Transmitting side reconstruction multi-mode wireless charging system and method for charging electric bicycle

Abstract

The invention discloses a transmitting side reconfiguration multi-mode wireless charging system and method for charging an electric bicycle, relates to the field of wireless charging of electric bicycles, and aims to solve the problems that in the prior art, elements are many, the size is large, and constant-current constant-voltage multi-mode output cannot be achieved. All compensation elements and a control circuit are concentrated at a fixed transmitting end, a compensation capacitor is connected in series at a receiving side, and a transmitting side circuit can be reconstructed by controlling a switch of a transmitting side MOS (Metal Oxide Semiconductor) tube, so that multi-mode constant output of different specifications is realized, and the system works at a fixed frequency, and the system has high reliability. The problem that the system stability is low due to the frequency bifurcation phenomenon is avoided, the lightweight design of the system is met, and the engineering adaptability and long-term operation reliability of the system in scenes such as portable electronic equipment and electric bicycle charging piles are remarkably improved.

Description

Technical Field

[0001] This invention relates to the field of wireless charging technology for electric bicycles, specifically to a transmitter-side reconfiguration multi-mode wireless charging system and method for charging electric bicycles. Background Technology

[0002] Different models of electric bicycles generally have different battery specifications, therefore, traditional wireless charging devices cannot charge different models of electric bicycles. To improve the universality of electric bicycle charging systems, a wireless power transfer system with multi-mode output is needed. Currently, the following methods are mainly used to achieve constant current and constant voltage output of different specifications in a single charging device:

[0003] Multi-output channel technology: In wireless power transmission systems, multiple transmitters and receivers are used to achieve multiple output specifications. This method requires additional energy channels and a large number of compensation components, which greatly increases the cost and size of the system.

[0004] Reconfigurable rectifier technology: This method requires adding additional rectifier modules and related components on the receiving side, which violates the requirement for lightweight design on the receiving side in wireless power transmission systems;

[0005] DC-DC auxiliary technology: This method requires the addition of an extra DC-DC converter, which will take up a considerable amount of vehicle space, increase weight and wear and tear;

[0006] Variable frequency control technology: This method makes it difficult for the system to operate under zero phase angle conditions, which leads to reactive power circulation, causing huge losses, and there is an unavoidable frequency bifurcation phenomenon, which further affects the performance of the system.

[0007] Chinese patent CN120222648A discloses a reconfigurable integrated four constant voltage output wireless power transmission system. The technical solution it employs includes a transmitting module and a receiving module; the transmitting module is a field-effect transistor. - A field-effect transistor is formed by connecting the components sequentially. , , Field-effect transistors connected in series The other end is connected to a DC power supply. Positive terminal, DC power supply Negative terminal connected field-effect transistor One end, field-effect transistor One end is connected to the field-effect transistor , Between, field-effect transistors The other end is connected to the compensation capacitor. One end is connected, and a compensation capacitor is connected The other end is connected through a resistor With the transmitting side coil One end is connected, and the transmitting side coil is connected The other end is connected to the field effect transistor , Between; the compensation capacitor One end is connected to the DC power supply Negative, compensation capacitor The other end is connected to the transmitting side coil One end is connected, and the transmitting side coil is connected The other end is connected through a resistor Connected to the transmitting side coil One end; the compensation capacitor One end is connected to the field effect transistor , field effect transistor The other end is connected to the DC power supply Negative, compensation capacitor The other end is connected to the transmitting side coil And the common end of the compensation capacitor .

[0008] The existing patent realizes the output of four constant voltage modes through the conduction mode of the hole to the field effect tube, but it is only limited to constant voltage output and cannot realize constant current output. SUMMARY

[0009] The technical problem to be solved by the present application is to overcome the existing defects and provide a transmitting side reconstruction multi-mode wireless charging system and method for electric bicycle charging, which can effectively solve the problems in the background art.

