Strongly anti-shift wireless power transmission system based on clamping and reconfiguration rectifier

Abstract

The application discloses a strong anti-deviation wireless power transmission system based on a clamping and reconfiguration rectifier, and belongs to the technical field of wireless power transmission, and solves the problem that the output power is unstable due to a wide range of changes in the coupling coefficient of the existing wireless power transmission system. The application is composed of a primary energy emission module, a primary clamping module and a secondary energy pickup module; the primary energy emission module comprises a direct current power supply, a high-frequency inverter circuit, a primary compensation capacitor, a primary clamping winding and an emission coil; the primary clamping part comprises a clamping rectifier, a clamping compensation capacitor and a secondary clamping winding; and the secondary energy pickup module comprises a pickup coil, a secondary compensation capacitor, a reconfiguration rectifier, a filter circuit and a resistance load. The application can maintain stable power output when the system deviates and the coupling coefficient changes in a wide range, improve the anti-deviation capability of the system, and does not have a complex control strategy.

Description

Technical Field

[0001] This invention belongs to the field of wireless power transmission technology and relates to a strong offset-resistant wireless power transmission system based on clamping and reconfiguration rectifiers. Background Technology

[0002] Inductive Power Transfer (IPT) is a technology that uses loosely coupled transformers to wirelessly transmit electrical energy. It offers advantages such as flexible, safe, and reliable power supply. Currently, this technology, with its flexible power supply and high reliability, is widely used in wireless power supply applications for portable electronic products, electric vehicles, and other fields.

[0003] The main components and working process of the existing wireless power transmission system are as follows: the incoming power frequency AC is rectified and filtered by PFC and then converted into DC. The DC is then converted into high frequency AC by a high frequency inverter. The high frequency AC then flows through the primary-side compensation network and the transmitting coil to generate a high frequency alternating magnetic field. Under the action of electromagnetic induction, the receiving coil in the high frequency alternating magnetic field generates a high frequency induced voltage. Finally, the high frequency induced voltage flows through the secondary-side compensation network and the high frequency rectification and filtering circuit converts the induced energy into DC to supply power to the load.

[0004] For IPT systems, the relative positions of the transmitting and receiving coils cause significant fluctuations in the coupling coefficient k, leading to a reduction in system transmission power and efficiency. To address this issue, several methods are commonly used: 1. Closed-loop control methods: These include adding a controller to the inverter or rectifier stage to control phase shifting by adjusting the inverter's conduction angle, thereby stabilizing the transmission power; or adding a DC-DC converter at the high-frequency inverter input / high-frequency rectifier output to adjust the system output power; or adding a variable inductor or variable capacitor to the primary or secondary compensation network to alter the system's energy transfer characteristics and thus stabilize the output power. However, these methods place high demands on the accuracy and real-time performance of the receiver feedback signal, and they increase system complexity and control costs. 2. Hybrid topology design methods: These methods combine two circuit topologies with opposite output characteristics, utilizing the mutual compensation between different topologies to stabilize the output power during offset. However, this method is structurally complex and has high system costs. III. Detuning Compensation Network Parameter Design Method: By rationally designing the circuit parameters in the primary and secondary compensation networks, a non-monotonic power smoothing range is created where power first rises and then falls with coupling changes, thus achieving stable power transmission. However, this method has a limited offset range (typically allowing only a 2x coupling change), and because the impedance matching degree decreases as the offset process progresses, it is difficult to guarantee high-efficiency system operation. Summary of the Invention

[0005] The purpose of this invention is to provide a strong offset-resistant wireless power transfer system based on clamping and reconfiguration rectifiers. This system solves the problems of complex structure, high cost, small offset range, and low efficiency in existing wireless power transfer systems when the transmitting and receiving coils are in relative positions. The clamping rectifier adaptively absorbs excessive energy when the transmitting and receiving coils are in relative positions, and the reconfiguration rectifier changes the equivalent AC load from one value to another to resist large variations in the coupling coefficient and maintain stable output power.

[0006] The technical solution adopted in this invention is as follows:

[0007] A strong offset-resistant wireless power transfer system based on clamping and reconfiguration rectifiers includes a primary-side energy transmission module, a primary-side clamping module, and a secondary-side energy pickup module.

[0008] The primary-side energy transmitting module is used to transmit the DC power supply output energy to the primary-side clamping module and the secondary-side energy pickup module. The primary-side energy transmitting module includes a DC power supply (E), a high-frequency inverter (H), and a primary compensation capacitor (C). P ), primary clamping winding (L) CP ) and transmitting coil (L P The specific connection is as follows: the positive and negative terminals of the DC power supply (E) are connected to the DC input terminal of the high-frequency inverter (H), and the AC output terminal of the high-frequency inverter (H) is connected to the primary compensation capacitor (C). P ), transmitting coil (L) P ) and primary clamping winding (L CP They are connected in series to form a closed loop.

[0009] The primary-side clamping module is used to adaptively recover a portion of the energy emitted from the primary side back to the DC power supply. The primary-side clamping module includes a clamping rectifier (CD) and a clamping compensation capacitor (C). C ) and secondary clamping winding (L CS The specific connection is as follows: the DC output terminal of the clamping rectifier (CD) is connected to the DC power supply (E) in the primary-side energy emission module, and the AC input terminal of the clamping rectifier (CD) is connected to the clamping compensation capacitor (C). C ) and secondary clamping winding (L CS They are connected in series to form a closed loop.

