A series injection type system and method for improving the performance of simultaneous wireless information and power transfer

Abstract

The present invention relates to the field of wireless power transmission, and discloses a series injection type system and method for improving the performance of wireless signal and energy co - transmission. After determining the parameters of the power resonance circuit according to the actual power demand, the frequency distribution of the signal carrier source is obtained according to the demand for the transmission bandwidth of the information path; from the signal carrier source frequency, the resonance parameters of the information circuit can be derived through the resonance conditions of the information circuit; draw the voltage gain curve of the information transmission path to obtain the gain pole frequency, that is, the actual resonance frequency of the information circuit; update the signal carrier source frequency to the gain pole frequency; this method solves the problem that it is difficult to calculate the offset value of the actual resonance frequency of the information circuit compared with the designed resonance frequency, and can obtain the actual resonance frequency of the information circuit considering the offset situation, which is beneficial to improving the information transmission performance of the system.

Description

Technical Field

[0001] The present invention relates to the technical field of wireless power transmission, and in particular to a series injection system and method for improving the performance of wireless signal and energy simultaneous transmission. Background Art

[0002] With the development of wireless power transmission technology, real-time communication between the transmitter and the receiver is often required to realize the state detection, charging handshake, closed-loop feedback control and other requirements of the charging system. Therefore, wireless signal-to-energy transmission technology has emerged. The method of introducing different frequency carriers to transmit information is called injection communication. This method is based on a shared channel. After the high-frequency communication carrier is modulated by ASK, FSK, PSK and other modulation technologies, the high-frequency carrier is injected into the magnetic coupling channel by transformer coupling or inductive coupling, and then extracted at the receiving end by the same method to realize information demodulation. With its advantages in communication rate, injection communication has become one of the research hotspots of wireless signal-to-energy transmission technology. In most injection-type wireless signal-to-energy transmission systems, the information channel and the power channel are coupled with each other, making the system parameter design more complex. The parameter design of the current injection-type wireless signal-to-energy transmission system is mostly based on the resonance conditions satisfied by the circuit, ignoring the resonance offset caused by channel coupling, resulting in a deviation between the designed resonance point and the actual resonance point, affecting the system performance. Summary of the invention

[0003] 1. Technical issues to be solved

[0004] In view of the deficiencies in the prior art, the present invention provides a series injection system and method for improving the performance of wireless signal transmission, obtaining the actual resonant frequency of the information circuit after considering the offset condition, which is beneficial to improving the system information transmission performance.

[0005] (II) Technical solution

[0006] To achieve the above objectives, the present invention is implemented through the following technical solutions:

[0007] In the first aspect, a series injection system and method for improving the performance of wireless signal transmission are provided, including a DC power supply, a full-bridge inverter circuit, an electric energy transmitting circuit, an electric energy receiving circuit, a signal carrier source, a data transmitting circuit, a data receiving circuit, a rectifier circuit and a resistive load, wherein the DC power supply is connected to the input end of the full-bridge inverter circuit; the output end of the full-bridge inverter circuit is connected to the electric energy transmitting circuit; and the signal carrier source is composed of three carrier frequency sinusoidal waves superimposed in time.

[0008] Preferably, the full-bridge inverter circuit includes a switch tube Q1, a switch tube Q2, a switch tube Q3 and a switch tube Q4;

[0009] The electric energy transmitting circuit includes a transmitting coil L1, a primary compensation capacitor C1, an internal resistance R1 of the transmitting coil, and a coupling transformer winding L c1 ;

[0010] The electric energy receiving circuit includes a receiving coil L2, a secondary compensation capacitor C2, an internal resistance R2 of the receiving coil, and a coupling transformer winding L c3 ;

[0011] The data transmitting circuit includes an inductor L p1 , a capacitor C p1 , a capacitor C p2 , a coupling transformer winding L c2 and a symbol conversion switch S1;

[0012] The data receiving circuit includes an inductor L s1 , a capacitor C s1 , a capacitor C s2 , a coupling transformer winding L c4 and a signal extraction resistor R s .

