CN110707956A - Control method, device and system of full-bridge three-level direct current converter - Google Patents

Control method, device and system of full-bridge three-level direct current converter Download PDF

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Publication number
CN110707956A
CN110707956A CN201911214905.8A CN201911214905A CN110707956A CN 110707956 A CN110707956 A CN 110707956A CN 201911214905 A CN201911214905 A CN 201911214905A CN 110707956 A CN110707956 A CN 110707956A
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switching tube
switching
driving signals
arm
bridge
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CN201911214905.8A
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CN110707956B (en
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王月武
宋晨
王国建
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Shenzhen Invt Electric Co Ltd
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Shenzhen Invt Electric Co Ltd
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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
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
    • H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
    • H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/483—Converters with outputs that each can have more than two voltages levels
    • H02M7/487—Neutral point clamped inverters
    • 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
    • H02M1/38—Means for preventing simultaneous conduction of switches
    • 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
    • H02M3/33569—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 several active switching elements
    • 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
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
    • H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
    • H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/53—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M7/537—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
    • H02M7/5387—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration
    • H02M7/53871—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration with automatic control of output voltage or current
    • 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
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
    • H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
    • H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/53—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M7/537—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
    • H02M7/539—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters with automatic control of output wave form or frequency
    • H02M7/5395—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters with automatic control of output wave form or frequency by pulse-width modulation

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Dc-Dc Converters (AREA)

Abstract

The embodiment of the invention discloses a control method, a device and a system of a full-bridge three-level direct current converter, wherein the control method comprises the steps of judging whether a bridge arm switching zone bit is a first preset value or a second preset value or not if a new PWM cycle is detected; if the bridge arm switching zone bit is a first preset value, updating and configuring PWM driving signals of eight switching tubes of the full-bridge three-level direct-current converter according to a first preset rule so as to perform chopping control on the switching tube Q1 and the switching tube Q4 of the left bridge arm and update the bridge arm switching zone bit to a second preset value; if the bridge arm switching zone bit is the second preset value, PWM driving signals of eight switching tubes of the full-bridge three-level direct-current converter are updated and configured according to a second preset rule, so that chopping control is performed on the switching tube Q5 and the switching tube Q8 of the right bridge arm, and the bridge arm switching zone bit is updated to be the first preset value. The embodiment of the invention not only can effectively balance the power loss of the corresponding switching tubes of the left and right bridge arms, but also can improve the distribution of thermal stress.

Description

Control method, device and system of full-bridge three-level direct current converter
Technical Field
The invention relates to the technical field of power electronics, in particular to a control method, a device and a system of a full-bridge three-level direct current converter.
Background
The full-bridge three-level direct current converter has the advantages of low voltage stress of a switching tube, easiness in realizing soft switching, high-frequency isolation and the like, and is widely applied to the fields of communication power supplies, new energy power generation, energy storage systems and the like. Fig. 1 shows a common LLC resonant full-bridge three-level dc converter. Each full-bridge three-level dc converter mainly includes a three-level Neutral Point Clamped (NPC) bridge arm, a resonant network (or an inductor/capacitor network), a high-frequency isolation transformer, and a rectifying circuit.
Compared with a full-bridge two-level direct-current converter, the full-bridge three-level direct-current converter has the advantages that the number of switching tubes is doubled, and the degree of freedom of control is correspondingly expanded. In the prior art, fig. 2 shows a control method for fixedly performing chopping control on outer tubes (a switching tube Q1 and a switching tube Q4) of a left arm, which is considered to be a preferable control method, but the control method always causes the outer tube of the left arm to be turned off when the current is large, and the conduction time of the outer tubes of the left arm and the right arm is not equal, so that the power loss of the outer tubes of the left arm and the right arm is not uniform, the thermal stress distribution is not uniform, and the reliability of the full-bridge three-level direct current converter is further influenced.
Disclosure of Invention
The embodiment of the invention provides a control method, a device and a system of a full-bridge three-level direct current converter, which can effectively balance the power loss of outer pipes of a left bridge arm and a right bridge arm of the full-bridge three-level direct current converter, improve the distribution of thermal stress, and improve the reliability and the service life of the full-bridge three-level direct current converter.
In a first aspect, an embodiment of the present invention provides a method for controlling a full-bridge three-level dc converter, configured in a processor to control the full-bridge three-level dc converter connected to the processor, where the full-bridge three-level dc converter includes a left bridge arm and a right bridge arm connected in parallel to each other, the left bridge arm includes a switch tube Q1, a switch tube Q2, a switch tube Q3, and a switch tube Q4 connected in series in sequence, the right bridge arm includes a switch tube Q5, a switch tube Q6, a switch tube Q7, and a switch tube Q8 connected in series in sequence, the method includes,
if a new PWM period is detected, judging whether the bridge arm switching zone bit is a first preset value or a second preset value;
if the bridge arm switching zone bit is a first preset value, updating and configuring PWM driving signals of eight switching tubes of the full-bridge three-level direct-current converter according to a first preset rule so as to perform chopping control on the switching tube Q1 and the switching tube Q4 of the left bridge arm, and updating the bridge arm switching zone bit to a second preset value before detecting the next PWM cycle;
if the bridge arm switching zone bit is a second preset value, updating and configuring PWM driving signals of eight switching tubes of the full-bridge three-level direct-current converter according to a second preset rule so as to perform chopping control on the switching tube Q5 and the switching tube Q8 of the right bridge arm, and updating the bridge arm switching zone bit to be a first preset value before detecting the next PWM cycle.
Further, if the bridge arm switching flag bit is a first preset value, updating and configuring PWM driving signals of eight switching tubes of the full-bridge three-level dc converter according to a first preset rule, so as to perform chopping control on the switching tube Q1 and the switching tube Q4 of the left bridge arm, and before detecting a next PWM cycle, updating the bridge arm switching flag bit to a second preset value, including:
if the bridge arm switching flag bit is a first preset value, controlling a switching tube Q1 and a switching tube Q4 of the left bridge arm to conduct complementarily according to respective PWM driving signals with the same preset duty ratio so as to realize chopping control of the switching tube Q1 and the switching tube Q4; wherein the preset duty cycle is greater than 0 and less than 50%;
controlling a switching tube Q2 and a switching tube Q3 of the left bridge arm to carry out complementary conduction according to respective PWM driving signals with 50% duty ratio;
controlling the rising edges of the PWM driving signals input into the switching tube Q1 and the switching tube Q2 of the left arm to be consistent, and controlling the rising edges of the PWM driving signals input into the switching tube Q3 and the switching tube Q4 of the left arm to be consistent;
controlling the PWM driving signals input into the switching tube Q5 and the switching tube Q6 of the right arm to be the same, and controlling the PWM driving signals input into the switching tube Q7 and the switching tube Q8 of the right arm to be the same;
controlling a switching tube Q5 and a switching tube Q6 of the right bridge arm to be in complementary conduction with a switching tube Q7 and a switching tube Q8 respectively according to PWM driving signals with 50% duty ratio;
controlling the rising edges of PWM driving signals input into a switching tube Q1 and a switching tube Q2 of the left bridge arm to be consistent with the rising edges of PWM driving signals input into a switching tube Q7 and a switching tube Q8 of the right bridge arm;
and before the next PWM period is detected, updating the bridge arm switching zone bit to a second preset value.
Further, the preset duty cycle is 25%.
