Optimization Method of Impedance Matching Network for Electric Field Coupled Wireless Power Transfer
A technology of impedance matching network and wireless power transmission, which is applied in the direction of impedance network, multi-terminal pair network, electrical components, etc. It can solve the problems that cannot be ignored, the influence of parasitic resistance voltage gain is large, and the transmission capacity is reduced, and the effect is obvious.
Active Publication Date: 2021-03-16
杭州电子科技大学温州研究院有限公司 +1
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Problems solved by technology
However, in the application of electric field coupling in medium and long-distance transmission, the shortcoming of a sharp drop in transmission capability has always troubled researchers.
However, in the design process, the following problems may occur: ① Insufficient circuit stability
Including when there is an error between the component parameters and the actual nominal value, and the operating frequency of the circuit jitters, there is a large difference between the input and output voltage gain of the circuit and the ideal value
②The parasitic resistance of the inductor used in the matching network has a great influence on the voltage gain, which cannot be ignored in the circuit
Method used
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[0043] The present invention will be further described below in conjunction with accompanying drawing.
[0044] An optimization method for an impedance matching network for electric field coupled wireless power transfer is applied to an electric field coupled wireless power transfer circuit.
[0045] Such as figure 1 As shown, the electric field coupling wireless power transmission circuit includes a signal source ①, an impedance matching network ②, a coupling plate group ③ and a load ④. Signal source ① includes DC power supply and inverter. Wherein, the DC power supply provides a DC voltage for the circuit to work. The inverter converts the DC signal into an AC signal that can be transmitted across the capacitance of the substrate. The impedance matching network ② is used to compensate the imaginary part impedance in the circuit to reduce the loss of reactive power, and the object of the present invention is to design the impedance matching network. The coupling plate gro...
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The invention discloses an optimization method of an impedance matching network for electric field coupling wireless power transmission. In the application of electric field coupling in medium and long-distance transmission, the shortcoming of a sharp drop in transmission capability has always plagued researchers. The steps of the present invention are as follows: Step 1, obtain the internal resistance of the signal source; Step 2, establish the expression of each element in the impedance matching network; Step 3, establish the functional relationship between the voltage gain and the actual operating frequency; Step 4, change the parameter simulation voltage Curve. The present invention discusses the impact of the operating frequency jitter and the parasitic resistance of the inductor on the voltage gain of the system when the component parameters are accurate, and obtains a parameter selection range that can make the stability of the circuit and the voltage gain ideal during parameter design. . Through the parameter design and optimization process of the present invention, unnecessary damage to the circuit during the working process can be avoided.
Description
technical field [0001] The invention belongs to the technical field of electric field coupling wireless power transmission, and in particular relates to an optimization method of an impedance matching network used for electric field coupling wireless power transmission. Background technique [0002] With the development of wireless power transfer technology, wireless power transfer systems based on various transmission forms are used in implanted medical treatment, electric vehicle power supply and consumer electronics charging and other fields. At present, the most widely used and most mature technology is based on the magnetic field coupling wireless power transmission technology between coils. In comparison, electric field coupling is a dual working method of the same magnetic field coupling, and only light and cheap aluminum or copper plates are used as The transmitter and receiver poles, and there are metal objects around them, the leakage electric field will not cause ...
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IPC IPC(8): H02J50/05H03H7/38G06F30/36
CPCH02J50/05H03H7/38G06F30/36
Inventor 程瑜华夏宏飞李文钧王高峰
Owner 杭州电子科技大学温州研究院有限公司