Bidirectional resonance type DAB control method of wide-range and full-working-condition ZVS

Abstract

The invention discloses a bidirectional resonance type DAB control method of a wide-range and full-working-condition ZVS. According to a power interval where given power is located, the working mode of the bidirectional resonance type DAB is divided into an extremely light load mode, a medium-low load mode and a medium-high load mode, and then control of four degrees of freedom including triple phase shifting and frequency modulation is carried out. According to the invention, switching among three modes can be realized according to different given power conditions, ZVS can be realized in a full working condition range (including a forward full working condition and a reverse full working condition), and the circuit operation efficiency under heavy-load and medium-load working conditions can be improved.

Description

Technical Field

[0001] The present invention relates to a control method of a resonant dual active bridge circuit (DAB) in the field of new energy converters, and in particular to a control method and system that can realize a wide gain range and full-condition ZVS of a bidirectional resonant dual active bridge DC-DC circuit and optimize efficiency. Background Art

[0002] The demand for wide-range bidirectional DC-DC converters has increased significantly in similar fields such as electric vehicle charging piles, energy storage converters, and communication power supplies. Taking electric vehicle charging piles as an example, the high efficiency, miniaturization, and low-cost development of the product have attracted much attention in the current market. In addition, the construction of smart energy networks has accelerated, which has led to an increasing demand for bidirectional energy transmission (V2G) of charging piles, requiring charging pile circuits to have bidirectional working capabilities.

[0003] Early DC charging piles adopted a two-stage topology, with an AC-DC rectifier circuit in the front stage and LLC as a DC-DC converter in the back stage. However, the traditional LLC circuit lacks bidirectional capability and cannot realize V2G function. Although the CLLC circuit has bidirectional buck-boost capability, its gain range is limited and it is difficult to adapt to the requirements of battery capacity and grid voltage fluctuations. Too wide a gain range will make the design of the CLLC resonant cavity more difficult. In some scenarios, the resonant cavity parameters that meet specific gains can only exist in theory and are difficult to commercialize. Some products (including charging piles, user energy storage systems and other similar products) expand the gain range of the converter by adding a buck or boost circuit after the CLLC, but the three-stage circuit will increase the cost and product size.

[0004] The dual active bridge circuit (DAB) can meet the bidirectional wide range requirements, but the traditional dual active bridge circuit has defects such as large reactive circulating current and large shutdown current, and has not been widely commercialized. In recent years, there have been studies on resonant DAB circuits and methods of improving efficiency using multiple phase shifting technology, but it is difficult to take into account efficiency, wide range and zero voltage switching (ZVS) at the same time.

[0005] Once ZVS is lost, on the one hand, the switching loss increases, and on the other hand, at a higher voltage platform (such as 400V), power electronic switching devices can only use IGBT, SiC and other devices. IGBT devices have a slow working speed and low operating frequency, which is not conducive to circuit miniaturization design. The high price of SiC devices is not conducive to cost control, and in the case of hard switching, the switching stress of power electronic devices is large, and the corresponding drive signal, voltage and current spikes are difficult to suppress, which will cause serious electromagnetic interference and reduce the stability and reliability of circuit operation. Summary of the invention

[0006] In order to solve the problems existing in the background technology, the present invention proposes a wide-range and full-condition ZVS bidirectional resonant DAB control method. The present invention can switch between three modes according to different load conditions through the control of four degrees of freedom of triple phase shift + frequency modulation, realize full-range ZVS, and improve the circuit operation efficiency under heavy and medium load conditions.

