CN113708646B - Phase shift sequence control method of bidirectional half-bridge three-level DC-DC converter - Google Patents
Phase shift sequence control method of bidirectional half-bridge three-level DC-DC converter Download PDFInfo
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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
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/3353—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having at least two simultaneously operating switches on the input side, e.g. "double forward" or "double (switched) flyback" converter
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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
- H02M1/083—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters for the ignition at the zero crossing of the voltage or the current
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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
- H02M1/088—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters for the simultaneous control of series or parallel connected semiconductor devices
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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
- H02M1/44—Circuits or arrangements for compensating for electromagnetic interference in converters or inverters
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- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Dc-Dc Converters (AREA)
Abstract
The invention provides a phase shift sequence control method of a bidirectional half-bridge three-level DC-DC converter, which comprises the following steps: the voltage sampling circuit is arranged at the output end of the bidirectional half-bridge three-level DC-DC converter, and the working condition of the converter is judged by the output voltage comparison unit; generating a phase shift sequence selection signal conforming to the working condition of the current converter by using a selection signal generating unit; generating phase shift sequence signals with the same frequency, the same duty ratio and different phase shift angles by using a phase shift sequence generating unit; and the phase shift sequence selection unit is used for selecting the combination of different phase shift sequence signals to control the on and off of each switching tube of the bidirectional half-bridge three-level DC-DC converter. The invention can realize faster dynamic response speed and higher anti-interference performance without using a load current loop and a PI compensation circuit and without increasing the design difficulty of a converter controller, and is suitable for application scenes with frequent load change.
Description
Technical Field
The invention relates to the technical field of power electronic converters, in particular to a phase shift sequence control method of a bidirectional half-bridge three-level DC-DC converter.
Background
Transportation is basic, pilot, strategic industry and important service industry in national economy, and is an important support for promoting sustainable development. As a typical representative of modern vehicles, high-speed trains are being developed in which on-board power electronic transformers replace on-board conventional traction transformers and four-quadrant rectifiers. The bidirectional half-bridge three-level DC-DC converter is used as a core component of the vehicle-mounted power electronic transformer and has the characteristics of high power density, high transmission efficiency and high reliability. In order to make the performance of the bidirectional half-bridge three-level DC-DC converter better and more flexible, a high-efficiency control technology is indispensable.
The conventional pulse sequence control is a special nonlinear control technology for a power electronic converter, and essentially, a plurality of control pulses with the same frequency and different duty ratios are preset as control signals of a switching tube of the converter. The control does not need a load current loop and a PI compensation circuit, the controller is simple in design, high in reliability, and high in dynamic response speed and anti-interference capability. However, the common control method of the bidirectional half-bridge three-level DC-DC converter is phase shift control, which requires square wave signals with the same frequency, 50% duty ratio and different phases as control signals of the switching tubes of the converter, and realizes power transmission by controlling the phase shift angles of the primary side switching tubes and the secondary side switching tubes of the converter. The conventional pulse sequence control cannot be used for realizing the effective control of the bidirectional half-bridge three-level DC-DC converter. Therefore, the research on the phase shift sequence control method with a plurality of phase shift angles has important significance for the flexible and efficient operation of the bidirectional half-bridge three-level DC-DC converter.
At present, the phase shift control of the bidirectional half-bridge three-level DC-DC converter is simple and easy to realize, but the problems that soft switching cannot be completely realized, the reflux power and the current stress are large when the primary side voltage and the secondary side voltage of the converter are not matched, and the system efficiency is seriously affected exist. Although the control flexibility can be improved by adding phase shifting angles between primary side switching tubes or secondary side switching tubes, the problems are improved to a certain extent. However, such a method of adding a phase shift angle makes the control design more complex, increases the compensation circuit, and is difficult to be applied to the occasions where the load of the converter is frequently changed and faster dynamic response is required.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a phase shift sequence control method of a bidirectional half-bridge three-level DC-DC converter. The switching tube of the bidirectional half-bridge three-level DC-DC converter is flexibly controlled by adopting a mode that a plurality of different phase-shift angle signals are combined into a phase-shift sequence, so that the converter can operate efficiently, the design difficulty of a converter controller is not increased, the faster dynamic response speed and higher anti-interference performance can be realized, and the method is suitable for application scenes with frequent load change.
