Transmitting terminal device, receiving terminal device and dynamic wireless charging system

Abstract

The invention provides transmitting terminal equipment, receiving terminal equipment and a dynamic wireless charging system, and relates to the technical field of wireless charging. The transmitting terminal equipment comprises a splayed transmitting coil composed of a first solenoid structure coil and a second solenoid structure coil, and the first solenoid structure coil and the second solenoid structure coil are connected in series, are the same in structure and are both in a parallelogram shape; the short sides of a parallelogram formed by the first solenoid structure coil and the second solenoid structure coil are aligned on the Y axis and are parallel to the X axis, and the long sides of the parallelogram formed by the first solenoid structure coil and the second solenoid structure coil form a splayed structure and form a preset angle with the X axis; wherein the moving direction of the receiving coil unit serves as the X axis, and the Y axis is perpendicular to the X axis. According to the invention, the problems that the coupling coefficient is reduced and the output power fluctuates when the receiving coil unit advances to the transition area between the adjacent transmitting coil units can be improved, and the manufacturing difficulty and the manufacturing cost are considered at the same time.

Description

Technical Field

[0001] This invention relates to the field of wireless charging technology, and more particularly to a transmitter device, a receiver device, and a dynamic wireless charging system. Background Technology

[0002] Compared to traditional wired charging methods that involve direct plugging and unplugging, wireless charging offers advantages such as flexibility and less susceptibility to external environmental interference. With the continuous maturation of wireless charging technology, dynamic wireless charging technology has emerged. Dynamic wireless charging allows devices to charge while in motion, reducing the battery capacity required for extended battery life and making it widely applicable in electric vehicles, autonomous vehicles, and assembly line operations.

[0003] In dynamic wireless charging systems, there are two main types of transmitter coil track structures: long rail type and segmented type. The long rail type coupling mechanism is simple to control, but has lower system transmission efficiency. The segmented rail type can improve system transmission efficiency by switching the power supply of the transmitter coil units, preventing the transmitter coil units with low coupling to the receiver coil unit from being energized. However, in the segmented rail type, as the receiver coil unit moves, a decrease in coupling coefficient occurs when it reaches the transition area between adjacent transmitter coil units, causing fluctuations in output power. This problem can be mitigated through the structural and shape design of the coupling coil. For example, Chinese Patent CN118571616A, published on August 30, 2024, discloses a dynamic wireless charging penetrating transmitter coil and its parameter design method, which presents a novel transmitter coil structure. A compensation coil can reduce the drop in coupling coefficient when the receiver coil unit passes through the transition area between adjacent transmitter coil units. However, the protruding and recessed designs of the transmitter coil unit and the compensation coil require precision machining, increasing manufacturing difficulty. For example, Chinese patent CN118991472A, published on November 22, 2024, discloses a dynamic wireless charging system for electric vehicles based on segmented series connection of transmitting coils. It discloses a transmitting coil structure based on segmented series connection of transmitting coils, with the transmitting coil unit adopting a rectangular structure design. However, in the case of long-distance installation of transmitting coil units, the coil weight and cost are relatively high. Summary of the Invention

[0004] This invention provides a transmitter device, a receiver device, and a dynamic wireless charging system to address the problem that dynamic wireless charging systems cannot simultaneously address the issues of reduced coupling coefficient and output power fluctuations when the receiving coil unit moves to the transition region between adjacent transmitting coil units, while also considering manufacturing difficulty and cost.

[0005] In a first aspect, embodiments of the present invention provide a transmitting device, including: a figure-eight shaped transmitting coil; The figure-eight shaped transmitting coil includes a first solenoid structure coil and a second solenoid structure coil, which are connected in series. The first and second solenoid structure coils have identical structures and are both parallelograms. The short sides of the parallelograms formed by the first and second solenoid structure coils are aligned on the Y-axis. The long sides of the parallelograms formed by the first and second solenoid structure coils form a figure-eight structure. The direction of movement of the receiving coil unit is taken as the X-axis, and the Y-axis is perpendicular to the X-axis. In use, the short sides of the parallelogram formed by the first solenoid coil and the second solenoid coil are both parallel to the X-axis, and the long sides of the parallelogram formed by the first solenoid coil and the second solenoid coil are both at a preset angle to the X-axis.

[0006] In one possible implementation, the preset angle is 45°.

[0007] In one possible implementation, the transmitting device further includes: a transmitting compensation network and an inverter; The figure-eight shaped transmitting coil is connected to the inverter through the transmitting end compensation network; The inverter is used to connect to the DC bus.

