• 전력전자학회:학술대회논문집
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• 전력전자학회 2010년도 추계학술대회
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• pp.188-189
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• 2010

This paper proposed a new zero-voltage switching(ZVS) Two-Inductor boost converter. The conventional Two-Inductor boost converter has defect. When the switch is turned off, the high voltage spike is occurred in the switch by leakage inductance and switch parasitic capacitor. To solve this problem, the parallel resonant capacitor is added to the conventional Two-Inductor boost converter. Using quasi-resonant between parallel resonant capacitance and leakage inductance, the switches is operated soft switching. A reduction of transformer turn ratio is achieved by the voltage doubler rectifier.

• ETRI Journal
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• 제44권5호
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• pp.759-768
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• 2022

A novel energy harvesting technique that uses conducted electromagnetic interference as an energy source is presented. Conducted EMI generated from fluorescent light using a switched-mode power supply was measured and modeled as an equivalent voltage source. Two types of rectifier circuits-a bridge rectifier and a voltage doubler-were used as the harvesting devices for conducted EMI source. The matching networks were designed based on the equivalent model, and the harvested power was improved. The implemented energy harvester produces a regulated power over 68.9 mW and current over 15.1 mA while a regulated voltage can be selected between 3.3 V and 5 V. The proposed system shows the highest harvesting power indoor environment and can provide enough power for the Internet of Things devices.

• Journal of Electrical Engineering and Technology
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• 제12권3호
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• pp.1187-1194
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• 2017

In this paper, a high step-up DC-DC PWM converter with continuous input current and low voltage stress is presented for renewable energy application. The proposed converter is composed of a boost converter integrated with an auxiliary step-up circuit. The auxiliary circuit uses an additional coupled inductor and a balancing capacitor with voltage doubler and switching capacitor technique to achieve high step-up voltage gain with an appropriate switch duty cycle. The switched capacitors are charged in parallel and discharged in series by the coupled inductor, stacking on the output capacitor. In the proposed converter, the voltage stress on the main switch is clamped, so a low voltage switch with low ON resistance can be used to reduce the conduction loss which results in the efficiency improvement. A detailed discussion on the operating principle and steady-state analyses are presented in the paper. To justify the theoretical analysis, experimental results of a 200W 40/400V prototype is presented. In addition, the conducted electromagnetic emissions are measured which shows a good EMC performance.

• 전력전자학회:학술대회논문집
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• 전력전자학회 2011년도 전력전자학술대회
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• pp.396-397
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• 2011

본 논문은 LLC 공진 컨버터를 이용한 고효율 슬림 아답터의 구조를 제안한다. 1차 측의 구리 권선과 2차 측을 그 외부에 PCB를 이용하는 새로운 구조의 슬림한 변압기가 제안되었다. 제안하는 구조는 쉬운 공정성과 넓은 도통 단면적을 가져 고효율의 슬림 컨버터에 적합하다. 또한 2차 측 권선의 간단한 구조를 위해 voltage-doubler 정류기와 출력 필터 사이즈를 줄이기 위해 CLC 필터가 사용되었다. 효과를 확인하기 위해 85W 컨버터를 제작하여 실험하였다.

• 조명전기설비학회논문지
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• 제24권1호
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• pp.105-111
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• 2010

본 논문에서는 배터리전원 또는 태양광과 연료전지 등의 신재생 전원에서 발생되는 저전압 에너지원을 고전압으로 변환하기 위한 DC-DC 컨버터의 설계에 대해 연구하였다. 입력 DC24[V] 전압을 출력전압 400[V]로 변환하기 위한 H-브리지 컨버터의 회로 토폴로지에 있어 출력측 전력 및 전압을 제어하기 위해 위상천이제어를 적용하여 구현하였다. 제안된 컨버터 시스템의 장점으로는 전류 스트레스 감소 및 높은 효율성, 신뢰성 및 단순화된 관리뿐만 아니라 저렴한 비용 등을 들 수 있으며, 가정용 전력 생산을 위한 시스템으로 매우 유용하다는 것을 알 수 있었다.

• 대한전자공학회논문지SD
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• 제46권2호
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• pp.93-100
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• 2009

본 논문에서는 전하 펌프(charge pimp) 방식의 전압 더블러(voltage doubler) 구조를 이용한 4채널 DC-DC 컨버터 개발을 소개한다. 무선 통신 트랜시버 내부에 위치하는 FEM(Front End Module)에서의 사용을 목표로 연구 개발 중인 정전 용량형 SP4T RF MEMS 스위치 구동용 DC-DC 컨버터를 개발하였다. 소비 전력이 적으며 작은 면적을 차지하는 전하 펌프 구조와 10MHz 스위칭 주파수를 이용하여 3.3V에서 $11.3{\pm}0.1V$, $12.4{\pm}0.1V$, $14.1{\pm}0.2V$로 승압한다. 전압 레벨 변환기(Voltage level shifter)를 이용하여 DC-DC 컨버터의 출력을 3.3V 신호로 선택적으로 온오프(on/off) 할 수 있으며 정전 용량형 MEMS 기기에 선택적으로 전달할 수 있도록 구현하였다. 칩 외부에 수동 소자를 추가하지 않고 칩 내부에 CMOS 공정 중에 제작된 저항과 커패시터만으로 원하는 출력을 낼 수 있도록 설계하였다. 전체 칩의 크기는 패드를 포함하여 $2.8{\times}2.1mm^2$이며 소비 전력은 7.52mW, 7.82mW, 8.61mW이다.