In order to achieve the aim of the invention, the invention adopts the following technical scheme:
a phase shift sequence control method of a bidirectional half-bridge three-level DC-DC converter comprises the following steps:
s1, a built voltage sampling circuit is arranged at the output end of the bidirectional half-bridge three-level DC-DC converter, and the working condition of the converter is judged by an output voltage comparison unit.
S2, generating a phase shift sequence selection signal conforming to the working condition of the current converter by using the selection signal generation unit.
S3, generating phase shift sequence signals with the same frequency, the same duty ratio and different phase shift angles by using a phase shift sequence generating unit;
s4, selecting the combination of different phase shift sequence signals by using a phase shift sequence selection unit, and controlling the on and off of each switching tube of the bidirectional half-bridge three-level DC-DC converter. Further, the output voltage comparing unit includes a voltage sampling circuit and a comparator, wherein: the voltage sampling circuit is used for sampling the output voltage of the bidirectional half-bridge three-level DC-DC converter; the comparator is used for comparing the output of the voltage sampling circuit with an output voltage reference value and outputting a comparison result to the selection signal generation unit;
when sampling voltage V o Greater than reference value V ref When, the comparator outputs 1; conversely, the comparator outputs 0.
The voltage sampling circuit is composed of four parts, wherein the first part is an RC filter circuit composed of a resistor and a capacitor, the second part is a voltage clamping circuit composed of a diode, the third part is a voltage comparator for realizing zero-crossing comparison, and the fourth part is a voltage dividing circuit composed of a resistor and a capacitor and having a filter function.
Further, the selection signal generating unit includes a clock generator and a D flip-flop, wherein: the clock generator is used for generating a clock signal CLK with a specified frequency; the D trigger is used for converting the output of the output voltage comparison unit when each clock period arrivesChange to select signal QAnd maintaining one clock cycle, and repeating the process when the next clock cycle arrives;
further, when the output voltage comparator outputs 1, the D flip-flop outputs a signal q=1 and when each clock cycle arrivesWhen the output voltage comparator outputs 0, the D flip-flop outputs a signal q=0 andwherein the selection signal Q is responsible for controlling the selection of the signal with smaller phase shift angle, the selection signal +.>The selection of signals with larger phase shift angles is controlled respectively.
Further, the phase shift sequence generating unit includes a triangle wave generator, a comparator, and an SR flip-flop, wherein: the triangular wave generator is used for generating triangular wave signals with specified frequencies; the comparator is used for comparing the output of the triangular wave generator with the set different phase shift angles twice and outputting a comparison result; the SR flip-flop converts the output of the comparator into a phase shift sequence signal having the same frequency, the same duty cycle, but different phase shift angles, and outputs the phase shift sequence signal to the phase shift sequence selecting unit.
Further, the triangular wave signal generated by the triangular wave generator is first phase shifted by a set phase shift angleBy comparing with the comparator A, when the triangular wave signal is larger than the set phase shift angle +.>The comparator A outputs 1, otherwise the comparator A outputs 0; simultaneous triangular wave generatorCounter signal and set phase shift angle of triangular wave signal generated by generator>By comparison with the comparator B, when the inverse of the triangular wave signal is greater than the set phase shift angle +.>Comparator B outputs a 1, whereas comparator a outputs a 0.
Further, the output signal of the comparator a is input as the S terminal of the SR flip-flop, and the output signal of the comparator B is input as the R terminal of the SR flip-flop. When s=1 and r=0, the SR flip-flop outputs signals Q' =1 and R =0When s=0 and r=1, the SR flip-flop outputs signals Q' =0 and +.>When s=0 and r=0, the SR flip-flop outputs signals Q' and +.>Will maintain the output unchanged at the previous time; when s=1 and r=1, the SR flip-flop outputs signals Q' =0 and +.>
The phase shift angle which is the same as the frequency of the triangular wave signal is obtained through the switching of the output signal of the SR trigger between 0 and 1A square wave signal with a duty cycle of 50%. Changing the phase shift angle->The phase shift sequence signals with the same frequency, the same duty ratio and different phase shift angles are obtained.
