A dual active bridge integrated current doubler rectifier three-port topology structure and control method thereof

Abstract

The present invention discloses a dual active bridge integrated current doubler rectifier three-port topology structure and a control method thereof, belonging to the technical field of power electronic converters in vehicle-mounted integrated power supply systems. The control method is based on a dual active bridge integrated current doubler rectifier three-port DC circuit, wherein the power transfer between ports A and C is controlled by lagging the inner phase shift angle of the fourth switch tube Q4 behind the first switch tube Q1, the power transfer between ports A and B is controlled by lagging the outer phase shift angle of the fourth switch tube Q4 by the fifth switch tube Q5 and the eighth switch tube Q8, the ninth switch tube Q9 lags the second switch tube Q2 by a resonance delay, and the tenth switch tube Q 10 The first switch tube Q1 is delayed by a resonance delay. The ten switch tubes in the present invention can all be turned on at zero voltage, and continuous energy transfer between the three ports is achieved through the phase shift angle. The control is simple and easy to implement, effectively avoiding the problems of large volume, large loss and discontinuous control caused by the circuit breaker in some solutions.

Description

Technical Field

[0001] The invention relates to the field of power electronic converters in vehicle-mounted integrated power supply systems, in particular to a dual active bridge integrated current doubler rectification three-port topology structure and a control method thereof. Background Art

[0002] At present, many core technologies related to electric vehicles are developing rapidly, including the key components of electric vehicles - on-board battery charger (OBC) and low-voltage DC-DC converter (LDC). A typical OBC uses the AC grid as input to charge a high-voltage battery with a wide voltage range, and uses an isolation topology to achieve electrical isolation between the grid and the battery. A typical LDC uses a high-voltage battery as input to provide power to the electrical equipment and low-voltage battery in the vehicle, and uses an isolation transformer to achieve electrical isolation. Considering the direct impact of OBC and LDC on battery life and battery charging and discharging performance, OBC and LDC must ensure sufficiently high efficiency while ensuring reliability. In addition, the size and weight of OBC and LDC must also be controlled so as not to affect the needs of other automotive components too much.

[0003] With the rapid development of core technologies of electric vehicles, people have put forward higher and higher technical requirements for OBC: it should have the function of two-way power transmission, so that more intelligent functions can be integrated into the power grid through electric vehicles (V2G), such as peak switching, frequency regulation, etc., or car users can use two-way OBC to use the electric energy stored in the battery of electric vehicles for other purposes, such as powering daily family life during power outages (V2H), or connect the OBC front stage with the fuel cell to achieve multi-energy complementary power supply. Fuel cells have high energy density, diversified fuel sources and fast fuel replenishment speed, which can improve the endurance of electric vehicles.

[0004] Obviously, after new technical requirements are put forward, maintaining the original requirements of high reliability, high efficiency, high power density and light weight will face some technical and cost issues. Therefore, it is necessary to achieve high efficiency, high power density and light weight through integration to adapt to the development of electric vehicles.

[0005] In recent years, the three-port topology integrating OBC and LDC has been widely used. Considering the basic characteristics of OBC high voltage and high power and LDC low voltage and high current, the typical topologies include three full-bridge circuits, three half-bridge circuits, dual active bridge integrated full-wave rectification plus Buck circuits, and dual half-bridge integrated Buck / Boost half-bridge circuits. Phase shift control, frequency conversion control, PWM control, etc. are often used in the above circuits, and some solutions will also use relay control mode switching. In terms of topology selection, although the full-bridge topology is suitable for high-power occasions, the LDC mode in the OBC-LDC integrated circuit belongs to the low-voltage and high-current situation, and the power is not large. Therefore, the use of the three full-bridge topology not only has no advantage, but will increase the cost. The half-bridge topology uses fewer switches, which helps to improve power density. However, compared with the full-bridge topology, the primary and secondary currents of the half-bridge topology are twice that of the full-bridge topology at the same power. Therefore, the current stress of the switch tube, resonant element and transformer winding is about twice that of the full-bridge topology. Under the current development goal of higher power levels, its device selection is difficult. Therefore, the three-half-bridge circuit and the dual-half-bridge integrated related topology are not suitable for the application of OBC-LDC integrated circuit OBC mode.

