CN116846196B - Control circuit applied to high-gain converter - Google Patents
Control circuit applied to high-gain converter Download PDFInfo
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- CN116846196B CN116846196B CN202310655229.8A CN202310655229A CN116846196B CN 116846196 B CN116846196 B CN 116846196B CN 202310655229 A CN202310655229 A CN 202310655229A CN 116846196 B CN116846196 B CN 116846196B
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- 238000005259 measurement Methods 0.000 abstract 1
- 230000003068 static effect Effects 0.000 abstract 1
- 238000010248 power generation Methods 0.000 description 8
- 230000001276 controlling effect Effects 0.000 description 7
- 238000010586 diagram Methods 0.000 description 6
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Classifications
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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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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/381—Dispersed generators
-
- 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
- H02M1/0003—Details of control, feedback or regulation circuits
- H02M1/0009—Devices or circuits for detecting current in a converter
-
- 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
- H02M1/0003—Details of control, feedback or regulation circuits
- H02M1/0025—Arrangements for modifying reference values, feedback values or error values in the control loop of a converter
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
- H02J2300/20—The dispersed energy generation being of renewable origin
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
Abstract
The invention discloses a self-adaptive current type single-period control circuit applied to a high-gain converter, which can perform single-period control on the converter according to an acquired switching tube current signal, weaken hysteresis of input voltage disturbance when the input voltage disturbance passes through a circuit device, and solve the problem of inaccurate reference inductance current in traditional current mode control caused by input voltage change or difficulty in measurement in actual engineering; meanwhile, when the load of the converter cannot be directly obtained or is changed drastically, so that the static working point of the system is greatly deviated to cause control instability, the control reference value controlled in a single period is adaptively matched by introducing an output voltage acquisition signal so as to adapt to the change of the working environment, and the stable operation of the converter is ensured. Compared with the control circuit of the existing high-gain converter, the control circuit of the high-gain converter can accurately and rapidly cope with input disturbance and load disturbance in the working process of the converter by using fewer signal acquisition devices, so that the robustness of the system is improved.
Description
Technical Field
The invention relates to the technical field of power electronic converters, in particular to a control circuit applied to a high-gain converter.
Background
With the growing global energy demand, fossil fuels are increasingly dependent as the primary source of energy, however, there is a series of environmental problems that severely affect global climate change. In order to cope with the crisis of fossil fuels, a new energy distributed power generation system which is more environment-friendly and sustainable must be popularized, so that the use of fossil fuels can be reduced, energy can be generated in a scattered manner according to requirements by utilizing natural resources, and more efficient power supply can be realized by matching with a large power grid.
The new energy distributed power generation system faces the main problem of power generation side volatility, and is characterized in that the transient power change is overlarge, so that the power generation system frequently has the overload or underload condition, and the stable power supply of the system is not facilitated; in addition, due to the complexity and variability of the load, it is difficult to introduce the load value as a closed-loop control parameter into the control strategy of the power generation system, which results in difficulty in timely adjusting the system to adapt to different load conditions, and affects the reliability of the whole power supply network.
Therefore, how to provide a solution to the above technical problem is a problem that a person skilled in the art needs to solve at present.
Disclosure of Invention
The invention aims to provide a control circuit for a high-gain converter, which changes a reference value of a single-period control circuit in real time through a self-adaptive parameter matching circuit when an input voltage or a load is disturbed, stably controls the output voltage of the high-gain converter, eliminates the influence of the input disturbance or the load disturbance on the stable operation of the high-gain converter, and enhances the robustness and the reliability of the control circuit of the high-gain converter.