Further, what is needed isThe phase shift sequence selection unit selects the phase shift sequence according to the sampling voltage V o And reference value V ref Selecting proper phase shift sequence signals as control signals of a switching tube of the bidirectional half-bridge three-level DC-DC converter in the current period through the combination of a plurality of logic gates until the next clock period comes;
when the input side V of the bidirectional half-bridge three-level DC-DC converter in The power supply is connected, and the output side V o When the load is connected, the transmission power of the converter flows forward. At this time if V o >V ref Selecting a phase shift sequence signal with small forward transmission power as a control signal of a switching tube of the current period converter; if V is o <V ref And selecting the phase shift sequence signal with high forward transmission power as the control signal of the switching tube of the current period converter. Wherein V is ref Is the output voltage reference.
When the input side V of the bidirectional half-bridge three-level DC-DC converter in Access load, output side V o When the power supply is connected, the transmission power of the converter circulates negatively. At this time if V in >V ref ' selecting a phase shift sequence signal with small negative transmission power as a control signal of a switching tube of the current period converter; if V is in <V ref And when' the phase shift sequence signal with high negative transmission power is selected as the control signal of the switching tube of the current period converter. Wherein V is ref ' is the output voltage reference.
Further, at the arrival of each clock cycle, if the selection signal q=1 andnamely, the phase shift sequence signal with the phase shift angle of 0 is selected to control the primary side switching tube S11 of the converter&S12 is turned on and off, and the inverse signal thereof controls the primary side switching tube S13 of the converter&S14, on-off, simultaneously selecting phase shift angle D L Is used for controlling a secondary side switch tube S21 of the converter by a phase shift sequence signal&S22 is turned on and off, and the inverse signal thereof controls the secondary side switch tube S23 of the converter&S24, on and off; if the selection signal Q=0 +.>Namely, the phase shift sequence signal with the phase shift angle of 0 is selected to control the primary side switching tube S11 of the converter&S12 is turned on and off, and the inverse signal controls the primary side switching tube S13 of the converter&S14, on-off, simultaneously selecting phase shift angle D H Is used for controlling a secondary side switch tube S21 of the converter by a phase shift sequence signal&S22 is turned on and off, and the inverse signal controls the secondary side switch tube S23 of the converter&S24 on and off.
Further, the phase shift angle of the control signal of the bidirectional half-bridge three-level DC-DC converter under the normal working conditionShould satisfy->Wherein: when->When the transmission power of the converter flows negatively; when (when)At this time, the transmission power of the inverter flows forward.
Further, the transmission power of the bidirectional half-bridge three-level DC-DC converter satisfies the formula:
wherein P is the transmission power of the bidirectional half-bridge three-level DC-DC converter, n is the transformation ratio of the secondary side to the primary side of the transformer in the converter, U in U is the input voltage of the converter o For the output voltage of the converter, f s The frequency of the control signal for the switching tube in the converter is also equal to the frequency of the output signals of the clock generator and the triangular wave generator,is the phase shift angle of the control signal for the switching tube in the converter.
Further, the transmission power formula of the bidirectional half-bridge three-level DC-DC converter can be expressed as:
wherein k is the voltage ratio of the voltages at two ends of the bidirectional half-bridge three-level DC-DC converter after the voltages are equivalent,n is the transformation ratio of the secondary side to the primary side of the transformer in the converter.
Further, the phase shift angle of the phase shift sequence signal should satisfy the formula:
wherein D is x The expected phase shift angle of the control signal of the bidirectional half-bridge three-level DC-DC converter; d (D) H For the phase shift angle of the phase shift sequence signal with the transmission power higher than the set threshold value, m represents the cycle number of the phase shift sequence signal with the transmission power higher than the set threshold value as the switch tube control signal for maintaining, and the value is a natural number; d (D) L For the phase shift angle of the phase shift sequence signal with transmission power lower than the set threshold, n represents the number of periods when the phase shift sequence signal with transmission power lower than the set threshold is maintained as the control signal of the switch tube, and the value is also a natural number.
