Transmitting terminal compatible with two kinds of receiving coils and wireless charging system and device

Abstract

The utility model belongs to the technical field of wireless electric energy transmission, and particularly relates to a transmitting terminal compatible with two kinds of receiving coils, a wireless charging system and wireless charging equipment. The transmitting end comprises a direct-current power supply, a high-frequency inverter, a first primary side coil, a second primary side coil, a primary side compensation capacitor and a single-pole double-throw switch. The transmitting end is matched with the first primary side coil and the second primary side coil through the single-pole double-throw switch, so that compatibility of the two receiving coils can be realized. The wireless charging system comprises the transmitting end and the receiving end which are coupled, the first primary side coil and the second primary side coil are switched by arranging the single-pole double-throw switch, multiplexing of the first primary side coil and the second primary side coil between the transmitting coil and the compensating coil is achieved, the complexity of the system is reduced, and the cost of the system is saved.

Description

Technical Field

[0001] This utility model belongs to the field of wireless power transmission technology, and specifically relates to a transmitter compatible with two types of receiving coils and a wireless charging system and device. Background Technology

[0002] To achieve 24-hour automated transportation and loading / unloading, modern automated systems require high efficiency, reliability, and adaptability in factory logistics and transportation systems. Industrial mobile robots are key components of automated and intelligent logistics and transportation systems, among which Automated Guided Vehicles (AGVs) come in many varieties and are typical representatives of industrial mobile robot systems. In recent years, AGVs, as intelligent transportation units, have proven their unique advantages in the logistics and sorting industries, saving a significant amount of work, significantly improving storage and sorting efficiency, and showcasing one aspect of intelligent manufacturing. As electrically powered devices, the charging issue of AGVs cannot be ignored; otherwise, insufficient power will cause AGVs to stop, directly affecting work efficiency. In recent years, wireless charging has developed rapidly, offering advantages such as convenience, flexibility, resistance to environmental impacts, no need for power outlets, and safe charging.

[0003] The AGV wireless power transfer system comprises two parts: coil structure and compensation topology. Regarding the coil structure, AGV wireless charging typically uses MCR-WPT technology. In early applications, two parallel energized metal wires were used to form a track, with opposite currents flowing through the primary coil. The AGV received energy through the track, but this method suffers from low power transmission, low efficiency, and poor resistance to offset. Static charging using a single coil can improve transmission efficiency and offer better battery protection. Domestic and international research institutions have classified and summarized coils of various shapes and structures, including circular, square, double D-shaped, and overlapping coils. They have also analyzed the properties and application scenarios of different coils. Each coil has its advantages in different application scenarios. However, the receiver coils in AGV wireless charging systems are diverse, and the primary coils corresponding to different types of receiver coils are also different. Currently, the fixed type of a single transmitter coil makes it difficult to accommodate the charging needs of multiple receiver coils. Utility Model Content

[0004] To address the technical problem that existing AGV wireless charging systems use diverse coil types at the receiver end while the coil type at a single transmitter end is fixed, making it difficult to accommodate the charging needs of multiple receiver coils, this invention provides a transmitter end and wireless charging system / equipment compatible with two types of receiver coils. The specific technical solution is as follows:

[0005] A transmitter compatible with two receiving coils, including a DC power supply (U dc ) and a high-frequency inverter, including a first primary winding (L p ), second primary coil (Lt ), primary-side compensation capacitor (C) p The single-pole double-throw switch includes a moving terminal (S), a first stationary terminal (S1), and a second stationary terminal (S2).

[0006] The DC power supply (U) dc The high-frequency inverter is connected to a high-frequency inverter, and one output terminal of the high-frequency inverter is connected to the second primary winding (L). t One end of the single-pole double-throw switch is connected to the first stationary terminal (S1);

[0007] The second primary coil (L) t The other end of the capacitor is connected to the primary-side compensation capacitor (C). p One end of ) and the first primary coil (L p One end of the primary-side compensation capacitor (C) is connected; p The other end of the switch is connected to the moving end (S) of the single-pole double-throw switch;

[0008] The first primary coil (L) p The other end of the switch is connected to the second stationary terminal (S2) of the single-pole double-throw switch and the other output terminal of the high-frequency inverter.

