CN112865521A - Active damping control method and system for constant-power load system of Buck converter - Google Patents
Active damping control method and system for constant-power load system of Buck 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
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
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Abstract
The invention discloses an active damping control method and system for a constant power load system of a Buck converter, wherein the method comprises the following steps: collecting the inductive current and the capacitive voltage of the Buck converter, and outputting a PWM (pulse-width modulation) switch control signal after being controlled by a voltage outer ring and a current inner ring; acquiring an inductive current signal of the Buck converter, and outputting an active damping injection duty ratio signal after active damping compensation; and obtaining the optimized duty ratio signal of the switching tube of the Buck converter according to the PWM switching control signal and the active damping injection duty ratio signal. The invention solves the problem of poor damping characteristic and dynamic response characteristic in the traditional constant power load system control method, so that the system can be quickly adjusted when the system is subjected to disturbance such as bus voltage adjustment, load sudden change and the like, and the stability of the system is maintained.
Description
Technical Field
The invention relates to the technical field of power electronic control, in particular to an active damping control method and system for a constant-power load system of a Buck converter.
Background
The distributed cascade structure has the advantages of high precision, high efficiency, low noise and the like, and is widely applied to the fields of aerospace power supply systems, computer communication systems, ship power supply systems, photovoltaic power generation systems and the like. In a cascade system, a high-bandwidth closed-loop controlled rear-stage load converter often has obvious constant-power load characteristics. The constant power load shows a negative resistance characteristic, which reduces the damping of the system, thereby affecting the stability of the cascade system.
For the stability problem caused by the constant power load, the existing solutions are as follows: 1) the passive damping method is that resistors are connected in series or in parallel in a loop to increase the damping of the system, so that the stability of the system is improved; 2) the active damping method is characterized in that equivalent virtual resistance is introduced in a control mode, and the effect of improving the system damping is achieved. The passive damping method adds extra hardware and volume, and the compensation resistor generates loss, which is not favorable for improving the power density and efficiency of the system. The active damping method overcomes the above disadvantages of the passive damping method, and thus has received much attention.
The existing Buck converter constant power load system is generally a control scheme based on single voltage ring + active damping compensation, the control scheme can realize stable control of the system, but the value of a compensated virtual resistor is often limited within a certain range due to the requirement of system stability, so that the influence on the distribution of the zero pole of the system is relatively limited, and the damping characteristic and the dynamic response characteristic of the system are still poor.
Disclosure of Invention
The invention aims to overcome the defects and shortcomings of the prior art, provides an active damping control method and system for a Buck converter constant power load system, solves the problem that the damping characteristic and the dynamic response characteristic are poor in the traditional constant power load system control method, enables the system to be rapidly adjusted when disturbance such as bus voltage adjustment and load sudden change is faced, and maintains the stability of the system.
The invention provides an active damping control method for a constant-power load system of a Buck converter, which comprises the following steps: collecting the inductive current and the capacitive voltage of the Buck converter, and outputting a PWM (pulse-width modulation) switch control signal after being controlled by a voltage outer ring and a current inner ring; acquiring an inductive current signal of the Buck converter, and outputting an active damping injection duty ratio signal after active damping compensation; and obtaining the optimized duty ratio signal of the switching tube of the Buck converter according to the PWM switching control signal and the active damping injection duty ratio signal.
Further, the voltage outer loop control method comprises: collecting the capacitance voltage of the Buck converter; comparing the capacitor voltage of the Buck converter with a voltage reference value to obtain an error signal of a voltage outer ring; and the error signal of the voltage outer ring is regulated by a PI compensator of the voltage outer ring to obtain a current reference value of the current inner ring.
Further, the current inner loop control method comprises the following steps: collecting the inductive current of the Buck converter; comparing the inductive current of the Buck converter with the current reference value of the current inner ring to obtain an error signal of the current inner ring; and the error signal of the current inner ring is regulated by a PI compensator of the current inner ring to obtain a PWM switch control signal.
