CN115940625A - Flying capacitor type three-level BOOST circuit control method and system - Google Patents
Flying capacitor type three-level BOOST circuit control method and system Download PDFInfo
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
The invention provides a flying capacitor type three-level BOOST circuit control method and system, which are characterized in that a duty ratio is obtained through an output voltage and an expected voltage, two conditions are set in the range of the duty ratio, a difference value is made between the voltage of the flying capacitor and half of the output voltage, three results are obtained by comparing the difference value with a set threshold voltage, the two judgment conditions are combined to generate six modulation modes, driving signals are generated for a first IGBT (insulated gate bipolar transistor) and a second IGBT according to the selection result of the modulation modes, charging and discharging are carried out on the flying capacitor, distribution of capacitor energy is realized, the capacitor voltage is kept stable and balanced, the key problem that the voltage is too large or too small is effectively and reliably solved, and the flying capacitor type three-level BOOST circuit control method and system have the advantages of high response speed, convenience in maintenance and simplicity in operation.
Description
Technical Field
The invention relates to the technical field of power electronics, in particular to a flying capacitor type three-level BOOST circuit control method and system.
Background
The BOOST conversion circuit is a BOOST conversion circuit, can enable output voltage to be higher than input voltage, and is widely applied to the fields of switching power supplies, direct current motor transmission, photovoltaic power generation systems, electric automobile drive control and the like. The BOOST circuit is divided into a two-level circuit and a multi-level circuit, the two-level circuit is mainly used in the case of low voltage level, and the multi-level BOOST circuit is mainly used in the case of high voltage level, wherein the three-level circuit is the most common. Compared with a two-level BOOST circuit, the voltage stress of a power device of the three-level BOOST circuit is reduced by half, so that a higher-level voltage output can be realized by using a power device with a lower voltage-withstanding level, and the size and the cost of an inductor can be greatly reduced due to the fact that the input current ripple is greatly reduced, so that the three-level BOOST circuit has a wide application prospect in a high-voltage system.
In the control method of the flying capacitor type three-level BOOST circuit, two control loops are introduced into a controller in the traditional control method and respectively correspond to an output voltage control loop and a flying capacitor voltage control loop, and the two control loops are mutually coupled.
The selection of parameters of the flying capacitor voltage control loop is a technical problem at present, if the parameter setting is too large, the switching tube is always switched on or off, the problem that the circuit is out of control exists, if the parameter setting is too small, the flying capacitor voltage deviates from 1/2 bus voltage, and the risk of overvoltage damage exists in a power device of the circuit.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a control method and a control system of a flying capacitor type three-level BOOST circuit, which effectively control the flying capacitor voltage and enable the flying capacitor type three-level BOOST circuit to realize capacitor voltage sharing.
The invention is realized by the following technical scheme:
a control method of a flying capacitor type three-level BOOST circuit comprises the following steps:
calculating to obtain a duty ratio according to a difference value between the actual voltage output by the BOOST circuit and the expected voltage;
determining a preset range of the duty ratio according to a preset duty ratio range;
the method comprises the steps that a difference value is obtained by subtracting a flying capacitor voltage of the BOOST circuit from a half of an output voltage, and the difference value is compared with a preset voltage range to obtain a voltage range to which the difference value belongs;
determining a switching mode and a switching sequence of the BOOST circuit according to the voltage range and the preset range and a preset modulation mode; the preset modulation mode is combined by the preset range and the voltage range to obtain a corresponding basic working mode and a switching sequence thereof;
and generating driving signals of two IGBT tubes in the BOOST circuit according to the switching mode and the switching sequence, and controlling the BOOST circuit according to the driving signals.
Further, the voltage range of the difference is-U th ≤U f -U o /2≤U th 、U f -U o /2＜-U th And U f -U o /2＞U th Wherein, U f Is the voltage of a flying capacitor, U o Is the output voltage, U th Is the set threshold voltage.
Further, the preset duty ratio ranges from 0 to D < 0.5 and from 0.5 to D < 1, wherein D is the duty ratio.