[0009] Preferably, the first primary coil (L p The first primary coil is a Q-type coil, and the second primary coil (L) is a Q-type coil. t () is a DD type coil.

[0010] Preferably, the first primary coil (L p ) and the second primary coil (L t They are respectively set on the two end faces of the transmitting magnetic core.

[0011] Preferably, the first primary coil (L p ) and the second primary coil (L t It is stacked on one end face of the transmitting magnetic core.

[0012] A wireless charging system compatible with two types of receiving coils includes a transmitter and a receiver; the receiver is coupled to the transmitter; the receiver includes receiving coils (L) connected in sequence. s ), secondary side compensation capacitor (C) s ), rectifier and filter circuit.

[0013] Preferably, the receiving coil (L) s ) set in the first primary coil (L p ) and the second primary coil (L t The side furthest from the transmitting magnetic core.

[0014] Preferably, the receiving coil (L)s It is a Q-type coil or a DD-type coil.

[0015] Preferably, the receiving coil (L) s The quantity is two, and the two receiving coils (L) s ) respectively set in the first primary coil (L p ) and the second primary coil (L t ( ) on one side.

[0016] Preferably, the two receiving coils (L) s Q-type coil and DD-type coil respectively.

[0017] A wireless charging device compatible with two types of receiving coils includes a housing and the wireless charging system disposed within the housing.

[0018] Compared with existing technologies, this utility model has the following beneficial effects:

[0019] The transmitter of this invention, through the cooperation of a single-pole double-throw switch with a first primary coil and a second primary coil, can achieve compatibility with two types of receiving coils, thereby improving the efficiency and applicability of wireless charging.

[0020] The wireless charging system of this invention uses a single-pole double-throw switch to switch between the first primary coil and the second primary coil, thereby enabling the multiplexing of the first and second primary coils between the transmitting coil and the compensation coil, reducing the complexity of the system and saving system costs. Attached Figure Description

[0021] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn to scale.

[0022] Figure 1 This is a circuit diagram of the transmitter and wireless charging system of this utility model.

[0023] Figure 2 This is a circuit diagram of the wireless charging system when the single-pole double-throw switch of this utility model is switched to the first stationary terminal S1.

[0024] Figure 3 This is a structural diagram of the coupling mechanism in Embodiments 1 and 3 of this utility model when the primary coil is distributed on both sides of the transmitting magnetic core.

[0025] Figure 4 This is an exploded view of the coupling mechanism when the primary coils are distributed on both sides of the transmitting magnetic core in Embodiments 1 and 3 of this utility model.

[0026] Figure 5 This is a magnetic field distribution diagram of the coupling mechanism when the primary coils are distributed on both sides of the transmitting magnetic core in Embodiment 3 of this utility model.

[0027] Figure 6 This is a structural diagram of the coupling mechanism in Embodiments 2 and 4 of this utility model when the primary coil is distributed on one side of the transmitting magnetic core.

[0028] Figure 7 This is an exploded view of the coupling mechanism when the primary coil is distributed on one side of the transmitting magnetic core in Embodiments 2 and 4 of this utility model.

[0029] Figure 8 This is a magnetic field distribution diagram of the coupling mechanism when the primary coil is distributed on one side of the transmitting magnetic core in Embodiment 4 of this utility model.

[0030] Figure 9 This is a waveform diagram of the system output voltage and current when the primary coil is distributed on both sides of the transmitting magnetic core and the second stationary terminal S2 is connected in Embodiment 3 of this utility model.

[0031] Figure 10 This is a waveform diagram of the system output voltage and current when the primary coil is distributed on both sides of the transmitting magnetic core and the first stationary terminal S1 is connected in Embodiment 3 of this utility model.

[0032] Figure 11 This is a waveform diagram of the system output voltage and current when the primary coil is distributed on one side of the transmitting magnetic core and the second stationary terminal S2 is connected in Embodiment 4 of this utility model.

