Full-duplex wireless power and information synchronous transmission system

Abstract

The invention discloses a full-duplex wireless electric energy and information synchronous transmission system, which belongs to the technical field of radio and comprises a direct-current power supply, an inversion unit, a control unit, a rectifying and filtering unit, a primary side compensation network, a primary side wave blocking network, a secondary side wave blocking network and a secondary side wave blocking network, the forward information modulation and injection unit is connected with the primary side coil in parallel, the secondary side compensation network and the first secondary side wave blocking network are connected with the secondary side coil in series, and the branch circuit is connected with the secondary side coil in parallel and formed by connecting a second secondary side wave blocking network and the forward information receiving and demodulation unit in series. A reverse information modulation and injection unit connected in parallel with a portion of the secondary side coil; and a reverse information reception and demodulation unit connected in parallel with a portion of the primary side coil. On the premise of ensuring the stability and the information transmission correctness, the energy transmission efficiency is improved, the waveform quality is ensured, and the communication efficiency is improved by realizing full-duplex communication.

Description

Technical Field

[0001] The present invention relates to the field of wireless power transmission, and particularly to a full-duplex wireless power and information synchronous transmission system. Background Art

[0002] Wireless power transmission systems have been widely applied in fields such as medical devices, portable electronic devices, smart homes, transportation, and aerospace due to their advantages of reliability, safety, convenience, and low maintenance costs.

[0003] In a wireless power transmission system, data transmission between the transmitter and the receiver is inevitably required for energy feedback control, system status monitoring, information upload of battery SOC, load and foreign object detection. In a simplex or half-duplex communication mode, information can only be transmitted unidirectionally or the transmission direction needs to be frequently switched, resulting in reduced channel utilization and low communication efficiency, and it is difficult to meet the requirements of high-real-time applications.

[0004] Based on this, there is an urgent need for a full-duplex wireless power and information synchronous transmission system to achieve wireless power transmission and two-way information transmission. Summary of the Invention

[0005] Aiming at the problem of low efficiency of wireless power and information transmission in the prior art, the purpose of the present invention is to provide a full-duplex wireless power and information synchronous transmission system to partially solve the above problems.

[0006] To achieve the above purpose, the technical solution of the present invention is as follows: A full-duplex wireless power and information synchronous transmission system includes an energy transmission channel and an information transmission channel; the energy transmission channel includes a DC power supply, an inverter unit, a control unit, a primary side compensation network, a primary side coil, a secondary side coil, a secondary side compensation network, and a rectification and filtering unit; the information transmission channel includes a primary side wave blocking network, a forward information modulation and injection unit, a reverse information receiving and demodulation unit, a secondary side first wave blocking network, a secondary side second wave blocking network, a forward information receiving and demodulation unit, and a reverse information modulation and injection unit; Among them, the primary side compensation network, the primary side coil, and the primary side wave blocking network are connected in series, and the forward information modulation and injection unit is connected in parallel with the primary side coil; the secondary side coil, the secondary side compensation network, and the secondary side first wave blocking network are connected in series, and the secondary side coil is connected in parallel with a branch formed by connecting the secondary side second wave blocking network and the forward information receiving and demodulation unit in series; the reverse information modulation and injection unit is connected in parallel with a part of the secondary side coil, and the reverse information receiving and demodulation unit is connected in parallel with a part of the primary side coil.

[0007] In some preferred embodiments, the control unit is used to output a driving signal with a frequency of f p to the inverter unit. Under the drive of the driving signal, the inverter unit converts direct current into alternating current with a frequency of f p , including alternating square wave voltage and sinusoidal current.

[0008] In some preferred embodiments, the control unit realizes the output of alternating current with a frequency of f p by controlling the switching frequency and conduction time of the inverter unit.

[0009] In some preferred embodiments, the primary side compensation network and the primary side coil form a primary side resonant network, and the secondary side compensation network and the secondary side coil form a secondary side resonant network. Moreover, the resonant frequencies of the primary side resonant network and the secondary side resonant network are f p .

[0010] In some preferred embodiments, both the primary side compensation network and the secondary side compensation network are LC high-order compensation topologies.

[0011] In some preferred embodiments, by designing the parameters of the primary side compensation network and the secondary side compensation network, the output of the primary side resonant network is made independent of the equivalent load of the secondary side resonant network.

[0012] In some preferred embodiments, both the forward information modulation and injection unit and the reverse information modulation and injection unit send information through ASK carrier modulation technology.

[0013] In some preferred embodiments, both the primary side coil and the secondary side coil are multi-winding structures.

