Anti-offset LCC-N-LC series hybrid topology WPT wireless charging system and parameter design method thereof

Abstract

The invention discloses an anti-offset LCC-N-LC series hybrid topology WPT wireless charging system and a parameter design method thereof.The wireless charging system comprises a transmitting side and a receiving side, and the transmitting side is composed of a direct-current power source UD, a high-frequency inverter and a transmitting side coil loop; the receiving side consists of a receiving side coil loop, a rectifier filter and a battery load RL; the transmitting side coil loop comprises a transmitting coil LP, a transmitting coil LQ1, an LCC compensation topology network and a compensation capacitor CQ1, and the receiving side coil loop comprises a receiving coil LS, a receiving coil LQ2, a compensation capacitor CS and a compensation capacitor CQ2. The invention also specifically discloses a specific parameter design method of the wireless charging system. According to the circuit structure, on the basis that offset resistance can be achieved in the transverse direction and the longitudinal direction under the fixed frequency, load-independent constant-current output can be achieved through the composite topological structure of the circuit structure.

Description

Technical Field

[0001] The present invention belongs to the technical field of wireless power transmission systems, and specifically relates to a WPT wireless charging system with an anti-offset LCC-N-LC series hybrid topology and a parameter design method thereof. Background Art

[0002] Wireless power transfer (WPT) is an emerging technology that enables contactless power transmission from microwave to kilowatt power levels. Wireless power transmission means that the power from the transmitter is transmitted to the receiver without the need for mechanical contact. Based on WPT technology, the power supply can be quickly and conveniently provided without the use of power cords while maintaining the same performance as plug-in charging. Nowadays, wireless power transmission methods are receiving more and more attention from the international research community. Due to the requirements of the lithium battery charging process, the wireless charging system needs to meet the constant current charging mode and the constant voltage charging mode. In recent years, in order to achieve the constant current charging mode, relevant scholars at home and abroad have carried out a series of research work. In current wireless charging systems, in order to meet the constant current charging mode, high-order basic compensation topologies are often used, but the output characteristics of a single type of compensation topology are fixed and anti-offset performance cannot be achieved. Summary of the Invention

[0003] The technical problem solved by the present invention is to provide a WPT wireless charging system with an anti-drift LCC-N-LC series hybrid topology and a parameter design method thereof, wherein the wireless charging system can realize constant current charging while enhancing the anti-drift capability.

[0004] The present invention adopts the following technical solution to solve the above technical problems: a WPT wireless charging system with an anti-offset LCC-N-LC series hybrid topology, characterized in that: the wireless charging system includes a transmitting side and a receiving side, wherein the transmitting side is powered by a DC power supply U D , high-frequency inverter and transmitting side coil circuit, the receiving side consists of receiving side coil circuit, rectifier filter and battery load R L composition;

[0005] The transmitting side coil loop includes a transmitting coil L P , transmitting coil L Q1 , LCC compensation topology network and compensation capacitor C Q1 , the LCC compensation topology network includes the compensation inductor L R , compensation capacitor C R and compensation capacitor C P , transmitting coil L Q1 With compensation capacitor C Q1 Series and resonant, compensation capacitor C Q1 The other end is connected to the negative output terminal of the high frequency inverter, and the transmitting coil L Q1 The other end is connected to the transmitting coil LP Series, transmitting coil L P The other end is connected to the compensation capacitor C P In series, compensation capacitor C P The other end is connected to the compensation inductor L R Series, compensation inductor L R The other end is connected to the positive output of the high-frequency inverter, and the compensation capacitor C R One end and the compensation inductor L R and compensation capacitor C P Common line terminal connection, compensation capacitor C R The other end is connected to the transmitting coil L P and the transmitting coil L Q1 Common line connection, DC power supply U D The output end is connected to the input end of the high-frequency inverter;

[0006] The receiving side coil loop includes a receiving coil L S , receiving coil L Q2 , compensation capacitor C S and compensation capacitor C Q2 , receiving coil L S With compensation capacitor C S Series and resonant, receiving coil L S The other end is connected to the receiving coil L Q2 Series, receiving coil L Q2 The other end is connected to the compensation capacitor C Q2 Series and resonant, compensation capacitor C Q2 The other end is connected to the negative input terminal of the rectifier filter, and the compensation capacitor C S The other end is connected to the positive input of the rectifier filter, the output of the rectifier filter and the battery load R L Input connection.