[0008] In one possible implementation, the transmitter compensation network includes a series compensation capacitor, a parallel compensation capacitor, and a compensation inductor; The figure-eight shaped transmitting coil is connected in series with the series compensation capacitor, and the circuit after the figure-eight shaped transmitting coil and the series compensation capacitor are connected in series is called the first circuit; The first circuit is connected in parallel with the parallel compensation capacitor, and the circuit after the first circuit and the parallel compensation capacitor are connected in parallel is called the second circuit; The second circuit is connected to the inverter via the compensation inductor.

[0009] In a second aspect, embodiments of the present invention provide a receiving device that is used in conjunction with the transmitting device described in the first aspect or any possible implementation of the first aspect, the receiving device comprising: a stacked DD receiving coil; The stacked DD receiving coil includes a first D-shaped coil and a second D-shaped coil with the same structure, and the straight edges of the first D-shaped coil and the second D-shaped coil are stacked. The inner diameter of the long side of the stacked DD receiving coil is longer than the length of the figure-eight transmitting coil in the transmitting device by a first preset value, and the inner diameter of the short side of the stacked DD receiving coil is wider than the width of the figure-eight transmitting coil in the transmitting device by a second preset value. The long side of the stacked DD receiving coil is the straight side of either the first D-shaped coil or the second D-shaped coil. The short side of the stacked DD receiving coil is perpendicular to the long side of the stacked DD receiving coil. The length of the figure-eight transmitting coil is its length on the X-axis, and the width of the figure-eight transmitting coil is its length on the Y-axis. In use, the long side of the stacked DD receiving coil is set parallel to the length direction of the figure-eight transmitting coil.

[0010] In one possible implementation, the receiving device further includes: a receiving compensation network and a rectifier; The stacked DD receiving coil is connected to the rectifier through the receiving end compensation network; The rectifier is used to connect the load.

[0011] In one possible implementation, the receiver compensation network includes a receiver compensation capacitor; The stacked DD receiving coil is connected to the rectifier through the receiving end compensation capacitor.

[0012] Thirdly, embodiments of the present invention provide a dynamic wireless charging system, including a plurality of transmitting end devices as described in the first aspect or any possible implementation of the first aspect, and a receiving end device as described in the second aspect or any possible implementation of the second aspect; The plurality of transmitting devices are arranged along the target path, and the spacing between two adjacent figure-eight transmitting coils in the plurality of transmitting devices is the same as the spacing between the short side of the parallelogram formed by the first solenoid structure coil and the short side of the parallelogram formed by the second solenoid structure coil. The receiving device is mounted on the moving target moving along the target path, and the straight line containing the center point of the stacked DD receiving coil in the receiving device in the Y-axis direction is perpendicular to the first... i The figure-eight shaped transmitting coil and the first i When the center points of the +1 figure-eight shaped transmitting coils coincide on the straight line along the Y-axis, the first... i -1 The figure-eight shaped transmitting coil is de-energized, the... i The figure-eight shaped transmitting coil, the first i +1 figure-eight transmitting coil and the first i +2 figure-eight shaped transmitting coils are energized.

[0013] In one possible implementation, the length of the short side of the parallelogram formed by the first solenoid coil, the length of the long side of the parallelogram formed by the first solenoid coil, the spacing between the short side of the parallelogram formed by the first solenoid coil and the short side of the parallelogram formed by the second solenoid coil are determined according to the installation position and installation space of the figure-eight transmitting coil on the target path. The second preset value, in which the inner diameter of the short side of the stacked DD receiving coil is wider than the width of the figure-eight transmitting coil, is determined based on the offset required by the moving target. The number of turns and the turn spacing of the first solenoid structure coil, the number of turns and the core width of the stacked DD receiving coil are optimized based on the required self-inductance of the figure-eight transmitting coil and the required self-inductance of the stacked DD receiving coil.

[0014] In one possible implementation, the capacitance values ​​of the series compensation capacitor, the parallel compensation capacitor, and the compensation inductor in the transmitting device, as well as the capacitance value of the receiving compensation capacitor in the receiving device, are determined based on the required self-inductance value of the figure-eight transmitting coil, the required self-inductance value of the stacked DD receiving coil, and the system operating frequency.