[0010] In order to achieve the above purpose, the present application discloses a transmitting side reconstruction multi-mode wireless charging system for electric bicycle charging, which adopts the technical scheme of comprising a transmitting end inverter module, a resonant coupling transmission module and a receiving end rectifier module, the resonant coupling transmission module is connected with the transmitting end inverter module and the receiving end rectifier module, the transmitting end inverter module comprises a power supply And a MOS tube The positive electrode of the power supply Is connected to the drain of the MOS tube , the source of the MOS tube Is connected in parallel with the source of the MOS tube , the drain of the MOS tube Is connected with the source of the MOS tube , and the source of the MOS tube The drain of the MOS tube The drain of the MOS tube And the capacitor , capacitor and capacitor back-end connection transmitting coil , transmitting coil back-end parallel transmitting coil , MOS tube of transmitting end inverter module source and MOS tube drain; transmitting coil back-end parallel capacitor and capacitor , capacitor back-end connection MOS tube of transmitting end inverter module source, capacitor back-end parallel MOS tube of transmitting end inverter module source, MOS tube drain and power supply negative electrode; the resonant coupling transmission module further comprises a receiving coil , receiving coil connecting the receiving compensation network to the receiving end rectification module; the transmitting coil , the transmitting coil , the receiving coil are mutually inductive. By changing the on-off state of the MOS tube , a constant current mode and two constant voltage modes can be realized, and the compensation elements are few, the cost is low, the volume is small, and the lightweight demand is met.

[0011] As a preferred technical solution of the present application, the receiving compensation network comprises a capacitor , the capacitor , the receiving coil , the receiving end rectification module is connected in series. All compensation elements and control circuits are concentrated in the fixed transmitting end, only one series compensation capacitor is reserved on the receiving side, which meets the lightweight design of the system, and significantly improves the engineering adaptability and long-term operation reliability of the system in the mobile scenario.

[0012] As a preferred technical solution of the present application, the receiving end rectification module comprises a full-bridge rectification circuit, a filter capacitor and a battery equivalent load , the full-bridge rectification circuit is connected in parallel with the filter capacitor and the battery equivalent load , the full-bridge rectification circuit and the capacitor , the receiving coil are connected.

[0013] As a preferred technical solution of the present application, the capacitor and the capacitor Together they form a resonant capacitor The capacitor and the capacitor Together they form a topological capacitor ;

[0014] Each resonant circuit satisfies the following conditions:

[0015]

[0016] in, Angular frequency, For transmitting coil and transmitting coil Mutual intuition between them For transmitting coil and receiving coil Mutual intuition between them transmitting coil and receiving coil Mutual attraction between them.

[0017] As a preferred embodiment of the present invention, the angular frequency satisfy ,in For frequency.

[0018] This invention also discloses a charging method based on the above-mentioned transmitter-side reconfigurable multi-mode wireless charging system. The technical solution adopted is that, when constant current mode output is required, the MOS transistor of the transmitter-side reconfigurable multi-mode wireless charging system... MOSFET remains on MOSFET and MOSFET The circuit remains off; at this time, the transmitting coil... The resonant circuit in question is not connected to the circuit; MOSFET and MOSFET Together they form a half-bridge inverter circuit and alternately conduct with a 50% duty cycle;

[0019] When operating in the first constant voltage mode, the MOSFET of the transmitter-side reconfiguration multi-mode wireless charging system MOSFET and MOSFET MOSFET remains on The transmitter capacitor remains off. The resonant circuit in question is not connected to the circuit; MOSFET and MOSFET Together they form a half-bridge inverter circuit and alternately conduct with a 50% duty cycle;

[0020] When operating in the second constant voltage mode, the MOSFET of the transmitter-side reconfiguration multi-mode wireless charging system MOSFET and MOSFET Set to continuous conduction, MOSFET The transmitter capacitor remains off. The resonant circuit in question is not connected to the circuit; MOSFET and MOSFET Together they form a half-bridge inverter circuit and alternately conduct with a 50% duty cycle.