Further, the basic working modes include:
the first mode is M 1 The first IGBT tube and the second IGBT tube are conducted correspondingly;
the second mode is M 2 The first IGBT tube is turned on and the second IGBT tube is turned off correspondingly;
the third mode is M 3 The first IGBT tube is turned off and the second IGBT tube is turned on correspondingly;
the fourth mode is M 4 And the first IGBT tube and the second IGBT tube are turned off correspondingly.
Further, the preset modulation mode is a modulation mode a, a modulation mode B, a modulation mode C, a modulation mode D, a modulation mode E and a modulation mode F;
the preset modulation mode is combined by the belonged preset range and the belonged voltage range to obtain the corresponding basic working mode and the switching sequence thereof is as follows:
the basic working modes and the switching sequence corresponding to the modulation mode A are as follows: m 3 -M 4 -M 2 -M 4 ；
The basic working modes and the switching sequence corresponding to the modulation mode B are as follows: m 3 -M 4 -M 3 -M 4 ；
The basic working modes and the switching sequence corresponding to the modulation mode C are as follows: m 2 -M 4 -M 2 -M 4 ；
The basic working modes and the switching sequence corresponding to the modulation mode D are as follows: m 3 -M 1 -M 2 -M 1 ；
The basic working modes corresponding to the modulation mode E and the switching sequence thereof are as follows: m is a group of 3 -M 1 -M 3 -M 1 ；
The basic working modes and the switching sequence corresponding to the modulation mode F are as follows: m 2 -M 1 -M 2 -M 1 。
Further, the modal duration of the modulation mode A is M 3 ：DT S /2；M 4 ：(1-D)T S /2；M 2 ：DT S /2；M 4 ：(1-D)T S /2；
The modal duration of the modulation mode B is respectively M 3 ：DT S /2；M 4 ：(1-D)T S /2；M 3 ：DTs/2；M 4 ：(1-D)T S /2；
The modal duration of the modulation mode C is M 2 ：DT S /2；M 4 ：(1-D)T S /2；M 2 ：DT S /2；M 4 ：(1-D)T S /2；
The modal duration of the modulation mode D is M 3 ：(1-D)T S /2；M 1 ：DT S /2；M 2 ：(1-D)T S /2；M 1 ：DT S /2；
The modal duration of the modulation mode E is M 3 ：(1-D)T S /2；M 1 ：DT S /2；M 3 ：(1-D)T S /2；M 1 ：DT S /2；
The modal duration of the modulation mode F is M 2 ：(1-D)T S /2；M 1 ：DT S /2；M 2 ：(1-D)T S /2；M 1 ：DT S /2；
Wherein, T S Is one switching cycle.
Further, the drive signal controls the BOOST circuit to obtain the following result:
the voltage of the flying capacitor generated in the modulation mode a is constant;
the voltage rise of the flying capacitor generated in modulation mode B;
voltage drop of the flying capacitor generated in modulation mode C;
the voltage of the flying capacitor generated in the modulation mode D is unchanged;
the voltage rise of the flying capacitor generated in modulation mode E;
the voltage drop of the flying capacitor generated in modulation mode F.
The invention provides a control system of flying capacitor type three-level BOOST circuit, comprising,
the duty ratio generating module is used for calculating the duty ratio according to the difference value between the actual voltage output by the BOOST circuit and the expected voltage;
the duty ratio comparison module is used for determining the preset range of the duty ratio according to the preset duty ratio range;
the flying capacitor voltage comparison module is used for obtaining a difference value by subtracting the flying capacitor voltage of the BOOST circuit from a half of the output voltage, and comparing the difference value with a preset voltage range to obtain a voltage range to which the difference value belongs;
the modulation mode selection module is used for determining the switching mode and the switching sequence of the BOOST circuit according to the voltage range and the preset modulation mode; the preset modulation mode is combined by the preset range and the voltage range to obtain a corresponding basic working mode and a switching sequence thereof;
and the driving circuit module is used for generating driving signals of two IGBT tubes in the BOOST circuit according to the switching mode and the switching sequence and controlling the BOOST circuit according to the driving signals.
