• Title/Summary/Keyword: Input-series and output-parallel

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Practical Series-Parallel Compensated Uninterruptible Power Supply (실용적인 직병렬 구조의 무정전전원장치)

  • Jeon, Seong-Jeup;Choe, Gyu-Hyeong
    • The Transactions of the Korean Institute of Electrical Engineers B
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    • v.48 no.6
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    • pp.322-329
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    • 1999
  • In this paper a practical series-parallel compensated UPS is suggested, which has high input power factor and sinusoidal output voltage regulation capability. Compared to conventional cascaded UPS, the size can be reduced significantly with high quality input and output waveforms. The front converter and the main inverter can be considered decoupled, hence the front converter and the main inverter can be designed independent of each other. In this paper, analysis and experimental results for an l KVA prototype are presented.

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Small-Signal Modeling and Analysis of Input Series-Output Parallel Connected Converter System for High Voltage Power Conversion Application (고 입력 전압 응용에 적합한 입력직렬-출력병렬 컨버터 시스템의 소신호 분석)

  • You, Jeong-Sik;Kim, Jung-Won;Cho, B.H.
    • Proceedings of the KIEE Conference
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    • 1999.07f
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    • pp.2712-2714
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    • 1999
  • The small signal model for input series-output parallel connected converter system employing charge control together with input capacitor voltage feedback loop is developed. From the model developed, the effect of input capacitor voltage feedback loop to the system stability and outer loop compensator design is analyzed. Theoretical results and simulation show that input capacitor voltage feedback loop has no critical effects on the system stability, so the system can be reduced to a equivalent single module for the stability analysis and outer loop compensator design.

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Research on Development of SMPS used in a Base Station for Mobile Communication (이동통신 기지국용 SMPS 개발 연구)

  • Ji Jun-Keun
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.6 no.3
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    • pp.278-284
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    • 2005
  • In this paper, phase controlled series resonant converter (PCSRC) system for power supply of communication station is suggested. PCSRC system is robust to load variations because it is POSR (parallel output series resonant) type. And it provides stable output voltage by changing phase of MOSFET switches to input voltage variations. Firstly, operation analysis about suggested series resonant converter system was carried. Then simulations using PSIM and experiments to actual system were carried to prove characteristics of suggested system.

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An analysis of phase-shifted parallel -input/series-output dual converter for high-power step-up applications (대용량 승압형 위상천이 병렬입력/직렬출력 듀얼 컨버터의 분석)

  • Kang Jeong-il;Roh Chung-Wook;Moon Gun-Woo;Youn Myung-Joong
    • Proceedings of the KIPE Conference
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    • 2001.07a
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    • pp.189-192
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    • 2001
  • A new phase-shifted parallel-input/series-output dual converter for high-power step-up applications has been proposed. It features a high efficiency due to the low switch turn-off voltage, low device stresses, low ripple contents, and a fast control-to-output dynamics compared to its PWM counterpart. To confirm the validity of the proposed converter, experimental results from an 800W, 350Vdc prototype are presented.

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Interleaved Forward Converter for High Input Voltage Application with Common Active-Clamp Circuit

  • Park, Ki-Bum;Kim, Chong-Eun;Moon, Gun-Woo;Youn, Myung-Joong
    • Proceedings of the KIPE Conference
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    • 2008.06a
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    • pp.400-402
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    • 2008
  • A new interleaved forward converter, adopting series-input parallel-output structure with a common transformer reset circuit, is proposed in this paper. Series-input structure distributes the voltage stress on switches, which makes it suitable for high input voltage application. Paralleling output stage with an interleaving technique enables the circuit handle large output current and reduces filter size. In addition, since two forward converters share one active-clamp circuit for the transformer reset, its primary structure is simplified. All these features make the proposed converter promising for high input voltage applications with high efficiency and simple structure.

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Two-Phase Hybrid Forward Convertor with Series-Parallel Auto-Regulated Transformer Windings and a Common Output Inductor

  • Wu, Xinke;Chen, Hui
    • Journal of Power Electronics
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    • v.13 no.5
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    • pp.757-765
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    • 2013
  • For conventional interleaved two-phase forward converters with a common output inductor, the maximum duty cycle is 0.5, which limits the voltage range and increases the difficulty of the transformer's optimization. A new two-phase hybrid forward converter with series-parallel auto-regulated transformer windings is presented in this paper. With interleaved control signals for the two phases, the secondary windings of the transformers can work in series when the duty cycle is larger than 0.5, and they can work in parallel when duty cycle is lower than 0.5. Therefore, the maximum duty cycle is extended and the turns ratio of the transformer can be optimized. Duty cycle dependent auto-regulated windings result in the steady states of the converter being different in different duty cycle ranges (D>0.5 and D<0.5). Fortunately, the steady state gains of the proposed hybrid converter are identical at different duty cycle ranges, which means a stepless shift between two states. A prototype is built to verify the theoretical analysis. A conventional control loop is compatible for the whole input voltage range and load range thanks to the stepless shifting between the different duty cycle ranges.

