CN117477960A - Topological structure of three-active full-bridge DC-DC converter - Google Patents

Topological structure of three-active full-bridge DC-DC converter Download PDF

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Publication number
CN117477960A
CN117477960A CN202210856440.1A CN202210856440A CN117477960A CN 117477960 A CN117477960 A CN 117477960A CN 202210856440 A CN202210856440 A CN 202210856440A CN 117477960 A CN117477960 A CN 117477960A
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China
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converter
bridge
switching
transformer
active full
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付超
孙平安
孙玉巍
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North China Electric Power University
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North China Electric Power University
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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
    • H02M3/33569—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
    • H02M3/33576—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 having at least one active switching element at the secondary side of an isolation transformer
    • 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
    • H02M1/0048—Circuits or arrangements for reducing losses
    • H02M1/0054—Transistor switching losses
    • 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
    • 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
    • H02M5/00—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases
    • H02M5/02—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc
    • H02M5/04—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc by static converters
    • H02M5/10—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc by static converters using transformers
    • 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
    • H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
    • H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
    • H02M7/12—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/145—Conversion of ac power input into dc 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 thyratron or thyristor type requiring extinguishing means
    • H02M7/155—Conversion of ac power input into dc 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 thyratron or thyristor type requiring extinguishing means using semiconductor devices only
    • H02M7/162—Conversion of ac power input into dc 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 thyratron or thyristor type requiring extinguishing means using semiconductor devices only in a bridge configuration
    • 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

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

Abstract

The invention discloses a three-active full-bridge DC-DC converter suitable for a wide voltage range, and relates to the field of DC converter devices. Combining multiple selectable turns ratio advantages, a gain V at a wide voltage is provided in /V out The novel direct current converter always keeps higher transmission efficiency under the change. The current stress and the root mean square value of the inductance current are reduced by controlling the access state of the primary and secondary side transformers under different voltage gains. The windings of the topological primary and secondary side transformers are wound on the same rootThe iron core is provided with a plurality of transformer transformation ratio selections, so that the working efficiency of the converter is further improved. The invention utilizes the combination of different bridge arms of the primary side and the secondary side to generate the topology with multiple converter transformation ratios, and selects the optimal working mode according to the adaptation principle of voltage gain and voltage transformation ratio so as to reduce the inductance current stress. The invention also provides a working mode switching control strategy based on single phase shift control, and zero current switching between transformers is realized. Meanwhile, in order to avoid the severe fluctuation of the converter at the critical switching point, a switching control strategy with hysteresis characteristics is adopted, so that the method has a wide application prospect.