[0007] The technical solution of the present invention is as follows:

[0008] 1. A bidirectional resonant DAB control method with wide range and full-condition ZVS

[0009] Get the input voltage U of the bidirectional resonant DAB in , output voltage U out , according to the input voltage U in and output voltage U out Determine the voltage boost / buck situation of bidirectional resonant DAB;

[0010] Get the given power P of the two-way resonance DAB ref , according to the given power P of the two-way resonance DAB ref Determine the working mode of two-way resonance DAB;

[0011] According to the input voltage U of the bidirectional resonance DAB in , output voltage U out As well as the voltage increase / decrease situation, working mode, the primary side internal phase shift angle α, the secondary side internal phase shift angle β, and the external phase shift angle of the bidirectional resonant DAB And the switching frequency f w Control is performed so that the two-way resonant DAB does not lose ZVS under all working conditions, and the primary side internal phase shift angle α, the secondary side internal phase shift angle β, and the external phase shift angle And the switching frequency f w Switch smoothly between different working modes.

[0012] According to the input voltage U in and output voltage U out Determine the voltage boost / buck situation of the bidirectional resonant DAB, specifically:

[0013] When the input voltage U in is the primary voltage, the output voltage U out When n·U is the secondary side voltage, in >U out The bidirectional resonant DAB is in the boost condition, satisfying n·U in ≤U out The bidirectional resonant DAB is in a buck condition, where n is the ratio of the number of secondary turns to the number of primary turns.

[0014] The given power P according to the two-way resonance type DAB ref Determine the working mode of the two-way resonant DAB, specifically:

[0015] When the given power P of the two-way resonance DAB ref When it is greater than the medium-high load power lower limit P1, the working mode of the bidirectional resonance DAB is the medium-high load mode;

[0016] When the given power P of the two-way resonance DAB ref When it is greater than the medium-low load power lower limit P2 and less than or equal to the medium-high load power lower limit P1, the working mode of the two-way resonance type DAB is the medium-low load mode;

[0017] When the given power P of the two-way resonance DAB ref When the power is less than or equal to the lower limit P2 of medium and low load power, the working mode of the bidirectional resonance type DAB is the extremely light load mode.

[0018] In the boost case, when the working mode of the bidirectional resonant DAB is the medium-high load mode, the primary side internal phase shift angle α, the secondary side internal phase shift angle β, and the external phase shift angle And the switching frequency f w The specific values ​​are:

[0019] α=0,

[0020]

[0021]

[0022] Among them, L r is the resonant inductance value, C r is the resonant capacitance value, a, b, c are the first to third intermediate parameters respectively, θ is the preset deviation phase angle, and n is the ratio of the secondary turns to the primary turns.

[0023] In the boost case, when the working mode of the bidirectional resonant DAB is the medium and low load mode, the primary side internal phase shift angle α, the secondary side internal phase shift angle β, and the external phase shift angle And the switching frequency f w The specific values ​​are:

[0024]

[0025] Among them, L r is the resonant inductance value, C r is the resonant capacitance value, a, b, c are the first to third intermediate parameters respectively, θ is the preset deviation phase angle, n is the ratio of the secondary turns to the primary turns, P2 is the lower limit of medium and low load power, and P1 is the lower limit of medium and high load power.

[0026] In the boost case, when the working mode of the bidirectional resonant DAB is the extremely light load mode, the primary side internal phase shift angle α, the secondary side internal phase shift angle β, and the external phase shift angle And the switching frequency f w The specific values ​​are:

[0027]

[0028] β=π-α-2θ

[0029]

[0030] Among them, L r is the resonant inductance value, C r is the resonant capacitance value, a, b, c are the first to third intermediate parameters respectively, θ is the preset deviation phase angle, n is the ratio of the secondary turns to the primary turns, and P2 is the lower limit of medium and low load power.

