Wireless charging system using self-decoupling coils to achieve interoperability

Abstract

The present invention relates to a wireless charging system that realizes interoperability by using a self-decoupling coil. The self-decoupling coil is composed of a transmitting coil A, a transmitting coil B, and a transmitting coil C. The transmitting coil A includes a winding L AA , a winding L AB , and a winding L AC . The transmitting coil B includes a winding L BB and a winding L BC . The transmitting coil C includes a winding L CC and a winding L CB . The windings L AA , L BB , and L CC are arranged in a triangular pyramid shape, and the winding L AA is arranged above the windings L BB and L CC . The winding L AB is nested inside the winding L BB . The winding L CB is nested inside the winding L AB . The winding L AC is nested inside the winding L CC . The winding L BC is nested inside the winding L AC . The topological structure of the wireless charging system switches the working mode by switching the outputs of three bridge arms, achieving compatibility with a unipolar coil, a bipolar coil along the X direction, and a bipolar coil along the Y direction, thereby realizing interoperability with different receiving coils.

Description

Technical Field

[0001] The present invention relates to the field of wireless charging technology, and in particular to a wireless charging system that uses a self-decoupling coil to achieve interoperability. Background Art

[0002] In recent years, with the formation of a low-carbon development trend worldwide, electric vehicles have developed rapidly. There are two main charging methods for electric vehicles: wired charging and wireless charging. Among them, wireless charging is favored because of its reliability, safety, convenience and automation in transmitting power. However, there are still many problems for wireless charging technology to be commercialized, and its interoperability is one of them. Since the receiving coils produced by different electric vehicle manufacturers may be different, there are interoperability issues between different transmitting coils and receiving coils. Currently common coil structures include unipolar coils, bipolar coils along the X direction, and bipolar coils along the Y direction, such as Figure 1 When these three coils are facing each other, they will be completely decoupled, resulting in no power transmission. Summary of the invention

[0003] The object of the present invention is to provide a wireless charging system that uses a self-decoupling coil to achieve interoperability, which is conducive to achieving interoperability for different receiving coils.

[0004] To achieve the above object, the technical solution adopted by the present invention is: a wireless charging system that uses a self-decoupling coil to achieve interoperability, wherein the self-decoupling coil is composed of a transmitting coil A, a transmitting coil B and a transmitting coil C, wherein the transmitting coil A includes a winding L AA , Winding L AB and winding L AC , the transmitting coil B includes a winding L BB and winding L BC , the transmitting coil C includes a winding L CC and winding L CB , the winding L AA , Winding L BB and winding L CC The winding L is arranged in a triangle shape. AA Set on winding L BB and winding L CC On the upper side, the winding L AB Nested in winding L BB Inside, the winding L CB Nested in winding L AB Inside, the winding L AC Nested in winding L CC Inside, the winding L BC Nested in winding L AC medial side;

[0005] The topological structure of the wireless charging system includes a transmitter inverter, inverter switches S1-S6, a transmitter series compensation inductor L F1 , L F2 , L F3 , parallel compensation capacitor at the transmitter C F1 , C F2 , C F3 , the transmitter end is connected in series with the compensation capacitor C T1 , C T2 , C T3 , transmitting coils A, B, C, receiving coil L R , the receiving end is connected in series with the compensation capacitor C R , rectifier diodes D1-D4, load resistor R L And the receiving end rectifier; the switch tubes S1 and S2, S3 and S4, S5 and S6 are connected in series and then in parallel at both ends of the transmitting end inverter; the capacitor C T1 Connected in series with the transmitting coil A and then connected to the capacitor C F1 In parallel, the resulting parallel circuit is the same as the inductance L F1 After being connected in series, they are connected in parallel at both ends of the switch tube S2; C T2 Connected in series with the transmitting coil B and then connected to the capacitor C F2 In parallel, the resulting parallel circuit is the same as the inductance L F2 After being connected in series, they are connected in parallel at both ends of the switch tube S4; C T3 After being connected in series with the transmitting coil C and the capacitor C F3 In parallel, the resulting parallel circuit is the same as the inductance L F3 After being connected in series, they are connected in parallel at both ends of the switch tube S6; thus, three bridge arms are formed at the transmitting end corresponding to the three transmitting coils; diodes D1 and D2, D3 and D4 are connected in series in the same direction and connected to the load resistor at the same time. R L , the receiving end rectifier is connected in parallel; the receiving coil L R With capacitor C RAfter the series connection, the two ends of the obtained series circuit are respectively connected between the diodes D1 and D2 and between the diodes D3 and D4.