Description

Topological structure of three-active full-bridge DC-DC converter
Technical Field
The invention relates to the technical field of power electronics, in particular to a topological structure of a three-active full-bridge DC-DC converter.
Background
The two-level double-active full-bridge DC-DC converter (DAB) has the characteristics of high power density, high voltage transmission ratio, electric isolation of input and output, easy realization of soft switching and the like, and DAB and variants thereof (three-phase, current feed, half-bridge DAB and the like) are widely studied in the fields of direct current systems including solar energy systems, data center power supplies, direct current source charge grid connection of fuel cells or new energy electric vehicles and the like.
Aiming at the DAB converter in the field, the DAB converter needs to adapt to the application scene when the output voltage, namely the network side voltage, is relatively constant and the input voltage, namely the source side voltage, is changed in a relatively wide range. When the voltage gain deviates from around 1, the inductor current of the DAB converter will increase, thereby increasing the conduction and switching losses of the device.
The invention selects the optimal working mode by utilizing the combination of different bridge arms of the primary side and the secondary side based on the adaptation principle of the voltage gain and the voltage conversion ratio so as to improve the working efficiency of the converter. Aiming at the problem of working mode switching smoothness, the invention provides a zero-current switching control strategy based on single phase shift control, which can effectively solve the problem.
Disclosure of Invention
The invention aims to provide a Three-active full-bridge DC-DC converter (TAB) based on a multi-voltage conversion ratio, so that when an input voltage, namely a source side voltage, changes in a wider range, the Three-active full-bridge DC-DC converter can always operate under higher working efficiency. The invention reduces the number of switching tubes, transformer windings and magnetic cores of the power electronic conversion circuit and reduces the volume of the transformer while providing multiple voltage conversion ratios.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:
a topological structure of a three-active full-bridge DC-DC converter comprises a transformer, a primary side converter module of the transformer and a secondary side converter module of the transformer; the transformerThe primary and secondary side current transformation module comprises: the primary side and the secondary side are all formed by connecting 3T-shaped bridge arms. The primary side is connected with the secondary side by winding two power electronic transformer windings on the same iron core. The invention connects four MOS tubes (S) 11 、S 12 、G 1 ) The T-shaped bridge arm is named as a bridge arm B 1 And so on to obtain bridge arm B 2 、B 3 、B 4 、B 5 、B 6 . The primary side and the secondary side of the two transformers are connected in series, the primary side winding and the secondary side winding are wound on the same iron core, and the transformer T 1 Number of turns N of primary winding A Number of turns N of secondary winding B Transformer T 2 Number of turns N of primary winding C Number of turns N of secondary winding D 。
In the above technical solution, the switch tube S 11 、S 12 、G 1 、S 21 、S 22 、G 2 、S 31 、S 32 、G 3 、S 41 、S 42 、G 4 、S 51 、S 52 、G 5 、S 61 、S 62 、G 6 Any of the switching tubes is any of the following: power field effect transistor, insulated gate bipolar transistor, triode or gate turn-off thyristor.
In the above technical solution, the switch tube S 11 、S 12 、G 1 、S 21 、S 22 、G 2 、S 31 、S 32 、G 3 、S 41 、S 42 、G 4 、S 51 、S 52 、G 5 、S 61 、S 62 、G 6 The two ends of any switch tube are connected with a reverse diode in parallel.
In the above technical solution, the diode is any one of the following: schottky diodes, fast recovery diodes, silicon diode diodes or silicon carbide diodes.
In the technical scheme, the primary side and the secondary side of the three-active full-bridge DC-DC converter are respectively connected with a filter capacitor in parallel.
In the technical scheme, when the topology is operated, the original secondary side 3T-shaped bridge arms are always in a state that two bridge arms are connected and one bridge arm is disconnected, and the topology can be divided into nine working modes.
In the above technical scheme, the primary side bridge arm B of the working mode 1 1 、B 2 Access, secondary side of transformer and bridge arm B 4 、B 5 Are connected; working mode 2 Primary side bridge arm B 2 、B 3 Access, secondary side of transformer and bridge arm B 5 、B 6 Are connected; working mode 3 Primary side bridge arm B 1 、B 2 Access, secondary side of transformer and bridge arm B 5 、B 6 Are connected; working mode 4 Primary side bridge arm B 2 、B 3 Access, secondary side of transformer and bridge arm B 4 、B 5 Are connected; working mode 5 Primary side bridge arm B 1 、B 3 Access, secondary side of transformer and bridge arm B 4 、B 5 Are connected; working mode 6 Primary side bridge arm B 1 、B 3 Access, secondary side of transformer and bridge arm B 5 、B 6 Are connected; working mode 7 Primary side bridge arm B 1 、B 2 Access, secondary side of transformer and bridge arm B 4 、B 6 Are connected; working mode 8 Primary side bridge arm B 2 、B 3 Access, secondary side of transformer and bridge arm B 4 、B 6 Are connected; working mode 9 Primary side bridge arm B 1 、B 3 Access, secondary side of transformer and bridge arm B 4 、B 6 Are connected.
In the technical scheme, different working modes are selected, and the range of the voltage adaptation ratio near the unit adaptation ratio is widened. There are 9 different modes of operation possible by controlling the switch.