[0015] This invention provides a transmitter device, a receiver device, and a dynamic wireless charging system. Because the transmitter coil unit is designed as a figure-eight transmitter coil composed of a first solenoid structure coil and a second solenoid structure coil, the spacing between two adjacent transmitter coil units can be made the same as the spacing between the first and second solenoid structure coils in the figure-eight transmitter coil when constructing the dynamic wireless charging system. This creates a transmitter guide rail with overall continuous symmetry, thereby improving the problems of reduced coupling coefficient and output power fluctuation when the receiver coil unit moves to the transition region between adjacent transmitter coil units. Furthermore, the simple structure of the figure-eight transmitter coil also balances manufacturing difficulty and cost. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the figure-eight transmitting coil in the transmitting device provided in an embodiment of the present invention; Figure 2 This is a schematic diagram of the circuit structure of a dynamic wireless charging system based on a figure-eight transmitting coil provided in an embodiment of the present invention; Figure 3 This is a schematic diagram of the structure of the stacked DD receiving coil provided in an embodiment of the present invention; Figure 4This is a schematic diagram of the switching power supply of the transmitting coil unit when the receiving coil unit moves in the dynamic wireless charging system provided in this embodiment of the invention. Figure 5 This is a schematic diagram of the mutual inductance simulation results when the receiving coil unit is in different positions according to an embodiment of the present invention; Figure 6 This is a schematic diagram illustrating the implementation process of the dynamic wireless charging system provided in this embodiment of the invention. Detailed Implementation

[0017] To enable those skilled in the art to better understand this solution, the technical solutions in the embodiments of this solution will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this solution, not all of them. Based on the embodiments of this solution, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of this solution.

[0018] The term "comprising" and any other variations thereof in the specification, claims, and accompanying drawings of this invention mean "including but not limited to," and are intended to cover a non-exclusive inclusion, not limited to the examples listed herein. Furthermore, the terms "first" and "second," etc., are used to distinguish different objects, not to describe a specific order.

[0019] The implementation of the present invention will be described in detail below with reference to the accompanying drawings: Figure 1 This is a schematic diagram of the structure of a figure-eight transmitting coil in a transmitting device provided in an embodiment of the present invention. (Refer to...) Figure 1 The transmitting device includes a figure-eight shaped transmitting coil.

[0020] The figure-eight transmitting coil includes a first solenoid structure coil and a second solenoid structure coil, which are connected in series. The first and second solenoid structure coils have the same structure and are both parallelograms. The short sides of the parallelograms formed by the first and second solenoid structure coils are aligned on the Y-axis. The long sides of the parallelograms formed by the first and second solenoid structure coils form a figure-eight structure. The direction of movement of the receiving coil unit is taken as the X-axis, and the Y-axis is perpendicular to the X-axis.

[0021] In use, the short sides of the parallelogram formed by the first solenoid coil and the second solenoid coil are both parallel to the X-axis, and the long sides of the parallelogram formed by the first solenoid coil and the second solenoid coil are both at a preset angle to the X-axis.

[0022] Combination Figure 1 and Figure 4 As shown, based on the principle of segmented guide rail structure, this embodiment designs a single transmitting coil unit and then arranges multiple transmitting coil units in a regular manner to form the transmitting rail of a complete dynamic wireless charging system.

[0023] like Figure 1 As shown, in this embodiment, a single transmitting coil unit is designed as a figure-eight structure coil, referred to as a figure-eight transmitting coil. The figure-eight structure can be either a regular figure-eight or an inverted figure-eight structure. A single figure-eight transmitting coil consists of two parts, both of which are solenoid structure coils (i.e., a first solenoid structure coil and a second solenoid structure coil), symmetrical along the Y-direction. Here, gap is the turn spacing of the solenoid structure coils, both coils have the same number of turns (n), and the minimum distance between the magnetic cores of the two coils is d. N and S are the magnetic poles generated by the solenoid structure coils after current is applied. Taking the positive X-axis as the direction of the target path (e.g., the road traveled by an electric vehicle), after current is applied, according to the right-hand screw rule, the same magnetic poles generated by the two coils will be distributed on the same side of the target path. The short side of the magnetic core (i.e., the short side of the parallelogram formed by the solenoid structure coils) is parallel to the X-axis, and the width of the magnetic core is... W , W C Let be the length of the magnetic core along the X-axis. For example, the magnetic core can form a 45° angle with the X-axis, and the length of the magnetic core is . L , L C for L The length mapped onto the X-axis, L S for L Length mapped to the Y-axis L t This is the length of the figure-eight transmitting coil on the X-axis.