[0006] Furthermore, the winding L BB and winding L CC It is a square structure with the same size, and the winding L BB With winding L CC Arranged in parallel; the winding L AA It is a rectangular structure, and its length is the same as the winding L BB and winding L CC The sum of the side lengths of the winding L AA The windings L are arranged in parallel BB and winding L CC upper side.

[0007] Furthermore, the topology of the wireless charging system switches the working mode by switching the outputs of the three bridge arms, thereby achieving compatibility with unipolar coils, bipolar coils along the X direction, and bipolar coils along the Y direction, thereby achieving interoperability with these three different receiving coils.

[0008] Furthermore, when the receiving end of the system is a unipolar coil, the system operates in mode 1. At this time, the switch tubes S1, S3, and S5 are turned on at the same time, and S2, S4, and S6 are turned on at the same time. The two switch tubes S1 and S2, S3 and S4, and S5 and S6 on the same bridge arm are complementary, and the three transmitting coils all transmit energy to the receiving end coil.

[0009] Furthermore, when the receiving end of the system is a bipolar coil along the X direction and is offset along the X axis, the system operates in mode 2. At this time, the switch tubes S1 and S2 are turned off, S3 and S6 are turned on at the same time, and S4 and S5 are turned on at the same time. The two switch tubes S3 and S4, S5 and S6 on the same bridge arm are complementary. The transmitting coil A does not transmit energy, and only transmits energy to the receiving coil through the transmitting coil B and the transmitting coil C.

[0010] Furthermore, when the receiving end of the system is a bipolar coil along the X direction and is offset along the positive direction of the Y axis, the system operates in mode three. At this time, the switch tubes S1, S4, and S5 are turned on at the same time, and S2, S3, and S6 are turned on at the same time. The two switch tubes S1 and S2, S3 and S4, and S5 and S6 on the same bridge arm are complementary.

[0011] Furthermore, when the receiving end of the system is a bipolar coil along the X direction and is offset along the negative direction of the Y axis, the system operates in mode four. At this time, the switch tubes S1, S3, and S6 are turned on at the same time, and S2, S3, and S5 are turned on at the same time. The two switch tubes S1 and S2, S3 and S4, and S5 and S6 on the same bridge arm are complementary.

[0012] Furthermore, when the receiving end of the system is a bipolar coil along the Y direction, the system operates in mode five. At this time, the switch tubes S1, S4, and S6 are turned on at the same time, and S2, S3, and S3 are turned on at the same time. The two switch tubes S1 and S2, S3 and S4, and S5 and S6 on the same bridge arm are complementary. The three transmitting coils all transmit energy to the receiving end coil, but the current flows in different directions at the transmitting end.

[0013] Compared with the prior art, the present invention has the following beneficial effects: It provides a wireless charging system that uses self-decoupling coils to achieve interoperability. Through the design of self-decoupling coils, the three transmitting ends of the system are decoupled from each other through nested windings, without the need for external decoupling coils, which simplifies the difficulty of analysis and avoids the impact of cross-coupling on efficiency. The system can transmit power to three types of coils: unipolar coils, bipolar coils along the X direction and along the Y direction, and achieves interoperability for these three coils. In addition, the system can easily change the current direction of the transmitting coil through the proposed topological structure, and realize the switching of working modes to match different receiving coils. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of a common coil structure in the prior art.

[0015] Figure 2 Schematic diagram of the structure of the self-decoupling coil in an embodiment of the present invention.

[0016] Figure 3 Schematic diagram of the coil structure at different receiving ends in the embodiment of the present invention.

[0017] Figure 4 is a topological diagram of a wireless charging system in an embodiment of the present invention.

[0018] Figure 5 It is a topological diagram of the system in various working modes in the embodiment of the present invention. DETAILED DESCRIPTION

[0019] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0020] It should be noted that the following detailed descriptions are exemplary and are intended to provide further explanation of the present application. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which the present application belongs.

[0021] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0022] This embodiment provides a wireless charging system that uses a self-decoupling coil to achieve interoperability. The self-decoupling coil is composed of a transmitting coil A, a transmitting coil B, and a transmitting coil C. The transmitting coil A includes a winding L AA , Winding L AB and winding L AC , the transmitting coil B includes a winding L BB and winding L BC , the transmitting coil C includes a winding L CC and winding L CB , the winding L AA , Winding L BB and winding L CC The winding L is arranged in a triangle shape. AA Set on winding L BB and winding L CC On the upper side, the winding L AB Nested in winding L BB Inside, the winding L CB Nested in winding L AB Inside, the winding L AC Nested in winding L CC Inside, the winding L BC Nested in winding L AC Inside.