A computer device, comprising:
a memory for storing a computer program;
a processor for implementing the steps of the method of controlling a flying capacitor type three-level BOOST circuit when executing the computer program.
A computer readable storage medium having stored thereon a computer program which, when executed by a processor, carries out the steps of a method of controlling a flying capacitor three-level BOOST circuit as described.
Compared with the prior art, the invention has the following beneficial technical effects:
the invention provides a flying capacitor type three-level BOOST circuit control method and a system, which are characterized in that a duty ratio is obtained through an output voltage and an expected voltage, a preset range of the duty ratio is judged, a difference value is made between the voltage of the flying capacitor and half of the output voltage, the voltage range is obtained by comparing the difference value with a set threshold voltage, corresponding switching modes and switching sequences are matched in a preset modulation mode through screening and limiting of the two judgment conditions, driving signals are generated for a first IGBT (insulated gate bipolar transistor) and a second IGBT according to a selection result of the modulation mode, the flying capacitor is charged and discharged, the distribution of capacitor energy is realized, the capacitor voltage is kept stable and balanced, the key problem that the voltage is too large or too small is effectively and reliably solved, and the flying capacitor control method and the system have the advantages of high response speed, convenience in maintenance and simplicity in operation.
Furthermore, four modes are obtained by analyzing the switching states of the first IGBT and the second IGBT, and the corresponding regulation mode is preset according to different modes and corresponding duty ratio and voltage requirements, so that classified fine regulation is realized.
Furthermore, the duty ratio and the mode are combined, so that the realization process of quantifying capacitor voltage sharing is improved, the system cost is reduced, the reliability of the system is improved, and the controllability and the stability of capacitor voltage are enhanced.
Further, whether the flying capacitor voltage meets a preset range or not and whether the duty ratio meets the preset range or not are judged, so that the flying capacitor voltage is divided into three conditions for analysis, then the three conditions are studied one by one and are arranged and combined with four modes to obtain the selection condition of a modulation mode, the selection strategy is ensured to be free of repetition and leakage, and the simplicity and the non-redundancy are realized.
Further, a switching period T of a preset modulation mode is set S The duration in the device is obtained according to the duty ratio, so that the working time of each mode is effectively controlled, and the influence on the capacitor voltage caused by long-term operation in one mode is avoided.
Furthermore, through the selection of the modulation mode, the influences on different voltages of the flying capacitor are obtained, the design of a control method is further simplified, the reliability of voltage equalization of the capacitor is greatly improved, and the cost of voltage equalization control is obviously reduced.
Drawings
Fig. 1 is a schematic diagram of a topology of a flying capacitor type three-level BOOST circuit.
FIG. 2 shows an operating mode M 1 Schematic representation.
FIG. 3 shows an operating mode M 2 Schematic illustration.
FIG. 4 shows an operating mode M 3 Schematic illustration.
FIG. 5 shows an operating mode M 4 Schematic representation.
Fig. 6 is a schematic diagram of a flying capacitor type three-level BOOST circuit control method and a control loop thereof.
FIG. 7 is a schematic diagram of the flying capacitor voltage waveform in modulation mode A.
FIG. 8 is a schematic diagram of a flying capacitor voltage waveform in modulation mode B.
FIG. 9 is a schematic diagram of the flying capacitor voltage waveform in modulation mode C.
FIG. 10 is a schematic diagram of the flying capacitor voltage waveform in modulation mode D.
FIG. 11 is a schematic diagram of the flying capacitor voltage waveform in modulation mode E.
FIG. 12 is a schematic diagram of a flying capacitor voltage waveform in modulation mode F.
Detailed Description
The present invention will now be described in further detail with reference to specific examples, which are intended to be illustrative, but not limiting, of the invention.
