CN118238641A - Electric field-magnetic field hybrid coupling mechanism and its energy-signal simultaneous transmission system in stereo garage - Google Patents

Abstract

The application provides an electric field-magnetic field hybrid coupling mechanism in a stereo garage and an energy communication and simultaneous transmission system thereof. The wireless power transmission system is used for solving the problem that the existing wireless power transmission system cannot meet the use requirement of the stereo garage. The three-dimensional garage comprises a plurality of parking modules which are arranged at equal intervals along the vertical direction, wherein the parking modules comprise metal car carrying plates, and the rear ends of the parking modules are provided with transmitting coils L _p; the bottom and the top of the vehicle to be charged are both provided with vehicle-mounted electrode plates, the rear part of the vehicle to be charged is provided with a receiving coil L _s, the two vehicle-mounted electrode plates respectively form two groups of electric field coupling modules with the metal vehicle-mounted plate for parking the vehicle to be charged and the metal vehicle-mounted plate of the parking module above the two vehicle-mounted electrode plates, and the transmitting coil L _p and the receiving coil L _s form a magnetic field coupling module. According to the structural characteristics of the stereo garage, the six-capacitor cross coupling model is built based on the vehicle carrying plate and is used as a signal transmission channel, and the magnetic field coupling module is used as an electric energy transmission channel. Thereby realizing full duplex transmission.

Description

Electric field-magnetic field hybrid coupling mechanism and its energy-signal simultaneous transmission system in stereo garage

Technical Field

The invention relates to the field of wireless power transmission, in particular to an electric field-magnetic field hybrid coupling mechanism in a stereo garage and an energy and signal simultaneous transmission system thereof.

Background Art

In recent years, with the increase in the number of electric vehicles in the world, the number of dedicated parking spaces for electric vehicles will increase day by day. Stereoscopic parking garages can effectively solve the contradiction between the area occupied by parking spaces and the limited land area. However, there are few stereoscopic parking garages for charging electric vehicles. Because the use of traditional wired charging methods will inevitably lead to the disorderly distribution of charging wires in the stereoscopic parking garage, which will bring a series of safety hazards. In addition, the wired charging method also requires the use of a manipulator to assist in the plug-in and unplug operation, which not only increases the size and weight of the stereoscopic parking garage, but also increases the charging cost of electric vehicles.

In recent years, wireless power transmission (WPT) technology has developed rapidly, and it has achieved a lot of research results in the field of electric vehicles. Electric vehicle wireless charging demonstration devices have been built in many places around the world. However, although the achievements of WPT technology in the field of electric vehicles are increasing, there are very few studies on wireless charging technology for electric vehicles in stereo garages. In the existing technology, wireless charging of electric vehicles in stereo garages uses magnetic field coupling wireless power transmission (MC-WPT) technology, and its charging coil is generally placed on the metal carrier plate, without considering the impact of the metal carrier plate on wireless charging. In fact, under the action of high-frequency alternating electromagnetic fields, large eddy current losses will be generated on the metal carrier plate, which will seriously affect the system output power, transmission efficiency and system safety.

Summary of the invention

The purpose of the present invention is to provide an electric field-magnetic field hybrid coupling mechanism and its energy and signal transmission system in a stereo garage, so as to solve the problem that the existing wireless power transmission system in the prior art cannot meet the use requirements of the stereo garage.

An electric field-magnetic field hybrid coupling mechanism in a stereo garage, the stereo garage comprises a plurality of parking modules arranged at equal intervals along a vertical direction, the plurality of parking modules all comprise a metal vehicle loading plate, and the rear ends of the plurality of parking modules are all provided with a transmitting coil _Lp ;

The bottom and top of the vehicle to be charged are both provided with on-board electrode plates, and the rear of the vehicle to be charged is provided with a receiving coil _Ls . The on-board electrode plates are all arranged in parallel with the metal vehicle-carrying plate. The two on-board electrode plates of the vehicle to be charged respectively form two groups of electric field coupling modules with the metal vehicle-carrying plate on which the vehicle to be charged is parked and the metal vehicle-carrying plate of the parking module above it, and the transmitting coil _Lp and the receiving coil _Ls form a magnetic field coupling module.

A simultaneous transmission system includes the above-mentioned electric field-magnetic field hybrid coupling mechanism in the stereo garage.