[0033] Figure 12 The diagram shows the output voltage and current waveforms of the system when the primary coil is distributed on one side of the transmitting core and the first stationary terminal S1 is connected. Detailed Implementation

[0034] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0035] In the description of this utility model, it should be noted that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "top surface", "bottom surface", "inner", "outer", "inner side", "outer side", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0036] In the description of this utility model, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. If the terms "first," "second," and "third" are used in the description, they are for descriptive purposes and to distinguish technical features, and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the sequential relationship of the indicated technical features.

[0037] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "setting" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances. The embodiments of this utility model will now be described based on its overall structure.

[0038] Example 1:

[0039] like Figure 1 As shown, this embodiment provides a transmitter compatible with two types of receiving coils, including a DC power supply U. dc And a high-frequency inverter, also including the first primary winding L p Second primary coil L t Primary-side compensation capacitor C p And a single-pole double-throw switch; a single-pole double-throw switch includes a moving terminal S, a first stationary terminal S1, and a second stationary terminal S2;

[0040] DC power supply U dc Connected to a high-frequency inverter, one output terminal of the high-frequency inverter is connected to the second primary coil L. t One end of the single-pole double-throw switch is connected to the first stationary terminal S1 of the single-pole double-throw switch;

[0041] Second primary coil Lt The other end is connected to the primary compensation capacitor C. p One end, the first primary coil L p One end is connected; primary-side compensation capacitor C p The other end is connected to the moving end S of the single-pole double-throw switch;

[0042] First primary coil L p The other end is connected to the second stationary terminal S2 of the single-pole double-throw switch and the other output terminal of the high-frequency inverter, respectively.

[0043] The high-frequency inverter includes four MOSFETs, Q1-Q4.

[0044] The working principle of the transmitter of this utility model is as follows:

[0045] A high-frequency inverter converts DC power into AC current, which is then transmitted from the transmitter to the receiver. Specifically, when the receiving coil L at the receiver... s With the first primary coil L p When aligned, the moving terminal S of the single-pole double-throw switch is connected to the second stationary terminal S2, and the receiving coil L... s With the first primary coil L p The mutual inductance is M1, and the second primary coil is L. t and primary-side compensation capacitor C p This constitutes the primary-side compensation circuit. When the receiving coil L... s With the second primary coil L t When aligned, the moving end of the single-pole double-throw switch is connected to the first stationary end S1, and the receiving coil L... s With the first primary coil L t The mutual inductance is M2, and the first primary coil is L. p and primary-side compensation capacitor C p This constitutes the primary-side compensation circuit. A single-pole double-throw switch is used to control the first primary-side coil L. p Second primary coil L t The switching was performed, realizing the first primary coil L p Second primary coil L t Multiplexing between the transmitting coil and the compensation coil reduces system complexity and saves system costs. Furthermore, it connects to the first primary coil L via a single-pole double-throw switch. p Second primary coil L t The combination of these technologies enables compatibility with both types of receiving coils, improving the efficiency and applicability of wireless charging.

[0046] In a preferred embodiment, the first primary coil L p Select a Q-type coil, with the second primary coil L... t Select a DD type coil. At this time, it is related to the first primary coil L.p The coupling is also a Q-type coil, with the second primary coil L. t The coupling is also a DD type coil.

[0047] As a preferred embodiment, such as Figure 3-4 As shown, the receiver also includes a transmitting magnetic core P1 and a first primary coil L. p Second primary coil L t These are respectively positioned on both end faces of the transmitting magnetic core. At this time, there are two sets of receivers, with the receiving coils of the two sets of receivers respectively located on the first primary coil L. p Second primary coil L t On one side. In this embodiment, the transmitting end and the two receiving ends are all placed vertically, and the two receiving coils L s These are Q-type coils and DD-type coils, respectively. The Q-type receiving coil is L. s Located in the first primary coil L p On one side, the DD-type coil is located at the second primary coil L. t On one side, the transmitter can selectively couple with one of the two sets of receivers for power transmission, enabling the transmitter to be used on both sides in one unit. In this embodiment, a ferrite core is provided to enhance the magnetic field.