The invention provides a method and a system for controlling a flying capacitor type three-level BOOST circuit, wherein the topological structure of the flying capacitor type three-level BOOST circuit is shown in fig. 1 and comprises the following steps: first IGBT tube S 1 And a second IGBT tube S 2 A first diode D 1 A second diode D 2 Flying capacitor C f Output capacitor Co, inductor L.
The first IGBT tube S 1 And a second IGBT tube S 2 The on and off conditions of the flying capacitor type three-level BOOST circuit divide the working state of the flying capacitor type three-level BOOST circuit into four most basic modes: the first IGBT tube S 1 Conducting and second IGBT tube S 2 Belongs to a working mode M when being conducted 1 As shown in FIG. 2, the current path is input power source-inductor L-first IGBT tube S 1 -a first step ofTwo IGBT tubes S 2 Flying capacitor C f The anode is suspended and its voltage U f Keeping the original shape; the first IGBT tube S 1 Conducting and second IGBT tube S 2 Belongs to the working mode M when being turned off 2 As shown in FIG. 3, the current path is input power source-inductor L-first IGBT tube S 1 Flying capacitor C f A second diode D 2 -an output capacitance C o Current slave flying capacitor C f Negative pole flowing in, voltage U f Descending; the first IGBT tube S 1 Turn-off and second IGBT tube S 2 Belongs to a working mode M when in conduction 3 As shown in FIG. 4, the current path is input power-inductor L-first diode D 1 Flying capacitor C f Second IGBT tube S 2 Current slave flying capacitor C f Positive electrode flowing in, its voltage U f Rising; the first IGBT tube S 1 A second IGBT tube S is turned off 2 Belongs to the working mode M when being turned off 4 As shown in FIG. 5, the current path is the input power source-inductor L-first diode D 1 A second diode D 2 Output capacitance Co, flying capacitance C f The negative pole is suspended and the voltage U is f Remain unchanged.
As shown in fig. 6, the present invention provides a method for controlling a flying capacitor type three-level BOOST circuit, including:
calculating to obtain a duty ratio according to a difference value between the actual voltage output by the BOOST circuit and the expected voltage;
determining a preset range of the duty ratio according to a preset duty ratio range;
the method comprises the steps that the voltage of a flying capacitor of the BOOST circuit is differentiated from half of an output voltage to obtain a difference value, and the difference value is compared with a preset voltage range to obtain a voltage range to which the difference value belongs;
determining a switching mode and a switching sequence of the BOOST circuit according to the voltage range and the preset range and a preset modulation mode; the preset modulation mode is combined by the preset range and the voltage range to obtain a corresponding basic working mode and a switching sequence thereof;
and generating driving signals of two IGBT tubes in the BOOST circuit according to the switching mode and the switching sequence, and controlling the BOOST circuit according to the driving signals.
Specifically, the flying capacitor type three-level BOOST circuit control method includes the following steps:
(1) Duty cycle generation;
calculating to obtain a duty ratio D (D is more than or equal to 0 and less than or equal to 1) according to the difference value of the output actual voltage and the expected voltage, wherein the voltage gain of the flying capacitor type three-level BOOST circuit is consistent with the voltage gain formula of the two-level BOOST circuit, and the formula is that
The duty cycle can thus be calculated.
(2) Duty ratio comparison:
and the preset duty ratio ranges are that D is more than or equal to 0 and less than 0.5 and D is more than or equal to 0.5 and less than or equal to 1, and whether the duty ratio meets the condition that D is more than or equal to 0 and less than 0.5 or D is more than or equal to 0.5 and less than or equal to 1 is judged according to the duty ratio result obtained from the step (1), so that the preset range of the duty ratio is determined.
When D is more than or equal to 0 and less than 0.5, the working mode of the flying capacitor type three-level BOOST circuit is M 2 、M 3 、M 4 Switching between the two modes; when D is more than or equal to 0.5 and less than or equal to 1, the working mode of the flying capacitor type three-level BOOST circuit is M 2 、M 3 、M 1 To switch between.