[0031] 2. A bidirectional resonant DAB control system with wide range and full-condition ZVS

[0032] The circuit voltage rise / fall situation judgment module is used to judge the voltage according to the input terminal voltage U in and output voltage U out Determine the voltage boost / buck situation of bidirectional resonant DAB;

[0033] The circuit working mode judgment module is used to determine the given power P of the two-way resonance DAB. ref Determine the working mode of two-way resonance DAB;

[0034] A controller for controlling the input voltage U of a bidirectional resonance type DAB in , output voltage U out As well as the voltage increase / decrease situation, working mode, the primary side internal phase shift angle α, the secondary side internal phase shift angle β, and the external phase shift angle of the bidirectional resonant DAB And the switching frequency f w Control is performed so that the two-way resonant DAB does not lose ZVS under all working conditions, and the primary side internal phase shift angle α, the secondary side internal phase shift angle β, and the external phase shift angle And the switching frequency f w Switch smoothly between different working modes.

[0035] The controller includes a medium-high load mode control unit, a medium-low load mode control unit and an extremely light load mode control unit.

[0036] 3. A computer device

[0037] The device includes a memory and a processor, wherein the memory stores a computer program, and when the processor executes the computer program, the steps of the bidirectional resonance type DAB control method with wide range and full-operating condition ZVS are implemented.

[0038] 4. A computer-readable storage medium

[0039] The medium stores a computer program, which, when executed by a processor, implements the steps of the bidirectional resonance type DAB control method with wide range and full-condition ZVS.

[0040] Compared with the prior art, the present invention has the following beneficial effects:

[0041] (1) The present invention can achieve full-range ZVS, ensuring that the circuit does not lose soft switching under medium-high load, medium-low load, and especially extremely light load;

[0042] (2) When the resonant DAB circuit of the present invention is operating in the medium and high load range, the operating frequency is the lowest, close to the resonant frequency, and the resonance degree is very high, which is beneficial to improving the circuit working efficiency;

[0043] (3) The resonant DAB circuit of the present invention always operates near the critical full ZVS point (one bridge arm of each primary and secondary side is near ZVS, hereinafter referred to as critical full ZVS) when operating in the medium-high load and medium-low load sections, so that the switch devices of the two groups of bridge arms are turned off and the turn-off current is close to 0, which is beneficial to improving the circuit working efficiency;

[0044] (4) When the resonant DAB circuit of the present invention is operated in the medium and high load range, the i under the same power condition is greatly reduced. r Effective value (RMS), which improves the overall working efficiency of the circuit;

[0045] (5) The resonant DAB circuit of the present invention can smoothly connect between extremely light, medium-low load, medium-high load modes and forward and reverse operation through control mode switching without phase shift angle and frequency jump. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] Figure 1 It is a schematic diagram of a bidirectional resonant DAB circuit and its control system.

[0047] Figure 2 This is a flow chart of the optimization control method proposed in the present invention. DETAILED DESCRIPTION

[0048] The invention is described in detail below with reference to the accompanying drawings and embodiments.

[0049] The invention proposes a wide range and full-condition ZVS bidirectional resonance type DAB control method according to a given power Pref The power range divides the working mode of the bidirectional resonant DAB into extremely light load mode, medium-low load mode, and medium-high load mode. Through the control of four degrees of freedom of triple phase shift + frequency modulation, it can switch between the three modes according to different given power conditions. It can achieve ZVS in the full operating range (including full forward operating conditions and full reverse operating conditions), and can improve the circuit operation efficiency under heavy load and medium load conditions.