In the technical scheme, the bridge arms of the primary side and the secondary side in nine working modes are different in access state, and the equivalent transformation ratios of the circuits are respectively N A /N B 、N C /N D 、N A /N D 、N C /N B 、(N A +N C )/N B 、(N A +N C )/N D 、N A /(N B +N D )、N C /(N B +N D )、(N A +N C )/(N B +N D )。
In the technical scheme, the topology of the converter in each working mode can be equivalent to DAB.
In the technical proposal, the switch tube G is controlled 1 ～G 9 The on-off of the coil can not only realize the switching among different working modes, but also cut off the reflux path of the induced current in the coil.
In the above technical solution, the switching problem of the working mode is essentially a switching problem of the transformer. Because the inductance current cannot be suddenly changed, the invention selects to switch the transformer at the zero crossing point moment of the inductance current in order to ensure the stability of the system under continuous operation.
In the technical scheme, under the control of triple phase shifting, the invention controls the zero crossing time and d of the inductance current 1 、d 2 、d 3 All of the above problems are related, and the analytic solving process at the zero crossing point moment is very complex. In order to ensure that the invention accurately switches at the moment of zero crossing of the inductance current, when the input voltage is detected to reach the critical switching point, the system is changed from triple phase shift control to single phase shift control.
In the technical scheme, a zero-current switching control strategy with hysteresis characteristic is adopted, so that the problem of frequent mode switching caused by voltage fluctuation at a critical switching point of a working mode is avoided.
By adopting the topological structure of the three-active full-bridge DC-DC converter, 9 different transformation ratios can be provided by adopting the double transformers, the number of magnetic cores is small, the volume of the topological structure is reduced, and the cost is reduced. Meanwhile, according to the change of input voltage, a proper working mode is selected by utilizing topology reconstruction, the converter is always operated near the voltage gain equal to 1, the voltage difference between two ends of the inductor is reduced, and the high-efficiency operation is kept.
Drawings
FIG. 1 is a schematic diagram of the topology of the present invention;
FIG. 2 is a schematic view of the present invention in mode 1;
FIG. 3 is a schematic view of the present invention in mode 2;
FIG. 4 is a schematic view of the invention in mode 3;
FIG. 5 is a schematic view of the present invention in mode 4;
FIG. 6 is a schematic view of the present invention in mode 5;
FIG. 7 is a schematic view of the present invention in mode 6;
FIG. 8 is a schematic view of the invention in mode 7;
FIG. 9 is a schematic view of the present invention in mode 8 of operation;
FIG. 10 is a schematic view of the present invention in mode 9;
FIG. 11 is a schematic diagram of a control method according to the present invention;
FIG. 12 is a graph of efficiency simulation for an embodiment of the present invention;
FIG. 13 is a waveform diagram illustrating the operation mode switching of the present invention;
Detailed Description
In order to make the technical problems, technical solutions and advantages to be solved by the present invention more clear, the present invention will be further described in detail with reference to the accompanying drawings.
Aiming at the problems of large conduction and switching loss and low working efficiency when the voltage gain deviates from 1 under the wide range change of the input voltage of the existing converter, the invention provides a topological structure of a three-active full-bridge DC-DC converter.
As shown in fig. 1, an embodiment of the present invention will be composed of a switching tube S 11 、G 1 、S 12 The bridge arm is named as a bridge arm B 1 And so on with B 2 、B 3 、B 4 、B 5 、B 6 . In operation, B 1 ～B 3 The bridge arm is always in a state of two bridge arms being connected and one bridge arm being disconnected, B 4 ～B 6 And the bridge arms are the same. The converter can be divided into nine modes of operation.
As shown in fig. 2, when the voltage gain is N A /N B In the vicinity, the operation mode 1 is operated, and the mode comprises the following steps:
step 1: bridge arm B 1 、B 2 、B 4 、B 5 And transformer T 1 Work at the same time G 1 、G 2 、G 4 、G 5 Conduction, G 3 、G 6 Breaking to cut off T 2 Is provided.
Step 2: topological primary side pass S 11 、S 12 、S 21 、S 22 、G 1 、G 2 And equivalent leakage inductance and transformer T 1 The primary side is connected.
Step 3: transformer T 1 The secondary side passes S 41 、S 42 、S 51 、S 52 、G 4 、G 5 Is connected with the output side.
As shown in fig. 3, when the voltage gain is N C /N D Nearby, operating mode 2 operates, which mode comprises the steps of:
step 1: bridge arm B 2 、B 3 、B 5 、B 6 And transformer T 2 Work at the same time G 2 、G 3 、G 5 、G 6 Conduction, G 1 、G 4 Breaking to cut off T 1 Is provided.
Step 2: topological primary side pass S 21 、S 22 、S 31 、S 32 、G 2 、G 3 And equivalent leakage inductance and transformer T 2 The primary side is connected.
Step 3: transformer T 2 The secondary side passes S 51 、S 52 、S 61 、S 62 、G 5 、G 6 Is connected with the output side.
As shown in fig. 4, when the voltage gain is N A /N D Nearby, operating mode 3 operates, which mode comprises the steps of:
step 1: bridge arm B 1 、B 2 、B 5 、B 6 Transformer T 1 Primary winding and transformer T 2 Secondary winding operation, while G 1 、G 2 、G 5 、G 6 Conduction, G 3 、G 4 The return path of the induced current is disconnected to shut off.