[0048] Example 2:

[0049] like Figure 1 As shown, this embodiment provides a transmitter compatible with two types of receiving coils, including a DC power supply U. dc And a high-frequency inverter, also including the first primary winding L p Second primary coil L t Primary-side compensation capacitor C p And a single-pole double-throw switch; a single-pole double-throw switch includes a moving terminal S, a first stationary terminal S1, and a second stationary terminal S2.

[0050] As a preferred embodiment, such as Figure 6-7 As shown, the first primary coil L p Second primary coil L t They are stacked on one end face of the transmitting magnetic core P1. At this time, there is one set of receivers, with the receiving coil L at the receiver end. s Set in the first primary coil L p Second primary coil L t The side furthest from the emitting magnetic core P1. Everything else is the same as in Example 1.

[0051] Example 3:

[0052] like Figure 1As shown, this embodiment provides a wireless charging system compatible with two types of receiving coils, including the transmitter and receiver as in Embodiment 1; the receiver is coupled to the transmitter; the receiver includes receiving coils L connected in sequence. s Secondary side compensation capacitor C s 1. Rectifier and filter circuit.

[0053] The rectifier and filter circuit includes four rectifier diodes (D1-D4) and a filter capacitor (C). o .

[0054] Receiving coil L s The quantity is two, two receiving coils L s They are respectively set in the first primary coil L p Second primary coil L t One side. Specifically, such as Figure 3 and Figure 4 As shown, the transmitter and two receivers are all placed vertically, with two receiving coils L. s These are Q-type coils and DD-type coils, respectively. The Q-type receiving coil is L. s Located in the first primary coil L p On one side, the DD-type coil is located at the second primary coil L. t On one side, the transmitter can selectively couple with one of the two sets of receivers for power transmission, enabling the transmitter to be used on both sides in one unit. Meanwhile, in the receiving coil L... s A receiving magnetic core P2 is located on the side furthest from the transmitter. To shield against magnetic field interference from inside the AGV, the receiving magnetic core P2 is positioned furthest from the receiving coil L. s An aluminum plate P3 is installed on one side.

[0055] In this embodiment, the first primary coil L p Second primary coil L t All use 3mm Litz wire, receiving coil L s Using 2mm Litz wire, all coils are 20cm x 20cm in size. The first primary coil L... p Second primary coil L t and receiving coil L s The number of turns is 20, 12, and 8 turns respectively. The aluminum plate P3 is 1mm thick and 20cm × 20cm in size. The thicknesses of the transmitting magnetic core P1 and the receiving magnetic core P2 are 3mm and 2mm respectively. The magnetic field distribution of the coupling mechanism is modeled using COMSOL simulation software as follows: Figure 5 As shown. By Figure 5 It can be seen that the first primary coil L p Second primary coil L tWhen the magnetic field is distributed on both sides of the transmitting magnetic core P1, the receiving end can achieve energy transmission on either side of the transmitting magnetic core P1.

[0056] In this embodiment, the first primary coil L p It is a Q-type coil, with the second primary coil L. t It is a DD type coil. When the receiving coil L s With the first primary coil L p When facing each other, the receiving coil L s With the first primary coil L p Both are Q-type coils. In this case, the receiving coil L... s With the second primary coil L t The mutual inductance M2 between them is negligible. When the receiving coil L... s With the second primary coil L t When facing each other, the receiving coil L s With the second primary coil L t Both are DD type coils. In this case, the receiving coil L s With the first primary coil L p The mutual inductance M1 between them is negligible. When the moving terminal S of the single-pole double-throw switch is connected to either the first stationary terminal S1 or the second stationary terminal S2, the transmitter structure is identical. Therefore, taking the moving terminal S and the first stationary terminal S1 of the single-pole double-throw switch as an example, the wireless charging system is analyzed. Its equivalent circuit diagram is as follows: Figure 2 As shown, the receiving end rectifier and filter circuit and the load R L Equivalent resistive load R eq for:

[0057] Using Kirchhoff's Voltage Law (KVL) and the relationship between the input and output voltages of the rectifier-filter circuit, and neglecting the parasitic resistance of the coil for simplicity, the following equation can be derived:

[0058]