[0006] Therefore, it is necessary to develop a more suitable integrated topology to solve the problems existing in the prior art. Summary of the invention

[0007] The technical problem to be solved by the present invention is to provide a dual active bridge integrated current doubler rectifier three-port topology structure and a control method thereof, which not only enables the topology structure to have greater advantages than the existing scheme, but also avoids the problems of large volume, low efficiency and discontinuous control caused by the use of relays for mode switching in some schemes, and can realize soft switching of all switch tubes at the same time.

[0008] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0009] A dual active bridge integrated current doubler rectifier three-port topology structure, wherein the circuit is composed of an A-port circuit, a B-port circuit, a C-port circuit and a transformer, wherein the A-port circuit is composed of a DC busbar such as a fuel cell, a first capacitor C1, a first switch tube Q1, a second switch tube Q2, a third switch tube Q3 and a fourth switch tube Q4; the B-port circuit is composed of a first inductor L1, a fifth switch tube Q5, a sixth switch tube Q6, a seventh switch tube Q7, an eighth switch tube Q8, a second capacitor C2 and a high-voltage battery; the C-port circuit is composed of a ninth switch tube Q9, a tenth switch tube Q 10 , a second inductor L2, a third inductor L3, a third capacitor C3 and a low-voltage battery; the A port circuit, the B port circuit and the C port circuit are respectively connected through the first winding N1, the second winding N2 and the third winding N3 of the transformer.

[0010] A further improvement of the technical solution of the present invention is that: the positive electrode of the DC bus of the fuel cell or the like is respectively connected to one end of the first capacitor C1, the drain of the third switch tube Q3 and the drain of the first switch tube Q1; the negative electrode of the DC bus of the fuel cell or the like is respectively connected to the other end of the first capacitor C1, the source of the fourth switch tube Q4 and the source of the second switch tube Q2; one end of the first winding N1 of the transformer is connected to the source of the first switch tube Q1 and the drain of the second switch tube Q2; the other end of the first winding N1 of the transformer is connected to the source of the third switch tube Q3 and the drain of the fourth switch tube Q4.

[0011] A further improvement of the technical solution of the present invention lies in that: the positive electrode of the high-voltage battery is respectively connected to one end of the second capacitor C2, the drain of the seventh switch tube Q7 and the drain of the fifth switch tube Q5; the negative electrode of the high-voltage battery is respectively connected to the other end of the second capacitor C2, the source of the eighth switch tube Q8 and the source of the sixth switch tube Q6; one end of the second winding N2 of the transformer is connected to one end of the first inductor L1, and the other end of the first inductor L1 is connected to the source of the fifth switch tube Q5 and the drain of the sixth switch tube Q6; the other end of the second winding N2 of the transformer is connected to the source of the seventh switch tube Q7 and the drain of the eighth switch tube Q8.

[0012] A further improvement of the technical solution of the present invention is that: the positive electrode of the low-voltage battery is respectively connected to one end of the third capacitor C3, one end of the second inductor L2 and one end of the third inductor L3; the negative electrode of the low-voltage battery is respectively connected to the other end of the third capacitor C3, the source of the ninth switch tube Q9 and the source of the tenth switch tube Q 10 The drain of the transformer is connected; one end of the third winding N3 of the transformer is connected to the drain of the ninth switch tube Q9 and the other end of the second inductor L2 respectively; the other end of the third winding N3 of the transformer is connected to the drain of the tenth switch tube Q 10 The source of is connected to the other end of the third inductor L3.

[0013] A control method for a dual active bridge integrated current doubler rectifier three-port topology structure, wherein the power transfer between the A port circuit and the C port circuit is controlled by lagging the inner phase shift angle of the fourth switch tube Q4 behind the first switch tube Q1; the power transfer between the A port circuit and the B port circuit is controlled by lagging the outer phase shift angle of the fifth switch tube Q5 and the eighth switch tube Q8 behind the fourth switch tube Q4; the ninth switch tube Q9 lags the second switch tube Q2 by a resonance delay, and the tenth switch tube Q 10 The first switch tube Q1 is delayed by a resonance delay.