Optionally, it further includes an energy transmission circuit, wherein the energy transmission circuit includes a power supply module, a primary power conversion module, a secondary power conversion module and a load _RL ;

The input end of the primary power conversion module is connected to the power supply module, the output end of the primary power conversion module is connected to the transmitting coil _Lp , the input end of the secondary power conversion module is connected to the receiving coil _Ls , and the output end of the secondary power conversion module is connected to the load _RL .

Optionally, it further includes a signal transmission circuit, wherein the signal transmission circuit includes a primary side modulation and demodulation module and a secondary side modulation and demodulation module;

The primary side modulation and demodulation module is connected in series to one end of the transmitting coil L _p , and the metal vehicle loading plate on which the vehicle to be charged is parked and the metal vehicle loading plate of the parking module above it are connected to the other end of the transmitting coil L _p and the primary side modulation and demodulation module through the control switch S _i ;

The secondary side modulation and demodulation module is connected in series to one end of the receiving coil _Ls , and the vehicle-mounted electrode plates at the bottom and top of the vehicle to be charged are connected to the other end of the receiving coil _Ls and the secondary side modulation and demodulation module.

Optionally, the primary power conversion module includes a high-frequency inverter circuit, a primary LCC compensation circuit and a primary power high-frequency wave blocking network submodule;

The input end of the high-frequency inverter circuit is connected to the power module, the input end of the primary LCC compensation circuit is connected to the output end of the high-frequency inverter circuit, one end of the primary power high-frequency blocking network submodule is connected to one end of the primary LCC compensation circuit, and the other end of the primary power high-frequency blocking network submodule and the other end of the primary LCC compensation circuit are respectively connected to the two ends of the transmitting coil _Lp .

Optionally, the secondary side power conversion module includes a secondary side power compensation capacitor C _s , a rectifier circuit and a secondary side power high frequency wave blocking network submodule;

One end of the receiving coil _Ls is connected to an input end of the rectifier circuit, the other end of the receiving coil _Ls is connected to one end of the secondary power high-frequency wave blocking network submodule, the other end of the secondary power high-frequency wave blocking network submodule is connected to one end of the secondary power compensation capacitor _Cs , the other end of the secondary power compensation capacitor _Cs is connected to another input end of the rectifier circuit, and the output end of the rectifier circuit is connected to the load _RL .

Optionally, the primary power high-frequency wave-blocking network submodule includes a first primary power high-frequency wave-blocking network and a second primary power high-frequency wave-blocking network connected in series;

The secondary side power high frequency wave choke network submodule comprises a first secondary side power high frequency wave choke network and a second secondary side power high frequency wave choke network connected in series.

Optionally, the primary side modulation and demodulation module includes a primary side signal modulation submodule and a primary side signal demodulation submodule;

The primary signal modulation submodule and the primary signal demodulation submodule are connected in parallel, the primary signal modulation submodule includes a primary signal modulation circuit U _s1 and a first primary signal high-frequency blocking network connected in series, and the primary signal demodulation submodule includes a primary sampling resistor R _s1 and a second primary signal high-frequency blocking network connected in series.

Optionally, the secondary side modulation and demodulation module includes a secondary side signal modulation submodule and a secondary side signal demodulation submodule;

The secondary signal modulation submodule and the secondary signal demodulation submodule are connected in parallel, the secondary signal modulation submodule includes a secondary signal modulation circuit U _s2 and a first secondary signal high-frequency blocking network connected in series, and the secondary signal demodulation submodule includes a secondary sampling resistor R _s2 and a second secondary signal high-frequency blocking network connected in series.

Optionally, both the primary-side signal modulation circuit U _s1 and the secondary-side signal modulation circuit U _s2 adopt an on-off keying (OOK) method to modulate signals.

Due to the adoption of the above technical solution, the present invention has the following advantages:

According to the structural characteristics of the stereo garage, this application constructs a six-capacitor cross-coupling model based on the vehicle carrier and uses it as a signal transmission channel, and uses the magnetic field coupling mechanism as an electric energy transmission channel. Based on different carrier frequencies, an LC parallel resonant network is designed as a wave blocker to ensure that the signal of a given frequency can pass smoothly, while blocking the signal of another frequency without delay, thereby achieving full-duplex transmission.

