• Journal of Information Display
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• 제9권2호
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• pp.9-13
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• 2008

A novel push-pull voltage converter structure, using a switched capacitor type voltage doubler, is proposed. The circuit is constructed with a two-stage push-pull voltage doubler that has a stable operation with small output ripple. The two-stage voltage doubler creates the output voltage 4Vdd. The high clock signal is cross-coupled to the input of the second stage with the opposite phase to reduce two switching transistors and capacitors. Simulation results verify that even with a reduced number of transistor and capacitor, there is no circuit performance loss. Adding one capacitor and two switching transistors the circuit can be changed to eight times of Vdd maker.

• 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.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2009년도 제40회 하계학술대회
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• pp.961_962
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• 2009

A novel, two-inductor, interleaved power-factor-corrected (PFC) boost converter that exhibits voltage-doubler characteristic when it operates with a duty cycle greater than 0.5 is introduced. The voltage-doubler characteristic of the proposed converter makes it quite suitable for universal-line (90~265VRMS) PFC applications. Because the proposed PFC boost rectifier operates as a voltage doubler at low line, its low-line range efficiency is greatly improved compared to that of its conventional counterpart. The performance of the proposed PFC rectifier was evaluated on an experimental 300W PFC prototype.

• 전력전자학회논문지
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• 제20권3호
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• pp.280-289
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• 2015

A high-efficiency full-bridge DC-DC converter with a current-doubler rectifier and an asymmetric pulse-width modulation is proposed. Through the asymmetric pulse-width modulation, the proposed converter achieves zero-voltage switching of power switches without the circulating currents. The proposed converter reduces the output current ripple through the current-doubler rectifier. A control strategy is suggested for the proposed converter to charge battery banks. A constant current and constant voltage charging is performed. The proposed converter achieved a higher efficiency compared with the conventional full-bridge DC-DC converter with a phase-shift modulation. The performance of the proposed converter is evaluated by the experimental results for a 1.0 kW prototype circuit.

• 한국정보통신학회논문지
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• 제16권8호
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• pp.1741-1746
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• 2012

본 논문에서는 기존의 Dickson's charge pump에 개선된 배전압 회로를 조합하여 구성된 고전압 출력에 용이한 전압 증배기 회로를 소개한다. 기존의 charge pump로 얻어진 전압을 승압에 다시 사용하는 구조로 배전압기를 응용하여 전압 증배를 가속화 하면서도 DMOS의 구조적 신뢰성을 저하하지 않도록 회로 구조를 제안하였다. 제안된전압증배기는 3V 입력 전원의 6단 회로 구성으로 약 33V의 출력을 내며 6단 이상의 구성으로 고전압 증배도 가능하다. 제안된 회로의 성능을 평가하기 위해 Magna DMOS 공정을 이용하여 시뮬레이션 하였으며 이론적인 증배와 일치함을 보였여 최소한의 소자 사용으로 고전압 전압 증배가 가능한 새로운 전압 증배기를 제시하였다.

• Journal of Power Electronics
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• 제7권1호
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• pp.21-27
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• 2007

This paper investigates a PID fuzzy controller for output voltage regulation of a current-doubler-rectified asymmetric half-bridge (CDRAHB) DC/DC converter. The controller is a PD-type fuzzy controller in parallel with a linear integral controller. The PD type fuzzy controller is for providing the varying gain at the different operating conditions to regulate the output voltage. The linear integral controller is for removing the steady-state error of the output voltage. In order to show the outstanding dynamic characteristics of the proposed controller, PSIM simulation studies are carried out and compared to the results for which the conventional loop gain design method is used.

• 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.

• 전기학회논문지P
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• 제60권1호
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• pp.48-52
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• 2011

Over the years, traditionally, six-switch three-phase inverters have been widely utilized for variable speed alternating current motor drives. Recently, some efforts have been made on the application of four-switch three phase inverter for uninterruptible power supply and variable speed drives. This is due to some advantages of the four-switch three phase inverter over the conventional six-switch three-phase inverters such as reduced price due to reduction in number of switches, reduced switching losses, reduced number of interface circuits to supply logic signals for the switches, simpler control algorithms to generate logic signals, less chances of destroying the switches due to lesser interaction among switches, and less real-time computational burden. However such as slow di/dt and speed limitation, are the inherent characteristics and main drawbacks of the four-switch configuration. Those problems can be overcome in conjugation with Voltage-doublers which has additional advantage, such as unity power factor correction.

• 조명전기설비학회논문지
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• 제23권12호
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• pp.127-135
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• 2009

본 연구에서는 2개의 인덕터를 이용한 인터리브 AC/DC 승압형 컨버터의 듀티 사이클이 0.5 이상일 때 배압 회로 특징을 나타내었다. 일반적으로 AC/DC 승압형 컨버터는 낮은 입력전압(입력 AC 110[V])이 높은 입력전압(입력 AC 220[V])에 비하여 낮은 효율을 갖는다. 제안된 인터리브 AC/DC 승압형 컨버터는 낮은 입력전압에서 배압 회로로 동작함으로 인하여 낮은 입력전압을 사용하는 기존의 컨버터와 비교하여 높은 역률과 향상된 효율을 갖는다. 본 연구에서는 배압 회로 동작하는 하는 인터리브 AC/DC 승압형 컨버터를 제안하고, 모드별 해석과 특성을 논의하였으며, 300[W]급 시작품을 제작하여 그 타당성을 검증하였다.

• 전력전자학회:학술대회논문집
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• 전력전자학회 2005년도 전력전자학술대회 논문집
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• pp.445-448
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• 2005

PDP 유지전원단을 위한 고효율을 갖는 새로운 페이지 쉬프트 풀브릿지 컨버터를 제안한다. 제안된 컨버터는 Rectifier로 Voltage Doubler를 사용함으로서, 큰 사이즈의 Output Inductor가 없게 되어 간단한 구조를 가지게 되며 Rectifier Diodes의 전압 스트레스가 출력전압으로 클램핑되어서 스너버회로가 필요없다는 장점을 가지게 된다. 또한 넓은 영전압 스위칭 구간을 가지며, 트랜스포머의 기생성분인 Leakage 인덕터와 Voltage doubler의 캐패시터간의 공진을 이용함으로서 전류가 작은 RMS값을 가지게 되어서 낮은 도통손실과 Rectifier Diode의 전류 스트레스 또한 낮다는 장점을 가지게 된다. 본 논문을 통해 제안된 컨버터의 동작원리와 해석, 실험을 수행하였다.