CN114928251B - Phase-shifting full-bridge power supply controlled by self-adaptive integral sliding mode - Google Patents
Phase-shifting full-bridge power supply controlled by self-adaptive integral sliding mode 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
- H02M3/325—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 using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—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 using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/33569—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 using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements
- H02M3/33573—Full-bridge at primary side of an isolation transformer
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- G—PHYSICS
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- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
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- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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Abstract
The invention discloses a phase-shifting full-bridge power supply adopting self-adaptive integral sliding mode control, which comprises the following components: the phase-shifting full-bridge conversion module is provided with an input voltage output end, an output current output end and a control end; the self-adaptive integral sliding mode controller comprises a first input end connected with an input voltage output end of the conversion module, a second input end connected with a reference voltage output end of the human-computer interaction module, a third input end connected with an output voltage output end of the conversion module, a fourth input end connected with an output current output end of the conversion module, and an output end connected with a control end of the conversion module, wherein the output end is respectively used for determining the working state of the conversion module according to the acquired input voltage, reference voltage, output voltage and output current, and further calculating and outputting a control quantity by adopting a self-adaptive integral sliding mode control method. The direct current power supply can output direct current voltage in a large range, has high conversion efficiency, and has the characteristics of good robustness, rapid load transient response and the like.
Description
Technical Field
The invention belongs to the technical field of power electronic application, and particularly relates to a phase-shifting full-bridge direct-current power supply adopting self-adaptive integral sliding mode control.
Technical Field
With the continuous progress in the fields of electronics, communication and the like, there is an increasing demand for electronic products, and meanwhile, the stability and performance of electronic devices are directly related to the quality of power supplies, so that the demands of people on the power supplies are further and further increased.
The linear power supply is gradually replaced by a switching power supply because of the problems of voltage reduction, large volume, high requirement on input voltage, large ripple, low efficiency and the like, and compared with the switching power supply, the switching power supply has higher efficiency, small volume, low cost and higher output energy density under the condition of high frequency.
At present, the traditional PID control method adopted by most switching power supplies is widely applied due to the advantages of simple principle, simple and convenient operation, wide application range and the like. However, the switching power supply is used as a nonlinear system, the PID is used as a linear control method, and compared with the nonlinear control method, a certain gap exists in the aspects of steady-state precision, dynamic response speed, anti-interference capability and the like.
The sliding mode variable structure control method is used as one of nonlinear control methods, the expected state of the system is realized through switching of different states of the system, and the method has the characteristics of simplicity in realization, rapidness in response, good robustness and the like.
However, most of the Sliding Mode Control methods used for switching Power supplies currently adopt hysteresis modulation, pulse width modulation is necessary for the phase-shifted full-bridge direct current Power supply, the switching frequency is fixed, and literature indicates that adopting the conventional Integral Sliding Mode Control method (Indirect _slip_mode_control_of_power_ Converters _via_double_integral_sliding_surface) under the condition can cause loss of the Integral term effect in Integral Sliding Mode Control, thereby causing increase of the output error along with reduction of the switching frequency, so that Double-Integral Sliding Mode Control is proposed, but in the Double-Integral Sliding Mode Control method, although the Control law is obtained through the equivalent Control method, the method adopts four state variables, so that the stability of the system is reduced, and the calculation is more complex, and the method has no advantage for the phase-shifted full-bridge Power supply with large-scale output. Therefore, in order to apply the integral sliding mode control method to the phase-shifting full-bridge direct-current power supply without affecting the output precision of the power supply, a novel control law needs to be designed to ensure the output precision and dynamic response speed under fixed switching frequency, and the system stability and the direct and visual design process. In addition, the direct-current power supply has the characteristics of wide output voltage range and variable load, and needs to monitor the condition of the load in real time, so that the power supply has certain self-adaptability, and the integral sliding mode controller works in an optimal state.
Disclosure of Invention
The invention aims to provide a phase-shifting full-bridge power supply adopting self-adaptive integral sliding mode control and a self-adaptive integral sliding mode controller, which realize large-range stable output by adopting a self-adaptive integral sliding mode control method, thereby providing the phase-shifting full-bridge power supply with good robustness, high steady-state precision and excellent dynamic response performance.
