
5. The phase-shifting sliding-mode control method for the LLC resonant DC converter according to claim 4, wherein said control quantity is obtained by using the following formula:
wherein S is a sliding mode surface,
the slip form surface S is a second-order slip form surface or a third-order slip form surface.
The second-order slip form surface is as follows:
wherein v isoIs the output voltage, v, of an LLC resonant DC converterrefIs a reference voltage, K1Is a proportionality coefficient, K2Is a differential coefficient;
the third-order slip form surface is as follows:
wherein v isoIs the output voltage, v, of an LLC resonant DC converterrefIs a reference voltage, K1Is a proportionality coefficient, K2Is a differential coefficient, K3Is an integral coefficient.
6. A phase-shifting sliding mode control system of an LLC resonant DC converter is characterized by comprising a sampling comparison module, a signal conversion module, a driving signal module and a control module;
the sampling comparison module is used for sampling an output voltage signal of the LLC resonant DC converter, comparing the output voltage signal with a reference voltage signal and converting a comparison result into a sliding mode output signal;
the signal conversion module is used for converting the sliding mode output signal into a phase shift ratio switching signal;
the driving signal module is used for generating a driving signal with a phase shifting angle according to the phase shifting ratio switching signal;
and the control module is used for driving the generated driving signals to drive a plurality of power switching tubes in the LLC resonant DC converter respectively.
7. The phase-shifting sliding-mode control system for the LLC resonant DC converter of claim 6, wherein the drive signal module comprises a frequency control module for frequency control of the drive signal being constant.
8. The phase shifting sliding-mode control system of the LLC resonant DC converter according to claim 6, wherein the phase shifting ratio switching signals converted by said signal conversion module include a maximum phase shifting ratio switching signal and a minimum phase shifting ratio switching signal, and said maximum phase shifting ratio switching signal and said minimum phase shifting ratio switching signal are converted according to the sliding-mode output signals obtained in real time.
9. The phase-shifting sliding-mode control system for the LLC resonant DC converter of claim 8, wherein said signal conversion module comprises a phase-shifting ratio switching module for
The control phase ratio is switched by a phase ratio switching function, which is:
D＝Dmin+u(Dmax-Dmin)
wherein u is a control quantity, DminTo minimize phase shift ratio, DmaxThe minimum shift ratio and the maximum shift ratio are selected for the maximum shift ratio according to the input voltage range and the output voltage range required by the converter.
10. The phase-shifting sliding-mode control system for the LLC resonant dc-to-dc converter of claim 9, wherein the signal conversion module further comprises a control quantity processing module for obtaining the control quantity u using the following formula:
wherein S is a sliding mode surface,
the slip form surface S is a second-order slip form surface or a third-order slip form surface.
The second-order slip form surface is as follows:
wherein v isoIs the output voltage, v, of an LLC resonant DC converterrefIs a reference voltage, K1Is a proportionality coefficient, K2Is a differential coefficient;
the third-order slip form surface is as follows:
wherein v isoIs the output voltage, v, of an LLC resonant DC converterrefIs a reference voltage, K1Is a proportionality coefficient, K2Is a differential coefficient, K3Is an integral coefficient.
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