Further, if the bridge arm switching flag bit is a second preset value, updating and configuring PWM driving signals of eight switching tubes of the full-bridge three-level dc converter according to a second preset rule, so as to perform chopping control on the switching tube Q5 and the switching tube Q8 of the right bridge arm, and before detecting a next PWM cycle, updating the bridge arm switching flag bit to a first preset value, including:
if the bridge arm switching flag bit is a second preset value, controlling the switching tube Q5 and the switching tube Q8 of the right bridge arm to conduct complementarily according to respective PWM driving signals with the same preset duty ratio so as to realize chopping control of the switching tube Q5 and the switching tube Q8; wherein the preset duty cycle is greater than 0 and less than 50%;
controlling a switching tube Q6 and a switching tube Q7 of the right bridge arm to carry out complementary conduction according to respective PWM driving signals with 50% duty ratio;
controlling the rising edges of the PWM driving signals input into the switching tube Q5 and the switching tube Q6 of the right arm to be consistent, and controlling the rising edges of the PWM driving signals input into the switching tube Q7 and the switching tube Q8 of the right arm to be consistent;
controlling the PWM driving signals input into the switching tube Q1 and the switching tube Q2 of the left arm to be the same, and controlling the PWM driving signals input into the switching tube Q3 and the switching tube Q4 of the left arm to be the same;
controlling a switching tube Q1 and a switching tube Q2 of the left bridge arm to be in complementary conduction with a switching tube Q3 and a switching tube Q4 respectively according to PWM driving signals with 50% duty ratio;
controlling the rising edges of PWM driving signals input into a switching tube Q7 and a switching tube Q8 of the right arm to be consistent with the rising edges of PWM driving signals input into a switching tube Q1 and a switching tube Q2 of the left arm;
and before the next PWM period is detected, updating the bridge arm switching zone bit to a first preset value.
Further, the first preset value is 1, and the second preset value is 0.
In a second aspect, an embodiment of the present invention further provides a control device configured in a processor to control a full-bridge three-level dc converter connected to the processor, where the full-bridge three-level dc converter includes a left bridge arm and a right bridge arm connected in parallel, the left bridge arm includes a switching tube Q1, a switching tube Q2, a switching tube Q3, and a switching tube Q4 connected in series in sequence, the right bridge arm includes a switching tube Q5, a switching tube Q6, a switching tube Q7, and a switching tube Q8 connected in series in sequence, the control device includes,
the judging unit is used for judging whether the bridge arm switching zone bit is a first preset value or a second preset value or not if a new PWM period is detected;
the first processing unit is used for updating and configuring PWM driving signals of eight switching tubes of the full-bridge three-level direct-current converter according to a first preset rule if the bridge arm switching zone bit is a first preset value so as to perform chopping control on the switching tube Q1 and the switching tube Q4 of the left bridge arm, and updating the bridge arm switching zone bit to a second preset value before detecting the next PWM cycle;
and the second processing unit is used for updating and configuring PWM driving signals of eight switching tubes of the full-bridge three-level direct-current converter according to a second preset rule if the bridge arm switching zone bit is a second preset value so as to perform chopping control on the switching tube Q5 and the switching tube Q8 of the right bridge arm, and updating the bridge arm switching zone bit to be a first preset value before detecting the next PWM cycle.
Further, the first processing unit includes:
the first chopping control unit is used for controlling the switching tube Q1 and the switching tube Q4 of the left bridge arm to be in complementary conduction according to respective PWM driving signals with the same preset duty ratio if the bridge arm switching flag bit is a first preset value, so that chopping control of the switching tube Q1 and the switching tube Q4 is realized; wherein the preset duty cycle is greater than 0 and less than 50%;
the first complementary control unit is used for controlling the switching tube Q2 and the switching tube Q3 of the left bridge arm to conduct complementarily according to respective PWM driving signals with 50% duty ratio;
the first adjusting unit is used for controlling the rising edges of the PWM driving signals input into the switching tube Q1 and the switching tube Q2 of the left arm to be consistent, and controlling the rising edges of the PWM driving signals input into the switching tube Q3 and the switching tube Q4 of the left arm to be consistent;
the second adjusting unit is used for controlling the PWM driving signals input into the switching tube Q5 and the switching tube Q6 of the right arm to be the same, and controlling the PWM driving signals input into the switching tube Q7 and the switching tube Q8 of the right arm to be the same;
the second complementary control unit is used for controlling the switching tube Q5 and the switching tube Q6 of the right bridge arm to be in complementary conduction with the switching tube Q7 and the switching tube Q8 according to PWM driving signals with 50% duty ratio;
the third adjusting unit is used for controlling the rising edges of the PWM driving signals input into the switching tube Q1 and the switching tube Q2 of the left arm to be consistent with the rising edges of the PWM driving signals input into the switching tube Q7 and the switching tube Q8 of the right arm;
and the first updating unit is used for updating the bridge arm switching zone bit to a second preset value before the next PWM period is detected.
Further, the preset duty cycle is 25%.
Further, the second processing unit includes:
the second chopping control unit is used for controlling the switching tube Q5 and the switching tube Q8 of the right bridge arm to be in complementary conduction according to respective PWM driving signals with the same preset duty ratio if the bridge arm switching flag bit is a second preset value, so that chopping control of the switching tube Q5 and the switching tube Q8 is realized; wherein the preset duty cycle is greater than 0 and less than 50%;
the third complementary control unit is used for controlling the switching tube Q6 and the switching tube Q7 of the right bridge arm to conduct complementarily according to respective PWM driving signals with 50% duty ratio;
the fourth adjusting unit is used for controlling the rising edges of the PWM driving signals input into the switching tube Q5 and the switching tube Q6 of the right arm to be consistent, and controlling the rising edges of the PWM driving signals input into the switching tube Q7 and the switching tube Q8 of the right arm to be consistent;
the fifth adjusting unit is used for controlling the PWM driving signals input into the switching tube Q1 and the switching tube Q2 of the left arm to be the same, and controlling the PWM driving signals input into the switching tube Q3 and the switching tube Q4 of the left arm to be the same;
the fourth complementary control unit is used for controlling the switching tube Q1 and the switching tube Q2 of the left bridge arm to be in complementary conduction with the switching tube Q3 and the switching tube Q4 according to PWM driving signals with 50% duty ratio;
the sixth adjusting unit is used for controlling the rising edges of the PWM driving signals input into the switching tube Q7 and the switching tube Q8 of the right arm to be consistent with the rising edges of the PWM driving signals input into the switching tube Q1 and the switching tube Q2 of the left arm;
and the second updating unit is used for updating the bridge arm switching zone bit to a first preset value before the next PWM period is detected.
In a third aspect, an embodiment of the present invention further provides a control system, including a processor, a memory, a full-bridge three-level dc converter, and an external power supply, where the memory is connected to the processor through the full-bridge three-level dc converter, and the external power supply is configured to supply power to the processor, the memory, and the full-bridge three-level dc converter, where the memory is configured to store a computer program, and the processor is configured to execute the computer program to perform the method according to the first aspect.