(3) Flying capacitor voltage comparison:
obtaining a difference value by subtracting half of the output voltage from the flying capacitor voltage, wherein the preset voltage range is-U th ≤U f -U o /2≤U th Or U f -U o /2＜-U th Or U f -U o /2＞U th Wherein U is th Is set to 3%U o (ii) a Comparing the difference value with a preset voltage range, and judging whether the flying capacitor voltage meets-U th ≤U f -U o /2≤U th Or U f -U o /2＜-U th Or U f -U o /2＞U th And obtaining the voltage range of the difference value.
(4) Modulation mode selection:
selecting a preset modulation mode according to the duty ratio comparison result obtained in the step (2), namely the preset range of the duty ratio, and the comparison result of the flying capacitor voltage obtained in the step (3), namely the voltage range of the difference value; obtaining a switching mode and a switching sequence of the BOOST circuit according to the actually obtained affiliated voltage range and the actually obtained affiliated preset range;
the two judgment conditions are combined to generate a pre-modulation mode, and as the duty ratio is two conditions and the voltage is three conditions, six combinations are obtained to correspond to six preset modulation modes, so that the corresponding switching modes and switching sequences are selected by comparison.
The preset modulation mode comprises a modulation mode A, a modulation mode B, a modulation mode C, a modulation mode D, a modulation mode E and a modulation mode F;
when D is more than or equal to 0 and less than 0.5 and-U th ≤U f -U o /2≤U th When the flying capacitor type three-level BOOST circuit is switched, a modulation mode A is selected, and the switching mode of the flying capacitor type three-level BOOST circuit is M 2 、M 3 、M 4 The switching sequence is M 3 -M 4 -M 2 -M 4 ；
When D is more than or equal to 0 and less than 0.5 and U f -U o /2＜-U th When the flying capacitor type three-level BOOST circuit is switched, a modulation mode B is selected, and the switching mode of the flying capacitor type three-level BOOST circuit is M 3 、M 4 The switching sequence is M 3 -M 4 -M 3 -M 4 ；
When D is more than or equal to 0 and less than 0.5 and U f -U o /2＞U th When the flying capacitor type three-level BOOST circuit is in the time of switching, a modulation mode C is selected, and the switching mode of the flying capacitor type three-level BOOST circuit is M 2 、M 4 The switching sequence is M 2 -M 4 -M 2 -M 4 ；
When D is more than or equal to 0.5 and less than or equal to 1 and-U th ≤U f -U o /2≤U th Selecting a modulation mode D, wherein the switching mode of the flying capacitor type three-level BOOST circuit is M 1 、M 3 、M 4 In the same order of switchingSequence is M 3 -M 1 -M 2 -M 1；
When D is more than or equal to 0.5 and less than or equal to 1 and U is f -U o /2＜-U th Selecting a modulation mode E, wherein the switching mode of the flying capacitor type three-level BOOST circuit is M 1 、M 3 The switching sequence is M 3 -M 1 -M 3 -M 1 ；
When D is more than or equal to 0.5 and less than or equal to 1 and U is f -U o /2＞U th Selecting a modulation mode F, and selecting a switching mode M of the flying capacitor type three-level BOOST circuit 1 、M 2 The switching sequence is M 2 -M 1 -M 2 -M 1 。
In the switching modes and the switching sequence of the BOOST circuit, each switching basic working mode is set to be switched according to the switching sequence and is continued for a period of working time, so that the working time of each mode is effectively controlled, and the influence on the capacitor voltage caused by long-term working in one mode is avoided, namely the working mode duration of the flying capacitor type three-level BOOST circuit in a switching period Ts under different modulation modes is satisfied:
the mode duration of modulation mode A is M in sequence 3 ：DTs/2；M 4 ：(1-D)Ts/2；M 2 ：DTs/2；M 4 ：(1-D)Ts/2；
The modal duration of modulation mode B is M in order 3 ：DTs/2；M 4 ：(1-D)Ts/2；M 3 ：DTs/2；M 4 ：(1-D)Ts/2；
The modal duration of modulation mode C is M in order 2 ：DTs/2；M 4 ：(1-D)Ts/2；M 2 ：DTs/2；M 4 ：(1-D)Ts/2；
The modal duration of modulation mode D is M in order 3 ：(1-D)Ts/2；M 1 ：DTs/2；M 2 ：(1-D)Ts/2；M 1 ：DTs/2；
The modal duration of modulation mode E is M in sequence 3 ：(1-D)Ts/2；M 1 ：DTs/2；M 3 ：(1-D)Ts/2；M 1 ：DTs/2；
ModulationMode F has a modal duration of M 2 ：(1-D)Ts/2；M 1 ：DTs/2；M 2 ：(1-D)Ts/2；M 1 ：DTs/2。
(5) Generation of drive signals:
according to the result of (4) modulation mode selection, the first IGBT tube S is driven by the existing drive circuit between the main circuit and the control circuit 1 And a second IGBT tube S 2 And generating a driving signal, and generating the driving signal to control the flying capacitor type three-level BOOST circuit so as to charge and discharge the flying capacitor.