In order to solve the above technical problems, the present invention provides a control circuit applied to a high-gain converter, where the high-gain converter outputs a higher dc voltage for a load, and adaptive parameters can be quickly matched when a disturbance occurs to make the output voltage follow a given reference value, so as to meet requirements of the high-gain converter for resisting input disturbance and load disturbance, and the control circuit includes:
module 1 current acquisition circuit with input end connected with switching tube S in series in high gain converter and used for acquiring actual current value i of switching tube sw ；
Module 2 voltage acquisition circuit with input ends connected with load in parallel and used for acquiring actual voltage values U at two ends of load O ；
The module 3 self-adaptive parameter matching control circuit with the input end connected with the output end of the voltage acquisition circuit is used for predicting the average current value of the inductor L of the high-gain converter on line, namely, the average current predicted value of the inductor L, and outputting the result to the control circuit to be used as an integral reference value of the current of the switching tube S after operation;
and the module 4 single-period control circuit with the input end connected with the output end of the current acquisition circuit and the output end of the adaptive parameter matching control circuit is used for adaptively controlling the switching tube S according to the current of the switching tube S and the average current predicted value of the inductor L, so that the output voltage of the high-gain converter can be equal to the required voltage reference value when the load or the input voltage changes.
Preferably, the current acquisition circuit acquires the switching tube current i sw The sensor used is a hall current sensor.
Preferably, the voltage acquisition circuit acquires the output voltage U O The sensor used is a hall voltage sensor.
Preferably, the adaptive parameter matching circuit includes a reference voltage module, a first differential amplifier, a power operator, a first proportional amplifier, a constant module, a first adder, a first logarithmic operator, a second logarithmic operator, a first subtractor, a first exponent operator, and a first integrator, wherein:
the non-inverting input end of the first differential amplifier is connected with the output end of the voltage acquisition circuit;
the inverting input end of the first differential amplifier is connected with the output end of the reference voltage module;
the output end of the first differential amplifier is connected with the input end of the squarer and the non-inverting input end of the first proportional amplifier;
the output end of the first proportional amplifier is connected with the inverting input end of the first logarithmic operator;
the positive phase input end of the first adder is connected with the output end of the square operator and the output end of the constant module;
the output end of the first adder is connected with the reverse input end of the second logarithmic operator;
the positive input end of the first logarithmic operator is connected with a reference zero potential;
the output end of the first logarithmic operator is connected with the inverting input end of the first subtracter;
the positive input end of the first logarithmic operator is connected with a reference zero potential;
the output end of the second logarithmic operator is connected with the non-inverting input end of the first subtracter;
the output end of the first subtracter is connected with the inverting input end of the first exponent operator;
the non-inverting input end of the first exponential operator is connected with a reference zero potential;
the output end of the first exponent operator is connected with the inverting input end of the first integrator;
the non-inverting input end of the first integrator is connected with a reference zero potential.
Preferably, the process of the adaptive parameter matching circuit specifically includes:
the first differential amplifier is used for obtaining the output voltage U O A voltage error value with the voltage reference value to obtain a control voltage according to the voltage error value;
the power arithmetic unit, the first proportional amplifier, the constant module, the first adder, the first logarithmic arithmetic unit, the second logarithmic arithmetic unit, the first subtracter, the first exponential arithmetic unit and the first integrator form an adaptive parameter matching module, which is used for performing mathematical operation according to the voltage error value to estimate the average current value of the inductance L of the high gain converter and serve as an integral reference value of the current of the switching tube S;
preferably, the single-period control circuit comprises a second integrator, a second proportional amplifier, an SR flip-flop, a clock circuit module, and a driver, wherein:
the inverting input end of the second integrator is connected with the output end of the current acquisition circuit;
the non-inverting input end of the second integrator is connected with a reference zero potential;
the output end of the second integrator is connected with the inverting input end of the first comparator;
the non-inverting input end of the second proportional amplifier is connected with the output end of the first integrator in claim 2;
the output end of the second proportional amplifier is connected with the non-inverting input end of the first comparator;
the output end of the first comparator is connected with the reset end of the SR trigger;
the setting end of the SR trigger is connected with the clock circuit module;
the first output end of the SR trigger is connected with the driver and the reset circuit of the second integrator;
the output end of the driver is connected with the high-gain converter switching tube S.
