为了解决地电阻率观测中台站受环境干扰而影响观测等问题，我国地震工作者正在研究和尝试基于交流电法的新型地电阻率观测系统，这种新型观测系统主要由低频稳流电源系统和接收系统组成。本文对低频稳流电源系统的关键技术进行了分析，并介绍了电源系统的功率变换电路和逆变输出电路等关键环节设计，最后对研发的具有大功率可变频稳流输出性能的低频电源样机的输出性能进行了测试。测试结果表明，该型电源样机的各项技术指标均达到了设计要求，其输出性能良好。

Many geoelectric resistivity observation stations have been disturbed by electromagnetic interference. In order to solve this problem,the Chinese scientists and technicians have made a lot of effort to a new observation system based on the AC power supply. The new observation system mainly consists of two parts:a low frequency transmit system and a reception system. The key technology of the transmitter system is analyzed in the paper. And we introduce the technology of SPWM and the research of high frequency voltage transformer. Finally,the transmitter system is tested in laboratory. The test results show that the transmitter provides a good output function and its specifications can meet the requirements.

P315

地震科技星火计划（XH14023）资助