[0024] based on Figure 1 The dimensional and structural relationships of a single figure-eight shaped transmitting coil, or a single transmitting coil unit, can be obtained as follows: (1) (2) In this embodiment, the transmitting rail of the dynamic wireless charging system is composed of several transmitting coil units. Each transmitting coil unit is a figure-eight transmitting coil, which consists of two parts, both of which are solenoid coils. They are axially symmetrical along the Y direction, with the two solenoid coils having the same winding direction but different current directions. This ensures that the same magnetic poles generated by the two coil parts are distributed on the same side of the transmitting coil unit. Overall, the transmitting coil unit has bipolar characteristics. The specific structural design rules can be as follows: Figure 1 Formula (1). When the transmitting rail is composed of transmitting coil units, the distance between adjacent transmitting coil units is the same as the distance between the two solenoid coils inside the transmitting coil unit, giving the transmitting rail continuous symmetry. Thus, the transmitting coil units have a symmetrical structure on the entire moving track of the receiving coil unit (i.e., the transmitting rail), making the mutual inductance fluctuation between the receiving coil unit and the transmitting coil unit smooth during the movement of the receiving coil unit, thereby effectively suppressing the fluctuation of the system output power. Moreover, the transmitting coil unit adopts an eight-shaped structure design, which effectively reduces the area and cost of the wires and magnetic sheets used compared to a rectangular coil of the same length.

[0025] For example, such as Figure 2 As shown, the transmitting equipment may also include: a transmitting compensation network and an inverter.

[0026] The figure-eight shaped transmitting coil is connected to the inverter via a transmitting end compensation network, and the inverter is used to connect to the DC bus.

[0027] For example, the transmitter compensation network may include series compensation capacitors. C ps(a) Parallel compensation capacitors C pp(a) and compensating inductor L fp(a) , where a= i -1、 i and i +1.

[0028] Figure-eight transmitting coil and series compensation capacitor C ps(a) The circuit consisting of the figure-eight transmitting coil and the series compensation capacitor is referred to as the first circuit.

[0029] First circuit and parallel compensation capacitor C pp(a) The circuits are connected in parallel, and the circuit formed by connecting the first circuit and the parallel compensation capacitor in parallel is called the second circuit.

[0030] The second circuit compensates for the inductance. L fp(a) Connect to the inverter.

[0031] Another embodiment of the present invention provides a receiving end device. This receiving end device is used in conjunction with the above-described transmitting end device, as described below. Figure 3 The receiving device includes a stacked DD receiving coil.

[0032] The stacked DD receiving coil includes a first D-shaped coil and a second D-shaped coil with the same structure, and the straight edges of the first D-shaped coil and the second D-shaped coil are stacked.

[0033] The inner diameter of the long side of the stacked DD receiving coil is longer than the length of the figure-eight transmitting coil in the transmitting device by a first preset value, and the inner diameter of the short side of the stacked DD receiving coil is wider than the width of the figure-eight transmitting coil in the transmitting device by a second preset value. The long side of the stacked DD receiving coil is the straight side of either the first D-shaped coil or the second D-shaped coil. The short side of the stacked DD receiving coil is perpendicular to the long side of the stacked DD receiving coil. The length of the figure-eight transmitting coil is the length of the figure-eight transmitting coil on the X-axis, and the width of the figure-eight transmitting coil is the length of the figure-eight transmitting coil on the Y-axis.

[0034] In use, the long side of the stacked DD receiving coil is set parallel to the length direction of the figure-eight transmitting coil.

[0035] In this embodiment, the receiving coil unit in the receiving device is designed. The receiving coil unit adopts a stacked DD coil structure. The structural diagram of the receiving coil unit and the transmitting coil unit when there is no offset in the direction perpendicular to the movement is shown below. Figure 3 As shown. The stacked DD receiving coil can be equivalently represented by two D-shaped coils (i.e., a first D-shaped coil and a second D-shaped coil), with currents flowing in opposite directions in the two coils. The adjacent linewidth regions of the two D-shaped coils are stacked, with the stack width being equal to the winding width of the D-shaped coil. L coil ; L r2 This refers to the outer diameter of the longer side of the stacked DD receiving coil. L r1 This refers to the inner diameter of the longer side of the stacked DD receiving coil. W R This refers to the length of the short side outer diameter of the stacked DD receiving coil; W d1 The inner diameter of the short side of each D-shaped coil that makes up the stacked DD receiving coil, W d2 The width of the short side outer diameter of each D-shaped coil that makes up the stacked DD receiving coil; L d This is the offset distance that does not affect the smoothness characteristics of mutual inductance in the direction perpendicular to the direction of movement.

[0036] based on Figure 2 The relationships between the dimensional parameters in the stacked DD receiving coil can be obtained as follows: (3) The relationship between the dimensions of the receiving coil unit and the transmitting coil unit is as follows: (4) For example, in combination Figure 2 The receiving equipment may also include: a receiving compensation network and a rectifier.

