CN114172369A - Control method and device of Boost converter, power supply and storage medium - Google Patents
Control method and device of Boost converter, power supply and storage medium Download PDFInfo
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- CN114172369A CN114172369A CN202111470748.4A CN202111470748A CN114172369A CN 114172369 A CN114172369 A CN 114172369A CN 202111470748 A CN202111470748 A CN 202111470748A CN 114172369 A CN114172369 A CN 114172369A
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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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- 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
- H02M1/00—Details of apparatus for conversion
- H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
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Abstract
The invention discloses a control method, a control device, a power supply and a storage medium of a Boost converter, wherein the method comprises the following steps: sampling input voltage, output voltage, inductance value and inductance current parameters; determining a current change parameter according to the input voltage, the output voltage and the inductance value; according to a given reference voltage and an output voltage, obtaining a reference current by adopting fractional order PID control; according to the inductive current parameter, the current change parameter and the reference current, adopting a leading edge modulation prediction mean current mode to control to obtain the duty ratio of the switching device; and determining the periodic pulse signal of the switching device according to the duty ratio of the switching device. According to the scheme, the delay of a current loop in the current mode control of the Boost converter is reduced by adopting a leading edge modulation prediction mean value current mode control strategy, and the reliability of the current mode control of the Boost converter is improved.
Description
Technical Field
The invention belongs to the technical field of power supplies, and particularly relates to a control method and device of a Boost converter, a power supply and a storage medium, in particular to a leading edge modulation prediction mean current control method and device of the Boost converter, the power supply and the storage medium.
Background
A Boost converter (i.e., Boost chopper circuit), also known as Boost circuit, is a switching dc Boost circuit, which can make the output voltage higher than the input voltage, and is mainly applied to dc motor transmission, single-phase Power Factor Correction (PFC) circuits and other ac/dc power supplies.
The current mode control of the Boost converter has the advantages of fast dynamic response, high bandwidth, simple compensation design, strong input voltage disturbance resistance, overcurrent protection and the like, and is widely applied. However. In the current mode control of the Boost converter, the delay of current sampling affects the reliability of the current mode control of the Boost converter.
The above is only for the purpose of assisting understanding of the technical aspects of the present invention, and does not represent an admission that the above is prior art.
Disclosure of Invention
The invention aims to provide a control method, a control device, a power supply and a storage medium of a Boost converter, which are used for solving the problem that the reliability of the current mode control of the Boost converter is influenced by the delay of current sampling in the current mode control of the Boost converter, achieving the effect of reducing the delay of a current loop in the current mode control of the Boost converter by adopting a leading edge modulation prediction mean value current mode control strategy and being beneficial to improving the reliability of the current mode control of the Boost converter.
The invention provides a control method of a Boost converter, wherein the Boost converter adopts double-ring control consisting of an inner ring and an outer ring; the inner ring is a current ring, and the current ring is controlled by adopting a leading edge modulation prediction mean current mode; the outer ring is a voltage ring, and the voltage ring is controlled by fractional order PID; the control method of the Boost converter comprises the following steps: sampling input voltage, output voltage, an inductance value and an inductance current parameter of the Boost converter; determining a current change parameter of the Boost converter according to the input voltage, the output voltage and the inductance value; obtaining the reference current of the Boost converter by adopting fractional order PID control according to a given reference voltage and the output voltage; according to the inductance current parameter, the current change parameter and the reference current, adopting a leading edge modulation prediction mean value current mode to control to obtain the duty ratio of a switching device in the Boost converter; and determining a periodic pulse signal of the switching device according to the duty ratio of the switching device, so as to control the switching device to act according to the periodic pulse signal of the switching device.
In some embodiments, the current variation parameter comprises: a current rising slope and a current falling slope; determining a current variation parameter of the Boost converter according to the input voltage, the output voltage and the inductance value, including: determining a ratio of the input voltage to the inductance value as a current rising slope of the Boost converter; and determining the ratio of the difference value of the input voltage and the output voltage to the inductance value as the current reduction slope of the Boost converter.
In some embodiments, obtaining the reference current of the Boost converter by using fractional order PID control according to a given reference voltage and the output voltage includes: determining a deviation value between the reference voltage and the output voltage according to a given reference voltage and the output voltage; and carrying out fractional order PID control on the deviation value to obtain the reference current of the Boost converter.
In some embodiments, the inductor current parameter comprises: peak value of the inductive current and mean value of the inductive current; according to the inductance current parameter, the current change parameter and the reference current, adopting a leading edge modulation prediction mean value current mode control to obtain the duty ratio of a switching device in the Boost converter, and comprising the following steps: adjusting the average value of the inductive current of the Boost converter in the k +1 th period to the reference current; and under the condition that the current change parameters comprise a current rising slope and a current falling slope and the peak value of the inductive current of the Boost converter in the k-th period is known, determining the duty ratio of the switching device in the k + 1-th period according to the peak value of the inductive current of the k-th period, the current rising slope, the current falling slope and the duty ratio of the switching device in the k-th period.
In some embodiments, determining the periodic pulse signal of the switching device according to the duty cycle of the switching device includes: and carrying out PWM modulation on the duty ratio of the switching device to obtain a periodic pulse signal of the switching device.