Other advantages, objectives and features of the present invention will be described in the following description to some extent, and to some extent, will be obvious to those skilled in the art based on the following examination and study, or can be taught from the practice of the present invention. The objectives and other advantages of the present invention can be realized and obtained through the following description and claims.

BRIEF DESCRIPTION OF THE DRAWINGS

The accompanying drawings of the present invention are as follows.

FIG. 1 is a schematic diagram of a simultaneous transmission system for signals in a stereoscopic parking garage according to the present invention.

FIG. 2 is an equivalent circuit diagram of two groups of electric field coupling modules of the present invention.

FIG3 is a circuit topology diagram of the simultaneous interpretation system of the present invention.

FIG. 4 is a topological diagram of a power transmission circuit in a power transmission mode of the present invention.

FIG. 5 is a topological diagram of a signal forward transmission circuit in a signal transmission mode of the present invention.

FIG. 6 is a T-type decoupling equivalent circuit diagram of the forward transmission circuit in FIG. 5 of the present invention.

FIG. 7 is an equivalent circuit diagram of the crosstalk of electric energy to signals in the system of the present invention.

FIG8 is an equivalent circuit diagram of the forward transmission signal crosstalk of the system of the present invention.

FIG. 9 is a waveform diagram of the inverter output when only electric energy is transmitted in the system during the simulation of the present invention.

FIG. 10 is a load waveform diagram when only electric energy is transmitted in the system during simulation of the present invention.

FIG. 11 is a simulation waveform diagram of the present invention when the system has only signal transmission during simulation.

FIG. 12 is a signal waveform diagram of the synchronous transmission of system power and signal during the simulation of the present invention.

FIG. 13 is a crosstalk waveform diagram of system power on signal transmission during simulation of the present invention.

FIG. 14 is a diagram showing the crosstalk between U _s1 and R _s2 during the system signal transmission process during the simulation of the present invention.

FIG. 15 is a diagram showing the crosstalk of U _s2 to R _s1 during the system signal transmission process during the simulation of the present invention.

In the figure: 1-metal vehicle-carrying plate; 2-vehicle-carrying electrode plate.

DETAILED DESCRIPTION

The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

Embodiment 1:

As shown in FIG1 , an electric field-magnetic field hybrid coupling mechanism in a stereo garage comprises a plurality of parking modules arranged at equal intervals in the vertical direction, wherein the plurality of parking modules all comprise a metal vehicle loading plate 1, and a transmitting coil L _p is arranged at the rear end of the plurality of parking modules;

The bottom and top of the vehicle to be charged are both provided with vehicle-mounted electrode plates 2, and the rear of the vehicle to be charged is provided with a receiving coil _Ls . The vehicle-mounted electrode plates 2 are both arranged in parallel with the metal vehicle-mounting plate 1. The two vehicle-mounted electrode plates 2 of the vehicle to be charged respectively form two groups of electric field coupling modules with the metal vehicle-mounting plate 1 on which the vehicle to be charged is parked and the metal vehicle-mounting plate 1 of the parking module above it, and the transmitting coil _Lp and the receiving coil _Ls form a magnetic field coupling module.

In this embodiment, the stereo garage is a vertical rotating stereo garage, and an electric energy conversion device and a signal sending and receiving module are installed at the power supply end and the vehicle end respectively. The electric energy transmission channel is mainly composed of a magnetic field coupling module, and the signal transmission channel is composed of a magnetic field coupling coil and an electric field coupling electrode. Under the action of a high-frequency alternating electric field, two groups of electric field coupling modules constitute six cross-coupled capacitors as shown in FIG2(a). The six-capacitor cross-coupling model can be equivalent to a three-capacitor π model as shown in FIG2(b), and the three-capacitor π model can be equivalent to a three-capacitor T model as shown in FIG2(c).

Embodiment 2:

As shown in FIG. 1 and FIG. 3 , a simultaneous energy and signal transmission system includes the electric field-magnetic field hybrid coupling mechanism in the stereo garage described above; and also includes an energy transmission circuit, wherein the energy transmission circuit includes a power supply module, a primary power conversion module, a secondary power conversion module and a load _RL ;

The input end of the primary power conversion module is connected to the power supply module, the output end of the primary power conversion module is connected to the transmitting coil _Lp , the input end of the secondary power conversion module is connected to the receiving coil _Ls , and the output end of the secondary power conversion module is connected to the load _RL .