Preferably, the process of the single-period control circuit specifically comprises the following steps:
the second integrator is used for carrying out integral operation on the switching tube current of the high-gain converter;
the second proportional amplifier is used for amplifying the integral reference value of the current of the switching tube S in proportion according to the claim 4, and the amplification coefficient is K a ；
The first comparator is used for comparing the integral value of the switching tube S current with an integral reference value to generate a high level signal or a low level signal to control the SR trigger;
the SR trigger is used for controlling the on-off of the switching tube S and the working state of the second integrator when the high-level signal and the low-level signal are received.
Preferably, the single-period control circuit of the high-gain converter with the integrated reference value of the current of the adaptive regulating switch tube S is characterized in that: the control circuit can enable the high-gain converter to quickly adapt to the conversion of the working environment when the input disturbance or the load disturbance occurs, and keep stable output voltage, and the control circuit comprises the following specific contents:
output voltage value U acquired by the voltage acquisition circuit O Obtaining an average current predicted value of the high-gain converter inductance L through normalization self-adaptive parameter matching and integral operation with the error value of the reference voltage;
passing the average current predicted value of the inductor L through a proportional amplifier to be used as a reference value of the current integrated value of the switching tube;
comparing the current integral value of the switching tube S with a reference value of the current integral value of the switching tube S, controlling the on-off of the switching tube through an SR trigger to enable the current integral value of the switching tube S to follow the reference value of the current integral value of the switching tube S, and simultaneously enabling the output voltage U to be O Is equal to the reference voltage.
The embodiment of the invention has the following beneficial effects:
compared with the existing current type control technology, the circuit of the invention has the following components: the anti-input disturbance characteristic of the single-period control method and the anti-load disturbance characteristic of the self-adaptive control method are combined well, the disturbance occurring in the working process of the high-gain converter can be accurately and rapidly handled by a smaller number of signal acquisition devices, and the problem of cost increase caused by the increase of the acquisition devices in the existing method is solved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required in the prior art and the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a control circuit for a high gain converter according to the present invention;
FIG. 2 is a schematic diagram showing a control circuit according to the present invention;
FIG. 3 is a process flow diagram of a high gain converter control circuit according to the present invention;
fig. 4 is a waveform of an output model of a control circuit of a high gain converter according to the present invention.
Detailed Description
The core of the invention is to provide a control circuit of a high-gain converter, when input disturbance or load disturbance occurs, the reference value of a single-period control circuit is changed in real time through a self-adaptive parameter matching circuit, the influence of disturbance on the high-gain converter is eliminated in time, the output voltage of the high-gain converter is stably controlled, and the robustness and the reliability of the high-gain converter are enhanced.
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Referring to fig. 1, fig. 1 is a schematic structural diagram of a control circuit of a high-gain converter according to the present invention, wherein the high-gain converter outputs a higher dc voltage for a load, and adaptive parameters can be quickly matched when a disturbance occurs to enable the output voltage to follow a given reference value, so as to meet requirements of the high-gain converter for resisting input disturbance and load disturbance, and the control circuit comprises:
module 1 current acquisition circuit with input end connected with switching tube S in series in high gain converter and used for acquiring actual current value i of switching tube sw ；
Module 2 voltage acquisition circuit with input ends connected with load in parallel and used for acquiring actual voltage values U at two ends of load O ；
The module 3 self-adaptive parameter matching control circuit with the input end connected with the output end of the voltage acquisition circuit is used for predicting the average current value of the inductor L of the high-gain converter on line, namely, the average current predicted value of the inductor L, and outputting the result to the control circuit to be used as an integral reference value of the current of the switching tube S after operation;
and the module 4 single-period control circuit with the input end connected with the output end of the current acquisition circuit and the output end of the adaptive parameter matching control circuit is used for adaptively controlling the switching tube S according to the current of the switching tube S and the average current predicted value of the inductor L, so that the output voltage of the high-gain converter can be equal to the required voltage reference value when the load or the input voltage changes.
Referring to fig. 2, fig. 2 is a schematic diagram of a specific structure of a control circuit of a high gain converter according to the present invention, which is based on the above embodiments:
as a preferred embodiment, the current acquisition circuit includes:
for collecting the switching tube current i flowing through said high gain converter sw The sensor of (2) is a hall current sensor.
