Method and device for high-speed off of energy-feedback constant-voltage clamp

Abstract

The invention relates to a device for the high-speed off of an energy-feedback constant-voltage clamp. The device comprises a constant voltage source circuit, a clamp circuit and an H bridge inverter circuit, wherein the constant voltage source circuit provides stable voltage during the falling edge of emission current; the clamp circuit provides a current pathway for a transmitting antenna during the falling edge of the emission current, and energy in the transmitting antenna is released to the constant voltage source circuit, so that the voltage on the transmitting antenna reaches a voltage value of a constant voltage source to realize the voltage clamp purpose. The invention further provides a method for the high-speed off of a transient electromagnetic transmitter and the energy-feedback constant-voltage clamp. The device provided by the invention can realize high-speed and linear off during the falling edge of the current, is small in tail oscillation, effectively restrains current overshoot, feeds back the energy stored in the transmitting antenna during the falling edge to the constant-voltage source and releases during the rising edge of a next emission current pulse, so that the current rapidly rises, the energy loss is reduced, moreover, the working efficiency of the transmitter is improved.

Description

technical field [0001] The invention relates to the field of geophysical exploration, and more particularly, to a high-speed shutdown method and device for energy-feeding constant-voltage clamping. Background technique [0002] Transient Electromagnetic Method (TEM for short) is a geological structure detection method widely used in geophysical science. Magnetic field, during the interval of a pulsed magnetic field, measure the induced electromagnetic field (secondary field) produced by the underground medium over time, and then obtain the information of the underground material body through the study of the secondary field. In recent years, based on the application of mineral resources exploration and energy strategy needs, the transient electromagnetic method has been developed rapidly. [0003] The high-speed shutdown technology of the falling edge of the emission current is the key to the transient electromagnetic transmitter. For shallow underground detection, the tur...

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Problems solved by technology

[0006] However, the above prior art has the following technical defects: (1) traditional processing methods such as RCD and RC can provide a more effective discharge circuit for the energy in the transmitting antenna, and protect the electronic switch from being damaged by the self-inductance voltage generated by the transmitting antenna , but the current drop speed of this method is slow, and the early linearity is poor, which cannot well meet the application requirements of transient electromagnetic systems

(2) The TVS method can realize the short turn-off delay of the falling edge current, but TVS cannot withstand repetitive instantaneous pulses for a long time, and the accumulation of absorbed energy will burn it out, so it can only be applied to low-power transmitting systems; in addition, TVS devices There is a large junction capacitance, which will cause the emission current to oscillate

(3) The Zener Zener diode method can achieve a rapid drop in the emission current, but there are overshoots and oscillations at the tail of the emission current drop, and with the accumulation of use time, the Zener Zener diode absorbs energy and heats up, and the voltage at both ends will decrease. As the temperature changes, the shape of the falling edge of the emission current changes, and the quality of the emission current is not high, which directly affects the detection effect of the system

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