In this embodiment, the power module is a DC power supply U _dc , and the load _RL is a battery module of a vehicle to be charged.

As an embodiment of the present invention, it also includes a signal transmission circuit, and the signal transmission circuit includes a primary side modulation and demodulation module and a secondary side modulation and demodulation module;

The primary side modulation and demodulation module is connected in series to one end of the transmitting coil L _p , and the metal vehicle loading plate 1 on which the vehicle to be charged is parked and the metal vehicle loading plate 1 of the parking module above it are connected to the other end of the transmitting coil L _p and the primary side modulation and demodulation module through the control switch S _i ;

The secondary side modulation and demodulation module is connected in series to one end of the receiving coil _Ls , and the vehicle-mounted electrode plates 2 at the bottom and top of the vehicle to be charged are connected to the other end of the receiving coil _Ls and the secondary side modulation and demodulation module.

In this embodiment, as shown in FIG1 , the metal vehicle loading plate 1 on which the lowest vehicle to be charged is parked and the metal vehicle loading plate 1 of the parking module above it are connected to the other end of the transmitting coil L _p and the primary side modulation and demodulation module through control switches S ₁ and S ₂ , respectively. When the lowest vehicle to be charged needs to transmit a signal, the control switch S ₃ is disconnected and the control switches S ₁ and S ₂ are closed. When the vehicle to be charged on the second layer needs to transmit a signal, the control switch S ₂ is disconnected and S ₃ and S ₄ are closed, and so on.

As an embodiment of the present invention, the primary power conversion module includes a high-frequency inverter circuit, a primary LCC compensation circuit and a primary power high-frequency wave blocking network submodule;

The input end of the high-frequency inverter circuit is connected to the power module, the input end of the primary LCC compensation circuit is connected to the output end of the high-frequency inverter circuit, one end of the primary power high-frequency blocking network submodule is connected to one end of the primary LCC compensation circuit, and the other end of the primary power high-frequency blocking network submodule and the other end of the primary LCC compensation circuit are respectively connected to the two ends of the transmitting coil _Lp .

As an embodiment of the present invention, the secondary side power conversion module includes a secondary side power compensation capacitor C _s , a rectifier circuit and a secondary side power high frequency wave blocking network submodule;

One end of the receiving coil _Ls is connected to an input end of the rectifier circuit, the other end of the receiving coil _Ls is connected to one end of the secondary power high-frequency wave blocking network submodule, the other end of the secondary power high-frequency wave blocking network submodule is connected to one end of the secondary power compensation capacitor _Cs , the other end of the secondary power compensation capacitor _Cs is connected to another input end of the rectifier circuit, and the output end of the rectifier circuit is connected to the load _RL .

In this embodiment, as shown in FIG3 , the primary LCC compensation circuit includes an inductor L _f1 , a capacitor C _f1 and a capacitor C _p , the high-frequency inverter circuit is a high-frequency inverter composed of four MOSFET tubes S ₁ -S ₄ , and the rectifier circuit is composed of four rectifier bridge diodes D ₁ -D ₄ .

As an embodiment of the present invention, the primary power high-frequency wave-blocking network submodule includes a first primary power high-frequency wave-blocking network and a second primary power high-frequency wave-blocking network connected in series; the secondary power high-frequency wave-blocking network submodule includes a first secondary power high-frequency wave-blocking network and a second secondary power high-frequency wave-blocking network connected in series.

In this embodiment, the first primary power high-frequency wave choke network includes a capacitor C _t1 and an inductor L _t1 connected in parallel, the second primary power high-frequency wave choke network includes a capacitor C _t2 and an inductor L _t2 connected in parallel, the first secondary power high-frequency wave choke network includes a capacitor C _r1 and an inductor L _r1 connected in parallel, and the second secondary power high-frequency wave choke network includes a capacitor C _r2 and an inductor L _r2 connected in parallel.

As an embodiment of the present invention, the primary side modulation and demodulation module includes a primary side signal modulation submodule and a primary side signal demodulation submodule;

The primary signal modulation submodule and the primary signal demodulation submodule are connected in parallel, the primary signal modulation submodule includes a primary signal modulation circuit U _s1 and a first primary signal high-frequency blocking network connected in series, and the primary signal demodulation submodule includes a primary sampling resistor R _s1 and a second primary signal high-frequency blocking network connected in series.

