CN116647131B - Bidirectional isolation type DC-DC topological structure - Google Patents
Bidirectional isolation type DC-DC topological structure Download PDFInfo
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- CN116647131B CN116647131B CN202310921992.0A CN202310921992A CN116647131B CN 116647131 B CN116647131 B CN 116647131B CN 202310921992 A CN202310921992 A CN 202310921992A CN 116647131 B CN116647131 B CN 116647131B
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- 230000002457 bidirectional effect Effects 0.000 title claims abstract description 17
- 238000002955 isolation Methods 0.000 title claims abstract description 8
- 239000003990 capacitor Substances 0.000 claims description 92
- 230000008878 coupling Effects 0.000 claims description 4
- 238000010168 coupling process Methods 0.000 claims description 4
- 238000005859 coupling reaction Methods 0.000 claims description 4
- 230000001276 controlling effect Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000001360 synchronised effect Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/3353—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having at least two simultaneously operating switches on the input side, e.g. "double forward" or "double (switched) flyback" converter
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac 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
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac 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
- H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac 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 with automatic control of output voltage or current, e.g. switching regulators
- H02M3/158—Conversion of dc power input into dc power output without intermediate conversion into ac 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 with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load
- H02M3/1582—Buck-boost converters
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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
- H02M3/33573—Full-bridge at primary side of an isolation transformer
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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
- H02M3/33584—Bidirectional converters
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Circuit Arrangements For Discharge Lamps (AREA)
- Dc-Dc Converters (AREA)
Abstract
The invention discloses a bidirectional isolation type DC-DC topological structure, which comprises a three-level buck-boost circuit and a bidirectional CLLLC circuit; the bidirectional CLLLC circuit comprises a first bridge arm unit, a second bridge arm unit, a main transformer and a third bridge arm unit, wherein the primary side of the main transformer comprises a first coil and a second coil, and the secondary side comprises a third coil; one side of the first bridge arm unit is coupled with the first coil, one side of the second bridge arm unit is coupled with the second coil, and one side of the third bridge arm unit is coupled with the third coil; the high-voltage side of the three-level buck-boost circuit is coupled to the other sides of the first bridge arm unit and the second bridge arm unit. The invention has higher improvement in the aspects of wide input voltage range, large current and high gain.
Description
Technical Field
The invention relates to the technical field of electronic information, in particular to a bidirectional isolation type DC-DC topological structure.
Background
In order to optimize the power of an Electric Vehicle (EV), an on-board charger (OBC) must be efficient, lightweight and small in size. OBC needs to support appropriate grid-tie (G2V) voltage and current battery charging algorithms; thus, it acts as a power regulating interface between the grid and the EV. Furthermore, it must be able to supply power from the vehicle to the grid (V2G) so that the electric vehicle can reverse charge the grid.
For the above-mentioned needs, there are two solutions in the market, respectively CLLLC and DAB, which have advantages, but whichever is adopted, the performance requirements are higher, and the products in the market at present still need to be improved in terms of wide input voltage range, large current, high gain, and the like.
Disclosure of Invention
In view of this, the present invention aims to provide a bidirectional isolation type DC-DC topology structure with higher improvement in terms of wide input voltage range, large current and high gain.
In order to solve the technical problems, the technical scheme of the invention is as follows:
a bidirectional isolation type DC-DC topological structure comprises a three-level buck-boost circuit and a bidirectional CLLLC circuit; wherein,
the bidirectional CLLLC circuit comprises a first bridge arm unit, a second bridge arm unit, a main transformer and a third bridge arm unit, wherein the primary side of the main transformer comprises a first coil and a second coil, and the secondary side of the main transformer comprises a third coil; one side of the first bridge arm unit is coupled with the first coil, one side of the second bridge arm unit is coupled with the second coil, and one side of the third bridge arm unit is coupled with the third coil;
the high-voltage side of the three-level buck-boost circuit is respectively coupled with the other side of the first bridge arm unit and the other side of the second bridge arm unit.
