• 제목/요약/키워드: Input current doubler

검색결과 35건 처리시간 0.036초

High Step-up Active-Clamp Converter with an Input Current Doubler and a Symmetrical Switched-Capacitor Circuit

  • He, Liangzong;Zeng, Tao;Li, Tong;Liao, Yuxian;Zhou, Wei
    • Journal of Power Electronics
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    • 제15권3호
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    • pp.587-601
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    • 2015
  • A high step-up dc-dc converter is proposed for photovoltaic power systems in this paper. The proposed converter consists of an input current doubler, a symmetrical switched-capacitor doubler and an active-clamp circuit. The input current doubler minimizes the input current ripple. The symmetrical switched-capacitor doubler is composed of two symmetrical quasi-resonant switched-capacitor circuits, which share the leakage inductance of the transformer as a resonant inductor. The rectifier diodes (switched-capacitor circuit) are turned off at the zero current switching (ZCS) condition, so that the reverse-recovery problem of the diodes is removed. In addition, the symmetrical structure results in an output voltage ripple reduction because the voltage ripples of the charge/pump capacitors cancel each other out. Meanwhile, the voltage stress of the rectifier diodes is clamped at half of the output voltage. In addition, the active-clamp circuit clamps the voltage surges of the switches and recycles the energy of the transformer leakage inductance. Furthermore, pulse-width modulation plus phase angle shift (PPAS) is employed to control the output voltage. The operation principle of the converter is analyzed and experimental results obtained from a 400W prototype are presented to validate the performance of the proposed converter.

승압용 커패시터를 이용한 단상 배전압 AC-DC 컨버터 (The Single-Phase Voltage-Doubler AC-DC Converter by using a Boost Capacitor)

  • 정상화;김상돈;이수흠;이현우;전중함;정기환
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 2002년도 하계학술대회 논문집 B
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    • pp.1103-1105
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    • 2002
  • A conventional AC-DC boost converter has much variation of input current as more increased the load or output voltage by the hysterical control method that is comparing area of current pulse by using PWM method and integration to sinusoidal input current. To improve the problems. in this paper, we propose the single-phase voltage doubler AC-DC converter circuit using the capacitor for boost:confirm characteristics of normal and transition state by using simulation, be stabilized voltage of doubler capacitor for boost, and Identify to get the sinusoidal input current with unity power factor.

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단일 스위치 배전압 방식의 단상 PFC 컨버터의 전류 제어기법 비교 (Comparison of Current Control Method for Single-phase PFC converter with 1-switch Voltage Doubler Strategy)

  • 구대관;지준근;차귀수;임승범;홍순찬
    • 전력전자학회논문지
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    • 제17권1호
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    • pp.1-7
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    • 2012
  • This paper describes the performance comparison results for current controller of a single-phase PFC converter with 1-switch voltage doubler strategy for single-phase double-conversion UPS(Uninterruptible Power Supply). A single-phase PFC converter with 1-switch voltage doubler strategy needs a diode bridge and one bidirectional active switch. Thus it is possible to reduce the material cost. However, the study results of current controller design and comparison of current control method has not been known after the converter circuit was proposed. For the performance comparison of current control, single-phase 3 kVA double-conversion UPS was tested. The performance of PI and PR current controller is experimentally confirmed with followings - input current reference tracking, input power factor correction and input current THD suppression.

Current Doubler 정류기를 이용한 능동클램프형 포워드 컨버터 (An Active Clamp Forward Converter with a Current Doubler Rectifier)

  • 어성준;최재호;안태영
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 1997년도 하계학술대회 논문집 F
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    • pp.2020-2022
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    • 1997
  • An active clamp forward converter is proper for minimization and basically makes high efficiency of the system because of soft switching type. Especially, when applied to forward converter, it widens the control range of duty ratio and is suitable for high input voltage. In other hand, the current doubler has high utility efficiency of transformer and reduces output current ripple because it always transfers the power through the transformer and has two inductor with opposite slope. So, this paper explained the conduction mode of an active clamp forward converter with the current doubler rectifier.

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Coupled Inductor를 활용한 배전류 정류 회로를 적용한 LLC 직렬 공진 컨버터의 수식화 해석 (Mathematical Analysis of LLC Series Resonant Converter with Current Doubler Rectifier using Coupled Inductor)

  • 신정윤;황순상;윤병철;김학원;조관열
    • 전력전자학회논문지
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    • 제19권5호
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    • pp.440-449
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    • 2014
  • This study proposes an LLC series resonant converter with a current doubler using a coupled inductor as a rectification circuit for the secondary side. The current doubler circuit is generally used for a high-voltage input and low-voltage output circuit to obtain high efficiency with small transformer turn ratio. However, an inductive circuit is not generally used in the secondary side of an LLC series resonant converter. If inductive components exist on the secondary side, the resonant characteristics are changed through the secondary inductive circuit. Mathematical analysis shows that the secondary-side current doubler with coupled inductor is not affected by the resonant characteristic of the primary LLC if leakage inductance occurs in the coupled inductor. Results of the analysis are proven by simulation; an experiment is also conducted for the proposed circuit.

