Separation channel type energy and information simultaneous transmission system and method based on double-layer orthogonal DD coil

Abstract

The invention relates to the technical field of wireless energy and signal simultaneous transmission, and particularly discloses a separated channel type energy and signal simultaneous transmission system and method based on a double-layer orthogonal DD coil. The four DD coils are switched to be in corresponding wiring conditions (only the first DD coil is connected, only the second DD coil is connected, the two DD coils are connected in series, and the two DD coils are connected in series reversely) according to offset conditions (a first offset area, a second offset area, a third offset area or a fourth offset area); the cross coupling between the energy coil and the signal coil is small, and the crosstalk of energy transmission to signal transmission is reduced. Or, by detecting the interference voltage of the signal loop under four wiring conditions, the wiring condition with the minimum interference voltage is selected, so that the minimum crosstalk in the signal transmission loop is ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of wireless energy and signal simultaneous transmission, and in particular to a separated channel energy and signal simultaneous transmission system and method based on a double-layer orthogonal DD coil. Background Art

[0002] Wireless power transfer (WPT) technology refers to the technology that uses magnetic field, electric field, microwave, etc. to realize the transmission of electric energy from power grid or battery to power-consuming equipment in a non-electrical contact manner by comprehensive application of electrical theory, power electronics technology, and control theory. The two commonly used wireless power transmission methods are magnetic field coupled wireless power transfer (MC-WPT) and electric field coupled wireless power transfer (EC-WPT). MC-WPT technology is widely used in electric vehicles, rail transit, rotating mechanisms, medical implants, consumer electronics and other fields due to its relatively mature overall technology, stable transmission performance, and large transmission power range. In the application of MC-WPT system, the functions of closed-loop control, optimal efficiency tracking, and return of inspection data require real-time, fast, and reliable information interaction between the primary and secondary sides. However, the existing traditional wireless communication technologies such as Bluetooth, ZigBee, WiFi, and radio frequency (RF) communication technology have the disadvantages of complex primary and secondary side pairing, large transmission delay, and limited use in special environments. Therefore, while transmitting electric energy, parallel transmission of signals is also required.

[0003] The existing parallel transmission technologies of electric energy and signals are mainly divided into shared channel type and separated channel type. The shared channel type means that energy and signal are loaded on the same circuit, which is generally suitable for systems with lower power. The signal injection circuit can be energy modulation type and carrier injection type. The energy modulation type has a simple structure and principle for the simultaneous transmission of energy and signal, but the signal waveform transmission rate is low and the interference of signal transmission on energy transmission is large; the carrier injection type can reduce the system volume and cost, and can realize duplex communication, but it also has the disadvantages of complex circuit design and control, limited communication rate, and mutual influence between energy transmission and communication. The separated channel type is to add one or more pairs of coils to form a signal transmission channel on the basis of retaining the original electric energy transmission channel. It is suitable for MC-WPT systems with higher power, and the cross-coupling between the energy coil and the signal coil is small, the channel bandwidth is large, and the circuit control is relatively simple. Its disadvantage is that the cross-coupling between the coils increases under offset conditions, which will affect the transmission of the signal.

[0004] In practical applications, it is difficult to achieve complete decoupling of the energy coil and the signal coil in a separated channel energy and signal transmission system. Cross-coupling will introduce crosstalk in the signal coil, thus affecting signal transmission. Using a wave blocking network to reduce crosstalk will increase the complexity of system parameter design. Currently, most signal coils use DD coils to achieve decoupling from the energy coil, but a single-layer DD coil can only achieve decoupling in the case of direct facing and radial offset. Offsets in other directions will lead to increased cross-coupling. Summary of the invention

[0005] The present invention provides a split-channel energy-signal simultaneous transmission system and method based on a double-layer orthogonal DD coil, and solves the technical problem of how to make the signal coil have good anti-deviation characteristics.

[0006] In order to solve the above technical problems, the present invention provides a separated channel type energy and signal simultaneous transmission system based on a double-layer orthogonal DD coil, which is provided with an energy transmission channel and a signal transmission channel, and the energy transmission channel is provided with a primary energy coil and a secondary energy coil. The key lies in: the signal transmission channel is provided with an orthogonally placed primary first DD coil and a primary second DD coil, and is also provided with an orthogonally placed secondary first DD coil and a secondary second DD coil; the primary energy coil, the primary first DD coil, and the primary second DD coil are stacked on the primary side to form a primary coupling mechanism, the secondary second DD coil, the secondary first DD coil, and the secondary energy coil are stacked on the secondary side to form a secondary coupling mechanism, and the primary coupling mechanism and the secondary coupling mechanism are symmetrically designed.

[0007] Preferably, the signal transmission channel is further provided with a primary-side DD coil control circuit; the primary-side DD coil control circuit includes a primary-side modulation and demodulation module, including a primary-side switch circuit connected between the primary-side first tuning network, the primary-side second tuning network, and the primary-side modulation and demodulation module, and a primary-side controller connected to the primary-side modulation and demodulation module and the primary-side switch circuit;

[0008] The primary side controller is used to control the primary side switch circuit to realize the following four primary side wiring conditions:

[0009] Primary side wiring situation 1: only the primary side second DD coil is connected to the primary side modulation and demodulation module;

[0010] Primary side wiring situation 2: only the primary side first DD coil is connected to the primary side modulation and demodulation module;

[0011] Primary side wiring situation three: the primary side first DD coil and the primary side second DD coil are connected in series and then connected to the primary side modulation and demodulation module;

[0012] Primary side wiring situation four: the primary side first DD coil and the primary side second DD coil are connected in reverse series and then connected to the primary side modulation and demodulation module.