The invention is realized at least by one of the following technical schemes.
A phase-shifting full-bridge power supply employing adaptive integral sliding mode control, comprising: the system comprises a phase-shifting full-bridge conversion module, a self-adaptive integral sliding mode controller and a man-machine interaction module;
The phase-shifting full-bridge conversion module comprises an input voltage V in output end, an output voltage V o output end, an output current I o output end and a control end d;
The self-adaptive integral sliding mode controller comprises a first input end FBVI, a second input end REF, a third input end FBV, a fourth input end FBC and an output end OUT;
The first input end FBVI is connected with an input voltage V in output end, the second input end REF is connected with a reference voltage V ref output end of the man-machine interaction module, the third input end FBV is connected with an output end of the output voltage V o, the fourth input end FBC is connected with an output end of the output current I o, and the output end OUT is connected with the control end d;
The self-adaptive integral sliding mode controller is used for determining the working state of the phase-shifting full-bridge conversion module according to the acquired input voltage V in, reference voltage V ref, output voltage V o and output current I o, and further calculating and outputting a control quantity u by adopting a self-adaptive integral sliding mode control method;
the man-machine interaction module comprises a first input end D V, a second input end D I and a reference voltage V ref output end.
Further, the adaptive integral sliding mode controller further comprises:
The input end of the reference voltage conversion module is connected with the second input end REF and is used for converting the reference voltage V ref into a control reference signal V cref, converting the reference voltage given by the man-machine interaction module into a corresponding reference signal, and outputting the control reference signal V cref after isolation and filtration;
The input end of the output voltage dividing module is connected with the third input end FBV and is used for converting the output voltage V o into a control voltage signal V co, voltage dividing is carried out by distributing each series resistance value according to the ratio of the maximum output voltage of the phase-shifting full-bridge conversion module to the maximum reference voltage signal of the self-adaptive sliding mode controller, and the signals obtained after voltage dividing pass through a voltage follower to realize the isolation of front and rear-stage circuits;
The load monitoring module is provided with one input end connected with the third input end FBV and the other input end connected with the fourth input end FBC, and is used for obtaining a load resistance value R act;
the state calculation module is provided with one input end connected with the output end of the reference voltage dividing module to obtain a control reference signal V cref, the other input end connected with the output end of the output voltage dividing module to obtain a control voltage signal V co, the control voltage signal V co is used for obtaining three real-time state variables of the direct-current power supply, obtaining a state variable x 1 after difference is obtained between the two inputs, obtaining a state variable x 2 after differentiation of the state variable x 1, and obtaining a state variable x 3 after integration of the state variable x 1;
And the three input ends of the state control module are respectively connected with the three output ends of the state calculation module to obtain real-time state variables x 1、x2 and x 3, the other two input ends of the state control module are respectively connected with the first input end FBVI and the output end of the load monitoring module to obtain input voltage V in and load resistance R act, and a control signal u is calculated according to the self-adaptive integral sliding mode control method and the real-time state variable value to realize the control of the phase-shifting full-bridge conversion module.
Further, the phase-shifting full-bridge conversion module further comprises a first switching tube, a second switching tube, a third switching tube, a fourth switching tube, a switching tube driving module, a PWM output chip, a transformer leakage inductance, a first diode, a second diode, an output inductance, an output capacitance and a load; the input of the PWM output chip is connected with the control end d of the phase-shifting full-bridge conversion module, and the output of the PWM output chip is connected with the input of the switching tube driving module; the output of the switching tube driving module is respectively connected with the gates of the four switching tubes; the positive electrode of the input voltage V in is respectively connected to the collectors of the first switching tube and the third switching tube, the negative electrode is respectively connected to the emitters of the second switching tube and the fourth switching tube, and energy is transmitted through the on and off states of the four switching tubes; the common end of the first switching tube and the second switching tube is connected with one pin of the primary side of the transformer, and the common end of the third switching tube and the fourth switching tube is connected with the other pin of the primary side of the transformer; the primary side of the transformer is connected with four switching tubes, and the secondary side of the transformer is respectively connected with a first diode, a second diode and the ground, wherein leakage inductance of the transformer is intensively represented as transformer leakage inductance of the primary side; the anodes of the first diode and the second diode are respectively connected with two pins of the secondary side of the transformer, and the cathodes are commonly connected to the output inductor; one end of the output inductor is connected with the cathodes of the two diodes, and the other end of the output inductor is connected with the output capacitor and the load; one end of the output capacitor is connected with the output inductor, and the other end of the output capacitor is connected with the ground; the load is connected in parallel with the output capacitance.
