Research Of Surface Electromagnetic Probe Transmitter Based On DSP&FPGA

As essential equipment for electromagnetic exploration, electromagnetictransmitter reverse the steady power supply with desired frequency and transmit thepower through grounding electrodes, in order to obtain effective electromagnetic fieldfor deep geophysical exploration. To obtain effective geophysical data during deepexploration, the transmitter needs to be high-voltage, high-current, with high-accuracyoutput, and yet compact and light.Switching power supply has the remarkable characteristics of high efficiency,small size and lightweight. Countries all over the world have extensive application inswitching power, especially research on high power high frequency switching powernowadays has already become the main research field of power electronics and manynew research directions has derived from it. Now, the rapid development of controltheory, power electronics technology and semiconductor materials provide a powerfulsupport for the development of high voltage high power switching power supply.Through the engineering research project, based on geological exploration ofhigh-power transmitter in the field of technical specifications is to design ahigh-voltage power switching power supply topology, and complete the topologytheoretical analysis, computer simulation, the main power circuit is built on the basisof simulation, and the main control circuit is designed based on DSP&FPGA. Themain control circuit is consist by four parts: GPS data acquiring and processing, thesystem of data processing based on TMS320F2812, the system of data processingbased on EP2C8Q208and the PC control system of the electromagnetic transmitter.The experiment of open loop and closed loop is completed in the laboratory bythe20kW electromagnetic transmitter which based on the DSP&FPGA, verifyingthe validity of the topology and the effectiveness of the control method. Through thetransmitting contrast experiments outdoors with the foreign advanced andrepresentative transmitter. By the quality of the transmitting waveform, verifyingthat the design of the transmitter is better than that of representative of foreignadvanced level transmitter. The outdoors geological exploration experiments show that the performance of electromagnetic transmitter which designed in this paper canbe competent for the outdoor geological exploration.