[0013] Preferably, the signal transmission channel is further provided with a secondary side DD coil control circuit; the primary side DD coil control circuit includes a secondary side modulation and demodulation module, including a secondary side switch circuit connected between the secondary side first tuning network, the secondary side second tuning network, and the secondary side modulation and demodulation module, and a secondary side controller connected to the secondary side modulation and demodulation module and the secondary side switch circuit;

[0014] The secondary side controller is used to control the secondary side switch circuit to realize the following four secondary side wiring conditions:

[0015] Secondary side wiring situation 1: only the secondary side second DD coil is connected to the secondary side modulation and demodulation module;

[0016] Secondary side wiring situation 2: only the secondary side first DD coil is connected to the secondary side modulation and demodulation module;

[0017] Secondary side wiring situation three: the secondary side first DD coil and the secondary side second DD coil are connected in series and then connected to the secondary side modulation and demodulation module;

[0018] Secondary side wiring situation 4: the secondary side first DD coil and the secondary side second DD coil are connected in reverse series and then connected to the secondary side modulation and demodulation module.

[0019] Preferably, with the center of the primary first DD coil as the coordinate origin, the arrangement direction of the two D-shaped coils of the primary first DD coil as the X-axis, and the direction perpendicular to the X-axis on the primary first DD coil as the Y-axis, under different offset conditions, the primary controller controls the primary switch circuit, and the secondary controller controls the secondary switch circuit to achieve different wiring conditions, specifically:

[0020] When the primary coupling mechanism or the secondary coupling mechanism is in the first offset region within the range of the central angle (2π-a, a] and (3a+2b, 5a+2b], the primary controller controls the primary switch circuit to implement the primary wiring condition 1, and the secondary controller controls the secondary switch circuit to implement the secondary wiring condition 1, a∈[25°, 30°], b=90°-2a;

[0021] When the primary coupling mechanism or the secondary coupling mechanism is in the second offset region within the range of the central angle (a+b, 3a+b] and (5a+3b, 7a+3b], the primary controller controls the primary switch circuit to implement the primary wiring condition 2, and the secondary controller controls the secondary switch circuit to implement the secondary wiring condition 2;

[0022] When the primary side coupling mechanism or the secondary side coupling mechanism is in a third offset region within the range of the central angle (a, a+b] and (5a+2b, 5a+3b], the primary side controller controls the primary side switch circuit to implement the primary side wiring situation three, and the secondary side controller controls the secondary side switch circuit to implement the secondary side wiring situation three;

[0023] When the primary side coupling mechanism or the secondary side coupling mechanism is in the fourth offset area within the range of the central angle (3a+b, 3a+2b] and (7a+3b, 7a+4b], the primary side controller controls the primary side switch circuit to realize the primary side wiring condition four, and the secondary side controller controls the secondary side switch circuit to realize the secondary side wiring condition four.

[0024] Preferably, the primary side DD coil control circuit is further provided with a primary first tuning network and a primary second tuning network respectively connected to the primary first DD coil and the primary second DD coil, and the secondary side DD coil control circuit is further provided with a secondary first tuning network and a secondary second tuning network respectively connected to the secondary first DD coil and the secondary second DD coil.

[0025] Preferably, the primary switch circuit is provided with single-pole three-throw switches S1 and S3 and a single-pole double-throw switch S2; the fixed end of the switch S1 is connected to the second end of the primary first harmonic network, the first movable end and the second movable end of the switch S1 are respectively connected to the first end and the second end of the primary second harmonic network, and the third movable end of the switch S1 is suspended; the fixed end of the switch S2 is connected to the first input-output end of the primary modem module, the first movable end of the switch S2 is connected to the first end of the primary first harmonic network, and the second movable end of the switch S2 is connected to the first end of the primary second harmonic network; the fixed end of the switch S3 is connected to the second input-output end of the primary modem module, the first movable end of the switch S3 is connected to the second end of the primary first harmonic network, the second movable end of the switch S3 is connected to the second movable end of the switch S2, and the third movable end of the switch S3 is connected to the second end of the primary second harmonic network;

[0026] When the switch S1 is cut toward its third moving end, the switch S2 is cut toward its first moving end, and the switch S3 is cut toward its first moving end, the primary side wiring situation 1 is realized;

[0027] When the switch S1 is cut toward its third moving end, the switch S2 is cut toward its second moving end, and the switch S3 is cut toward its third moving end, the primary side wiring situation 2 is realized;

[0028] When the switch S1 is cut toward its second moving end, the switch S2 is cut toward its first moving end, and the switch S3 is cut toward its second moving end, the primary side wiring situation 3 is realized;

[0029] When the blade of the switch S1 is cut toward its first moving end, the switch S2 is cut toward its first moving end, and the switch S3 is cut toward its third moving end, the primary side wiring situation four is realized.