Further, the PWM output chip of the phase-shifting full-bridge conversion module converts the control quantity u into a conduction phase difference of front and rear bridge arms of the full bridge, so that two groups of pulse waveforms with fixed frequency and duty ratio but phase difference change are output to the switching tube driving module, and the switching tubes on the front and rear bridge arms are turned on and off in different phases.
Further, the input voltage V in, the output voltage V o, the current I o flowing through the load and the set voltage V ref of the man-machine interaction module of the phase-shifting full-bridge conversion module are fed back to the adaptive integral sliding mode controller after sampling, and are used for calculating the control quantity u.
Further, the state control module obtains the control quantity u by adopting the following control law:
Wherein V ref is reference voltage, V i is DC bus voltage, s is a switching equation, L lk is transformer leakage inductance, R' is equivalent resistance value of load reflected to primary side of full bridge, and f s is switching frequency.
Further, the adaptive integral sliding mode control method comprises the following steps:
according to the integral sliding mode control method, selecting a switching equation s as follows:
s＝α1x1+α2x2+α3x3
In which the state variable x 1＝Vref-vo, V o is the actual output voltage of the power supply, v is the reference voltageIn a differentiated form of state variable x 1;
the equivalent control law u eq is obtained by an equivalent control method as follows:
Wherein, alpha 1、α2 and alpha 3 are both sliding coefficients, L is an output inductance, C is an output capacitance, v i is an input voltage, and R is a load resistance;
adding integral term in control law, then new control law u is:
When (when) There is control law/>Let/> And/>Finally, the final control law is obtained by the relation between the phase-shifting full-bridge topology and the Buck topology:
Further, the man-machine interaction module further comprises an input module and an output module; the input module is connected with the output end of the reference voltage V ref, and the user inputs the output voltage value set by the direct current power supply; the output module is respectively connected with the first input end D V and the second input end D I and displays the output voltage value and the current value of the direct current power supply in real time.
Further, the input module comprises a keyboard and a DA chip, when a user types in a set voltage value through the keyboard, the DA chip converts the set value into an analog quantity, and then the analog quantity is connected to the second input end REF of the self-adaptive integral sliding mode controller through the output end of the reference voltage V ref.
Further, the output module includes a display screen and an AD chip, and when the first input end D V and the second input end D I of the man-machine interaction module obtain the output voltage V o and the output current I o of the phase-shifting full-bridge conversion module, the output voltage V o and the output current I o are converted into digital values by the AD chip and displayed by the display screen.
Compared with the prior art, the invention has the beneficial effects that:
Compared with a linear control method, the self-adaptive integral sliding mode control method is adopted, so that the robustness, steady-state precision and dynamic response performance of the direct-current power supply are improved; compared with a common sliding mode control method, the method has stable switching frequency and higher steady-state precision; compared with a double-integral sliding mode control method, fewer state variables are selected, so that the calculated amount and the design difficulty are reduced, and the system stability is improved.
Drawings
FIG. 1 is a diagram of a phase-shifted full-bridge power supply employing adaptive integral sliding mode control;
FIG. 2 is a block diagram of a phase-shifted full-bridge power supply control employing adaptive integral sliding mode control;
FIG. 3 is a state motion trace of the integral sliding mode control method;
FIG. 4 is a graph of transient response of the phase-shifted full-bridge power supply during load changes;
fig. 5 is a graph of the transient response of the phase-shifted full-bridge power supply when the input voltage is changed.
Detailed Description
The present invention is further described below by way of specific examples for better understanding of the present invention, but any changes or substitutions that would be easily recognized by those skilled in the art within the technical scope of the present invention are intended to be covered by the scope of the claims of the present invention.
Referring to fig. 1, a phase-shifting full-bridge power supply adopting adaptive integral sliding mode control comprises a phase-shifting full-bridge conversion module 1, an adaptive integral sliding mode controller 2 and a man-machine interaction module 3.