As an embodiment of the present invention, the secondary side modulation and demodulation module includes a secondary side signal modulation submodule and a secondary side signal demodulation submodule;

The secondary signal modulation submodule and the secondary signal demodulation submodule are connected in parallel, the secondary signal modulation submodule includes a secondary signal modulation circuit U _s2 and a first secondary signal high-frequency blocking network connected in series, and the secondary signal demodulation submodule includes a secondary sampling resistor R _s2 and a second secondary signal high-frequency blocking network connected in series.

In this embodiment, the first primary signal high-frequency wave blocking network includes a capacitor _C2 and an inductor _L2 connected in parallel, the second primary power high-frequency wave blocking network includes a capacitor _C1 and an inductor _L1 connected in parallel, the first secondary power high-frequency wave blocking network includes a capacitor _C3 and an inductor _L3 connected in parallel, and the second secondary power high-frequency wave blocking network includes a capacitor _C4 and an inductor _L4 connected in parallel.

As an embodiment of the present invention, the primary signal modulation circuit U _s1 and the secondary signal modulation circuit U _s2 both use an on-off keying OOK modulation method to generate a signal carrier, and the principle thereof can be expressed as follows:

Where: A and _ωs are the amplitude and angular frequency of the carrier signal respectively. When the transmitted data is "1", the signal carrier is a sine wave. When it is "0", there is no carrier in the signal path.

In this embodiment, when only a single vehicle is considered for wireless charging, the circuit topology of the full-duplex wireless power and signal parallel transmission system is shown in FIG3. In the figure, U _dc is a DC input voltage, which is injected into the primary LCC compensation circuit after high-frequency inversion. The angular frequency of the inverter output voltage is ω (ω＝2πf). Under the action of the magnetic field coupling coil, power transmission is achieved. _{U s1} and U _s2 are the equivalent AC signal sources modulated by the power supply end and the vehicle end, respectively, and their angular frequencies are ω ₁ and ω ₂ (set ω ₁ <ω ₂ ), respectively. R _s1 and R _s2 are the signal sampling resistors of the vehicle end and the power supply end, respectively. Under the action of the electric field coupling electrode and the magnetic field coupling coil, full-duplex communication is achieved.

In this embodiment, the LC elements of the four sets of high-frequency wave-blocking networks (C _t1 , L _t1 ), (C _t2 , L _t2 ), (C _r1 , L _r1 ) and (C _r2 , L _r2 ) all satisfy the parallel resonance relationship, and their resonant angular frequencies are ω ₁ and ω ₂ respectively (ω ₁ =2πf ₁ ,ω ₂ =2πf ₂ ). It can effectively reduce the crosstalk of signals to electric energy and further improve the quality of electric energy. Similarly, the resonant frequencies of the four groups of high-frequency wave blocking networks (C ₁ , L ₁ ), (C ₂ , L ₂ ), (C ₃ , L ₃ ) and (C ₄ , L ₄ ) are also ω ₁ and ω ₂ respectively. Therefore, the signal source U _s1 with a frequency of ω ₁ cannot generate a response on the sampling resistor R _s2 , and the signal source U _s2 with a frequency of ω ₂ cannot generate a response on the sampling resistor R _s1 . Since in the magnetic field coupling power transmission mode, its operating angular frequency ω is much smaller than the signal transmission angular frequencies ω ₁ and ω ₂ , and the coupling capacitance formed by the metal vehicle plate 1 and the vehicle-mounted electrode plate 2 is extremely small (pF level), the capacitive reactance of the electric field coupling mechanism is very large and can be approximated as an open circuit. On the contrary, in the signal transmission mode, the electric field coupling mechanism serves as the main transmission channel.

The performance of the simultaneous interpretation system of this application is analyzed below.

S1.1 analyzes the performance of the power transmission mode system: In the power transmission mode, the electric field coupling mechanism can be regarded as an open circuit. In addition, since ω ₁ ,ω ₂ >>ω, then:

That is, the capacitors of the wave-blocking network can be regarded as open circuits. Therefore, the power transmission circuit can be equivalent to the LCC-S structure shown in Figure 4, where U _ac is the inverter output AC voltage, _Req is the AC equivalent load resistance (where: _Req = 8R _L /π ² ), _Lteq is the equivalent inductance of the wave-blocking network at the transmitting end (where: _{Lteq ≈Lt1} + _Lt2 ), _{and Lreq} is the equivalent inductance of the wave-blocking network at the receiving end ( _{Lreq ≈Lr1} + _Lr2 ). The circuit parameters satisfy the following resonance relationship:

From this we can conclude that the circuit input impedance is:

The transmitting coil current is:

The power transfer gain is further obtained as:

In practical applications, the system operating frequency, input voltage and coupling coil are given first, that is, ω, U _ac , L _p , L _s and M are known; according to the charging power requirement _Preq = (U _ac G _p ) ² / _Req in the application, the expression of the inductance L _f1 can be obtained as:

According to the resonant relationship between inductance and capacitance, it can be obtained that C _f1 =1/ω ² L _f1 . In the figure, the inductance L _teq and L _req and the capacitance C _p and C _s will be determined by designing the parameter relationship in the signal transmission mode and the crosstalk mode.

S1:2 Analyze the performance of the signal transmission mode system:

As shown in Figure 3, the structure of the signal transmission circuit is symmetrical, so the analysis methods of the forward transmission mode and the reverse transmission mode are consistent. This article only analyzes the forward transmission mode. In the forward transmission mode of the signal, according to the superposition principle, the signal source U _s2 can be regarded as a short circuit; under the action of the signal source U _s1 with a frequency of ω ₁ , (C _t1 ,L _t1 ), (C ₁ ,L ₁ ), (C _r1 ,L _r1 ), (C ₃ ,L ₃ ) are all open circuits, so the topology of the forward transmission circuit of the signal is shown in Figure 5. Combined with the equivalent transformation shown in Figure 2 and the decoupling equivalent principle of the coupling coil, the circuit shown in Figure 5 can be equivalent to the circuit shown in Figure 6, in which:

in:

Where _Cπ1 and _Cπ2 are the primary equivalent capacitance and the secondary equivalent capacitance in the equivalent π model, respectively; _CM is the mutual capacitance between the primary and secondary sides in the equivalent π model; Ci _,j is the capacitance between any two plates in the cross-coupling model, where: i,j＝1,2,3,4, and i≠j.

The circuit shown in Figure 6 is divided into two loops, the currents of the loops are I ₁ and I ₂ respectively, and the clockwise direction is defined as the positive direction. According to Kirchhoff's voltage law, the loop equation is listed as:

Where:

The loop current can be calculated as:

Therefore, the gain model of the signal during forward transmission can be expressed as:

S1:3 Analysis of the performance of the power crosstalk mode system:

Power crosstalk refers to the voltage response on the signal sampling resistor when only power input is considered. Power crosstalk gain is used to measure the impact of power transmission on signal transmission, and the smaller the value, the better. According to the structure shown in Figure 3, the power crosstalk model of the system can be equivalent to the circuit shown in Figure 7, in which:

The crosstalk of electric energy to the signal mainly comes from the voltage difference between the transmitting coil and the receiving coil. The impedance of the LC wave-blocking network in the figure is expressed as:

The circuit shown in Figure 3 is divided into two loops. The loop currents are I _c1 and I _c2 , and their directions are counterclockwise and clockwise respectively. The loop equations are listed according to Kirchhoff's law:

Where:

From this we can get the currents of the two circuits are:

Then the voltages across the sampling resistors Rs1 and Rs2 are:

S1:4 Analysis of the performance of the signal crosstalk mode system:

For the forward transmission of the signal, the crosstalk of the receiving end signal source U _s2 on R _s1 is mainly considered; for the reverse transmission of the signal, the crosstalk of the transmitting end signal source U _s1 on R _s2 is mainly considered; according to the symmetry of the circuit, the derivation method of the crosstalk model of the forward and reverse transmission of the signal is basically the same. When only U _s2 is considered, the signal crosstalk circuit can be equivalent to the structure shown in Figure 8.

When the frequency is ω ₂ , the impedance of the LC wave-blocking network in the figure is expressed as:

Therefore, the impedances of each level in the figure can be expressed as:

The crosstalk model of U _s2 on R _s1 can be expressed as:

S2 performs simulation analysis on the system:

The energy and signal transmission of a single vehicle to be charged in a stereo garage is simulated. Based on the Maxwell finite element simulation platform, simulation models of the magnetic field coupling module and the electric field coupling module are established respectively, and simulation analysis is performed to obtain the parameters of the relevant inductance and capacitance, as shown in Table 1.