[0021] As a preferred embodiment of the present invention, the capacitor and the capacitor Together they form a resonant capacitor The capacitor and the capacitor Together they form a topological capacitor ;

[0022] Each resonant circuit satisfies the following conditions:

[0023]

[0024] in, Angular frequency, For transmitting coil and transmitting coil Mutual intuition between them For transmitting coil and receiving coil Mutual intuition between them transmitting coil and receiving coil Mutual inductance between them; the angular frequency satisfy ,in For frequency.

[0025] As a preferred embodiment of the present invention, in constant current mode output, the transmitter side reconstructs the constant output current of the multi-mode wireless charging system. and input impedance It is represented as:

[0026]

[0027] As can be seen from the above formula, this transmitter-side reconfigurable multi-mode wireless charging system can achieve constant current output and corresponding zero-phase angle operation independent of the load in constant current mode.

[0028] When operating in the first constant voltage mode, the transmitter side reconfigures the first voltage output specification of the multi-mode wireless charging system. and input impedance It is represented as:

[0029]

[0030] When operating in the second constant voltage mode, the transmitter side reconfigures the second voltage output specification of the multi-mode wireless charging system. and input impedance It is represented as:

[0031]

[0032] As can be seen from the above formula, this transmitter-side reconfigurable multi-mode wireless charging system can achieve constant voltage output and corresponding zero-phase angle operation independent of the load in constant voltage mode.

[0033] Compared with existing technologies, the advantages of this invention are as follows: By setting multiple MOSFETs and a compensation network on the transmitting side, and connecting a compensation capacitor in series on the receiving side, the transmitting-side circuit can be reconstructed by controlling the switching of the transmitting-side MOSFETs. This enables constant output with different specifications in multiple modes, and the system operates at a fixed frequency, avoiding the low system stability problem caused by frequency bifurcation. By concentrating all compensation components and control circuits at a fixed transmitting end, and retaining only a single series compensation capacitor on the receiving side of the electric bicycle, the system achieves lightweight design, significantly improving its engineering adaptability and long-term operational reliability in scenarios such as portable electronic devices and electric bicycle charging stations.

[0034] Furthermore, this invention can operate under zero phase angle conditions in both constant current mode and constant voltage modes of different specifications, thus reducing reactive circulating current and improving system efficiency. Attached Figure Description

[0035] Figure 1 This is a system architecture diagram of the present invention;

[0036] Figure 2 This is the system architecture diagram corresponding to the constant current mode of this invention;

[0037] Figure 3 This is the equivalent circuit diagram corresponding to the constant current mode of this invention;

[0038] Figure 4 This is a system architecture diagram corresponding to the first constant voltage mode of the present invention;

[0039] Figure 5 This is the equivalent circuit diagram corresponding to the first constant voltage mode of the present invention;

[0040] Figure 6 This is the system architecture diagram corresponding to the second constant voltage mode of the present invention;

[0041] Figure 7 This is the equivalent circuit diagram corresponding to the second constant voltage mode of the present invention. Detailed Implementation