The control method provided by the embodiment of the invention not only can effectively balance the power loss of the switching tubes of the bridge arms of the full-bridge three-level direct current converter, improve the thermal stress distribution, but also can improve the reliability and prolong the service life of the full-bridge three-level direct current converter.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic diagram of a structure of a full-bridge three-level dc converter with LLC resonance;
fig. 2 is a schematic diagram of driving waveforms of each switching tube and waveforms of bridge arms voltage after chopping control is performed on an outer tube of a left bridge arm fixedly according to the prior art;
fig. 3 is a schematic flow chart of a control method of a full-bridge three-level dc converter according to an embodiment of the present invention;
fig. 4 is a schematic diagram of drive waveforms and bridge arm voltage waveforms of each switching tube after chopping control is alternately performed on outer tubes of left and right bridge arms in the control method of the full-bridge three-level dc converter according to the embodiment of the present invention;
FIG. 5 is a schematic flow chart of the substeps of step S102 in the embodiment of the present invention;
FIG. 6 is a schematic flow chart of the substeps of step S103 in the embodiment of the present invention;
FIG. 7 is a schematic block diagram of a control apparatus provided in an embodiment of the present invention;
FIG. 8 is a schematic block diagram of a first processing unit in an embodiment of the invention;
FIG. 9 is a schematic block diagram of a second processing unit in an embodiment of the invention;
fig. 10 is a schematic block diagram of a control system according to another embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 3 and 4, which are schematic flow charts of a control method of a full-bridge three-level dc converter according to an embodiment of the present invention, the embodiment of the present invention is configured in a processor to control the full-bridge three-level dc converter connected to the processor, the full-bridge three-level dc converter includes a left bridge arm and a right bridge arm that are connected in parallel, the left bridge arm includes a switching tube Q1, a switching tube Q2, a switching tube Q3, and a switching tube Q4 that are connected in series in sequence, and the right bridge arm includes a switching tube Q5, a switching tube Q6, a switching tube Q7, and a switching tube Q8 that are connected in series in sequence. In this embodiment, chopping control is mainly performed on the outer tubes of the left and right arms of the full-bridge three-level dc converter (in this embodiment, the outer tubes may refer to the switching tube Q1, the switching tube Q4, the switching tube Q5, and the switching tube Q8 in fig. 1, and the inner tubes may refer to the switching tube Q2, the switching tube Q3, the switching tube Q6, and the switching tube Q7 in fig. 1) alternately, so that power loss of the outer tubes of the left and right arms of the full-bridge three-level dc converter can be effectively balanced, thermal stress distribution is improved, and reliability of the full-bridge three-level dc converter is further improved. The method as shown in the figure may include steps S101 to S103, which are specifically as follows:
step S101, if a new PWM cycle is detected, whether the bridge arm switching zone bit is a first preset value or a second preset value is judged.
In the present embodiment, the PWM driving signals controlling the respective switching tubes in the full-bridge three-level dc converter have the same PWM period. Meanwhile, any two adjacent periods of the PWM driving signal input by each switching tube may be marked by different preset values of the bridge arm switching flag bit, and generally, the bridge arm switching flag bit may be a first preset value or a second preset value. And updating the corresponding bridge arm switching zone bit when a new PWM period is detected. For example, in the current PWM cycle, the bridge arm switching flag is a first preset value, the configuration PWM driving signal may be updated according to the preset first preset rule mentioned in step S102, and before the next PWM cycle is detected, the bridge arm switching flag is updated to a second preset value. And when the next PWM period is detected, judging whether the bridge arm switching zone bit is a first preset value or a second preset value so as to carry out the next operation. Optionally, the first preset value may be 1, and the second preset value may be 0, and of course, the specific values of the first preset value and the second preset value may also be set according to an actual situation, which is not limited in this embodiment.
And S102, if the bridge arm switching zone bit is a first preset value, updating and configuring PWM driving signals of eight switching tubes of the full-bridge three-level direct-current converter according to a first preset rule so as to perform chopping control on the switching tube Q1 and the switching tube Q4 of the left bridge arm, and updating the bridge arm switching zone bit to be a second preset value before detecting the next PWM cycle.
In this embodiment, if it is detected that the bridge arm switching flag is the first preset value, at this time, the PWM driving signals of the eight switching tubes of the full-bridge three-level dc converter may be updated and configured according to a first preset rule, where the first preset rule is a preset rule for limiting duty ratios and shapes of the PWM driving signals, and the first preset rule may also implement chopping control on the switching tube Q1 and the switching tube Q4 of the left bridge arm.
Specifically, in one embodiment, as shown in FIG. 5, the step S102 includes steps S201 to S207.
Step S201, if the bridge arm switching flag bit is a first preset value, controlling a switching tube Q1 and a switching tube Q4 of the left bridge arm to conduct complementarily according to respective PWM driving signals with the same preset duty ratio so as to realize chopping control of the switching tube Q1 and the switching tube Q4; wherein the preset duty cycle is greater than 0 and less than 50%.
In the present embodiment, to ensure balanced operation of each switching tube in the full-bridge three-level dc converter, generally, the PWM driving signals except for the switching tube Q1 and the switching tube Q4 are chopped, and the duty ratios of the PWM driving signals of the remaining switching tubes may be set to 50%. If the bridge arm switching flag bit is a first preset value, the switching tube Q1 and the switching tube Q4 of the left bridge arm can be controlled to conduct complementarily according to respective PWM driving signals with the same preset duty ratio. Optionally, the preset duty ratio is greater than 0 and less than 50%, that is, the preset duty ratio may be set to 25% or the like. For example, when the switching tube Q1 and the switching tube Q4 of the left arm are complementarily conducted, the duty ratio distributed in the first half period of the switching tube Q1 of the left arm is the same as the duty ratio distributed in the second half period of the switching tube Q4 of the left arm, that is, both the duty ratios are less than 50%, and the duty ratio distributed in the second half period of the switching tube Q1 of the left arm is the same as the duty ratio distributed in the first half period of the switching tube Q4 of the left arm, chopping control over the switching tube Q1 and the switching tube Q4 can be realized.
And step S202, controlling the switching tube Q2 and the switching tube Q3 of the left arm to carry out complementary conduction according to respective PWM driving signals with 50% duty ratio.
In this embodiment, the switching tube Q2 and the switching tube Q3 of the left arm are inner tubes of the left arm, so that the two are conducted complementarily, and the PWM driving signals of the switching tube Q2 and the switching tube Q3 both have a duty ratio of 50%. For example, the switching tube Q2 and the switching tube Q3 of the left arm are conducted complementarily, that is, the duty ratio distributed in the first half period of the switching tube Q2 of the left arm is the same as the duty ratio distributed in the second half period of the switching tube Q3 of the left arm, that is, both the duty ratios are 50%, and the duty ratio distributed in the second half period of the switching tube Q2 of the left arm is the same as the duty ratio distributed in the first half period of the switching tube Q3 of the left arm.
Step S203, controlling the rising edges of the PWM driving signals input to the switching tube Q1 and the switching tube Q2 of the left arm to be consistent, and controlling the rising edges of the PWM driving signals input to the switching tube Q3 and the switching tube Q4 of the left arm to be consistent.
In this embodiment, to ensure the conducting operation of the full-bridge three-level dc converter, the rising edges of the PWM driving signals input into the switching tube Q1 and the switching tube Q2 of the left arm are generally required to be consistent, and the rising edges of the PWM driving signals input into the switching tube Q3 and the switching tube Q4 of the left arm are also required to be consistent, so that the switching tube Q1 and the switching tube Q2 are ensured not to be simultaneously conducted with the switching tube Q3 and the switching tube Q4, thereby ensuring the normal operation of the full-bridge three-level dc converter.
And step S204, controlling the PWM driving signals input into the switching tube Q5 and the switching tube Q6 of the right arm to be the same, and controlling the PWM driving signals input into the switching tube Q7 and the switching tube Q8 of the right arm to be the same.