As a preferred embodiment, the voltage acquisition circuit includes:
for collecting the output voltage U of the high gain converter O The sensor of (2) is a Hall voltage sensor.
As a preferred embodiment, the adaptive parameter matching circuit includes a reference voltage module, a first differential amplifier, a power operator, a first proportional amplifier, a constant module, a first adder, a first logarithmic operator, a second logarithmic operator, a first subtractor, a first exponent operator, and a first integrator, wherein:
the non-inverting input end of the first differential amplifier is connected with the output end of the voltage acquisition circuit;
the inverting input end of the first differential amplifier is connected with the output end of the reference voltage module;
the output end of the first differential amplifier is connected with the input end of the squarer and the non-inverting input end of the first proportional amplifier;
the output end of the first proportional amplifier is connected with the inverting input end of the first logarithmic operator;
the positive phase input end of the first adder is connected with the output end of the square operator and the output end of the constant module;
the output end of the first adder is connected with the reverse input end of the second logarithmic operator;
the positive input end of the first logarithmic operator is connected with a reference zero potential;
the output end of the first logarithmic operator is connected with the inverting input end of the first subtracter;
the positive input end of the first logarithmic operator is connected with a reference zero potential;
the output end of the second logarithmic operator is connected with the non-inverting input end of the first subtracter;
the output end of the first subtracter is connected with the inverting input end of the first exponent operator;
the non-inverting input end of the first exponential operator is connected with a reference zero potential;
the output end of the first exponent operator is connected with the inverting input end of the first integrator;
the non-inverting input end of the first integrator is connected with a reference zero potential.
Specifically, the process of the adaptive parameter matching circuit specifically includes:
the first differential amplifier is used for obtaining the output voltage U O A voltage error value with the voltage reference value to obtain a control voltage according to the voltage error value;
the power arithmetic unit, the first proportional amplifier, the constant module, the first adder, the first logarithmic arithmetic unit, the second logarithmic arithmetic unit, the first subtracter, the first exponential arithmetic unit and the first integrator form an adaptive parameter matching module, which is used for performing mathematical operation according to the voltage error value to estimate the average current value of the inductance L of the high gain converter and serve as an integral reference value of the current of the switching tube S;
preferably, the single-period control circuit comprises a second integrator, a second proportional amplifier, an SR flip-flop, a clock circuit module, and a driver, wherein:
the inverting input end of the second integrator is connected with the output end of the current acquisition circuit;
the non-inverting input end of the second integrator is connected with a reference zero potential;
the output end of the second integrator is connected with the inverting input end of the first comparator;
the non-inverting input end of the second proportional amplifier is connected with the output end of the first integrator in claim 2;
the output end of the second proportional amplifier is connected with the non-inverting input end of the first comparator;
the output end of the first comparator is connected with the reset end of the SR trigger;
the setting end of the SR trigger is connected with the clock circuit module;
the first output end of the SR trigger is connected with the driver and the reset circuit of the second integrator;
the output end of the driver is connected with the high-gain converter switching tube S.
As a preferred embodiment, the single period control circuit comprises a second integrator, a second proportional amplifier, an SR flip-flop, a driver, wherein:
the inverting input end of the second integrator is connected with the output end of the current acquisition circuit;
the non-inverting input end of the second integrator is connected with a reference zero potential;
the output end of the second integrator is connected with the inverting input end of the first comparator;
the non-inverting input end of the second proportional amplifier is connected with the output end of the first integrator in claim 2;
the output end of the second proportional amplifier is connected with the non-inverting input end of the first comparator;
the output end of the first comparator is connected with the reset end of the SR trigger;
the set end of the SR trigger is connected with the clock circuit;
the first output end of the SR trigger is connected with the driver and the reset circuit of the second integrator;
the output end of the driver is connected with the high-gain converter switching tube S.
