CAJ | 학술논문

电磁感应式非接触能量传输(inductive power transfer, IPT)的半导体发光二极管(light-emitting diode,LED)照明系统具有便利、灵活、安全等优点.为提高IPT的传输效率, IPT松耦合变压器两边需引入补偿网络.补偿后的IPT变换器输出特性十分复杂,其输出电压或电流与变压器参数、补偿结构和参数、开关频率和负载均有关.而LED负载的等效阻抗易随温度变化,松耦合变压器的磁场并不均匀,难以设计,这些问题使得IPT LED驱动器难以直接输出LED需要的驱动电流.针对此问题,该文提出一种基于恒流源补偿网络的IPT LED驱动电路,恒流源补偿网络使得IPT输出恒流,解耦电流与负载阻抗的关系,通过提出的变压器参数和补偿参数设计方法,采用定频占空比控制,可直接输出LED 所需的电流,避免使用后级变换器,避免频率控制带来的频率分叉问题.该文还提出在给定变压器尺寸、气隙、负载范围、效率下的IPT系统综合设计方案.最后,搭建了一台20W的IPT LED驱动电路,实验结果证明所提出的补偿网络可以准确实现与负载无关的恒流输出,避免无功环流,实现较高的传输效率.
전자감응식비접촉능량전수(inductive power transfer, IPT)적반도체발광이겁관(light-emitting diode,LED)조명계통구유편리、령활、안전등우점.위제고IPT적전수효솔, IPT송우합변압기량변수인입보상망락.보상후적IPT변환기수출특성십분복잡,기수출전압혹전류여변압기삼수、보상결구화삼수、개관빈솔화부재균유관.이LED부재적등효조항역수온도변화,송우합변압기적자장병불균균,난이설계,저사문제사득IPT LED구동기난이직접수출LED수요적구동전류.침대차문제,해문제출일충기우항류원보상망락적IPT LED구동전로,항류원보상망락사득IPT수출항류,해우전류여부재조항적관계,통과제출적변압기삼수화보상삼수설계방법,채용정빈점공비공제,가직접수출LED 소수적전류,피면사용후급변환기,피면빈솔공제대래적빈솔분차문제.해문환제출재급정변압기척촌、기극、부재범위、효솔하적IPT계통종합설계방안.최후,탑건료일태20W적IPT LED구동전로,실험결과증명소제출적보상망락가이준학실현여부재무관적항류수출,피면무공배류,실현교고적전수효솔.
The inductive-power-transferred (IPT) light emitting diode (LED) lighting system is convenient, flexible and safe in many applications. To improve the transfer efficiency, compensation tanks are introduced. But output characteristics of the compensated IPT system are complex, having relations with transformer parameters, tank topologies and parameters, switching frequency, and load values. It is known that the equivalent resistances of LED loads readily vary with temperature. Moreover, the loosely coupled transformer is hard to design due to non-uniform magnetic field. These problems challenge the design of an IPT LED driver to provide the required LED current directly. To solve them, this paper proposed an IPT LED driver with the constant-current compensation tank, which decouples the effect of load resistance. With well-designed transformer and compensation tanks, the IPT LED driver can directly generate the required LED current via duty cycle control at the fixed frequency. This paper also gave design steps under the given specifications. The analysis, implementation and verification were detailed in this paper.