• 전력전자학회:학술대회논문집
• /
• 전력전자학회 2006년도 전력전자학술대회 논문집
• /
• pp.140-142
• /
• 2006

This paper represents a digital parallel control of a synchronous buck converter using a digital signal processor (DSP). The digital PWM and load sharing controller is implemented in the DSP TMS320F2812 and the experimental results are provided to show the feasibility of the digital synchronous buck regulator.

• Journal of Power Electronics
• /
• 제14권2호
• /
• pp.217-225
• /
• 2014

This paper deals with the optimization of the driving techniques for the ZVT synchronous buck converter proposed in [1]. Two new gate drive circuits are proposed to allow this converter to operate by only one control signal as a 12V voltage regulator module (VRM). Voltage-driven method is applied for the synchronous rectifier. In addition, the control signal drives the main and auxiliary switches by one driving circuit. Both of the circuits are supplied by the input voltage. As a result, no supply voltage is required. This approach decreases both the complexity and cost in converter hardware implementation and is suitable for practical applications. In addition, the proposed SR driving scheme can also be used for many high frequency resonant converters and some high frequency discontinuous current mode PWM circuits. The ZVT synchronous buck converter with new gate drive circuits is analyzed and the presented experimental results confirm the theoretical analysis.

• 전력전자학회논문지
• /
• 제18권4호
• /
• pp.359-366
• /
• 2013

This paper proposes a zero-current-transition(ZCT) synchronous buck converter using auxiliary circuit with soft-switching for light weight and high efficiency. In this scheme, an auxiliary circuit is added to the conventional synchronous rectifier buck converter and used to achieve soft-switching condition for both the main switch and synchronous switch. In addition, the switch in the auxiliary circuit operates under soft-switching conditions. Thus, the proposed converter provides a higher efficiency. The basic operations, in this paper, are discussed and design guidelines are presented. The usefulness of the proposed converter is verified on a 200KHz, 20 W prototype converter.

• 한국멀티미디어학회논문지
• /
• 제19권2호
• /
• pp.352-359
• /
• 2016

This paper presents high efficiency 5A synchronous DC-DC buck converter. The proposed DC-DC buck converter works from 4.5V to 18V input voltage range, and provides up to 5A of continuous output current and output voltage adjustable down to 0.8V. This chip is packaged MCP(multi-chip package) with control chip, top side P-CH switch, and bottom side N-CH switch. This chip is designed in a 25V high voltage CMOS 0.35um technology. It has a maximum power efficiency of up to 94% and internal 3msec soft start and fixed 500KHz PWM(Pulse Width Modulation) operations. It also includes cycle by cycle current limit function, short and thermal shutdown protection circuit at 150℃. This chip size is 2190um*1130um includes scribe lane 10um.

• 전력전자학회:학술대회논문집
• /
• 전력전자학회 2016년도 전력전자학술대회 논문집
• /
• pp.203-204
• /
• 2016

무선전력전송은 특성상 수신부에 수신되는 전압이 일정하지 않기 때문에 수신부에 넓은 입력 범위를 갖는 정전압 컨버터가 요구된다. 그 중 Buck-Boost 컨버터는 넓은 입력 범위를 갖기 때문에 무선전력전송 수신부의 정전압 컨버터로 많이 사용 되었다, 본 논문에서는 기존의 Buck-Boost 컨버터의 효율 향상을 위해 Synchronous Buck-Boost 컨버터를 제안하고 시뮬레이션을 통해 두 컨버터를 비교하여 개선된 결과를 확인하였다.