[0007] Furthermore, the transmitting coil L P With the receiving coil L S All are monopole coils; the transmitting coil L Q1 With the receiving coil L Q2 All are four-pole coils; the transmitting coil L P With the transmitting coil L Q1 The coaxial closely stacked configuration constitutes the transmitting side coil, the receiving coil L S With the receiving coil L Q2 The receiving coil is formed by coaxially stacking the transmitting coil and the receiving coil is placed coaxially and parallel to each other. Q1 and receiving coil L Q2 They are located on opposite sides of the transmitting side coil and the receiving side coil respectively.

[0008] The parameter design method of the WPT wireless charging system with an anti-offset LCC-N-LC series hybrid topology described in the present invention is characterized by the following specific process:

[0009] The compensation inductor L R The design mathematical function relationship is as follows:

[0010]

[0011] The compensation capacitor C R The design mathematical function relationship is as follows:

[0012]

[0013] The compensation capacitor C P The design mathematical function relationship is as follows:

[0014]

[0015] The compensation capacitor C Q1 The design mathematical function relationship is as follows:

[0016]

[0017] The compensation capacitor C S The design mathematical function relationship is as follows:

[0018]

[0019] The compensation capacitor C Q2 The design mathematical function relationship is as follows:

[0020]

[0021] G in the above design equation I is the transconductance gain of the WPT wireless charging system with LCC-N-LC series hybrid topology, ω is the system operating angular frequency, M 14 is the transmitting coil L P and receiving coil L S Mutual inductance, M 23 is the transmitting coil L Q1 With L Q2 mutual induction.

[0022] The beneficial effects and advantages of the present invention are as follows: the WPT wireless charging system with an anti-drift LCC-N-LC series hybrid topology proposed in the present invention is a new compensation topology structure. The system parameters are reasonably designed to enable the wireless charging system to meet constant current charging and improve the system's anti-drift capability. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is the circuit diagram of the WPT wireless charging system with an anti-offset LCC-N-LC series hybrid topology;

[0024] In the figure, 1-high frequency inverter, 2-transmitting side coil circuit, 3-receiving side coil circuit, 4-rectifier filter.

[0025] Figure 2 It is a simplified equivalent circuit diagram of the WPT wireless charging system with an anti-offset LCC-N-LC series hybrid topology.

[0026] Figure 3 This is the coil coupling mechanism diagram of the WPT wireless charging system with anti-offset LCC-N-LC series hybrid topology.

[0027] Figure 4 1 is a graph showing output current values for different loads when the coil is offset according to an embodiment of the present invention. DETAILED DESCRIPTION

[0028] In order to make the content and advantages of the technical solution of the present invention more clear, the following is a further detailed description of the design method of a WPT wireless charging system with an anti-offset LCC-N-LC series hybrid topology proposed by the present invention in conjunction with the accompanying drawings.

[0029] like Figure 1 As shown, the WPT wireless charging system with an anti-offset LCC-N-LC series hybrid topology of the present invention includes a transmitting side and a receiving side, wherein the transmitting side is provided with a DC power supply U D , high-frequency inverter 1 and transmitting side coil loop 2; the receiving side consists of receiving side coil loop 3, rectifier filter 4 and battery load R L composition;

[0030] The transmitting side coil loop 2 includes a transmitting coil L P , transmitting coil L Q1 , LCC compensation topology network and compensation capacitor C Q1 , the LCC compensation topology network includes the compensation inductor L R , compensation capacitor C R and compensation capacitor C P , transmitting coil L Q1 With compensation capacitor C Q1 Series and resonant, compensation capacitor C Q1 The other end is connected to the negative output terminal of the high frequency inverter 1, and the transmitting coil L Q1 The other end is connected to the transmitting coil L P Series, transmitting coil L P The other end is connected to the compensation capacitor C P In series, compensation capacitor C P The other end is connected to the compensation inductor L RSeries, compensation inductor L R The other end is connected to the positive output end of high frequency inverter 1, compensation capacitor C R One end and the compensation inductor L R and compensation capacitor C P Common line terminal connection, compensation capacitor C R The other end is connected to the transmitting coil L P and the transmitting coil L Q1 Common line connection, DC power supply U D The output end is connected to the input end of the high frequency inverter 1;