Further, the phase shift angle D x 、D H 、D L The relation should be satisfied:
the invention has the following beneficial effects:
the invention provides a phase shift sequence control method which is used for flexibly and efficiently controlling a bidirectional half-bridge three-level DC-DC converter. The voltage sampling circuit and the comparator are utilized to judge the output voltage of the converter in real time, and a phase shift sequence selection signal in each clock period is generated by combining a D trigger and a clock generator; a plurality of phase shift sequence signals with the same frequency, the same duty cycle and different phase shift angles are generated through a comparator and an SR trigger. And selecting a proper phase shift sequence signal according to the magnitude relation of the output voltage of the converter in the current period, and further driving the switching tube of the converter to be turned on and off so as to realize positive or negative circulation of the transmission power of the converter. The method can avoid using a load current loop and a PI compensation circuit, does not increase the design difficulty of a converter controller, can realize faster dynamic response speed and higher anti-interference performance, and is suitable for application scenes with frequent load changes.
Drawings
Fig. 1 is a schematic flow chart of a phase shift sequence control method of a bidirectional half-bridge three-level DC-DC converter according to the present invention.
FIG. 2 is a schematic diagram of a control implementation of a bidirectional half-bridge three-level DC-DC converter according to an embodiment of the present invention;
fig. 3 is a schematic diagram of an output voltage of the bidirectional half-bridge three-level DC-DC converter according to an embodiment of the invention when a load is frequently changed.
Detailed Description
The following description of the embodiments of the present invention is provided to facilitate understanding of the present invention by those skilled in the art, but it should be understood that the present invention is not limited to the scope of the embodiments, and all the inventions which make use of the inventive concept are protected by the spirit and scope of the present invention as defined and defined in the appended claims to those skilled in the art.
In this embodiment, referring to fig. 1, the present invention provides a phase shift sequence control method of a bidirectional half-bridge three-level DC-DC converter, including the steps of:
s10, a voltage sampling circuit is established and arranged at the output end of the bidirectional half-bridge three-level DC-DC converter, and the working condition of the converter is judged by an output voltage comparison unit;
s20, generating a phase shift sequence selection signal conforming to the working condition of the current converter by using a selection signal generation unit;
s30, generating phase shift sequence signals with the same frequency, the same duty ratio and different phase shift angles by using a phase shift sequence generating unit;
s40, the phase shift sequence selection unit is used for selecting the combination of different phase shift sequence signals, and the on and off of each switching tube of the bidirectional half-bridge three-level DC-DC converter are controlled.
As an optimization scheme of the above embodiment, the output voltage comparing unit includes a voltage sampling circuit and a comparator, wherein: the voltage sampling circuit is used for sampling the output voltage of the bidirectional half-bridge three-level DC-DC converter; the comparator is used for comparing the output of the voltage sampling circuit with an output voltage reference value and outputting a comparison result to the selection signal generation unit;
then, when the voltage V is sampled o Greater than reference value V ref When, the comparator outputs 1; conversely, the comparator outputs 0.
As an optimization scheme of the embodiment, the voltage sampling circuit is composed of four parts, wherein the first part is an RC filter circuit composed of a resistor and a capacitor, the second part is a voltage clamping circuit composed of a diode, the third part is composed of a voltage comparator to realize zero-crossing comparison, and the fourth part is a voltage dividing circuit composed of a resistor and a capacitor and having a filtering function.
As an optimization of the above embodiment, the selection signal generating unit includes a clock generator and a D flip-flop, wherein: the clock generator is used for generating a clock signal CLK with a specified frequency; the D flip-flop is used for converting the output of the output voltage comparison unit into a selection signal Q and a selection signal Q when each clock period arrivesAnd maintaining one clock cycle, and repeating the process when the next clock cycle arrives;
as an optimization scheme of the above embodiment, when the output voltage comparator outputs 1, the D flip-flop outputs the signal q=1 and when every clock cycle arrivesWhen the output voltage comparator outputs 0, the D flip-flop output signals q=0 and +_ at every clock cycle>Wherein the selection signal Q is responsible for controlling the selection of the signal with smaller phase shift angle, the selection signal +.>The selection of signals with larger phase shift angles is controlled respectively.
