Research On Measuring Technology Of High Frequecy Current Based On Wireless Energy Transfer

Magnetic resonance based on wireless power transfer is a novel and non-contact power transfer technique, which is based on non-radiative (near field) magnetic resonant induction to achieve power transfer safely and effectively. The transfer distance of energy could be more than 1 meter and the energy could also be transferred even if there are obstacles. Therefore it is significant to study wireless energy transfer.In the future, The technology of wireless energy transfer will be embodiment and can display the magnitude of current as its maturation. We need to research the magnitude of current in the wireless energy transfer receiver circuit based on coupled magnetic resonances in order to know the power and efficiency of the wireless energy transfer.The test emphasize on methods of current measurement based on wireless energy transfer. Compared with other means and the characteristics of wireless energy transfer. We choose the induced magnetic sensor. If adding load to the receiver circuit, the distributing capacitance and inductance will introduced in the high frequency circuit, and this will influence the resonance frequency.Induced magnetic sensor should use magnetic core due to the current is too small in receiver circuit. At first, the test studied the basic property of magnetic material,and choose Ni-Zn ferrite as magnetic core at last. By analyzing sensor's model,the characteristic of magnitude and phase is studied. Bandwidth is fond by adjust magnitude of mutual inductance M,resistance R,winding inductance L. By analyzing equivalent coupled resonant circuit and experimental research, the sensor's degree of linearity and precision is studied. Some factors which can affect sensor's performance are also validated by experiment. The test mainly studied probe of sensor, compensating circuit of sensor needs further investigation.