[0010] The secondary-side energy pickup module is used to receive the energy emitted by the primary-side energy transmitting module and output a resistive load. The secondary-side energy pickup module includes a receiving coil (L... S Secondary compensation capacitor (C) S ), reconfigurable rectifier (RD), controller (K), filter capacitor (C) FThe reconfigurable rectifier (RD) consists of a bridge circuit composed of three diodes (D1-D3) and one switching transistor (Q1), where the switching transistor (Q1) forms any one of the lower arms of the bridge circuit. The specific connection relationship of the secondary-side energy pickup module is as follows: the DC output terminal of the reconfigurable rectifier (RD) is connected to the filter capacitor (C) respectively. F The load (R) is connected in parallel, and the AC input terminal of the reconfigurable rectifier (RD) is connected to the secondary compensation capacitor (C). S ), receiving coil (L) S The series circuits form a closed loop, and the control terminal of the switching transistor (Q1) in the reconfigured rectifier (RD) is connected to the controller (K).

[0011] Furthermore, the system operating frequency is defined as ω, and the system allows the transmitting coil (L) to operate at a frequency of ω. P ) and receiving coil (L S The maximum coupling coefficient between them is k max The system allows the transmitting coil (L) P ) and receiving coil (L S The minimum coupling coefficient between them is k min The transmitting coil (L) corresponding to the inactive full-bridge mode and the activated full-bridge mode. P ) and receiving coil (L S The critical coupling coefficient is k. cross1 The transmitting coils (L) corresponding to the activated full-bridge mode and the deactivated half-bridge mode. P ) and receiving coil (L S The critical coupling coefficient is k. cross2 The transmitting coil (L) corresponding to the inactive half-bridge mode and the active half-bridge mode. P ) and receiving coil (L S The critical coupling coefficient is k. cross3 The maximum allowable output power of the system is P. max The minimum allowable output power of the system is P. min The system allows fluctuations of β, and the transmitting coil (L) P The inductance value is Receiver coil (L) S The inductance value is Primary clamping winding (L) CP The inductance value is Secondary clamping winding (L) CS The inductance value is The secondary compensation capacitor (C) S capacitance value Determined by equation (13):

[0012]

[0013] The primary compensation capacitor (C) P capacitance value Determined by equation (14):

[0014]

[0015] The clamping compensation capacitor (C) C capacitance value Determined by equation (15):

[0016]

[0017] The primary clamping winding (L) CP ) and secondary clamping winding (L CS Mutual induction between (M) C mutual inductance value Determined by equation (16):

[0018]

[0019] The resistance value of the resistive load (R) Determined by equation (17):

[0020]

[0021] The voltage value of the DC power supply (E) Determined by equation (18):

[0022]

[0023] The system described allows the transmitting coil (L) P ) and receiving coil (L S The minimum coupling coefficient k between) min Determined by equation (19):

[0024]

[0025] The system described refers to the transmitting coils (L) corresponding to the inactive and activated full-bridge modes. P ) and receiving coil (L S The critical coupling coefficient k) corss1 Determined by equation (20):

[0026]

[0027] The system's activated full-bridge mode and the inactive half-bridge mode correspond to the corresponding transmitting coils (L) P ) and receiving coil (L S The critical coupling coefficient is k. cross2Determined by equation (21):

[0028]

[0029] The system described refers to the transmitting coil (L) corresponding to the inactive half-bridge mode and the activated half-bridge mode. P ) and receiving coil (L S The critical coupling coefficient is k. cross3 Determined by equation (22):

[0030]

[0031] The minimum allowable output power P of the system min Determined by equation (23):

[0032]

[0033] The allowable fluctuation β of the system is determined by equation (24):

[0034]

[0035] Furthermore, the aforementioned strong offset-resistant wireless power transmission system based on clamping and reconfiguration rectifiers has four operating modes: inactive full-bridge mode, active full-bridge mode, inactive half-bridge mode, and active half-bridge mode. In the inactive full-bridge mode, the clamping rectifier is not operating, the primary-side clamping module does not recover part of the energy transmitted from the primary side to the DC power supply (E), and the switching transistor (Q) in the reconfiguration rectifier is not turned on; the reconfiguration rectifier operates in a full-bridge circuit. In the active full-bridge mode, the clamping rectifier is operating, the primary-side clamping module recovers part of the energy transmitted from the primary side to the DC power supply (E), and the switching transistor (Q) in the reconfiguration rectifier is turned on; the reconfiguration rectifier operates in a half-bridge circuit. In the inactive half-bridge mode, the clamping rectifier is not operating, the primary-side clamping module does not recover part of the energy transmitted from the primary side to the DC power supply (E), and the switching transistor (Q) in the reconfiguration rectifier is not turned on; the reconfiguration rectifier operates in a full-bridge circuit. The activated half-bridge mode is when the clamping rectifier in the system operates, and the primary-side clamping module recovers part of the energy emitted from the primary side back to the DC power supply (E); the switching transistor (Q) in the reconfiguration rectifier is turned on, and the reconfiguration rectifier operates in a half-bridge circuit. When the transmitting coil (L) P ) and receiving coil (L S The coupling coefficient (k) between the two modes is less than that between the transmitting coils (L) corresponding to the activated full-bridge mode and the inactive half-bridge mode of the system. P ) and receiving coil (L S The critical coupling coefficient is k. cross2 When the controller (K) turns on the switching transistor (Q) in the reconfigurable rectifier, the reconfigurable rectifier operates in a half-bridge circuit; when the transmitting coil (L) turns on...P ) and receiving coil (L S The coupling coefficient (k) between the two modes is greater than that between the transmitting coils (L) corresponding to the activated full-bridge mode and the inactive half-bridge mode of the system. P ) and receiving coil (L S The critical coupling coefficient is k. cross2 When the controller (K) turns off the switching transistor (Q) in the reconfigurable rectifier, the reconfigurable rectifier operates in a full-bridge circuit; when the transmitting coil (L)... P ) and receiving coil (L S The coupling coefficient (k) between the two modes is equal to the coupling coefficient (L) between the corresponding transmitting coils of the activated full-bridge mode and the inactive half-bridge mode. P ) and receiving coil (L S The critical coupling coefficient is k. cross2 When the controller (K) is in the on or off state, the switch (Q) in the reconfigurable rectifier will be turned on or off. At this time, the reconfigurable rectifier will operate in a full-bridge or half-bridge circuit.

