Bipolar Steep Pulse Current Source for Highly Inductive Load

Zhu, Xun; Su, Xin; Tai, Heng–Ming; Fu, Zhihong; Yu, Cigong

doi:10.1109/tpel.2015.2503383

Cited by 22 publications

(16 citation statements)

References 23 publications

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“…Therefore, the shape and distribution of UXO targets can be obtained according to the secondary voltage sampled within a later time window. Owing to the fast turn-off of pulse current, the time window for sampling of effective secondary voltage can be advanced so that more information of shallow objects will be obtained [20]. It is found that UXO detection by small loop TEM method is effective compared to magnetic method.…”

Section: Tem Survey Principlementioning

confidence: 99%

Transient Electromagnetic Voltage Imaging of Dense UXO-Like Targets Based on Improved Mathematical Morphology

et al. 2020

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Unexploded ordnance (UXO) survey is the foremost task of clearance project. Transient electromagnetic method (TEM) is proved effective for UXO survey. However, it is still difficult for TEM to detect small-size, ultra-shallow and dense UXO targets because the large-size devices and inversion methods for large-scale applications are usually ineffective. In the work, in order to avoid the complex inversion of apparent resistivity, the voltages acquired by our specified small-loop TEM system are used to depict a voltage distribution profile, which is then processed with an improved imaging algorithm. Several major influences on the secondary voltage image are discussed during UXO survey, including emitting coil size, target attitude, basin effect and shell thickness. Furthermore, an improved watershed imaging algorithm is proposed to obtain the best threshold marking and automatically realize the dense target discrimination. Oversegmentation resulting from burrs, noises, and scraps is reduced through background marking. And also under-segmentation is avoided during foreground marking through adaptive search of saddle point. The algorithm has been verified effective using simulation data and experiment data of UXO-like targets. INDEX TERMS Transient electromagnetic method, unexploded ordnance, image segmentation, watershed transform, adaptive saddle point search.

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Section: Tem Survey Principlementioning

confidence: 99%

Transient Electromagnetic Voltage Imaging of Dense UXO-Like Targets Based on Improved Mathematical Morphology

et al. 2020

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“…Literature [5] pointed out that using voltage stabilizing clamp fast turn-off transmitting circuit, as shown in Figure 1, can adjust the emission current falling edge. In Figure 1, the dotted line frame 1 is clamp circuit, and the dotted line frame 2 is adjustable constant pressure source.…”

Section: Voltage Stabilizing Clamp Fast Turn-off Principlementioning

confidence: 99%

“…In practice, however, emission current falling edge is exponentially because of the load is an inductor, which has self-inductance and parasitic capacitance. Therefore, the actual response is second order underdamped response, which can lead to overshoot and oscillation phenomenon of the emission current during the late period of the turn-off [5]. It will affect early signal of secondary magnetic field seriously.…”

Section: Introductionmentioning

confidence: 99%

“…It will affect early signal of secondary magnetic field seriously. One method widely used to accelerate the emission current decrease and reduce oscillation, is to use a damped resistor in parallel with the coil to ensure system to be critical damping response, and the resistor value varies according to the coil parameters, and cooperating with the voltage stabilizing clamp technique for increasing the emission current falling edge slope [5].…”

Section: Introductionmentioning

confidence: 99%

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Research on Precise Damping Matching for Transient Electromagnetic Transmitter

Bao¹,

Zhang²,

Li³

et al. 2018

dtcse

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Abstract.A method is introduced to precisely match the damping resistor of different transmitting coils via the output port of the transient electromagnetic transmitter. Theoretical analysis of the distributed parameter model of the transmitting coil are described. Equations calculating the critical damping resistor are derived from the self-inductance, internal resistance, and the distributed capacitance of the transmitting coil, accordingly. Extensive experiments demonstrate that the proposed method can rectify the overshoot and oscillation phenomenon of the emission current during the late period of the turn-off.

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“…In [7], the solid-state DC/DC boost front-end and h-bridge output are used to achieve the purpose of rapid current rise. In order to realize the output current steep pulse, literatures [8] and [9] respectively put forward the method of using high-voltage dc power supply and increasing boost charging circuit to charge capacitor during pulse current commutation. In order to improve the quality stability of transmitting current waveform, a method for suppressing the ripple current of the flat-top section of the emission current by introducing a passive bypass circuit in [10], and reference [11] proposed a high precision mixed-signal (analog and digital) plan for output current stabilization.…”

Section: Introductionmentioning

confidence: 99%

A Wide-Frequency Constant-Amplitude Transmitting Circuit for Frequency Domain Electromagnetic Detection Transmitter

Wang

Yao

et al. 2019

Electronics

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In this paper, a novel AC magnetic transmitter current source circuit is proposed for application of frequency domain electromagnetic method (FEM) prospecting. The proposed current source circuit is capable of generating high frequency and high constant amplitude currents, which are key technical problems for FEM. It is suitable for very wide frequencies. The main circuit of the proposed current source consists of a rising-edge enhancing unit, a constant current control unit, and a high voltage clamping unit. Large constant clamping voltage is applied during the rising edge and the falling edge of the alternating square current to obtain a high frequency and high linearity current source. On the current flat stage, the constant current unit provides the energy to the load to ensure the constant amplitude of the output current. Detailed operations of the proposed magnetic current source are given. Simulation and experimental results demonstrate that the proposed circuit achieves short reversal time, the linearity of the rising/falling edge, constant amplitude and low power loss. These are the desired characteristics of the ac square current source probing transmitter for the magnetic FEM applications.

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Bipolar Steep Pulse Current Source for Highly Inductive Load

Cited by 22 publications

References 23 publications

Transient Electromagnetic Voltage Imaging of Dense UXO-Like Targets Based on Improved Mathematical Morphology

Transient Electromagnetic Voltage Imaging of Dense UXO-Like Targets Based on Improved Mathematical Morphology

Research on Precise Damping Matching for Transient Electromagnetic Transmitter

A Wide-Frequency Constant-Amplitude Transmitting Circuit for Frequency Domain Electromagnetic Detection Transmitter

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