[0023] The self-decoupling coil structure proposed by the present invention is as follows: Figure 2 As shown, when the receiving ends are unipolar, bipolar coils along the X direction and along the Y direction, the coil structure is as follows Figure 3 By nesting the windings of another coil between adjacent coils, decoupling between them can be achieved. For example, when the current is in the positive direction Figure 2 As shown, coil L AA In coil L BB The mutual inductance generated on the coil is negative, and the coil L AB In coil L BB The mutual inductance generated on the coil is positive, and the coil L AC In coil L BCThe mutual inductance generated on the coil is also positive. Therefore, by adjusting the number of turns and the enclosed area of ​​the middle decoupling coil, the decoupling between the two coils A and B can be achieved. Similarly, the mutual decoupling between the three coils A, B, and C can be achieved.

[0024] like Figure 2 As shown, in this embodiment, the winding L BB and winding L CC It is a square structure with the same size, and the winding L BB With winding L CC Arranged in parallel; the winding L AA It is a rectangular structure, and its length is the same as the winding L BB and winding L CC The sum of the side lengths of the winding L AA The windings L are arranged in parallel BB and winding L CC upper side.

[0025] Based on the above-mentioned herringbone self-decoupling coil, this embodiment proposes a multi-channel parallel LCC-S topology, such as Figure 4 The topological structure of the wireless charging system includes a transmitter inverter, inverter switches S1-S6, a transmitter series compensation inductor L F1 , L F2 , L F3 , parallel compensation capacitor at the transmitter C F1 , C F2 , C F3 , the transmitter end is connected in series with the compensation capacitor C T1 , C T2 , C T3 , transmitting coils A, B, C, receiving coil L R , the receiving end is connected in series with the compensation capacitor C R , rectifier diodes D1-D4, load resistor R L And the receiving end rectifier. The DC voltage of the transmitting end inverter is V INV , the DC voltage of the receiving end rectifier is V REC , the self-inductances of the transmitting coils A, B, and C are L T1 , LT2 , L T3 The corresponding currents are I T1 , I T2 , I T3 , transmitter series compensation inductor L F1 , L F2 , L F3 The corresponding currents are I F1 , I F2 , I F3 , the receiving coil current is I R . Transmitting coils A, B, C and receiving coils L R The mutual inductance between them is M T1R , M T2R , M T3R , the cross coupling between the transmitting coils can be neglected.

[0026] The switch tubes S1 and S2, S3 and S4, S5 and S6 are connected in series and then in parallel at both ends of the transmitter inverter; the capacitor C T1 Connected in series with the transmitting coil A and then connected to the capacitor C F1 In parallel, the resulting parallel circuit is the same as the inductance L F1 After being connected in series, they are connected in parallel at both ends of the switch tube S2; C T2 Connected in series with the transmitting coil B and then connected to the capacitor C F2 In parallel, the resulting parallel circuit is the same as the inductance L F2 After being connected in series, they are connected in parallel at both ends of the switch tube S4; C T3 After being connected in series with the transmitting coil C and the capacitor C F3 In parallel, the resulting parallel circuit is the same as the inductance L F3 After being connected in series, they are connected in parallel at both ends of the switch tube S6; thus, three bridge arms are formed at the transmitting end corresponding to the three transmitting coils; diodes D1 and D2, D3 and D4 are connected in series in the same direction and connected to the load resistor at the same time. R L , the receiving end rectifier is connected in parallel; the receiving coilL R With capacitor C R After the series connection, the two ends of the obtained series circuit are respectively connected between the diodes D1 and D2 and between the diodes D3 and D4.

[0027] This topology switches the working mode by switching the output of the three bridge arms, achieving compatibility with unipolar coils, bipolar coils along the X direction, and bipolar coils along the Y direction, thereby achieving interoperability with these three different receiving coils. The system has five working modes, such as Figure 5 By adjusting the conduction of the switch tube, the output of the three-phase inverter bridge is adjusted, and then the current flow direction of the three transmitting coils is changed, so as to achieve the purpose of switching the working mode and realize the interoperability of the three coils: unipolar coils, bipolar coils along the X direction and bipolar coils along the Y direction.

[0028] When the receiving end of the system is a unipolar coil, the system works in mode 1. At this time, the switch tubes S1, S3, and S5 are turned on at the same time, and S2, S4, and S6 are turned on at the same time. The two switch tubes S1 and S2, S3 and S4, and S5 and S6 on the same bridge arm are complementary, and the three transmitting coils all transmit energy to the receiving coil.