[0030] Preferably, when a signal is transmitted from the primary side to the secondary side, the primary side modulation and demodulation module is used to modulate the signal, and the secondary side modulation and demodulation module is used to demodulate the signal. The secondary side controller is also used to detect the interference voltage of the four DD coils of the secondary side modulation and demodulation module under four primary side wiring conditions and four secondary side wiring conditions, and control the primary side switching circuit, the primary side wiring condition with the smallest interference voltage of the secondary side switching circuit, and the secondary side wiring condition according to the size of the primary-secondary side interference voltage.

[0031] Preferably, the secondary switch circuit adopts the same circuit as the primary switch circuit;

[0032] When the signal is transmitted from the secondary side to the primary side, the secondary side modulation and demodulation module is used to modulate the signal, and the primary side modulation and demodulation module is used to demodulate the signal. The primary side controller is also used to detect the interference voltage of the four DD coils of the primary side modulation and demodulation module under four primary side wiring conditions and four secondary side wiring conditions, and control the primary side switching circuit and the secondary side switching circuit to achieve the primary side wiring condition and the secondary side wiring condition with the minimum interference voltage according to the size of the primary-secondary side interference voltage.

[0033] The present invention also provides a split-channel simultaneous transmission method based on a double-layer orthogonal DD coil, the key of which is that it is applied to the split-channel simultaneous transmission system based on a double-layer orthogonal DD coil, and the method comprises:

[0034] When the position of the secondary coupling mechanism is fixed, determine whether the secondary coupling mechanism is in the first offset area, the second offset area, the third offset area or the fourth offset area. If so, control the primary switching circuit and the secondary switching circuit to realize a set of primary wiring conditions and secondary wiring conditions corresponding to the offset conditions. Otherwise, realize any one of the four wiring conditions.

[0035] The present invention also provides a split-channel simultaneous transmission method based on a double-layer orthogonal DD coil, the key of which is that it is applied to the split-channel simultaneous transmission system based on a double-layer orthogonal DD coil, and the method comprises:

[0036] When the position of the secondary coupling mechanism is fixed, the primary switch circuit and the secondary switch circuit are controlled to sequentially realize the corresponding four primary wiring conditions and secondary wiring conditions, and the interference voltage of the four DD coils in each set of primary wiring conditions and secondary wiring conditions is detected;

[0037] The primary side switch circuit and the secondary side switch circuit are controlled to switch to a set of primary side wiring conditions and secondary side wiring conditions with the minimum interference voltage.

[0038] The separated-channel energy-signal simultaneous transmission system and method based on a double-layer orthogonal DD coil provided by the present invention sets a double-layer orthogonal DD coil as a signal coil, so that when a coupling mechanism is offset, the four DD coils are switched to corresponding wiring conditions (only the first DD coil is connected, only the second DD coil is connected, two DD coils are connected in series, and two DD coils are connected in reverse series) according to the offset situation (first offset area, second offset area, third offset area or fourth offset area), so that the cross-coupling between the energy coil and the signal coil is small, and the crosstalk of energy transmission on signal transmission is reduced; or, by detecting the signal loop interference voltage under the four wiring conditions, the wiring condition with the smallest interference voltage is selected to ensure that the crosstalk in the signal transmission loop is minimized. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 It is an exploded diagram of a magnetic coupling mechanism of a split-channel energy-signal simultaneous transmission system based on a double-layer orthogonal DD coil provided in an embodiment of the present invention;

[0040] Figure 2 Schematic diagram of the winding method of the DD coil provided in an embodiment of the present invention;

[0041] Figure 3 is a schematic diagram of offset area division provided by an embodiment of the present invention;

[0042] Figure 4 is a DD coil control circuit diagram of the primary side or the secondary side provided by an embodiment of the present invention;

[0043] Figure 5 It is a flow chart of a split-channel energy-signal simultaneous transmission method based on a double-layer orthogonal DD coil provided in an embodiment of the present invention;

[0044] Figure 6 is an interference voltage diagram of four DD coils when the X-axis is offset by 10 cm provided by an embodiment of the present invention;

[0045] Figure 7 It is an interference voltage diagram of four DD coils when the X-axis and Y-axis are offset by 10 cm provided by an embodiment of the present invention;

[0046] Figure 8 It is an interference voltage diagram of the two ends of the series DD coil when the X-axis and Y-axis are offset by 10 cm provided by an embodiment of the present invention;

[0047] Fig. 9 It is an interference voltage diagram at both ends of four DD coils when the X-axis is offset by 10 cm and the Y-axis is offset by 5 cm provided by an embodiment of the present invention;

[0048] Fig.10 This is a diagram of interference voltage at both ends of the series DD coil when the X-axis is offset by 10 cm and the Y-axis is offset by 5 cm provided by an embodiment of the present invention;

[0049] Fig.11 It is an interference voltage diagram at both ends of four DD coils when the X-axis offset is 10 cm and the Y-axis offset is -10 cm provided by an embodiment of the present invention;

[0050] Fig.12 This is an interference voltage diagram of the two ends of the reverse series DD coil when the X-axis offset is 10 cm and the Y-axis offset is -10 cm provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0051] The following specifically illustrates the implementation mode of the present invention in conjunction with the accompanying drawings. The embodiments are provided for illustrative purposes only and cannot be understood as limiting the present invention. The accompanying drawings are provided for reference and illustration only and do not constitute a limitation on the scope of patent protection of the present invention, because many changes can be made to the present invention without departing from the spirit and scope of the present invention.