[0050] Resonant DAB circuit and its control system Figure 1 As shown, the resonant DAB circuit includes 8 switch tubes S1 to S8, and the input end of the resonant DAB circuit is defined as the primary side, and the output end is the secondary side, and the power is transmitted from the input end to the output end. The first and second switch tubes S1 and S2 of the primary side form a group of bridge arms, and the third and fourth switch tubes S3 and S4 form a group of bridge arms; the fifth and sixth switch tubes S5 and S6 of the secondary side form a group of bridge arms, and the seventh and eighth switch tubes S7 and S8 form a group of bridge arms, with a total of two full-bridge circuits. The transformer T, the resonant capacitor value (capacitance value is Cr), and the secondary side resonant inductor (inductance value is Lr) are connected in series. In the control signal of the resonant DAB circuit, the control signals of the 8 switch tubes S1 to S8 are all square waves with dead zones and a duty cycle of 50%; the control signals of the first and second switch tubes S1 and S2 are complementary, the control signals of the third and fourth switch tubes S3 and S4 are complementary, the control signals of the fifth and sixth switch tubes S5 and S6 are complementary, and the control signals of the seventh and eighth switch tubes S7 and S8 are complementary. The control signal phase difference between the two half-bridge circuits on the primary side (i.e., the control signal phase difference between S1 and S3) is recorded as the primary side inner phase shift angle α, the control signal phase difference between the two half-bridge circuits on the secondary side (i.e., the control signal phase difference between S5 and S7) is recorded as the secondary side inner phase shift angle β, and the phase difference between the midpoint voltage difference of the primary bridge arm and the midpoint voltage difference of the secondary bridge arm is recorded as the outer phase shift angle

[0051] Input voltage U in , output voltage U out is the detection quantity; the transformer turns ratio n is the inherent parameter of the circuit; P ref is the given quantity of the system; the internal phase shift angle α of the primary side, the internal phase shift angle β of the secondary side, and the external phase shift angle And the switching frequency f w All of them are control quantities that can be set by the control system. In the present invention, the internal phase shift angle α of the primary side, the internal phase shift angle β of the secondary side, and the external phase shift angle And the switching frequency f w The specific value of can be calculated by an optimization control method proposed by the present invention.

[0052] like Figure 2 As shown, the present invention proposes a wide range and full-condition ZVS bidirectional resonance type DAB control method comprising:

[0053] Get the input voltage U of the bidirectional resonant DAB in , output voltage U out , according to the input voltage U in and output voltage U out Determine the voltage boost / buck situation of bidirectional resonant DAB;

[0054] Get the given power P of the two-way resonance DAB ref , according to the given power P of the two-way resonance DAB ref Determine the working mode of two-way resonance DAB;

[0055] According to the input voltage U of the bidirectional resonance DAB in , output voltage U out As well as the voltage increase / decrease situation, working mode, the primary side internal phase shift angle α, the secondary side internal phase shift angle β, and the external phase shift angle of the bidirectional resonant DAB And the switching frequency f w Control is performed to ensure that the bidirectional resonant DAB operates with high efficiency and does not lose ZVS under all operating conditions, and the primary side internal phase shift angle α, the secondary side internal phase shift angle β, and the external phase shift angle And the switching frequency f w Smoothly switch between different working modes, the connection between the three modes, α, β, f w The changes of the four control quantities are continuous (no sudden changes).

[0056] According to the input voltage U in and output voltage U out Determine the voltage boost / buck situation of the bidirectional resonant DAB, specifically:

[0057] When the input voltage U in is the primary voltage, the output voltage U out When n·U is the secondary side voltage, in >U out The bidirectional resonant DAB is in the boost condition, satisfying n·U in ≤U out The bidirectional resonant DAB is in a buck condition, where n is the ratio of the number of secondary turns to the number of primary turns.

[0058] According to the given power P of the two-way resonance DAB ref Determine the working mode of the two-way resonant DAB, specifically:

[0059] When the given power P of the two-way resonance DAB refWhen it is greater than the lower limit of medium and high load power P1, the working mode of the bidirectional resonant DAB is the medium and high load mode, that is, mode 1, and P1 is 50% of the rated power of the bidirectional resonant DAB;

[0060] When the given power P of the two-way resonance DAB ref When it is greater than the lower limit of medium and low load power P2 and less than or equal to the lower limit of medium and high load power P1, the working mode of the two-way resonance DAB is the medium and low load mode, that is, mode 2, and P2 is 20% of the rated power;

[0061] When the given power P of the two-way resonance DAB ref When the power level is less than or equal to the lower limit P2 of medium and low load power, the working mode of the bidirectional resonant DAB is the extremely light load mode, that is, mode three.