[0042] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0043] Example 1

[0044] like Figure 1 As shown, this invention discloses a transmitter-side reconfigurable multi-mode wireless charging system for electric bicycle charging. The technical solution includes a transmitter-side inverter module (DC-AC module), a resonant coupling transmission module (AC-AC module), and a receiver-side rectifier module (AC-DC module). The transmitter-side inverter module includes a power supply. ,power supply Positive terminal connected to MOSFET Drain, MOSFET Source parallel MOSFET Source, MOSFET Drain and MOSFET Source, MOSFET Drain and MOSFET The drains are connected to capacitors respectively. and capacitor front end, capacitor and capacitor Together they form a resonant capacitor ,capacitance and capacitor Rear end connection to transmitting coil transmitting coil Parallel transmitting coil at the rear end MOSFET Source and MOSFET Drain; transmitting coil Parallel capacitor at the back end and capacitor ,capacitance Back-end connection MOSFET Source, capacitor Back-end parallel MOSFET Source, MOSFET Drain and power supply Negative electrode; the resonant coupling transmission module also includes a receiving coil. Receiving coil Connecting capacitors The receiver is then connected to a rectifier module; the receiver rectifier module includes a full-bridge rectifier circuit and filter capacitors. Battery equivalent load The full-bridge rectifier circuit includes diodes. Among them, diodes and diodes Series connection, diode and diodes Series connection, diode ,diode With diode ,diode They are connected in parallel to form a full-bridge rectifier circuit, with capacitors... One end is connected to the diode anode, receiving coil One end is connected to the diode cathode, diode anode and diode The rectifier input voltage is formed between the cathodes, and the full-bridge rectifier circuit and filter capacitor... Battery equivalent load Parallel connection, transmitting coil , transmitting coil Receiver coil They sense each other.

[0045] Battery equivalent load The input AC equivalent resistance of the rectifier (i.e., the full-bridge rectifier circuit) The mathematical expression is:

[0046]

[0047] The root mean square value of the phasor and the input DC voltage source The mathematical relationship between them and the root mean square value of the rectifier input voltage phasor With load voltage The mathematical relationship between them is expressed as follows:

[0048]

[0049] This invention also discloses a charging method based on the above-mentioned transmitter-side reconfigurable multi-mode wireless charging system. The technical solution adopted is that, when constant current mode output is required, the MOS transistor of the transmitter-side reconfigurable multi-mode wireless charging system... MOSFET remains on MOSFET and MOSFET The circuit remains off; at this time, the transmitting coil... The resonant circuit in question is not connected to the circuit; MOSFET and MOSFET Together they form a half-bridge inverter circuit and alternately conduct with a 50% duty cycle;

[0050] When operating in the first constant voltage mode, the MOSFET of the transmitter-side reconfiguration multi-mode wireless charging system MOSFET and MOSFET MOSFET remains on When continuously turned off, the transmitter-side capacitor... The resonant circuit in question is not connected to the circuit; MOSFET and MOSFET Together they form a half-bridge inverter circuit and alternately conduct with a 50% duty cycle;

[0051] When operating in the second constant voltage mode, the MOSFET of the transmitter-side reconfiguration multi-mode wireless charging system MOSFET and MOSFET Set to continuous conduction, MOSFET When continuously turned off, the transmitter-side capacitor... The resonant circuit in question is not connected to the circuit; MOSFET and MOSFET Together they form a half-bridge inverter circuit and alternately conduct with a 50% duty cycle.

[0052] The control logic of the reconfigurable inverter circuit is shown in Table I.

[0053] Table I. Control Logic of the Novel Reconfigurable Inverter Circuit

[0054]

[0055] Constant current mode:

[0056] The system architecture diagram and equivalent circuit diagram in constant current mode are as follows: Figure 2 , Figure 3 As shown, to simplify the analysis, the impedance of the system can be defined as:

[0057]

[0058] Battery equivalent load rectifier input current phasor RMS value and charging current The mathematical expression between them can be represented as:

[0059]

[0060] according to Figure 3 Based on the equivalent circuit and Kirchhoff's voltage law, the following relationship expression can be derived:

[0061]

[0062] To ensure the system can have constant current output characteristics and zero phase angle operation, the following resonance condition should be met:

[0063]

[0064] Substituting the resonance condition of the system operation in equation (6) into the equation of equation (5), and combining equations (1), (2) and (4), the output current is... and input impedance Z in It can be represented as:

[0065]

[0066] As can be seen from equation (6), the proposed transmitter-side reconfiguration multi-mode wireless charging system for electric bicycle charging can achieve constant current output and corresponding zero-phase angle operation independent of the load in constant current mode.

[0067] Constant pressure mode I:

[0068] Figure 4 and Figure 5 The system architecture diagram and equivalent circuit diagram of the proposed transmitter-side reconfigurable multi-mode wireless charging system for electric bicycle charging are shown in the first constant voltage mode.

