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.
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