[0062] In the boost case, when the working mode of the bidirectional resonant DAB is the medium-high load mode, the primary side internal phase shift angle α, the secondary side internal phase shift angle β, and the external phase shift angle And the switching frequency f w The specific values ​​are:

[0063] In the ideal case without considering the dead zone, the primary side internal phase shift angle α, the secondary side internal phase shift angle β, and the external phase shift angle in the medium and high load mode are And the switching frequency f w Satisfy the following formulas respectively:

[0064]

[0065]

[0066] According to the input voltage U in , output voltage U out The ratio of the secondary turns to the primary turns n uniquely determines the external shift phase angle Therefore, the calculation expressions of the phase shift angle α in the primary side and the phase shift angle β in the secondary side can be simplified as follows:

[0067] α=0, that is, the primary side has no internal phase shift angle;

[0068] Considering the dead zone, the external phase angle The value of the external phase angle is greater than the ideal state, which can broaden the soft switching range taking into account the dead zone (making it easier to achieve soft switching). The specific formula is as follows:

[0069] α=0,

[0070]

[0071] Among them, L r is the resonant inductance value, C ris the resonant capacitance value, a, b, c are the first to third intermediate parameters respectively, θ is the preset deviation phase angle, and the specific value of θ can be customized according to the ZVS situation. The larger θ is, the wider the ZVS range is, but at the same time it will reduce the circuit operation efficiency to a certain extent, and n is the ratio of the secondary turns to the primary turns.

[0072] This model has three characteristics:

[0073] ① The resonant cavity current i under the same power r The effective value is the smallest, which can greatly improve the circuit operation efficiency under medium and high loads;

[0074] ② Both the primary and secondary sides are in critical full ZVS (i.e., each of the primary and secondary sides has a group of bridge arms with critical ZVS - disconnected near current zero crossing, and the remaining bridge arms all achieve ZVS).

[0075] ③ By configuring the inductance of the resonant inductor and the capacitance of the resonant capacitor, the switching frequency in this mode can be made close to the resonant frequency, which is beneficial to improving the circuit operation efficiency.

[0076] In the boost case, when the working mode of the bidirectional resonant DAB is the medium and low load mode, the primary side internal phase shift angle α, the secondary side internal phase shift angle β, and the external phase shift angle And the switching frequency f w The specific values ​​are:

[0077] In the ideal state without considering the dead zone, the phase shift angle α in the primary side, the phase shift angle β in the secondary side, and the switching frequency f w The formula is the same as the ideal state of medium and high load mode without considering the dead zone, so when the mode is switched, α, β, f w There will be no mutation, as follows:

[0078]

[0079] Outward phase angle With a given transmission power P ref Change, the specific calculation formula is:

[0080]

[0081] If P ref When the lower limit of medium and high load power P1 is reached, With mode one The values ​​are consistent, so the external phase angle can be achieved Smooth transition when switching between mode 1 and mode 2.

[0082] Considering the dead zone, the primary side internal phase shift angle α, the secondary side internal phase shift angle β, and the external phase shift angle in the medium and low load mode are And the switching frequency f wThe formula is as follows:

[0083]

[0084] Among them, L r is the resonant inductance value, C r is the resonant capacitance value, a, b, c are the first to third intermediate parameters respectively, θ is the preset deviation phase angle, and the specific value of θ can be customized according to the ZVS situation. The larger θ is, the wider the ZVS range is, but at the same time it will reduce the circuit operation efficiency to a certain extent, n is the ratio of the number of secondary turns to the number of primary turns, P2 is the lower limit of medium and low load power, and P1 is the lower limit of medium and high load power.

[0085] This mode has two characteristics:

[0086] ① The original secondary side switch tube is critically full ZVS.