[0059] In the formula, U in and I in These represent the output voltage and current of the high-frequency inverter, respectively, where ω is the system resonant angular frequency, and I... p I is the current flowing through the primary coil. s Let be the current flowing through the receiving coil. To ensure optimal transmission performance of the system, the resonance condition can be used to obtain:

[0060]

[0061] From the above analysis, we can solve for:

[0062]

[0063] Further results were obtained:

[0064]

[0065] As can be seen from the above current equation, the current in the primary coil is only related to the input voltage, the system resonant angular frequency, and the primary coil current L. p Related to load R. eq The voltage on is:

[0066]

[0067] As can be seen from the above formula, the output voltage is independent of the load, that is, the system has a constant voltage output characteristic.

[0068] In this embodiment, the wireless charging system is simulated by connecting the moving terminal S of a single-pole double-throw switch with the second stationary terminal S2. At this time, the second primary coil L... t As a compensation coil, the first primary coil L p With receiving coil L s Coupling, first primary coil L p With receiving coil L s All are Q-type coils, constructed as follows Figure 1 The simulation circuit diagram shown includes: input DC voltage U dc It is a 48V constant voltage source, with an operating frequency f of 100kHz and a load R. L The second primary coil L is 1.5Ω. t The self-inductance is 67.5 μH, and the first primary coil L p The self-inductance is 64.5 μH, and the receiving coil L s The self-inductance is 36.6μH, the mutual inductance M1 is 17μH, and the primary-side compensation capacitor C... p The secondary-side compensation capacitor C is 41.87nF. s The voltage is 69.21 nF. Substituting the parameters of this coupling mechanism and running the simulation model, the output voltage and current at the receiving end are obtained as follows: Figure 9 As shown.

[0069] Depend on Figure 9 It can be seen that when a constant DC voltage of 48V is given at the transmitting end, the output voltage at the receiving end rises rapidly and eventually stabilizes. At this time, the stable output voltage is 12.8V, the output current is 8.5A, and the output power is 108.8W.

[0070] In this embodiment, the system is simulated by connecting the moving terminal S of a single-pole double-throw switch with the first stationary terminal S1. At this time, the first primary coil L... p As a compensation coil, the second primary coil L t With receiving coil L s Coupling, second primary coil Lt With receiving coil L s All are DD type coils. Construction as follows: Figure 1 The simulation circuit diagram shown includes: input DC voltage U dc It is a 48V constant voltage source, with an operating frequency f of 100kHz and a load R. L The first primary coil L is 1.2Ω. p The self-inductance is 60μH, and the second primary coil L... t The self-inductance is 60.1 μH, and the receiving coil L... s The self-inductance is 40.7 μH, the mutual inductance M2 is 14.1 μH, and the primary-side compensation capacitor C... p The secondary-side compensation capacitor C is 45.15nF. s The voltage is 62.24 nF. Substituting the parameters of this coupling mechanism and running the simulation model, the output voltage and current at the receiving end are obtained as follows: Figure 10 As shown.

[0071] Depend on Figure 10 It can be seen that when a constant DC voltage of 48V is given at the transmitting end, the output voltage at the receiving end rises rapidly and eventually stabilizes. At this time, the stable output voltage is 11.3V, the output current is 9.5A, and the output power is 107.35W.

[0072] Depend on Figure 9 and Figure 10 It can be seen that the output voltage and output current of both types of receiving coils rise rapidly and eventually stabilize, with the output power reaching 100W, which can ensure the normal and stable operation of the system and achieve the design goal well.

[0073] Example 4:

[0074] like Figure 1 As shown, this embodiment provides a wireless charging system compatible with two types of receiving coils, including the transmitter and receiver as in Embodiment 2; the receiver is coupled to the transmitter; the receiver includes receiving coils L connected in sequence. s Secondary side compensation capacitor C s 1. Rectifier and filter circuit.

[0075] like Figure 6-7 As shown, the receiving coil L s It is a Q-type coil or a DD-type coil. The number of receivers is one set, with receiver coil L. s Set in the first primary coil L p Second primary coil L t The side furthest from the emitting magnetic core.