[0052] The separated-channel energy and signal simultaneous transmission system based on a double-layer orthogonal DD coil provided in an embodiment of the present invention is provided with an energy transmission channel and a signal transmission channel. The energy transmission channel is provided with a primary energy coil and a secondary energy coil. The signal transmission channel is provided with an orthogonally placed primary first DD coil and a primary second DD coil, and is also provided with an orthogonally placed secondary first DD coil and a secondary second DD coil.

[0053] like Figure 1 As shown in the exploded diagram, the primary energy coil, the primary first DD coil, and the primary second DD coil are stacked on the primary side to form a primary coupling mechanism, and the secondary second DD coil, the secondary first DD coil, and the secondary energy coil are stacked on the secondary side to form a secondary coupling mechanism. The primary coupling mechanism and the secondary coupling mechanism are symmetrically designed. The primary coupling mechanism and the secondary coupling mechanism together constitute the magnetic coupling mechanism of the separated channel energy and signal transmission system. The primary energy coil and the secondary energy coil are combined into an electric energy coupling mechanism, and the four DD coils are combined into a signal coupling mechanism. In addition, in actual applications, the primary coupling mechanism is also provided with a primary aluminum plate and a primary magnetic core, and the secondary coupling mechanism is also provided with a secondary aluminum plate and a secondary magnetic core.

[0054] As for other parts of the energy transmission channel and the signal transmission channel, a common design may be adopted.

[0055] The four DD coils are wound in the same way. Figure 2As shown, a rectangle is wound counterclockwise from the starting point and then returned to the starting point, and then a rectangle of the same specification is wound clockwise on the other side and returned to the end point. If the energy coil adopts a Q-type coil, the DD coil on the primary side can be decoupled from the Q-type coil, and the two orthogonal DD coils are also decoupled. The secondary side is the same. When the secondary side coupling mechanism is offset, it will lead to an increase in the cross coupling between the primary side and the secondary side.

[0056] In order to make the signal coil have good anti-offset characteristics within the limited four-quadrant area, the present application adds a layer of DD coil on the basis of the existing single-layer DD coil, so that when the coil is offset, the wiring method of the four DD coils is controlled to minimize the crosstalk to the signal coil.

[0057] Specifically, the signal transmission channel is also provided with a primary side DD coil control circuit. The primary side DD coil control circuit includes a primary side modulation and demodulation module, a primary side switch circuit connected between the primary side first matching network, the primary side second matching network, and the primary side modulation and demodulation module, and a primary side controller connected between the primary side modulation and demodulation module and the primary side switch circuit;

[0058] The primary side controller is used to control the primary side switch circuit to achieve the following four primary side wiring conditions:

[0059] Primary side wiring situation 1: Only the second DD coil of the primary side is connected to the primary side modulation and demodulation module;

[0060] Primary side wiring situation 2: Only the first DD coil of the primary side is connected to the primary side modulation and demodulation module;

[0061] Primary side wiring situation three: the first DD coil of the primary side and the second DD coil of the primary side are connected in series and then connected to the primary side modulation and demodulation module;

[0062] Primary side wiring situation 4: The first DD coil of the primary side and the second DD coil of the primary side are connected in reverse series and then connected to the primary side modulation and demodulation module.

[0063] Based on the same design as the primary side, the signal transmission channel is also provided with a secondary side DD coil control circuit; the primary side DD coil control circuit includes a secondary side modulation and demodulation module, including a secondary side switch circuit connected between the secondary side first matching network, the secondary side second matching network, and the secondary side modulation and demodulation module, and a secondary side controller connected between the secondary side modulation and demodulation module and the secondary side switch circuit;

[0064] The secondary side controller is used to control the secondary side switch circuit to achieve the following four secondary side wiring conditions:

[0065] Secondary side wiring situation 1: Only the second DD coil of the secondary side is connected to the secondary side modulation and demodulation module;

[0066] Secondary side wiring situation 2: Only the first DD coil of the secondary side is connected to the secondary side modulation and demodulation module;

[0067] Secondary side wiring situation three: the first DD coil of the secondary side and the second DD coil of the secondary side are connected in series and then connected to the secondary side modulation and demodulation module;

[0068] Secondary side wiring situation 4: The first DD coil on the secondary side and the second DD coil on the secondary side are connected in reverse series and then connected to the secondary side modulation and demodulation module.

[0069] The primary side DD coil control circuit is also provided with a primary first tuning network and a primary second tuning network respectively connected to the primary first DD coil and the primary second DD coil, and the secondary side DD coil control circuit is also provided with a secondary first tuning network and a secondary second tuning network respectively connected to the secondary first DD coil and the secondary second DD coil.

[0070] Taking the center of the first DD coil of the primary side as the coordinate origin, the arrangement direction of the two D-shaped coils of the first DD coil of the primary side as the X-axis, and the direction perpendicular to the X-axis on the first DD coil of the primary side as the Y-axis, under different offset conditions, the primary controller controls the primary switch circuit, and the secondary controller controls the secondary switch circuit to achieve different wiring conditions, such as Figure 3 The offset area division diagram is shown in the figure, specifically:

[0071] When the primary coupling mechanism or the secondary coupling mechanism is in the first offset region (i.e., region I) within the range of the central angle (2π-a, a] and (3a+2b, 5a+2b], the primary controller controls the primary switch circuit to realize the primary connection situation 1, and the secondary controller controls the secondary switch circuit to realize the secondary connection situation 1, a∈[25°, 30°], b=90°-2a, and in this example, angle a is taken as 26.565°;