[0013] Preferably, the transmitting coil L1, the primary compensation capacitor C1, the internal resistance R1 of the transmitting coil, and the coupling transformer winding L c1 are connected in series;

[0014] The receiving coil L2 and the coupling transformer winding L c3 are connected in series with the internal resistance R2 of the receiving coil and then connected in parallel with the secondary compensation capacitor C2;

[0015] The secondary compensation capacitor C2 is connected to the input end of the rectifier circuit, and the output end of the rectifier circuit is connected to a resistive load R L ;

[0016] The signal carrier source V c has one end connected to an inductor L p1 , the signal carrier source V c has the other end connected to a capacitor C p1 , the other end of the inductor L p1 is connected to the other end of the capacitor C p1 , the other end of the inductor L p1 is also connected to the symbol conversion switch S1, the other end of the symbol conversion switch S1 is connected to the coupling transformer winding L c2 , the other end of the coupling transformer winding L c2 is connected to a capacitor C p2 , the other end of the capacitor C p2 is connected to the capacitor C p1 ;

[0017] The signal extraction resistor R s has one end connected to an inductor Ls1 is connected to the signal extraction resistor R s The other end is connected to the capacitor C s1 is connected to the inductor L s1 The other end of the inductor L and the capacitor C s1 The other end is connected. The capacitor C s2 One end is connected to the signal extraction resistor R s is connected, and the other end is connected to the coupling transformer winding L c4 is connected. The coupling transformer winding L c4 The other end of the inductor L and the inductor L s1 are connected.

[0018] Preferably, the power transmission circuit compensation structure adopts a series compensation topology, and the power reception circuit compensation structure adopts a parallel compensation topology.

[0019] Preferably, the data transmission circuit compensation structure adopts an LCC compensation structure, and the data reception circuit compensation structure adopts an LCC compensation topology.

[0020] In a second aspect, a series injection method for improving the performance of wireless signal and energy co - transmission is provided, including the following steps:

[0021] S1: Determine the DC input voltage V according to the actual power demand, in self - inductance L1 of the power transmission coil, self - inductance L2 of the power reception coil, mutual inductance M of the power transmission coils, inductance L of the information circuit coupling transformer winding c1 L, c2 L, c3 L, c4 L, L mutual inductances M1 and M2 of the information circuit coupling transformer, power resonance angular frequency ω0, load resistor R

[0022] S2: Derive the primary - side compensation capacitor C1 and the secondary - side compensation capacitor C2 according to the resonance conditions of the power circuit;

[0023] S3: Obtain the initial information carrier center resonance angular frequency ω2. According to the requirements for the transmission bandwidth of the information circuit, given the initial information carrier resonance angular frequencies ω1 and ω3, obtain the capacitance ratio k of the information coupling circuit through the information carrier angular frequency distribution formula;

[0024] S4: Derive the inductances L p1 and inductance L s1 in the LCC coupling circuit according to the capacitance ratio k of the information coupling circuit determined in step S3 and the inductance constraint conditions;

[0025] S5: From the inductances L p1 and inductance L s1 determined in step S4 and the resonance conditions of the information circuit, the capacitance C in the LCC coupling circuit can be derivedp1 , C p2 , C s1 , C s2 , and a signal extraction resistor R s ;

[0026] S6: After the signal parameters are determined, the voltage gain curve of the information transmission path can be plotted, and three voltage gain amplification poles f c1 , f c2 and f c3 ;

[0027] S7: Set the poles f c1 , f c2 and f c3 obtained from the actual gain curve as the frequencies of the information subcarrier sources.

[0028] Preferably, the specific formulas for deriving the primary compensation capacitor C1 and the secondary compensation capacitor C2 according to the resonance conditions of the power circuit are as follows:

[0029]

[0030] Preferably, the specific formula for the capacitance ratio k of the information coupling circuit obtained through the information carrier angular frequency distribution formula is as follows:

[0031]

[0032] Preferably, the inductance L p1 and the inductance L s1 are derived by the following formulas:

[0033]

[0034] Preferably, the capacitance C p1 , C p2 , C s1 , C s2 are derived by the following formulas:

[0035]

[0036]

[0037] (III) Advantageous Effects

[0038] The series injection type system and method for improving the wireless signal and energy co - transmission performance of the present invention solve the problem that it is difficult to calculate the deviation value of the actual resonance frequency of the information circuit compared with the designed resonance frequency, and can obtain the actual resonance frequency of the information circuit considering the deviation situation, which is beneficial to improving the information transmission performance of the system. Description of the Drawings

[0039] The present invention will be further described below in conjunction with the accompanying drawings.