In this embodiment, it is further necessary to control the PWM driving signals input to the switching tube Q5 and the switching tube Q6 of the right arm to be the same, and control the PWM driving signals input to the switching tube Q7 and the switching tube Q8 of the right arm to be the same, so that the operating states of the switching tube Q5 and the switching tube Q6 of the right arm are ensured to be the same, and the operating states of the switching tube Q7 and the switching tube Q8 of the right arm are also the same.
And S205, controlling the switching tube Q5 and the switching tube Q6 of the right arm to be in complementary conduction with the switching tube Q7 and the switching tube Q8 respectively according to a PWM driving signal with 50% duty ratio.
In this embodiment, the switching tube Q5 and the switching tube Q6 of the right arm may be controlled to conduct complementarily with the switching tube Q7, and the PWM driving signals input to the two have a duty ratio of 50%. Since the PWM driving signals of the switching tube Q5 and the switching tube Q6 of the right arm are the same, and the PWM driving signals inputted to the switching tube Q7 and the switching tube Q8 of the right arm are controlled to be the same, it is understood that the switching tube Q5 and the switching tube Q6 are both complementarily conducted with the switching tube Q8.
And step S206, controlling the rising edges of the PWM driving signals input into the switching tube Q1 and the switching tube Q2 of the left arm to be consistent with the rising edges of the PWM driving signals input into the switching tube Q7 and the switching tube Q8 of the right arm.
In this embodiment, it is further necessary to control the rising edges of the PWM driving signals of the switching tube Q1 and the switching tube Q2 of the left arm, the switching tube Q7 of the right arm, and the switching tube Q8 to be consistent, so as to ensure that the left arm and the right arm can be correspondingly turned on in the same PWM period, and thus ensure the operating state of the full-bridge three-level dc converter.
And step S207, before the next PWM period is detected, updating the bridge arm switching zone bit to a second preset value.
In this embodiment, after the setting is completed, before the next PWM cycle is detected, the bridge arm switching flag needs to be updated to the second preset value, so as to perform a new flag.
And step S103, if the bridge arm switching zone bit is a second preset value, updating and configuring PWM driving signals of eight switching tubes of the full-bridge three-level direct-current converter according to a second preset rule so as to perform chopping control on the switching tube Q5 and the switching tube Q8 of the right bridge arm, and updating the bridge arm switching zone bit to be a first preset value before detecting the next PWM cycle.
In this embodiment, if it is detected that the bridge arm switching flag is the second preset value, at this time, the PWM driving signals of the eight switching tubes of the full-bridge three-level dc converter may be updated and configured according to a second preset rule, where the second preset rule is a preset rule for limiting the duty ratio and the shape of the PWM driving signal, and the second preset rule may also implement chopping control on the switching tube Q5 and the switching tube Q8 of the left bridge arm.
In one embodiment, as shown in fig. 6, in this embodiment, the step S103 includes steps S301 to S307.
Step S301, if the bridge arm switching flag bit is a second preset value, controlling the switching tube Q5 and the switching tube Q8 of the right bridge arm to conduct complementarily according to respective PWM driving signals with the same preset duty ratio so as to realize chopping control of the switching tube Q5 and the switching tube Q8; wherein the preset duty cycle is greater than 0 and less than 50%.
In the present embodiment, to ensure balanced operation of each switching tube in the full-bridge three-level dc converter, generally, the PWM driving signals except for the switching tube Q5 and the switching tube Q8 are chopped, and the duty ratios of the PWM driving signals of the remaining switching tubes may be set to 50%. If the bridge arm switching flag bit is a second preset value, the switching tube Q5 and the switching tube Q8 of the right bridge arm can be controlled to conduct complementarily according to respective PWM driving signals with the same preset duty ratio. Optionally, the preset duty ratio is greater than 0 and less than 50%, that is, the preset duty ratio may be set to 25% or the like. For example, the switching tube Q5 and the switching tube Q8 of the right arm are complementarily conducted, that is, the duty ratio distributed in the first half period of the switching tube Q5 of the right arm is the same as the duty ratio distributed in the second half period of the switching tube Q8 of the right arm, that is, both the duty ratios are less than 50%, and the duty ratio distributed in the second half period of the switching tube Q5 of the right arm is the same as the duty ratio distributed in the first half period of the switching tube Q8 of the right arm, so that the chopping control over the switching tube Q5 and the switching tube Q8 can be realized.
And step S302, controlling the switching tube Q6 and the switching tube Q7 of the right arm to carry out complementary conduction according to respective PWM driving signals with 50% duty ratio.
In this embodiment, the switching tube Q6 and the switching tube Q7 of the right arm are inner tubes of the left arm, so that the two are conducted complementarily, and the PWM driving signals of the switching tube Q6 and the switching tube Q7 both have a duty ratio of 50%. For example, the switching tube Q6 and the switching tube Q7 of the right arm are conducted complementarily, that is, the duty ratio distributed in the first half period of the switching tube Q6 of the right arm is the same as the duty ratio distributed in the second half period of the switching tube Q7 of the right arm, that is, both the duty ratios are 50%, and the duty ratio distributed in the second half period of the switching tube Q6 of the right arm is the same as the duty ratio distributed in the first half period of the switching tube Q7 of the left arm.
Step S303, controlling the rising edges of the PWM driving signals input to the switching tube Q5 and the switching tube Q6 of the right arm to be consistent, and controlling the rising edges of the PWM driving signals input to the switching tube Q7 and the switching tube Q8 of the right arm to be consistent.
In this embodiment, to ensure the conducting operation of the full-bridge three-level dc converter, the rising edges of the PWM driving signals input into the switching tube Q5 and the switching tube Q6 of the right arm are generally required to be consistent, and the rising edges of the PWM driving signals input into the switching tube Q7 and the switching tube Q8 of the right arm are also required to be consistent, so that the switching tube Q5 and the switching tube Q6 are ensured not to be simultaneously conducted with the switching tube Q7 and the switching tube Q8, thereby ensuring the normal operation of the full-bridge three-level dc converter.
And step S304, controlling the PWM driving signals input into the switching tube Q1 and the switching tube Q2 of the left arm to be the same, and controlling the PWM driving signals input into the switching tube Q3 and the switching tube Q4 of the left arm to be the same.
In this embodiment, it is further necessary to control the PWM driving signals input to the switching tube Q1 and the switching tube Q2 of the left arm to be the same, and control the PWM driving signals input to the switching tube Q3 and the switching tube Q4 of the left arm to be the same, so that the operating states of the switching tube Q1 and the switching tube Q2 of the left arm are ensured to be the same, and the operating states of the switching tube Q3 and the switching tube Q4 of the right arm are also the same.
And S305, controlling the switching tube Q1 and the switching tube Q2 of the left arm to be in complementary conduction with the switching tube Q3 and the switching tube Q4 respectively according to PWM driving signals with 50% duty ratio.
In this embodiment, the switching tube Q1 and the switching tube Q2 of the left arm may be controlled to conduct complementarily with the switching tube Q3, and the PWM driving signals input to the two have a duty ratio of 50%. Since the PWM driving signals of the switching tube Q1 and the switching tube Q2 of the left arm are the same, and the PWM driving signals inputted to the switching tube Q3 and the switching tube Q4 of the right arm are controlled to be the same, it is understood that the switching tube Q1 and the switching tube Q2 are both complementarily conducted with the switching tube Q4.