Further, the active damping compensation method comprises the following steps: filtering an inductive current signal of the Buck converter by a high-pass filter to obtain a high-frequency harmonic component of the inductive current; and multiplying the high-frequency harmonic component of the obtained inductive current by the active damping proportionality coefficient to obtain an active damping injection duty ratio signal.
In a second aspect, the present invention provides an active damping control system for a Buck converter constant power load system, the system comprising: the signal acquisition module is used for acquiring the inductive current and the capacitive voltage of the Buck converter; the voltage outer ring control module is used for comparing the capacitor voltage of the Buck converter with a voltage reference value to obtain an error signal of a voltage outer ring; the error signal of the voltage outer ring is adjusted by a PI compensator of the voltage outer ring to obtain a current reference value of the current inner ring; the current inner ring control module is used for comparing the inductive current of the Buck converter with a current reference value of the current inner ring to obtain an error signal of the current inner ring; the error signal of the current inner ring is regulated by a PI compensator of the current inner ring to obtain a PWM switch control signal; the compensation module is used for filtering an inductive current signal of the Buck converter through a high-pass filter to obtain a high-frequency harmonic component of the inductive current; multiplying the obtained high-frequency harmonic component of the inductive current by an active damping proportionality coefficient to obtain an active damping injection duty ratio signal; and the calculation module is used for obtaining the optimized duty ratio signal of the switching tube of the Buck converter according to the PWM switching control signal and the active damping injection duty ratio signal.
Compared with the prior art, the invention has the beneficial effects that:
(1) the invention takes the output voltage of the previous-stage Buck converter as a control target, realizes the control of a constant-power load system of the Buck converter by sampling the inductive current and the capacitor voltage, adopting the current-voltage double closed-loop control and injecting active damping.
(2) The invention further improves the damping characteristic of the system on the basis of ensuring the stable work of the system, improves the dynamic response of the system, and realizes the effect of improving the damping of the system without adding additional devices.
(3) The invention adds the control of the current loop, can realize the current limiting function to the output current of the preceding converter, prevents the load from being damaged due to overlarge current, and plays a role in system protection.
Drawings
For purposes of illustration and not limitation, the present invention will now be described in accordance with its preferred embodiments, particularly with reference to the accompanying drawings, in which:
FIG. 1 is a schematic diagram illustrating the negative impedance characteristic of the constant power load according to the first embodiment;
FIG. 2 is a flow chart of an active damping control method for a constant-power load system of a Buck converter disclosed in the first embodiment;
FIG. 3 is a control block diagram of a constant power load system of the Buck converter in operation according to the first embodiment;
FIG. 4 is a block diagram of the current-voltage dual closed loop control mentioned in the first embodiment;
FIG. 5 is a plot of the PI compensator scaling factor for the voltage outer loop as positive in the first embodiment;
FIG. 6 is a plot of the PI compensator scaling factor for the voltage outer loop as negative in the first embodiment;
FIG. 7 is a plot of the PI compensator scaling factor for the current inner loop as positive in the first embodiment;
FIG. 8 is a plot of the root traces of the PI compensator with negative proportionality coefficient for the current inner loop as mentioned in the first embodiment;
fig. 9 is a block diagram of the structure of the active damping control system for the constant-power load system of the Buck converter disclosed in the second embodiment.
Detailed Description
In order that the above objects, features and advantages of the present invention can be more clearly understood, a detailed description of the present invention will be given below with reference to the accompanying drawings and specific embodiments. It should be noted that the embodiments of the present invention and features of the embodiments may be combined with each other without conflict.
In the following description, numerous specific details are set forth to provide a thorough understanding of the present invention, and the described embodiments are merely a subset of the embodiments of the present invention, rather than a complete embodiment. 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.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.
Example one
The constant power load system of the Buck converter comprises a front-stage Buck converter, a rear-stage load converter and a load Ro。
Wherein, in the pre-stage Buck converter, usIs input voltage, L is filter inductance, RLThe inductance branch circuit is equivalent series resistance, and C is a filter capacitor.