[0076] In this embodiment, both the transmitting and receiving ends are horizontally positioned, and the receiving coil L... sFor Q-type or DD-type coils, as above, in the receiving coil L s A receiving magnetic core P2 is located on the side furthest from the transmitter. To shield against magnetic field interference from inside the AGV, the receiving magnetic core P2 is positioned furthest from the receiving coil L. s An aluminum plate P3 is installed on one side.

[0077] In this embodiment, the first primary coil L p Second primary coil L t All use 3mm Litz wire, receiving coil L s Using 2mm Litz wire, all coils are 20cm x 20cm in size. The first primary coil L... p Second primary coil L t and receiving coil L s The number of turns is 20, 12, and 8 turns respectively. The aluminum plate P3 is 1mm thick and 20cm × 20cm in size. The thicknesses of the transmitting magnetic core P1 and the receiving magnetic core P2 are 3mm and 2mm respectively. The magnetic field distribution of the coupling mechanism is modeled using COMSOL simulation software as follows: Figure 8 As shown.

[0078] Depend on Figure 8 It can be seen that the first primary coil L p Second primary coil L t When the magnetic field is distributed on one side of the transmitting core, the magnetic field is mainly distributed on the primary coil side, and the receiving end can only achieve energy transfer on the primary coil side; due to the first primary coil L p Second primary coil L t Because they are of different types, they are compatible with different types of receiving coils.

[0079] In this embodiment, the system is simulated by connecting the moving end S of the single-pole double-throw switch S with the second stationary end S2. At this time, the receiving coil L s It is a Q-type coil, with the second primary coil L. t As a compensation coil, the first primary coil L p With receiving coil L s Coupling, constructing as Figure 1 The simulation circuit diagram shown includes: input DC voltage U dc It is a 48V constant voltage source, with an operating frequency f of 100kHz and a load R. L The second primary coil L is 1.6Ω. t The self-inductance is 61.6 μH, and the first primary coil L... p The self-inductance is 59μH, and the receiving coil L... s The self-inductance is 36.4 μH, the mutual inductance M1 is 16 μH, and the primary-side compensation capacitor C... p The secondary-side compensation capacitor C is 46.06nF. sThe voltage is 69.59 nF. Substituting the parameters of this coupling mechanism and running the simulation model, the output voltage and current at the receiving end are obtained as follows: Figure 11 As shown.

[0080] Depend on Figure 11 It can be seen that when a constant DC voltage of 48V is given at the transmitting end, the output voltage at the receiving end rises rapidly and eventually stabilizes. At this time, the stable output voltage is 13V, the output current is 8.1A, and the output power is 105.3W.

[0081] In this embodiment, the system is simulated by connecting the moving terminal S of a single-pole double-throw switch with the first stationary terminal S1. At this time, the receiving coil L... s It is a DD type coil, with the first primary coil L p As a compensation coil, the second primary coil L t With receiving coil L s Coupling, constructing as Figure 1 The simulation circuit diagram shown includes: input DC voltage U dc It is a 48V constant voltage source, with an operating frequency f of 100kHz and a load R. L The first primary coil L is 1.9Ω. p The self-inductance is 59.4 μH, and the second primary coil L... t The self-inductance is 59.86 μH, and the receiving coil L... s The self-inductance is 42.68 μH, the mutual inductance M2 is 17.8 μH, and the primary-side compensation capacitor C... p The secondary-side compensation capacitor C is 45.35nF. s The voltage is 59.35 nF. Substituting the parameters of this coupling mechanism and running the simulation model, the output voltage and current at the receiving end are obtained as follows: Figure 12 As shown.

[0082] Depend on Figure 12 It can be seen that when a constant DC voltage of 48V is given to the primary side, the output voltage of the receiving end rises rapidly and eventually stabilizes. At this time, the stable output voltage is 14.6V, the output current is 7.7A, and the output power is 112.42W.

[0083] Depend on Figure 11 and Figure 12 It can be seen that the output voltage and output current of both types of receiving coils rise rapidly and eventually stabilize, with the output power reaching 100W, which can ensure the normal and stable operation of the system and achieve the design goal well.

