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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, each street light is fixed and immovable in a lighting system, but if it is possible to dispose a movable street light in a large area such as a square, it can not only save valuable power resources, but also greatly improve the light source Use efficiency, that is, use more power resources where appropriate and vice versa to achieve green energy savings in urban lighting. Magnetic coupling resonant wireless charging technology with high efficiency, high security and long-distance transmission and other advantages, but when the smart street lamp in the moving process, the receiving coil and the sending coil mutual inductance change, resulting in power down. That is, the load can only maintain the optimal power in a relatively narrow range, which has a great impact on the equipment with high power stability requirements. This paper analyzes the key factors that affect the load power, and proposes to use the DC / DC converter to change the load reflection value to achieve the matching effect. That is, when the coil mutual inductance 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 can be in a best condition in a wide range.