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Bipolar square-wave current source for transient electromagnetic systems based on constant shutdown time.

Shilong Wang1, Changchun Yin2, Jun Lin1

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This summary is machine-generated.

A new method precisely controls current shutdown in transient electromagnetic systems. This technique ensures synchronized current termination in inductive loads, improving cooperative work between borehole and ground transmitting systems.

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Area of Science:

  • Electrical Engineering
  • Geophysics
  • Electromagnetism

Background:

  • Cooperative work of multiple magnetic transmitting sources is advancing transient electromagnetic (TEM) systems.
  • Synchronized shutdown of bipolar current waves in inductive loads is crucial for TEM system efficiency.
  • Traditional constant clamping voltage techniques struggle with synchronizing currents of varying peak values.

Purpose of the Study:

  • To introduce a novel current shutdown control method for TEM systems.
  • To enable synchronized current termination in inductive loads with different peak values.
  • To enhance the cooperative operation of borehole and ground transmitting systems.

Main Methods:

  • Developed a new control method based on constant shutdown time, utilizing current rising time to regulate shutdown duration.
  • Employed a low voltage power source to manage peak current.
  • Established a relationship between rising time and shutdown time, considering circuit energy loss, high-voltage capacitor bypass resistance, and passive snubber circuit capacitance.
  • Proposed a testing method for shutdown time using low voltage, high voltage, and peak current, accounting for non-ideal switch characteristics.

Main Results:

  • Demonstrated that adjusting current rising time precisely controls clamp voltage.
  • Confirmed that a fixed rising time results in an unchanged shutdown time.
  • Calculated the error for shutdown time deduced from energy consumption to be less than 6%.

Conclusions:

  • The proposed constant shutdown time control method offers precise management of current shutdown in TEM systems.
  • This method effectively synchronizes current termination, even with varying peak currents.
  • The technique is applicable to cooperative work in borehole and ground transmitting systems, advancing TEM technology.