In another aspect, the present invention provides a control apparatus for a Boost converter, wherein the Boost converter is controlled by a dual-loop formed by an inner loop and an outer loop; the inner ring is a current ring, and the current ring is controlled by adopting a leading edge modulation prediction mean current mode; the outer ring is a voltage ring, and the voltage ring is controlled by fractional order PID; a control device for a Boost converter, comprising: a sampling unit configured to sample an input voltage, an output voltage, an inductance value, and an inductance current parameter of the Boost converter; a control unit configured to determine a current variation parameter of the Boost converter according to the input voltage, the output voltage, and the inductance value; the control unit is further configured to obtain a reference current of the Boost converter by adopting fractional order PID control according to a given reference voltage and the output voltage; the control unit is further configured to adopt leading edge modulation prediction mean current mode control to obtain a duty ratio of a switching device in the Boost converter according to the inductive current parameter, the current change parameter and the reference current; the control unit is further configured to determine a periodic pulse signal of the switching device according to the duty ratio of the switching device, so as to control the switching device to act according to the periodic pulse signal of the switching device.
In some embodiments, the current variation parameter comprises: a current rising slope and a current falling slope; the control unit determines a current change parameter of the Boost converter according to the input voltage, the output voltage and the inductance value, and includes: determining a ratio of the input voltage to the inductance value as a current rising slope of the Boost converter; and determining the ratio of the difference value of the input voltage and the output voltage to the inductance value as the current reduction slope of the Boost converter.
In some embodiments, the obtaining, by the control unit, a reference current of the Boost converter by using fractional PID control according to a given reference voltage and the output voltage includes: determining a deviation value between the reference voltage and the output voltage according to a given reference voltage and the output voltage; and carrying out fractional order PID control on the deviation value to obtain the reference current of the Boost converter.
In some embodiments, the inductor current parameter comprises: peak value of the inductive current and mean value of the inductive current; the control unit obtains the duty ratio of a switching device in the Boost converter by adopting front edge modulation prediction mean value current mode control according to the inductive current parameter, the current change parameter and the reference current, and comprises the following steps: adjusting the average value of the inductive current of the Boost converter in the k +1 th period to the reference current; and under the condition that the current change parameters comprise a current rising slope and a current falling slope and the peak value of the inductive current of the Boost converter in the k-th period is known, determining the duty ratio of the switching device in the k + 1-th period according to the peak value of the inductive current of the k-th period, the current rising slope, the current falling slope and the duty ratio of the switching device in the k-th period.
In some embodiments, the control unit determining the periodic pulse signal of the switching device according to a duty cycle of the switching device includes: and carrying out PWM modulation on the duty ratio of the switching device to obtain a periodic pulse signal of the switching device.
In accordance with another aspect of the present invention, there is provided a power supply, including: the control device of the Boost converter described above.
In accordance with the above method, a further aspect of the present invention provides a storage medium, where the storage medium includes a stored program, and when the program runs, the storage medium is controlled to execute the above method for controlling a Boost converter.
Therefore, according to the scheme of the invention, double-loop control is adopted in the control method of the Boost converter, the outer loop is controlled by voltage and is controlled by fractional order PID, the inner loop is controlled by current and is controlled by a leading edge modulation prediction mean current mode, so that the delay of a current loop in the current mode control of the Boost converter is reduced by adopting a leading edge modulation prediction mean current mode control strategy, and the reliability of the current mode control of the Boost converter is improved.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
The technical solution of the present invention is further described in detail by the accompanying drawings and embodiments.
Drawings
Fig. 1 is a schematic flowchart of an embodiment of a control method of a Boost converter according to the present invention;
fig. 2 is a schematic flowchart of an embodiment of obtaining the reference current of the Boost converter by using fractional PID control according to a given reference voltage and the output voltage in the method of the present invention;
fig. 3 is a schematic flow chart illustrating an embodiment of obtaining a duty ratio of a switching device in the Boost converter by using leading edge modulation predictive average current mode control according to the inductor current parameter, the current variation parameter, and the reference current in the method of the present invention;
fig. 4 is a schematic structural diagram of an embodiment of a control device of the Boost converter of the present invention;
FIG. 5 is a schematic diagram of an embodiment of a Boost converter controlled based on a leading edge modulation predicted mean current mode;
FIG. 6 is a schematic diagram of an inductor current waveform controlled by a leading edge modulation prediction mean current mode of a Boost converter;
fig. 7 is a control flow diagram illustrating a control method of a Boost converter controlled based on a leading edge modulation prediction mean current mode.
The reference numbers in the embodiments of the present invention are as follows, in combination with the accompanying drawings:
102-a sampling unit; 104-control unit.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to the specific embodiments of the present invention and the accompanying drawings. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. 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.
According to an embodiment of the present invention, a method for controlling a Boost converter is provided, as shown in fig. 1, which is a schematic flow chart of an embodiment of the method of the present invention. The Boost converter adopts double-loop control consisting of an inner loop and an outer loop. The inner loop is a current loop, and the current loop is controlled by adopting a leading edge modulation prediction mean current mode. The outer ring is a voltage ring, and the voltage ring is controlled by a fractional order PID. The control method of the Boost converter comprises the following steps: step S110 to step S150.