Specifically, the process of the single-period control circuit specifically includes:
the second integrator is used for carrying out integral operation on the switching tube current of the high-gain converter;
the second proportional amplifier is used for amplifying the integral reference value of the current of the switching tube S in proportion according to the claim 4, and the amplification coefficient is K a ；
The first comparator is used for comparing the integral value of the switching tube S current with an integral reference value to generate a high level signal or a low level signal to control the SR trigger;
the SR trigger is used for controlling the on-off of the switching tube S and the working state of the second integrator when the high-level signal and the low-level signal are received.
As a preferred embodiment, the single-period control circuit of the high-gain converter with an integrated reference value for adaptively adjusting the current of the switching tube S is characterized by comprising:
output voltage value U acquired by the voltage acquisition circuit O Obtaining an average current predicted value of the high-gain converter inductance L through normalization self-adaptive parameter matching and integral operation with the error value of the reference voltage;
passing the average current predicted value of the inductor L through a proportional amplifier to be used as a reference value of the current integrated value of the switching tube;
comparing the current integral value of the switching tube S with a reference value of the current integral value of the switching tube S, controlling the on-off of the switching tube through an SR trigger to enable the current integral value of the switching tube S to follow the reference value of the current integral value of the switching tube S, and simultaneously enabling the output voltage U to be O Is equal to the reference voltage.
Specifically, the control circuit provided by the application is suitable for a high-gain converter in which the average value of all components in the high-gain converter in one switching period of a controllable switch is in linear relation with the average value of input voltage and output voltage, i.e. the high-gain converter can establish a state space average model. In the invention, the N-channel field effect transistor is taken as an example of the controllable switch, and in practical application, a user can select a corresponding controllable switch according to practical needs, and the application is not particularly limited herein.
Taking the high gain converter shown in fig. 1 as an example, a generalized state space average model is adopted, and the state equation is as follows:
wherein n is the number of gain modules, L is the inductance value in each gain module (the circuit parameters of each gain module are equal), C is the output capacitance of the output end of the high-gain converter, and R is the output load of the output end of the high-gain converter.
In the control circuit adopted by the invention, the current signal of the switching tube S is collected to perform single-period control. Because the current flowing through the switching tube is the sum of n inductance currents when the high-gain converter is in the working mode that the switching tube S is conducted, and the change of the input voltage directly influences the change of the inductance current when the switching tube S is conducted, the change of the inductance current does not need to be collected by the input end of the controller after the hysteresis of the circuit device, and the characteristic that the single-period control strategy weakens the input disturbance is ensured.
During a period of time, the switch tube S is driven to be conducted because the clock circuit generates a high level pulse to make the SR trigger emit a high level. At the same time, the second integrator is set to zero by the clock signal, and the first comparator gives a low level signal to keep the positive output terminal of the SR flip-flop high. And after that, the second integrator starts integration, when the integral value of the second integrator reaches an integration reference value, the first comparator generates a high level, the reset end of the SR trigger receives the signal of the first comparator and generates a low level, so that the switching tube S is turned off, the switching tube S is always kept open, the flowing current is zero, and the integral value of the second integrator is kept unchanged at the integration reference value. Until the high level pulse generated by the next clock signal enables the SR trigger to set and output high level, starting the next period, and simultaneously resetting the second integrator.
In the high gain converter, when the system is in steady state operation, the DC steady state value can be regarded as no longer changing each state variable, namelySubstituting the state equation to obtain the steady state value expression x= -A of each state variable -1 Bu, reference voltage U ref Substituting the output variable into the output equation to obtain U ref =cx, simultaneous equation to obtain the high gain converter at reference voltage U ref The following rated duty cycle:
expression of inductance current average value:
then for the average value of the output voltage of the high boost converter to be U O ＝U ref The average value of the switching tube current in one period is:
i.e. when the reference value of the integrator is met,when the SR trigger is reset due to receiving the high level output by the first comparator, the switching tube is driven to be turned off.
