谐振式无线充电照明调控系统功率优化

Research on the Power Characteristic of Magnetic Resonance Based Wireless Power Transfer

目前,在照明系统中,每一个路灯都是固定和不可移动的,但是若能在广场等大型区域配置可移动的路灯,既可以节省宝贵的电力资源,也能够在很大程度上提高光源的使用效率,即在合适的地方动用更多的电力资源,反之亦然,实现城市照明的绿色节能。磁耦合谐振式无线充电技术具有高效率、安全性高以及中远距离传输等优势,但是当智能路灯在移动过程中,接收线圈与发送线圈互感发生改变,从而导致功率下降。即负载仅能在一个比较狭小的范围内保持最优功率,这对于功率稳定性要求高的设备来说具有比较大的影响。该文对影响负载功率的关键因素进行分析,拟采用DC/DC变换器改变负载反射值,达到匹配效果。即当线圈互感发生改变时,动态调整Buck变换器的占空比D,实现最优功率负载匹配,使得系统负载接收功率能够在较宽范围内处于最佳状态。

At present, in the lighting system, each street is fixed and immobile, but if the square and other large areas can be configured to move the street lights, both can save valuable power resources, but also to a large extent to improve the light source The use of efficiency, that is, in the right place to use more power resources, and vice versa, to achieve the green energy of urban lighting. Magnetic coupling resonant wireless charging technology has the advantages of high efficiency, high security and long distance transmission. However, when the intelligent street lamp is moving, the mutual inductance of the receiving coil and the sending coil changes, resulting in power drop. That is, the load can only be in a relatively narrow range to maintain the optimal power, which for high power stability requirements of the device has a relatively large impact. In this paper, the key factors that affect the load power are analyzed, and the DC/DC converter is used to change the load reflection value to achieve the matching effect. When the mutual inductance of the coil changes, the duty cycle D of the Buck converter is dynamically adjusted to achieve the optimal power load matching, so that the system load receiving power is in the best condition in a wide range.