At step S110, an input voltage, an output voltage, an inductance value, and an inductor current parameter of the Boost converter are sampled. Wherein the input voltage of the Boost converter is, for example, input voltage VinOutput voltage, e.g. output voltage VoThe inductance value is the inductance of the inductor L.
At step S120, a current variation parameter of the Boost converter is determined according to the input voltage, the output voltage and the inductance value.
In some embodiments, the current variation parameter comprises: a current rising slope and a current falling slope.
As shown in fig. 5, the Boost converter controlled based on the leading edge modulation prediction mean current mode further includes: the device comprises a PWM (pulse width modulation) module, a leading edge modulation prediction mean current mode module, a current slope module, a fractional order PID (proportion integration differentiation) module and a comparator. In the example shown in fig. 5, the input voltage of the input power source is VinThe output voltage on the load resistor R is VoThe reference voltage is VrefInductance is L, capacitance is C, and peak inductance current is ipReference current irefThe load resistance is R, the duty ratio of the switch S is d, mrAs the current rising slope, mfIs the current falling slope.
Wherein the reference voltage VrefInput to the non-inverting input terminal of the comparator to output a voltage VoThe deviation value delta V output by the output end of the comparator is output to a reference current i after passing through a fractional order PID modulerefTo the leading edge modulation predicted mean current mode module. Input voltage VinAnd an output voltage VoAfter passing through the current slope module, the output current rises by a slope mrAnd current falling slope mf. Reference current irefAnd mrAnd mfAnd after the current mode module of the leading edge modulation prediction mean value, the duty ratio d of the switching tube S is output. A PWM modulation module for outputting a periodic pulse signal P based on the duty ratio dwTo the base of the switching tube S.
In step S120, determining a current variation parameter of the Boost converter according to the input voltage, the output voltage, and the inductance value, including: determining a ratio of the input voltage to the inductance value as a current rising slope of the Boost converter; and determining the ratio of the difference value of the input voltage and the output voltage to the inductance value as the current reduction slope of the Boost converter.
Fig. 6 is a schematic diagram of an inductor current waveform controlled by a leading edge modulation prediction mean current mode of the Boost converter, and fig. 7 is a schematic diagram of a control flow of an embodiment of a control method of the Boost converter based on the leading edge modulation prediction mean current mode. As shown in fig. 7, the method for controlling a Boost converter based on leading edge modulation prediction mean current mode control includes:
In particular, with a sampled input voltage VinSampling the output voltage VoInformation on the inductance value of the inductor L, and the current rise slope mrCurrent falling gradient mf：
In step S130, a fractional PID control is used to obtain a reference current of the Boost converter according to a given reference voltage and the output voltage.
In some embodiments, with reference to an embodiment of a flowchart illustrating that the reference current of the Boost converter is obtained by using fractional order PID control according to a given reference voltage and the output voltage in the method of the present invention shown in fig. 2, a specific process of obtaining the reference current of the Boost converter by using fractional order PID control according to the given reference voltage and the output voltage in step S130 is further described, which includes: step S210 and step S220.
Step S210, determining a deviation value between the reference voltage and the output voltage according to a given reference voltage and the output voltage.
And step S220, performing fractional PID control on the deviation value to obtain the reference current of the Boost converter.
As shown in fig. 7, the method for controlling a Boost converter based on leading edge modulation prediction mean current mode control further includes: step 3, outputting by calculating a Boost circuitVoltage VoAnd a reference voltage VrefThe deviation value delta V is controlled by a fractional order PID to obtain the reference current iref。
Specifically, the output voltage V is sampled in real time by adopting a Boost circuito(k) Given a reference voltage VrefCalculating the deviation value delta V between the reference current and the reference current, and obtaining the reference current i through a fractional PID controllerref. Wherein, the transfer function of the fractional order PID control is as follows:
G＝Kp+Kis-λ+Kdsμ (2)。
in the formula, Kp、Ki、KdProportional, integral and derivative coefficients of the PID controller, respectively. The integral term order λ and differential term order μmay be in [0,1]]Any value therebetween.
The fractional order PID control (namely, the control is carried out according to the proportion P, the integral I and the differential D of the deviation in the process control) is a generalized form of PID control in a relevant scheme, the integral term order lambda and the differential term order mu can be arbitrarily valued in [0,1], and the degree of freedom of adjustable parameters is increased, so that the outer ring adopts the fractional order PID control. The fractional order PID controller enables the system to have good performance in the aspects of rapidity, stability and robustness, and the fractional order PID is more flexible than the integer order PID.
In step S140, a duty ratio of a switching device in the Boost converter is obtained by adopting leading edge modulation predictive average current mode control according to the inductor current parameter, the current variation parameter, and the reference current.
In some embodiments, the inductor current parameter comprises: peak inductor current value, and average inductor current value.
As shown in fig. 7, the method for controlling a Boost converter based on leading edge modulation prediction mean current mode control further includes: step 4, for the converter under the front edge modulation, the sampling point is set at the period starting point, and the obtained inductive current is the peak current at this time, as shown in fig. 6, wherein ipIs peak inductanceCurrent (i.e. peak inductor current), iavIs the mean value of the inductor current, ip,ssIs the steady state peak inductor current (i.e., the steady state inductor current peak).