The phase-shifting full-bridge conversion module 1 comprises an input voltage V in output end, an output voltage V o output end, an output current I o output end, a control end u and the like.
The adaptive integral sliding mode controller 2 comprises a reference voltage conversion module 21, an output voltage dividing module 22, a load monitoring module 23, a state calculating module 24, a state control module 25 and the like.
The adaptive integral sliding-mode controller 2 further includes a first input FBVI, a second input REF, a third input FBV, a fourth input FBC, and an output OUT; the first input end FBVI is connected to the output end of the input voltage V in of the conversion module, the second input end REF is connected to the output end of the reference voltage V ref of the man-machine interaction module, the third input end FBV is connected to the output end of the output voltage V o of the conversion module, the fourth input end FBC is connected to the output end of the output current I o of the conversion module, and the output end OUT is connected to the control end u of the conversion module.
The input end of the reference voltage conversion module 21 is connected with the second input end REF of the controller, and is used for converting the reference voltage V ref into a control reference signal V cref;
The input end of the output voltage dividing module 22 is connected with a third input end FBV of the controller, and is used for converting the output voltage V o into a control voltage signal V co; distributing resistance values of each series resistor according to the ratio of the maximum output voltage of the phase-shifting full-bridge conversion module to the maximum reference voltage signal of the self-adaptive sliding mode controller, carrying out voltage division by a series voltage division principle, and enabling the signals obtained after the voltage division to pass through a voltage follower to realize isolation of front and rear-stage circuits;
One input end of the load monitoring module 23 is connected with the third input end FBV of the controller, and the other input end is connected with the fourth input end FBC of the controller, and is used for obtaining a load resistance value R act so as to assist accurate calculation of the self-adaptive integral sliding mode control;
One input end of the state calculation module 24 is connected with the output end of the reference voltage division module 21 to obtain a control reference signal V cref, the other input end of the state calculation module is connected with the output end of the output voltage division module 22 to obtain a control voltage signal V co, the control voltage signal V co is used for obtaining three real-time state variables of the direct-current power supply, obtaining a state variable x 1 after differentiating the two inputs, obtaining a state variable x 2 after differentiating the state variable x 1, and obtaining a state variable x 3 after integrating the state variable x 1; the two inputs are subjected to difference, signals V co and V cref are input into a subtraction circuit to obtain a state variable x 1, the state variable x 1 is differentiated, the state variable x 1 is input into a differentiation circuit to obtain a state variable x 2, the state variable x 1 is integrated, and the state variable x 1 is input into an integration circuit to obtain a state variable x 3;
The three input ends of the state control module 25 are respectively connected with the three output ends of the state calculation module 24 to obtain real-time state variables x 1、x2 and x 3, the other two input ends are respectively connected with the FBVI end of the controller and the output end of the load monitoring module 23 to obtain input voltage V in and load resistance R act, and the control signal u is calculated according to the real-time state variable value by the self-adaptive integral sliding mode control method to realize the control of the phase-shifting full-bridge conversion module.
The state control module obtains a control quantity u by adopting the following control law:
Wherein V ref is reference voltage, V i is DC bus voltage, s is a switching equation, L lk is transformer leakage inductance, R' is equivalent resistance value of load reflected to primary side of full bridge, and f s is switching frequency.
The man-machine interaction module 3 comprises a first input end D V, a second input end D I, an output end of reference voltage V ref and the like.
The self-adaptive integral sliding mode control method comprises the following steps:
According to the integral sliding mode control method, the switching equation is selected to be s=α 1x1+α2x2+α3x3 (where, x 1＝Vref-vo, X 3＝∫x1,α1、α2 and alpha 3 are sliding coefficients to be designed), and the equivalent control law is obtained by an equivalent control methodWherein, alpha 1、α2 and alpha 3 are both sliding coefficients.
Because the phase-shifting full-bridge change module adopts a pulse width modulation method, the effect of integral terms in a switching equation is lost, so that the integral terms are required to be added into a control law to reduce the steady-state error of the system, and a new control law is designed as
By observing the new control law, it can be obtained that, when Control rhythms/>Simplifying the calculation process and re-observing the conditions, and enabling/>Alpha 2 = C and/>Further simplifying the calculation process.