Preferably, the three-level buck-boost circuit comprises a first inductor, a second inductor, a first capacitor, a second capacitor, a third capacitor, a fourth capacitor, a first switching tube, a second switching tube, a third switching tube and a fourth switching tube; wherein,
one end of the first capacitor is electrically connected with one end of the second switch tube and one end of the third capacitor, and the common point forms a first connecting point; one end of the first inductor is electrically connected with the other end of the first capacitor, and the other end of the first inductor is electrically connected with the other end of the second switch tube; one end of the first switch tube is electrically connected with the other end of the first inductor, and the other end of the first switch tube is electrically connected with the other end of the third capacitor; the common point of the first switching tube and the third capacitor and the first connecting point are respectively coupled with a first bridge arm unit;
one end of the second capacitor is electrically connected with one end of the third switch tube and one end of the fourth capacitor, and the common point forms a second connection point; one end of the second inductor is electrically connected with the other end of the second capacitor, and the other end of the second inductor is electrically connected with the other end of the third switching tube; one end of the fourth switching tube is electrically connected with the other end of the second inductor, and the other end of the fourth switching tube is electrically connected with the other end of the fourth capacitor; the common point of the fourth switching tube and the fourth capacitor and the second connection point are respectively coupled with a second bridge arm unit;
the first connecting point is electrically connected with the second connecting point, the common point of the first capacitor and the first inductor is the positive electrode, and the common point of the second capacitor and the second inductor is the negative electrode.
Preferably, the first bridge arm unit comprises a first full-current bridge arm, a third inductor and a fifth capacitor, and one side of the first full-current bridge arm is connected with the third inductor and the fifth capacitor in series and then is coupled to the first coil; the other side of the first full-current bridge arm is coupled with a common point of the first switching tube and the third capacitor and the first connecting point; the first full-flow bridge arm is composed of four switching tubes.
Preferably, the second bridge arm unit includes a second full-current bridge arm, a fourth inductor and a sixth capacitor, and one side of the second full-current bridge arm is connected in series with the fourth inductor and the sixth capacitor and then coupled to the second coil; the other side of the second full-current bridge arm is coupled with a common point of the fourth switching tube and the fourth capacitor and the second connection point; the second full-flow bridge arm is composed of four switching tubes.
Preferably, the third bridge arm unit includes a third full-current bridge arm, a fifth inductor, a seventh capacitor and an eighth capacitor, wherein one side of the third full-current bridge arm is connected with the fifth inductor and the seventh capacitor in series and then is coupled to the third coil, and the other side of the third full-current bridge arm is connected with the eighth capacitor in parallel; the second full-flow bridge arm is composed of four switching tubes.
Preferably, the control modes of the first switching tube, the second switching tube, the third switching tube and the fourth switching tube include:
in the period of t 1-t 2, the second switching tube is turned on, and the first switching tube, the third switching tube and the fourth switching tube are turned off; at this time, the second switching tube and the third switching tube are out of phase by 180 degrees;
in the period of t 2-t 3, the first switching tube, the second switching tube, the third switching tube and the fourth switching tube are all turned off;
in the period of t 3-t 4, the third switching tube is turned on, and the first switching tube, the second switching tube and the fourth switching tube are turned off;
in the period of t 4-t 5, the first switching tube, the second switching tube, the third switching tube and the fourth switching tube are all turned off;
and circularly controlling according to the four time periods.
Preferably, the three-level buck-boost circuit further comprises a change-over switch unit, wherein the change-over switch unit is coupled between the first bridge arm unit, the second bridge arm unit and the three-level buck-boost circuit, and the change-over switch unit is used for controlling the on-off of the coupling relation among the first bridge arm unit, the second bridge arm unit and the three-level buck-boost circuit.
Preferably, the switching unit includes:
the first analog switch is electrically connected between the first capacitor and the second capacitor;
the second analog switch is electrically connected between the third capacitor and the first full-current bridge arm and is provided with two paths of controllable paths;
and the third analog switch is electrically connected between the fourth capacitor and the second full-current bridge arm and is provided with two paths of controllable paths.
The technical effects of the invention are mainly as follows:
the three-level buck-boost circuit is combined with the CLLLC circuit to form a novel DC-DC topological structure, and the three-level buck-boost circuit has high improvement in the aspects of wide input voltage range, large current, high gain and the like.
Drawings
FIG. 1 is a circuit diagram of a bi-directional isolated DC-DC topology in accordance with a first embodiment;
fig. 2-5 are diagrams showing power flow direction indication for the first to fourth switching transistors at each time period in the first embodiment;
fig. 6 is a circuit diagram of a bidirectional isolated DC-DC topology in a second embodiment.
Reference numerals: 10. a three-level buck-boost circuit; 20. a first bridge arm unit; 30. a second bridge arm unit; 40. and a third bridge arm unit.
Detailed Description
The following detailed description of the invention is provided in connection with the accompanying drawings to facilitate understanding and grasping of the technical scheme of the invention.