With reference to fig. 3, an embodiment of a flow chart of obtaining a duty cycle of a switching device in the Boost converter by using leading edge modulation prediction mean current mode control according to the inductor current parameter, the current variation parameter, and the reference current in the method of the present invention further illustrates a specific process of obtaining a duty cycle of a switching device in the Boost converter by using leading edge modulation prediction mean current mode control according to the inductor current parameter, the current variation parameter, and the reference current in step S140, including: step S310 to step S320.
Step S310, adjusting the average value of the inductor current of the Boost converter in the (k +1) th cycle to the reference current.
Step S320, determining a duty ratio of the switching device in the k +1 th cycle according to the peak value of the inductor current in the k th cycle, the current rising slope, the current falling slope, and the duty ratio of the switching device in the k +1 th cycle, when the current variation parameter includes a current rising slope and a current falling slope, and the peak value of the inductor current in the k th cycle of the Boost converter is known.
As shown in fig. 7, the method for controlling a Boost converter based on leading edge modulation prediction mean current mode control further includes:
step 5, inductance current peak value i in the k periodp(k) Under known conditions, the duty ratio d (k +1) of the next period needs to be calculated in the k period, and the average value i of the inductive current of the k +1 period is calculatedav(k +1) adjusted to a reference current iref. Obtaining the average value i of the inductive current according to FIG. 6av(k +1), as shown in equation 3, T represents the period value.
Specifically, the inductor current peak i in the k-th cyclep(k) Under known conditions, the duty ratio d (k +1) of the next cycle, i.e. the (k +1) th cycle, needs to be calculated in the k-th cycle, and the average value i of the inductor current of the (k +1) th cycle is calculatedav(k +1) adjusted to a reference currentirefFrom fig. 6, we can obtain:
then, the average value i of the inductive current of the k +1 th period is assumedav(k +1) adjusted to a reference current irefAverage value i of the inductor current in the k +1 th cycleav(k +1) ═ reference current irefIn conjunction with equation 3, the duty ratio d (k +1) of the (k +1) th cycle can be obtained, as shown in equation 4.
Specifically, let the average value i of the inductor current in the (k +1) th cycleav(k +1) ═ reference current irefThen, the duty cycle of the leading edge modulation predicted mean current mode controller, i.e. the duty cycle d (k +1) of the (k +1) th cycle, is as shown in equation 4:
at step S150, a periodic pulse signal of the switching device is determined according to the duty ratio of the switching device, so as to control the switching device to act according to the periodic pulse signal of the switching device.
Considering that, in the current mode control of the Boost converter, the delay of the current sampling brings difficulty to the current mode control of the Boost converter: on the one hand, since the inductor current can only be sampled once per cycle, current control cannot be achieved by real-time comparison of the currents. On the other hand, the delay of the sampling limits the loop bandwidth. The scheme of the invention provides a leading edge modulation prediction mean value current control method of a Boost converter aiming at a continuous current mode converter, adopts a leading edge modulation prediction mean value current mode control strategy, reduces the delay of a current loop in the current mode control of the Boost converter, and has better stability and control effect. In the scheme of the invention, the control method of the Boost converter adopts double-loop control, wherein the outer loop is used for voltage control, and the inner loop is used for current control. The voltage loop is controlled by a fractional order PID. The current loop is controlled by adopting a leading edge modulation prediction mean current mode.
Fig. 5 is a schematic structural diagram of an embodiment of a Boost converter controlled based on a leading edge modulation prediction mean current mode. As shown in fig. 5, the Boost converter controlled based on the leading edge modulation prediction mean current mode includes: the circuit comprises an input power supply, an inductor L, a switching tube S, a diode Di, a capacitor C and a load resistor R. The positive pole of the input power supply is connected to the anode of the diode Di through the inductor L. And the cathode of the diode Di is connected to the cathode of the input power supply through the capacitor. The load resistor R is connected with the capacitor C in parallel. The positive electrode of the input power supply is also connected to the collector of the switching tube S after passing through the inductor L. The base electrode of the switching tube S is a control end and is used for receiving a periodic pulse signal P output by a PWM (pulse width modulation) modulation modulew. The emitter of the switching tube S is connected to the cathode of the input power supply.
When the Boost converter works in an inductive current continuous mode, the working principle is as follows: when the duty ratio d of the switching tube S is 1, the periodic pulse signal PwAt high level, the switch tube S is conducted and the diode D is connectediIs subject to reverse voltage and is turned off. When the duty ratio d of the switching tube S is equal to 0, the periodic pulse signal PwAt low level, the switch tube S is turned off and the diode D is turned oniIs conducted by bearing forward voltage.
In some embodiments, the determining the periodic pulse signal of the switching device according to the duty ratio of the switching device in step S150 includes: and carrying out PWM modulation on the duty ratio of the switching device to obtain a periodic pulse signal of the switching device.
As shown in fig. 7, the method for controlling a Boost converter based on leading edge modulation prediction mean current mode control further includes: step 6, outputting the voltage VoMeasured value and reference voltage VrefThe set values are compared, the duty ratio of the switching device (such as the switching tube S) is continuously adjusted, the control quantity of the switching device (such as the switching tube S) accurately follows the control reference in a switching period, and the output voltage is stable.
