Underground energy converter exciting circuit and work method of underground energy converter exciting circuit

Abstract

The embodiment of the invention provides an underground energy converter exciting circuit and a work method of the underground energy converter exciting circuit. The circuit comprises a pulse transformer, a VMOS (V groove metal oxide semiconductor) array, an excitation driving circuit and a logic controller, wherein the logic controller is used for generating control logic signals, the excitation driving circuit is used for generating excitation control signals used for controlling the order on-off state of the VMOS array according to the control logic signals, and the VMOS array is used for controlling the high-voltage isolation of the non-excitation side and the conduction and current continuation of the primary coil excitation side in the pulse transformer through the order on-off operation under the control of the excitation control signals, so positive or negative excitation pulses are generated at the output level of the pulse transformer and are then sent to the energy converter. After the circuit is used, the positive and negative power excitation of a plurality of sound wave bending vibrator energy converters can be realized, the monopole excitation, the orthogonal dipole excitation and the quadripole excitation can be realized in the petroleum well logging construction, the number of the energy converters is reduced, the length of instruments is shortened, and the work reliability of the instruments is improved.

Description

technical field [0001] The invention belongs to the technical field of applied geophysics, and in particular relates to an excitation circuit for a downhole transducer and a working method thereof. Background technique [0002] Multipole acoustic logging tools can measure the shear wave velocity of soft formations and evaluate formation anisotropy, so they have important applications in complex oil and gas evaluation. The structure of the conventional excitation circuit is simple, but it can only realize the one-way excitation of the acoustic transducer, which requires more transducers and excitation circuit channels to realize multipole acoustic excitation, which increases the number of multipole acoustic logging. The length of the instrument reduces its reliability in high temperature and high pressure environment. [0003] Existing acoustic wave transducers are generally excited by transformers, which can achieve good impedance matching and obtain high-power excitation p...

AI Technical Summary

Problems solved by technology

The existing center-tapped commutation transformer has technical defects in realizing commutation excitation, that is, when one side of the center-tapped commutation transformer is used to excite, high voltage is generated on the other side, and the high voltage forms a loop with the primary of the transformer through the freewheeling diode , consumption of excitation energy, high-voltage pulses cannot be obtained, so forward and reverse excitation cannot be realized

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