A power transmitting terminal, a wireless power transmission device and a wireless power transmission method
A technology of transmitting end and electric energy, applied in the fields of wireless energy transmission, electric energy transmitting end, and wireless energy transmission device, can solve the problems of complicated control system, inapplicability, high cost of voltage-controlled capacitors, etc., and achieve simplified system structure and simple system structure. Effect
Active Publication Date: 2018-11-13
NINGBO WEIE ELECTRONICS TECH CO LTD
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Problems solved by technology
[0005] For the control scheme of impedance matching, one is that multiple feedback loops are required in the circuit system to adjust the voltage bias of the voltage-controlled capacitor in the matching circuit, thereby changing the capacitance of the voltage-controlled capacitor and adjusting the resonance parameters of the system. This makes it possible to work at a fixed frequency. The capacitance of the voltage-controlled capacitor is adjusted through a real-time feedback system. The control system is very complicated, and the high-voltage voltage-controlled capacitor is expensive.
Another impedance matching scheme such as figure 2 As shown, by adding a coil to the primary and secondary sides, an input coil and an output coil (such as figure 2 Lg or L in L As shown), the impedance matching network of the system can be changed by manually adjusting the coupling relationship between the input coil and the primary coil, and the coupling relationship between the output coil and the secondary coil, but manual adjustment is obviously not suitable for the relative position of the primary and secondary coils. Changes and load fluctuations
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[0064] Several preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings, but the present invention is not limited to these embodiments. The present invention covers any alternatives, modifications, equivalent methods and schemes made on the spirit and scope of the present invention. In order to provide the public with a thorough understanding of the present invention, specific details are set forth in the following preferred embodiments of the present invention, but those skilled in the art can fully understand the present invention without the description of these details.
[0065] Additionally, those of ordinary skill in the art will appreciate that the drawings provided herein are for illustrative purposes and are not necessarily drawn to scale.
[0066] Meanwhile, it should be understood that in the following description, "circuit" refers to a conductive loop formed by at least one element or sub-circuit t...
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The invention discloses a power transmitting terminal, a wireless power transmission device and a wireless power transmission method. A current signal of a primary side coil is conditioned through a current modulation circuit, so that the current flowing through the primary side coil becomes an alternating current signal constant in frequency and amplitude. In this way, it can be guaranteed that energy transmitted to a secondary side by a primary side will not change whether the coupling conditions of the secondary side and the primary side are good or not or under the condition that the load of the secondary side changes, and therefore energy transmission efficiency can be maximized. Compared with the prior art, no complex feedback mechanism is required, and the design can be superior to the design of a secondary side circuit. The applied system is simple in structure, capable of being applied to a complex environment and high in efficiency.
Description
technical field [0001] The present invention relates to the technical field of power electronics, and more specifically, relates to a power transmitter, a wireless power transmission device and a wireless power transmission method. Background technique [0002] Wireless power transmission technology is widely used in the field of electronic products due to its convenient and practical features. At present, there are mainly two ways to realize wireless power transmission: magnetic induction and magnetic resonance. Magnetic induction is very suitable for applications due to the limitation of transmission distance. Limited, magnetic resonance wireless power transmission can realize long-distance, high-power power transmission, and can be widely used in charging and power supply of electronic terminals, electric vehicles, underwater, underground and other electrical equipment. [0003] The magnetic resonance wireless power transmission device mainly includes a transmitting part ...
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IPC IPC(8): H02J50/12H02J7/02
CPCH02J5/005
Inventor 钟霞
Owner NINGBO WEIE ELECTRONICS TECH CO LTD