Step 2: topological primary side pass S 11 、S 12 、S 21 、S 22 、G 1 、G 2 And equal toLeakage inductance and transformer T 1 The primary side is connected.
Step 3: transformer T 2 The secondary side passes S 51 、S 52 、S 61 、S 62 、G 5 、G 6 Is connected with the output side.
As shown in fig. 5, when the voltage gain is N C /N B Nearby, the operating mode 4 operates, which mode comprises the following steps:
step 1: bridge arm B 2 、B 3 、B 4 、B 5 Transformer T 2 Primary winding and transformer T 1 Secondary winding operation, while G 2 、G 3 、G 4 、G 5 Conduction, G 1 、G 6 The return path of the induced current is disconnected to shut off.
Step 2: topological primary side pass S 21 、S 22 、S 31 、S 32 、G 2 、G 3 And equivalent leakage inductance and transformer T 2 The primary side is connected.
Step 3: transformer T 1 The secondary side passes S 41 、S 42 、S 51 、S 52 、G 4 、G 5 Is connected with the output side.
As shown in fig. 6, when the voltage gain is equal to (N A +N C )/N B Nearby, the operating mode 5 operates, which comprises the following steps:
step 1: bridge arm B 1 、B 3 、B 4 、B 5 Transformer T 1 、T 2 Primary winding and transformer T 1 Secondary winding operation, while G 1 、G 3 、G 4 、G 5 Conduction, G 2 、G 6 The return path of the induced current is disconnected to shut off.
Step 2: topological primary side pass S 11 、S 12 、S 31 、S 32 、G 1 、G 3 And equivalent leakage inductance and transformer T 1 、T 2 The primary side is connected.
Step 3: transformer T 1 Vice side is led toS is too much 41 、S 42 、S 51 、S 52 、G 4 、G 5 Is connected with the output side.
As shown in fig. 7, when the voltage gain is equal to (N A +N C )/N D Nearby, the operating mode 6 operates, which mode comprises the following steps:
step 1: bridge arm B 1 、B 3 、B 5 、B 6 Transformer T 1 、T 2 The primary winding and the secondary winding of the transformer T2 work at the same time G 1 、G 3 、G 5 、G 6 Conduction, G 2 、G 4 The return path of the induced current is disconnected to shut off.
Step 2: topological primary side pass S 11 、S 12 、S 31 、S 32 、G 1 、G 3 And equivalent leakage inductance and transformer T 1 、T 2 The primary side is connected.
Step 3: transformer T 2 The secondary side passes S 51 、S 52 、S 61 、S 62 、G 5 、G 6 Is connected with the output side.
As shown in fig. 8, when the voltage gain is N A /(N B +N D ) Nearby, the operating mode 7 operates, which mode comprises the following steps:
step 1: bridge arm B 1 、B 2 、B 4 、B 6 Transformer T 1 Primary winding and transformer T 1 、T 2 Secondary winding operation, while G 1 、G 2 、G 4 、G 6 Conduction, G 3 、G 5 The return path of the induced current is disconnected to shut off.
Step 2: topological primary side pass S 11 、S 12 、S 21 、S 22 、G 1 、G 2 And equivalent leakage inductance and transformer T 1 The primary side is connected.
Step 3: transformer T 1 、T 2 The secondary side passes S 41 、S 42 、S 61 、S 62 、G 4 、G 6 Is connected with the output side.
As shown in fig. 9, when the voltage gain is N C /(N B +N D ) Nearby, the operating mode 8 operates, which mode comprises the following steps:
step 1: bridge arm B 2 、B 3 、B 4 、B 6 Transformer T 2 Primary winding and transformer T 1 、T 2 Secondary winding operation, while G 2 、G 3 、G 4 、G 6 Conduction, G 1 、G 5 The return path of the induced current is disconnected to shut off.
Step 2: topological primary side pass S 21 、S 22 、S 31 、S 32 、G 2 、G 3 And equivalent leakage inductance and transformer T 2 The primary side is connected.
Step 3: transformer T 1 、T 2 The secondary side passes S 41 、S 42 、S 61 、S 62 、G 4 、G 6 Is connected with the output side.
As shown in fig. 10, when the voltage gain is equal to (N A +N C )/(N B +N D ) Nearby, the operating mode 9 operates, which comprises the following steps:
step 1: bridge arm B 1 、B 3 、B 4 、B 6 Transformer T 1 、T 2 Primary winding and transformer T 1 、T 2 Secondary winding operation, while G 1 、G 3 、G 4 、G 6 Conduction, G 2 、G 5 The return path of the induced current is disconnected to shut off.
Step 2: topological primary side pass S 12 、S 12 、S 31 、S 32 、G 1 、G 3 And equivalent leakage inductance and transformer T 1 、T 2 The primary side is connected.
Step 3: transformer T 1 、T 2 The secondary side passes S 41 、S 42 、S 61 、S 62 、G 4 、G 6 Is connected with the output side.
Taking the working mode 1 as an example, fig. 11 shows a schematic diagram of a control method in the working mode, and the control method is also applicable to other working modes. Wherein S is 11 On time v ao Is at high level, S 12 On time v ao Is low.
Switch tube S in the invention 11 、S 12 、S 21 、S 22 、S 31 、S 32 、S 41 、S 42 、S 51 、S 52 、S 61 、S 62 、G 1 、G 2 、G 3 、G 4 、G 5 、G 6 SiC MOSFETs are used.
As shown in fig. 12, the present invention draws the actual measurement efficiency curve of the present invention and DAB topology through simulation cases. The experimental parameters are shown in table 1.
TABLE 1
As can be seen from fig. 12, the DAB operating efficiency is slightly higher than that of the three-active full-bridge DC-DC converter when the transformation ratio is about 4/3 because the DAB has 4 switching tubes less loss than that of the three-active full-bridge DC-DC converter, but the operating efficiency of the three-active full-bridge DC-DC converter is significantly higher than that of the conventional DAB topology in a wider input voltage range because the proposed converter topology has a multi-transformation ratio characteristic.
As shown in fig. 13, the embodiment of the present invention takes the switching back and forth between the working mode 1 and the working mode 2 and between the working mode 2 and the working mode 9 as an example, and verifies the practicability of the transformer zero current switching control strategy based on single phase shift control. The three-active full-bridge DC-DC converter can be switched at the zero crossing point moment of the inductance current, so that the problem of mode switching smoothness is solved.