The load converter of the subsequent stage is a high-bandwidth closed-loop controlled load converter, load converter andload RoThe input voltage and current characteristic curve of the post-stage load converter can be regarded as a constant power load, as shown in fig. 1, the constant power load has a negative impedance characteristic, and an equivalent resistance expression under a small signal model is as follows:
the invention provides an active damping control method for a constant-power load system of a Buck converter, aiming at solving the technical problem of poor damping characteristic and dynamic response characteristic in the existing control method for the constant-power load system of the Buck converter. The following describes an embodiment of the present invention by taking the Buck converter constant power load system as an example.
Referring to fig. 2, the active damping control method for the constant power load system of the Buck converter includes the following steps:
s101, collecting an inductive current i of a preceding-stage Buck converterLAnd the capacitor voltage uoAfter being controlled by the voltage outer ring and the current inner ring, the PWM switch control signal d is outputo。
Specifically, referring to fig. 3, in the step S101, the voltage outer loop control method specifically includes:
(11) capacitor voltage u of pre-stage Buck converter is gatheredo；
(12) Converting the capacitor voltage u of the pre-stage Buck converteroAnd a voltage reference value urefComparing to obtain an error signal of the voltage outer ring;
(13) the error signal of the voltage outer ring is adjusted by a PI compensator of the voltage outer ring to obtain a current reference value i of the current inner ringref。
The expression of the PI compensator of the voltage outer loop in the step (13) is as follows:
wherein k isvpPI compensation for voltage outer loopThe proportionality coefficient of the device; k is a radical ofviThe integral coefficient of a PI compensator of the voltage outer ring; gvpiA PI compensator of the voltage outer loop.
Different from the traditional PI compensator, in order to realize the stable control of the constant power load system of the Buck converter, in the step (13), the proportional coefficient of the voltage outer loop PI compensator is negative.
If the capacitor voltage u is adoptedoPositive feedback and subtraction of a voltage reference urefAs the voltage outer loop error signal, the proportionality coefficient of the voltage outer loop PI compensator in the step (13) is positive.
Specifically, referring to fig. 3, in the step S101, the current inner loop control method specifically includes:
(21) collecting inductive current i of preceding-stage Buck converterL；
(22) Converting the inductive current i of the pre-stage Buck converterLAnd the current reference value i obtained in the step (13) aboverefComparing to obtain an error signal of the current inner ring;
(23) the error signal of the current inner loop is regulated by the PI compensator of the current inner loop to obtain a PWM switch control signal do。
The above PI compensator expression for the current inner loop is as follows:
wherein k iscpThe proportionality coefficient of the PI compensator which is the current inner loop; k is a radical ofciThe integral coefficient of a PI compensator of the current inner loop; gcpiA PI compensator which is an inner loop of current.
Different from the conventional PI compensator, in order to realize stable control of the constant power load system of the Buck converter, in the step (23), the proportional coefficient of the current inner loop PI compensator is negative.
If an inductive current i is adoptedLPositive feedback and subtraction of a current reference value irefAs the current inner loop error signal, the proportionality coefficient of the current inner loop PI compensator takes a positive number.
Step S102, collecting an inductive current signal i of a preceding-stage Buck converterLAnd outputs active damping injection duty ratio signal d after active damping compensationAD。
Specifically, referring to fig. 3, in the step S102, the specific method of active damping compensation includes:
firstly, an inductive current signal i is providedLObtaining the high-frequency harmonic component of the inductive current by a high-pass filter HPF
Then, the high-frequency harmonic component of the obtained inductive current is measured
Multiplying the scaling factor
Obtaining an active damping injection duty ratio signal dADWherein R isLInductance branch resistance u for equivalent compensationsThe input voltage of the Buck converter is obtained.
In order to stabilize a constant power load system of the Buck converter, an equivalent series resistance R of an inductance branchLThe requirements to be met are as follows:
wherein L is an inductor; c is a filter capacitor; rCPLRepresenting a constant power load small signal equivalent resistance (negative).
Step S103, according to the PWM switch control signal doAnd active damping injection duty cycle signal dADAnd obtaining the optimized duty ratio signal d of the switching tube of the Buck converter.
