Research And Development Of Low Power And High Frequency Isolated Power Transmission System

In the field of electromagnetic exploration,electromagnetic transmitter is an important part of it.In the field of marine electromagnetic exploration,the marine controllable source electromagnetic transmitter plays an irreplaceable role.The Magnitude of the current and the diversity of the frequency directly determine the performance of the current and the final inversion results.In recent years,the development of marine controllable source electromagnetic transmitter has made some remarkable achievements,but there is still a certain gap compared with the most advanced level in the world.In the past,there are various restrictions on the continuous increase of the emission current.It is not possible to continue to go the old road to overtake.Therefore,we should find a new way.This paper aims to study a new type of low-power high frequency isolation power transmission system,which completely changes the structure of the inverter system,so as to change the inverter waveform,improve the inverter frequency,and completely change the transmission form of the power from the end to the bottom of the water,so as to reduce the equipment volume and improve the system performance.The traditional inverter system is changed to single power cascade multilevel inverter system.Because the ship load power supply can only outputs one DC signal,the single power cascade multilevel inverter system is powered by independent DC power supply,and the driving board of IGBT is designed.The FPGA generates up to14 SPWM signals to control 14 IGBT Modules to generate a seven level AC,and after filtering,it can be used to control 14 IGBT modules to generate a seven level AC power supply.The AC generating the approximate sinusoidal signal greatly improves the efficiency of the transformer,reduces the harmonic component in the system circuit and improves the safety of the system.The transformer is changed from 400 Hz to 1000 Hz if transformer,which greatly reduces the volume of transformer and improves efficiency.In addition,the traditional AC transmission is changed to DC transmission,which greatly reduces the power loss in the process of power transmission,and solves the problem of three-phase imbalance.Finally,the single power cascade multilevel inverter is used to transmit the AC signal with approximate sinusoidal,which can obtain better detection data and have a positive effect on the better results obtained in the subsequent inversion.In addition,the power module and rectifier module are integrated on a PCB board to supply power to the drive board and inverter system.In order to develop the high power and high current ocean controlled source electromagnetic transmitter in the future,this design designs a prototype for it,which runs through all the principles on the basis of low power.After many tests,when the input voltage is 10 VAC,a seven level AC signal with peak to peak value close to 30 V is generated,and after the step-up transformer,a sinusoidal AC signal with peak to peak value close to 150 V is output,and the DC voltage after rectification and filtering reaches 210 v,which verifies the feasibility of this system,and provides important reference for high-power and high current ocean controlled source electromagnetic transmitter in the future Technical reference to be provided.