And step S306, controlling the rising edges of the PWM driving signals input into the switching tube Q7 and the switching tube Q8 of the right arm to be consistent with the rising edges of the PWM driving signals input into the switching tube Q1 and the switching tube Q2 of the left arm.
In this embodiment, it is further necessary to control the rising edges of the PWM driving signals of the switching tube Q7 and the switching tube Q8 of the right arm, the switching tube Q1 of the left arm, and the switching tube Q2 to be consistent, so as to ensure that the right arm and the left arm can be correspondingly turned on in the same PWM period, and thus ensure the operating state of the full-bridge three-level dc converter.
And step S307, before the next PWM period is detected, the bridge arm switching zone bit is updated to a first preset value.
In this embodiment, after the setting is completed, before the next PWM cycle is detected, the bridge arm switching flag needs to be updated to the first preset value, so as to perform a new flag.
In addition, the control method of the full-bridge three-level dc converter provided in the embodiment of the present invention may be applied to a processor to control the full-bridge three-level dc converter having the LLC resonance shown in fig. 1 and connected to the processor, may also control the full-bridge three-level dc converter having various inductor/capacitor networks such as an LC series resonance and a single resonance inductor, and may also control the full-bridge three-level dc converter having the inductor/capacitor networks in which energy flows in both directions.
According to the control method of the full-bridge three-level direct current converter, provided by the embodiment of the invention, the outer tubes of the left and right bridge arms of the full-bridge three-level direct current converter are subjected to chopping control alternately by judging and setting the bridge arm switching flag bit and interrupting in adjacent PWM periods, so that the power loss of the outer tubes of the left and right bridge arms of the full-bridge three-level direct current converter can be effectively balanced, the thermal stress distribution is further improved, and the reliability of the full-bridge three-level direct current converter is improved.
Fig. 7 is a schematic block diagram of a control device according to an embodiment of the present invention. As shown, the control device 100 is configured in a processor to control a full-bridge three-level dc converter connected to the processor, the full-bridge three-level dc converter includes a left arm and a right arm connected in parallel with each other, the left arm includes a switching tube Q1, a switching tube Q2, a switching tube Q3 and a switching tube Q4 connected in series in sequence, the right arm includes a switching tube Q5, a switching tube Q6, a switching tube Q7 and a switching tube Q8 connected in series in sequence, and the control device 100 includes: a judging unit 101, a first processing unit 102 and a second processing unit 103.
The determining unit 101 is configured to determine whether the bridge arm switching flag is a first preset value or a second preset value if a new PWM period is detected.
In the present embodiment, the PWM driving signals controlling the respective switching tubes in the full-bridge three-level dc converter have the same PWM period. Meanwhile, any two adjacent periods of the PWM driving signal input by each switching tube may be marked by different preset values of the bridge arm switching flag bit, and generally, the bridge arm switching flag bit may be a first preset value or a second preset value. And updating the corresponding bridge arm switching zone bit when a new PWM period is detected. For example, in the current PWM cycle, the bridge arm switching flag is a first preset value, the configuration PWM driving signal may be updated according to the preset first preset rule mentioned in step S102, and before the next PWM cycle is detected, the bridge arm switching flag is updated to a second preset value. And when the next PWM period is detected, judging whether the bridge arm switching zone bit is a first preset value or a second preset value so as to carry out the next operation. Optionally, the first preset value may be 1, and the second preset value may be 0, and of course, the specific values of the first preset value and the second preset value may also be set according to an actual situation, which is not limited in this embodiment.
The first processing unit 102 is configured to, if the bridge arm switching flag is a first preset value, update and configure PWM driving signals of eight switching tubes of the full-bridge three-level dc converter according to a first preset rule, so as to perform chopping control on the switching tube Q1 and the switching tube Q4 of the left bridge arm, and update the bridge arm switching flag to a second preset value before detecting a next PWM cycle.
In this embodiment, if it is detected that the bridge arm switching flag is the first preset value, at this time, the PWM driving signals of the eight switching tubes of the full-bridge three-level dc converter may be updated and configured according to a first preset rule, where the first preset rule is a preset rule for limiting duty ratios and shapes of the PWM driving signals, and the first preset rule may also implement chopping control on the switching tube Q1 and the switching tube Q4 of the left bridge arm.
Specifically, in one embodiment, as shown in fig. 8, the first processing unit 102 includes: a first chopping control unit 201, a first complementary control unit 202, a first adjusting unit 203, a second adjusting unit 204, a second complementary control unit 205, a third adjusting unit 206, and a first updating unit 207.
The first chopping control unit 201 is configured to control the switching tube Q1 and the switching tube Q4 of the left bridge arm to perform complementary conduction according to respective PWM driving signals with the same preset duty ratio if the bridge arm switching flag bit is a first preset value, so as to realize chopping control of the switching tube Q1 and the switching tube Q4; wherein the preset duty cycle is greater than 0 and less than 50%.
In the present embodiment, to ensure balanced operation of each switching tube in the full-bridge three-level dc converter, generally, the PWM driving signals except for the switching tube Q1 and the switching tube Q4 are chopped, and the duty ratios of the PWM driving signals of the remaining switching tubes may be set to 50%. If the bridge arm switching flag bit is a first preset value, the switching tube Q1 and the switching tube Q4 of the left bridge arm can be controlled to conduct complementarily according to respective PWM driving signals with the same preset duty ratio. Optionally, the preset duty ratio is greater than 0 and less than 50%, that is, the preset duty ratio may be set to 25% or the like. For example, when the switching tube Q1 and the switching tube Q4 of the left arm are complementarily conducted, the duty ratio distributed in the first half period of the switching tube Q1 of the left arm is the same as the duty ratio distributed in the second half period of the switching tube Q4 of the left arm, that is, both the duty ratios are less than 50%, and the duty ratio distributed in the second half period of the switching tube Q1 of the left arm is the same as the duty ratio distributed in the first half period of the switching tube Q4 of the left arm, chopping control over the switching tube Q1 and the switching tube Q4 can be realized.
And a first complementary control unit 202, configured to control the switching tube Q2 and the switching tube Q3 of the left arm to perform complementary conduction according to respective PWM driving signals with a duty ratio of 50%.
In this embodiment, the switching tube Q2 and the switching tube Q3 of the left arm are inner tubes of the left arm, so that the two are conducted complementarily, and the PWM driving signals of the switching tube Q2 and the switching tube Q3 both have a duty ratio of 50%. For example, the switching tube Q2 and the switching tube Q3 of the left arm are conducted complementarily, that is, the duty ratio distributed in the first half period of the switching tube Q2 of the left arm is the same as the duty ratio distributed in the second half period of the switching tube Q3 of the left arm, that is, both the duty ratios are 50%, and the duty ratio distributed in the second half period of the switching tube Q2 of the left arm is the same as the duty ratio distributed in the first half period of the switching tube Q3 of the left arm.
And the first adjusting unit 203 is configured to control rising edges of the PWM driving signals input to the switching tube Q1 and the switching tube Q2 of the left arm to be consistent, and control rising edges of the PWM driving signals input to the switching tube Q3 and the switching tube Q4 of the left arm to be consistent.