[0036] The method of using the technical solution of the present invention is as follows:

[0037] When the system is working, the transmitting coil (L) P ) and receiving coil (L S Without offset, its coupling coefficient (k) is defined as the maximum allowable coupling coefficient (k) of the system. max Transmitting coil (L) P ) and receiving coil (L S When there is an offset, the coupling coefficient decreases. When the coupling coefficient (k) decreases to the level of the transmitting coil (L) corresponding to the inactive full-bridge mode and the active full-bridge mode, the coupling coefficient decreases. P ) and receiving coil (L S The critical coupling coefficient is k. cross1 At this time, the system adaptively adjusts from the unactivated full-bridge mode to the activated full-bridge mode; when the coupling coefficient (k) drops again to the level corresponding to the transmitting coil (L) between the activated full-bridge mode and the unactivated half-bridge mode. P ) and receiving coil (L S The critical coupling coefficient is k. cross2 At this time, the controller (K) controls the switching transistor (Q) in the reconfigurable rectifier to close, causing the reconfigurable rectifier to switch from a full-bridge state to a half-bridge state, and the system switches from the active full-bridge mode to the inactive half-bridge mode; when the coupling coefficient (k) drops again to the level corresponding to the transmitting coil (L) between the inactive half-bridge mode and the active half-bridge mode... P ) and receiving coil (L S The critical coupling coefficient is k. cross3At this time, the system adaptively adjusts from the unactivated half-bridge mode to the activated half-bridge mode. Due to the change in the reconfigured rectifier state, the system impedance matching can be further improved, thereby improving system efficiency while maintaining stable system output power.

[0038] The present invention has the following beneficial effects:

[0039] 1. This invention proposes a strong offset-resistant wireless power transfer system based on clamping and reconfiguration rectifiers. Compared with existing wireless power transfer systems, it adds a primary-side clamping module, which divides the energy output from the primary-side energy transmission module into two paths. One path directly enters the secondary-side energy pickup module, while the other path is adaptively absorbed back into the power supply through the primary-side clamping module to ensure that the energy transmitted to the secondary-side energy pickup module remains unchanged. In addition, a reconfiguration rectifier is used in the secondary-side energy pickup module. By switching the rectifier, the impedance matching state of the system is changed, which not only ensures stable power output but also further improves the system offset range and system efficiency.

[0040] 2. Compared with existing solutions used in wireless power transmission systems when system offset occurs, this invention has the advantages of simple structure, low cost, and a large allowable range of movement. During operation, it only requires simple control of the switching transistor to continuously conduct or remain off, without complex control strategies, and the system efficiency is high. Attached Figure Description

[0041] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly described below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort, wherein:

[0042] Figure 1 This is a circuit diagram of the strong anti-offset wireless power transfer system based on clamping and reconfiguration rectifiers of the present invention;

[0043] Figure 2 This is the equivalent circuit diagram of the system of the present invention operating in the unactivated full-bridge mode;

[0044] Figure 3 This is the equivalent circuit diagram of the system of the present invention operating in the activated full-bridge mode;

[0045] Figure 4 This is the equivalent circuit diagram of the system of the present invention operating in the unactivated half-bridge mode;

[0046] Figure 5 This is the equivalent circuit diagram of the system of the present invention operating in the activated half-bridge mode;

[0047] Figure 6 This is the system output power curve under the change of coupling coefficient in this invention. Detailed Implementation

[0048] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only for explaining the invention and are not intended to limit the invention; that is, the described embodiments are merely some embodiments of the invention, and not all embodiments. The components of the embodiments of the invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0049] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0050] It should be noted that relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0051] A preferred embodiment of the present invention provides a strong offset-resistant wireless power transfer system based on a clamping and reconfiguration rectifier, such as... Figure 1 As shown, it includes a primary-side energy transmission module, a primary-side clamping module, and a secondary-side energy pickup module; the primary-side energy transmission module is used to transmit DC power output energy to the primary-side clamping module and the secondary-side energy pickup module. This system solves the problems of existing wireless power transmission systems, such as complex structure, high cost, limited offset range, and low efficiency, when the system is offset.

[0052] This invention includes a primary-side energy transmission module, a primary-side clamping module, and a secondary-side energy pickup module. The primary-side energy transmission module transmits the output energy of the DC power supply to the primary-side clamping module and the secondary-side energy pickup module. The primary-side energy transmission module includes a DC power supply (E), a high-frequency inverter (H), and a primary compensation capacitor (C).P ), primary clamping winding (L) CP ) and transmitting coil (L P The specific connection is as follows: the positive and negative terminals of the DC power supply (E) are connected to the DC input terminal of the high-frequency inverter (H), and the AC output terminal of the high-frequency inverter (H) is connected to the primary compensation capacitor (C). P ), transmitting coil (L) P ) and primary clamping winding (L CP They are connected in series to form a closed loop.

[0053] The primary-side clamping module is used to adaptively recover a portion of the energy emitted from the primary side back to the DC power supply. The primary-side clamping module includes a clamping rectifier (CD) and a clamping compensation capacitor (C). C ) and secondary clamping winding (L CS The specific connection is as follows: the DC output terminal of the clamping rectifier (CD) is connected to the DC power supply (E) in the primary-side energy emission module, and the AC input terminal of the clamping rectifier (CD) is connected to the clamping compensation capacitor (C). C ) and secondary clamping winding (L CS They are connected in series to form a closed loop.