Claims (10)

1. The utility model provides a three initiative full-bridge DC-DC converter suitable for under wide voltage range changes which characterized in that: the input side and the output side are formed by connecting 3T-shaped bridge arms, the primary side and the secondary side are connected through two transformers, and primary side windings and secondary side windings of the two transformers are wound on the same iron core.
2. The three-active full-bridge DC-DC converter of claim 1, wherein: the primary side and the secondary side of the two transformers are connected in series.
3. The three-active full-bridge DC-DC converter of claim 2, wherein: when in topological operation, the 3T-shaped bridge arms on the primary side and the secondary side are always in a state of two bridge arms working and one bridge arm is disconnected, and the working modes can be divided into nine working modes according to different access transformation ratios.
4. A three-active full-bridge DC-DC converter as claimed in claim 3, characterized in that: the bridge arm of the primary side and the secondary side are different in access state under nine working modes, and the equivalent transformation ratios of the circuits are respectively N A /N B 、N C /N D 、N A /N D 、N C /N B 、(N A +N C )/N B 、(N A +N C )/N D 、N A /(N B +N D )、N C /(N B +N D )、(N A +N C )/(N B +N D )。
5. The three-active full-bridge DC-DC converter of claim 4, wherein: the topology of the converter in each mode of operation may be equivalent to DAB.
6. The three-active full-bridge DC-DC converter of claim 5, wherein: different working modes are selected, and the range of the voltage adaptation ratio near the unit adaptation ratio is widened.
7. The three-active full-bridge DC-DC converter of claim 6, wherein: by controlling the switching tube G 1 ～G 9 Not only can realize the switching between different working modes, but also can cut off the coilA return path for the induced current.
8. The three-active full-bridge DC-DC converter of claim 7, wherein: the switching problem of the operation mode is essentially a switching problem of the transformer. Because the inductance current cannot be suddenly changed, the invention selects to switch the transformer at the zero crossing point moment of the inductance current in order to ensure the stability of the system under continuous operation.
9. The three-active full-bridge DC-DC converter of claim 8, wherein: when the input voltage is detected to reach the critical switching point, the system is changed from triple phase shift control to single phase shift control.
10. The three-active full-bridge DC-DC converter of claim 9, wherein: the zero-current switching control strategy with hysteresis characteristic is adopted, so that the problem of frequent mode switching caused by voltage fluctuation at the critical switching point of the working mode can be avoided.
CN202210856440.1A 2022-07-22 2022-07-22 Topological structure of three-active full-bridge DC-DC converter Pending CN117477960A (en)

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