[0040] Figure 1 A structural diagram of a serial injection system for improving the performance of wireless signal transmission according to an embodiment of the present application;

[0041] Figure 2 Flow chart of the parameter design method of serial injection system for improving the performance of wireless signal transmission;

[0042] Figure 3 It is a voltage gain curve diagram of the signal transmission path; DETAILED DESCRIPTION

[0043] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0044] like Figure 1 As shown, the embodiment of the present invention provides a series injection system for improving the performance of wireless signal energy simultaneous transmission, including a DC power supply, a full-bridge inverter circuit, an electric energy transmitting circuit, an electric energy receiving circuit, a signal carrier source, a data transmitting circuit, a data receiving circuit, a rectifier circuit and a resistive load, characterized in that

[0045] The full-bridge inverter circuit includes a switch tube Q1, a switch tube Q2, a switch tube Q3 and a switch tube Q4;

[0046] The electric energy transmitting circuit includes a transmitting coil L1, a primary compensation capacitor C1, a transmitting coil internal resistance R1 and a coupling transformer winding L c1 ;

[0047] The electric energy receiving circuit includes a receiving coil L2, a secondary compensation capacitor C2, a receiving coil internal resistance R2 and a coupling transformer winding L c3 ;

[0048] The signal carrier source is composed of three carrier frequency sine waves superimposed in time division;

[0049] The data transmission circuit includes an inductor L p1 , capacitor C p1 , capacitor C p2 , coupling transformer winding L c2 and symbol conversion switch S1;

[0050] The data receiving circuit includes an inductor L s1 , capacitor C s1 , capacitor C s2, coupling transformer winding L c4 and signal extraction resistor R s .

[0051] The DC power supply is connected to the input end of the full-bridge inverter circuit;

[0052] The output end of the full-bridge inverter circuit is connected to the power transmission circuit;

[0053] The transmitting coil L1, the primary compensation capacitor C1, the internal resistance R1 of the transmitting coil, and the coupling transformer winding L c1 are connected in series;

[0054] The receiving coil L2 and the coupling transformer winding L c3 are connected in series and then connected in parallel with the secondary compensation capacitor C2;

[0055] The secondary compensation capacitor C2 is connected to the input end of the rectifier circuit, and the output end of the rectifier circuit is connected to the resistive load R L ;

[0056] In the data sending circuit, one end of the signal carrier source V c is connected to the inductor L p1 , and the other end of the signal carrier source V c is connected to the capacitor C p1 . The other end of the inductor L p1 is connected to the other end of the capacitor C p1 . The other end of the inductor L p1 is also connected to the symbol conversion switch S1. The other end of the symbol conversion switch S1 is connected to the coupling transformer winding L c2 . The other end of the coupling transformer winding L c2 is connected to the capacitor C p2 . The other end of the capacitor C p2 is connected to the capacitor C p1 ;

[0057] In the data receiving circuit, one end of the signal extraction resistor R s is connected to the inductor L s1 . The other end of the signal extraction resistor R s is connected to the capacitor C s1 . The other end of the inductor L s1 is connected to the other end of the capacitor C s1 . One end of the capacitor C s2 is connected to the signal extraction resistor R s , and the other end is connected to the coupling transformer winding L c4 . The other end of the coupling transformer winding L c4 is connected to the inductor L s1 .

[0058] The compensation structure of the power transmitting circuit adopts a series compensation topology, the compensation structure of the power receiving circuit adopts a parallel compensation topology, the compensation structure of the data transmitting circuit adopts an LCC compensation structure, and the compensation structure of the data receiving circuit adopts an LCC compensation topology;

[0059] As Figure 2 shown, the embodiment of the present invention also provides a series injection method for improving the performance of wireless power and information co - transmission, and the method includes the following steps:

[0060] S1: Determine the DC input voltage V in , the self - inductance L1 of the power transmitting coil, the self - inductance L2 of the power receiving coil, the mutual inductance M of the power transmission coils, the winding inductance L c1 of the information circuit coupling transformer, L c2 , L c3 , L c4 , L L , the power resonance angular frequency ω0, and the load resistance R

[0061] S2: Deduce the power resonance capacitors C1 and C2 according to the power circuit resonance conditions of the following formula; as shown in Equation (1)

[0062]

[0063] S3: Obtain the initial information carrier center resonance angular frequency ω2. According to the requirements for the transmission bandwidth of the information circuit, given the initial information carrier resonance angular frequencies ω1 and ω3, obtain the capacitance ratio k of the information coupling circuit through the information carrier angular frequency distribution formula of the following formula; as shown in Equation (2) and Equation (3):

[0064]

[0065]

[0066] S4: Deduce the inductance L p1 and inductance L s1 in the LCC coupling circuit according to the capacitance ratio k of the information coupling circuit determined in step S3 and the inductance constraint conditions; as shown in Equation (4):