As an optimization scheme of the above embodiment, the phase shift sequence generating unit includes a triangular wave generator, a comparator, and an SR flip-flop, wherein: the triangular wave generator is used for generating triangular wave signals with specified frequencies; the comparator is used for comparing the output of the triangular wave generator with the set different phase shift angles twice and outputting a comparison result; the SR flip-flop converts the output of the comparator into a phase shift sequence signal having the same frequency, the same duty cycle, but different phase shift angles, and outputs the phase shift sequence signal to the phase shift sequence selecting unit.
As an optimization scheme of the embodiment, the triangular wave signal generated by the triangular wave generator is firstly subjected to phase shift with a set phase shift angleBy comparing with the comparator A, when the triangular wave signal is larger than the set phase shift angle +.>The comparator A outputs 1, otherwise the comparator A outputs 0; at the same time, the inverse signal of the triangular wave signal generated by the triangular wave generator and the set phase shift angle +.>By comparison with the comparator B, when the inverse of the triangular wave signal is greater than the set phase shift angle +.>Comparator B outputs a 1, whereas comparator a outputs a 0.
As an optimization scheme of the above embodiment, the output signal of the comparator a is input as the S terminal of the SR flip-flop, and the output signal of the comparator B is input as the R terminal of the SR flip-flop. When s=1 and r=0, the SR flip-flop outputs signals Q' =1 and R =0When s=0 and r=1, the SR flip-flop outputs signals Q' =0 and +.>When s=0 and r=0, the SR flip-flop outputs signals Q' and +.>Will maintain the output unchanged at the previous time; when s=1 and r=1, the SR flip-flop outputs signals Q' =0 and +.>
As an optimization scheme of the embodiment, the switching of the output signal of the SR flip-flop between 0 and 1 results in a phase shift angle of the same frequency as that of the triangular wave signalA square wave signal with a duty cycle of 50%. Changing the phase shift angle->The phase shift sequence signals with the same frequency, the same duty ratio and different phase shift angles are obtained. As an optimization scheme of the above embodiment, the phase shift sequence selecting unit selects the phase shift sequence according to the sampling voltage V o And reference value V ref Is adapted by a combination of a plurality of logic gatesThe combined phase shift sequence signal is used as a control signal of a switching tube of the bidirectional half-bridge three-level DC-DC converter in the current period until the next clock period comes;
when the input side V of the bidirectional half-bridge three-level DC-DC converter in The power supply is connected, and the output side V o When the load is connected, the transmission power of the converter flows forward. At this time if V o >V ref Selecting a phase shift sequence signal with small forward transmission power as a control signal of a switching tube of the current period converter; if V is o <V ref And selecting the phase shift sequence signal with high forward transmission power as the control signal of the switching tube of the current period converter. Wherein V is ref Is the output voltage reference.
When the input side V of the bidirectional half-bridge three-level DC-DC converter in Access load, output side V o When the power supply is connected, the transmission power of the converter circulates negatively. At this time if V in >V ref ' selecting a phase shift sequence signal with small negative transmission power as a control signal of a switching tube of the current period converter; if V is in <V ref And when' the phase shift sequence signal with high negative transmission power is selected as the control signal of the switching tube of the current period converter. Wherein V is ref ' is the output voltage reference.
As an optimization scheme of the above embodiment, if the selection signal q=1 andnamely, the phase shift sequence signal with the phase shift angle of 0 is selected to control the primary side switching tube S11 of the converter&S12 is turned on and off, and the inverse signal thereof controls the primary side switching tube S13 of the converter&S14, on-off, simultaneously selecting phase shift angle D L Is used for controlling a secondary side switch tube S21 of the converter by a phase shift sequence signal&S22 is turned on and off, and the inverse signal thereof controls the secondary side switch tube S23 of the converter&S24, on and off; if the selection signal Q=0 +.>I.e. selecting phase shift anglePhase shift sequence signal control converter primary side switching tube S11 with phase shift sequence signal being 0&S12 is turned on and off, and the inverse signal controls the primary side switching tube S13 of the converter&S14, on-off, simultaneously selecting phase shift angle D H Is used for controlling a secondary side switch tube S21 of the converter by a phase shift sequence signal&S22 is turned on and off, and the inverse signal controls the secondary side switch tube S23 of the converter&S24 on and off.