[0087] ②f w , When the critical full ZVS is achieved, the transmission power is minimum. The peak switching frequency of mode 2 can be reduced to a certain extent, the circuit operation efficiency can be improved, and the electromagnetic compatibility problem caused by excessive switching frequency can be avoided.

[0088] In the boost case, when the working mode of the bidirectional resonant DAB is the extremely light load mode, the primary side internal phase shift angle α, the secondary side internal phase shift angle β, and the external phase shift angle And the switching frequency f w The specific values ​​are:

[0089] In the ideal state without considering the dead zone, the phase shift angle α in the primary side, the phase shift angle β in the secondary side and the switching frequency f w With mode 2 P ref =P2, The corresponding α, β, and f w The values ​​of α, β, and f are consistent and remain unchanged, thus ensuring that when the mode is switched, w Will not mutate, that is:

[0090]

[0091] α, β, f w The three remain unchanged. Follow P ref Change, The specific calculation method is:

[0092] in

[0093] The calculation formula shows that if P refGet the upper power limit P2 of mode 3, With mode 2 P ref When obtaining the lower limit power of mode 2 The values ​​are consistent, so the external phase angle can be achieved Smooth switching from mode 2 to mode 3.

[0094] Considering the dead zone, the primary side internal phase shift angle α, the secondary side internal phase shift angle β, and the external phase shift angle in the extremely light load mode are And the switching frequency f w The formula is as follows:

[0095]

[0096] Among them, L r is the resonant inductance value, C r is the resonant capacitance value, a, b, c are the first to third intermediate parameters respectively, θ is the preset deviation phase angle, and the specific value of θ can be customized according to the ZVS situation. The larger θ is, the wider the ZVS range is, but at the same time it will reduce the circuit operation efficiency to a certain extent, n is the ratio of the secondary turns to the primary turns, and P2 is the lower limit of medium and low load power.

[0097] The voltage reduction is symmetrical to the voltage increase, that is, the input voltage U in , output voltage U out The phase shift angle α in the primary side and the phase shift angle β in the secondary side are interchanged. The details are as follows:

[0098] Mode 1, medium and high load segment:

[0099] 1) In the ideal case without considering the dead zone, α, β, and f of mode 1 and mode 2 are w All meet the following requirements:

[0100]

[0101] Mode 1 According to the detection value U in , U out and n are uniquely determined, Therefore, the calculation expressions for the internal phase shift angles α and β in the above conditions can be simplified as follows:

[0102] The secondary side internal phase shift angle β = 0, that is, the secondary side has no internal phase shift angle;

[0103] Primary side internal phase shift angle

[0104] 2) Considering the dead zone:

[0105] Primary side internal phase shift angle consistent with the ideal state;

[0106] The phase shift angle β = 0 in the secondary side is consistent with the ideal state;

[0107] Considering the dead zone, the external phase angle The value of the external phase angle is greater than the ideal state (the same as mode 2), which can broaden the soft switching range taking into account the dead zone (easier to achieve soft switching) in The specific value of θ can be customized according to the ZVS situation. The larger θ is, the wider the ZVS range is, but at the same time it will reduce the circuit operation efficiency to a certain extent;

[0108] The switching frequency expression remains unchanged, Where a = L r ·C r ·P ref , c=-P ref But because Unlike the ideal case, the value of the switching frequency also differs from the ideal case.

[0109] Mode 2, namely the transition state in the medium and low load segment:

[0110] 1) In the ideal state without considering the dead zone, α, β, f w The formula in mode 1 is still satisfied, so when the mode is switched, α, β, f w No mutation:

[0111]

[0112] With a given transmission power P ref Change, The specific calculation method is:

[0113]

[0114] 2) Considering the dead zone:

[0115]

[0116] With a given transmission power P ref Change, The specific calculation method is:

[0117]

[0118] Mode 3, extremely light load segment:

[0119] 1) In the ideal case without considering the dead zone, α, β, and f w satisfy:

[0120]

[0121] And α, β, f w The three remain unchanged. Follow P ref Change, The specific calculation method is:

[0122]

[0123] 2) Considering the dead zone, the primary side internal phase shift angle α, the secondary side internal phase shift angle β, and the external phase shift angle And the switching frequency f w The formula is as follows:

[0124]

[0125] The present invention also proposes a wide range and full-condition ZVS bidirectional resonance type DAB control system, the system comprising:

[0126] The circuit voltage rise / fall situation judgment module is used to judge the voltage according to the input terminal voltage U in and output voltage U out Determine the voltage boost / buck situation of bidirectional resonant DAB;

[0127] The circuit working mode judgment module is used to determine the given power P of the two-way resonance DAB. ref Determine the working mode of two-way resonance DAB;

[0128] A controller for controlling the input voltage U of a bidirectional resonance type DAB in , output voltage U out As well as the voltage increase / decrease situation, working mode, the primary side internal phase shift angle α, the secondary side internal phase shift angle β, and the external phase shift angle of the bidirectional resonant DAB And the switching frequency f w Control is performed so that the two-way resonant DAB does not lose ZVS under all working conditions, and the primary side internal phase shift angle α, the secondary side internal phase shift angle β, and the external phase shift angle And the switching frequency f w Switch smoothly between different working modes.

[0129] The controller includes a medium-high load mode control unit, a medium-low load mode control unit and an extremely light load mode control unit.

[0130] The present invention also proposes a computer device, including a memory and a processor, wherein the memory stores a computer program, and when the processor executes the computer program, steps of a bidirectional resonance type DAB control method with wide range and full working condition ZVS are implemented.

[0131] The present invention also proposes a computer-readable storage medium on which a computer program is stored. When the computer program is executed by a processor, the steps of a bidirectional resonance type DAB control method with wide range and full working condition ZVS are implemented.

[0132] Finally, it should be noted that the above embodiments and explanations are only used to illustrate the technical solution of the present invention rather than to limit it. Those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the spirit and scope disclosed in the technical solution of the present invention, which should be included in the scope of protection of the claims of the present invention.

Claims

1. A wide range and full-condition ZVS bidirectional resonance DAB control method, characterized in that: include: Get the input voltage U of the bidirectional resonant DAB in , output voltage U out , according to the input voltage U in and output voltage U out Determine the voltage boost / buck situation of bidirectional resonant DAB; Get the given power P of the two-way resonance DAB ref , according to the given power P of the two-way resonance DAB ref Determine the working mode of two-way resonance DAB; According to the input voltage U of the bidirectional resonance DAB in , output voltage U out As well as the voltage increase / decrease situation, working mode, the primary side internal phase shift angle α, the secondary side internal phase shift angle β, and the external phase shift angle of the bidirectional resonant DAB And the switching frequency f w Control is performed so that the bidirectional resonant DAB does not lose ZVS under all working conditions, and the primary side internal phase shift angle α, the secondary side internal phase shift angle β, and the external phase shift angle And the switching frequency f w Switch smoothly between different working modes.

2. A wide range and full-condition ZVS bidirectional resonance DAB control method according to claim 1, characterized in that: According to the input voltage U in and output voltage U out Determine the voltage boost / buck situation of the bidirectional resonant DAB, specifically: When the input voltage U in is the primary voltage, the output voltage U out When n·U is the secondary side voltage, in >U out The bidirectional resonant DAB is in the boost condition, satisfying n·U in ≤U out The bidirectional resonant DAB is in a step-down condition, where n is the ratio of the number of secondary turns to the number of primary turns.