In this embodiment, to ensure the conducting operation of the full-bridge three-level dc converter, the rising edges of the PWM driving signals input into the switching tube Q1 and the switching tube Q2 of the left arm are generally required to be consistent, and the rising edges of the PWM driving signals input into the switching tube Q3 and the switching tube Q4 of the left arm are also required to be consistent, so that the switching tube Q1 and the switching tube Q2 are ensured not to be simultaneously conducted with the switching tube Q3 and the switching tube Q4, thereby ensuring the normal operation of the full-bridge three-level dc converter.
And a second adjusting unit 204, configured to control the PWM driving signals input to the switching tube Q5 and the switching tube Q6 of the right arm to be the same, and control the PWM driving signals input to the switching tube Q7 and the switching tube Q8 of the right arm to be the same.
In this embodiment, it is further necessary to control the PWM driving signals input to the switching tube Q5 and the switching tube Q6 of the right arm to be the same, and control the PWM driving signals input to the switching tube Q7 and the switching tube Q8 of the right arm to be the same, so that the operating states of the switching tube Q5 and the switching tube Q6 of the right arm are ensured to be the same, and the operating states of the switching tube Q7 and the switching tube Q8 of the right arm are also the same.
And the second complementary control unit 205 is configured to control the switching tube Q5 and the switching tube Q6 of the right arm to be complementarily conducted with the switching tube Q7 and the switching tube Q8, respectively, according to a PWM driving signal with a duty ratio of 50%.
In this embodiment, the switching tube Q5 and the switching tube Q6 of the right arm may be controlled to conduct complementarily with the switching tube Q7, and the PWM driving signals input to the two have a duty ratio of 50%. Since the PWM driving signals of the switching tube Q5 and the switching tube Q6 of the right arm are the same, and the PWM driving signals inputted to the switching tube Q7 and the switching tube Q8 of the right arm are controlled to be the same, it is understood that the switching tube Q5 and the switching tube Q6 are both complementarily conducted with the switching tube Q8.
And a third adjusting unit 206, configured to control rising edges of the PWM driving signals input to the switching tube Q1 and the switching tube Q2 of the left arm, and the switching tube Q7 and the switching tube Q8 of the right arm to be consistent.
In this embodiment, it is further necessary to control the rising edges of the PWM driving signals of the switching tube Q1 and the switching tube Q2 of the left arm, the switching tube Q7 of the right arm, and the switching tube Q8 to be consistent, so as to ensure that the left arm and the right arm can be correspondingly turned on in the same PWM period, and thus ensure the operating state of the full-bridge three-level dc converter.
And the first updating unit 207 is configured to update the bridge arm switching flag to a second preset value before detecting a next PWM cycle.
In this embodiment, after the setting is completed, before the next PWM cycle is detected, the bridge arm switching flag needs to be updated to the second preset value, so as to perform a new flag.
And the second processing unit 103 is configured to, if the bridge arm switching flag is a second preset value, update and configure PWM driving signals of eight switching tubes of the full-bridge three-level dc converter according to a second preset rule, so as to perform chopping control on the switching tube Q5 and the switching tube Q8 of the right bridge arm, and update the bridge arm switching flag to be the first preset value before detecting a next PWM cycle.
In this embodiment, if it is detected that the bridge arm switching flag is the second preset value, at this time, the PWM driving signals of the eight switching tubes of the full-bridge three-level dc converter may be updated and configured according to a second preset rule, where the second preset rule is a preset rule for limiting the duty ratio and the shape of the PWM driving signal, and the second preset rule may also implement chopping control on the switching tube Q5 and the switching tube Q8 of the left bridge arm.
Specifically, in an embodiment, as shown in fig. 9, the second processing unit 103 includes: a second chopping control unit 301, a third complementary control unit 302, a fourth adjusting unit 303, a fifth adjusting unit 304, a fourth complementary control unit 305, a sixth adjusting unit 306, and a second updating unit 307.
The second chopping control unit 301 is configured to control the switching tube Q5 and the switching tube Q8 of the right bridge arm to perform complementary conduction according to respective PWM driving signals with the same preset duty ratio if the bridge arm switching flag bit is a second preset value, so as to implement chopping control of the switching tube Q5 and the switching tube Q8; wherein the preset duty cycle is greater than 0 and less than 50%.
In the present embodiment, to ensure balanced operation of each switching tube in the full-bridge three-level dc converter, generally, the PWM driving signals except for the switching tube Q5 and the switching tube Q8 are chopped, and the duty ratios of the PWM driving signals of the remaining switching tubes may be set to 50%. If the bridge arm switching flag bit is a second preset value, the switching tube Q5 and the switching tube Q8 of the right bridge arm can be controlled to conduct complementarily according to respective PWM driving signals with the same preset duty ratio. Optionally, the preset duty ratio is greater than 0 and less than 50%, that is, the preset duty ratio may be set to 25% or the like. For example, the switching tube Q5 and the switching tube Q8 of the right arm are complementarily conducted, that is, the duty ratio distributed in the first half period of the switching tube Q5 of the right arm is the same as the duty ratio distributed in the second half period of the switching tube Q8 of the right arm, that is, both the duty ratios are less than 50%, and the duty ratio distributed in the second half period of the switching tube Q5 of the right arm is the same as the duty ratio distributed in the first half period of the switching tube Q8 of the right arm, so that the chopping control over the switching tube Q5 and the switching tube Q8 can be realized.
And a third complementary control unit 302, configured to control the switching tube Q6 and the switching tube Q7 of the right arm to perform complementary conduction according to respective PWM driving signals with a duty ratio of 50%.
In this embodiment, the switching tube Q6 and the switching tube Q7 of the right arm are inner tubes of the left arm, so that the two are conducted complementarily, and the PWM driving signals of the switching tube Q6 and the switching tube Q7 both have a duty ratio of 50%. For example, the switching tube Q6 and the switching tube Q7 of the right arm are conducted complementarily, that is, the duty ratio distributed in the first half period of the switching tube Q6 of the right arm is the same as the duty ratio distributed in the second half period of the switching tube Q7 of the right arm, that is, both the duty ratios are 50%, and the duty ratio distributed in the second half period of the switching tube Q6 of the right arm is the same as the duty ratio distributed in the first half period of the switching tube Q7 of the left arm.
And a fourth adjusting unit 303, configured to control rising edges of the PWM driving signals input to the switching tube Q5 and the switching tube Q6 of the right arm to be consistent, and control rising edges of the PWM driving signals input to the switching tube Q7 and the switching tube Q8 of the right arm to be consistent.
In this embodiment, to ensure the conducting operation of the full-bridge three-level dc converter, the rising edges of the PWM driving signals input into the switching tube Q5 and the switching tube Q6 of the right arm are generally required to be consistent, and the rising edges of the PWM driving signals input into the switching tube Q7 and the switching tube Q8 of the right arm are also required to be consistent, so that the switching tube Q5 and the switching tube Q6 are ensured not to be simultaneously conducted with the switching tube Q7 and the switching tube Q8, thereby ensuring the normal operation of the full-bridge three-level dc converter.
And a fifth adjusting unit 304, configured to control the PWM driving signals input to the switching tube Q1 and the switching tube Q2 of the left arm to be the same, and control the PWM driving signals input to the switching tube Q3 and the switching tube Q4 of the left arm to be the same.
In this embodiment, it is further necessary to control the PWM driving signals input to the switching tube Q1 and the switching tube Q2 of the left arm to be the same, and control the PWM driving signals input to the switching tube Q3 and the switching tube Q4 of the left arm to be the same, so that the operating states of the switching tube Q1 and the switching tube Q2 of the left arm are ensured to be the same, and the operating states of the switching tube Q3 and the switching tube Q4 of the right arm are also the same.