[0067]

[0068] S5: From the inductance L p1 and inductance L s1 determined in step S4 and the information circuit resonance conditions of the following formula, the capacitances C p1 , C p2 , C s1 , C s2 in the LCC coupling circuit can be deduced, and the signal extraction resistance R s; as shown in Formula (5) and Formula (6):

[0069]

[0070]

[0071] S6: After the signal parameters are determined, the voltage gain curve of the information transmission path can be plotted, and three voltage gain amplification poles f c1 、f c2 and f c3 ;

[0072] S7: Set the poles f c1 、f c2 and f c3 obtained from the actual gain curve as the frequencies of the information subcarrier sources.

[0073] Example: According to the parameter design method of the series injection type system for improving the co - transmission performance of wireless signal and energy, a complete set of system parameters was designed, as shown in Table 1; a simulation platform was built with the parameters in Table 1 to verify the correctness of this method, Figure 3 is the voltage gain curve diagram of the signal transmission path, from which the voltage gain amplification poles f c1 、f c2 and f c3 are 1.194 MHz, 1.535 MHz, and 1.784 MHz respectively.

[0074] Table 1 Parameters of the series injection type system for improving the co - transmission performance of wireless signal and energy

[0075]

[0076] Embodiments of the present application can be provided as a method or a computer program product. Therefore, the present application can take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware aspects. Moreover, the present application can take the form of a computer program product implemented on one or more computer - usable storage media (including but not limited to disk storage, CD - ROM, optical storage, etc.) containing computer - usable program code. The solutions in the embodiments of the present application can be implemented in various computer languages. For example, object - oriented programming languages such as Java and interpreted scripting languages such as JavaScript, etc.

[0077] This application is described with reference to the flowcharts and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It should be understood that each flow and / or block in the flowchart and / or block diagram, and the combination of flows and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to the processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to generate a machine, such that the instructions executed by the processor of the computer or other programmable data processing device produce a means for implementing the specified functions in the process Figure 1 one process or multiple processes and / or blocks Figure 1 one block or multiple blocks.

[0078] These computer program instructions can also be stored in a computer-readable memory that can direct a computer or other programmable data processing device to work in a specific manner, such that the instructions stored in the computer-readable memory produce a manufactured article including an instruction means that implements the specified functions in the process Figure 1 one process or multiple processes and / or blocks Figure 1 one block or multiple blocks.

[0079] These computer program instructions can also be loaded onto a computer or other programmable data processing device, such that a series of operation steps are executed on the computer or other programmable device to generate a computer-implemented process, so that the instructions executed on the computer or other programmable device provide steps for implementing the specified functions in the process Figure 1 one process or multiple processes and / or blocks Figure 1 one block or multiple blocks.

[0080] It should be noted that, in this article, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, such that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed, or further includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "including one..." does not exclude the existence of additional identical elements in the process, method, article or device including the said element.

Claims

1. A series injection method for improving the performance of simultaneous wireless information and power transfer, characterized in that The method is based on a series injection system for improving the performance of wireless signal and energy simultaneous transmission. The system includes a DC power supply, a full-bridge inverter circuit, an electric energy transmitting circuit, an electric energy receiving circuit, a signal carrier source, a data transmitting circuit, a data receiving circuit, a rectifier circuit, and a resistive load. The DC power supply is connected to the input end of the full-bridge inverter circuit, the output end of the full-bridge inverter circuit is connected to the electric energy transmitting circuit, and the signal carrier source is composed of three sine waves of carrier frequencies superimposed in time division; The electric energy transmitting circuit includes a transmitting coil L1, a primary compensation capacitor C1, an internal resistance R1 of the transmitting coil, and a coupling transformer winding L c1 ; The electric energy receiving circuit includes a receiving coil L2, a secondary compensation capacitor C2, an internal resistance R2 of the receiving coil, and a coupling transformer winding L c3 ; The data sending circuit includes an inductor L p1 , a capacitor C p1 , a capacitor C p2 , a coupling transformer winding L c2 and a symbol transformation switch S1; The data receiving circuit includes an inductor L s1 , a capacitor C s1 , a capacitor C s2 , a coupling transformer winding L c4 , and a signal extraction resistor R s ; The method comprises the following steps: S1: Determine the DC input voltage V according to the actual power demand in , the self-inductance L1 of the power transmission coil, the self-inductance L2 of the power receiving coil, the mutual inductance M of the power transmission coils, the inductance L of the winding of the information circuit coupling transformer c1 , L c2 , L c3 , L c4 , the mutual inductances M1 and M2 of the information circuit coupling transformer, the power resonance angular frequency ω0, the load resistance R L ; S2: Derive the primary compensation capacitor C1 and the secondary compensation capacitor C2 according to the resonance condition of the power circuit; S3: Obtain the center resonant angular frequency ω2 of the initial information carrier, and according to the demand for the information circuit transmission bandwidth, the initial information carrier resonant angular frequencies ω1 and ω3 are given, and the capacitance ratio k of the information coupling circuit is obtained through the information carrier angular frequency distribution formula; S4: Derive the inductance L in the LCC coupling circuit based on the capacitance ratio k of the information coupling circuit and the inductance constraint condition determined in step S3 p1 and the inductance L s1 ; S5: Inductance L determined in step S4 p1 and inductance L s1 Based on the inductance L and the resonance condition of the information circuit, the capacitance C in the LCC coupling circuit can be derived p1 , C p2 , C s1 , C s2 , and the signal extraction resistor R is given s ; S6: After the signal parameters are determined, the voltage gain curve of the information transmission path can be plotted, and three voltage gain amplification poles f c1 、f c2 and f c3 ; S7: Set the poles f c1 , f c2 and f c3 obtained from the actual gain curve as the frequencies of the information subcarrier sources.