[0031] The receiving side coil loop 3 includes a receiving coil L S , receiving coil L Q2 , compensation capacitor C S and compensation capacitor C Q2 , receiving coil L S With compensation capacitor C S Series and resonant, receiving coil L S The other end is connected to the receiving coil L Q2 Series, receiving coil L Q2 The other end is connected to the compensation capacitor C Q2 Series and resonant, compensation capacitor C Q2 The other end is connected to the negative input terminal of the rectifier filter 4, and the compensation capacitor C S The other end is connected to the positive input of the rectifier filter 4, and the output of the rectifier filter 4 is connected to the battery load R L Input connection.

[0032] The transmitting coil L of the present invention P With the receiving coil L S All are monopole coils; the transmitting coil L Q1 With the receiving coil L Q2 All are four-pole coils; the transmitting coil L P With the transmitting coil L Q1 The coaxial closely stacked configuration constitutes the transmitting side coil, the receiving coil L S With the receiving coil L Q2 The receiving coil is formed by coaxially stacking the transmitting coil and the receiving coil is placed coaxially and parallel to each other. Q1 and receiving coil L Q2 They are located on opposite sides of the transmitting side coil and the receiving side coil respectively.

[0033] Figure 2 This is a simplified equivalent circuit diagram of the WPT wireless charging system with an anti-offset LCC-N-LC series hybrid topology. It can be seen from the figure: U I is the voltage generated by the high-frequency inverter, R O is the receiving coil LS The equivalent AC load resistance of the back-end components can be calculated using the following formula:

[0034]

[0035] like Figure 2 As shown, the mathematical modeling equation of the system is:

[0036]

[0037] in

[0038]

[0039] In formula (9), I1 is the output current of the high-frequency inverter, and I2 is the current flowing into the transmitter-side compensation capacitor C P Current, I O is the current flowing through the load; Z R is the series compensation inductor L R Impedance, Z C is the parallel compensation capacitor C R Impedance, Z Q1 Compensation capacitor C for the transmitter side Q1 and the transmitting side coil L Q1 Impedance, Z P is the transmitting coil L P and the transmitter side compensation capacitor C P The impedance, Z S The receiving coil L S and the receiving side compensation capacitor C S Impedance, Z Q2 is the receiving side compensation capacitor C Q2 and the receiving side coil L Q2 Impedance, Z M23 is the transmitting coil L P and receiving coil L S The mutual impedance between M14 is the transmitting coil L Q1 and receiving coil L Q2 The mutual impedance between them, ω is the operating angular frequency of the system;

[0040] According to formula (9), I O

[0041]

[0042] in

[0043]

[0044] In the formula, A and B are intermediate variables;

[0045] System transconductance gain G I Expressed as

[0046]

[0047] Through the above analysis, the intermediate variable B = 0 and the system input impedance angle is zero, and the system parameters of the constant current output are obtained, which meet the following conditions:

[0048] Z C Z P +Z C Z R +Z P Z R =0 (14)

[0049] Using the above conditions, the corresponding input and output currents in the proposed WPT system can be further simplified as:

[0050]

[0051] According to formula (15), the transconductance gain G I can be rewritten as:

[0052]

[0053] Obviously, from equations (15) and (16), it can be seen that the system output current and the load resistance R O The system achieves constant current output. According to formulas (9), (10), (11), and (14), the series compensation inductor L can be obtained. R , parallel compensation capacitor C R and the transmitter side compensation capacitor C T , receiving side compensation capacitor C Q1 、C Q2 、C S The expression is:

[0054]

[0055] Figure 3 This is the coil coupling mechanism diagram of the WPT wireless charging system with an anti-offset LCC-N-LC series hybrid topology. The transmitting coil L P With the receiving coil L S It is a monopole coil; the transmitting coil L Q1 With the receiving coil L Q2 It is a four-pole coil; the transmitting coil L P With L Q1 Tightly stacked to form one side coil, the transmitting coil L Q1 Stacked inside; receiving coil L S , L Q2The other side coil is tightly stacked, the receiving coil L Q2 Stacked inside; transmitting coil L P , L Q1 With the receiving coil L S , L Q2 Placed coaxially and in parallel.