And a fourth complementary control unit 305, configured to control the switching tube Q1 and the switching tube Q2 of the left arm to perform complementary conduction with the switching tube Q3 and the switching tube Q4, respectively, according to a PWM driving signal with a duty ratio of 50%.
In this embodiment, the switching tube Q1 and the switching tube Q2 of the left arm may be controlled to conduct complementarily with the switching tube Q3, and the PWM driving signals input to the two have a duty ratio of 50%. Since the PWM driving signals of the switching tube Q1 and the switching tube Q2 of the left arm are the same, and the PWM driving signals inputted to the switching tube Q3 and the switching tube Q4 of the right arm are controlled to be the same, it is understood that the switching tube Q1 and the switching tube Q2 are both complementarily conducted with the switching tube Q4.
And a sixth adjusting unit 306, configured to control rising edges of the PWM driving signals input to the switching tube Q7 and the switching tube Q8 of the right arm, and the switching tube Q1 and the switching tube Q2 of the left arm to be consistent.
In this embodiment, it is further necessary to control the rising edges of the PWM driving signals of the switching tube Q7 and the switching tube Q8 of the right arm, the switching tube Q1 of the left arm, and the switching tube Q2 to be consistent, so as to ensure that the right arm and the left arm can be correspondingly turned on in the same PWM period, and thus ensure the operating state of the full-bridge three-level dc converter.
And a second updating unit 307, configured to update the bridge arm switching flag to the first preset value before detecting a next PWM cycle.
In this embodiment, after the setting is completed, before the next PWM cycle is detected, the bridge arm switching flag needs to be updated to the first preset value, so as to perform a new flag.
As shown in fig. 10, the embodiment of the present invention further provides a control system, where the control system 400 includes a processor 401, a memory 402, a full-bridge three-level dc converter 403, and an external power source, where the memory 402 is connected to the processor 401 through the full-bridge three-level dc converter 403, and the external power source is used to supply power to the processor 401, the memory 402, and the full-bridge three-level dc converter 403, where the memory 402 is used to store a computer program, and the processor 401 is used to run the computer program to perform the method provided in the foregoing embodiment.
In a specific implementation, the processor 401 and the full-bridge three-level dc converter 403 described in the embodiment of the present invention may execute the implementation manner described in the embodiment of the method for controlling a full-bridge three-level dc converter provided in the embodiment of the present invention, and may also execute the implementation manner of the apparatus described in the embodiment of the present invention, which is not described herein again.
While the invention has been described with reference to specific embodiments, the invention is not limited thereto, and various equivalent modifications and substitutions can be easily made by those skilled in the art within the technical scope of the invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims (10)

1. A control method of a full-bridge three-level DC converter, configured in a processor to control the full-bridge three-level DC converter connected to the processor, the full-bridge three-level DC converter includes a left arm and a right arm connected in parallel with each other, the left arm includes a switch tube Q1, a switch tube Q2, a switch tube Q3 and a switch tube Q4 connected in series in sequence, the right arm includes a switch tube Q5, a switch tube Q6, a switch tube Q7 and a switch tube Q8 connected in series in sequence, and the control method includes:
if a new PWM period is detected, judging whether the bridge arm switching zone bit is a first preset value or a second preset value;
if the bridge arm switching zone bit is a first preset value, updating and configuring PWM driving signals of eight switching tubes of the full-bridge three-level direct-current converter according to a first preset rule so as to perform chopping control on the switching tube Q1 and the switching tube Q4 of the left bridge arm, and updating the bridge arm switching zone bit to a second preset value before detecting the next PWM cycle;
if the bridge arm switching zone bit is a second preset value, updating and configuring PWM driving signals of eight switching tubes of the full-bridge three-level direct-current converter according to a second preset rule so as to perform chopping control on the switching tube Q5 and the switching tube Q8 of the right bridge arm, and updating the bridge arm switching zone bit to be a first preset value before detecting the next PWM cycle.
2. The control method according to claim 1, wherein if the bridge arm switching flag is a first preset value, the step of updating the PWM driving signals configuring the eight switching tubes of the full-bridge three-level dc converter according to a first preset rule to perform chopping control on the switching tube Q1 and the switching tube Q4 of the left bridge arm, and updating the bridge arm switching flag to a second preset value before detecting a next PWM cycle comprises:
if the bridge arm switching flag bit is a first preset value, controlling a switching tube Q1 and a switching tube Q4 of the left bridge arm to conduct complementarily according to respective PWM driving signals with the same preset duty ratio so as to realize chopping control of the switching tube Q1 and the switching tube Q4; wherein the preset duty cycle is greater than 0 and less than 50%;
controlling a switching tube Q2 and a switching tube Q3 of the left bridge arm to carry out complementary conduction according to respective PWM driving signals with 50% duty ratio;
controlling the rising edges of the PWM driving signals input into the switching tube Q1 and the switching tube Q2 of the left arm to be consistent, and controlling the rising edges of the PWM driving signals input into the switching tube Q3 and the switching tube Q4 of the left arm to be consistent;
controlling the PWM driving signals input into the switching tube Q5 and the switching tube Q6 of the right arm to be the same, and controlling the PWM driving signals input into the switching tube Q7 and the switching tube Q8 of the right arm to be the same;
controlling a switching tube Q5 and a switching tube Q6 of the right bridge arm to be in complementary conduction with a switching tube Q7 and a switching tube Q8 respectively according to PWM driving signals with 50% duty ratio;
controlling the rising edges of PWM driving signals input into a switching tube Q1 and a switching tube Q2 of the left bridge arm to be consistent with the rising edges of PWM driving signals input into a switching tube Q7 and a switching tube Q8 of the right bridge arm;
and before the next PWM period is detected, updating the bridge arm switching zone bit to a second preset value.
3. The control method according to claim 2, characterized in that the preset duty cycle is 25%.
4. The control method according to claim 1, wherein if the bridge arm switching flag is a second preset value, the step of updating the PWM driving signals configuring the eight switching tubes of the full-bridge three-level dc converter according to a second preset rule to perform chopping control on the switching tube Q5 and the switching tube Q8 of the right bridge arm, and updating the bridge arm switching flag to the first preset value before detecting a next PWM cycle comprises:
if the bridge arm switching flag bit is a second preset value, controlling the switching tube Q5 and the switching tube Q8 of the right bridge arm to conduct complementarily according to respective PWM driving signals with the same preset duty ratio so as to realize chopping control of the switching tube Q5 and the switching tube Q8; wherein the preset duty cycle is greater than 0 and less than 50%;
controlling a switching tube Q6 and a switching tube Q7 of the right bridge arm to carry out complementary conduction according to respective PWM driving signals with 50% duty ratio;
controlling the rising edges of the PWM driving signals input into the switching tube Q5 and the switching tube Q6 of the right arm to be consistent, and controlling the rising edges of the PWM driving signals input into the switching tube Q7 and the switching tube Q8 of the right arm to be consistent;
controlling the PWM driving signals input into the switching tube Q1 and the switching tube Q2 of the left arm to be the same, and controlling the PWM driving signals input into the switching tube Q3 and the switching tube Q4 of the left arm to be the same;
controlling a switching tube Q1 and a switching tube Q2 of the left bridge arm to be in complementary conduction with a switching tube Q3 and a switching tube Q4 respectively according to PWM driving signals with 50% duty ratio;
controlling the rising edges of PWM driving signals input into a switching tube Q7 and a switching tube Q8 of the right arm to be consistent with the rising edges of PWM driving signals input into a switching tube Q1 and a switching tube Q2 of the left arm;
and before the next PWM period is detected, updating the bridge arm switching zone bit to a first preset value.