In this process, the six different pre-modulation modes will be applied to the flying capacitor C f Voltage U of f Different influences are generated, and the energy of the capacitor is distributed to keep the capacitor voltage balanced, namely the following results are generated respectively:
as shown in FIG. 7, in modulation mode A, the flying capacitor C f In the course of experience M 3 Modal time voltage U f Goes up, going through M 2 Modal voltage drop, going through M 4 Modal time voltage U f Is unchanged due to M 3 Duration of modality equal to M 2 Duration of mode, flying capacitor C, generally when said flying capacitor type three level BOOST is operating in modulation mode A f Voltage U of f And is not changed.
As shown in FIG. 8, in modulation mode B, flying capacitor C f In the course of experience M 3 Modal time voltage U f Rise, in the course of M 4 Modal time voltage U f Unchanged, flying capacitor C when the flying capacitor type three-level BOOST is operated in modulation mode B as a whole f Voltage U of f And (4) rising.
As shown in FIG. 9, in modulation mode C, the flying capacitor C f In the course of experience M 2 Modal time voltage U f Decrease in the course of M 4 Modal time voltage U f Unchanged, flying capacitor C when the flying capacitor type three-level BOOST is operated in modulation mode C as a whole f Voltage U of f And (4) descending.
As shown in fig. 10, in modulation mode D, flyAcross the capacitance C f In experience M 3 Modal time voltage U f Rise, in the course of M 2 Modal voltage drop, experiencing M 1 Modal time voltage U f Is unchanged due to M 3 Duration of modality equal to M 2 Duration of mode, flying capacitor C, when said flying capacitor type three-level BOOST is operated in modulation mode D as a whole f Voltage U of f And is not changed.
As shown in FIG. 11, in modulation mode E, flying capacitor C f In the course of experience M 3 Modal time voltage U f Rise, in the course of M 1 Modal time voltage U f Unchanged, flying capacitor C when the flying capacitor type three-level BOOST is operated in modulation mode E as a whole f Voltage U of f And (4) rising.
As shown in FIG. 12, in modulation mode F, flying capacitor C f In the course of experience M 2 Modal time voltage U f Decrease in the course of M 1 Modal time voltage U f Unchanged, flying capacitor C when the flying capacitor type three-level BOOST is operated in modulation mode F as a whole f Voltage U of f And (4) descending.