[0014] With the above technical solution, the beneficial effects of the present invention are as follows: A full-duplex wireless power and information synchronous transmission system provided by the present invention aims to solve the problems of low energy transmission efficiency and inability to achieve full-duplex information transmission when wireless power and information are transmitted simultaneously, and improves the energy transmission efficiency and system stability. Based on the series-series compensation structure, the system innovatively introduces a wave blocking network, integrates forward and reverse information modulation and injection units as well as forward and reverse information receiving and demodulation units, and uses the parallel carrier injection method for information transmission. On the premise of ensuring stability and information transmission correctness, the system significantly improves the energy transmission efficiency and at the same time ensures the waveform quality. By realizing full-duplex communication, the system does not need to switch between the sending and receiving states, effectively avoiding the waiting time caused by state switching in the half-duplex or simplex mode, thus greatly improving the communication efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic structural diagram of a full-duplex wireless power and information synchronous transmission system of the present invention; Figure 2 It is a waveform diagram of the drive signal for controlling the inverter unit in the present invention; Figure 3 It is a voltage waveform diagram after inversion of the DC power supply in the present invention; Figure 4 It is a primary side current waveform diagram in the present invention; Figure 5 It is a secondary side current waveform diagram in the present invention; Figure 6 It is a comparison diagram of current waveforms after rectification and filtering by the rectification and filtering unit in the present invention; Figure 7 It is a waveform diagram of forward information modulation in the present invention; Figure 8 It is a voltage waveform diagram of the forward information receiving resistor in the present invention; Figure 9 It is a waveform diagram after forward information demodulation in the present invention; Figure 10 It is a schematic structural diagram of the coil in the present invention; Figure 11 It is a waveform diagram of reverse information modulation in the present invention; Figure 12 It is a voltage waveform diagram of the reverse information receiving resistor in the present invention; Figure 13 It is a waveform diagram after reverse information demodulation in the present invention.

[0016] In the figure: 1 - DC power supply, 2 - inverter unit, 3 - control unit, 4 - primary - side compensation network, 5 - primary - side coil, 6 - secondary - side coil, 7 - secondary - side compensation network, 8 - rectification and filtering unit, 9 - load, 10 - primary - side wave - blocking network, 11 - forward - information modulation and injection unit, 12 - reverse - information reception and demodulation unit, 13 - secondary - side first wave - blocking network, 14 - secondary - side second wave - blocking network, 15 - forward - information reception and demodulation unit, 16 - reverse - information modulation and injection unit. Detailed implementation manners

[0017] The following further describes the detailed implementation manners of the present invention with reference to the accompanying drawings. It should be noted here that the description of these implementation manners is used to help understand the present invention, but does not limit the present invention. In addition, the technical features involved in the various implementation manners of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0018] It should be noted that in the description of the present invention, the orientation or positional relationship indicated by terms such as "upper", "lower", "left", "right", "front", "rear", etc. is the description of the structure of the present invention based on the accompanying drawings, only for the convenience of describing the present invention simply, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be understood as a limitation of the present invention.

[0019] Regarding the "first" and "second" in this technical solution, they are only the appellation distinctions for the same or similar structures, or the corresponding structures with similar functions, not the arrangement of the importance of these structures, nor do they have a sequence, or compare sizes, or other meanings.

[0020] In addition, unless otherwise clearly specified and limited, the terms "installation" and "connection" should be understood in a broad sense. For example, the connection can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and can be the communication inside two structures. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to the general idea of the present invention and in connection with the specific context of this solution.

[0021] Embodiment A full - duplex wireless power and information synchronous transmission system, as Figure 1 shown, includes an energy - transmission channel and an information - transmission channel.

[0022] The energy - transmission channel includes a DC power supply 1, an inverter unit 2, a control unit 3, a primary - side compensation network 4, a primary - side coil 5, a secondary - side coil 6, a secondary - side compensation network 7, and a rectification and filtering unit 8.

[0023] The control unit 3 is used to output a drive signal with a frequency of f p to the inverter unit 2. As shown in Figure 2 , the drive signal is two complementary PWM waves. Specifically, the control unit 3 realizes the output of alternating current with a frequency of f p by controlling the switching frequency and conduction time of the switching tubes in the inverter unit 2.

[0024] Under the drive of this drive signal, the inverter unit 2 inverses the direct current output by the DC power supply 1 into alternating current with a frequency of f p , including an alternating square wave voltage and a sine wave current. The alternating square wave voltage is as shown in Figure 3 , and the sine wave current is as shown in Figure 4 .

[0025] Both the primary - side compensation network 4 and the secondary - side compensation network 7 are configured as LC high - order compensation topologies. The primary - side compensation network 4 is connected in series with the primary - side coil 5 to form a primary - side resonant network, and the secondary - side compensation network 7 is connected in series with the secondary - side coil 6 to form a secondary - side resonant network. Moreover, the resonant frequencies of the primary - side resonant network and the secondary - side resonant network are also f p . Through magnetic field coupling, the alternating current is transmitted to the secondary - side coil 6. The current waveform diagram of the secondary - side coil 6 is as shown in Figure 5 , and it is also a sine wave.