5. The control method according to any one of claims 1 to 4, wherein the first preset value is 1 and the second preset value is 0.
6. A controller configured in a processor to control a full-bridge three-level dc converter connected to the processor, the full-bridge three-level dc converter including a left arm and a right arm connected in parallel with each other, the left arm including a switching tube Q1, a switching tube Q2, a switching tube Q3, and a switching tube Q4 connected in series in this order, the right arm including a switching tube Q5, a switching tube Q6, a switching tube Q7, and a switching tube Q8 connected in series in this order, the controller comprising:
the judging unit is used for judging whether the bridge arm switching zone bit is a first preset value or a second preset value or not if a new PWM period is detected;
the first processing unit is used for updating and configuring PWM driving signals of eight switching tubes of the full-bridge three-level direct-current converter according to a first preset rule if the bridge arm switching zone bit is a first preset value so as to perform chopping control on the switching tube Q1 and the switching tube Q4 of the left bridge arm, and updating the bridge arm switching zone bit to a second preset value before detecting the next PWM cycle;
and the second processing unit is used for updating and configuring PWM driving signals of eight switching tubes of the full-bridge three-level direct-current converter according to a second preset rule if the bridge arm switching zone bit is a second preset value so as to perform chopping control on the switching tube Q5 and the switching tube Q8 of the right bridge arm, and updating the bridge arm switching zone bit to be a first preset value before detecting the next PWM cycle.
7. The control device according to claim 6, wherein the first processing unit includes:
the first chopping control unit is used for controlling the switching tube Q1 and the switching tube Q4 of the left bridge arm to be in complementary conduction according to respective PWM driving signals with the same preset duty ratio if the bridge arm switching flag bit is a first preset value, so that chopping control of the switching tube Q1 and the switching tube Q4 is realized; wherein the preset duty cycle is greater than 0 and less than 50%;
the first complementary control unit is used for controlling the switching tube Q2 and the switching tube Q3 of the left bridge arm to conduct complementarily according to respective PWM driving signals with 50% duty ratio;
the first adjusting unit is used for controlling the rising edges of the PWM driving signals input into the switching tube Q1 and the switching tube Q2 of the left arm to be consistent, and controlling the rising edges of the PWM driving signals input into the switching tube Q3 and the switching tube Q4 of the left arm to be consistent;
the second adjusting unit is used for controlling the PWM driving signals input into the switching tube Q5 and the switching tube Q6 of the right arm to be the same, and controlling the PWM driving signals input into the switching tube Q7 and the switching tube Q8 of the right arm to be the same;
the second complementary control unit is used for controlling the switching tube Q5 and the switching tube Q6 of the right bridge arm to be in complementary conduction with the switching tube Q7 and the switching tube Q8 according to PWM driving signals with 50% duty ratio;
the third adjusting unit is used for controlling the rising edges of the PWM driving signals input into the switching tube Q1 and the switching tube Q2 of the left arm to be consistent with the rising edges of the PWM driving signals input into the switching tube Q7 and the switching tube Q8 of the right arm;
and the first updating unit is used for updating the bridge arm switching zone bit to a second preset value before the next PWM period is detected.
8. The control device of claim 7, wherein the preset duty cycle is 25%.
9. The control device according to claim 6, wherein the second processing unit includes:
the second chopping control unit is used for controlling the switching tube Q5 and the switching tube Q8 of the right bridge arm to be in complementary conduction according to respective PWM driving signals with the same preset duty ratio if the bridge arm switching flag bit is a second preset value, so that chopping control of the switching tube Q5 and the switching tube Q8 is realized; wherein the preset duty cycle is greater than 0 and less than 50%;
the third complementary control unit is used for controlling the switching tube Q6 and the switching tube Q7 of the right bridge arm to conduct complementarily according to respective PWM driving signals with 50% duty ratio;
the fourth adjusting unit is used for controlling the rising edges of the PWM driving signals input into the switching tube Q5 and the switching tube Q6 of the right arm to be consistent, and controlling the rising edges of the PWM driving signals input into the switching tube Q7 and the switching tube Q8 of the right arm to be consistent;
the fifth adjusting unit is used for controlling the PWM driving signals input into the switching tube Q1 and the switching tube Q2 of the left arm to be the same, and controlling the PWM driving signals input into the switching tube Q3 and the switching tube Q4 of the left arm to be the same;
the fourth complementary control unit is used for controlling the switching tube Q1 and the switching tube Q2 of the left bridge arm to be in complementary conduction with the switching tube Q3 and the switching tube Q4 according to PWM driving signals with 50% duty ratio;
the sixth adjusting unit is used for controlling the rising edges of the PWM driving signals input into the switching tube Q7 and the switching tube Q8 of the right arm to be consistent with the rising edges of the PWM driving signals input into the switching tube Q1 and the switching tube Q2 of the left arm;
and the second updating unit is used for updating the bridge arm switching zone bit to a first preset value before the next PWM period is detected.
10. A control system comprising a processor, a memory, a full bridge three level DC converter, and an external power source, the memory being connected to the processor in the full bridge three level DC converter, the external power source being configured to power the processor, the memory, and the full bridge three level DC converter, wherein the memory is configured to store a computer program, and the processor is configured to execute the computer program to perform the method of any of claims 1-5.
CN201911214905.8A 2019-12-02 2019-12-02 Control method, device and system of full-bridge three-level direct current converter Active CN110707956B (en)

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1845433A (en) * 2006-05-16 2006-10-11 中国科学院电工研究所 Bidirectional three-level soft switch DC/DC for superconducting energy storage and its voltage side pulse width controlling method
CN1866713A (en) * 2006-05-16 2006-11-22 中国科学院电工研究所 Three-level zero-voltage switch DC convertor and control method thereof
WO2014101362A1 (en) * 2012-12-31 2014-07-03 广东志成冠军集团有限公司 High-voltage direct current rectifying module
CN107707126A (en) * 2017-11-14 2018-02-16 山东奥太电气有限公司 A kind of three Level Full Bridge Sofe Switch convertor circuits and its control method
CN109302058A (en) * 2018-10-11 2019-02-01 昆明理工大学 A kind of direct current-direct current Modular multilevel converter and its control method with the output of three level of class

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1845433A (en) * 2006-05-16 2006-10-11 中国科学院电工研究所 Bidirectional three-level soft switch DC/DC for superconducting energy storage and its voltage side pulse width controlling method
CN1866713A (en) * 2006-05-16 2006-11-22 中国科学院电工研究所 Three-level zero-voltage switch DC convertor and control method thereof
WO2014101362A1 (en) * 2012-12-31 2014-07-03 广东志成冠军集团有限公司 High-voltage direct current rectifying module
CN107707126A (en) * 2017-11-14 2018-02-16 山东奥太电气有限公司 A kind of three Level Full Bridge Sofe Switch convertor circuits and its control method
CN109302058A (en) * 2018-10-11 2019-02-01 昆明理工大学 A kind of direct current-direct current Modular multilevel converter and its control method with the output of three level of class

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
陈志英等: "零电压开关PWM复合式全桥三电平变换器", 《中国电机工程学报》 *

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