[0054] The secondary-side energy pickup module is used to receive the energy emitted by the primary-side energy transmitting module and output a resistive load. The secondary-side energy pickup module includes a receiving coil (L... S Secondary compensation capacitor (C) S ), reconfigurable rectifier (RD), controller (K), filter capacitor (C) F The reconfigurable rectifier (RD) consists of a bridge circuit composed of three diodes (D1-D3) and one switching transistor (Q1), where the switching transistor (Q1) forms any one of the lower arms of the bridge circuit. The specific connection relationship of the secondary-side energy pickup module is as follows: the DC output terminal of the reconfigurable rectifier (RD) is connected to the filter capacitor (C) respectively. F The load (R) is connected in parallel, and the AC input terminal of the reconfigurable rectifier (RD) is connected to the secondary compensation capacitor (C). S ), receiving coil (L) S The series circuits form a closed loop, and the control terminal of the switching transistor (Q1) in the reconfigured rectifier (RD) is connected to the controller (K).

[0055] Furthermore, the system operating frequency is defined as ω, and the system allows the transmitting coil (L) to operate at a frequency of ω. P ) and receiving coil (L S The maximum coupling coefficient between them is k max The system allows the transmitting coil (L) P ) and receiving coil (L S The minimum coupling coefficient between them is k minThe transmitting coil (L) corresponding to the inactive full-bridge mode and the activated full-bridge mode. P ) and receiving coil (L S The critical coupling coefficient is k. cross1 The transmitting coils (L) corresponding to the activated full-bridge mode and the deactivated half-bridge mode. P ) and receiving coil (L S The critical coupling coefficient is k. cross2 The transmitting coil (L) corresponding to the inactive half-bridge mode and the active half-bridge mode. P ) and receiving coil (L S The critical coupling coefficient is k. cross3 The maximum allowable output power of the system is P. max The minimum allowable output power of the system is P. min The system allows fluctuations of β, and the transmitting coil (L) P The inductance value is Receiver coil (L) S The inductance value is Primary clamping winding (L) CP The inductance value is Secondary clamping winding (L) CS The inductance value is The secondary compensation capacitor (C) S capacitance value Determined by equation (25):

[0056]

[0057] The primary compensation capacitor (C) P capacitance value Determined by equation (26):

[0058]

[0059] The clamping compensation capacitor (C) C capacitance value Determined by equation (27):

[0060]

[0061] The primary clamping winding (L) CP ) and secondary clamping winding (L CS Mutual induction between (M) C mutual inductance value Determined by equation (28):

[0062]

[0063] The resistance value of the resistive load (R) Determined by equation (29):

[0064]

[0065] The voltage value of the DC power supply (E) Determined by equation (30):

[0066]

[0067] The system described allows the transmitting coil (L) P ) and receiving coil (L S The minimum coupling coefficient k between) min Determined by equation (31):

[0068]

[0069] The system described refers to the transmitting coils (L) corresponding to the inactive and activated full-bridge modes. P ) and receiving coil (L S The critical coupling coefficient k) corss1 Determined by equation (32):

[0070]

[0071] The system's activated full-bridge mode and the inactive half-bridge mode correspond to the corresponding transmitting coils (L) P ) and receiving coil (L S The critical coupling coefficient is k. cross2 Determined by equation (33):

[0072]

[0073] The system described refers to the transmitting coil (L) corresponding to the inactive half-bridge mode and the activated half-bridge mode. P ) and receiving coil (L S The critical coupling coefficient is k. cross3 Determined by equation (34):

[0074]

[0075] The minimum allowable output power P of the system min Determined by equation (35):

[0076]

[0077] The allowable fluctuation β of the system is determined by equation (36):

[0078]

[0079] Furthermore, the system has four operating modes: inactive full-bridge mode, activated full-bridge mode, inactive half-bridge mode, and activated half-bridge mode. In the inactive full-bridge mode, the clamping rectifier is not operating, the primary-side clamping module does not recover some of the energy emitted from the primary side to the DC power supply (E), and the switching transistor (Q) in the reconfigurable rectifier is not turned on; the reconfigurable rectifier operates in a full-bridge circuit. In the activated full-bridge mode, the clamping rectifier is operating, the primary-side clamping module recovers some of the energy emitted from the primary side to the DC power supply (E), and the switching transistor (Q) in the reconfigurable rectifier is turned on; the reconfigurable rectifier operates in a half-bridge circuit. In the inactive half-bridge mode, the clamping rectifier is not operating, the primary-side clamping module does not recover some of the energy emitted from the primary side to the DC power supply (E), and the switching transistor (Q) in the reconfigurable rectifier is not turned on; the reconfigurable rectifier operates in a full-bridge circuit. The activated half-bridge mode is when the clamping rectifier in the system operates, and the primary-side clamping module recovers part of the energy emitted from the primary side back to the DC power supply (E); the switching transistor (Q) in the reconfiguration rectifier is turned on, and the reconfiguration rectifier operates in a half-bridge circuit. When the transmitting coil (L) P ) and receiving coil (L S The coupling coefficient (k) between the two modes is less than that between the transmitting coils (L) corresponding to the activated full-bridge mode and the inactive half-bridge mode of the system. P ) and receiving coil (L S The critical coupling coefficient is k. cross2 When the controller (K) turns on the switching transistor (Q) in the reconfigurable rectifier, the reconfigurable rectifier operates in a half-bridge circuit; when the transmitting coil (L) turns on... P ) and receiving coil (L S The coupling coefficient (k) between the two modes is greater than that between the transmitting coils (L) corresponding to the activated full-bridge mode and the inactive half-bridge mode of the system. P ) and receiving coil (L S The critical coupling coefficient is k. cross2 When the controller (K) turns off the switching transistor (Q) in the reconfigurable rectifier, the reconfigurable rectifier operates in a full-bridge circuit; when the transmitting coil (L)... P ) and receiving coil (L S The coupling coefficient (k) between the two modes is equal to the coupling coefficient (L) between the corresponding transmitting coils of the activated full-bridge mode and the inactive half-bridge mode. P ) and receiving coil (L S The critical coupling coefficient is k. cross2 When the controller (K) is in the on or off state, the switch (Q) in the reconfigurable rectifier will be turned on or off. At this time, the reconfigurable rectifier will operate in a full-bridge or half-bridge circuit.