[0069] according to Figure 5 Based on the equivalent circuit and Kirchhoff's voltage law, the following relationship expression can be derived:

[0070]

[0071] From equation (8), we can obtain the current phasor of the system. and voltage phasor It is represented as:

[0072]

[0073] The detailed expressions for A and B are as follows:

[0074]

[0075] As can be seen, in order for the system to achieve a voltage output independent of the load, A=0 must be satisfied, that is:

[0076]

[0077] Furthermore, in order to reduce the reactive circulating current of the system, zero-phase-angle operation is required, i.e., input impedance... It is purely resistive. Calculated as:

[0078]

[0079] As can be seen from equation (12), Z2=0 is required to achieve zero-phase angle operation. Combining the conditions required to achieve constant voltage in equation (11), the resonance condition that the system needs to satisfy to achieve constant voltage output under zero-phase angle conditions can be derived as follows:

[0080]

[0081] Resonant capacitor It can be calculated as:

[0082]

[0083] Substituting the conditions of equations (1), (2), and (13) into equation (8), the output voltage of the system in the first constant voltage mode is... and input impedance It can be calculated as:

[0084]

[0085] As can be seen from equation (15), the proposed transmitter-side reconfiguration multi-mode wireless charging system for electric bicycle charging can achieve constant voltage output and zero phase angle operation independent of load in the first constant voltage mode.

[0086] Constant pressure mode II:

[0087] Figure 6 and Figure 7 The system architecture diagram and equivalent circuit diagram of the proposed transmitter-side reconfigurable multi-mode wireless charging system for electric bicycles operating in the second voltage mode are shown.

[0088] according to Figure 7 Based on the equivalent circuit and Kirchhoff's voltage law, the following relationship expression can be derived:

[0089]

[0090] Similar to the first constant voltage mode, from equation (16), the current phasor of the system can be obtained. and voltage phasor It is represented as:

[0091]

[0092] The detailed expressions for A and B are as follows:

[0093]

[0094] As can be seen, in order for the system to achieve a voltage output independent of the load, A=0 must be satisfied, that is:

[0095]

[0096] Furthermore, in order to reduce the reactive circulating current of the system, zero-phase-angle operation is required, i.e., input impedance... It is purely resistive. Calculated as:

[0097]

[0098] As can be seen from equation (20), Z1=0 is required to achieve zero-phase angle operation. Combining the conditions required to achieve constant voltage in equation (19), the resonance condition that the system needs to satisfy to achieve constant voltage output under zero-phase angle conditions can be derived as follows:

[0099]

[0100] Topological capacitors It can be calculated as:

[0101]

[0102] Substituting the conditions of equations (1), (2), and (21) into equation (16), the output voltage of the system in the second constant voltage mode is... and input impedance It can be calculated as:

[0103]

[0104] As can be seen from equation (23), the proposed transmitter-side reconfiguration multi-mode wireless charging system for electric bicycle charging can achieve constant voltage output and zero phase angle operation independent of load in the second constant voltage mode.

[0105] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A transmitter-side reconfigurable multi-mode wireless charging system for electric bicycle charging, comprising a transmitter-side inverter module, a resonant coupling transmission module, and a receiver-side rectifier module, wherein the resonant coupling transmission module is connected to the transmitter-side inverter module and the receiver-side rectifier module, characterized in that: The transmitter inverter module includes a power supply. and MOSFET The power supply Positive terminal connected to MOSFET Drain, the MOS transistor Source parallel MOSFET Source, MOSFET Drain and MOSFET Source, the MOS transistor Drain and the MOS transistor The drains of the capacitors are respectively connected to the resonant coupling transmission module. and capacitors capacitor and capacitors Rear end connection to transmitting coil transmitting coil Parallel transmitting coil at the rear end MOSFETs of the transmitter inverter module Source and MOSFET Drain; transmitting coil Parallel capacitor at the rear end and capacitors capacitor MOSFETs connected to the transmitter inverter module at the back end Source, capacitor MOSFETs of the back-end parallel transmitter inverter module Source, MOSFET Drain and power supply Negative electrode; the resonant coupling transmission module also includes a receiving coil. Receiving coil The receiving compensation network is connected to the receiving end rectification module; the transmitting coil The transmitting coil The receiving coil They are mutually attracted to each other.