[0026] In this embodiment, the primary - side compensation network 4 and the secondary - side compensation network 7 are used to compensate the primary side and the secondary side respectively, so that the system resonates, thereby reducing losses. Additionally, by designing the parameters of the primary - side compensation network 4 and the secondary - side compensation network 7, the output of the primary - side resonant network can be made independent of the equivalent load of the secondary - side resonant network.

[0027] As shown in Figure 6 , the rectifier - filter unit 8 is used to rectify the alternating current to all positive (i.e., Figure 6 the upper half part), and then after filtering to absorb a part of the energy, a constant direct current (i.e., Figure 6 the lower half part) is obtained and output to the load 9.

[0028] During wireless power transmission, the DC power supply 1 first outputs a DC voltage to the inverter unit 2. The control unit 3 provides the necessary drive signal for the inverter unit 2 to drive its switching devices. After receiving the DC voltage output by the DC power supply 1, the inverter unit 2 inverses it into an AC voltage. After passing through the primary - side compensation network 4, the electric energy is transmitted from the primary - side coil 5 to the secondary - side coil 6, and then through the secondary - side compensation network 7, it is sent to the rectifier - filter unit 8, and after rectification and filtering, it is output to the load 9.

[0029] The information transmission channel includes a primary side wave blocking network 10, a forward information modulation and injection unit 11, a reverse information receiving and demodulation unit 12, a secondary side first wave blocking network 13, a secondary side second wave blocking network 14, a forward information receiving and demodulation unit 15, and a reverse information modulation and injection unit 16.

[0030] Among them, the primary side wave blocking network 10, the primary side compensation network 4, and the primary side coil 5 are connected in series, and the forward information modulation and injection unit 11 is connected in parallel with the primary side coil 5. The secondary side first wave blocking network 13, the secondary side compensation network 7, and the secondary side coil 6 are connected in series, and the secondary side second wave blocking network 14 is connected in series with the forward information receiving and demodulation unit 15 to form a series branch, and this series branch is connected in parallel with the secondary side coil 6.

[0031] The forward information modulation and injection unit 11 sends forward information through ASK carrier modulation technology, as Figure 7 shown. The waveform at the top in the figure is the original signal, the middle waveform is the carrier signal, and the waveform at the bottom is the modulated signal. This forward information is forward-transmitted to the secondary side through the primary side coil 5 connected in parallel.

[0032] The forward information receiving and demodulation unit 15 connected in parallel with the secondary side coil 6 has a forward information receiving resistor for receiving the modulated signal, and the voltage waveform diagram it receives is as Figure 8 shown. Its peak value increases with the increase of the sampling resistor. The forward information receiving and demodulation unit 15 can restore the forward information by demodulating this voltage waveform. As Figure 9 shown, it is the waveform diagram after demodulation of the forward information. After demodulation, it is a signal of 0 and 1, with a slight time delay. The two waveforms in the figure respectively represent the waveform signals before and after demodulation. The upper one is the original signal, and the lower one is the demodulated signal.

[0033] The primary side wave blocking network 10 and the secondary side first wave blocking network 13 are used to maintain the normal transmission of forward information in the circuit system. Of course, they can also be used to maintain the forward transmission of reverse information in the circuit system. The equivalent impedance of the primary side wave blocking network 10 and the secondary side first wave blocking network 13 during power transmission is zero, and they actually have no impact on power transmission. At the same time, in order to prevent the wave blocking network from generating unnecessary interference, a corresponding compensation capacitor or compensation inductor is added to each wave blocking network to avoid affecting the operation of the original system.

[0034] The second blocking network 14 on the secondary side, which is connected in series with the forward information receiving and demodulating unit 15, is used to prevent the electrical energy from affecting the reception and demodulation of forward information. The reason is that the second blocking network 14 on the secondary side, which is connected in series with the forward information receiving and demodulating unit 15, has an infinite equivalent impedance during power transmission, equivalent to an open circuit. Therefore, the role of the second blocking network 14 on the secondary side is to prevent the wireless power from affecting the forward reception and demodulation of information.

[0035] During forward information transmission, the forward information is transmitted from the primary side coil 5 to the secondary side coil 6 through the forward information modulation and injection unit 11, and then received by the forward information receiving and demodulating unit 15 after passing through the second blocking network 14 on the secondary side and the forward information receiving resistor, completing the forward transmission of the forward information.

[0036] In this embodiment, both the primary side coil 5 and the secondary side coil 6 are configured as multi-winding structures. The reverse information modulation and injection unit 16 is connected in parallel with a part of the secondary side coil 6, and the reverse information receiving and demodulating unit 12 is connected in parallel with a part of the primary side coil 5. As Figure 10 shown, it is a structural schematic diagram of the resonant coils (both the primary side coil 5 and the secondary side coil 6 are resonant coils), where L p1 and L s1 are the resonant coils through which the information is transmitted forward. L p2 and L s2 are the resonant coils through which the information is transmitted backward.

