Abstract
The static wireless charging of electric vehicles is more convenient than traditional charging methods, but due to man-made parking will cause the coil to shift, which will cause the transmission power of the system to fluctuate and affect the stability of the system. Through the analysis of the traditional doublesided resonant system, it is found that it is more sensitive to the coupling coefficient k and the primary current will increase suddenly when k approaches zero. In order to solve these two problems, this paper compares four different resonance conditions and performs a large number of simulation experiments show that the antioffset performance of the system is the highest when both the primary and secondary sides are designed to be detuned, but a certain efficiency is sacrificed. When the bilateral detuned system is in the range of 2.4 times the coupling coefficient k, then the fluctuation of transmission power is less than 15%, and the maximum transmission efficiency is 58%. It has good anti-offset ability. And when k approaches zero, the primary current will not increase suddenly. The security performance of the system is greatly improved.
Highlights
With the advent of the new era, new energy Electric Vehicles (EV) have entered people's field of vision
In order to solve the above problems, this paper proposes to apply the dual-sided non-resonant design to EV Wireless Power Transfer (WPT) after comparing four different resonance modes
For the traditional EV WPT system with bilateral resonance, when the coupling coefficient of the two coils tends to zero, the current on the primary side will suddenly increase and there is a risk of overcurrent, and it is more sensitive to the coupling coefficient
Summary
With the advent of the new era, new energy Electric Vehicles (EV) have entered people's field of vision. There are two main research points to improve the anti-offset capability of EV WPT: the magnetic coupling structure of the system and the compensation network. The magnetic flux path length of this coil is approximately twice that of the circular coil Another way to improve the anti-offset performance of EV WPT is to use a suitable compensation network. The above compensation topology can improve the anti-offset performance of the coil, but the cost and complexity of the system increase . The transmitting and receiving side coils use full resonance to make the WPT system have better transmission performance, but according to the literature [7], when the coupling coefficient k changes, the fully resonant SS topology is extremely susceptible, and when k gradually approaches zero, the system will experience excessive current. In order to simplify the calculation, the primary and secondary compensation capacitors and the parasitic resistors of the coils on both sides of the main circuit need to be ignored, and the simplified mutual inductance circuit model is shown in figure 3
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