• Title/Summary/Keyword: Two-leg rectifier

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The Development of High-Current Power Supply System for Electrolytic Copper Foil

  • Luo, An;Ma, Fujun;Xiong, Qiaopo;He, Zhixing
    • Journal of Power Electronics
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    • v.15 no.2
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    • pp.399-410
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    • 2015
  • A 6.5 V/50 kA high-frequency switching power supply (HSPS) system composed of 10 power modules is developed to meet the requirements of copper-foil electrolysis. The power module is composed of a two-leg pulse width modulation (PWM) rectifier and a DC/DC converter. The DC/DC converter adopts two full-wave rectifiers in parallel to enhance the output. For the two-leg PWM rectifier, the ripple of the DC-link voltage is derived. A composite control method with a ripple filter is then proposed to effectively improve the performance of the rectifier. To meet the process demand of copper-foil electrolysis, the virtual impedance-based current-sharing control method with load current full feedforward is proposed for n-parallel DC/DC converters. The roles of load current feedforward and virtual impedance are analyzed, and the current-sharing control model of the HSPS system is derived. Virtual impedance is used to adjust the current-sharing impedance without changing the equivalent output impedance, which can effectively reduce current-sharing errors. Finally, simulation and experimental results verify the structure and control method.

The Power Analysis and Its Control of Two-phase Orthogonal Power Supply for the Continuous Casting

  • Ma, Fujun;Luo, An;Xiong, Qiaopo
    • Journal of Electrical Engineering and Technology
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    • v.10 no.3
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    • pp.971-982
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    • 2015
  • In order to improve the quality of the billet continuous casting, a two-phase orthogonal power supply (TPOPS) for electromagnetic stirrer is researched, which is composed of three-phase PWM rectifier and three-leg inverter. According to the power analysis of system, the ripple of dc-link voltage is analyzed and its analytical expression is derived. In order to improve the performance of electromagnetic stirring, an integrated control method with feedforward control is proposed for PWM rectifier to suppress the fluctuations of dc-link voltage and provide a stable dc source for inverter. According to the simplified equivalent model, a composite current control method is proposed for inverter. This proposed method can combine the merits of feedforward control with feedback control to effectively improve the dynamic output performance of TPOPS. Finally, a 300kVA prototype of TPOPS is developed, and the results have verified the analysis and control method.

Zero-Voltage Switching Two-Transformer Full-Bridge PWM Converter With Lossless Diode-Clamp Rectifier (새로운 무 손실 다이오드 클램프 회로를 채택한 두 개의 트랜스포머를 갖는 영 전압 스위칭 풀 브릿지 컨버터)

  • Yoon H. K.;Han S. K.;Park J. S.;Moon G. W.;Youn M. J.
    • Proceedings of the KIPE Conference
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    • 2004.07b
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    • pp.551-555
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    • 2004
  • The two-transformer full bridge (TTFB) PWM converter has two transformers which act as the output inductor as well as the main transformer, i.e. as the forward and the flyback transformer. Although the doubled leakage inductor of the TTFB makes it easier to achieve the zero-voltage switching (ZVS) of the lagging leg switch along the wide load range, it instigates a serious voltage ringing in the secondary rectifier diodes, which would require the dissipative snubber circuit, cause the serious power dissipation, and increase the voltage stress across those diodes. To overcome these problems, a, new lossless diode-clamp rectifier (LDCR) is employed as the output rectifier, which helps the voltage across rectifier diodes to be clamped on a half the output voltage $(V_o/2)$ or the output voltage $(V_o)$. Therefore, no dissipative snubber for rectifier diodes is needed and a high efficiency as well as low noise output voltage can be realized. The operations, analysis and design consideration of proposed converter are presented in this paper. To verify the validity of the proposed converter, experimental results from a 425W, 385-170Vdc prototype for the plasma display panel (PDP) sustaining power module (PSPM) are presented.

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Zero-Current Switching Two-Transformer Phase-Shifted Full-Bridge Converter using Voltage Ripple (전압 리플을 이용해 영전류 스위칭하는 두 개의 트랜스포머를 가지는 위상천이 풀-브릿지 컨버터)

  • Han, Sang-Kyoo;Moon, Gun-Woo;Youn, Myung-Joong;Yoon, Hyun-Ki
    • The Transactions of the Korean Institute of Power Electronics
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    • v.11 no.1
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    • pp.14-21
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    • 2006
  • This paper presents a Zero-Current Switching(ZCS) two-transformer phase-shifted full-bridge(TTFB) converter using voltage ripple. The proposed converter provides Zero-Voltage Switching(ZVS) of leading leg switches and ZCS of lagging leg switches using voltage ripple. Especially, circulating current is reduced by ZCS operation and there are no additional components required for the soft switching of power switches. Furthermore, in case of light load, ZVS operation of lagging leg can be achieved. The operations, analysis and design consideration of proposed converter are presented. To verify the validity of the proposed converter, experimental results for a 410W (205[V], 2[A]) prototype are presented.

Sensorless Control of PMSG for Small Wind Turbines (소형 풍력발전용 영구자석형 동기발전기의 센서리스 제어)

  • Jang, Suk-Ho;Park, Hong-Geuk;Lee, Dong-Choon;Kim, Heung-Geun
    • The Transactions of the Korean Institute of Power Electronics
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    • v.14 no.1
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    • pp.15-22
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    • 2009
  • In this paper, a sensorless control of PMSG(Permanent Magnet Synchronous Generator) for small wind turbine systems, which is based on stator flux and back-emf estimation. Also, a cost-effective AE/DC/AC converter that consists of a two-leg three-phase PWM converter and a half-bridge PWM converter is used for vector control of PMSG, which is impossible with the conventional diode-rectifier type converter. A sensorless control algorithm can eliminate pulse encoders for speed measurement, which reduces the system cost. Using PSIM simulation, the validity of the converter control performance and MPPT control of PMSG have been verified.

Phase-Shifted Full-Bridge Converter for Welding Power Supply Capable of Using 220 V, 440 V 3-Phase Grid Voltages (220V, 440V 3상 계통전압 혼용이 가능한 용접 전원장치용 위상천이 풀브리지 컨버터)

  • Yun, Duk-Hyeon;Lee, Woo-Seok;Lee, Jun-Young;Lee, Il-Oun
    • The Transactions of the Korean Institute of Power Electronics
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    • v.26 no.5
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    • pp.372-375
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    • 2021
  • A three-leg inverter-type isolated DC-DC Converter that can use 220 and 440 V grid input voltages is introduced. The secondary circuit structure of the proposed topology is center-tap, which is the same as the conventional phase-shifted full-bridge converter. However, the primary circuit structure is composed of a three-leg inverter structure and a transformer, in which two primary windings are connected in series. The proposed circuit structure has a wider input voltage range than the conventional phase-shifted full-bridge converter, and the circulating-current on the primary-side is reduced. In addition, the voltage stress at the secondary rectifier is greatly improved, and high efficiency can be achieved at a high input voltage by removing the snubber circuit added to the conventional converter. Prototype converters with input DC of 311 V, output of 622 V, and 50 V and 6 kW class specifications were designed and manufactured to verify the validity of the proposed topology; the experimental results are presented.