[0080] The working principle of this invention is as follows:

[0081] Define the primary compensation capacitor (C) PThe capacitance value is Primary clamping winding (L) CP Inductance value Transmitting coil (L) P The inductance value and the equivalent series resistance of the primary-side energy emission module circuit are r. P The magnitude of the primary-side energy emission module circuit current is I. P ;

[0082] Clamping compensation capacitor (C) C The capacitance value is Secondary clamping winding (L) CS Inductance value The equivalent internal resistance of the circuit loop and the equivalent series internal resistance of the primary clamping module circuit are r. C The magnitude of the current in the primary clamping module circuit is I. C ;

[0083] Receiver coil (L) S Inductance value Secondary compensation capacitor (C) S Capacitance value The equivalent series resistance of the secondary energy pickup module circuit is r. S The magnitude of the current in the secondary energy pickup module circuit is I. S ;

[0084] Transmitting coil (L) P ) and receiving coil (L S The coupling coefficient between the two coils is k, and the system allows the transmitting coil (L) to... P ) and receiving coil (L S The maximum coupling coefficient between them is k max The system allows the transmitting coil (L) P ) and receiving coil (L S The minimum coupling coefficient between them is k min The transmitting coils (L) corresponding to the inactive full-bridge mode and the activated full-bridge mode. P ) and receiving coil (L S The critical coupling coefficient is k. cross1 The transmitting coils (L) corresponding to the activated full-bridge mode and the deactivated half-bridge mode. P ) and receiving coil (L S The critical coupling coefficient is k. cross2 The transmitting coil (L) corresponding to the inactive half-bridge mode and the activated half-bridge mode. P ) and receiving coil (L S The critical coupling coefficient is k. cross3 ;

[0085] Primary clamping winding (L) CP) and secondary clamping winding (L CS Mutual induction between (M) C mutual inductance value

[0086] The system efficiency without activating the full-bridge mode is: When the full-bridge mode is activated The system efficiency without activating the half-bridge mode is: The system efficiency for activating the half-bridge mode is:

[0087] The system operates at frequency ω, the DC voltage source E has a magnitude of E, and the output voltage of the high-frequency inverter (H) has a magnitude of U. P The load R is R, and the equivalent AC load on the input side of the clamping rectifier (CD) is R. eqc The equivalent AC load on the input side of the reconfigurable rectifier (RD) when operating in a full-bridge circuit is R. acfull The equivalent AC load on the input side of the reconfigurable rectifier (RD) operating in a half-bridge circuit is R. achalf The input voltage of the clamping rectifier (CD) is U. C The maximum allowable output power of the system is P. max The minimum permissible output power is P. min The power fluctuation of the system is β.

[0088] The DC voltage source E and the output voltage U of the high-frequency inverter (H) P The relationship is as follows:

[0089]

[0090] The load R and the equivalent AC load R on the input side of the reconfigurable rectifier (RD) when operating in a full-bridge circuit. acfull The relationship is as follows:

[0091]

[0092] The load R and the equivalent AC load R on the input side of the reconfigurable rectifier (RD) when it operates in a half-bridge circuit. achalf The relationship is as follows:

[0093]

[0094] System power fluctuation (β), maximum allowable output power (P) max ) and the maximum permissible output power (P) min The relationship is as follows:

[0095]

[0096] Receiver coil (L) S ) and secondary compensation capacitor (C S The following conditions must be met.

[0097]

[0098] Assuming the system operating frequency ω, and the system's allowable transmitting coil (L) P ) and receiving coil (L S The maximum coupling coefficient between them is k max The maximum allowable output power of the system is P. max These are pre-defined known quantities.

[0099] like Figure 2 The figure shows the equivalent circuit of the system operating in the unactivated full-bridge mode, where the equivalent series resistance of the primary-side energy emission module circuit is defined as r. P The equivalent series resistance of the secondary energy pickup module circuit is r. S Using the mesh current method to... Figure 2 Analyze the circuit shown and write the following equations:

[0100]

[0101] At this point, the system efficiency is adopted. By representing and solving the above formula (42), the system efficiency can be obtained. for

[0102]

[0103] The system efficiency (η1) is equal to the equivalent AC load (R). acfull The function of ), i.e. η(R) acfull Furthermore, by taking the derivative of this function and setting it to zero, we can obtain the optimal load (R) corresponding to the system's optimal efficiency. acfullop1 ),Right now

[0104]

[0105] Let the equivalent series resistance of the primary-side energy emission module circuit be equal to the equivalent series resistance of the primary-side clamping module circuit (R). P =R S ),and We can then obtain:

[0106]

[0107] Furthermore, since the system's internal resistance is too small to be ignored, the system output power is expressed as P. o1 By expressing this, the output power (P) can be obtained by solving formula (42). o1 The expression is

[0108]

[0109] From the above formula (46), it can be seen that it is a function of the coupling coefficient (k). By taking the derivative of this function and setting it to zero, the coupling coefficient (k) corresponding to the maximum power of the system can be obtained. pmax1 ),Right now

[0110]

[0111] Substituting formula (47) into (46), we can obtain the maximum output power of the system (P). max ),Right now

[0112]