• 전기전자학회논문지
• /
• 제15권4호
• /
• pp.319-323
• /
• 2011

본 논문에서는 Mobile 기기의 다양한 기능을 지원하기 위해 사용되는 내부 회로들의 낮은 전압 레벨을 지원하기위해 가장 널리 사용되는 SMPS(Switch Mode Power Supply)방식의 Buck converter를 설계한다. 제안된 Buck converter는 넓은 부하 영역에서 높은 효율을 가지는 것을 목적으로 일반적인 구동 방식인 PWM (Pulse Width Modulation)Mode의 고 효율 저 리플 특성 구현 외에 PFM(Pulse Frequency Modulation) Mode를 적용하여 낮은부하 조건 혹은 부하를 사용하지 않는 대기 시간에서도 고 효율 저 리플 특성을 가지는 Dual mode synchronous buck converter를 설계한다. 이를 위해 본 논문에서는 부하 변동 시에 PWM - PFM Mode로의 효율적인 변환방법 및 저 리플 특성을 위한 방법을 제안한다. 또한 제안된 IC는 Mobile 기기에 부합하는 입력 전압 범위 2.5V-5V를 가지며, 2.5Mhz의 높은 주파수로 동작하여 리플 특성이 양호하고 집적화가 유리하다. 고효율을 위하여 Synchronous Type 설계 및 Dynamic Control 방식을 적용하였다. 보호 기능으로는 회로 동작의 초기 시에 발생하는 Inrush Current를 방지하기 위한 Soft start function 외에 Current limit, Thermal shutdown function, UVLO 회로가 내장되어 신뢰성을 높였다.

• Journal of Power Electronics
• /
• 제10권3호
• /
• pp.235-244
• /
• 2010

This paper presents a new isolated soft-switching bidirectional buck-boost inverter for fuel cell applications. The buck-boost inverter combines an isolated DC-DC converter with a conventional inverter to implement buck-boost DC-DC and DC-AC conversion. The main switches achieve zero voltage switching and zero current switching by using a novel synchronous switching SVPWM and the volume of the transformer in the forward and fly-back mode is also minimized. This inverter is suitable for wide input voltage applications due to its high efficiency under all conditions. An active clamping circuit reduces the switch's spike voltage and regenerates the energy stored in the leakage inductance of the transformer; therefore, the overall efficiency is improved. This paper presents the operating principle, a theoretical analysis and design guidelines. Simulation and experimental results have validated the characteristics of the buck-boost inverter.

• 전력전자학회논문지
• /
• 제17권4호
• /
• pp.330-336
• /
• 2012

In this paper, novel zero-voltage-transition(ZVT) synchronous buck converter of pulse-width-modulation(PWM) method is proposed to utilize auxiliary circuit. In this proposed scheme, designed to operate low output voltage for portable system and applied synchronous scheme to improve efficiency. Also proposed circuit is designed to do soft-switching operation in every switch. In this paper, the circuit operation is explained and analysed, and design guidelines are presented. To verify the availability of the proposed circuit, experiment and simulation is carried out.

• 전력전자학회:학술대회논문집
• /
• 전력전자학회 2016년도 추계학술대회 논문집
• /
• pp.15-16
• /
• 2016

This paper proposes an isolated DCDC converter that consists of unregulated LLC resonant converter and non-isolated synchronous buck converter for battery charger of energy storage systems application. The unregulated converter operates as transformer with fixed duty ratio and switching frequency. The synchronous buck converter is installed in the output of the LLC resonant converter. And the converter charges and discharges the battery by controlling a current of battery. The proposed converter can get the high efficiency by separating function. This paper explains design of an unregulated converter and synchronous converter.

• 조명전기설비학회논문지
• /
• 제17권3호
• /
• pp.32-39
• /
• 2003

동기발전기 출력전압은 여자시스템의 계자전류 제어에 의해 일정하게 유지된다. 고주파 PWM 컨버터(전류제어 모드 buck 컨버터) 형태의 여자시스템은 부하변동이 발생하였을 때 동기발전기의 계자전류를 제어하게 된다. 이 논문은 정상상태 및 과도상태에서의 안정화를 개선하기 위하여 여자시스템의 설계 및 실험에 대해 다루었다. 시뮬레이션 및 실험 결과는 제안된 여자시스템이 50[kW] 동기발전기의 DVR에 의해 응답시간이 개선되었음을 보여주었다.