[0037] The stacked DD receiving coil is connected to the rectifier through the receiving end compensation network, and the rectifier is used to connect the load.

[0038] For example, the receiver compensation network may include a receiver compensation capacitor.

[0039] The stacked DD receiving coil is connected to the rectifier through the receiving end compensation capacitor.

[0040] In this embodiment, the receiving coil unit in the receiving device adopts a stacked DD receiving coil structure, which can be equivalent to being composed of two D-shaped coils. The adjacent linewidth regions of the two D-shaped coils are stacked, and the stack width is the winding width of the D-shaped coil. The length of the stacked DD receiving coil is the sum of the length of one transmitting coil unit along the moving direction, the spacing between the two solenoid coils inside the transmitting coil unit, and twice the winding width of the D-shaped coil. The width of the stacked DD receiving coil is the sum of the length of the transmitting coil unit perpendicular to the moving direction, twice the winding width of the D-shaped coil, and twice the offset distance. The specific design rules can be as follows: Figure 2 As shown in equations (3) and (4).

[0041] Another embodiment of the present invention provides a dynamic wireless charging system. (See also...) Figure 2 and Figure 4 The dynamic wireless charging system includes multiple transmitter devices and one receiver device.

[0042] Multiple transmitting devices are arranged along the target path, and the spacing between two adjacent figure-eight transmitting coils in the multiple transmitting devices is the same as the spacing between the short sides of the parallelogram formed by the first solenoid structure coil and the short sides of the parallelogram formed by the second solenoid structure coil.

[0043] The receiving device is positioned on the moving target along the target path, and the straight line containing the center point of the stacked DD receiving coil in the receiving device along the Y-axis is perpendicular to the first... i The figure-eight shaped transmitting coil and the first iWhen the center points of the +1 figure-eight shaped transmitting coils coincide on the straight line along the Y-axis, the first... i -1 The figure-eight shaped transmitting coil is de-energized, the... i The figure-eight shaped transmitting coil, the first i +1 figure-eight transmitting coil and the first i +2 figure-eight shaped transmitting coils are energized.

[0044] like Figure 4 As shown, the transmitting unit (i.e., the transmitting coil unit or the figure-eight transmitting coil) i -1. Transmission Unit i Launching unit i +1 and the transmitting unit i +2 The shape, structure, self-inductance, and internal resistance parameters are all the same, and the transmitting unit is... i Launching unit i +1 and the transmitting unit i The spacing between +2 is the same as the spacing of the magnetic cores inside the figure-eight transmitting coil, both being d, to maintain the overall continuous symmetry of the transmitting rail. For the magnetic field of the transmitting coil on the transmitting rail, one magnetic field period τ is equal to the length of one figure-eight transmitting coil on the X-axis. L t The sum of the distance d between the receiving coil unit and the transmitting unit. Figure 4 At the initial position shown in (a), the transmitting unit i -1. Transmission Unit i and launching unit i +1 power on, transmitting unit i +2 Off; As the receiving coil unit moves, when the receiving coil unit is in Figure 4 The position shown in (b) is the center point of the receiving coil unit and the transmitting unit. i and launching unit i When the center points of the +1 interval are on the same vertical line (that is, the straight line containing the center point of the stacked DD receiving coil in the receiving equipment along the Y-axis direction is the same as the first...), i The figure-eight shaped transmitting coil and the first i When the center points of the +1 figure-eight shaped transmitting coils coincide on the straight line along the Y-axis, the transmitting unit... i -1 shutdown, transmission unit i +2 is powered on to complete the power switching of the transmitting coil unit in the launch track.

[0045] Specifically, in combination Figure 2 As shown, that is: the stacked DD receiving coil in the receiving device is Figure 4 At the initial position shown in (a), with the transmitting unit i -1. Transmission Unit i and launching unit iThe inverter connected to +1 is turned on, connecting to the transmitting unit. i The inverter connected to +2 is turned off; as the receiving equipment moves, when the cascaded DD receiving coil in the receiving equipment is in... Figure 4 At the position shown in (b), with the transmitting unit i The inverter connected to +2 is turned on, connecting to the transmitting unit. i The inverter connected to -1 is turned off, completing the power-on switching of the transmitting coil unit in the transmitting track.