3. A wide range and full-condition ZVS bidirectional resonance DAB control method according to claim 1, characterized in that: The given power P according to the two-way resonance type DAB ref Determine the working mode of the two-way resonant DAB, specifically: When the given power P of the two-way resonance DAB ref When it is greater than the medium-high load power lower limit P1, the working mode of the bidirectional resonance DAB is the medium-high load mode; When the given power P of the two-way resonance DAB ref When it is greater than the medium-low load power lower limit P2 and less than or equal to the medium-high load power lower limit P1, the working mode of the two-way resonance type DAB is the medium-low load mode; When the given power P of the two-way resonance DAB ref When the power is less than or equal to the lower limit P2 of medium and low load power, the working mode of the bidirectional resonant DAB is the extremely light load mode.

4. A wide range and full-condition ZVS bidirectional resonance DAB control method according to claim 3, characterized in that: In the boost case, when the working mode of the bidirectional resonant DAB is the medium-high load mode, the primary side internal phase shift angle α, the secondary side internal phase shift angle β, and the external phase shift angle And the switching frequency f w The specific values ​​are: α＝0， a=L r ·C r ·P ref , c=-P ref , Among them, L r is the resonant inductance value, C r is the resonant capacitance value, a, b, c are the first to third intermediate parameters respectively, θ is the preset deviation phase angle, and n is the ratio of the secondary turns to the primary turns.

5. A wide range and full-condition ZVS bidirectional resonance DAB control method according to claim 3, characterized in that: In the boost case, when the working mode of the bidirectional resonant DAB is the medium and low load mode, the primary side internal phase shift angle α, the secondary side internal phase shift angle β, and the external phase shift angle And the switching frequency f w The specific values ​​are: a=L r ·C r ·P ref , c=-P ref , Among them, L r is the resonant inductance value, C r is the resonant capacitance value, a, b, c are the first to third intermediate parameters respectively, θ is the preset deviation phase angle, n is the ratio of the secondary turns to the primary turns, P2 is the lower limit of medium and low load power, and P1 is the lower limit of medium and high load power.

6. A wide range and full-condition ZVS bidirectional resonance type DAB control method according to claim 3, characterized in that: In the boost case, when the working mode of the bidirectional resonant DAB is the extremely light load mode, the primary side internal phase shift angle α, the secondary side internal phase shift angle β, and the external phase shift angle And the switching frequency f w The specific values ​​are: β=π-α-2θ a=L r ·C r ·P2, c=-P2 Among them, L r is the resonant inductance value, C r is the resonant capacitance value, a, b, c are the first to third intermediate parameters respectively, θ is the preset deviation phase angle, n is the ratio of the secondary turns to the primary turns, and P2 is the lower limit of medium and low load power.

7. A wide range and full-condition ZVS bidirectional resonance DAB control system, characterized in that: include: The circuit voltage rise / fall situation judgment module is used to judge the voltage according to the input terminal voltage U in and output voltage U out Determine the voltage boost / buck situation of bidirectional resonant DAB; The circuit working mode judgment module is used to determine the given power P of the two-way resonance DAB. ref Determine the working mode of two-way resonance DAB; A controller for controlling the input voltage U of a bidirectional resonance type DAB in , output voltage U out As well as the voltage increase / decrease situation, working mode, the primary side internal phase shift angle α, the secondary side internal phase shift angle β, and the external phase shift angle of the bidirectional resonant DAB And the switching frequency f w Control is performed so that the bidirectional resonant DAB does not lose ZVS under all working conditions, and the primary side internal phase shift angle α, the secondary side internal phase shift angle β, and the external phase shift angle And the switching frequency f w Switch smoothly between different working modes.

8. A wide range and full-condition ZVS bidirectional resonance DAB control system according to claim 7, characterized in that: The controller includes a medium-high load mode control unit, a medium-low load mode control unit and an extremely light load mode control unit.

9. A computer device comprising a memory and a processor, wherein the memory stores a computer program, wherein: When the processor executes the computer program, the steps of the bidirectional resonance type DAB control method with wide range and full-condition ZVS as described in any one of claims 1 to 6 are implemented.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of a wide-range and full-condition ZVS bidirectional resonance DAB control method as claimed in any one of claims 1 to 6 are implemented.

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