In order to solve the influence of input voltage disturbance and load disturbance on the current average value of an actual switching tube of the high-gain converter, in the self-adaptive parameter matching circuit of the high-gain converter, an inductance current I is obtained L As an adaptive parameter to be estimated, letThe average value of the current in one period of the high gain converter is equal to the product of the sum of the average currents of n inductance currents and the duty ratio, and the control mode of the integrator can be obtained as follows:
the reference value of the second integrator can be expressed as:
in the control method adopted by the invention, the parameter value is self-adaptiveFrom a normalized adaptive control rateGiven by e=u for the output voltage and the reference voltage O -U ref The adaptive parameter matching circuit can inversely boost the influence of the working environment of the gain converter on the control parameter in the single-period control circuit through the error, so that the parameter is adjusted to enable the whole converter and the controller system to adapt to the change of the current working environment.
In summary, the control circuit introduces the switching tube current and the output voltage of the high-gain converter when controlling the switching tube S in the high-gain converter, wherein the self-adaptive parameter matching circuit enables the control reference value of single-period control to carry out self-adaptive matching when disturbance occurs, so that the output voltage of the high-gain converter is equal to the output voltage reference value, thereby eliminating the influence of load disturbance and input disturbance on the output voltage, and improving the robustness and stability of the control of the high-gain converter.
The control circuit of the high-gain converter can be used in a new energy distributed power generation system, the power generation side of the new energy distributed power generation system has the characteristics of discontinuity and fluctuation, the input disturbance occurs more times, the load disturbance caused by switching of load side loads and different electricity consumption peak periods is also larger, and the control circuit is adopted to control the high-gain converter, so that the performance of the high-gain converter for resisting input disturbance and load disturbance can be effectively improved.
For easy understanding, the present invention summarizes the process of the high-gain converter control circuit, and provides a specific process flow chart, please refer to fig. 3, and fig. 3 is a process flow chart of the high-gain converter control circuit provided by the present invention.
Referring to fig. 4, fig. 4 is an output waveform diagram of a high gain converter control circuit according to the present invention. When input disturbance or load disturbance occurs, the adaptive parameters of the current predicted value of the inductor L can match the working environment along with the occurrence of the disturbance, so that the switching tube S is controlled to enable the output voltage to be equal to the reference voltage.
In the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the elements or modules referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as implying or indicating relative importance.
The term "coupled" is to be interpreted broadly, and may be used, for example, as a fixed connection, as a removable connection, or as an integral connection, unless clearly indicated and limited otherwise; can be mechanically or electrically connected; either directly or via an intermediate profile link, or by communication between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
The above embodiments are merely for illustrating the technical solution of the present application, and are not limited thereto; the previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention, and is provided to enable any person skilled in the art to make or use the present invention and to enable any person skilled in the art to make or use the present invention; such substitutions and modifications do not depart from the spirit and scope of the technical solutions of the embodiments of the present application.
Claims (4)
1. The method comprises the following steps ofWhen the load or input voltage of the high-gain converter is disturbed, the control circuit is used for carrying out current type single-period control by collecting the current signal of the switching tube S and introducing the output voltage U O The method is characterized by comprising the following steps of adaptively matching control reference values of current type single-period control to realize stable control of a high-gain converter, and the method comprises the following steps:
module 1 current acquisition circuit with input end connected with switching tube S in series in high gain converter and used for acquiring actual current value i of switching tube S sw ；
Module 2 voltage acquisition circuit with input ends connected with load in parallel and used for acquiring output voltage U at two ends of load O ；
The module 3 self-adaptive parameter matching control circuit with the input end connected with the output end of the voltage acquisition circuit is used for predicting the average current value of the inductor L of the high-gain converter on line, namely, the average current predicted value of the inductor L, and outputting the result to the control circuit to be used as an integral reference value of the current of the switching tube S after operation;
the module 4 single-period control circuit with the input end connected with the output end of the current acquisition circuit and the output end of the adaptive parameter matching control circuit is used for adaptively controlling the switching tube S according to the current of the switching tube S and the average current predicted value of the inductor L, so that the output voltage of the high-gain converter can be equal to the required voltage reference value when the load or the input voltage changes;