[0014] A further improvement of the technical solution of the present invention is that: the conduction time of the first switch tube Q1 and the second switch tube Q2 is half a cycle and the two are complementarily conducted; the conduction time of the third switch tube Q3 and the fourth switch tube Q4 is half a cycle and the two are complementarily conducted; the conduction time of the fifth switch tube Q5 and the sixth switch tube Q6 is half a cycle and the two are complementarily conducted; the conduction time of the seventh switch tube Q7 and the eighth switch tube Q8 is half a cycle and the two are complementarily conducted; the fourth switch tube Q4 lags behind the first switch tube Q1 by an inner phase shift angle; the fifth switch tube Q5 and the eighth switch tube Q8 lag behind the fourth switch tube Q4 by an outer phase shift angle; the ninth switch tube Q9 and the tenth switch tube Q1 10 The conduction time is half a cycle plus an internal phase shift angle.

[0015] Due to the adoption of the above technical solution, the technical progress achieved by the present invention is:

[0016] 1. The dual active bridge integrated current doubler rectifier three-port topology structure of the present invention has the advantages of simple structure, reduced output current ripple and low cost. It is combined with the existing two-port current doubler rectifier topology to realize power transfer by phase-shifted full-bridge control. In the dual active bridge integrated current doubler rectifier circuit, the external phase shift angle and the internal phase shift angle are respectively used to control the power transfer of the B-port circuit and the C-port circuit. Compared with the partial scheme of using relay control mode switching, it not only reduces the system volume, but also improves the overall system efficiency, and can also realize the mutual switching between OBC and LDC working modes through continuous control.

[0017] 2. The dual active bridge integrated current doubler rectifier three-port topology structure of the present invention realizes port integration and device reuse through a multi-winding transformer, thereby reducing the number of devices and the volume of the converter and lowering the overall cost.

[0018] 3. The control method of the dual active bridge integrated current doubler rectifier three-port topology structure of the present invention can realize bidirectional and continuous energy transfer between the three ports through the phase shift angle. The control is simple and easy to implement, can be quickly switched between different working modes, and has a wide range of applications.

[0019] 4. The converter scheme of the dual active bridge integrated current doubler rectifier three-port topology structure of the present invention is centrally controlled, effectively avoiding the problems of large volume, large loss and discontinuous control caused by the use of circuit breakers in some schemes.

[0020] 5. The dual active bridge integrated current doubler rectifier three-port topology structure of the present invention can realize zero voltage switching of ten switch tubes, effectively reducing switching losses and further improving system efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 Schematic diagram of a circuit of a dual active bridge integrated current doubler rectifier three-port topology structure in an embodiment of the present invention;

[0022] Figure 2 Schematic diagram of waveforms of a control method for a dual active bridge integrated current doubler rectifier three-port converter in an embodiment of the present invention;

[0023] Figure 3 Schematic diagram of the control sequence of the dual active bridge integrated current doubler rectifier three-port converter control method in an embodiment of the present invention;

[0024] Figures 4 to 7 Schematic diagram of equivalent circuits of different modes of a dual active bridge integrated current doubler rectifier three-port converter control method in an embodiment of the present invention;

[0025] Among them, V A is the fuel cell voltage of the A port circuit, V B is the high voltage battery voltage, V C is the low voltage battery voltage, N a is the number of turns of the first winding of the transformer, N b is the number of turns of the second winding of the transformer, N c is the number of turns of the third winding of the transformer, N ab is the ratio of the number of turns of the first winding to the number of turns of the second winding of the transformer, N ca is the ratio of the number of turns of the third winding of the transformer to the number of turns of the first winding, v 1 is the voltage between the midpoints of the two bridge arms on the circuit side of port A, v 2 is the voltage between the midpoints of the two bridge arms on the circuit side of port B, v 2 ’ is the voltage between the midpoints of the two bridge arms on the B-port circuit side converted to the voltage on the A-port circuit side, v L is the phase-shifted inductor voltage on the B-port circuit side, v L ’ is the voltage converted from the phase-shifted inductor voltage on the B-port circuit side to the voltage on the A-port circuit side, u gs is the driving voltage of the switch tube, i 1 is the current of the first winding of the transformer on the circuit side of port A, i L1 is the first inductor current on the B port circuit side, i L2 is the second inductor current on the C port circuit side, i L3 is the third inductor current on the C port circuit side, D 1 is the phase shift angle in the bridge on the A port circuit side, D is the outward phase angle, T hsis half a switching cycle, Q1 is the first switch tube, Q2 is the second switch tube, Q3 is the third switch tube, Q4 is the fourth switch tube, Q5 is the fifth switch tube, Q6 is the sixth switch tube, Q7 is the seventh switch tube, Q8 is the eighth switch tube, Q9 is the ninth switch tube, Q 10 It is the tenth switching tube. DETAILED DESCRIPTION