Specifically, in the scheme of the invention, in order to solve the delay problem of current sampling, a leading edge modulation prediction mean current mode control strategy is provided, and specifically, an inner ring of a Boost converter adopts leading edge modulation prediction mean current mode control. Meanwhile, the outer ring of the Boost converter is controlled by a fractional PID.
By adopting the technical scheme of the embodiment, the double-loop control is adopted in the control method of the Boost converter, the outer loop is controlled by voltage and is controlled by fractional order PID, the inner loop is controlled by current and is controlled by a leading edge modulation prediction mean current mode, so that the delay of a current loop in the current mode control of the Boost converter is reduced by adopting a leading edge modulation prediction mean current mode control strategy, and the reliability of the current mode control of the Boost converter is improved.
According to an embodiment of the present invention, there is also provided a control apparatus of a Boost converter corresponding to a control method of the Boost converter. Referring to fig. 4, a schematic diagram of an embodiment of the apparatus of the present invention is shown. The Boost converter adopts double-loop control consisting of an inner loop and an outer loop. The inner loop is a current loop, and the current loop is controlled by adopting a leading edge modulation prediction mean current mode. The outer ring is a voltage ring, and the voltage ring is controlled by a fractional order PID. A control device for a Boost converter, comprising: a sampling unit 102 and a control unit 104.
The sampling unit 102 is configured to sample an input voltage, an output voltage, an inductance value, and an inductance current parameter of the Boost converter. Wherein the input voltage of the Boost converter is, for example, input voltage VinOutput voltage, e.g. output voltage VoThe inductance value is the inductance of the inductor L. The specific function and processing of the sampling unit 102 are shown in step S110.
A control unit 104 configured to determine a current variation parameter of the Boost converter according to the input voltage, the output voltage, and the inductance value. The specific function and processing of the control unit 104 are referred to in step S120.
In some embodiments, the current variation parameter comprises: a current rising slope and a current falling slope.
As shown in FIG. 5, mean power is predicted based on leading edge modulationThe Boost converter of flow mode control still includes: the device comprises a PWM (pulse width modulation) module, a leading edge modulation prediction mean current mode module, a current slope module, a fractional order PID (proportion integration differentiation) module and a comparator. In the example shown in fig. 5, the input voltage of the input power source is VinThe output voltage on the load resistor R is VoThe reference voltage is VrefInductance is L, capacitance is C, and peak inductance current is ipReference current irefThe load resistance is R, the duty ratio of the switch S is d, mrAs the current rising slope, mfIs the current falling slope.
Wherein the reference voltage VrefInput to the non-inverting input terminal of the comparator to output a voltage VoThe deviation value delta V output by the output end of the comparator is output to a reference current i after passing through a fractional order PID modulerefTo the leading edge modulation predicted mean current mode module. Input voltage VinAnd an output voltage VoAfter passing through the current slope module, the output current rises by a slope mrAnd current falling slope mf. Reference current irefAnd mrAnd mfAnd after the current mode module of the leading edge modulation prediction mean value, the duty ratio d of the switching tube S is output. A PWM modulation module for outputting a periodic pulse signal P based on the duty ratio dwTo the base of the switching tube S.
The control unit 104 determines a current variation parameter of the Boost converter according to the input voltage, the output voltage, and the inductance value, and includes: the control unit 104 is specifically further configured to determine a ratio of the input voltage to the inductance value as a current rising slope of the Boost converter; and determining the ratio of the difference value of the input voltage and the output voltage to the inductance value as the current reduction slope of the Boost converter.
Fig. 6 is a schematic diagram of an inductor current waveform controlled by a leading edge modulation prediction mean current mode of the Boost converter, and fig. 7 is a schematic diagram of a control flow of an embodiment of a control device of the Boost converter controlled based on the leading edge modulation prediction mean current mode. As shown in fig. 7, the control device for the Boost converter controlled based on the leading edge modulation prediction mean current mode includes:
In particular, with a sampled input voltage VinSampling the output voltage VoInformation on the inductance value of the inductor L, and the current rise slope mrCurrent falling gradient mf：
The control unit 104 is further configured to obtain a reference current of the Boost converter by using fractional PID control according to a given reference voltage and the output voltage. The specific function and processing of the control unit 104 are also referred to in step S130.
In some embodiments, the obtaining, by the control unit 104, the reference current of the Boost converter by using fractional PID control according to a given reference voltage and the output voltage includes:
the control unit 104 is specifically further configured to determine an offset value between the reference voltage and the output voltage according to a given reference voltage and the output voltage. The specific functions and processes of the control unit 104 are also referred to in step S210.
The control unit 104 is specifically configured to perform fractional PID control on the deviation value to obtain a reference current of the Boost converter. The specific functions and processes of the control unit 104 are also referred to in step S220.
As shown in fig. 7, the control device for the Boost converter controlled based on the leading edge modulation prediction mean current mode further includes: step 3, calculating Boost powerOutput voltage VoAnd a reference voltage VrefThe deviation value delta V is controlled by a fractional order PID to obtain the reference current iref。
Specifically, the output voltage V is sampled in real time by adopting a Boost circuito(k) Given a reference voltage VrefCalculating the deviation value delta V between the reference current and the reference current, and obtaining the reference current i through a fractional PID controllerref. Wherein, the transfer function of the fractional order PID control is as follows:
G＝Kp+Kis-λ+Kdsμ (2)。
in the formula, Kp、Ki、KdProportional, integral and derivative coefficients of the PID controller, respectively. The integral term order λ and differential term order μmay be in [0,1]]Any value therebetween.
