Study On IPT Charging Systems With The Characteristics Of Misalignment Tolerant In 2-dimension Plane And Constant Voltage Output

The inductive power transfer(IPT)technology based on the principle of near-field coupling of high frequency electromagnetic field has developed rapidly in the past 20 years.Because the IPT technology is safe and reliable,and it has the advantage of not being affected by water or chemicals and high environmental affinity,the IPT technology has broad application prospects.In the process of IPT charging,it is usually required that the system output constant voltage(CV)to variable load,and physical misalignments between the magnetic couplers are unavoidable.Therefore,it is necessary to study the IPT charging system with misalignment tolerant and CV output characteristics.In order to reduce the complexity of the IPT charging systems with feedback control schemes,and ensure CV output of IPT charging system when the magnetic couplers are misalignment and the load changes at the same time,this paper firstly analyses the LCC-S and S-LCC topological circuits.The analysis shows that both of the two topological circuits have the characteristic of constant voltage output,but the difference is that the output voltage of the former is linear related to the mutual inductance,while the output voltage of the latter is inverse proportional to the mutual inductance.Based on this characteristic,a hybrid LCC-S and S-LCC topology circuit was proposed and analyzed.The analysis shows that hybrid topology circuit has the characteristics of misalignment tolerant and CV output under the condition of zero cross-coupling and reasonable element parameters.To satisfy the zero crosscoupling condition,the double-D quadrature(DDQ)pad was selected as the magnetic coupler,and its applicability to the proposed hybrid topology circuit was analyzed.The analysis shows that the IPT system with misalignment tolerant and CV output characteristics can be realized in two-dimensional plane.To improve the effect of misalignment tolerant and CV output,a parameter design method was proposed.After parameter design,the effect of the IPT system with misalignment tolerant and CV output is analyzed theoretically.The analysis shows that the proposed methods are effective theoretically.Finally,an experimental prototype of 1kW system was designed and constructed,to investigate the IPT system with misalignment tolerant and CV output characteristics in lateral and vertical directions experimentally.The experimental results show that the output voltage of the IPT system is within the required deviation range when the misalignment in a certain range of lateral and vertical directions and the load changes in a certain range,which verifies the proposed methods are effective and feasible.In addition,the proposed methods are with the following advantages: no complex feedback control schemes and almost no reactive input.