[0072] When the primary coupling mechanism or the secondary coupling mechanism is in the second offset region (i.e., region II) within the range of the central angle (a+b, 3a+b] and (5a+3b, 7a+3b], the primary controller controls the primary switch circuit to realize the primary wiring situation II, and the secondary controller controls the secondary switch circuit to realize the secondary wiring situation II;

[0073] When the primary coupling mechanism or the secondary coupling mechanism is in the third offset region (i.e., region III) within the central angle range of (a, a+b] and (5a+2b, 5a+3b], the primary controller controls the primary switch circuit to realize the primary wiring situation III, and the secondary controller controls the secondary switch circuit to realize the secondary wiring situation III;

[0074] When the primary coupling mechanism or the secondary coupling mechanism is in the fourth offset region (i.e., region IV) within the range of the central angles (3a+b, 3a+2b] and (7a+3b, 7a+4b], the primary controller controls the primary switch circuit to realize the primary connection situation four, and the secondary controller controls the secondary switch circuit to realize the secondary connection situation four.

[0075] The primary side DD coil control circuit and the secondary side use the same circuit, such as Figure 4 As shown, DD coil 1 represents the first DD coil on the primary side or the first DD coil on the secondary side, and DD coil 2 represents the second DD coil on the primary side or the second DD coil on the secondary side. SP3T switches S1 and S3 and SPDT switch S2 form a primary switch circuit or a secondary switch circuit.

[0076] Taking the primary switch circuit as an example, the fixed end of the switch S1 is connected to the second end D12 of the primary first matching network, the first mobile end a1 and the second mobile end a2 of the switch S1 are respectively connected to the first end D21 and the second end D22 of the primary second matching network, and the third mobile end a3 of the switch S1 is suspended; the fixed end of the switch S2 is connected to the first input-output end A of the primary modem module, the first mobile end b1 of the switch S2 is connected to the first end D11 of the primary first matching network, and the second mobile end b2 of the switch S2 is connected to the first end D21 of the primary second matching network; the fixed end of the switch S3 is connected to the second input-output end B of the primary modem module, the first mobile end c1 of the switch S3 is connected to the second end D12 of the primary first matching network, the second mobile end c2 of the switch S3 is connected to the second mobile end b2 of the switch S2, and the third mobile end c3 of the switch S3 is connected to the second end D22 of the primary second matching network;

[0077] When the switch S1 is cut toward its third moving end a3, the switch S2 is cut toward its first moving end b1, and the switch S3 is cut toward its first moving end c1, the primary side connection situation 1 is realized, that is, the primary side second DD coil is connected;

[0078] When the switch S1 is cut toward its third moving end a3, the switch S2 is cut toward its second moving end b2, and the switch S3 is cut toward its third moving end c3, the primary side connection situation 2 is realized, that is, the primary side first DD coil is connected;

[0079] When the switch S1 is cut to its second moving end a2, the switch S2 is cut to its first moving end b1, and the switch S3 is cut to its second moving end c2, the primary side connection situation 3 is realized, that is, the first and second DD coils of the primary side are connected in series;

[0080] When the switch S1 is cut toward its first moving end a1, the switch S2 is cut toward its first moving end b1, and the switch S3 is cut toward its third moving end c3, the primary side connection situation four is realized, that is, the first and second DD coils of the primary side are connected in reverse series.

[0081] The switch switching corresponding to the four wiring conditions of the primary side switch circuit and the secondary side switch circuit is shown in Table 1 below.

[0082] Table 1 Four wiring conditions

[0083]

[0084] When the secondary coupling mechanism deviates in the first offset region, the cross coupling between the energy coil and the DD coil 1 increases, and the crosstalk voltage on the DD coil 1 increases. At this time, only the DD coil 2 is connected to the signal transmission loop; similarly, when the secondary coupling mechanism deviates in the second offset region, only the DD coil 1 is connected to the signal transmission loop. When the secondary coupling mechanism deviates in the third offset region, there is in-phase crosstalk on the DD coils 1 and 2, and the crosstalk can be partially compensated by connecting the DD coils 1 and 2 in series; when the secondary coupling mechanism deviates in the fourth offset region, there is anti-phase crosstalk on the DD coils 1 and 2, and the crosstalk can be partially compensated by connecting the DD coils 1 and 2 in reverse series.

[0085] In addition, the interference voltage in the signal transmission channel under the four wiring conditions can be directly detected, and then the switch can be adjusted to connect the coil with the smallest interference voltage to the signal transmission loop. When the signal is transmitted from the primary side to the secondary side, the primary side modulation and demodulation module is used to modulate the signal, the secondary side modulation and demodulation module is used to demodulate the signal, and the secondary side controller is also used to detect the interference voltage of the four DD coils in the four primary side wiring conditions and the four secondary side wiring conditions of the secondary side modulation and demodulation module, and control the primary side switch circuit, the primary side wiring condition with the smallest interference voltage of the secondary side switch circuit, and the secondary side wiring condition according to the size of the primary and secondary side interference voltage. When the signal is transmitted from the secondary side to the primary side, the secondary side modulation and demodulation module is used to modulate the signal, the primary side modulation and demodulation module is used to demodulate the signal, and the primary side controller is also used to detect the interference voltage of the four DD coils in the four primary side wiring conditions and the four secondary side wiring conditions of the primary side modulation and demodulation module, and control the primary side switch circuit, the primary side wiring condition with the smallest interference voltage of the secondary side switch circuit, and the secondary side wiring condition according to the size of the primary and secondary side interference voltage.