[0113] To ensure the system has the maximum offset range, the system allows the transmitting coil (L) to... P ) and receiving coil (L S The maximum coupling coefficient (k) between ) max ) and the corresponding transmitting coils (L) between the inactive full-bridge mode and the activated full-bridge mode. P ) and receiving coil (L S The critical coupling coefficient (k) cross1 The output power corresponding to ) is the minimum allowable output power of the system (P). min Solving by combining equations (28) and (34) simultaneously yields the system's permissible transmitting coil (L). P ) and receiving coil (L S The maximum coupling coefficient (k) between ) max ) and the corresponding transmitting coils (L) between the inactive full-bridge mode and the activated full-bridge mode. P ) and receiving coil (L S The critical coupling coefficient (k) cross1 ),Right now

[0114]

[0115] United Figure 1 Although the primary-side clamping circuit is not working when the full-bridge mode is not activated, a voltage (U) will still exist at the input of the primary-side clamping rectifier (CD) due to electromagnetic induction. C Its size is similar to that of the secondary clamping winding (L). CS The induced electromotive force obtained in ) is equal to that obtained in )

[0116]

[0117] From formula (38), it can be seen that as the coupling coefficient (k) increases, the input voltage (U) of the primary-side clamp rectifier (CD) also increases. CThe coupling coefficient (k) will increase when it decreases to the level of the transmitting coil (L) corresponding to the inactive full-bridge mode and the activated full-bridge mode. P ) and receiving coil (L S The critical coupling coefficient (k) cross1 When ), the input voltage (U) of the primary-side clamp rectifier (CD) C The current will exceed the DC power supply (E), causing the clamping rectifier to be activated, enabling the system to adaptively enter the activated full-bridge mode.

[0118] like Figure 3 The diagram shows the equivalent circuit of the system operating in the activated full-bridge mode, where the equivalent series resistance of the primary-side clamping module circuit is defined as r. C .

[0119] In this mode, due to the clamping effect of the DC power supply (E), the magnitude of the input voltage between the DC voltage source (E) and the clamping rectifier (CD) is U. C The relationship is as follows:

[0120]

[0121] Using mesh current method to Figure 3 Analyze the circuit shown and write the following equations:

[0122]

[0123] At this point, the system efficiency is adopted. By representing and solving the above formula (52), the system efficiency can be obtained. for

[0124]

[0125] Similarly, the system efficiency (η2) is equal to the equivalent AC load (R). acfull The function of ), i.e. η(R) acfull Furthermore, by taking the derivative of this function and setting it to zero, we can obtain the optimal load (R) corresponding to the system's optimal efficiency. acfullop2 ),Right now

[0126]

[0127] Similarly, since the system's internal resistance is too small to be ignored, the system output power is taken as P. o2 The output power (P) can be obtained by solving formula (52). o2 The expression is

[0128]

[0129] From the above formula (55), it can be seen that it is a function of the coupling coefficient (k). By taking the derivative of this function and setting it to zero, the coupling coefficient (k) corresponding to the maximum power of the system can be obtained. pmax2 ),Right now

[0130]

[0131] Substituting formula (56) into (55), we can obtain the maximum output power of the system (P). max ),Right now

[0132]

[0133] Similarly, to ensure the system has the maximum offset range, the corresponding transmitting coils (L) between the inactive full-bridge mode and the active full-bridge mode... P ) and receiving coil (L S The critical coupling coefficient (k) cross1 ) and the corresponding transmitting coils (L) between the activated full-bridge mode and the inactive half-bridge mode. P ) and receiving coil (L S The critical coupling coefficient (k) cross2 The output power corresponding to ) is the minimum allowable output power of the system (P). min Solving equations (40) and (55) simultaneously yields the corresponding transmitting coils (L) for the inactive and activated full-bridge modes of the system. P ) and receiving coil (L S The critical coupling coefficient (k) cross1 ) and the corresponding transmitting coils (L) between the activated full-bridge mode and the inactive half-bridge mode. P ) and receiving coil (L S The critical coupling coefficient (k) cross2 ),Right now

[0134]

[0135] When the coupling coefficient (k) is further reduced to the level corresponding to the transmitting coil (L) between the activated full-bridge mode and the inactive half-bridge mode... P ) and receiving coil (L S The critical coupling coefficient (k) cross2 When the controller (K) turns on the switch (Q) in the reconfigurable rectifier, the reconfigurable rectifier (RD) operates in a half-bridge circuit. Substituting equation (39) into equation (38), we can obtain the input voltage (U) of the primary-side clamping rectifier (CD) of the reconfigurable rectifier (RD) in the half-bridge circuit. C ),Right now

[0136]

[0137] From equations (39) and (59), the decrease in load (R) will lead to a decrease in the input voltage (U) of the primary-side clamp rectifier (CD). C The increase of ) . From equations (38) and (39), it can be seen that the equivalent AC load (R) on the input side when the reconfigured rectifier (RD) operates in a half-bridge circuit. achalf Compared to the load R and the equivalent AC load (R) on the input side when the reconfigured rectifier (RD) operates in a half-bridge circuit, acfull The voltage was reduced by a factor of 4, resulting in a decrease in the input voltage (U) of the primary-side clamp rectifier (CD). C The voltage drops below the DC power supply (E) again, so that the clamping rectifier cannot be activated and the system enters the inactive half-bridge mode.

[0138] like Figure 3 The diagram shows the equivalent circuit of the system operating in the inactive half-bridge mode. Since the equivalent circuit in this mode is similar to that in the inactive full-bridge mode, the analysis method used in the inactive full-bridge mode can be applied to obtain the optimal load (R0) corresponding to the optimal efficiency of the system in the inactive half-bridge mode. acfullop3 )for

[0139]

[0140] The coupling coefficient (k) corresponding to the maximum power of the system pmax3 )for

[0141]

[0142] Maximum output power of the system (P) max )for

[0143]

[0144] The transmitting coil (L) corresponding to the activated full-bridge mode and the deactivated half-bridge mode of the system. P ) and receiving coil (L S The critical coupling coefficient (k) cross2 The transmitting coils (L) corresponding to the inactive half-bridge mode and the activated full-bridge mode. P ) and receiving coil (L S The critical coupling coefficient (k) cross3 )for

[0145]

[0146] From formula (47), when the coupling coefficient (k) decreases to the level of the transmitting coil (L) corresponding to the inactive half-bridge mode and the active half-bridge mode, P ) and receiving coil (L S The critical coupling coefficient (k) cross3When ), the input voltage (U) of the primary-side clamp rectifier (CD) C The current will exceed the DC power supply (E), causing the clamping rectifier to be activated, enabling the system to adaptively enter the activated half-bridge mode.

