Constant Voltage-clamping Bipolar Pulse Current Source for Transient Electromagnetic System

Abstract

This article proposes a bipolar pulse current source for the transient electromagnetic system. This current source consists of a full-bridge converter circuit, a constant voltage-clamping circuit, and a damping-snubber circuit. Bipolar pulses are generated by the full-bridge converter circuit. During the rising edge of the pulse current, the high voltage generated by the constant voltage-clamping circuit is added to the load, which will enhance the rising speed of the pulse current and help the current quickly stabilize. Similarly, for the falling edge, the constant voltage acts on the load, brings out a linear falling edge, and efficiently shortens the turn-off time. The damping snubber circuit is then used to eliminate the ringing happening in the current-reduced-to-zero vicinity. Its operation principles are described, and calculations of the main parameters are also provided. Simulation and experimental results show that the current source has a fast rising edge, a highly linear falling edge, and a short turn-off time, which helps to enhance the transmitting frequency of the current source and the efficiency of the transient electromagnetic system.

Frequency‐domain analysis for pulse current sources in transient electromagnetic method

“…The geometry of TEM waveforms, including the current pulse width, edge steepness, edge linearity, and the current magnitude, has become the focus of research studies for these years (Fitterman and Anderson ; Fu, Zhou and Tai ; Feng, Wang and Lian ; Dennis and Cull ; Zhao et al . ).…”

“…Zhao et al . () made an effort to steepen the rising edge of the transmitting current. We have also carried out the design and experiments to provide a current of 20 A for a transmitting coil of 2.1 mH and obtained a rise time less than 200 s, which will help promote the field application of the results in this paper in the near future.…”

Effective Suppression of Conducted Electro Magnetic Interference in DC-DC Boost Converter Using Field Programmable Gate Array Based Chaotic Pulse Width Modulation Switching

“…When DC-DC converters are used, it releases electromagnetic emissions at a very high switching frequency and thus forms main sources of EMI. EMI is any man-made or natural electromagnetic disturbance or signal that causes an unacceptable response or malfunctioning of any electrical or electronic device or system [5][6][7]. Although such techniques as EMI filters and shielding are available to mitigate the EMI, they work as a remedy.…”

Novel Pulse-width Modulation Strategy to Minimize the Switching Losses of Z-Source Inverters

“…The switching power loss reduction in inverters is one of the most important aspects of PWM strategies, and hence, much research has been reported to decrease the switching power losses [9][10][11][12][13][14][15]. However, there has been no thorough research reported for the ZSI switching power loss reduction.…”