[0084] Example 5:

[0085] This embodiment provides a wireless charging device compatible with two types of receiving coils, including a housing and a wireless charging system of either embodiment 3 or 4, wherein the wireless charging system is disposed inside the housing.

[0086] In summary, this invention achieves compatibility with two types of receiving coils through a single transmitter, improving the efficiency and applicability of wireless charging. Furthermore, by using a single-pole double-throw switch to switch between the first and second primary coils, this invention enables the reuse of the first and second primary coils between the transmitting and compensating coils, reducing system complexity and saving system costs.

[0087] The foregoing description of specific exemplary embodiments of the present invention is for illustrative and explanatory purposes. These descriptions are not intended to limit the present invention to the precise forms disclosed, and it is obvious that many changes and variations can be made based on the above teachings. Although embodiments of the present invention have been shown and described, these specific embodiments are merely explanations of the present invention and are not intended to limit the invention. The specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. The purpose of selecting and describing exemplary embodiments is to explain the specific principles of the present invention and its practical application, so that those skilled in the art, after reading this specification, can make modifications, substitutions, variations, and various choices and changes to the embodiments as needed without departing from the principles and spirit of the present invention, provided that such modifications, substitutions, variations, and choices and changes are within the scope of the claims of the present invention and are protected by patent law.

Claims

1. A transmitting end compatible with two receiving coils, comprising a direct current power source (U dc ) and a high frequency inverter, characterized in that, Also include first primary coil (L p ), second primary coil (L t ), primary compensation capacitor (C p ) and single pole double throw switch; the single pole double throw switch includes the moving end (S), the first fixed end (S1), the second fixed end (S2); The DC power supply (U) dc The high-frequency inverter is connected to a high-frequency inverter, and one output terminal of the high-frequency inverter is connected to the second primary winding (L). t One end of the single-pole double-throw switch is connected to the first stationary terminal (S1); The second primary coil (L) t The other end of the capacitor is connected to the primary-side compensation capacitor (C). p One end of ) and the first primary coil (L p One end of the primary-side compensation capacitor (C) is connected; p The other end of the switch is connected to the moving end (S) of the single-pole double-throw switch; The other end of the first primary coil (L p ) is connected with the second fixed end (S2) of the single-pole double-throw switch and the other output end of the high-frequency inverter, respectively.

2. A transmitting end compatible with two receiving coils according to claim 1, characterized in that, The first primary coil (L) p The first primary coil is a Q-type coil, and the second primary coil (L) is a Q-type coil. t () is a DD type coil.

3. A transmitting end compatible with two receiving coils according to claim 1 or 2, characterized in that, The first primary coil (L p ) and the second primary coil (L t ) are respectively arranged on both side end surfaces of the transmitting magnetic core.

4. A transmitting end compatible with two receiving coils according to claim 1 or 2, characterized in that, The first primary coil (L p ) and the second primary coil (L t ) are stacked on one side end surface of the transmitting magnetic core.

5. A wireless charging system compatible with two receiving coils, characterized in that, The application relates to a transmitting end and a receiving end as claimed in any one of claims 1-4; the receiving end is coupled with the transmitting end; the receiving end comprises a receiving coil (L s ), a secondary side compensation capacitor (C s ) and a rectification filter circuit connected in sequence.

6. The wireless charging system compatible with two receiving coils of claim 5, wherein, The receiving coil (L) s ) set in the first primary coil (L p ) and the second primary coil (L t The side furthest from the emitting magnetic core.

7. The wireless charging system compatible with two receiving coils of claim 5, wherein, The receiving coil (L s ) is a Q-type coil or a DD-type coil.

8. The wireless charging system compatible with two receiving coils of claim 5, wherein, The number of the receiving coils (L s ) is two, and the two receiving coils (L s ) are respectively arranged on one side of the first primary coil (L p ) and the second primary coil (L t ).

9. The wireless charging system compatible with two receiving coils of claim 5, wherein, two said receiving coils (L s ) are respectively Q-type coils and DD-type coils. 10.A wireless charging device compatible with two receiving coils, characterized in that, The wireless charging system according to any one of claims 5 to 9 is provided in the housing.

Images