[0029] When the receiving end of the system is a bipolar coil along the X direction and is offset along the X axis, the system works in mode 2. At this time, the switch tubes S1 and S2 are turned off, S3 and S6 are turned on at the same time, and S4 and S5 are turned on at the same time. The two switch tubes S3 and S4, S5 and S6 on the same bridge arm are complementary. The transmitting coil A does not transmit energy, and only transmits energy to the receiving coil through the transmitting coil B and the transmitting coil C.

[0030] When the receiving end of the system is a bipolar coil along the X direction and is offset along the positive direction of the Y axis, the system operates in mode three. At this time, the switch tubes S1, S4, and S5 are turned on at the same time, and S2, S3, and S6 are turned on at the same time. The two switch tubes S1 and S2, S3 and S4, and S5 and S6 on the same bridge arm are complementary.

[0031] When the receiving end of the system is a bipolar coil along the X direction and offset along the negative direction of the Y axis, the system works in mode 4. At this time, the switch tubes S1, S3, and S6 are turned on at the same time, and S2, S3, and S5 are turned on at the same time. The two switch tubes S1 and S2, S3 and S4, and S5 and S6 on the same bridge arm are complementary.

[0032] When the receiving end of the system is a bipolar coil along the Y direction, the system works in mode five. At this time, the switch tubes S1, S4, and S6 are turned on at the same time, and S2, S3, and S3 are turned on at the same time. The two switch tubes S1 and S2, S3 and S4, and S5 and S6 on the same bridge arm are complementary. The three transmitting coils all transmit energy to the receiving coil, but the current flows in different directions at the transmitting end.

[0033] The following simulation verifies that the coil structure and topology structure proposed by the present invention can effectively realize the decoupling between the transmitting coils, and can also transmit power to the three types of coils, namely, the monopolar coil, the bipolar coil along the X direction and the bipolar coil along the Y direction, thus realizing the interoperability of the three types of coils. When the transmitting end is facing the receiving end, the coupling coefficients between the coils corresponding to different receiving end coils are shown in Table 1.

[0034] Table 1 Coupling coefficients between coils

[0035]

[0036] The wireless charging system using self-decoupling coils to achieve interoperability proposed by the present invention can switch the working mode by changing the output of the three-phase inverter, and the system can achieve interoperability for three types of coils: unipolar, bipolar coils along the X direction and bipolar coils along the Y direction. When the receiving end of the system is a unipolar coil, the system works in mode one, and the three transmitting coils all transmit energy to the receiving end coil; when the receiving end of the system is a bipolar coil along the X direction and offset along the X axis, it works in mode two, and the transmitting coil A does not transmit energy, and only transmits energy to the receiving coil through the transmitting coil B and the transmitting coil C; when the receiving end of the system is a bipolar coil along the X direction and offset along the positive direction of the Y axis, the system works in mode three; when the receiving end of the system is a bipolar coil along the X direction and offset along the negative direction of the Y axis, the system works in mode four; when the receiving end of the system is a bipolar coil along the Y direction, the system works in mode five, and the three transmitting coils all transmit energy to the receiving end coil, but the current flows in different directions at the transmitting end.

[0037] The above is only a preferred embodiment of the present invention, and does not limit the present invention in other forms. Any technician familiar with the profession may use the above disclosed technical content to change or modify it into an equivalent embodiment with equivalent changes. However, any simple modification, equivalent change and modification made to the above embodiment according to the technical essence of the present invention without departing from the technical solution of the present invention still belongs to the protection scope of the technical solution of the present invention.

