Electromagnetic transmitter

Abstract

The invention relates to an electromagnetic transmitter. The electromagnetic transmitter comprises an electric generator set, a three-phase rectifier bridge, filter capacitors, a first level inverter bridge, a resonant inductor, an insulation value capacitor, a high-frequency transformer, a high-frequency rectifier bridge, a LC filter circuit and a second level inverter bridge. The electric generator set, the three-phase rectifier bridge, the filter capacitors, the first level inverter bridge, the high-frequency transformer, the high-frequency rectifier bridge, the LC filter circuit and the second level inverter bridge and an output port are successively connected. The resonant inductor and the insulation value capacitor are connected in series to a line between the first level inverter bridge and a primary side of the high-frequency transformer. The filter capacitors are connected in parallel to each power device of the first level inverter bridge. The filter capacitors, the resonant inductor and the insulation value capacitor form a resonance loop. By using the electromagnetic transmitter, a soft switch technology is used in the first level inverter bridge so that the voltage of the power devices of the first level inverter bridge during an on or off process is zero; zero voltage switch of the power devices is realized.

Description

technical field [0001] The present invention relates to the technical field of power rectification and inverter, in particular to an electromagnetic transmitter. Background technique [0002] The electromagnetic transmitter constructs the distribution information of the conductivity of the underground medium by obtaining the response of the earth medium to the incident electromagnetic field. Metal ores usually have good electrical conductivity, so the electromagnetic method is the most effective geophysical prospecting method for finding metal ores. [0003] With the rapid development of modern power electronics technology and devices, the topology of the main circuit of the electromagnetic transmitter is also changing. At present, the mainstream topology of electromagnetic transmitters is based on two-stage inverters, and its power part is essentially a switching power supply. Increasing the output power of the transmitter will inevitably lead to an increase in the voltage...

AI Technical Summary

Problems solved by technology

At present, the mainstream topology of electromagnetic transmitters is based on two-stage inverters, and its power part is essentially a switching power supply. Increasing the output power of the transmitter will inevitably lead to an increase in the voltage or current borne by the switching tube. If only Using ordinary pulse width modulation technology will cause a substantial increase in the switching loss of the switch tube, and at the same time generate a serious voltage and current spike, which will increase the electrical stress of the device in the circuit, burn the device, and will also cause serious damage. Electromagnetic Interference Problems

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