The fractional order PID control (namely, the control is carried out according to the proportion P, the integral I and the differential D of the deviation in the process control) is a generalized form of PID control in a relevant scheme, the integral term order lambda and the differential term order mu can be arbitrarily valued in [0,1], and the degree of freedom of adjustable parameters is increased, so that the outer ring adopts the fractional order PID control. The fractional order PID controller enables the system to have good performance in the aspects of rapidity, stability and robustness, and the fractional order PID is more flexible than the integer order PID.
The control unit 104 is further configured to obtain a duty ratio of a switching device in the Boost converter by adopting leading edge modulation prediction mean current mode control according to the inductor current parameter, the current variation parameter, and the reference current. The specific function and processing of the control unit 104 are also referred to in step S140.
In some embodiments, the inductor current parameter comprises: peak inductor current value, and average inductor current value.
As shown in fig. 7, the control device for the Boost converter controlled based on the leading edge modulation prediction mean current mode further includes: step 4, for the converter under the front edge modulation, the sampling point is set at the period starting point, and the period starting point is used for the converter under the front edge modulationThe resulting inductor current is the peak current, as shown in FIG. 6, where ipIs the peak inductor current (i.e. peak inductor current), iavIs the mean value of the inductor current, ip,ssIs the steady state peak inductor current (i.e., the steady state inductor current peak).
The control unit 104 obtains a duty ratio of a switching device in the Boost converter by adopting a leading edge modulation prediction mean current mode control according to the inductive current parameter, the current change parameter, and the reference current, and includes:
the control unit 104 is specifically further configured to adjust an average value of the inductor current of the Boost converter in the (k +1) th cycle to the reference current. The specific functions and processes of the control unit 104 are also referred to in step S310.
The control unit 104 is specifically further configured to, when the current variation parameter includes a current rising slope and a current falling slope, and an inductor current peak value of the Boost converter in a k-th period is known, determine a duty ratio of the switching device in a k + 1-th period according to the inductor current peak value of the k-th period, the current rising slope, the current falling slope, and the duty ratio of the switching device in the k-th period. The specific functions and processes of the control unit 104 are also referred to in step S320.
As shown in fig. 7, the control device for the Boost converter controlled based on the leading edge modulation prediction mean current mode further includes:
step 5, inductance current peak value i in the k periodp(k) Under known conditions, the duty ratio d (k +1) of the next period needs to be calculated in the k period, and the average value i of the inductive current of the k +1 period is calculatedav(k +1) adjusted to a reference current iref. Obtaining the average value i of the inductive current according to FIG. 6av(k +1), as shown in equation 3, T represents the period value.
Specifically, the inductor current peak i in the k-th cyclep(k) Under known conditions, the duty ratio d (k +1) of the next cycle, i.e. the (k +1) th cycle, needs to be calculated in the k-th cycle, and the average value i of the inductor current of the (k +1) th cycle is calculatedav(k +1) adjusted to a reference current irefAccording to the figure6, obtaining:
then, the average value i of the inductive current of the k +1 th period is assumedav(k +1) adjusted to a reference current irefAverage value i of the inductor current in the k +1 th cycleav(k +1) ═ reference current irefIn conjunction with equation 3, the duty ratio d (k +1) of the (k +1) th cycle can be obtained, as shown in equation 4.
Specifically, let the average value i of the inductor current in the (k +1) th cycleav(k +1) ═ reference current irefThen, the duty cycle of the leading edge modulation predicted mean current mode controller, i.e. the duty cycle d (k +1) of the (k +1) th cycle, is as shown in equation 4:
the control unit 104 is further configured to determine a periodic pulse signal of the switching device according to the duty cycle of the switching device, so as to control the switching device to act according to the periodic pulse signal of the switching device. The specific function and processing of the control unit 104 are also referred to in step S150.
Considering that, in the current mode control of the Boost converter, the delay of the current sampling brings difficulty to the current mode control of the Boost converter: on the one hand, since the inductor current can only be sampled once per cycle, current control cannot be achieved by real-time comparison of the currents. On the other hand, the delay of the sampling limits the loop bandwidth. The scheme of the invention provides a leading edge modulation prediction mean value current control device of a Boost converter aiming at a continuous current mode converter, adopts a leading edge modulation prediction mean value current mode control strategy, reduces the delay of a current loop in the current mode control of the Boost converter, and has better stability and control effect. In the scheme of the invention, a control device of the Boost converter adopts double-loop control, wherein the outer loop is used for voltage control, and the inner loop is used for current control. The voltage loop is controlled by a fractional order PID. The current loop is controlled by adopting a leading edge modulation prediction mean current mode.
Fig. 5 is a schematic structural diagram of an embodiment of a Boost converter controlled based on a leading edge modulation prediction mean current mode. As shown in fig. 5, the Boost converter controlled based on the leading edge modulation prediction mean current mode includes: the circuit comprises an input power supply, an inductor L, a switching tube S, a diode Di, a capacitor C and a load resistor R. The positive pole of the input power supply is connected to the anode of the diode Di through the inductor L. And the cathode of the diode Di is connected to the cathode of the input power supply through the capacitor. The load resistor R is connected with the capacitor C in parallel. The positive electrode of the input power supply is also connected to the collector of the switching tube S after passing through the inductor L. The base electrode of the switching tube S is a control end and is used for receiving a periodic pulse signal P output by a PWM (pulse width modulation) modulation modulew. The emitter of the switching tube S is connected to the cathode of the input power supply.