[0147] like Figure 4 The diagram shows the equivalent circuit of the system operating in the activated half-bridge mode. Since the equivalent circuit in this mode is similar to that in the activated full-bridge mode, the optimal load (R0) corresponding to the optimal efficiency of the system in the activated half-bridge mode can be obtained by referring to the analysis method used in the activated full-bridge mode. acfullop4 )for

[0148]

[0149] The coupling coefficient (k) corresponding to the maximum power of the system pmax4 )for

[0150]

[0151] Maximum output power of the system (P) max )for

[0152]

[0153] The transmitting coil (L) corresponding to the inactive half-bridge mode and the activated full-bridge mode of the system. P ) and receiving coil (L S The critical coupling coefficient (k) cross3 ) and the system allows the transmitting coil (L P ) and receiving coil (L S The minimum coupling coefficient between them is k min for

[0154]

[0155] Based on the above analysis, it can be found from formulas (45), (54), (60), and (64) that as the coupling coefficient (k) decreases, the optimal load (R) corresponding to the optimal efficiency of the system decreases. acfullop1 The equivalent AC load (R) will also decrease. ac With a fixed coupling coefficient (k), changes in the coupling coefficient (k) will affect the optimal load (R) corresponding to the system's optimal efficiency. acfullop1 It will be unable to be compared with the AC equivalent load (R) ac Matching. Under the action of the reconfigurable rectifier bridge, the equivalent AC load (R0) on the input side of the reconfigurable rectifier (RD) when operating in a half-bridge circuit is matched. achalf The equivalent AC load (R) on the input side of the reconfigurable rectifier (RD) when it operates in a half-bridge circuit is related to the load R and the reconfigurable rectifier (RD). acfullThe impedance matching is corrected by a factor of four, thus improving system efficiency. The present invention selects the point k, where the coupling coefficient is at its maximum. max The corresponding optimal equivalent load is used as the resistance value of the system load R, thereby improving the system transmission efficiency, that is:

[0156]

[0157] Furthermore, to ensure that the system has the same power fluctuation in both the inactive and activated full-bridge modes, it is necessary to achieve uniformity in the maximum and minimum power of the system in both modes. Therefore, by simultaneously solving equations (48), (49), (57), (58), (62), (63), (66), and (67), we can obtain the following results.

[0158] Secondary compensation capacitor (C) S capacitance value for

[0159]

[0160] Primary compensation capacitor (C) P capacitance value for

[0161]

[0162] Clamping compensation capacitor (C) C capacitance value for

[0163]

[0164] Clamping winding (L) CP ) and secondary clamping winding (L CS Mutual induction between (M) C mutual inductance value for

[0165]

[0166] The voltage value of the DC power supply (E) for

[0167]

[0168] The system allows the transmitting coil (L) P ) and receiving coil (L S The minimum coupling coefficient k between) min The relationship is

[0169]

[0170] The transmitting coil (L) corresponding to the inactive and activated full-bridge modes of the system. P ) and receiving coil (L S The critical coupling coefficient k) corss1 The relationship is

[0171]

[0172] The transmitting coil (L) corresponding to the activated full-bridge mode and the deactivated half-bridge mode of the system. P ) and receiving coil (L S The critical coupling coefficient is k. cross2 The relationship is

[0173]

[0174] The transmitting coil (L) corresponding to the inactive half-bridge mode and the active half-bridge mode of the system. P ) and receiving coil (L S The critical coupling coefficient is k. cross3 The relationship is

[0175]

[0176] The minimum allowable output power P of the system min for

[0177]

[0178] The system's allowable fluctuation β is

[0179]

[0180] Combining the above analysis, the system transmission power can be described as follows: Figure 6 As shown.