[0026] In order to overcome the problems existing in the prior art during the implementation of the embodiment of the present invention, a dual active bridge integrated full-wave rectifier plus Buck circuit solution is preliminarily screened out. Taking into account the correlation and difference between full-wave rectification and current doubler rectification circuits, the advantages and disadvantages of current doubler rectification and full-wave rectification in the integrated port are analyzed. Compared with the full-wave rectification circuit, the current doubler rectification circuit has only one winding on the secondary side and does not require a center tap. The transformer structure is simple, and the effective value of the current flowing through the secondary side of the transformer is relatively small, which is half of that of the center tap structure. Therefore, copper loss can be reduced, and the transient performance of the converter is greatly improved. Although current doubler rectification requires two inductors, the currents of the two inductors are superimposed on each other, so that the output current ripple is reduced. If combined with magnetic integration technology, the problem of the large size of the two inductors can also be reduced. In addition, the full-wave rectifier needs to add a post-stage Buck circuit to adjust the output power of the port, which requires more switching tubes and increases the cost. In summary, the dual active bridge integrated current doubler rectifier circuit is a more suitable integrated topology, which has the advantages of simple structure, reduced output current ripple and low cost. Combined with the existing two-port current doubler rectifier topology to achieve power transfer method with phase-shifted full-bridge control, the external phase shift angle and the internal phase shift angle are used to control the power transfer of port B and port C in the dual active bridge integrated current doubler rectifier circuit respectively. Compared with some schemes that use relay control mode switching, it not only reduces the system volume, but also improves the overall system efficiency, and can also realize the mutual switching between OBC and LDC working modes through continuous control.

[0027] The present invention is further described in detail below with reference to the accompanying drawings and embodiments:

[0028] like Figure 1 As shown, a dual active bridge integrated current doubler rectifier three-port topology structure, the circuit of which is composed of an A port circuit, a B port circuit, a C port circuit and a transformer, the A port circuit is composed of a DC bus such as a fuel cell, a first capacitor C1, a first switch tube Q1, a second switch tube Q2, a third switch tube Q3 and a fourth switch tube Q4; the B port circuit is composed of a first inductor L1, a fifth switch tube Q5, a sixth switch tube Q6, a seventh switch tube Q7, an eighth switch tube Q8, a second capacitor C2 and a high-voltage battery; the C port circuit is composed of a ninth switch tube Q9, a tenth switch tube Q 10, a second inductor L2, a third inductor L3, a third capacitor C3 and a low-voltage battery; the A port circuit, the B port circuit and the C port circuit are connected through the first winding N1, the second winding N2 and the third winding N3 of the transformer.

[0029] The positive electrode of the DC busbar of the fuel cell or the like is respectively connected to one end of the first capacitor C1, the drain of the third switch tube Q3 and the drain of the first switch tube Q1, and the negative electrode of the DC busbar of the fuel cell or the like is respectively connected to the other end of the first capacitor C1, the source of the fourth switch tube Q4 and the source of the second switch tube Q2, one end of the first winding N1 of the transformer is connected to the source of the first switch tube Q1 and the drain of the second switch tube Q2, and the other end of the first winding N1 of the transformer is connected to the source of the third switch tube Q3 and the drain of the fourth switch tube Q4.

[0030] The positive electrode of the high-voltage battery is respectively connected to one end of the second capacitor C2, the drain of the seventh switch tube Q7 and the drain of the fifth switch tube Q5, and the negative electrode of the high-voltage battery is respectively connected to the other end of the second capacitor C2, the source of the eighth switch tube Q8 and the source of the sixth switch tube Q6, one end of the second winding N2 of the transformer is connected to one end of the first inductor L1, the other end of the first inductor L1 is connected to the source of the fifth switch tube Q5 and the drain of the sixth switch tube Q6, and the other end of the second winding N2 of the transformer is connected to the source of the seventh switch tube Q7 and the drain of the eighth switch tube Q8.