• 전기학회논문지
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• 제57권3호
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• pp.403-408
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• 2008

The gyroscope is the sensor for detecting the rotation in inertial reference frame and constitute the navigation system together an accelerometer. As the inertial reference equipment for attitude determination and control in the satellite, the mechanical gyroscope has been used but it bring the disturbance for mass unbalance so the disturbance give a bad influence to the observation satellite mission because the mechanical gyroscope has the rotation parts. During the launch. The mechanical gyroscope is weak in vibration, shock and has the defect of narrow operating temperature range so it need the special design in integration. Recently the low orbit observation satellite for seeking the high pointing accuracy of image camera payload accept the FOG(Fiber Optic Gyro) or RLG(Ring Laser Gyro) for the attitude determination and control. The Ring Laser Gyro makes use of the Sanac effect within a resonant ring cavity of a He-Ne laser and has more accuracy than the other gyros. It need the 1000V DC to create the He-Ne plasma in discharge tube. In this paper, the design process of the High Voltage Power Supply for RLG(Ring Laser Gyroscope) is described. The specification for High Voltage Power Supply (HVPS) is proposed. Also, The analysis of flyback converter topology is explained. The Design for the HVPS is composed of the inverter circuit, feedback control circuit, high frequency switching transformer design and voltage doubler circuit.

• Journal of Power Electronics
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• 제12권3호
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• pp.377-386
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• 2012

An interleaved bridgeless buck-boost AC/DC converter is presented in this paper to achieve the characteristics of low conduction loss, a high power factor and low harmonic and ripple currents. There are only two power semiconductors in the line current path instead of the three power semiconductors in a conventional boost AC/DC converter. A buck-boost converter operated in the boundary conduction mode (BCM) is adopted to control the active switches to achieve the following characteristics: no diode reverse recovery problem, zero current switching (ZCS) turn-off of the rectifier diodes, ZCS turn-on of the power switches, and a low DC bus voltage to reduce the voltage stress of the MOSFETs in the second DC/DC converter. Interleaved pulse-width modulation (PWM) is used to control the switches such that the input and output ripple currents are reduced such that the output capacitance can be reduced. The voltage doubler topology is adopted to double the output voltage in order to extend the useable energy of the capacitor when the line voltage is off. The circuit configuration, principle operation, system analysis, and a design example are discussed and presented in detail. Finally, experiments on a 500W prototype are provided to demonstrate the performance of the proposed converter.

• Journal of Power Electronics
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• 제15권4호
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• pp.1131-1138
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• 2015

This study presents an input-powered high-efficiency interface circuit for energy harvesting systems, and introduces a zero standby power design to reduce power consumption significantly while removing the external power supply. This interface circuit is composed of two stages. The first stage voltage doubler uses a positive feedback control loop to improve considerably the conversion speed and efficiency, and boost the output voltage. The second stage active diode adopts a common-grid operational amplifier (op-amp) to remove the influence of offset voltage in the traditional comparator, which eliminates leakage current and broadens bandwidth with low power consumption. The system supplies itself with the harvested energy, which enables it to enter the zero standby mode near the zero crossing points of the input current. Thereafter, high system efficiency and stability are achieved, which saves power consumption. The validity and feasibility of this design is verified by the simulation results based on the 65 nm CMOS process. The minimum input voltage is down to 0.3 V, the maximum voltage efficiency is 99.6% with a DC output current of 75.6 μA, the maximum power efficiency is 98.2% with a DC output current of 40.4 μA, and the maximum output power is 60.48 μW. The power loss of the entire interface circuit is only 18.65 μW, among which, the op-amp consumes only 2.65 μW.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2006년도 춘계학술대회 논문집 전기기기 및 에너지변환시스템부문
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• pp.362-364
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• 2006

This paper presents a novel DC-DC Converter for 3 [kW] Fuel Cell System Residential Application. Phase shifted control is employed to regulate the output voltage and achieve soft switching. The transformer leakage inductance is utilized effectively to achieve zero voltage turn on for the power semiconductor switches. The current doubler rectifier has only one diode drop. The transformer secondary winding current rating is one half the load current. The overall effciency of the converter is improved.