When the Boost converter works in an inductive current continuous mode, the working principle is as follows: when the duty ratio d of the switching tube S is 1, the periodic pulse signal PwAt high level, the switch tube S is conducted and the diode D is connectediIs subject to reverse voltage and is turned off. When the duty ratio d of the switching tube S is equal to 0, the periodic pulse signal PwAt low level, the switch tube S is turned off and the diode D is turned oniIs conducted by bearing forward voltage.
In some embodiments, the determining, by the control unit 104, the periodic pulse signal of the switching device according to the duty cycle of the switching device includes: the control unit 104 is specifically further configured to perform PWM modulation on the duty ratio of the switching device, so as to obtain a periodic pulse signal of the switching device.
As shown in fig. 7, the control device for the Boost converter controlled based on the leading edge modulation prediction mean current mode further includes: step 6, outputting the voltage VoMeasured value and reference voltage VrefThe set values are compared, the duty ratio of the switching device (such as the switching tube S) is continuously adjusted, the control quantity of the switching device (such as the switching tube S) accurately follows the control reference in a switching period, and the output voltage is stable.
Specifically, in the scheme of the invention, in order to solve the delay problem of current sampling, a leading edge modulation prediction mean current mode control strategy is provided, and specifically, an inner ring of a Boost converter adopts leading edge modulation prediction mean current mode control. Meanwhile, the outer ring of the Boost converter is controlled by a fractional PID.
Since the processes and functions implemented by the apparatus of this embodiment substantially correspond to the embodiments, principles and examples of the method, reference may be made to the related descriptions in the embodiments without being detailed in the description of this embodiment, which is not described herein again.
By adopting the technical scheme of the invention, through double-loop control adopted in the control method of the Boost converter, the outer loop is controlled by voltage and controlled by adopting a fractional order PID (proportion integration differentiation), the inner loop is controlled by current and controlled by adopting a leading edge modulation prediction mean current mode, and the fractional order PID is more flexible than an integer order PID.
According to an embodiment of the invention, there is also provided a power supply corresponding to a control device of a Boost converter. The power supply may include: the control device of the Boost converter described above.
Since the processes and functions implemented by the power supply of this embodiment substantially correspond to the embodiments, principles and examples of the apparatus, reference may be made to the related descriptions in the foregoing embodiments without being detailed in the description of this embodiment.
By adopting the technical scheme of the invention, through double-loop control adopted in the control method of the Boost converter, the outer loop is voltage controlled and adopts fractional order PID control, the inner loop is current controlled and adopts leading edge modulation prediction mean current mode control, the delay of a current loop in the current mode control of the Boost converter is reduced, and the control method has better stability and control effect.
According to an embodiment of the present invention, there is also provided a storage medium corresponding to a control method of a Boost converter, where the storage medium includes a stored program, and when the program runs, a device in which the storage medium is located is controlled to execute the control method of the Boost converter.
Since the processing and functions implemented by the storage medium of this embodiment substantially correspond to the embodiments, principles, and examples of the foregoing method, reference may be made to the related descriptions in the foregoing embodiments without being detailed in the description of this embodiment.
By adopting the technical scheme of the invention, the double-loop control is adopted in the control method of the Boost converter, the outer loop is controlled by voltage and is controlled by fractional PID (proportion integration differentiation), the inner loop is controlled by current and is controlled by a leading edge modulation prediction mean current mode, so that the system has good performances in the aspects of rapidity, stability and robustness.
In summary, it is readily understood by those skilled in the art that the advantageous modes described above can be freely combined and superimposed without conflict.
The above description is only an example of the present invention, and is not intended to limit the present invention, and it is obvious to those skilled in the art that various modifications and variations can be made in the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the claims of the present invention.
Claims (12)
1. The control method of the Boost converter is characterized in that the Boost converter adopts double-loop control consisting of an inner loop and an outer loop; the inner ring is a current ring, and the current ring is controlled by adopting a leading edge modulation prediction mean current mode; the outer ring is a voltage ring, and the voltage ring is controlled by fractional order PID; the control method of the Boost converter comprises the following steps:
sampling input voltage, output voltage, an inductance value and an inductance current parameter of the Boost converter;
determining a current change parameter of the Boost converter according to the input voltage, the output voltage and the inductance value;
obtaining the reference current of the Boost converter by adopting fractional order PID control according to a given reference voltage and the output voltage;
according to the inductance current parameter, the current change parameter and the reference current, adopting a leading edge modulation prediction mean value current mode to control to obtain the duty ratio of a switching device in the Boost converter;
and determining a periodic pulse signal of the switching device according to the duty ratio of the switching device, so as to control the switching device to act according to the periodic pulse signal of the switching device.
2. The method of controlling the Boost converter according to claim 1, wherein the current variation parameter comprises: a current rising slope and a current falling slope;
determining a current variation parameter of the Boost converter according to the input voltage, the output voltage and the inductance value, including:
determining a ratio of the input voltage to the inductance value as a current rising slope of the Boost converter; and determining the ratio of the difference value of the input voltage and the output voltage to the inductance value as the current reduction slope of the Boost converter.