V o >V ref V o <V ref As an optimization scheme of the embodiment, the phase shift angle of the control signal of the bidirectional half-bridge three-level DC-DC converter under normal working conditionsShould satisfy->Wherein: when->When the transmission power of the converter flows negatively; when->At this time, the transmission power of the inverter flows forward.
As an optimization scheme of the above embodiment, the transmission power of the bidirectional half-bridge three-level DC-DC converter satisfies the formula:
wherein P is the transmission power of the bidirectional half-bridge three-level DC-DC converter, n is the transformation ratio of the secondary side to the primary side of the transformer in the converter, U in U is the input voltage of the converter o For the output voltage of the converter, f s The frequency of the control signal for the switching tube in the converter is also equal to the frequency of the output signals of the clock generator and the triangular wave generator,is the phase shift angle of the control signal for the switching tube in the converter.
Then, the transmission power formula of the bidirectional half-bridge three-level DC-DC converter can also be expressed as:
wherein k is the voltage ratio of the voltages at two ends of the bidirectional half-bridge three-level DC-DC converter after the voltages are equivalent,n is the transformation ratio of the secondary side to the primary side of the transformer in the converter.
As an optimization scheme of the above embodiment, the phase shift angle of the phase shift sequence signal should satisfy the formula:
wherein D is x D is the expected phase shift angle of the control signal of the bidirectional half-bridge three-level DC-DC converter H 、D L For the phase shift angle of the different phase shift sequence signals, m and n represent the number of periods for which the different phase shift sequence signals are maintained as the switching tube control signals, and the values of the different phase shift sequence signals are natural numbers, namely m and n=0, 1,2 and ….
As an optimization of the above embodiment, the phase shift angle D x 、D H 、D L The relation should be satisfied:
according to the converter control implementation schematic shown in fig. 2, a bi-directional half-bridge three-level DC-DC converter is controlled. The change in output voltage when the converter load changes frequently is shown in fig. 3, in which: the output voltage reference value is 3300V.
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 flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations 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.
The principles and embodiments of the present invention have been described in detail with reference to specific examples, which are provided to facilitate understanding of the method and core ideas of the present invention; meanwhile, as those skilled in the art will have variations in the specific embodiments and application scope in accordance with the ideas of the present invention, the present description should not be construed as limiting the present invention in view of the above.
Those of ordinary skill in the art will recognize that the embodiments described herein are for the purpose of aiding the reader in understanding the principles of the present invention and should be understood that the scope of the invention is not limited to such specific statements and embodiments. Those of ordinary skill in the art can make various other specific modifications and combinations from the teachings of the present disclosure without departing from the spirit thereof, and such modifications and combinations remain within the scope of the present disclosure.
Claims (7)
1. The phase shift sequence control method of the bidirectional half-bridge three-level DC-DC converter is characterized by comprising the following steps of:
s1, an output voltage comparison unit is arranged at the output end of a bidirectional half-bridge three-level DC-DC converter, and the working condition of the converter is judged by the output voltage comparison unit;
s2, generating a phase shift sequence selection signal conforming to the working condition of the current converter by using a selection signal generation unit, wherein the selection signal generation unit comprises a clock generator and a D trigger, and the selection signal generation unit comprises: the clock generator is used for generating a clock signal CLK with a specified frequency; the D flip-flop is used for converting the output of the output voltage comparison unit into a selection signal when each clock period arrivesAnd->And maintaining one clock cycle, repeating the process when the next clock cycle arrives, and outputting a signal +.>Is->The method comprises the steps of carrying out a first treatment on the surface of the When the output voltage comparing unit outputs 0, the D flip-flop outputs a signal +.>Is->Wherein the selection signal +.>Is responsible for controlling the selection of signals with smaller phase shift angles, selecting signals +.>Respectively controlling the selection of signals with larger phase shift angles;
s3, generating phase shift sequence signals with the same frequency, the same duty ratio and different phase shift angles by using a phase shift sequence generating unit, wherein the phase shift sequence generating unit comprises a triangular wave generator, a comparator and an SR trigger, and the phase shift sequence generating unit comprises the following components: the triangular wave generator is used for generating triangular wave signals with specified frequencies; the comparator is used for comparing the output of the triangular wave generator with the set different phase shift angles twice and outputting a comparison result; the SR trigger converts the output of the comparator into phase-shift sequence signals with the same frequency, the same duty ratio and different phase shift angles and outputs the signals to a phase-shift sequence selection unit, and the phase-shift sequence selection unit selects the phase-shift sequence signals according to the sampling voltageV o And reference valueV ref Selecting proper phase shift sequence signals as control signals of a switching tube of the bidirectional half-bridge three-level DC-DC converter in the current period through the combination of a plurality of logic gates until the next clock period comes;
when (when)When the phase shift sequence signal with small transmission power is selected as the control signal of the switching tube of the current period converter; when->When the phase shift sequence signal with high transmission power is selected as the control signal of the switching tube of the current period converter;
s4, selecting the combination of different phase shift sequence signals by using a phase shift sequence selection unit, and controlling the on and off of each switching tube of the bidirectional half-bridge three-level DC-DC converter.