저전압 대전류용 개방형 DC-DC 컨버터 모듈에 관한 연구 (A Study on Open-frame Type DC-DC Converter Module for Low-Voltage High-Current Applications)

  • 안태영;황선민;조인호
    • 대한전기학회논문지:전기기기및에너지변환시스템부문B
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    • 제52권4호
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    • pp.183-190
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    • 2003
  • We report the performance of an open-frame type low-voltage high-current DC-DC converter module developed using an active clamp forward converter circuit and current doubler rectifier. The converter module is designed with the specifications of an 1.8V output voltage, 25A output current, and 36-75V input voltage. The synchronous rectifier is used to reduce the conduction fuss at high current level and current-mode control is adapted to enhance the flexibility in the system configuration. A prototype converter module is successfully implemented within 10mm height and half brick size (58${\times}$61mm), and recorded an 84% efficiency and 4% voltage regulation for the entire input voltage range, thereby demonstrating its application potentials to future telecommunication electronics.

저전압 대전류용 개방형 DC-DC 컨버터 모듈에 관한 연구 (A Study on Open-frame Type DC-DC Converter Module for Low-Voltage High-Current Applications)

  • 안태영;황선민;조인호
    • 대한전기학회논문지:전력기술부문A
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    • 제52권4호
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    • pp.183-183
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    • 2003
  • We report the performance of an open-frame type low-voltage high-current DC-DC converter module developed using an active clamp forward converter circuit and current doubler rectifier. The converter module is designed with the specifications of an 1.8V output voltage, 25A output current, and 36-75V input voltage. The synchronous rectifier is used to reduce the conduction fuss at high current level and current-mode control is adapted to enhance the flexibility in the system configuration. A prototype converter module is successfully implemented within 10mm height and half brick size (58×61mm), and recorded an 84% efficiency and 4% voltage regulation for the entire input voltage range, thereby demonstrating its application potentials to future telecommunication electronics.

고조파 규제값에 적합한 에어컨 전원장치 (Air-Conditioner Power Source Device to Meet the Harmonic Guide Lines)

  • 문상필;박영조;서기영
    • 대한전기학회논문지:전기기기및에너지변환시스템부문B
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    • 제51권10호
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    • pp.581-586
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    • 2002
  • To improve the current waveform of diode rectifiers, we propose a new operating principle for the voltage-doubler diode rectifiers. In the conventional voltage-doubler rectifier circuit, relatively large capacitors are used to boost the output voltage, while the proposed circuit uses smaller ones and a small reactor not to boost the output voltage but improve the input current waveform. A circuit design method is shown by experimentation and confirmed simulation. The experimental results of the proposed diode rectifier satisfies the harmonic guide lines. A high input power factor of 97(%) and an efficiency of 98[%] are also obtained. The new rectifier with no controlled switches meet the harmonic guide lines, resulting in a simple, reliable and low-cost at-to dc converters in comparison with the boost-type current-improving circuits. This paper proposes a nonlinear impedance circuit composed by diodes and inductors or capacitors. This circuit needs no control circuits and switches, and the impedance value is changed by the polarity of current or voltage. And this paper presents one of these applications to improve the input current of capacitor input diode rectifiers. The rectifier using the nonlinear impedance circuit is constructed with four diodes and four capacitors in addition to the conventional rectifiers, that is, it has eight diodes and five capacitors, including a DC link capacitor. It makes harmonic components of the input current reduction and the power factor improvement. Half pulse-width modulated (HPWM) inverter was explained compared with conventional pulse width modulated(PWM) inverter. Proposed HPWM inverter eliminated dead-time by lowering switching loss and holding over-shooting.

단일 스위치 배전압 방식의 단상 PFC 컨버터의 동작 특성 (Operation Characteristic of Single-phase PFC converter with 1-switch Voltage Doubler Strategy)

  • 구대관;지준근;차귀수;임승범;홍순찬
    • 전력전자학회논문지
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    • 제16권6호
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    • pp.561-568
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    • 2011
  • 본 논문은 단상 이중변환 무정전전원장치를 위한 단일 스위치 배전압 방식의 단상 PFC 컨버터의 동작 특성을 기술한다. 단일 스위치 배전압 방식의 단상 PFC 컨버터는 브릿지 다이오드와 양방향 능동 스위치 한 개만이 필요하며 재료비 절감이 가능하다. 하지만 이 회로가 제안된 후 동작 특성 및 제어기 설계에 대한 연구결과가 알려지지 않았다. 본 논문에서는 동작 특성과 제어기 설계방법을 기술하고 성능평가를 위해 단상 정격 3kVA 이중변환 무정전전원장치를 대상으로 실험을 수행하였다. 또한 실험을 통해 입력전류 제어, 입력역률 보상 성능을 확인하였다.

A New Single-Stage PFC AC/DC Converter with Low Link-Capacitor Voltage

  • Lee, Byoung-Hee;Kim, Chong-Eun;Park, Ki-Bum;Moon, Gun-Woo
    • Journal of Power Electronics
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    • 제7권4호
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    • pp.328-335
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    • 2007
  • A conventional Single-Stage Power-Factor-Correction (PFC) AC/DC converter has a link capacitor voltage problem under high line input and low load conditions. In this paper, this problem is analyzed by using the voltage conversion ratio of the DC/DC conversion cell. By applying this analysis, a new Single-Stage PFC AC/DC converter with a boost PFC cell integrated with a Voltage-Doubler Rectified Asymmetrical Half-Bridge (VDRAHB) is proposed. The proposed converter features good power factor correction, low current harmonic distortions, tight output regulations and low voltage of the link capacitor. An 85W prototype was implemented to show that it meets harmonic requirements and standards satisfactorily with near unity power factor and high efficiency over universal input.