[0031] The positive electrode of the low-voltage battery is respectively connected to one end of the third capacitor C3, one end of the second inductor L2 and one end of the third inductor L3, and the negative electrode of the low-voltage battery is respectively connected to the other end of the third capacitor C3, the source of the ninth switch tube Q9 and the source of the tenth switch tube Q 10 The drain of the transformer is connected, one end of the third winding N3 of the transformer is connected to the drain of the ninth switch tube Q9 and the other end of the second inductor L2 respectively, and the other end of the third winding N3 of the transformer is connected to the drain of the tenth switch tube Q 10 The source of is connected to the other end of the third inductor L3.

[0032] like Figure 2 and Figure 3As shown, a control method for a dual active bridge integrated current doubler rectifier three-port topology structure is provided, wherein the power transfer between the A port circuit and the C port circuit is controlled by the inner phase shift angle of the fourth switch tube Q4 lagging behind the first switch tube Q1; the power transfer between the A port circuit and the B port circuit is controlled by the outer phase shift angle of the fifth switch tube Q5 and the eighth switch tube Q8 lagging behind the fourth switch tube Q4; the ninth switch tube Q9 lags behind the second switch tube Q2 by a resonance delay, and the tenth switch tube Q 10 The first switch tube Q1 is delayed by a resonance delay.

[0033] The first switch tube Q1 and the second switch tube Q2 are both turned on for half a cycle and are complementarily turned on. The third switch tube Q3 and the fourth switch tube Q4 are both turned on for half a cycle and are complementarily turned on. The fifth switch tube Q5 and the sixth switch tube Q6 are both turned on for half a cycle and are complementarily turned on. The seventh switch tube Q7 and the eighth switch tube Q8 are both turned on for half a cycle and are complementarily turned on. The fourth switch tube Q4 lags behind the first switch tube Q1 by an inner phase shift angle. The fifth switch tube Q5 and the eighth switch tube Q8 both lag behind the fourth switch tube Q4 by an outer phase shift angle. The ninth switch tube Q9 and the tenth switch tube Q1 10 The conduction time of the ninth switch tube Q9 is half a cycle plus an inner phase shift angle, the ninth switch tube Q9 lags behind the second switch tube Q2 by a resonance delay, and the tenth switch tube Q 10 The first switch tube Q1 is delayed by a resonance delay. Ten switch tubes are controlled according to the cycle and switch sequence of the above control method, and the ten switch tubes can all be turned on at zero voltage.

[0034] When the inductor current is negative and the second switch tube Q2 is turned off, the first inductor L1 resonates with the parasitic capacitance of the first switch tube Q1 and the parasitic capacitance of the second switch tube Q2 during the dead time, and the body diode of the first switch tube Q1 is turned on for freewheeling, creating conditions for its zero voltage turn-on; when the inductor current is negative, during the inner phase shift angle between the first switch tube Q1 and the fourth switch tube Q4, the tenth switch tube Q 10 After the resonant delay of the second inductor L2, the third inductor L3 and its parasitic capacitance, its body diode is turned on, and the tenth switch tube Q 10The zero voltage switching is created; when the inductor current is negative and the third switch tube Q3 is turned off, the first inductor L1 resonates with the parasitic capacitance of the third switch tube Q3 and the fourth switch tube Q4 during the dead time, and the body diode of the fourth switch tube Q4 is turned on by freewheeling, which creates the condition for its zero voltage switching; after the inductor current changes from negative to positive, the sixth switch tube Q6 and the seventh switch tube Q7 are turned off, and the first inductor L1 resonates with the parasitic capacitance of the fifth switch tube Q5, the sixth switch tube Q6, the seventh switch tube Q7, and the eighth switch tube Q8 during the dead time, and the body diodes of the fifth switch tube Q5 and the eighth switch tube Q8 are turned on by freewheeling, which creates the condition for its zero voltage switching; when the inductor current is positive and the first switch tube Q1 is turned off, the first inductor L1 resonates with the parasitic capacitance of the first switch tube Q1 and the second switch tube Q2 during the dead time, and the body diode of the second switch tube Q2 is turned on by freewheeling, which creates the condition for its zero voltage switching; When the inductive current is in the positive direction, during the inner phase shift angle of the first switch tube Q1 and the fourth switch tube Q4, the body diode of the ninth switch tube Q9 is turned on after the resonance delay of the second inductor L2, the third inductor L3 and the parasitic capacitance thereof, thereby creating a condition for the zero voltage turn-on of the ninth switch tube Q9; when the inductive current is in the positive direction and the fourth switch tube Q4 is turned off, the first inductor L1 resonates with the parasitic capacitance of the third switch tube Q3 and the fourth switch tube Q4 during the dead time, and the body diode of the third switch tube Q3 is turned on, thereby creating a condition for its zero voltage turn-on; after the inductive current changes from the positive direction to the negative direction, the fifth switch tube Q5 and the eighth switch tube Q8 are turned off, and during the dead time, the first inductor L1 resonates with the parasitic capacitance of the fifth switch tube Q5, the sixth switch tube Q6, the seventh switch tube Q7 and the eighth switch tube Q8, and the body diodes of the sixth switch tube Q6 and the seventh switch tube Q7 are turned on, thereby creating a condition for their zero voltage turn-on.