[0086] When the offset position can be directly obtained, the first control method can be used (determine the DD coil wiring condition according to the offset position). When the offset position cannot be directly obtained, the second control method can be used (determine the DD coil wiring condition according to the interference voltage). When the offset position can be directly obtained but is offset within the quadrant, the second control method can be directly used. These two control methods can be set according to specific needs.

[0087] Based on the above system, an embodiment of the present invention further provides a split-channel energy-signal simultaneous transmission method based on a double-layer orthogonal DD coil, comprising:

[0088] When the position of the secondary coupling mechanism is fixed, determine whether the secondary coupling mechanism is in the first offset area, the second offset area, the third offset area or the fourth offset area. If so, control the primary switching circuit and the secondary switching circuit to realize a set of primary wiring conditions and secondary wiring conditions corresponding to the offset conditions. Otherwise, realize any one of the four wiring conditions.

[0089] Or, if Figure 5 As shown, including:

[0090] When the position of the secondary coupling mechanism is fixed, the primary switch circuit and the secondary switch circuit are controlled to realize the corresponding four primary wiring conditions and secondary wiring conditions in turn, and the interference voltage of the four DD coils in each set of primary wiring conditions and secondary wiring conditions is detected;

[0091] The primary side switch circuit and the secondary side switch circuit are controlled to be switched to a set of primary side wiring conditions and secondary side wiring conditions with the minimum interference voltage.

[0092] In summary, the separated-channel energy and signal simultaneous transmission system and method based on a double-layer orthogonal DD coil provided by the embodiment of the present invention sets a double-layer orthogonal DD coil as a signal coil, so that when the coupling mechanism is offset, the four DD coils are switched to corresponding wiring conditions (only the first DD coil is connected, only the second DD coil is connected, two DD coils are connected in series, and two DD coils are connected in reverse series) according to the offset situation (first offset area, second offset area, third offset area or fourth offset area), so that the cross-coupling between the energy coil and the signal coil is small, and the crosstalk of energy transmission on signal transmission is reduced; or, by detecting the signal loop interference voltage under the four wiring conditions, the wiring condition with the smallest interference voltage is selected to ensure that the crosstalk in the signal transmission loop is minimized.

[0093] The simulation verification is carried out below.

[0094] When the primary coupling mechanism is offset by 10 cm in the X-axis, the mutual inductance between the coils in the coupling mechanism is obtained through comsol simulation, and the interference voltage induced by cross coupling on the four DD coils can be obtained through simulink simulation. Figure 6 As shown, U PDD1 , U PDD2 , U SDD12 , U SDD2They represent the interference voltages of the first DD coil on the primary side, the second DD coil on the primary side, the first DD coil on the secondary side, and the second DD coil on the secondary side. It can be seen that the cross-coupling of the energy coil on the primary DD coil 1 and the secondary DD coil 1 increases, and the inductive crosstalk on the coil also increases. Therefore, it is necessary to cut these two coils out of the signal transmission loop through a switch. The inductive crosstalk of the energy coil on the primary DD coil 2 and the secondary DD coil 2 is very small. At this time, the signal is only transmitted through the primary DD coil 2 and the secondary DD coil 2.

[0095] When the secondary coupling mechanism is offset by 10cm in the X-axis and 10cm in the Y-axis, the mutual inductance between the coils in the coupling mechanism is obtained through comsol simulation, and the interference voltage induced by cross coupling on the four DD coils can be obtained through simulink simulation. Figure 7 As shown. It can be seen that the voltage magnitude and phase induced on the four DD coils are approximately equal at this time, so the interference can be compensated by connecting the coils in series. Figure 8 The figure shows the interference magnitude (U PCDD is the interference voltage after the two DD coils on the primary side are connected in series, U SCDD is the interference voltage after the two DD coils on the secondary side are connected in series), it can be seen that the crosstalk between the two ends of the series DD coil is approximately 0. For comparison, Figure 8 The interference voltage induced on the single DD coil is retained.

[0096] When the secondary coupling mechanism is offset by 10 cm in the X-axis and 5 cm in the Y-axis, the mutual inductance between the coils in the coupling mechanism is obtained through comsol simulation, and the interference voltage induced by cross coupling on the four DD coils can be obtained through simulink simulation. Fig. 9 As shown. It can be seen that at this time, the cross coupling between the energy coil on the primary side DD coil 1 and the secondary side DD coil 1 is greater, and the inductive crosstalk on the coil is also greater. The interference can be partially compensated by connecting the DD coils in series. Fig.10 The figure shows the interference between the two ends of the series DD coil. It can be seen that there is still a certain amount of crosstalk between the two ends of the series DD coil. The signal coil connected to the signal transmission loop can be determined by comparing the crosstalk voltage between the single DD coil and the series DD coil to ensure that the crosstalk in the signal transmission loop is minimized. Fig.10 The interference voltage induced on the single DD coil is retained.

