Feasibility Studies of EMTP Simulation for the Design of the Pulsed-Power Generator Using MPC and BPFN for Water Treatments

Choi, Jaehyuk; Yamaguchi, T.; Yamamoto, Kunihiro; Namihira, T.; Sakugawa, Takashi; Katsuki, S.; Akiyama, H.

doi:10.1109/tps.2006.883384

Cited by 46 publications

(4 citation statements)

References 8 publications

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“…In the current circuit, capacitors were charged through charging resistors, meaning that a charging current always flows even during the semiconductor's on-time. Previously, we controlled the charging source using a gate controller and electrically disconnected the charging side, thereby increasing the input capacity of the power source [60][61][62]. This control allows us to increase the input capacity of the power source proposed in this study.…”

Section: Discussionmentioning

confidence: 99%

The Development of a Compact Pulsed Power Supply with Semiconductor Series Connection

Zaizen,

Asami,

Furukawa

et al. 2023

Electronics

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In this study, high-voltage switching was performed by connecting semiconductors in series. By employing Snubber circuits and voltage divider resistors for each semiconductor, the destruction of the semiconductors was prevented. Additionally, a pulse transformer was installed between the function generator and the photocoupler to isolate the gate circuit, preventing electrical discharges in the circuit and enabling operation at an output voltage of 10 kV and an operating frequency of 200 Hz. The temperature of the semiconductors increased with the increase in operating frequency, which was counteracted by connecting charging resistors and capacitors to limit the current to the semiconductors. As a result, operation at 430 Hz became possible. Furthermore, a saturable inductor (SI) was connected to enable continuous operation. The SI delays the rise of the current and creates a phase difference, thereby reducing the power consumption of the conductor and mitigating the temperature rise, enabling continuous operation at 300 Hz. Moreover, by increasing the number of semiconductor series stages to six, an output voltage of 20 kV was confirmed in tests. By using two semiconductor series circuits, the pulsed power supply that can be changed to any pulse width was also created. As a result, output voltages with arbitrary pulse widths from 5 μs to 30 μs were confirmed.

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Section: Discussionmentioning

confidence: 99%

The Development of a Compact Pulsed Power Supply with Semiconductor Series Connection

Zaizen,

Asami,

Furukawa

et al. 2023

Electronics

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show abstract

“…High voltage pulsed power technology [1,2,3,4] has been widely used in industrial applications and military defense applications, such as food processing, medical treatment, environment protection and others [5,6,7,8]. Over the past decades, solid-state power devices [9,10,11] have become the preferred choice of pulse switch in pulse modulators due to their high efficiency, long lifetime, light weight and low cost [12].…”

Section: Introductionmentioning

confidence: 99%

Snapback-free base resistance controlled thyristor with floating N-region

Song

Han

et al. 2019

IEICE Electron. Express

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An analysis model of snapback voltage for the base resistance controlled thyristor (BRT) is developed in this paper. It's shown that, improving hole current flowing into P-base region is an important way to suppress snapback phenomenon during forward conducting state. Thus, a new BRT with a floating N-region in N-drift layer is proposed. In this new structure, the floating N-region introduces a hole potential barrier in parasitic PNP to prevent holes from being swept into cathode. Then, almost all of hole current flow into P-base to trigger latch-up effect and the parastic PNP transistor is greatly suppressed. Thus, snapback is significantly suppressed. Numerical simulation results show that, when doping level and length of floating N-region are 8.0 × 10 15 cm −3 and 5.0 µm, snapback-free can be realized, and pulse discharge performance and turn on characteristics are greatly improved meanwhile the high blocking capability is maintained.

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“…The dc and ac characteristics of magnetic materials have been well known and easy to obtain from manufacturers. As the use of magnetic cores has become popular in pulsedpower applications, there have been several studies of the pulse magnetic characteristics that are critical for a multi-stage MPC [16][17][18][19][20]. However, there are still some necessities for the users of the magnetic cores to measure the pulse characteristics for more efficient MPC design.…”

Section: Introductionmentioning

confidence: 99%

Simulation of 3-Staged MPC Using Custom Characteristics of Magnetic Cores

Choi

Namihira

Sakugawa

et al. 2007

IEEE Trans. Dielect. Electr. Insul.

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A low inductance circuit has been fabricated in order to obtain shorter time to saturation during core unsaturation and current pulses with shorter widths during core saturation. B-H curves have been derived from the measured voltage and current waveforms. Characteristics of the magnetic core for pulsed-power generators have been investigated and the Electromagnetic Transient Program (EMTP) simulation has been carried out in order to determine the effects of leakage current on the energy efficiency of a 3-staged magnetic pulse compressor (MPC). As results, the derived B-H curves show the following characteristics: a high ratio of unsaturated to saturated permeability (µ un /µ sat ), a maximum flux swing of about 2.55 T, a high ratio of remanent flux density to saturation magnetic flux density (B r /B s ) and low core loss. And, it is found that µ un increases with time to saturation and that µ sat is strongly influenced by the stray inductances of the core. By applying custom characteristics to each stage in EMTP simulation, more practical energy transfer in MPC is obtained.

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Feasibility Studies of EMTP Simulation for the Design of the Pulsed-Power Generator Using MPC and BPFN for Water Treatments

Cited by 46 publications

References 8 publications

The Development of a Compact Pulsed Power Supply with Semiconductor Series Connection

The Development of a Compact Pulsed Power Supply with Semiconductor Series Connection

Snapback-free base resistance controlled thyristor with floating N-region

Simulation of 3-Staged MPC Using Custom Characteristics of Magnetic Cores

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