2. The transmitter-side reconfiguration multi-mode wireless charging system for electric bicycle charging according to claim 1, characterized in that: The receiving compensation network includes capacitors. The capacitor The receiving coil The receiving end rectifier module is connected in series.

3. The transmitter-side reconfiguration multi-mode wireless charging system for electric bicycle charging according to claim 2, characterized in that: The receiving end rectification module includes a full-bridge rectifier circuit and a filter capacitor. Battery equivalent load The full-bridge rectifier circuit is connected in parallel with the filter capacitor. and the battery equivalent load The full-bridge rectifier circuit and the capacitor The receiving coil Connected.

4. The transmitter-side reconfiguration multi-mode wireless charging system for electric bicycle charging according to claim 1, characterized in that: The capacitor and the capacitor Together they form a resonant capacitor The capacitor and the capacitor Together they form a topological capacitor ; Each resonant circuit satisfies the following conditions: ； in, Angular frequency, For transmitting coil and transmitting coil Mutual intuition between them For transmitting coil and receiving coil Mutual intuition between them transmitting coil and receiving coil Mutual attraction between them.

5. The transmitter-side reconfiguration multi-mode wireless charging system for electric bicycle charging according to claim 4, characterized in that: The angular frequency satisfy ,in For frequency.

6. A charging method for a transmitter-side reconfiguration multi-mode wireless charging system for electric bicycle charging based on claim 1, characterized in that: When constant current mode output is required, the MOSFET of the transmitter-side reconfigurable multi-mode wireless charging system MOSFET remains on MOSFET and MOSFET The circuit remains off; at this time, the transmitting coil... The resonant circuit in question is not connected to the circuit; MOSFET and MOSFET Together they form a half-bridge inverter circuit and alternately conduct with a 50% duty cycle; When operating in the first constant voltage mode, the MOSFET of the transmitter-side reconfiguration multi-mode wireless charging system MOSFET and MOSFET MOSFET remains on The transmitter capacitor remains off. The resonant circuit in question is not connected to the circuit; MOSFET and MOSFET Together they form a half-bridge inverter circuit and alternately conduct with a 50% duty cycle; When operating in the second constant voltage mode, the MOSFET of the transmitter-side reconfiguration multi-mode wireless charging system MOSFET and MOSFET Set to continuous conduction, MOSFET The transmitter capacitor remains off. The resonant circuit in question is not connected to the circuit; MOSFET and MOSFET Together they form a half-bridge inverter circuit and alternately conduct with a 50% duty cycle.

7. The charging method according to claim 6, characterized in that: The capacitor and the capacitor Together they form a resonant capacitor The capacitor and the capacitor Together they form a topological capacitor ; Each resonant circuit satisfies the following conditions: ； in, Angular frequency, For transmitting coil and transmitting coil Mutual intuition between them For transmitting coil and receiving coil Mutual intuition between them transmitting coil and receiving coil Mutual intuition between them; The angular frequency satisfy ,in For frequency.

8. The charging method according to claim 7, characterized in that, In constant current mode output, the transmitter side reconstructs the constant output current of the multi-mode wireless charging system. and input impedance It is represented as: ； When operating in the first constant voltage mode, the transmitter side reconfigures the first voltage output specification of the multi-mode wireless charging system. and input impedance It is represented as: ； When operating in the second constant voltage mode, the transmitter side reconfigures the second voltage output specification of the multi-mode wireless charging system. and input impedance It is represented as: 。

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