Specifically, a duty ratio signal d of a switching tube of the Buck converter is obtained by subtracting an active damping injection duty ratio signal d from a control signal do output by a current inner loop PI compensatorADI.e. d ═ do-dAD。
In an embodiment, the method for designing the PI compensator of the voltage outer loop in step (13) includes:
(13-1) constructing a transfer function of the inductive current-capacitive voltage.
Firstly, in order to analyze the stability and the dynamic property of the constant-power load system of the Buck converter, the constant-power load system of the Buck converter needs to be modeled. The system state variable is the capacitance voltage u of the preceding-stage Buck converteroThe input variable being the duty cycle ucAnd averaging the switching period of the capacitance voltage calculation formula to obtain a state equation of the system:
after the state equation is subjected to Laplace transform, a transfer function of inductance current-capacitance voltage is obtained:
(13-2) designing a voltage outer ring.
The double closed-loop control (current inner loop and voltage outer loop) of the traditional converter with a resistive load is widely applied, but when the converter is provided with a constant-power load, the negative resistance characteristic of the constant-power load has no clear influence on the closed-loop control, and further analysis is needed.
Assuming that the response speed of the voltage outer loop of the constant-power load system of the Buck converter is much smaller than that of the current inner loop, the current inner loop and the voltage outer loop can be designed separately, and a control block diagram of the double closed-loop control of the current inner loop and the voltage outer loop of the constant-power load system of the Buck converter is shown in fig. 4, wherein the general forms of the transfer functions of the PI compensator and the low-pass filter are as follows:
wherein k ispIs the proportionality coefficient, k, of the PI compensatoriAnd tau is a delay coefficient corresponding to the low-pass filter and is an integral coefficient of the PI compensator.
From the analysis of the control logic, when the converter is connected with a constant power load, the inductance current i of the Buck converterLAnd the capacitor voltage uoIs inversely proportional, so that only the proportionality coefficient k in the PI compensator is usedpThe voltage loop can be controlled to work stably only by changing the voltage loop into a negative number.
From the theoretical analysis, as can be seen from fig. 4, the controlled object of the voltage loop is the current inner loop closed loop transfer function Giref_iLAnd transfer function G of inductor current-capacitor voltageiL_uoThe product of the two coefficients is used for drawing the root track of the system and the proportionality coefficient k in the PI compensator of the voltage outer ringpThe root trace of the system when taken as positive or negative is shown in fig. 5 and 6, respectively. It is easy to find if kpTaking positive, the system always has a closed-loop pole located in the right half-plane, i.e. the system cannot be stabilized, so k needs to be adjustedpTaking a negative number.
In an embodiment, the method for designing the PI compensator of the current inner loop in step (23) includes:
(23-1) constructing a transfer function of the duty ratio and the inductance current.
Firstly, in order to analyze the stability and the dynamic property of the constant-power load system of the Buck converter, the constant-power load system of the Buck converter needs to be modeled. The system state variable is the inductive current i of the preceding-stage Buck converterLThe input variable being the duty cycle ucAnd after the average switching period is taken for the inductance current calculation formula, the state equation of the system is obtained:
after the state equation is subjected to Laplace transform, a transfer function of a duty ratio-an inductive current is obtained:
(23-2) designing a current inner ring.
The expressions for the PI compensator and low pass filter transfer functions of the system current inner loop are as described in equations (7) and (8) above.
From the point of view of control logic analysis, Buck converter duty ratio signal ucAnd the capacitor voltage uoProportional, when the converter is connected to a resistive load, uo/ioConstant, so the duty cycle is inversely proportional to the inductor current; and when the converter is connected with a constant power load, uoioConstant, so the duty cycle is proportional to the inductor current, so only the proportionality factor k in the PI compensator is usedpThe current loop can be controlled to work stably only by changing the current loop into a negative number.