[0035] This control method is symmetrical in the positive and negative half cycles, so combined with Figures 4 to 7 Let's explain the four switching modes of the positive half cycle in detail:

[0036] like Figure 4 The figure shows the switching mode from t0 to t1. At t0, the second switch tube Q2 is turned off. After the dead time, the first switch tube Q1 is turned on with zero voltage. At this time, the first switch tube Q1, the third switch tube Q3, the sixth switch tube Q6, the seventh switch tube Q7 and the ninth switch tube Q9 are all turned on. This period is the period of the tenth switch tube Q 10 The resonance delay before opening, at this time, the voltage across the first winding of the transformer is zero, the second inductor and the third inductor are respectively connected through the ninth switch tube Q9 and the tenth switch tube Q 10 Assuming that the currents of the two inductors remain basically unchanged, the current of the first winding of the transformer is i1(t1)=i1(t0)+N ab V B (t-t0) / L1, the second inductor current is i L2(t1)=i L2 (t0)-V C (t-t0) / L2, the third inductor current is i L3 (t1)=i L3 (t0)-V C (t-t0) / L3.

[0037] like Figure 5 The t1-t2 switching mode is shown. t At time 1, the tenth switch tube Q 10 Driving voltage, the tenth switch tube Q 10 Zero voltage is turned on, and the switch states of other switches remain unchanged. At this time, the current of the first winding of the transformer is i1(t2)=i1(t1)+N ab V B (t-t1) / L1, the second inductor current is i L2 (t2)=i L2 (t1)-V C (t-t1) / L2, the third inductor current is i L3 (t2)=i L3 (t1)-V C (t-t1) / L3.

[0038] like Figure 6 The t2-t3 switching mode is shown. t At time 2, the third switch tube Q3 is turned off. After the dead time, the fourth switch tube Q4 is turned on with zero voltage, the ninth switch tube Q9 is turned off, and the switch states of other switch tubes remain unchanged. At this time, the current of the first winding of the transformer is i1(t3)=i1(t2)+(V A +N ab V B )(t-t2) / L1, the second inductor current is i L2 (t3)=i L2 (t2)+(N ca V A -V C )(t-t2) / L2, the third inductor current is i L3 (t3)=i L3 (t2)-V C (t-t2) / L3.

[0039] like Figure 7 The t3-t4 switching mode is shown. t At time 3, the sixth switch tube Q6 and the seventh switch tube Q7 are turned off. After the dead time, the fifth switch tube Q5 and the eighth switch tube Q8 are turned on with zero voltage, and the switch states of other switch tubes remain unchanged. At this time, the current of the first winding of the transformer is i1(t4)=i1(t3)+(V A -Nab V B )(t-t3) / L1, the second inductor current is i L2 (t4)=i L2 (t3)+(N ca V A -V C )(t-t3) / L2, the third inductor current is i L3 (t4)=i L3 (t3)-V C (t-t3) / L3.

[0040] To sum up, the present invention adopts the dual active bridge integrated current doubler rectifier three-port topology structure and its control method based on the above principle, which can realize zero voltage switching of ten switch tubes in the topology structure, effectively reducing switching losses. Not only does the topology structure have the advantages of simple structure, low output ripple and low cost compared with the existing scheme, but it also realizes continuous energy transfer between the three ports through the phase shift angle. The control is simple and easy to implement, which effectively avoids the problems of large size, high loss and discontinuous control brought by the circuit breaker in some schemes, and further improves the system efficiency.

