An 8kW LLC resonant converter in plasma power supply based on SiC power devices for efficiency improvement

Wang, Zhenmin; Fan, Weijun; Xie, Fangxiang; Ye, Chunxian

doi:10.1108/cw-07-2018-0058

Cited by 8 publications

(6 citation statements)

References 19 publications

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“…This control scheme can achieve good adaptability in nonlinear load, but the dynamic performance of voltage loop is not obviously improved. [8] proposed LLC resonant converter using silicon carbide (SiC MOSFET) power device. This topology can effectively reduce the output current ripple by increasing the control frequency in low power equipment.…”

Section: Introductionmentioning

confidence: 99%

A Novel MCIs Dual-Bridge for Plasma Cutting Power Supply With Arc Current Feedforward Compensated Phase-Shift Control

et al. 2022

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This paper presents a novel multi-stage coupled inductors (MCIs) dual-bridge converter using phase-shifted control strategy with arc current feedforward compensated, aiming to meet the demands of low frequency arc ignition, arc transfer process and multi-mode cutting in plasma cutting power supply. Compared to the conventional half-bridge and full-bridge converters, the proposed (MCIs) dual-bridge converter can suppress the output current ripple greatly, which benefits from inductance coupling and double control frequency. Then, the mathematical model of multi-stage coupled dual-bridge is built, and the phaseshifted control method is studied. Combined with the advantages of (MCIs) dual-bridge converter, the proposed control algorithm with arc current feedforward can solve the arc problems of ignition failure via plasma arc current compensation and pneumatic circuit compensation, which caused by serious current fluctuation during sudden change of air pressure and arc transform frequently in cutting process. To verify the feasibility of the proposed multi-stage coupled dual-bridge converter and control scheme, a 20kW experimental prototype for plasma cutting power supply has been built. The experimental results show that the proposed topology and control scheme help to improve the success rate of arc ignition, reduce the probability of cutting arc breaking, make the power supply more stable and the cutting effect much better.INDEX TERMS Plasma cutting power supply, Coupled multi-stage dual-bridge, Arc current feedforward, Phase-shifted control strategy.

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Section: Introductionmentioning

confidence: 99%

A Novel MCIs Dual-Bridge for Plasma Cutting Power Supply With Arc Current Feedforward Compensated Phase-Shift Control

et al. 2022

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“…Additionally, the reported converter possessed an inherent short-circuit current limiting capability, which minimizes the control requirement and increases the ruggedness. Wang et al (2019) presented an 8 kW LLC resonant converter particularly designed for the plasma power supply based on SiC power devices, which was lighter in weight, more compact and more efficient than previous designs. Wu et al (2021) proposed a direct-current gas metal arc welding (GMAW) power supply using a parallel full-bridge LLC resonant converter, which realized stable and efficient direct-current GMAW near the theoretical optimal operating point, with 210 A output current.…”

Section: Introductionmentioning

confidence: 99%

Novel and simplified implementation of digital high-power pulsed MIG welding power supply with LLC resonant converter

Huang²,

Chen³

et al. 2022

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Purpose This paper aims to overcome the limitations of low efficiency, low power density and strong electromagnetic interference (EMI) of the existing pulsed melt inert gas (MIG) welding power supply. So a novel and simplified implementation of digital high-power pulsed MIG welding power supply with LLC resonant converter is proposed in this work. Design/methodology/approach A simple parallel full-bridge LLC resonant converter structure is used to design the digital power supply with high welding current, low arc voltage, high open-circuit voltage and a wide range of arc loads, by effectively exploiting the variable load and high-power applications of LLC resonant converter. Findings The efficiency of each converter can reach up to 92.3%, under the rated operating condition. Notably, with proposed scheme, a short-circuit current mutation of 300 A can stabilize at 60 A within 8 ms. Furthermore, the pulsed MIG welding test shows that a stable welding process with 280 A peak current can be realized and a well-formed weld bead can be obtained, thereby verifying the feasibility of LLC resonant converter for pulsed MIG welding power supply. Originality/value The high efficiency, high power density and weak EMI of LLC resonant converter are conducive to the further optimization of pulsed MIG welding power supply. Consequently, a high performance welding power supply is implemented by taking adequate advantages of LLC resonant converter, which can provide equipment support for exploring better pulsed MIG welding processes.

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“…Rymarski et al (2020) present the concept of measuring the Bode plots of the control transfer function to get the serial equivalent resistance and to calculate the power conversion losses of an experimental model and discusses the accuracy of the results. Wang et al (2019) present an 8 kW LLC resonant converter designed for plasma power supply with higher efficiency and lighter structure. The experimental results show that the topology, switching loss, rectifier loss, trans-former loss and drive circuit of the full-bridge LLC silicon carbide (SiC) plasma power supply can be optimized.…”

Section: Introductionmentioning

confidence: 99%

“…Moreover, it has physical and chemical processes with special light, heat, sound and electricity. Compared with other low temperature plasma generation methods, DBD is more suitable for large-scale industrial production and has broad application prospects in many fields, such as tail gas treatment (Wang and Sun, 2016; Wang et al , 2010; Zhang et al , 2016a, 2016b), waste water treatment (Wang et al , 2015, 2019), air purification (Shimizu et al , 2012), sterilization and disinfection (Chen et al , 2012; Huang et al , 2011), material surface modification (Chen et al , 2006), film deposition (Ananth and Mok, 2016; Mori et al , 2015) and so on. These applications and fields have attracted more and more attention to many researchers.…”

Section: Introductionmentioning

confidence: 99%

A half-bridge IGBT drive and protection circuit in dielectric barrier discharge power supply

Wang

Lü

Chen

et al. 2021

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Purpose This paper aims to improve the general circuit of driving and protection based on insulated gate bipolar transistor (IGBT) in dielectric barrier discharge power supply by designing a novel half-bridge inverter circuit with discrete components. Design/methodology/approach With one SG3524 chip, the structure based on discrete components is used to design the IGBT drive circuit. The driving waveform is isolated and sent out by photo-coupler 6N137. The protection circuit is realized by Hall sensor directly detecting the main circuit current, supplemented by a few components, including diodes, resistors, capacitors and triodes. It improves the reliability of the protection circuit. Findings In the driving circuit, the phase difference of signals from two channels are 180°. Moreover, when the duty cycle is set at 40%, it can ensure sufficient pulse width modulation response time. In the protection circuit, when over-current occurs, an intermittent output signal is automatically sent out. Furthermore, the over-current response time can be controlled independently. The peak voltage can be adjusted continuously from 0 to 30 kV with its frequency from 8 to 25 kHz and the power output up to 150 W. Originality/value The novel circuit of driving and protection makes not only its structure simpler and easier to be realized but also key parameters, such as frequency, the duty cycle and the driving voltage, continuously adjustable. Moreover, the power supply is suitable for other discharges such as corona discharge and jet discharge.

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An 8kW LLC resonant converter in plasma power supply based on SiC power devices for efficiency improvement

Cited by 8 publications

References 19 publications

A Novel MCIs Dual-Bridge for Plasma Cutting Power Supply With Arc Current Feedforward Compensated Phase-Shift Control

A Novel MCIs Dual-Bridge for Plasma Cutting Power Supply With Arc Current Feedforward Compensated Phase-Shift Control

Novel and simplified implementation of digital high-power pulsed MIG welding power supply with LLC resonant converter

A half-bridge IGBT drive and protection circuit in dielectric barrier discharge power supply

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