In this paper, an equivalent model of a class DE power ampliifer with a LC paral el resonant load is analyzed, so as to improve the efifciency of transmitting circuit for induction logging tools. The simulated efifciency is over 95%, based on the output data of a simulation with spice model. In order to control the amplitude of transmitting current, a control ing scheme with switching power supply is simulated. According to the simulation data, an analysis on the impact factors of the overal efifciency is given.%本文针对LC并联谐振负载，分析了DE类功率放大器的等效模型，以研究如何提升感应测井仪发射电路的效率；利用器件的Spice模型在软件上对电路进行了仿真，效率达到95%以上。为控制发射电流的幅度，对一种基于开关电源的幅度调节方案作了仿真，根据结果分析了影响发射电路整体效率的因数。
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