Claims

1. A dual active bridge integrated current doubler rectifier three-port topology structure, the circuit of which consists of an A port circuit, a B port circuit, a C port circuit and a transformer, characterized in that: The A port circuit is composed of a DC busbar such as a fuel cell, a first capacitor C1, a first switch tube Q1, a second switch tube Q2, a third switch tube Q3 and a fourth switch tube Q4 to form a DC busbar H-bridge circuit for a fuel cell; the B port circuit is composed of a first inductor L1, a fifth switch tube Q5, a sixth switch tube Q6, a seventh switch tube Q7, an eighth switch tube Q8, a second capacitor C2 and a high-voltage battery to form a high-voltage battery H-bridge circuit; the C port circuit is composed of a ninth switch tube Q9, a tenth switch tube Q 10 , a second inductor L2, a third inductor L3, a third capacitor C3 and a low-voltage battery, the positive electrode of the low-voltage battery is respectively connected to one end of the third capacitor C3, one end of the second inductor L2 and one end of the third inductor L3; the negative electrode of the low-voltage battery is respectively connected to the other end of the third capacitor C3, the source of the ninth switch tube Q9 and the source of the tenth switch tube Q 10 The source of the transformer is connected; one end of the third winding N3 of the transformer is connected to the drain of the ninth switch tube Q9 and the other end of the second inductor L2; the other end of the third winding N3 of the transformer is connected to the drain of the tenth switch tube Q 10 The drain of the transformer is connected to the other end of the third inductor L3; the A port circuit, the B port circuit and the C port circuit are connected through the first winding N1, the second winding N2 and the third winding N3 of the transformer respectively; A control method for a dual active bridge integrated current doubler rectifier three-port topology structure: controlling the power transfer between the A-port circuit and the C-port circuit by lagging the internal phase shift angle of the first switch tube Q1 by the fourth switch tube Q4; The power transfer between the A port circuit and the B port circuit is controlled by lagging the external phase shift angle of the fourth switch tube Q4 by the fifth switch tube Q5 and the eighth switch tube Q8; the ninth switch tube Q9 lags the second switch tube Q2 by a resonance delay, and the tenth switch tube Q 10 The first switch tube Q1 is delayed by a resonance delay.

2. A dual active bridge integrated current doubler rectifier three-port topology structure according to claim 1, characterized in that: The positive electrode of the DC busbar of the fuel cell or the like is respectively connected to one end of the first capacitor C1, the drain of the third switch tube Q3 and the drain of the first switch tube Q1; the negative electrode of the DC busbar of the fuel cell or the like is respectively connected to the other end of the first capacitor C1, the source of the fourth switch tube Q4 and the source of the second switch tube Q2; one end of the first winding N1 of the transformer is connected to the source of the first switch tube Q1 and the drain of the second switch tube Q2; the other end of the first winding N1 of the transformer is connected to the source of the third switch tube Q3 and the drain of the fourth switch tube Q4.

3. The dual active bridge integrated current doubler rectifier three-port topology structure according to claim 1, characterized in that: The positive electrode of the high-voltage battery is respectively connected to one end of the second capacitor C2, the drain of the seventh switch tube Q7 and the drain of the fifth switch tube Q5; the negative electrode of the high-voltage battery is respectively connected to the other end of the second capacitor C2, the source of the eighth switch tube Q8 and the source of the sixth switch tube Q6; one end of the second winding N2 of the transformer is connected to one end of the first inductor L1, and the other end of the first inductor L1 is connected to the source of the fifth switch tube Q5 and the drain of the sixth switch tube Q6; the other end of the second winding N2 of the transformer is connected to the source of the seventh switch tube Q7 and the drain of the eighth switch tube Q8.

4. The control method of a dual active bridge integrated current doubler rectifier three-port topology structure according to claim 1, characterized in that: The first switch tube Q1 and the second switch tube Q2 are both turned on for half a cycle and are complementary to each other; the third switch tube Q3 and the fourth switch tube Q4 are both turned on for half a cycle and are complementary to each other; the fifth switch tube Q5 and the sixth switch tube Q6 are both turned on for half a cycle and are complementary to each other; the seventh switch tube Q7 and the eighth switch tube Q8 are both turned on for half a cycle and are complementary to each other; the fourth switch tube Q4 lags behind the first switch tube Q1 by an inner phase shift angle; the fifth switch tube Q5 and the eighth switch tube Q8 lag behind the fourth switch tube Q4 by an outer phase shift angle; the ninth switch tube Q9 and the tenth switch tube Q1 10 The conduction time is half a cycle plus an internal phase shift angle.

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