[0046] Combination Figure 2 and Figure 4 At any given time, only three adjacent transmitting coil units are turned on. Each transmitting coil unit is driven by an inverter, and an LCC topology can be used for the compensation network design between the inverters and the transmitting coil units. All inverter inputs are connected in parallel to the same DC bus, U DC This is the voltage of the DC bus; each inverter consists of 4 MOSFETs, namely MOSFET V1. a V2 a V3 a and V4 a Constructing inverter a (a= i -1、 i and i +1). Compensating inductor L fp(a) Parallel compensation capacitors C pp(a) Series compensation capacitor C ps(a) Composition and transmitting coil unit a (a= i -1、 i and i +1) Connected LCC compensation network, L P(a) and r p(a) Let A and B be the self-inductance and internal resistance of the transmitting coil unit A, respectively. M P(i-1),(i) and M P(i),(i+1) Each is a transmitting coil unit. i -1 and transmitting coil unit i Mutual inductance and transmitting coil unit i and transmitting coil unit i +1 mutual induction. L S and r S These are the self-inductance and internal resistance of the receiving coil unit, respectively. M P(a),S The mutual inductance is between the transmitting coil unit a and the receiving coil unit. CSS The receiving end compensation capacitor is composed of diodes D1, D2, D3, and D4. R L For load resistance, I P(a) Let be the current in transmitting coil unit a.

[0047] Among them, the self-inductance and internal resistance values ​​of different transmitting coil units are the same, and the parameters of the LCC compensation network connected to different transmitting coil units are also the same, that is... , , , , Define the system operating frequency as... The parameters of the compensation network and the self-inductance parameters of the coil satisfy equation (5), where a = i -1、 i and i +1.

[0048] (5) The effective values ​​of the current in the transmitting coil element can be obtained using the fundamental frequency approximation: (6) Therefore, the current of the receiving coil unit can be obtained. and output power for: (7) in, This is an intermediate variable, referring to the rectifier input impedance.

[0049] The total input power of the three transmitting coil units is: (8) The transmission efficiency of the dynamic wireless charging system is: (9) As shown in equations (7) and (9), the transmission efficiency and output power are related to parameters such as load resistance, mutual inductance between the transmitting coil unit and the receiving coil unit, and internal resistance of the transmitting coil unit and the receiving coil unit. After the system design is completed, the mutual inductance between the transmitting coil unit and the receiving coil unit remains stable during the movement of the receiving coil unit to maintain system efficiency and output power. Since the figure-eight transmitting coil structure proposed in this embodiment can maintain stable mutual inductance during the movement of the receiving coil unit, the dynamic wireless charging system based on this transmitting coil unit has stable output power and transmission efficiency.

[0050] To further illustrate the mutual inductance stability characteristics of the proposed figure-eight transmitting coil structure, a specific case study is presented below. The dimensional parameters of the receiving coil unit and transmitting coil unit obtained according to the above design method are shown in Tables 1 and 2, respectively.

[0051] Table 1 Relevant parameters of the receiving coil unit

[0052] Table 2 Relevant parameters of the transmitting coil unit

[0053] The mutual inductance between the transmitting rail (composed of transmitting coil units) and the receiving coil unit was simulated, and the simulation results of the mutual inductance when the receiving coil unit is in different positions are as follows: Figure 5 As shown, by Figure 5 It can be seen that when the receiving coil unit has an offset distance perpendicular to the direction of movement, the larger the offset distance, the smaller the mutual inductance value. However, under different offset distances, the mutual inductance fluctuation between the receiving coil unit and the transmitting coil unit during movement is very small, with a maximum mutual inductance difference of 0.2uH and a maximum fluctuation rate (maximum mutual inductance difference / maximum mutual inductance value) of less than 0.9%, which can be considered almost as small as zero fluctuation. Therefore, the dynamic wireless charging system provided in this embodiment has stable output power and transmission efficiency.

[0054] For example, the length of the short side of the parallelogram formed by the first solenoid coil, the length of the long side of the parallelogram formed by the first solenoid coil, the spacing between the short side of the parallelogram formed by the first solenoid coil and the short side of the parallelogram formed by the second solenoid coil are determined according to the installation position and installation space of the figure-eight transmitting coil on the target path.

[0055] The second preset value, in which the inner diameter of the short side of the stacked DD receiving coil is wider than the width of the figure-eight transmitting coil, is determined based on the offset required by the moving target.

[0056] The number of turns and the turn spacing of the first solenoid structure coil, as well as the number of turns and the core width of the stacked DD receiving coil, are optimized based on the required self-inductance values ​​of the figure-eight transmitting coil and the stacked DD receiving coil.