Finally, the final control law is obtained by the relation between the phase-shifting full-bridge topology and the Buck topology
Referring to fig. 2, a phase-shifting full-bridge power control block diagram employing adaptive integral sliding mode control is provided. The phase-shifting full-bridge conversion module 1 comprises a first switching tube S1, a second switching tube S2, a third switching tube S3, a fourth switching tube S4, a PWM output chip OC, a switching tube driving module DM, a transformer T, a transformer leakage inductance L lk, a first diode D1, a second diode D2, an output inductance L, an output capacitor C, a load R and the like.
The positive electrode of the input voltage V in is respectively connected to the collectors of the first switching tube S1 and the third switching tube S3, the negative electrode is respectively connected to the emitters of the second switching tube S2 and the fourth switching tube S4, and energy is transmitted through the on and off states of the four switching tubes. The common termination of the switching tubes S1 and S2 is connected to one pin of the primary side of the transformer T, and the common termination of the switching tubes S3 and S4 is connected to the other pin of the primary side of the transformer T. The primary side of the transformer T is connected with four switching tubes, and the secondary side is respectively connected with diodes D1 and D2 and the ground, wherein leakage inductance of the transformer is centrally represented as L lk on the primary side. The anodes of the diodes D1 and D2 are respectively connected with two pins of the secondary side of the transformer T, and the cathodes are commonly connected to the output inductor L. One end of the output inductor L is connected with the cathodes of the two diodes, and the other end of the output inductor L is connected with the output capacitor C and the load R. One end of the output capacitor C is connected with the output inductor, and the other end of the output capacitor C is connected with the ground. The load R is connected in parallel with the output capacitance C. The input of the PWM output chip OC is connected with the control end d of the phase-shifting full-bridge conversion module, and the output of the PWM output chip OC is connected with the input of the switching tube driving module DM. The output of the switching tube driving module DM is respectively connected with the gates of the four switching tubes S1, S2, S3 and S4.
The input voltage V in, the output voltage V o, the current I o flowing through the load and the reference voltage V ref of the man-machine interaction module 3 of the phase-shifting full-bridge conversion module 1 are fed back to the self-adaptive integral sliding mode controller 2 after being sampled and used for calculating control signals. The input end of a PWM output chip in the phase-shifting full-bridge conversion module 1 is connected with the output end OUT of the self-adaptive integral sliding mode controller 2, the control quantity u is converted into a conduction phase difference of front and rear bridge arms of the full bridge, two groups of pulse waveforms with fixed frequency and duty ratio but phase difference change are output to the switching tube driving module, and the switching tubes on the front and rear bridge arms are turned on and off in different phases.
The specific derivation and demonstration steps of the adaptive integral sliding mode control signal u are as follows:
step 1, the state space equation of the phase-shifting full-bridge direct current converter based on the Buck converter small signal model is as follows
The actual duty ratio of the phase-shifting full-bridge DC converter is smaller than the ideal duty ratio because the secondary side duty ratio of the phase-shifting full-bridge DC converter is lost, and the relationship is that 1d is far smaller than a load power supply
Wherein L lk is leakage inductance of the transformer, R' is equivalent resistance value of load reflected to primary side of full bridge, and f s is switching frequency.
Thus, the phase-shifted full-bridge circuit topology can be reduced to a Buck circuit topology for calculation.
Step 2, using an integral sliding mode control method to make the difference between the set output voltage and the actual output be the state variable x 1, the derivative be the state variable x 2, and the integral be the state variable x 3, namely
The derivatives of the three state variables are
Determining the switching equation s as
s＝α1x1+α2x2+α3x3
In the formula, the sliding coefficient alpha 1＞0,α2＞0,α3 is more than 0
The derivative of the switching equation is
By equivalent control method, letThe equivalent control law u eq can be obtained as
It can be seen that there is no integral term in the equivalent control law, the integral term introduced by the integral sliding mode control method is only reflected in the sliding mode surface equation, and the switching frequency is fixed in the phase-shifting full-bridge topology, so that the effect of the integral term in the sliding mode surface is lost, and therefore, as the switching frequency is reduced, the output voltage error of the power supply is increased. However, in a practical high-power switching power supply, the switching frequency cannot be too high, otherwise the switching loss is increased, and the efficiency of the power supply is reduced. In order to reduce error, the invention adds integral term in control law to update control law u to
And step 3, checking the accessibility of the integral sliding mode control method under the condition of a new control law.