Table 1 Electric field and magnetic field coupling module parameters

According to the above parameter design analysis, taking the wireless power transmission system with an operating frequency of 85kHz as an example, and selecting the primary compensation inductor _Lf1 = 10μH based on experience, and giving the resonant frequencies _ω1 and _ω2 of the parallel LC choke network as 2π*3* ¹⁰⁶ and 2π*2* ¹⁰⁶ respectively, the other parameters of each choke network and the circuit are given, as shown in Table 2.

Table 2 System parameters

The system is simulated based on the above parameters, and the simulation results are shown in Figures 9, 10, 11, 12, 13, 14 and 15. According to the inverter output waveform and load waveform when only power is transmitted in the system as shown in Figures 9 and 10, it can be inferred that the system output power is greater than 3.3kW.

The system shown in Figure 11 is a simulation waveform diagram under signal transmission only. The first waveform is the signal voltage at the transmitting end with a modulation frequency of 100kHz, and the second waveform is the signal voltage at the receiving end, with a modulation frequency of 100kHz. The latter two waveforms are the output signal waveforms of the receiving end and the transmitting end respectively.

As shown in Figure 12, the signal waveform diagram of the system when the electric energy and signal are transmitted synchronously. By comparing with Figure 11, it can be found that after the electric energy channel is added, the electric energy has a certain influence on the transmission of the signal, but the influence is not obvious. The latter two waveforms have a good correspondence with the former two waveforms, which means that the signal can be demodulated well. The reason is that the wave blocking network and electric field coupling mechanism designed in this paper play an isolation role.

To further illustrate the influence of electric energy on the signal, see the crosstalk waveform of electric energy on signal transmission shown in FIG13. It can be seen from FIG13 that the influence of electric energy on the signal can be ignored compared with the amplitude of the signal itself. FIG14 and FIG15 respectively show the crosstalk in the forward and reverse transmission of the signal. The crosstalk diagram of U _s1 to R _s2 in the signal transmission process shown in FIG14, the first waveform in FIG14 is the output on R _s1 under U _s1 input, and the second waveform is the crosstalk on R _s2 under U _s1 input; the crosstalk diagram of U _s2 to R _s1 in the signal transmission process shown in FIG15, the first waveform in FIG15 is the crosstalk on R _s1 under U _s2 input, and the second waveform is the output on R _s2 under U _s2 input; it can be seen from FIG14 and FIG15 that the crosstalk between the signals is very small and can be ignored. Through the above simulation analysis, it can be seen that the method and system proposed in this paper can ensure full-duplex synchronous transmission of electric energy and signals.

In summary, this application proposes a full-duplex electric energy and signal parallel wireless transmission system based on a hybrid electric field and magnetic field coupling mechanism for the application scenario of wireless charging in a stereo garage. The two signal carriers are based on OOK modulation and are transmitted synchronously with the power carrier through a single transformer coupling. The circuit parameter design methods in four cases, namely, power transmission mode, signal transmission mode, power crosstalk mode and signal crosstalk mode, are analyzed respectively, and the corresponding circuit simulation parameters are given. A system simulation model was established in MATLAB/Simulink, and the output power of 3.3kW and the maximum transmission rate of 200kb/s were achieved. At the same time, the transmission performance under various working modes was analyzed. The results show that the proposed system can better realize full-duplex parallel transmission of electric energy and signals, meeting the application scenario of wireless charging in stereo garages.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in the relevant field should understand that the specific implementation methods of the present invention can still be modified or replaced by equivalents, and any modifications or equivalent replacements that do not depart from the spirit and scope of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims (10)

1. The electric field-magnetic field hybrid coupling mechanism in the stereo garage comprises a plurality of parking modules which are arranged at equal intervals along the vertical direction, and is characterized in that the parking modules comprise metal car carrying plates (1), and the rear ends of the parking modules are provided with transmitting coils L _p;

The bottom and the top of waiting to charge the vehicle all are provided with on-vehicle electrode plate (2), and the rear portion of waiting to charge the vehicle is provided with receiving coil L _s, on-vehicle electrode plate (2) all with metal carries sweep (1) parallel arrangement, and two on-vehicle electrode plates (2) of waiting to charge the vehicle constitute two sets of electric field coupling modules with the metal that waits to charge the vehicle and carry sweep (1) and the metal that parks the module above thereof respectively, transmitting coil L _p constitutes magnetic field coupling module with receiving coil L _s.