From a theoretical point of view, the controlled object of the current loop is Guc_iLAccording to the equation (10), the negative impedance characteristic of the constant power load enables the controlled object to have a zero point located on the right half plane, and the proportional coefficient k in the PI compensator of the root locus and the current inner loop of the system is drawnpThe root trace of the system when positive or negative is taken is shown in fig. 7 and 8, respectively. It is easy to find if kpTaking positive, the system always has a closed-loop pole located in the right half-plane, i.e. the system cannot be stabilized, so k needs to be adjustedpTaking a negative number.
According to the active damping control method, the effect of improving the system damping is achieved without adding extra devices, the output voltage of the front-stage Buck converter is used as a control target, a voltage and current double closed-loop control structure is adopted, the constant-power load system of the Buck converter is controlled on the basis of active damping injection through sampling of inductive current and capacitive voltage, the damping characteristic of the system is further improved on the basis of ensuring the stable work of the system, and the dynamic response of the system is improved.
The active damping control method increases the control of the current loop, can realize the current limiting function on the output current of the pre-stage converter, prevents the load from being damaged due to overlarge current, and plays a role in system protection.
Example two
The embodiment provides an active damping control system for a constant-power load system of a Buck converter. As shown in fig. 9, the active damping control system 200 for the constant-power load system of the Buck converter includes a signal acquisition module 201, a voltage outer loop control module 202, a current inner loop control module 203, a compensation module 204, and a calculation module 205.
The signal acquisition module 201 is used for acquiring an inductive current i of the preceding-stage Buck converterLAnd the capacitor voltage uo。
In a preceding Buck converter, usIs input voltage, L is filter inductance, RLThe inductance branch circuit is equivalent series resistance, and C is a filter capacitor. Inductive current i of preceding-stage Buck converter is acquired through signal acquisition module 201LAnd the capacitor voltage uoAnd are respectively transmitted to the voltage outer loop control module 202, the current inner loop control module 203 and the active damping control module 204.
The voltage outer loop control module 202 is used for converting the capacitance voltage u of the pre-stage Buck converteroAnd a voltage reference value urefComparing to obtain an error signal of the voltage outer ring; the error signal of the voltage outer ring is adjusted by a PI compensator of the voltage outer ring to obtain a current reference value i of the current inner ringrefAnd the current reference value i of the current inner loop is usedrefTo the current inner loop control module 203.
The current inner loop control module 203 is used for controlling the inductive current i of the pre-stage Buck converterLAnd the current reference value i obtained in the step (13) aboverefComparing to obtain an error signal of the current inner ring; the error signal of the current inner loop is regulated by the PI compensator of the current inner loop to obtain a PWM switch control signal doAnd the PWM switch control signal doTo the active damping control module 204.
Wherein, the compensation module 204 is used for converting the inductive current signal iLObtaining the high-frequency harmonic component of the inductive current by a high-pass filter HPF
The high-frequency harmonic component of the obtained inductive current
Multiplying the scaling factor
Obtaining an active damping injection duty ratio signal dADWherein R isLInductance branch resistance u for equivalent compensationsThe input voltage of the Buck converter is obtained.
Wherein, the computing module 205 is used for outputting the control signal d output by the current inner loop PI compensatoroSubtracting the active damping injection signal dADAnd obtaining the optimized duty ratio signal d of the switching tube of the Buck converter.
According to the active damping control system, the effect of improving the system damping is realized without adding extra devices, the output voltage of the front-stage Buck converter is taken as a control target, a voltage and current double closed-loop control structure is adopted, the constant-power load system control of the Buck converter is realized through sampling of inductive current and capacitive voltage and based on active damping injection, the damping characteristic of the system is further improved on the basis of ensuring the stable work of the system, and the dynamic response of the system is improved.
The above-described embodiments should not be construed as limiting the scope of the invention. Those skilled in the art will appreciate that various modifications, combinations, sub-combinations, and substitutions can occur, depending on design requirements and other factors. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (9)
1. An active damping control method for a constant-power load system of a Buck converter is characterized by comprising the following steps:
collecting the inductive current and the capacitive voltage of the Buck converter, and outputting a PWM (pulse-width modulation) switch control signal after being controlled by a voltage outer ring and a current inner ring;
acquiring an inductive current signal of the Buck converter, and outputting an active damping injection duty ratio signal after active damping compensation;
and obtaining the optimized duty ratio signal of the switching tube of the Buck converter according to the PWM switching control signal and the active damping injection duty ratio signal.