The invention also provides a control system of the flying capacitor type three-level BOOST circuit, which can realize the control method of the flying capacitor type three-level BOOST circuit, and provides corresponding hardware for the flying capacitor type three-level BOOST circuit, and the control method comprises the following steps:
the duty ratio generating module is used for calculating the duty ratio according to the difference value between the actual voltage output by the BOOST circuit and the expected voltage;
the duty ratio comparison module is used for determining the preset range of the duty ratio according to the preset duty ratio range;
the flying capacitor voltage comparison module is used for obtaining a difference value by subtracting the flying capacitor voltage of the BOOST circuit from a half of the output voltage, and comparing the difference value with a preset voltage range to obtain a voltage range to which the difference value belongs;
the modulation mode selection module is used for determining the switching mode and the switching sequence of the BOOST circuit according to the voltage range and the preset modulation mode; the preset modulation mode is combined by the preset range and the voltage range to obtain a corresponding basic working mode and a switching sequence thereof;
and the driving circuit module is used for generating driving signals of two IGBT tubes in the BOOST circuit according to the switching mode and the switching sequence and controlling the BOOST circuit according to the driving signals.
The present invention also provides a computer apparatus comprising:
a memory for storing a computer program;
and the processor is used for realizing the steps of the control method of the flying capacitor type three-level BOOST circuit when executing the computer program.
The present invention also provides a computer readable storage medium having stored thereon a computer program which, when executed by a processor, carries out the steps of the method of controlling a flying capacitor type three-level BOOST circuit.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting the same, and although the present invention is described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: modifications and equivalents may be made to the embodiments of the invention without departing from the spirit and scope of the invention, which is to be covered by the claims.
Claims (10)
1. A method for controlling a flying capacitor type three-level BOOST circuit, comprising:
calculating to obtain a duty ratio according to the difference value between the actual voltage output by the BOOST circuit and the expected voltage;
determining a preset range of the duty ratio according to a preset duty ratio range;
the method comprises the steps that a difference value is obtained by subtracting a flying capacitor voltage of the BOOST circuit from a half of an output voltage, and the difference value is compared with a preset voltage range to obtain a voltage range to which the difference value belongs;
determining a switching mode and a switching sequence of the BOOST circuit according to the voltage range and the preset range and a preset modulation mode; the preset modulation mode is combined by the preset range and the voltage range to obtain a corresponding basic working mode and a switching sequence thereof;
and generating driving signals of two IGBT tubes in the BOOST circuit according to the switching mode and the switching sequence, and controlling the BOOST circuit according to the driving signals.
2. The method as claimed in claim 1, wherein said difference is in a voltage range of-U th ≤U f -U o /2≤U th 、U f -U o /2＜-U th And U f -U o /2＞U th Wherein, U f Is the voltage of a flying capacitor, U o Is the output voltage, U th Is the set threshold voltage.
3. The method of claim 2, wherein the predetermined duty cycle ranges from 0 ≦ D < 0.5 and 0.5 ≦ D ≦ 1, where D is the duty cycle.
4. A method of controlling a flying capacitor type three-level BOOST circuit as claimed in claim 3, wherein said fundamental modes of operation include:
the first mode is M 1 The first IGBT tube and the second IGBT tube are conducted correspondingly;
the second mode is M 2 The first IGBT tube is turned on and the second IGBT tube is turned off correspondingly;
the third mode is M 3 The first IGBT tube is turned off and the second IGBT tube is turned on correspondingly;
the fourth mode is M 4 And the first IGBT tube and the second IGBT tube are turned off correspondingly.
