• 전력전자학회논문지
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• 제13권6호
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• pp.461-468
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• 2008

본 논문에서는 연료전지용 전력변환 장치에서 높은 승압비를 구현하기 위하여 절연형 풀브릿지 컨버터의 고주파 변압기 2차측을 직렬로 연결한 새로운 DC/DC 컨버터와 이에 적합한 가변 위상변위 스위칭 방식을 제안하였다. 제안된 컨버터는 기존 방식에 비해 정류부와 필터부의 일원화가 가능한 구조로 출력레벨의 증가를 위해 컨버터의 수를 증가 하더라도, 수동소자의 수를 대폭 줄일 수 있다. 제안된 직렬 방식의 컨버터의 출력전압은 기존의 일정위상변위 스위칭 방식으로는 극성이 반대로 되는 구간이 발생하므로, 제안된 전력변환기에 적합한 간단한 가변 위상 변위 스위칭 방식을 적용함으로써, 출력전압의 감소문제를 해결하였으며, 시뮬레이션과 실험을 통하여 제안된 방식의 타당성을 검증하였다.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2009년도 춘계학술대회 논문집 특별세미나,특별/일반세션
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• pp.623-628
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• 2009

There is an increasing demand for efficient high power/weight auxiliary power supplies for use on high speed traction application. Many new conversion techniques have been proposed to reduce the voltage and current stress of switching components, and the switching losses in the traditional pulse width modulation(PWM) converter. Especially, the phase shift full bridge zero voltage switching PWM techniques are thought most desirable for many applications because this topology permits all switching devices to operate under zero voltage switching(ZVS) by using circuit parasitic components such as leakage inductance of high frequency transformer and power device junction capacitance. The proposed topology is found to have higher efficiency than conventional soft-switching converter. Also it is easily applicable to phase shift full bridge converter by applying an energy recovery snubber consisted of fast recovery diodes and capacitors.

• Journal of Power Electronics
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• 제16권3호
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• pp.915-924
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• 2016

A digital self-sustained phase shift modulation (DSSPSM) strategy that allows for good soft switching and dynamic response performance in the presence of step variations is presented in this paper. The working principle, soft switching characteristics, and voltage gain formulae of a LLC converter with DSSPSM have been provided separately. Furthermore, the method for realizing DSSPSM is proposed. Specifically, some key components of the proposed DSSPSM are carefully investigated, including a parameter variation analysis, the start-up process, and the zero-crossing capture of the resonant current. The simulation and experiment results verify the feasibility of the proposed control method. It is observed that the zero voltage switching of the switches and the zero current switching of the rectifier diodes can be easily realized in presence of step load variations.

• 전기학회논문지P
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• 제51권1호
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• pp.10-17
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• 2002

Due to the development of information communication field, the interest of the SMPS(Switched Mode Power Supply) is increased. The size and weight of SMPS are decided by inductor, capacitor and transformer. Thus, the low loss converter which is operated in high speed switching is required. The resonant FB DC-DC converter is able to operate in high speed switching and apply to high power field because the switching loss is low. In this thesis, it is proposed to control strategy for constant output power of resonant FB DC-DC converter in variable input voltage. The proposed control system is a digital I-PD type control and apply to phase-shift resonant type controller. The output voltage tracks reference without steady state error in variable input voltage. The validity of proposed control strategy is verified from results of simulation and experiment.

• 전기의세계
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• 제27권6호
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• pp.63-68
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• 1978

To convert into multiphase from single phase are often necessary for industry field. In oder to convert of phase, phase shifted voltages are first buileded by single phase and then must combine with these voltages adequately. This paper aims at the description of the way of phase shift by means of turning on or turning off through natural commutation and forced commutation methods with firing angle of thyristor pating a role of switching controlled adequately. Experimental result of the Phase Shift with the Thyristors Utilized has been turned out to shift the phase to 60.deg., 90.deg., 120.deg., and other angles.