The new control law is substituted to the derivative of the sliding mode surface equation to obtain
Thus, the reachable conditions are
Where σ > 0.
Therefore, the reachability condition of the integral sliding mode control method is satisfied.
And step 4, checking the stability of the integral sliding mode control method under the condition of a new control law.
Let the sliding mode surface equation s=0 to obtain
After the Laplace transformation is carried out on the obtained product
After simplification, the characteristic equation is that
The stable condition is obtained by the Lawster criterion
Therefore, the stability condition of the integral sliding mode control method is satisfied.
And 5, determining the value of each sliding coefficient.
By equivalent control law whenAt the time, control law u has
The derivative of the sliding mode surface equation is
Thus can make
Therefore, the calculation is simplified, and the dynamic response performance of the integral sliding mode control method is improved.
Step 6, combining the relation between the phase-shifting full-bridge topology and the Buck topology duty ratio to obtain the control signal of the phase-shifting full-bridge power supply controlled by adopting an integral sliding mode as
On the other hand, the self-adaptive integral sliding mode controller also monitors the resistance value of the load in real time to obtain the latest load condition, so that the power supply has certain self-adaptability, and therefore, the control signal of the phase-shifting full-bridge power supply is updated to be
Referring to fig. 3, three state variables of the controller gradually move from an initial point to an origin. Starting from an initial point (40,0,0), the three state variables reach the vicinity of the plane of x 1 =0 rapidly, and then the phase trajectory gradually approaches the origin through the high-frequency rapid switching of x 2 and the gradual increase and decrease of x 3.
Referring to fig. 4, when the load of the phase-shifting full-bridge power supply suddenly changes during the working process, the transient response of the waveform change of the output voltage is very rapid, and the overshoot is small.
The invention relates to a self-adaptive integral sliding mode control method of a phase-shifting full-bridge power supply. The self-adaptive integral sliding mode control method is characterized in that an input voltage V in, an output voltage V o and an output current I o are obtained by sampling from a phase-shifting full-bridge conversion module, and a reference voltage V ref is obtained from a man-machine interaction module, so that three state variables x 1、x2 and x 3 in the integral sliding mode control method are calculated, meanwhile, the self-adaptability of the system is obtained by the input voltage V in, and the effect of the sliding mode control method is improved. In order to ensure that the integral term of the integral sliding mode control method still has a corresponding effect on the output error under the condition of a pulse width modulation method, the integral term is added into the control law, so that the output precision, the dynamic response performance and the robustness of the phase-shifting full-bridge power supply adopting the self-adaptive integral sliding mode control method are improved.
Example 2
When the direct-current power supply needs to output low-voltage light load, the input voltage V in of the phase-shifting full-bridge module can be reduced, so that ripple noise of the phase-shifting full-bridge module in light load operation is reduced. On the other hand, the adaptive integral sliding mode controller uses the input voltage V in as a feedback quantity to act on the calculation of the control quantity u, so that the output performance of the direct current power supply is not affected even when the input voltage changes.
Referring to fig. 5, it should be noted that, for the same reason, the input voltage V in does not significantly affect the output waveform even if it fluctuates significantly during operation.
Example 3
As one preferable mode, the man-machine interaction module of the embodiment includes an input module and an output module; the input module is connected with the output end of the reference voltage V ref, and the user inputs the output voltage value set by the direct current power supply; the output module is respectively connected with the first input end D V and the second input end D I and displays the output voltage value and the current value of the direct current power supply in real time.
The input module comprises a keyboard and a DA chip, when a user types in a set voltage value through the keyboard, the DA chip converts the set value into an analog quantity, and then the analog quantity is connected to a second input end REF of the self-adaptive integral sliding mode controller through an output end of a reference voltage V ref.