[0057] For example, the capacitance values ​​of the series compensation capacitor, the parallel compensation capacitor, and the compensation inductance in the transmitting device, as well as the capacitance value of the receiving compensation capacitor in the receiving device, are determined based on the required self-inductance value of the figure-eight transmitting coil, the required self-inductance value of the stacked DD receiving coil, and the system operating frequency.

[0058] like Figure 6 As shown, the implementation process of a dynamic wireless charging system may include: Step 1: Determine the length of the magnetic core of the transmitting coil unit based on the installation position of the transmitting rail and the installation space. L Core width W And the minimum distance d between the magnetic cores inside the transmitting coil unit.

[0059] Step 2: Set the initial values ​​for the number of turns and the initial value for the turn spacing of the transmitting coil unit, according to... Figure 1 The diagram shows the size and structure of the transmitting coil unit, and the structural parameters of the transmitting coil unit are designed using equations (1) and (2).

[0060] Step 3: Determine the required offset distance for the receiving coil unit based on application needs (i.e., the offset required to move the target). L d Meanwhile, the initial values ​​of the winding width and number of turns of the receiving coil are set, and the structural dimension parameters of the receiving coil unit are designed according to the structural dimension parameter constraints of the receiving coil unit and the transmitting coil unit shown in equations (3) and (4).

[0061] Step 4: Using the winding width and number of turns of the receiving coil, and the winding turns and turn spacing of the transmitting coil unit as optimization variables, and the self-inductance values ​​of the receiving coil unit and the transmitting coil unit required by the design as optimization targets, the winding width and number of turns of the receiving coil, and the winding turns and turn spacing of the transmitting coil unit are optimized using finite element simulation software.

[0062] Step 5: Based on the optimization results obtained in Step 3, and the structural dimension parameters of the receiving coil unit and the transmitting coil unit, complete the design of the receiving coil unit and the transmitting coil unit.

[0063] Step Six: Select the system operating frequency. Based on the self-inductance values ​​of the receiving coil unit and the transmitting coil unit, complete the design of the compensation network parameters according to equation (5). Figure 4 Connect the circuit and power on the dynamic wireless charging system according to the circuit structure diagram shown.

[0064] Step 7: During the movement of the receiving coil unit, when the receiving coil unit is in the transmitting unit i -1 and the launch unit i When above, with the launching unit i -1. Transmission Unit i and launching unit i The inverter connected to +1 is turned on, connecting to the transmitting unit. i The inverter connected to +2 is turned off; when the center point of the receiving coil unit is aligned with the transmitting unit... i and launching unit i When the center points of the +1 interval are on the same vertical line, and the transmitting unit i The inverter connected to +2 is turned on, connecting to the transmitting coil unit.i -1 The inverter connected to the circuit is turned off, completing the energization switching of the transmitter coil track coil unit.

[0065] This embodiment provides a dynamic wireless charging system based on a figure-eight transmitting coil. The system's receiving coil unit adopts a stacked DD receiving coil structure, and the transmitting coil unit adopts a figure-eight symmetrical structure. It has the following advantages: 1) The figure-eight structure design of the transmitting coil unit effectively reduces the area and cost of wires and magnetic sheets compared to a rectangular coil of the same length. 2) The transmitting coil unit has a symmetrical structure along the entire moving track of the receiving coil unit. During movement, the mutual inductance fluctuation between the receiving and transmitting coil units is stable, effectively suppressing fluctuations in the system's output power. 3) The stacked DD receiving coil structure of the receiving coil unit enhances the anti-offset characteristics of the receiving coil perpendicular to the moving direction. 4) In this embodiment, the components of each transmitting coil unit along the entire transmitting guide rail are structurally identical. When one transmitting coil unit is damaged, a portion of the transmitting coil unit can be directly replaced, facilitating subsequent installation, repair, and replacement, effectively saving maintenance costs.

[0066] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A transmitting device, characterized in that, include: Figure-eight shaped transmitting coil; The figure-eight shaped transmitting coil includes a first solenoid structure coil and a second solenoid structure coil, which are connected in series. The first and second solenoid structure coils have identical structures and are both parallelograms. The short sides of the parallelograms formed by the first and second solenoid structure coils are aligned on the Y-axis. The long sides of the parallelograms formed by the first and second solenoid structure coils form a figure-eight structure. The direction of movement of the receiving coil unit is taken as the X-axis, and the Y-axis is perpendicular to the X-axis. In use, the short sides of the parallelogram formed by the first solenoid coil and the second solenoid coil are both parallel to the X-axis, and the long sides of the parallelogram formed by the first solenoid coil and the second solenoid coil are both at a preset angle to the X-axis.