2. The method for controlling the phase shift sequence of a bi-directional half-bridge three-level DC-DC converter according to claim 1, wherein said output voltage comparing unit comprises a voltage sampling circuit and a comparator,
wherein: the voltage sampling circuit is used for sampling the output voltage of the bidirectional half-bridge three-level DC-DC converter;
the comparator is used for comparing the output of the voltage sampling circuit with an output voltage reference value and outputting a comparison result to the selection signal generation unit;
when sampling voltageV o Greater than a reference valueV ref When, the comparator outputs 1; conversely, the comparator outputs 0.
3. The method for controlling the phase shift sequence of a bidirectional half-bridge three-level DC-DC converter according to claim 1, wherein the phase shift angle of the control signal of the bidirectional half-bridge three-level DC-DC converter under normal working conditionsSatisfy the formula
,
Wherein: when (when)When the transmission power of the converter flows negatively; when->At this time, the transmission power of the inverter flows forward.
4. A method for phase shift sequence control of a bi-directional half-bridge three-level DC-DC converter according to claim 3, wherein the transmission power of the bi-directional half-bridge three-level DC-DC converter satisfies the formula:
wherein,Pis the transmission power of the bidirectional half-bridge three-level DC-DC converter,nfor the transformer to secondary to primary ratio of the transformer in the converter,U in for the input voltage of the converter,U o for the output voltage of the converter,f s the frequency of the control signal for the switching tube in the converter is also equal to the frequency of the output signals of the clock generator and the triangular wave generator,is the phase shift angle of the control signal for the switching tube in the converter.
5. The method for controlling the phase shift sequence of a bi-directional half-bridge three-level DC-DC converter according to claim 4, wherein the transmission power of the bi-directional half-bridge three-level DC-DC converter is expressed as:
wherein,kis the voltage ratio of the equivalent voltages at two ends of the bidirectional half-bridge three-level DC-DC converter,,nis the transformation ratio of the secondary side to the primary side of the transformer in the converter.
6. The phase shift sequence control method of a bidirectional half-bridge three-level DC-DC converter according to claim 5, wherein the phase shift angle of the phase shift sequence signal satisfies the formula:
wherein,the expected phase shift angle of the control signal of the bidirectional half-bridge three-level DC-DC converter; />For phase shift angles of phase shift sequence signals with transmission power above a set threshold,mthe phase shift sequence signal with transmission power higher than the set threshold value is used as the cycle number maintained by the control signal of the switch tube, and the value of the phase shift sequence signal is a natural number; />For phase shift angles of phase shift sequence signals with transmission power below a set threshold,nthe phase shift sequence signal with transmission power lower than the set threshold is used as the period number for maintaining the control signal of the switch tube, and the value is also a natural number.
7. The method for controlling the phase shift sequence of a bi-directional half-bridge three-level DC-DC converter according to claim 6, wherein said phase shift angle、/>The following relationships are satisfied:
。
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