The output module comprises a display screen and an AD chip, when the first input end D V and the second input end D I of the man-machine interaction module acquire the output voltage V o and the output current I o of the phase-shifting full-bridge conversion module, the AD chip converts the output voltage V o and the output current I o into digital values and displays the digital values through the display screen
The man-machine interaction module of the direct-current power supply has good expansibility, and can be used as a mode selector for inputting a required output mode by a keyboard after a plurality of output modes are added into the direct-current power supply, and the display screen displays the output mode currently being executed, so that the diversified output function of the direct-current power supply is reserved.
The preferred embodiments of the invention disclosed above are intended only to assist in the explanation of the invention. The preferred embodiments are not exhaustive or to limit the invention to the precise form disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best understand and utilize the invention. The invention is limited only by the claims and the full scope and equivalents thereof.
Claims (7)
1. The utility model provides a phase shift full bridge power of adoption self-adaptation integral sliding mode control which characterized in that includes: the system comprises a phase-shifting full-bridge conversion module, a self-adaptive integral sliding mode controller and a man-machine interaction module;
The phase-shifting full-bridge conversion module comprises an input voltage V in output end, an output voltage V o output end, an output current I o output end and a control end d;
The self-adaptive integral sliding mode controller comprises a first input end FBVI, a second input end REF, a third input end FBV, a fourth input end FBC and an output end OUT;
The first input end FBVI is connected with an input voltage V in output end, the second input end REF is connected with a reference voltage V ref output end of the man-machine interaction module, the third input end FBV is connected with an output end of the output voltage V o, the fourth input end FBC is connected with an output end of the output current I o, and the output end OUT is connected with the control end d;
The self-adaptive integral sliding mode controller is used for determining the working state of the phase-shifting full-bridge conversion module according to the acquired input voltage V in, reference voltage V ref, output voltage V o and output current I o, and further calculating and outputting a control quantity u by adopting a self-adaptive integral sliding mode control method;
the man-machine interaction module comprises a first input end D V, a second input end D I and a reference voltage V ref output end;
The adaptive integral sliding mode controller further comprises:
The input end of the reference voltage conversion module is connected with the second input end REF and is used for converting the reference voltage V ref into a control reference signal V cref, converting the reference voltage given by the man-machine interaction module into a corresponding reference signal, and outputting the control reference signal V cref after isolation and filtration;
The input end of the output voltage dividing module is connected with the third input end FBV and is used for converting the output voltage V o into a control voltage signal V co, voltage dividing is carried out by distributing each series resistance value according to the ratio of the maximum output voltage of the phase-shifting full-bridge conversion module to the maximum reference voltage signal of the self-adaptive integral sliding mode controller, and the signals obtained after voltage dividing pass through a voltage follower to realize the isolation of front and rear-stage circuits;
The load monitoring module is provided with one input end connected with the third input end FBV and the other input end connected with the fourth input end FBC, and is used for obtaining a load resistance value R;
The state calculation module is provided with one input end connected with the output end of the reference voltage conversion module to obtain a control reference signal V cref, the other input end connected with the output end of the output voltage division module to obtain a control voltage signal V co, the control voltage signal V co is used for obtaining three real-time state variables of the direct-current power supply, obtaining a state variable x 1 after difference is obtained between the two inputs, obtaining a state variable x 2 after differentiation of the state variable x 1, and obtaining a state variable x 3 after integration of the state variable x 1;
The three input ends of the state control module are respectively connected with the three output ends of the state calculation module to obtain real-time state variables x 1、x2 and x 3, the other two input ends of the state control module are respectively connected with the first input end FBVI and the output end of the load monitoring module to obtain input voltage V in and load resistance R, and the control quantity u is calculated according to the self-adaptive integral sliding mode control method and the state variable real-time value to realize the control of the phase-shifting full-bridge conversion module;
The self-adaptive integral sliding mode control method comprises the following steps:
according to the integral sliding mode control method, selecting a switching equation s as follows:
s＝α1x1+α2x2+α3x3
In which the state variable x 1＝Vref-vo, X 3＝∫x1,Vref is the reference voltage, v o is the actual output voltage of the power supply,In a differentiated form of state variable x 1;
the equivalent control law u eq is obtained by an equivalent control method as follows:
Wherein, alpha 1、α2 and alpha 3 are both sliding coefficients, L is an output inductance, C is an output capacitance, v i is an input voltage, and R is a load resistance;
adding integral term in control law, then new control law u is:
When (when) There is control law/>Let/>Alpha 2 = C and/>Finally, the final control law is obtained by the relation between the phase-shifting full-bridge topology and the Buck topology:
v ref is the reference voltage, V i is the dc bus voltage, s is the switching equation, L lk is the transformer leakage inductance, R' is the equivalent resistance of the load reflected to the primary side of the full bridge, and f s is the switching frequency.