[0037] The reverse information modulation and injection unit 16 also sends reverse information through ASK carrier modulation technology. As Figure 11 shown, the waveform at the top in the figure is the original signal, the waveform in the middle is the carrier signal, and the waveform at the bottom is the modulated signal. This reverse information is transmitted backward to the primary side through a part of the secondary side coil 6.

[0038] The reverse information receiving and demodulating unit 12, which is connected in parallel with a part of the primary side coil 5, has a reverse information receiving resistor for receiving the modulated signal. The voltage waveform diagram it receives is as Figure 12 shown, and its peak value increases with the increase of the sampling resistor. The reverse information receiving and demodulating unit 12 demodulates this voltage waveform to be able to restore the reverse information. As Figure 13 shown, it is the waveform diagram after demodulation of the reverse information. After demodulation, it is a signal of 0 and 1, with a slight time delay. The two waveforms in the figure respectively represent the waveform signals before and after demodulation. The upper one is the original signal, and the lower one is the demodulated signal.

[0039] When performing reverse information transmission, the reverse information propagates from the secondary side coil 6 to the primary side coil 5 through the reverse information modulation and injection unit 16, and then is received by the reverse information receiving resistor and received and demodulated by the reverse information receiving and demodulation unit 12 to complete the reverse transmission of the reverse information.

[0040] An all-duplex wireless power and information synchronous transmission system provided by an embodiment of the present invention has a simple transmission process step, and the transmitted waveforms are all relatively ideal, which not only improves the accuracy of simultaneous energy and information transmission, but also can improve its transmission efficiency.

[0041] The embodiments of the present invention have been described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the described embodiments. For those skilled in the art, without departing from the principle and spirit of the present invention, various changes, modifications, substitutions, and variations to these embodiments still fall within the protection scope of the present invention.

Claims

1. A full-duplex wireless power and information synchronous transmission system, characterized in that: It includes an energy transmission channel and an information transmission channel; the energy transmission channel includes a DC power supply (1), an inverter unit (2), a control unit (3), a primary-side compensation network (4), a primary-side coil (5), a secondary-side coil (6), a secondary-side compensation network (7), and a rectification and filtering unit (8); the information transmission channel includes a primary-side wave blocking network (10), a forward information modulation and injection unit (11), a reverse information receiving and demodulation unit (12), a secondary-side first wave blocking network (13), a secondary-side second wave blocking network (14), a forward information receiving and demodulation unit (15), and a reverse information modulation and injection unit (16). Among them, the primary-side compensation network (4), the primary-side coil (5), and the primary-side wave blocking network (10) are connected in series, and the forward information modulation and injection unit (11) is connected in parallel with the primary-side coil (5); the secondary-side coil (6), the secondary-side compensation network (7), and the secondary-side first wave blocking network (13) are connected in series, and the secondary-side coil (6) is connected in parallel with the branch formed by the series connection of the secondary-side second wave blocking network (14) and the forward information receiving and demodulation unit (15); the reverse information modulation and injection unit (16) is connected in parallel with a part of the secondary-side coil (6), and the reverse information receiving and demodulation unit (12) is connected in parallel with a part of the primary-side coil (5).

2. The transmission system according to claim 1, wherein: The control unit (3) is used to output a driving signal with a frequency of f p to the inverter unit (2). The inverter unit (2) converts direct current into alternating current with a frequency of f p under the drive of the driving signal, including an alternating square wave voltage and a sine wave current.

3. The transmission system according to claim 2, characterized in that: The control unit (3) realizes the output of alternating current with a frequency of f p by controlling the switching frequency and conduction time of the inverter unit (2).

4. The transmission system according to claim 2, characterized in that: The primary side compensation network (4) and the primary side coil (5) form a primary side resonant network, the secondary side compensation network (7) and the secondary side coil (6) form a secondary side resonant network, and the resonant frequencies of the primary side resonant network and the secondary side resonant network are f p .

5. The transmission system according to claim 4, wherein: Both the primary-side compensation network (4) and the secondary-side compensation network (7) are LC high-order compensation topologies.

6. The transmission system according to claim 5, wherein: By designing the parameters of the primary-side compensation network (4) and the secondary-side compensation network (7), the output of the primary-side resonant network is made independent of the equivalent load of the secondary-side resonant network.

7. The transmission system according to claim 1, characterized in that: Both the forward information modulation and injection unit (11) and the reverse information modulation and injection unit (16) send information through ASK carrier modulation technology.

8. The transmission system according to any one of claims 1-7, characterized in that: Both the primary-side coil (5) and the secondary-side coil (6) are multi-winding structures.

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