3. The method for controlling the Boost converter according to claim 1, wherein the obtaining of the reference current of the Boost converter by using fractional order PID control according to a given reference voltage and the output voltage comprises:
determining a deviation value between the reference voltage and the output voltage according to a given reference voltage and the output voltage;
and carrying out fractional order PID control on the deviation value to obtain the reference current of the Boost converter.
4. The method of controlling the Boost converter according to claim 1, wherein the inductor current parameter comprises: peak value of the inductive current and mean value of the inductive current;
according to the inductance current parameter, the current change parameter and the reference current, adopting a leading edge modulation prediction mean value current mode control to obtain the duty ratio of a switching device in the Boost converter, and comprising the following steps:
adjusting the average value of the inductive current of the Boost converter in the k +1 th period to the reference current;
and under the condition that the current change parameters comprise a current rising slope and a current falling slope and the peak value of the inductive current of the Boost converter in the k-th period is known, determining the duty ratio of the switching device in the k + 1-th period according to the peak value of the inductive current of the k-th period, the current rising slope, the current falling slope and the duty ratio of the switching device in the k-th period.
5. The control method of the Boost converter according to any one of claims 1 to 4, wherein determining the periodic pulse signal of the switching device according to the duty ratio of the switching device includes:
and carrying out PWM modulation on the duty ratio of the switching device to obtain a periodic pulse signal of the switching device.
6. A control device of a Boost converter is characterized in that the Boost converter adopts double-loop control consisting of an inner loop and an outer loop; the inner ring is a current ring, and the current ring is controlled by adopting a leading edge modulation prediction mean current mode; the outer ring is a voltage ring, and the voltage ring is controlled by fractional order PID; a control device for a Boost converter, comprising:
a sampling unit configured to sample an input voltage, an output voltage, an inductance value, and an inductance current parameter of the Boost converter;
a control unit configured to determine a current variation parameter of the Boost converter according to the input voltage, the output voltage, and the inductance value;
the control unit is further configured to obtain a reference current of the Boost converter by adopting fractional order PID control according to a given reference voltage and the output voltage;
the control unit is further configured to adopt leading edge modulation prediction mean current mode control to obtain a duty ratio of a switching device in the Boost converter according to the inductive current parameter, the current change parameter and the reference current;
the control unit is further configured to determine a periodic pulse signal of the switching device according to the duty ratio of the switching device, so as to control the switching device to act according to the periodic pulse signal of the switching device.
7. The control device of the Boost converter according to claim 6, wherein the current variation parameter comprises: a current rising slope and a current falling slope;
the control unit determines a current change parameter of the Boost converter according to the input voltage, the output voltage and the inductance value, and includes:
determining a ratio of the input voltage to the inductance value as a current rising slope of the Boost converter; and determining the ratio of the difference value of the input voltage and the output voltage to the inductance value as the current reduction slope of the Boost converter.
8. The control device of the Boost converter according to claim 6, wherein the control unit obtains the reference current of the Boost converter by using fractional order PID control according to a given reference voltage and the output voltage, and comprises:
determining a deviation value between the reference voltage and the output voltage according to a given reference voltage and the output voltage;
and carrying out fractional order PID control on the deviation value to obtain the reference current of the Boost converter.
9. The control device of the Boost converter according to claim 6, wherein the inductor current parameter comprises: peak value of the inductive current and mean value of the inductive current;
the control unit obtains the duty ratio of a switching device in the Boost converter by adopting front edge modulation prediction mean value current mode control according to the inductive current parameter, the current change parameter and the reference current, and comprises the following steps:
adjusting the average value of the inductive current of the Boost converter in the k +1 th period to the reference current;
and under the condition that the current change parameters comprise a current rising slope and a current falling slope and the peak value of the inductive current of the Boost converter in the k-th period is known, determining the duty ratio of the switching device in the k + 1-th period according to the peak value of the inductive current of the k-th period, the current rising slope, the current falling slope and the duty ratio of the switching device in the k-th period.
10. The control device of the Boost converter according to any one of claims 6 to 9, wherein the control unit determines the periodic pulse signal of the switching device according to the duty ratio of the switching device, and comprises:
and carrying out PWM modulation on the duty ratio of the switching device to obtain a periodic pulse signal of the switching device.
11. A power supply, comprising: a control apparatus of a Boost converter according to any of claims 6 to 10.
12. A storage medium, characterized in that the storage medium comprises a stored program, wherein when the program runs, a device in which the storage medium is located is controlled to execute the control method of the Boost converter according to any one of claims 1 to 5.
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| CN115514194A (en) * | 2022-11-24 | 2022-12-23 | 成都市易冲半导体有限公司 | Load resistance value determining method and device, electronic equipment and storage medium |
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| CN115514194A (en) * | 2022-11-24 | 2022-12-23 | 成都市易冲半导体有限公司 | Load resistance value determining method and device, electronic equipment and storage medium |
| CN115514194B (en) * | 2022-11-24 | 2023-02-28 | 成都市易冲半导体有限公司 | Load resistance value determining method and device, electronic equipment and storage medium |
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