[0181] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A high-offset-resistance wireless power transfer system based on clamping and reconfiguration rectifiers, characterized in that: It includes a primary-side energy emission module, a primary-side clamping module, and a secondary-side energy pickup module; The primary-side energy transmitting module is used to transmit the DC power supply output energy to the primary-side clamping module and the secondary-side energy pickup module. The primary-side energy transmitting module includes a DC power supply (E), a high-frequency inverter (H), and a primary compensation capacitor (C). P ), primary clamping winding (L) CP ) and transmitting coil (L P ); The primary-side clamping module is used to adaptively recover a portion of the energy emitted from the primary side back to the DC power supply. The primary-side clamping module includes a clamping rectifier (CD) and a clamping compensation capacitor (C). C ) and secondary clamping winding (L CS ); The secondary-side energy pickup module is used to receive the energy emitted by the primary-side energy transmitting module and output a resistive load. The secondary-side energy pickup module includes a receiving coil (L... S Secondary compensation capacitor (C) S ), reconfigurable rectifier (RD), controller (K), filter capacitor (C) F ) and resistive load (R); The methods for setting each system parameter are as follows: The system operating frequency is The system allows the transmitting coil (L) P ) and receiving coil (L S The maximum coupling coefficient between them is k max The system allows the transmitting coil (L) P ) and receiving coil (L S The minimum coupling coefficient between them is k min The transmitting coils (L) corresponding to the inactive full-bridge mode and the activated full-bridge mode. P ) and receiving coil (L S The critical coupling coefficient is k cross1 The transmitting coils (L) corresponding to the activated full-bridge mode and the inactive half-bridge mode. P ) and receiving coil (L S The critical coupling coefficient is k cross2 The transmitting coil (L) corresponding to the inactive half-bridge mode and the active half-bridge mode. P ) and receiving coil (L S The critical coupling coefficient is k cross3 The maximum allowable output power of the system is P max The minimum allowable output power of the system is P min The system allows for fluctuations of... β Transmitting coil (L) P The inductance value is Receiver coil (L) S The inductance value is Primary clamping winding (L) CP The inductance value is Secondary clamping winding (L) CS The inductance value is Secondary compensation capacitor (C) S capacitance value Determined by equation (1): （1）； Primary compensation capacitor (C) P capacitance value Determined by equation (2): （2）； Clamping compensation capacitor (C) C capacitance value Determined by equation (3): （3）； Primary clamping winding (L) CP ) and secondary clamping winding (L CS Mutual induction between (M) C mutual inductance value Determined by equation (4): （4）； The resistance value of the resistive load (R) Determined by equation (5): （5）； The voltage value of the DC power supply (E) Determined by equation (6): （6）； The system allows the transmitting coil (L) P ) and receiving coil (L S Minimum coupling coefficient between k min Determined by equation (7): （7）； The transmitting coils (L) corresponding to the inactive and activated full-bridge modes of the system. P ) and receiving coil (L S Critical coupling coefficient k corss1 Determined by equation (8): （8）； The transmitting coil (L) corresponding to the activated full-bridge mode and the deactivated half-bridge mode of the system. P ) and receiving coil (L S The critical coupling coefficient is k cross2 Determined by equation (9): （9）； The transmitting coil (L) corresponding to the inactive half-bridge mode and the active half-bridge mode of the system. P ) and receiving coil (L S The critical coupling coefficient is k cross3 Determined by equation (10): （10）； Minimum allowable output power of the system P min Determined by equation (11): （11）； System allowable fluctuations β Determined by equation (12): （12）； The system includes four operating modes: inactive full-bridge mode, active full-bridge mode, inactive half-bridge mode, and active half-bridge mode; In the inactive full-bridge mode, the clamping rectifier in the system is not working, and the primary-side clamping module does not recover part of the energy emitted by the primary side to the DC power supply (E); the switching transistor (Q) in the reconfiguration rectifier is not turned on, and the reconfiguration rectifier operates in the full-bridge circuit. The clamping rectifier in the activated full-bridge mode works, and the primary-side clamping module recovers part of the energy emitted by the primary side to the DC power supply (E); the switching transistor (Q) in the reconfiguration rectifier is turned on, and the reconfiguration rectifier works in the half-bridge circuit. In the inactive half-bridge mode, the clamping rectifier in the system is not working, and the primary clamping module does not recover part of the energy emitted by the primary side to the DC power supply (E); the switching transistor (Q) in the reconfiguration rectifier is not turned on, and the reconfiguration rectifier operates in the full-bridge circuit. In the activated half-bridge mode system, the clamping rectifier operates, and the primary-side clamping module recovers part of the energy emitted by the primary side to the DC power supply (E); the switching transistor (Q) in the reconfiguration rectifier is turned on, and the reconfiguration rectifier operates in the half-bridge circuit. When the transmitting coil (L) P ) and receiving coil (L S Coupling coefficients between () k The difference between the activated full-bridge mode and the inactive half-bridge mode is less than the difference between the corresponding transmitting coils (L). P ) and receiving coil (L S The critical coupling coefficient is k cross2 When the controller (K) turns on the switching transistor (Q) in the reconfigurable rectifier, the reconfigurable rectifier operates in a half-bridge circuit; when the transmitting coil (L) turns on... P ) and receiving coil (L S Coupling coefficients between () k The value is greater than the difference between the activated full-bridge mode and the inactive half-bridge mode corresponding to the transmitting coil (L). P ) and receiving coil (L S Critical coupling coefficient k cross2 When the controller (K) turns off the switching transistor (Q) in the reconfigurable rectifier, the reconfigurable rectifier operates in a full-bridge circuit; when the transmitting coil (L)... P ) and receiving coil (L S Coupling coefficients between () k ) equals the transmit coil (L) corresponding to the activated full-bridge mode and the deactivated half-bridge mode of the system. P ) and receiving coil (L S Critical coupling coefficient k cross2 When the controller (K) is in the on or off state, the switch (Q) in the reconfiguration rectifier will be turned on or off. At this time, the reconfiguration rectifier will operate in a full-bridge or half-bridge circuit.

2. The strong offset-resistant wireless power transfer system based on clamping and reconfiguration rectifiers according to claim 1, characterized in that, The positive and negative terminals of the DC power supply (E) are connected to the DC input terminal of the high-frequency inverter (H), respectively, and the AC output terminal of the high-frequency inverter (H) is connected to the primary compensation capacitor (C). P ), transmitting coil (L) P ) and primary clamping winding (L CP The clamping rectifier (CD) is connected in series to form a closed loop; the DC output terminal of the clamping rectifier (CD) is connected to the DC power supply (E) in the primary-side energy emission module, and the AC input terminal of the clamping rectifier (CD) is connected to the clamping compensation capacitor (C). C ) and secondary clamping winding (L CS ) are connected in series to form a closed loop; the DC output terminal of the reconfigured rectifier (RD) is connected to the filter capacitor (C) respectively. F The load (R) is connected in parallel, and the AC input terminal of the reconfigurable rectifier (RD) is connected to the secondary compensation capacitor (C). S ), receiving coil (L) S The control terminal of the switch (Q1) in the reconfigurable rectifier (RD) is connected to the controller (K) to form a closed loop. The reconfigurable rectifier (RD) consists of a bridge circuit composed of three diodes (D1, D2, D3) and one switch (Q1), wherein the switch (Q1) constitutes the lower bridge arm in the bridge circuit.

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