[0056] Figure 4 This is a graph of the output current values of different loads when the coil of the present invention is offset. Within the offset distance of 0-50mm, the output current remains stable, and the output fluctuation does not exceed 7%. Constant current output is achieved in a relatively large range in both the horizontal and vertical directions.

[0057] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A WPT wireless charging system with an anti-drift LCC-N-LC series hybrid topology, characterized by: The wireless charging system includes a transmitting side and a receiving side, wherein the transmitting side is powered by a DC power supply U D , high-frequency inverter and transmitting side coil circuit, the receiving side consists of receiving side coil circuit, rectifier filter and battery load R L composition; The transmitting side coil loop includes a transmitting coil L P , transmitting coil L Q1 , LCC compensation topology network and compensation capacitor C Q1 , the LCC compensation topology network includes the compensation inductor L R , compensation capacitor C R and compensation capacitor C P , transmitting coil L Q1 With compensation capacitor C Q1 Series and resonant, compensation capacitor C Q1 The other end is connected to the negative output terminal of the high frequency inverter, and the transmitting coil L Q1 The other end is connected to the transmitting coil L P Series, transmitting coil L P The other end is connected to the compensation capacitor C P In series, compensation capacitor C P The other end is connected to the compensation inductor L R Series, compensation inductor L R The other end is connected to the positive output of the high-frequency inverter, and the compensation capacitor C R One end and the compensation inductor L R and compensation capacitor C P Common line terminal connection, compensation capacitor C R The other end is connected to the transmitting coil L P and the transmitting coil L Q1 Common line connection, DC power supply U D The output end is connected to the input end of the high-frequency inverter; The receiving side coil loop includes a receiving coil L S , receiving coil L Q2 , compensation capacitor C S and compensation capacitor C Q2 , receiving coil L S With compensation capacitor C S Series and resonant, receiving coil L S The other end is connected to the receiving coil L Q2 Series, receiving coil L Q2 The other end is connected to the compensation capacitor C Q2 Series and resonant, compensation capacitor C Q2 The other end is connected to the negative input terminal of the rectifier filter, and the compensation capacitor C S The other end is connected to the positive input of the rectifier filter, the output of the rectifier filter and the battery load R L Input connection.

2. The WPT wireless charging system with an anti-drift LCC-N-LC series hybrid topology according to claim 1 is characterized by: The transmitting coil L P With the receiving coil L S All are monopole coils; the transmitting coil L Q1 With the receiving coil L Q2 All are four-pole coils; the transmitting coil L P With the transmitting coil L Q1 The coaxial closely stacked configuration constitutes the transmitting side coil, the receiving coil L S With the receiving coil L Q2 The receiving coil is formed by coaxially stacking the transmitting coil and the receiving coil is placed coaxially and parallel to each other. Q1 and receiving coil L Q2 They are located on opposite sides of the transmitting side coil and the receiving side coil respectively.

3. The parameter design method of a WPT wireless charging system with an anti-offset LCC-N-LC series hybrid topology according to claim 1 or 2 is characterized in that The specific process is: The compensation inductor L R The design mathematical function relationship is as follows: The compensation capacitor C R The design mathematical function relationship is as follows: The compensation capacitor C P The design mathematical function relationship is as follows: The compensation capacitor C Q1 The design mathematical function relationship is as follows: The compensation capacitor C S The design mathematical function relationship is as follows: The compensation capacitor C Q2 The design mathematical function relationship is as follows: G in the above design equation I is the transconductance gain of the WPT wireless charging system with LCC-N-LC series hybrid topology, ω is the system operating angular frequency, M 14 is the transmitting coil L P and receiving coil L S Mutual inductance, M 23 is the transmitting coil L Q1 With L Q2 mutual induction.

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