The present embodiment provides a bidirectional isolation type DC-DC topology structure, which includes a three-level buck-boost circuit 10 and a bidirectional CLLLC circuit, and is characterized in that the two circuits are organically integrated. The circuit configuration will be described in detail below.
Referring to fig. 1, the three-level buck-boost circuit 10 includes an upper circuit portion and a lower circuit portion, wherein the first circuit portion is composed of a first inductor L1, a first capacitor C1, a third capacitor C3, a first switching tube Q1 and a second switching tube Q2, wherein one end of the first capacitor C1 is electrically connected with one end of the second switching tube Q2 and one end of the third capacitor C3, and a common point forms a first connection point; one end of the first inductor L1 is electrically connected with the other end of the first capacitor C1, and the other end of the first inductor L1 is electrically connected with the other end of the second switching tube Q2; one end of the first switching tube Q1 is electrically connected to the other end of the first inductor L1, and the other end of the first switching tube Q1 is electrically connected to the other end of the third capacitor C3.
The second circuit part is composed of a second inductor L2, a second capacitor C2, a fourth capacitor C4, a third switching tube Q3 and a fourth switching tube Q4, wherein one end of the second capacitor C2 is electrically connected with one end of the third switching tube Q3 and one end of the fourth capacitor C4, and a common point forms a second connection point; one end of the second inductor L2 is electrically connected with the other end of the second capacitor C2, and the other end of the second inductor L2 is electrically connected with the other end of the third switching tube Q3; one end of the fourth switching tube Q4 is electrically connected to the other end of the second inductor L2, and the other end of the fourth switching tube Q4 is electrically connected to the other end of the fourth capacitor C4.
The first connection point and the second connection point are electrically connected, the common point of the first capacitor C1 and the first inductor L1 is the positive electrode, and the common point of the second capacitor C2 and the second inductor L2 is the negative electrode.
Referring to fig. 2, the bidirectional CLLLC circuit in this embodiment is different from the conventional structure in that it mainly includes a first leg unit 20, a second leg unit 30, a main transformer and a third leg unit 40, wherein the primary side of the main transformer includes a first coil and a second coil, and the secondary side of the main transformer includes a third coil; one side of the first arm unit 20 is coupled to the first coil, one side of the second arm unit 30 is coupled to the second coil, and one side of the third arm unit 40 is coupled to the third coil.
Specifically, the first bridge arm unit 20 includes a first full-current bridge arm, a third inductor Lr1, and a fifth capacitor Cr1, where one side of the first full-current bridge arm is coupled to the first coil after being connected in series with the third inductor Lr1 and the fifth capacitor Cr 1; the other side of the first full-current bridge arm is respectively coupled with a common point and a first connecting point of the first switching tube Q1 and the third capacitor C3; the first full-flow bridge arm is composed of four switching tubes M1-M4. Meanwhile, a common point and a first connection point of the first switching tube Q1 and the third capacitor C3 are coupled with the first bridge arm unit 20.
The second bridge arm unit 30 includes a second full-current bridge arm, a fourth inductor Lr2, and a sixth capacitor Cr2, where one side of the second full-current bridge arm is connected in series with the fourth inductor Lr2 and the sixth capacitor Cr2 and then coupled to the second coil; the other side of the second full-current bridge arm is respectively coupled with a common point and a second connection point of the fourth switch tube Q4 and the fourth capacitor C4; the second full-flow bridge arm is composed of four switching tubes M5-M8. Meanwhile, a common point and a second connection point of the fourth switching tube Q4 and the fourth capacitor C4 are respectively coupled with the second bridge arm unit 30.
With the above arrangement, the high-voltage side of the three-level buck-boost circuit 10 is coupled to the other side of the first arm unit 20 and the second arm unit 30.
The third bridge arm unit 40 includes a third full-current bridge arm, a fifth inductor Lr3, a seventh capacitor Cr3, and an eighth capacitor C5, where one side of the third full-current bridge arm is connected in series with the fifth inductor Lr3 and the seventh capacitor Cr3 and then coupled to the third coil, and the other side of the third full-current bridge arm is connected in parallel with the eighth capacitor C5; the third full-flow bridge arm is composed of four switching tubes M9-M12.