2. An energy communication system, comprising the electric field-magnetic field hybrid coupling mechanism in the stereo garage of claim 1.

3. The energy co-transmission system of claim 2, further comprising an energy transfer circuit comprising a power module, a primary power conversion module, a secondary power conversion module, and a load R _L;

The input end of the primary side electric energy conversion module is connected with the power supply module, the output end of the primary side electric energy conversion module is communicated with the transmitting coil L _p, the input end of the secondary side electric energy conversion module is communicated with the receiving coil L _s, and the output end of the secondary side electric energy conversion module is communicated with the load R _L.

4. The energy co-transmission system of claim 2, further comprising a signal transmission circuit, wherein the signal transmission circuit comprises a primary side modem module and a secondary side modem module;

The primary side modem module is connected in series with one end of the transmitting coil L _p, and the metal vehicle carrying plate (1) for parking the vehicle to be charged and the metal vehicle carrying plate (1) of the parking module above the metal vehicle carrying plate are communicated with the other end of the transmitting coil L _p and the primary side modem module through the control switch S _i;

The secondary side modem module is connected in series with one end of the receiving coil L _s, and the vehicle-mounted electrode plates (2) at the bottom and the top of the vehicle to be charged are communicated with the other end of the receiving coil L _s and the secondary side modem module.

5. A power co-transmission system according to claim 3, wherein the primary side power conversion module comprises a high frequency inverter circuit, a primary side LCC compensation circuit and a primary side power high frequency choke network submodule;

The input end of the high-frequency inverter circuit is connected with the power supply module, the input end of the primary side LCC compensation circuit is connected with the output end of the high-frequency inverter circuit, one end of the primary side power high-frequency wave-blocking network sub-module is connected with one end of the primary side LCC compensation circuit, and the other end of the primary side power high-frequency wave-blocking network sub-module is respectively communicated with two ends of the transmitting coil L _p with the other end of the primary side LCC compensation circuit.

6. The energy co-transmission system according to claim 5, wherein the secondary side power conversion module comprises a secondary side power compensation capacitor C _s, a rectifying circuit and a secondary side power high-frequency choke network submodule;

One end of the receiving coil L _s is communicated with one input end of the rectifying circuit, the other end of the receiving coil L _s is communicated with one end of the secondary side power high-frequency wave-blocking network submodule, the other end of the secondary side power high-frequency wave-blocking network submodule is communicated with one end of the secondary side power compensation capacitor C _s, the other end of the secondary side power compensation capacitor C _s is communicated with the other input end of the rectifying circuit, and the output end of the rectifying circuit is communicated with the load R _L.

7. The energy co-transmission system according to claim 6, wherein the primary power high-frequency choke network submodule comprises a first primary power high-frequency choke network and a second primary power high-frequency choke network which are connected in series;

The secondary side power high-frequency wave-blocking network submodule comprises a first secondary side power high-frequency wave-blocking network and a second secondary side power high-frequency wave-blocking network which are connected in series.

8. The energy co-transmission system of claim 4, wherein the primary side modem module comprises a primary side signal modulation sub-module and a primary side signal demodulation sub-module;

The primary side signal modulation submodule is connected in parallel with the primary side signal demodulation submodule, the primary side signal modulation submodule comprises a primary side signal modulation circuit U _s1 and a first primary side signal high-frequency wave-blocking network which are connected in series, and the primary side signal demodulation submodule comprises a primary side sampling resistor R _s1 and a second primary side signal high-frequency wave-blocking network which are connected in series.

9. The energy co-transmission system of claim 8, wherein the secondary side modem module comprises a secondary side signal modulation sub-module and a secondary side signal demodulation sub-module;

The secondary side signal modulation submodule is connected in parallel with the secondary side signal demodulation submodule, the secondary side signal modulation submodule comprises a secondary side signal modulation circuit U _s2 and a first secondary side signal high-frequency wave-blocking network which are connected in series, and the secondary side signal demodulation submodule comprises a secondary side sampling resistor R _s2 and a second secondary side signal high-frequency wave-blocking network which are connected in series.

10. The energy co-transmission system of claim 9, wherein the primary side signal modulation circuit U _s1 and the secondary side signal modulation circuit U _s2 each modulate signals using an on-off keying OOK scheme.