Electrical source transmitter device and control method with self-adaptive dummy load

Abstract

The invention relates to an electrical source transmitter device with a self-adaption dummy load and a control method. The electrical source transmitter device is characterized in that a generator or a battery pack is connected with a direct current voltage stabilizing power supply, the direct current voltage stabilizing power supply is respectively connected to a transmitting branch and a self-adaption dummy load branch through a current sensor, a main controller is connected with a direct current constant current power supply through a constant current power supply control unit, is connected with a current pulse generator through a pulse generator control unit, and is connected with a self-adaption current stabilizing converter through a current stabilizing converter control unit, and the current sensor is connected with the self-adaption current stabilizing converter. Under the condition that the resistance value of the dummy load is unchanged, the generator or the battery pack keeps outputting in constant power, the operation is simple and convenient, the constant pulse current amplitude is ensured, the quality of emission current pulse waveform is improved, the size of the system is reduced, the weight of an instrument is lightened, the working stability of the transmitter is increased, the service life of the alternating current generator or the battery pack and the direct current voltage stabilizing power supply is prolonged, and the device can stably and reliably work in a complex field environment in a long time.

Description

Technical field: [0001] The invention relates to an electrical instrument in geophysical prospecting, especially suitable for transmitting power at n×10 0 kW to n×10 2 Between kW, the transmitting pulse current waveform has a certain dead time, and the load impedance is an electromagnetic transmitter of 10-80Ω. Background technique: [0002] In geophysical prospecting electrical instruments, the transmitter is used to form an artificial field source and transmit an excitation signal to the detection area, and the receiver obtains underground information by detecting the response signal. For IP (InducedPolarization, induced polarization method), LOTEM (LongOffsetTransientElectromagnetic, long offset transient electromagnetic method), SOTEM (Short-offsetTransientElectromagnetic, short offset transient electromagnetic method) and GREATEM (GroundedElectricalSourceAir-groundTransientElectromagnetic, grounding electrical The source-space-ground transient electromagnetic method) ...

AI Technical Summary

Problems solved by technology

This periodic pulse current with a certain dead time loaded on the ground load forms an impact load, which makes the battery pack, generator or DC power supply frequently switch between light-load and heavy-load working states, which is harmful to the battery pack and power generation. The generator or DC power supply has a large electrical stress impact, and even causes the generator to vibrate, which eventually leads to mechanical damage or electrical performance degradation of these energy supply devices, which seriously reduces the stability and service life of the transmitter.

At the same time, this periodic pulse current loaded on the ground load will also cause changes in the physical characteristics of the ground load, making its impedance value change within a pulse period

This change is likely to cause distortion of the pulse current, which will affect the accuracy of the measurement results.

[0004] CN102053278A, CN102183792A and CN102510233A have elaborated on the transmitter device in the electrical prospecting instrument in detail. The above-mentioned transmitter device can transmit pulse current to the earth load, but it is impossible to avoid the damage caused by the pulse current to the battery pack, generator or DC power supply. Impact damage, low stability, not suitable for working under the condition of high transmission power

However, this method has two disadvantages. One is that in order to make the voltage fluctuations at both ends of the earth load not too large, it is necessary to add a large enough capacitor to the transmitter to store the energy output by the DC power supply during the dead time. The output energy is large and the voltage value is high, so the capacitor capacity is required to be large and the withstand voltage value is high, resulting in a relatively bulky device; secondly, although increasing the energy storage capacitor reduces the voltage fluctuation range, it cannot guarantee the voltage across the capacitor Fixed, the DC stabilized power supply charges the energy storage capacitor when the ground load does not consume power, causing fluctuations in the busbars at both ends of the capacitor, which distorts the current pulse on the ground load and affects the accuracy of the measurement

Images