The working principle of the above CLLLC part is: the driving time sequences of the first bridge arm unit 20 and the second bridge arm unit 30 are completely consistent, so that series synchronous operation is realized; when energy is transmitted from left to right, the upper tube and the lower tube of the first bridge arm unit 20 and the second bridge arm unit 30 are alternately conducted at 50% duty ratio, the primary side resonant cavity generates resonance, the energy is transmitted from the left side to the right side through the main transformer, and the third bridge arm realizes synchronous rectification compared with the first bridge arm and the second bridge arm. When energy is transmitted from right to left, the upper tube and the lower tube of the third bridge arm unit 40 are alternately conducted at 50% duty ratio, the secondary side (third coil) resonant cavity generates resonance, the energy is transmitted from the right side to the left side through the main transformer, and the first bridge arm unit 20 and the second bridge arm unit 30 realize synchronous rectification compared with the third bridge arm.
The following describes how to control the first switching tube Q1, the second switching tube Q2, the third switching tube Q3 and the fourth switching tube Q4, and the specific control manner includes:
in the period of t 1-t 2, the second switching tube Q2 is turned on, and the first switching tube Q1, the third switching tube Q3 and the fourth switching tube Q4 are turned off; at this time, the second switching tube Q2 and the third switching tube Q3 are 180 degrees out of phase;
in the period of t 2-t 3, the first switching tube Q1, the second switching tube Q2, the third switching tube Q3 and the fourth switching tube Q4 are all turned off;
in the period of t 3-t 4, the third switching tube Q3 is turned on, and the first switching tube Q1, the second switching tube Q2 and the fourth switching tube Q4 are turned off;
in the period of t 4-t 5, the first switching tube Q1, the second switching tube Q2, the third switching tube Q3 and the fourth switching tube Q4 are all turned off;
and circularly controlling according to the four time periods.
Embodiment II,
Referring to fig. 6, on the basis of the first embodiment, a switch unit is further added in this embodiment, where the switch unit is coupled between the first bridge arm unit 20, the second bridge arm unit 30, and the three-level buck-boost circuit 10, and the switch unit is used to control on-off of the coupling relationship between the first bridge arm unit 20, the second bridge arm unit 30, and the three-level buck-boost circuit 10. Specifically, the switch unit includes a first analog switch K1, a second analog switch K2, and a third analog switch K3, where the first analog switch K1 is a single path and is electrically connected between the first capacitor and the second capacitor; the second analog switch K2 is a double-path, wherein one path is electrically connected between the third capacitor and the first full-current bridge arm (specifically, the switch tube M1), and the other path is electrically connected between the first capacitor and the third capacitor; the third analog switch K3 is electrically connected between the fourth capacitor and the second full-current bridge arm (specifically, the switching tube M6), and the third analog switch K3 has two controllable paths.
It should be noted that the first analog switch K1, the second analog switch K2, and the third analog switch K3 may be integrated to adopt the same multi-path analog switch, so as to facilitate centralized control.
Through the above technical solution, the first analog switch K1, the second analog switch K2 and the third analog switch K3 may be controlled to switch according to actual needs, for example, when the coupling relationship between the first bridge arm unit 20, the second bridge arm unit 30 and the three-level buck-boost circuit 10 is to be released, the first analog switch K1 is controlled to be opened, the second analog switch K2 is s1 closed, the s2 is opened, the third analog switch K3 is s2 closed, and s1 is opened, and at this time, the left side of the whole circuit is provided with two paths of output or input by the first bridge arm unit 20 and the second bridge arm unit 30 respectively.
Of course, the above is only a typical example of the invention, and other embodiments of the invention are also possible, and all technical solutions formed by equivalent substitution or equivalent transformation fall within the scope of the invention claimed.