2. The transmitting device as described in claim 1, characterized in that, The preset angle is 45°.

3. The transmitting device as described in claim 1, characterized in that, Also includes: Transmitter compensation network and inverter; The figure-eight shaped transmitting coil is connected to the inverter through the transmitting end compensation network; The inverter is used to connect to the DC bus.

4. The transmitting device as described in claim 3, characterized in that, The transmitter compensation network includes a series compensation capacitor, a parallel compensation capacitor, and a compensation inductor. The figure-eight shaped transmitting coil is connected in series with the series compensation capacitor, and the circuit after the figure-eight shaped transmitting coil and the series compensation capacitor are connected in series is called the first circuit; The first circuit is connected in parallel with the parallel compensation capacitor, and the circuit after the first circuit and the parallel compensation capacitor are connected in parallel is called the second circuit; The second circuit is connected to the inverter via the compensation inductor.

5. A receiving device, characterized in that, When used in conjunction with the transmitting device as described in any one of claims 1 to 4, the receiving device includes: a stacked DD receiving coil; The stacked DD receiving coil includes a first D-shaped coil and a second D-shaped coil with the same structure, and the straight edges of the first D-shaped coil and the second D-shaped coil are stacked. The inner diameter of the long side of the stacked DD receiving coil is longer than the length of the figure-eight transmitting coil in the transmitting device by a first preset value, and the inner diameter of the short side of the stacked DD receiving coil is wider than the width of the figure-eight transmitting coil in the transmitting device by a second preset value. The long side of the stacked DD receiving coil is the straight side of either the first D-shaped coil or the second D-shaped coil. The short side of the stacked DD receiving coil is perpendicular to the long side of the stacked DD receiving coil. The length of the figure-eight transmitting coil is its length on the X-axis, and the width of the figure-eight transmitting coil is its length on the Y-axis. In use, the long side of the stacked DD receiving coil is set parallel to the length direction of the figure-eight transmitting coil.

6. The receiving device as described in claim 5, characterized in that, Also includes: Receiver compensation network and rectifier; The stacked DD receiving coil is connected to the rectifier through the receiving end compensation network; The rectifier is used to connect the load.

7. The receiving device as described in claim 6, characterized in that, The receiver compensation network includes a receiver compensation capacitor; The stacked DD receiving coil is connected to the rectifier through the receiving end compensation capacitor.

8. A dynamic wireless charging system, characterized in that, It includes a plurality of transmitting devices as described in any one of claims 1 to 4 and a receiving device as described in any one of claims 5 to 7; The plurality of transmitting devices are arranged along the target path, and the spacing between two adjacent figure-eight transmitting coils in the plurality of transmitting devices is the same as the spacing between the short side of the parallelogram formed by the first solenoid structure coil and the short side of the parallelogram formed by the second solenoid structure coil. The receiving device is mounted on the moving target moving along the target path, and the straight line containing the center point of the stacked DD receiving coil in the receiving device in the Y-axis direction is perpendicular to the first... i The figure-eight shaped transmitting coil and the first i When the center points of the +1 figure-eight shaped transmitting coils coincide on the straight line along the Y-axis, the first... i -1 The figure-eight shaped transmitting coil is de-energized, the... i The figure-eight shaped transmitting coil, the first i +1 figure-eight transmitting coil and the first i +2 figure-eight shaped transmitting coils are energized.

9. The dynamic wireless charging system as described in claim 8, characterized in that, The length of the short side of the parallelogram formed by the first solenoid coil, the length of the long side of the parallelogram formed by the first solenoid coil, and the distance between the short side of the parallelogram formed by the first solenoid coil and the short side of the parallelogram formed by the second solenoid coil are determined according to the installation position and installation space of the figure-eight transmitting coil on the target path. The second preset value, in which the inner diameter of the short side of the stacked DD receiving coil is wider than the width of the figure-eight transmitting coil, is determined based on the offset required by the moving target. The number of turns and the turn spacing of the first solenoid structure coil, the number of turns and the core width of the stacked DD receiving coil are optimized based on the required self-inductance of the figure-eight transmitting coil and the required self-inductance of the stacked DD receiving coil.

10. The dynamic wireless charging system as described in claim 9, characterized in that, The capacitance values ​​of the series compensation capacitor, the parallel compensation capacitor, and the compensation inductor in the transmitting device, as well as the capacitance value of the receiving compensation capacitor in the receiving device, are determined based on the required self-inductance value of the figure-eight transmitting coil, the required self-inductance value of the stacked DD receiving coil, and the system operating frequency.

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