the module 3 self-adaptive parameter matching circuit comprises a reference voltage module, a first differential amplifier, a power arithmetic unit, a first proportional amplifier, a constant module, a first adder, a first logarithmic arithmetic unit, a second logarithmic arithmetic unit, a first subtracter, a first exponential arithmetic unit and a first integrator, wherein:
the non-inverting input end of the first differential amplifier is connected with the output end of the voltage acquisition circuit;
the inverting input end of the first differential amplifier is connected with the output end of the reference voltage module;
the output end of the first differential amplifier is connected with the input end of the square arithmetic unit and the non-inverting input end of the first proportional amplifier;
the output end of the first proportional amplifier is connected with the inverting input end of the first logarithmic operator;
the positive phase input end of the first adder is connected with the output end of the square operator and the output end of the constant module;
the output end of the first adder is connected with the reverse input end of the second logarithmic operator;
the positive input end of the first logarithmic operator is connected with a reference zero potential;
the output end of the first logarithmic operator is connected with the inverting input end of the first subtracter;
the positive input end of the first logarithmic operator is connected with a reference zero potential;
the output end of the second logarithmic operator is connected with the non-inverting input end of the first subtracter;
the output end of the first subtracter is connected with the inverting input end of the first exponent operator;
the non-inverting input end of the first exponential operator is connected with a reference zero potential;
the output end of the first exponent operator is connected with the inverting input end of the first integrator;
the non-inverting input end of the first integrator is connected with a reference zero potential;
the first differential amplifier is used for obtaining the output voltage U O A voltage error value with the voltage reference value to obtain a control voltage according to the voltage error value;
the power arithmetic unit, the first proportional amplifier, the constant module, the first adder, the first logarithmic arithmetic unit, the second logarithmic arithmetic unit, the first subtracter, the first exponential arithmetic unit and the first integrator form an adaptive parameter matching module, which is used for performing mathematical operation according to the voltage error value to estimate the average current value of the inductance L of the high gain converter and serve as an integral reference value of the current of the switching tube S.
2. The control circuit for a high gain converter according to claim 1, wherein the module 4 single period control circuit comprises a second integrator, a second proportional amplifier, an SR flip-flop, a clock circuit module, a driver, wherein:
the non-inverting input end of the second integrator is connected with a reference zero potential;
the inverting input end of the second integrator is connected with the output end of the current acquisition circuit;
the output end of the second integrator is connected with the inverting input end of the first comparator;
the non-inverting input end of the second proportional amplifier is connected with the output end of the first integrator;
the output end of the second proportional amplifier is connected with the non-inverting input end of the first comparator;
the output end of the first comparator is connected with the reset end of the SR trigger;
the setting end of the SR trigger is connected with the clock circuit module;
the first output end of the SR trigger is connected with the driver and the reset circuit of the second integrator;
the output end of the driver is connected with the high-gain converter switching tube S.
3. The control circuit for a high gain converter according to claim 2, wherein in said module 4 single period control circuit,
the second integrator is used for carrying out integral operation on the switching tube current of the high-gain converter;
the second proportional amplifier is used for amplifying the integral reference value of the current of the switching tube S in proportion, and the amplification coefficient is K a ；
The first comparator is used for comparing the integral value of the switching tube S current with an integral reference value to generate a high level signal or a low level signal to control the SR trigger;
the SR trigger is used for controlling the on-off of the switching tube S and the working state of the second integrator when the high-level signal and the low-level signal are received.
4. The control circuit for a high gain converter according to claim 1, implemented by the adaptive parameter matching circuit and the module 4 single period control circuit, comprising:
output voltage U acquired by the voltage acquisition circuit O The average current predicted value of the high-gain converter inductance L is obtained through normalization self-adaptive parameter matching and integral operation with the error value of the reference voltage, and is used as the reference value of the integral value of the current of the switching tube S through a proportional amplifier;
comparing the current integral value of the switching tube S with a reference value of the current integral value of the switching tube S, thereby controlling the on-off of the switching tube, enabling the current integral value of the switching tube S to follow the reference value of the current integral value of the switching tube S, and simultaneously enabling the output voltage U to be O Is equal to the reference voltage.
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