5. The method for controlling a flying capacitor type three-level BOOST circuit as claimed in claim 4, wherein said preset modulation mode is modulation mode A, modulation mode B, modulation mode C, modulation mode D, modulation mode E and modulation mode F;
the preset modulation mode is combined by the belonged preset range and the belonged voltage range to obtain the corresponding basic working mode and the switching sequence thereof is as follows:
the basic working modes corresponding to the modulation mode A and the switching sequence thereof are as follows: m is a group of 3 -M 4 -M 2 -M 4 ；
The basic working modes and the switching sequence corresponding to the modulation mode B are as follows: m 3 -M 4 -M 3 -M 4 ；
The basic working modes and the switching sequence corresponding to the modulation mode C are as follows: m 2 -M 4 -M 2 -M 4 ；
The basic working modes and the switching sequence corresponding to the modulation mode D are as follows: m is a group of 3 -M 1 -M 2 -M 1 ；
The basic working modes corresponding to the modulation mode E and the switching sequence thereof are as follows: m 3 -M 1 -M 3 -M 1 ；
The basic working modes and the switching sequence corresponding to the modulation mode F are as follows: m is a group of 2 -M 1 -M 2 -M 1 。
6. The method as claimed in claim 5, wherein the modulation mode A has a mode duration of M 3 ：DT S /2；M 4 ：(1-D)T S /2；M 2 ：DT S /2；M 4 ：(1-D)T S /2；
The modal duration of the modulation mode B is M 3 ：DT S /2；M 4 ：(1-D)T S /2；M 3 ：DTs/2；M 4 ：(1-D)T S /2；
The modal duration of the modulation mode C is M 2 ：DT S /2；M 4 ：(1-D)T S /2；M 2 ：DT S /2；M 4 ：(1-D)T S /2；
The modal duration of the modulation mode D is M 3 ：(1-D)T S /2；M 1 ：DT S /2；M 2 ：(1-D)T S /2；M 1 ：DT S /2；
The modal duration of the modulation mode E is M 3 ：(1-D)T S /2；M 1 ：DT S /2；M 3 ：(1-D)T S /2；M 1 ：DT S /2；
The modal duration of the modulation mode F is M 2 ：(1-D)T S /2；M 1 ：DT S /2；M 2 ：(1-D)T S /2；M 1 ：DT S /2；
Wherein, T S Is one switching cycle.
7. The method as claimed in claim 5, wherein the driving signal controls the BOOST circuit to obtain the following result:
the voltage of the flying capacitor generated in the modulation mode a is not changed;
the voltage rise of the flying capacitor generated in modulation mode B;
voltage drop of the flying capacitor generated in modulation mode C;
the voltage of the flying capacitor generated in the modulation mode D is unchanged;
the voltage rise of the flying capacitor generated in modulation mode E;
the voltage drop of the flying capacitor generated in modulation mode F.
8. A control system of a flying capacitor type three-level BOOST circuit is characterized by comprising,
the duty ratio generating module is used for calculating the duty ratio according to the difference value between the actual voltage output by the BOOST circuit and the expected voltage;
the duty ratio comparison module is used for determining the preset range of the duty ratio according to the preset duty ratio range;
the flying capacitor voltage comparison module is used for obtaining a difference value by subtracting the flying capacitor voltage of the BOOST circuit from a half of the output voltage, and comparing the difference value with a preset voltage range to obtain a voltage range to which the difference value belongs;
the modulation mode selection module is used for determining the switching mode and the switching sequence of the BOOST circuit according to the voltage range and the preset modulation mode; the preset modulation mode is combined by the preset range and the voltage range to obtain a corresponding basic working mode and a switching sequence thereof;
and the driving circuit module is used for generating driving signals of two IGBT tubes in the BOOST circuit according to the switching mode and the switching sequence and controlling the BOOST circuit according to the driving signals.
9. A computer device, comprising:
a memory for storing a computer program;
a processor for implementing the steps of a method of controlling a flying capacitor type three-level BOOST circuit as claimed in any one of claims 1 to 7 when executing said computer program.
10. A computer readable storage medium, having stored thereon a computer program which, when executed by a processor, carries out the steps of a method of controlling a flying capacitor type three level BOOST circuit as claimed in any one of claims 1 to 7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211462313.XA CN115940625A (en) | 2022-11-21 | 2022-11-21 | Flying capacitor type three-level BOOST circuit control method and system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211462313.XA CN115940625A (en) | 2022-11-21 | 2022-11-21 | Flying capacitor type three-level BOOST circuit control method and system |
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| CN115940625A true CN115940625A (en) | 2023-04-07 |
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| CN202211462313.XA Pending CN115940625A (en) | 2022-11-21 | 2022-11-21 | Flying capacitor type three-level BOOST circuit control method and system |
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| Country | Link |
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| CN (1) | CN115940625A (en) |
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