[0097] When the secondary coupling mechanism is offset by 10cm on the X axis and -10cm on the Y axis, the mutual inductance between the coils in the coupling mechanism is obtained through comsol simulation, and the interference voltage induced by cross coupling on the four DD coils can be obtained through simulink simulation. Fig.11As shown. It can be seen that the voltages induced on the four DD coils are equal in magnitude and opposite in phase, so the interference can be compensated by connecting the coils in reverse series. Fig.12 The figure shows the interference magnitude (U PCDD is the interference voltage after the two DD coils on the primary side are connected in reverse series, U SCDD is the interference voltage after the two DD coils on the secondary side are connected in reverse series), it can be seen that the crosstalk between the two ends of the reverse series DD coils is approximately 0. For comparison, Fig.12 The interference voltage induced on the single DD coil is retained.

[0098] Therefore, the separated-channel energy and signal simultaneous transmission system and method based on a double-layer orthogonal DD coil proposed in the embodiment of the present invention can reduce the crosstalk of energy transmission on signal transmission when the secondary coupling mechanism is offset within the four-quadrant range. When the secondary coupling mechanism is facing, only offset in the X-axis, only offset in the Y-axis, or when the offset distances of the X and Y axes are the same, the interference voltage can be made close to 0 or minimized by switching the switch.

[0099] The above embodiments are preferred implementation modes of the present invention, but the implementation modes of the present invention are not limited to the above embodiments. Any other changes, modifications, substitutions, combinations, and simplifications that do not deviate from the spirit and principles of the present invention should be equivalent replacement methods and are included in the protection scope of the present invention.

Claims

1. A separated channel energy and signal transmission system based on a double-layer orthogonal DD coil is provided with an energy transmission channel and a signal transmission channel. The energy transmission channel is provided with a primary energy coil and a secondary energy coil, and is characterized in that: The signal transmission channel is provided with a primary first DD coil and a primary second DD coil placed orthogonally, and is also provided with a secondary first DD coil and a secondary second DD coil placed orthogonally; the primary energy coil, the primary first DD coil, and the primary second DD coil are stacked on the primary side to form a primary coupling mechanism, the secondary second DD coil, the secondary first DD coil, and the secondary energy coil are stacked on the secondary side to form a secondary coupling mechanism, and the primary coupling mechanism is symmetrically designed with the secondary coupling mechanism.

2. The split-channel simultaneous transmission system based on double-layer orthogonal DD coils according to claim 1 is characterized in that: The signal transmission channel is also provided with a primary side DD coil control circuit; the primary side DD coil control circuit includes a primary side modulation and demodulation module, including a primary side switch circuit connected between the primary side first matching network, the primary side second matching network, and the primary side modulation and demodulation module, and a primary side controller connected to the primary side modulation and demodulation module and the primary side switch circuit; The primary side controller is used to control the primary side switch circuit to realize the following four primary side wiring conditions: Primary side wiring situation 1: only the primary side second DD coil is connected to the primary side modulation and demodulation module; Primary side wiring situation 2: only the primary side first DD coil is connected to the primary side modulation and demodulation module; Primary side wiring situation three: the primary side first DD coil and the primary side second DD coil are connected in series and then connected to the primary side modulation and demodulation module; Primary side wiring situation 4: the primary side first DD coil and the primary side second DD coil are connected in reverse series and then connected to the primary side modulation and demodulation module.

3. The split-channel simultaneous transmission system based on double-layer orthogonal DD coils according to claim 2 is characterized in that: The signal transmission channel is also provided with a secondary side DD coil control circuit; the primary side DD coil control circuit includes a secondary side modulation and demodulation module, including a secondary side switch circuit connected between the secondary side first matching network, the secondary side second matching network, and the secondary side modulation and demodulation module, and a secondary side controller connected to the secondary side modulation and demodulation module and the secondary side switch circuit; The secondary side controller is used to control the secondary side switch circuit to realize the following four secondary side wiring conditions: Secondary side wiring situation 1: only the second DD coil of the secondary side is connected to the secondary side modulation and demodulation module; Secondary side wiring situation 2: only the secondary side first DD coil is connected to the secondary side modulation and demodulation module; Secondary side wiring situation three: the secondary side first DD coil and the secondary side second DD coil are connected in series and then connected to the secondary side modulation and demodulation module; Secondary side wiring situation 4: the secondary side first DD coil and the secondary side second DD coil are connected in reverse series and then connected to the secondary side modulation and demodulation module.

4. The split-channel simultaneous transmission system based on double-layer orthogonal DD coils according to claim 3 is characterized in that: Taking the center of the primary first DD coil as the coordinate origin, the arrangement direction of the two D-shaped coils of the primary first DD coil as the X-axis, and the direction perpendicular to the X-axis on the primary first DD coil as the Y-axis, under different offset conditions, the primary controller controls the primary switch circuit, and the secondary controller controls the secondary switch circuit to achieve different wiring conditions, specifically: When the primary coupling mechanism or the secondary coupling mechanism is in the first offset region within the range of the central angle (2π-a, a] and (3a+2b, 5a+2b], the primary controller controls the primary switch circuit to implement the primary wiring condition 1, and the secondary controller controls the secondary switch circuit to implement the secondary wiring condition 1, a∈[25°, 30°], b=90°-2a; When the primary coupling mechanism or the secondary coupling mechanism is in the second offset region within the range of the central angle (a+b, 3a+b] and (5a+3b, 7a+3b], the primary controller controls the primary switch circuit to implement the primary wiring condition 2, and the secondary controller controls the secondary switch circuit to implement the secondary wiring condition 2; When the primary side coupling mechanism or the secondary side coupling mechanism is in a third offset region within the range of the central angle (a, a+b] and (5a+2b, 5a+3b], the primary side controller controls the primary side switch circuit to implement the primary side wiring situation three, and the secondary side controller controls the secondary side switch circuit to implement the secondary side wiring situation three; When the primary side coupling mechanism or the secondary side coupling mechanism is in the fourth offset area within the range of the central angle (3a+b, 3a+2b] and (7a+3b, 7a+4b], the primary side controller controls the primary side switch circuit to realize the primary side wiring condition four, and the secondary side controller controls the secondary side switch circuit to realize the secondary side wiring condition four.