2. The phase-shifting full-bridge power supply adopting adaptive integral sliding mode control according to claim 1, wherein the phase-shifting full-bridge power supply is characterized in that: the phase-shifting full-bridge conversion module further comprises a first switching tube, a second switching tube, a third switching tube, a fourth switching tube, a switching tube driving module, a PWM output chip, a transformer leakage inductance, a first diode, a second diode, an output inductance, an output capacitance and a load; the input of the PWM output chip is connected with the control end d of the phase-shifting full-bridge conversion module, and the output of the PWM output chip is connected with the input of the switching tube driving module; the output of the switching tube driving module is respectively connected with the gates of the four switching tubes; the positive electrode of the input voltage V in is respectively connected to the collectors of the first switching tube and the third switching tube, the negative electrode is respectively connected to the emitters of the second switching tube and the fourth switching tube, and energy is transmitted through the on and off states of the four switching tubes; the common end of the first switching tube and the second switching tube is connected with one pin of the primary side of the transformer, and the common end of the third switching tube and the fourth switching tube is connected with the other pin of the primary side of the transformer; the primary side of the transformer is connected with four switching tubes, and the secondary side of the transformer is respectively connected with a first diode, a second diode and the ground, wherein leakage inductance of the transformer is intensively represented as transformer leakage inductance of the primary side; the anodes of the first diode and the second diode are respectively connected with two pins of the secondary side of the transformer, and the cathodes are commonly connected to the output inductor; one end of the output inductor is connected with the cathodes of the two diodes, and the other end of the output inductor is connected with the output capacitor and the load; one end of the output capacitor is connected with the output inductor, and the other end of the output capacitor is connected with the ground; the load is connected in parallel with the output capacitance.
3. The phase-shifting full-bridge power supply adopting adaptive integral sliding mode control according to claim 2, wherein the phase-shifting full-bridge power supply is characterized in that: the PWM output chip of the phase-shifting full-bridge conversion module converts the control quantity u into a conduction phase difference of front and rear bridge arms of the full bridge, so that two groups of pulse waveforms with fixed frequency and duty ratio and phase difference change are output to the switching tube driving module, and the switching tubes on the front and rear bridge arms are turned on and off in different phases.
4. The phase-shifting full-bridge power supply adopting adaptive integral sliding mode control according to claim 1, wherein the phase-shifting full-bridge power supply is characterized in that: the input voltage V in, the output voltage V o, the current I o flowing through the load and the set voltage V ref of the man-machine interaction module of the phase-shifting full-bridge conversion module are fed back to the self-adaptive integral sliding mode controller after being sampled and used for calculating the control quantity u.
5. A phase-shifting full-bridge power supply employing adaptive integral sliding mode control as claimed in any one of claims 1 to 4, wherein: the man-machine interaction module further comprises an input module and an output module; the input module is connected with the output end of the reference voltage V ref, and the user inputs the output voltage value set by the direct current power supply; the output module is respectively connected with the first input end D V and the second input end D I and displays the output voltage value and the current value of the direct current power supply in real time.
6. The phase-shifting full-bridge power supply employing adaptive integral sliding mode control according to claim 5, wherein: the input module comprises a keyboard and a DA chip, when a user types in a set voltage value through the keyboard, the DA chip converts the set value into an analog quantity, and then the analog quantity is connected to a second input end REF of the self-adaptive integral sliding mode controller through an output end of a reference voltage V ref.
7. The phase-shifting full-bridge power supply adopting the self-adaptive integral sliding mode control according to claim 5, wherein the output module comprises a display screen and an AD chip, and when the first input end D V and the second input end D I of the man-machine interaction module acquire the output voltage V o and the output current I o of the phase-shifting full-bridge conversion module, the output voltage V o and the output current I o are converted into digital values by the AD chip and displayed by the display screen.
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