Strong anti-offset wireless power transmission system based on mode switching
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A wireless power transmission and anti-offset technology, applied in the direction of converting AC power input to DC power output, electrical components, circuit devices, etc., can solve problems such as low efficiency, high cost, and large volume of DC/DC converters
Active Publication Date: 2021-06-18
HARBIN INST OF TECH
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[0004] The purpose of the present invention is to solve the problems of large volume, high cost and low efficiency of the closed-loop control DC / DC converter of the subsequent stage due to the relatively large offset of the primary and secondary side coupling mechanism of the existing wireless power transmission system
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specific Embodiment approach 1
[0053] Specific embodiment one: the following combination figure 1 This embodiment will be described. The strong anti-offset wireless power transmission system based on mode switching described in this embodiment includes an inverter switching circuit 1, a primary side compensation circuit 2, a loosely coupled transformer 3, a secondary side compensation circuit 4, and a rectifier switching circuit. circuit 5, DC / DC converter 6, primary side controller 10, primary side wireless communication module 9, secondary side controller 7 and secondary side wireless communication module 8;
[0054] The power input terminal of the inverter switching circuit 1 is connected to the source U in ; The signal output end of the inverter switching circuit 1 is connected to the signal input end of the primary side compensation circuit 2, and the signal output end of the primary side compensation circuit 2 is connected to the primary side self-inductance coil L of the loosely coupled transformer 3...
specific Embodiment
[0095] The coupling mechanism adopts such as figure 2 The plane square coil shown, the outer dimension of the unilateral coupling mechanism is 200×200×8mm 3 , the internal square hole size is 80×80mm 2 , the rated transmission distance is 50mm.
[0096] figure 2 The change curve of the coupling coefficient of the shown coupling mechanism with the offset vector M is as follows Figures 5(a) to 5(c) As shown, the offset process is briefly described as follows: at the beginning, the secondary coil is facing the primary coil, the transmission distance is equal to the rated value (50mm), and the coupling coefficient k=0.378 at this time; in Figure 5(a), the secondary coil Offset along the Z axis by 20mm, that is, M changes from (0,0,0) to (0,0,20), and the coupling coefficient decreases from 0.378 to 0.262; in Figure 5(b), the secondary coil is offset in the aforementioned Z axis. On the basis of the shift, continue to shift 40mm along the Y axis, that is, M changes from (0,0...
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Abstract
The invention discloses a strong anti-offset wireless power transmission system based on mode switching, belongs to the technical field of wireless power transmission, and particularly relates to the strong anti-offset wireless power transmission system based on mode switching. According to the invention, the problems of a large size, high cost and low efficiency of a post-stage closed-loop control DC/DC converter caused by a large offset of a primary and secondary side coupling mechanism of an existing wireless power transmission system are solved. A secondary side controller outputs a rectification switching instruction to a control signal input end of a rectification switching circuit according to an upper limit and a lower limit of an output voltage of the rectification switching circuit and an input voltage of a DC/DC converter; the secondary side controller also transmits the inversion switching instruction to the secondary side wireless communication module through the secondary side wireless communication module; and a primary side wireless communication module receives the inversion switching instruction and transmits the inversion switching instruction to a primary side controller, and the primary side controller receives the inversion switching instruction and sends a state switching control signal to the inversion switching circuit. The system is suitable for the technical field of wireless power transmission.
Description
technical field [0001] The invention belongs to the technical field of wireless power transmission, and in particular relates to a strong anti-offset wireless power transmission system. Background technique [0002] Wireless power transmission technology can transmit power without using medium such as metal cables. It has the advantages of electrical isolation, convenience and safety, and can well solve some problems of cable power transmission. At present, wireless power transmission technology has been widely used in electric vehicles, implantable medical treatment, underwater detectors, robots and other fields. [0003] In most practical wireless power transmission systems, the relative offset of the primary and secondary side coupling mechanisms is bound to occur. In order to ensure that the system output voltage or current remains unchanged before and after the offset, a closed-loop controlled DC / DC converter needs to be added to the rear stage of the rectifier circuit...
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