Voltage Balancing Control based on Gate Signal Delay in Series Connection of SiC-MOSFET

Shingu, Katsuya; Wãda, Keiji

doi:10.1541/ieejias.138.864

Cited by 3 publications

(2 citation statements)

References 9 publications

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“…Therefore, to address this issue, we employed series-connected power semiconductors without the need for large magnetic materials. Currently, research is underway on series connection and switching beyond the rated voltage of a single discrete semiconductor [36][37][38][39][40][41][42][43][44][45][46][47][48][49]. One of the specific challenges with the series connection of semiconductors is the occurrence of voltage differences between them, which can lead to voltages surpassing the rating of a single semiconductor, resulting in its destruction.…”

Section: Introductionmentioning

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: Introductionmentioning

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

“…In order to overcome this problem, several techniques have been studied, such as using RC snubbers (7) and gate balance cores (8) , digital controls (9) . However, RC snubbers and gate balance cores have the problem of increasing switching losses, digital controls have the response delay time problem due to the processing speed in the digital control technique.…”

Section: Introductionmentioning

confidence: 99%

Bidirectional Converter with Multi-stage FETs Featuring Voltage Balance Control Function Using Variable Capacitors

2021

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This paper presents a bidirectional converter with multi-stage FETs featuring voltage balance control function using variable capacitors. The proposed converter is constructed using low-voltage Si-FETs in a series connection, and it improves the voltage balance between the drain-source voltages of the series connected FETs in the OFF period. Using the converter figure of merit (FOM), which can estimate the converter losses from the specifications of the FETs, the effectiveness of the proposed converter is compared to that of a converter using SiC-FETs. The factors of the voltage unbalance are analytically clarified using the equivalent circuit. The principle of voltage balance control function using the variable capacitor is discussed. The experimental results show that the proposed converter can achieve a maximum power conversion efficiency of 99.2%.

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Improvement Method of Voltage Sharing Performance for Series-Connected GaN Devices based on an Active Surge Absorber Circuit

Itogawa,

Harada,

Urakabe

et al. 2023

2023 25th European Conference on Power Electronics and Applications (EPE'23 ECCE Europe)

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Voltage Balancing Control based on Gate Signal Delay in Series Connection of SiC-MOSFET

Cited by 3 publications

References 9 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

Bidirectional Converter with Multi-stage FETs Featuring Voltage Balance Control Function Using Variable Capacitors

Improvement Method of Voltage Sharing Performance for Series-Connected GaN Devices based on an Active Surge Absorber Circuit

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