• Journal of international Conference on Electrical Machines and Systems
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• 제1권3호
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• pp.366-371
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• 2012

In this paper, we propose an electric circuit using one common-arm of H-Bridge inverters to reduce the number of switching components in the multi-level inverter combined with H-Bridge inverters and transformers. And furthermore, we suggested a new multi-level PWM inverter using PWM level to reduce THD (Total Harmonic Distortion). We use a phase-shift switching method that has the same rate of usage at each transformer. Also, we test the proposed prototype 9-level inverter to clarify the proposed electric circuit and reasonableness of the control signal for the proposed multi-level PWM inverter.

• 조명전기설비학회논문지
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• 제19권7호
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• pp.100-106
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• 2005

일반적으로 자외선(UV)을 발생하기 위한 방전등 구동용 직류 전원장치는 하드 스위칭 모드로 동작되어지는 고주파 스위칭 DC-DC 컨버터가 사용되고 있다. 구체적으로 전원장치는 전자 노이즈 장해에 의한 전자 회로의 오동작이나 각 구성 소자의 발열의 문제 등이 시스템의 신뢰성을 저하시키는 원인이 되고 있다. 그러므로 본 논문에서는 소프트 스위칭 회로 기술을 사용한 고주파 링크 DC-DC 컨버터로서 먼저 구체적으로 1차측 위상 천이 PWM DC-DC 컨버터와 제안한 2차측 위상 천이 PWM DC-DC 컨버터를 조합하여 방전등 구동용 직류 전원장치를 제안하였다. 제안하는 방전등 구동용 직류 전원장치는 시뮬레이션과 실험을 통하여 그 타당성을 서술하였다.

• 조명전기설비학회논문지
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• 제14권1호
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• pp.109-117
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• 2000

본 논문은 고주파 유도가열용 전원에 사용되는 인버터에 WVF 기능을 부여한 풀-브릿지형 복공진 고주파 인버터회로를 제시하였다. 제안한 인버터는 직렬공진회로의 전류를 병렬공진회로의 주입전류로 사용하기 때문에 스위치의 전류 분담을 감소시킬 수 있으며, 또한 본 논문은 Phase-shift를 이용하여 스위칭 주파수와는 무관한 독립 출력 제어를 행하였다. 회로의 해석은 정규화 파라메타를 도입하여 범용성 있게 기술하였고, 인버터 특성을 스위칭 주파수, Phase-shift의 위상차각($\phi$) 변화와 제 파라메타에 따라 특성평가를 행하였다. 또한, 이론해석에서 얻은 특성값을 기초로 한 회로 설계 기법의 일 예도 제시하였다. 첨가해서, 실험을 통해 이론 해석의 타당성을 검증하였으며, 향후 유도가열 응용, OC-OC 컨버터 등의 전원 시스템에 웅용 가능성을 보여주고 있다.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2000년도 하계학술대회 논문집 B
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• pp.1168-1170
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• 2000

A half bridge time sharing type high frequency resonant inverter to give VVVF function in the inverter used as power source of induction heating at high frequency is presented in this paper, this paper also realize the output control of independence irrespective of the switching frequency using Phase-Shift. The analysis of the proposed circuit is generally described by using the normalized parameters. Also, the principle of basic operation and the its characteristics are estimated by the parameters, such as switching frequency, the variation of phase angle(${\varphi}$) of Phase-Shift. It is certain that the proposed circuit will be used and expanded in the high frequency power supplies like induction heating systems.

• 전력전자학회논문지
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• 제23권3호
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• pp.190-198
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• 2018

This paper proposes a nonisolated, bidirectional, soft-switching DC - DC converter with PWM plus phase shift (PPS) control. The proposed converter has an input-parallel/output-series configuration and can achieve the interleaving effect and high voltage gains, resulting in decreased voltage ratings in all related devices. The proposed converter can operate under zero-voltage switching (ZVS) conditions for all switches in continuous conduction mode. The power flow of the proposed converter can be controlled by changing the phase shift angle, and the duty is controlled to balance the voltage of four high voltage side capacitors. The PPS control device of the proposed converter is simple in structure and presents symmetrical switching patterns under a bidirectional power flow. The PPS control also ensures ZVS during charging and discharging at all loads and equalizes the voltage ratings of the output capacitors and switches. To verify the validity of the proposed converter, an experimental investigation of a 2 kW prototype is performed in both charging and discharging modes under different load conditions and a bidirectional power flow.