2. The active damping control method for the Buck converter constant power load system according to claim 1, wherein the voltage outer loop control method is as follows:
collecting the capacitance voltage of the Buck converter;
comparing the capacitor voltage of the Buck converter with a voltage reference value to obtain an error signal of a voltage outer ring;
and the error signal of the voltage outer ring is regulated by a PI compensator of the voltage outer ring to obtain a current reference value of the current inner ring.
3. The active damping control method for the constant-power load system of the Buck converter as claimed in claim 2, wherein the expression of the PI compensator of the voltage outer loop is as follows:
wherein k isvpThe proportionality coefficient of the PI compensator of the voltage outer ring; k is a radical ofviThe integral coefficient of a PI compensator of the voltage outer ring; gvpiA PI compensator of the voltage outer loop.
4. The active damping control method for the Buck converter constant-power load system according to claim 2, wherein the current inner loop control method is as follows:
collecting the inductive current of the Buck converter;
comparing the inductive current of the Buck converter with the current reference value of the current inner ring to obtain an error signal of the current inner ring;
and the error signal of the current inner ring is regulated by a PI compensator of the current inner ring to obtain a PWM switch control signal.
5. The active damping control method for the Buck converter constant power load system as recited in claim 4, wherein the expression of the PI compensator of the current inner loop is as follows:
wherein k iscpThe proportionality coefficient of the PI compensator which is the current inner loop; k is a radical ofciThe integral coefficient of a PI compensator of the current inner loop; gcpiA PI compensator which is an inner loop of current.
6. The active damping control method for the constant-power load system of the Buck converter according to claim 1, wherein the active damping compensation method is as follows:
filtering an inductive current signal of the Buck converter by a high-pass filter to obtain a high-frequency harmonic component of the inductive current;
and multiplying the high-frequency harmonic component of the obtained inductive current by the active damping proportionality coefficient to obtain an active damping injection duty ratio signal.
7. The active damping control method for the constant-power load system of the Buck converter according to claim 6, wherein the active damping proportionality coefficient is a ratio of equivalent compensated inductance branch resistance to Buck converter input voltage; the equivalent compensation inductance branch resistance satisfies the following conditions:
wherein L is an inductor; c is a filter capacitor; rCPLRepresenting constant power load small signal equivalent resistance；RLThe equivalent compensated inductance branch resistance.
8. The active damping control method for the Buck converter constant-power load system according to claim 7, wherein the duty cycle signal of the Buck converter switching tube is calculated by subtracting the active damping injection duty cycle signal from the control signal output by the current inner loop PI compensator.
9. An active damping control system for a Buck converter constant power load system, comprising:
the signal acquisition module is used for acquiring the inductive current and the capacitive voltage of the Buck converter;
the voltage outer ring control module is used for comparing the capacitor voltage of the Buck converter with a voltage reference value to obtain an error signal of a voltage outer ring; the error signal of the voltage outer ring is adjusted by a PI compensator of the voltage outer ring to obtain a current reference value of the current inner ring;
the current inner ring control module is used for comparing the inductive current of the Buck converter with a current reference value of the current inner ring to obtain an error signal of the current inner ring; the error signal of the current inner ring is regulated by a PI compensator of the current inner ring to obtain a PWM switch control signal;
the compensation module is used for filtering an inductive current signal of the Buck converter through a high-pass filter to obtain a high-frequency harmonic component of the inductive current; multiplying the obtained high-frequency harmonic component of the inductive current by an active damping proportionality coefficient to obtain an active damping injection duty ratio signal;
and the calculation module is used for obtaining the optimized duty ratio signal of the switching tube of the Buck converter according to the PWM switching control signal and the active damping injection duty ratio signal.
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| CN112865521B (en) | 2022-03-29 |
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