Resonant Converter System for Control Power Supply (제어용 전원으로 사용가능한 공진형 컨버터 시스템)

  • Ji Jun-Keun;Lim Young-Ha
    • Proceedings of the KIPE Conference
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    • 2003.07a
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    • pp.69-72
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    • 2003
  • In this paper new control strategy of series resonant converter system for control power supply is suggested. Frequency controlled series resonant converter system is robust to load variations because it is POSR(parallel output series resonant) type. And it provides stable output voltage by changing switching frequency to input voltage variations. Firstly, operation analysis about suggested series resonant converter system was carried. Then simulations using ACSL(Advanced Continuous Simulation Language) and experiments to actual system were carried to prove characteristics of suggested system.

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Implementation of a ZVS Three-Level Converter with Series-Connected Transformers

  • Lin, Bor-Ren
    • Journal of Power Electronics
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    • v.13 no.2
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    • pp.177-185
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    • 2013
  • This paper studies a soft switching DC/DC converter to achieve zero voltage switching (ZVS) for all switches under a wide range of load condition and input voltage. Two three-level PWM circuits with the same power switches are adopted to reduce the voltage stress of MOSFETs at $V_{in}/2$ and achieve load current sharing. Thus, the current stress and power rating of power semiconductors at the secondary side are reduced. The series-connected transformers are adopted in each three-level circuit. Each transformer can be operated as an inductor to smooth the output current or a transformer to achieve the electric isolation and power transfer from the input side to the output side. Therefore, no output inductor is needed at the secondary side. Two center-tapped rectifiers connected in parallel are used at the secondary side to achieve load current sharing. Due to the resonant behavior by the resonant inductance and resonant capacitance at the transition interval, all switches are turned on at ZVS. Experiments based on a 1kW prototype are provided to verify the performance of proposed converter.

Analysis of an Interleaved Resonant Converter for High Voltage and High Current Applications

  • Lin, Bor-Ren;Chen, Chih-Chieh
    • Journal of Electrical Engineering and Technology
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    • v.9 no.5
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    • pp.1632-1642
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    • 2014
  • This paper presents an interleaved resonant converter to reduce the voltage stress of power MOSFETs and achieve high circuit efficiency. Two half-bridge converters are connected in series at high voltage side to limit MOSFETs at $V_{in}/2$ voltage stress. Flying capacitor is used between two series half-bridge converters to balance two input capacitor voltages in each switching cycle. Variable switching frequency scheme is used to control the output voltage. The resonant circuit is operated at the inductive load. Thus, the input current of the resonant circuit is lagging to the fundamental input voltage. Power MOSFETs can be turn on under zero voltage switching. Two resonant circuits are connected in parallel to reduce the current stress of transformer windings and rectifier diodes at low voltage side. Interleaved pulse-width modulation is adopted to decrease the output ripple current. Finally, experiments are presented to demonstrate the performance of the proposed converter.

A Single-Phase Quasi Z-Source AC-AC Converter with a Series Connection of the Output Terminals (출력이 직렬 결합된 단상 Quasi Z-소스 AC-AC 컨버터)

  • Oum, Jun-Hyun;Jung, Young-Gook;Lim, Young-Cheol;Choi, Joon-Ho
    • The Transactions of the Korean Institute of Power Electronics
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    • v.16 no.5
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    • pp.415-429
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    • 2011
  • In this study, a single-phase quasi Z-source AC-AC converters with a series connection of the output terminals is proposed. The proposed system has configuration that the input terminals of two quasi Z-source AC-AC converters are connected in parallel and its output terminals are connected in series. The out of phase mode and in phase mode of the proposed system are presented. To verify the validity of the proposed converter, a DSP controlled hardware was made and PSIM simulation was executed. As a result, controlling the duty ratio of the converter, the desired buck-boost output voltages could be generated. For each modes, as compared with the single converter operation, the proposed converter could enhance the efficiency and input power factor according to different loads. Also, in case of the out of phase mode under the constant load, the efficiency and input power factor of the proposed system are increased 10[%], 35[%] respectively in compared with the single converter. And, the output voltage is constantly controlled in dynamic state in case while the load is suddenly changed.