Claims (1)
1. The bidirectional isolation type DC-DC topological structure is characterized by comprising a three-level buck-boost circuit (10) and a bidirectional CLLLC circuit; wherein,
the bidirectional CLLLC circuit comprises a first bridge arm unit (20), a second bridge arm unit (30), a main transformer and a third bridge arm unit (40), wherein the primary side of the main transformer comprises a first coil and a second coil, and the secondary side of the main transformer comprises a third coil; one side of the first bridge arm unit (20) is coupled to the first coil, one side of the second bridge arm unit (30) is coupled to the second coil, and one side of the third bridge arm unit (40) is coupled to the third coil;
the high-voltage side of the three-level buck-boost circuit (10) is respectively coupled with the other side of the first bridge arm unit (20) and the other side of the second bridge arm unit (30); the three-level buck-boost circuit (10) comprises a first inductor, a second inductor, a first capacitor, a second capacitor, a third capacitor, a fourth capacitor, a first switching tube, a second switching tube, a third switching tube and a fourth switching tube; wherein,
one end of the first capacitor is electrically connected with one end of the second switch tube and one end of the third capacitor, and the common point forms a first connecting point; one end of the first inductor is electrically connected with the other end of the first capacitor, and the other end of the first inductor is electrically connected with the other end of the second switch tube; one end of the first switch tube is electrically connected with the other end of the first inductor, and the other end of the first switch tube is electrically connected with the other end of the third capacitor; the common point of the first switching tube and the third capacitor and the first connection point are respectively coupled with a first bridge arm unit (20);
one end of the second capacitor is electrically connected with one end of the third switch tube and one end of the fourth capacitor, and the common point forms a second connection point; one end of the second inductor is electrically connected with the other end of the second capacitor, and the other end of the second inductor is electrically connected with the other end of the third switching tube; one end of the fourth switching tube is electrically connected with the other end of the second inductor, and the other end of the fourth switching tube is electrically connected with the other end of the fourth capacitor; the common point of the fourth switching tube and the fourth capacitor and the second connection point are respectively coupled with a second bridge arm unit (30);
the first connecting point is electrically connected with the second connecting point, the common point of the first capacitor and the first inductor is an anode, and the common point of the second capacitor and the second inductor is a cathode; the first bridge arm unit (20) comprises a first full-current bridge arm, a third inductor and a fifth capacitor, wherein one side of the first full-current bridge arm is connected with the third inductor and the fifth capacitor in series and then is coupled to the first coil; the other side of the first full-current bridge arm is respectively coupled with a common point of the first switching tube and the third capacitor and the first connecting point; the first full-flow bridge arm consists of four switching tubes; the second bridge arm unit (30) comprises a second full-current bridge arm, a fourth inductor and a sixth capacitor, wherein one side of the second full-current bridge arm is connected with the fourth inductor and the sixth capacitor in series and then is coupled to the second coil; the other side of the second full-current bridge arm is respectively coupled with a common point of the fourth switching tube and the fourth capacitor and the second connection point; the second full-flow bridge arm consists of four switching tubes; the third bridge arm unit (40) comprises a third full-current bridge arm, a fifth inductor, a seventh capacitor and an eighth capacitor, one side of the third full-current bridge arm is connected with the fifth inductor and the seventh capacitor in series and then is coupled to a third coil, and the other side of the third full-current bridge arm is connected with the eighth capacitor in parallel; the third full-flow bridge arm consists of four switching tubes;
the switching unit is coupled between the first bridge arm unit (20), the second bridge arm unit (30) and the three-level buck-boost circuit (10), and is used for controlling the on-off of the coupling relation between the first bridge arm unit (20), the second bridge arm unit (30) and the three-level buck-boost circuit (10); the change-over switch unit includes:
the first analog switch is electrically connected between the first capacitor and the second capacitor;
the second analog switch is electrically connected between the third capacitor and the first full-current bridge arm and is provided with two paths of controllable paths;
the third analog switch is electrically connected between the fourth capacitor and the second full-current bridge arm and is provided with two paths of controllable paths; the control modes of the first switching tube, the second switching tube, the third switching tube and the fourth switching tube comprise:
in the period of t 1-t 2, the second switching tube is turned on, and the first switching tube, the third switching tube and the fourth switching tube are turned off; at this time, the second switching tube and the third switching tube are out of phase by 180 degrees;
in the period of t 2-t 3, the first switching tube, the second switching tube, the third switching tube and the fourth switching tube are all turned off;
in the period of t 3-t 4, the third switching tube is turned on, and the first switching tube, the second switching tube and the fourth switching tube are turned off;
in the period of t 4-t 5, the first switching tube, the second switching tube, the third switching tube and the fourth switching tube are all turned off;
and circularly controlling according to the four time periods.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310921992.0A CN116647131B (en) | 2023-07-26 | 2023-07-26 | Bidirectional isolation type DC-DC topological structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310921992.0A CN116647131B (en) | 2023-07-26 | 2023-07-26 | Bidirectional isolation type DC-DC topological structure |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN116647131A CN116647131A (en) | 2023-08-25 |
| CN116647131B true CN116647131B (en) | 2024-01-30 |
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| CN202310921992.0A Active CN116647131B (en) | 2023-07-26 | 2023-07-26 | Bidirectional isolation type DC-DC topological structure |
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| CN113285610A (en) * | 2021-06-06 | 2021-08-20 | 广州菲利斯太阳能科技有限公司 | Circuit topology, control method and electronic equipment with topology |
| CN115133777A (en) * | 2022-07-22 | 2022-09-30 | 北京雷动智创科技有限公司 | Isolated DC converter and control method |
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| CN116647131A (en) | 2023-08-25 |
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