Claims

1. A wireless charging system using a self-decoupling coil to achieve interoperability, characterized in that: The self-decoupling coil is composed of a transmitting coil A, a transmitting coil B and a transmitting coil C. The transmitting coil A includes a winding L AA , Winding L AB and winding L AC , the transmitting coil B includes a winding L BB and winding L BC , the transmitting coil C includes a winding L CC and winding L CB , the winding L AA , Winding L BB and winding L CC The winding L is arranged in a triangle shape. AA Set on winding L BB and winding L CC On the upper side, the winding L AB Nested in winding L BB Inside, the winding L CB Nested in winding L AB Inside, the winding L AC Nested in winding L CC Inside, the winding L BC Nested in winding L AC medial side; The topological structure of the wireless charging system includes a transmitter inverter, inverter switch tubes S1, S2, S3, S4, S5, S6, a transmitter series compensation inductor L F1 , L F2 , L F3 , parallel compensation capacitor at the transmitter C F1 , C F2 , C F3 , the transmitter end is connected in series with the compensation capacitor C T1 , C T2 , C T3 , transmitting coils A, B, C, receiving coil L R , the receiving end is connected in series with the compensation capacitor C R , rectifier diodes D1, D2, D3, D4, load resistance R L And the receiving end rectifier; the inverter switch tubes S1 and S2, S3 and S4, S5 and S6 are connected in series and then connected in parallel at both ends of the transmitting end inverter; the compensation capacitor C T1 Connected in series with the transmitting coil A and the compensation capacitor C F1 In parallel, the resulting parallel circuit is the same as the inductance L F1 After being connected in series, they are connected in parallel at both ends of the inverter switch tube S2; compensation capacitor C T2 After being connected in series with the transmitting coil B and the compensation capacitor C F2 In parallel, the resulting parallel circuit and compensation inductance L F2 After being connected in series, they are connected in parallel at both ends of the inverter switch tube S4; compensation capacitor C T3 After being connected in series with the transmitting coil C and the compensation capacitor C F3 In parallel, the resulting parallel circuit is the same as the inductance L F3 After being connected in series, they are connected in parallel at both ends of the inverter switch tube S6; thus, three bridge arms are formed at the transmitting end corresponding to the three transmitting coils; the rectifier diodes D1 and D2, D3 and D4 are connected in series in the same direction and then connected to the load resistor at the same time. R L , the receiving end rectifier is connected in parallel; the receiving coil L R With compensation capacitor C R After the series connection, the two ends of the obtained series circuit are respectively connected between the rectifier diodes D1 and D2 and between the rectifier diodes D3 and D4; The winding L BB and winding L CC It is a square structure with the same size, and the winding L BB With winding L CC Arranged in parallel; the winding L AA It is a rectangular structure, and its length is the same as the winding L BB and winding L CC The sum of the side lengths of the winding L AA The windings L are arranged in parallel BB and winding L CC upper side; The topology of the wireless charging system switches the working mode by switching the outputs of the three bridge arms, thereby achieving compatibility with a unipolar coil, a bipolar coil along the X direction, and a bipolar coil along the Y direction, thereby achieving interoperability with these three different receiving coils.

2. The wireless charging system for achieving interoperability using self-decoupling coils according to claim 1, characterized in that: When the receiving end of the system is a unipolar coil, the system works in mode 1. At this time, the inverter switches S1, S3, and S5 are turned on at the same time, and S2, S4, and S6 are turned on at the same time. The two inverter switches S1 and S2, S3 and S4, and S5 and S6 on the same bridge arm are complementary, and the three transmitting coils all transmit energy to the receiving coil.

3. The wireless charging system for achieving interoperability using self-decoupling coils according to claim 1, characterized in that: When the receiving end of the system is a bipolar coil along the X direction and is offset along the X axis, the system works in mode 2. At this time, the inverter switches S1 and S2 are turned off, the inverter switches S3 and S6 are turned on at the same time, and the inverter switches S4 and S5 are turned on at the same time. The two inverter switches S3 and S4 and the inverter switches S5 and S6 on the same bridge arm are complementary. The transmitting coil A does not transmit energy, and only transmits energy to the receiving coil through the transmitting coil B and the transmitting coil C.

4. The wireless charging system for achieving interoperability using self-decoupling coils according to claim 1, characterized in that: When the receiving end of the system is a bipolar coil along the X direction and is offset along the positive direction of the Y axis, the system works in mode three. At this time, the inverter switches S1, S4, and S5 are turned on at the same time, and the inverter switches S2, S3, and S6 are turned on at the same time. The two inverter switches S1 and S2, S3 and S4, and S5 and S6 on the same bridge arm are complementary.

5. The wireless charging system for achieving interoperability using self-decoupling coils according to claim 1, characterized in that: When the receiving end of the system is a bipolar coil along the X direction and is offset along the negative direction of the Y axis, the system operates in mode 4. At this time, the inverter switches S1, S3, and S6 are turned on at the same time, and the inverter switches S2, S3, and S5 are turned on at the same time. The two inverter switches S1 and S2, the inverter switches S3 and S4, and the inverter switches S5 and S6 on the same bridge arm are complementary.

6. The wireless charging system for achieving interoperability using self-decoupling coils according to claim 1, characterized in that: When the receiving end of the system is a bipolar coil along the Y direction, the system works in mode five. At this time, the inverter switches S1, S4, and S6 are turned on at the same time, and the inverter switches S2, S3, and S3 are turned on at the same time. The two inverter switches S1 and S2, the inverter switches S3 and S4, and the inverter switches S5 and S6 on the same bridge arm are complementary. The three transmitting coils all transmit energy to the receiving coil, but the current flows in different directions at the transmitting end.

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