2. The series injection method for improving the co - transmission performance of wireless signal and energy according to claim 1, wherein The specific formula for deriving the primary compensation capacitor C1 and the secondary compensation capacitor C2 according to the power circuit resonance condition is as follows:

3. The series injection method for improving the co - transmission performance of wireless signal energy as claimed in claim 2, wherein The specific formula for obtaining the capacitance ratio k of the information coupling circuit through the information carrier angular frequency distribution formula is as follows:

4. The series injection method for improving the co - transmission performance of wireless signal energy according to claim 3, characterized in that, The inductor L p1 and the inductor L s1 The derivation formula is as follows:

5. The series injection method for improving the performance of simultaneous wireless information and power transfer according to claim 4, characterized in that The capacitor C p1 , C p2 , C s1 , C s2 The derivation formula is as follows:

6. The series injection method for improving the co - transmission performance of wireless signal energy, according to claim 1, is characterized in that The full-bridge inverter circuit includes a switch tube Q1, a switch tube Q2, a switch tube Q3 and a switch tube Q4.

7. The series injection method for improving the performance of simultaneous wireless information and power transfer according to claim 6, characterized in that The transmitting coil L1, the primary compensation capacitor C1, the internal resistance R1 of the transmitting coil, and the winding L of the coupling transformer c1 are connected in series; The receiving coil L2 and the coupling transformer winding L c3 are connected in series with the internal resistance R2 of the receiving coil and then connected in parallel with the secondary compensation capacitor C2; The secondary compensation capacitor C2 is connected to the input end of the rectifier circuit, and the output end of the rectifier circuit is connected to the resistive load R L ; The signal carrier source V c One end is connected to the inductor L p1 , and the signal carrier source V c The other end is connected to the capacitor C p1 , and the other end of the inductor L p1 is connected to the other end of the capacitor C p1 , and the other end of the inductor L p1 is also connected to the symbol transformation switch S1, and the other end of the symbol transformation switch S1 is connected to the coupling transformer winding L c2 is connected, and the other end of the coupling transformer winding L c2 is connected to the capacitor C p2 is connected, and the other end of the capacitor C p2 is connected to the capacitor C p1 is connected; The signal extraction resistor R s One end is connected to the inductor L s1 The other end of the signal extraction resistor R s is connected to the capacitor C s1 The other end of the inductor L s1 is connected to the other end of the capacitor C s1 One end of the capacitor C s2 is connected to the signal extraction resistor R s and the other end is connected to the coupling transformer winding L c4 The other end of the coupling transformer winding L c4 is connected to the inductor L s1 ​ 8. The series injection method for improving the co - transmission performance of wireless signal energy according to claim 1, wherein The power transmission circuit compensation structure adopts a series compensation topology, and the power receiving circuit compensation structure adopts a parallel compensation topology.

9. The series injection method for improving the co - transmission performance of wireless signal energy as claimed in claim 1, wherein The data transmission circuit compensation structure adopts an LCC compensation structure, and the data receiving circuit compensation structure adopts an LCC compensation topology.

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