5. The split-channel simultaneous transmission system based on double-layer orthogonal DD coils according to claim 4 is characterized in that: The primary side DD coil control circuit is further provided with a primary first tuning network and a primary second tuning network respectively connected to the primary first DD coil and the primary second DD coil, and the secondary side DD coil control circuit is further provided with a secondary first tuning network and a secondary second tuning network respectively connected to the secondary first DD coil and the secondary second DD coil.

6. The split-channel simultaneous transmission system based on double-layer orthogonal DD coils according to claim 5 is characterized in that: The primary switch circuit is provided with single-pole three-throw switches S1 and S3 and a single-pole double-throw switch S2; the fixed end of the switch S1 is connected to the second end of the primary first harmonic network, the first movable end and the second movable end of the switch S1 are respectively connected to the first end and the second end of the primary second harmonic network, and the third movable end of the switch S1 is suspended; the fixed end of the switch S2 is connected to the first input and output end of the primary modem module, the first movable end of the switch S2 is connected to the first end of the primary first harmonic network, and the second movable end of the switch S2 is connected to the first end of the primary second harmonic network; the fixed end of the switch S3 is connected to the second input and output end of the primary modem module, the first movable end of the switch S3 is connected to the second end of the primary first harmonic network, the second movable end of the switch S3 is connected to the second movable end of the switch S2, and the third movable end of the switch S3 is connected to the second end of the primary second harmonic network; When the switch S1 is cut toward its third moving end, the switch S2 is cut toward its first moving end, and the switch S3 is cut toward its first moving end, the primary side wiring situation 1 is realized; When the switch S1 is cut toward its third moving end, the switch S2 is cut toward its second moving end, and the switch S3 is cut toward its third moving end, the primary side wiring situation 2 is realized; When the switch S1 is cut toward its second moving end, the switch S2 is cut toward its first moving end, and the switch S3 is cut toward its second moving end, the primary side wiring situation 3 is realized; When the blade of the switch S1 is cut toward its first moving end, the switch S2 is cut toward its first moving end, and the switch S3 is cut toward its third moving end, the primary side wiring situation four is realized.

7. The split-channel simultaneous transmission system based on double-layer orthogonal DD coils according to claim 5 is characterized in that: When the signal is transmitted from the primary side to the secondary side, the primary side modulation and demodulation module is used to modulate the signal, and the secondary side modulation and demodulation module is used to demodulate the signal. The secondary side controller is also used to detect the interference voltage of the four DD coils of the secondary side modulation and demodulation module under four primary side wiring conditions and four secondary side wiring conditions, and control the primary side switching circuit, the primary side wiring condition with the smallest interference voltage of the secondary side switching circuit and the secondary side wiring condition according to the size of the primary-secondary side interference voltage.

8. The split-channel simultaneous transmission system based on double-layer orthogonal DD coils according to claim 7 is characterized in that: The secondary side switch circuit adopts the same circuit as the primary side switch circuit; When the signal is transmitted from the secondary side to the primary side, the secondary side modulation and demodulation module is used to modulate the signal, and the primary side modulation and demodulation module is used to demodulate the signal. The primary side controller is also used to detect the interference voltage of the four DD coils of the primary side modulation and demodulation module under four primary side wiring conditions and four secondary side wiring conditions, and control the primary side switching circuit and the secondary side switching circuit to achieve the primary side wiring condition and the secondary side wiring condition with the minimum interference voltage according to the size of the primary-secondary side interference voltage.

9. A split-channel energy-signal simultaneous transmission method based on a double-layer orthogonal DD coil, characterized in that: The method applied to the split-channel simultaneous transmission system based on double-layer orthogonal DD coils as described in any one of claims 4 to 8 comprises: When the position of the secondary coupling mechanism is fixed, determine whether the secondary coupling mechanism is offset in the first offset area, the second offset area, the third offset area or the fourth offset area. If so, control the primary switching circuit and the secondary switching circuit to realize a set of primary wiring conditions and secondary wiring conditions corresponding to the offset conditions. Otherwise, realize any one of the four wiring conditions.

10. A split-channel energy-signal simultaneous transmission method based on a double-layer orthogonal DD coil, characterized in that: The method applied to the split-channel simultaneous transmission system based on double-layer orthogonal DD coils as described in any one of claims 4 to 8 comprises: When the position of the secondary coupling mechanism is fixed, the primary switch circuit and the secondary switch circuit are controlled to sequentially realize the corresponding four primary wiring conditions and secondary wiring conditions, and the interference voltage of the four DD coils in each set of primary wiring conditions and secondary wiring conditions is detected; The primary side switch circuit and the secondary side switch circuit are controlled to switch to a set of primary side wiring conditions and secondary side wiring conditions with the minimum interference voltage.

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