• Journal of Power Electronics
• /
• v.4 no.2
• /
• pp.77-86
• /
• 2004

This paper presents a novel three-phase power module bridge type auxiliary resonant AC link snubber for the three-phase voltage-fed sinwave soft switching PWM inverter operating under specific instantaneous space voltage vector modulation. The operating principle of this resonant snubber is described for current source load model during one switching period, along with its design approach based on the simulation data. The performance evaluations of space vector modulation three-phase sinewave soft switching inverter with a new three-phase active auxiliary resonant AC link snubber are discussed as compared with those of three-phase voltage source-fed sinewave hard switching PWM inverter with a standard space voltage vector modulation strategy. The power loss analysis and conventional efficiency estimation of three-phase soft switching PWM inverter using ICBT modules are carried out including all the conduction power losses based upon the measured v-i characteristics of IGBT and its antiparallel diode as well as their switching losses.

• Proceedings of the KIPE Conference
• /
• 1998.10a
• /
• pp.113-118
• /
• 1998

In modern mechatronics new concepts of machines and processes are found by using the collected knowledge of all disciplines and by offering functional solutions. Most of the problems in the field of mechatronics demand technical innovations on the field of actuators, sensors and control methods. It demands also high dynamic drives with power electronics, able to cope with the new requirements. The paper presents some trends and industrial experiences with power components for high dynamic drives.

• Journal of Power Electronics
• /
• v.8 no.2
• /
• pp.109-120
• /
• 2008

In this paper, a novel delta/double-fork transformer based 18-pulse full-wave AC-DC converter is designed, modeled, simulated and developed to feed isolated DC varying loads. The proposed AC-DC converter is used for low voltage and large current DC loads in applications such as electrowinning, where isolation is required mainly for stepping down the supply voltage. The proposed converter improves power quality at AC mains and meets IEEE-519 standard requirements at varying loads.

• Proceedings of the KIPE Conference
• /
• 2007.11a
• /
• pp.63-65
• /
• 2007

본 논문에서는 변압기를 이용한 단일형 전력회수회로 및 구동 회로를 제안한다. 제안된 회로는 변압기를 이용하여 회수 콘덴서 대체 및 다이오드를 제거하여 전력회수회로를 단순화 한다. 양전원을 이용하여 기존 구동회로의 소거방전시 필요한 주 경로상 직렬 단방향 스위치도 제거된다. 모의 실험을 통해 이용하여 제안된 회로의 타당성을 검토한다.

• Journal of Power Electronics
• /
• v.17 no.1
• /
• pp.190-199
• /
• 2017

In this paper, a predictive direct power control (DPC) method based on a Kalman filter is presented for three-phase pulse-width modulation (PWM) rectifiers to improve the performance of rectifiers with source voltages that are distorted with harmonic components. This method can eliminate the most significant harmonic components of the source voltage using a Kalman filter algorithm. In the process of predicting the future real and reactive power to select an optimal voltage vector in the predictive DPC, the proposed method utilizes source voltages filtered by a Kalman filter, which can mitigate the adverse effects of distorted source voltages on control performance. As a result, the quality of the source currents synthesized using the PWM rectifier is improved, and the total harmonic distortion (THD) values are reduced, even under distorted source voltages.

• Proceedings of the KIPE Conference
• /
• 1998.10a
• /
• pp.687-693
• /
• 1998

An improved zero voltage and zero current switching (ZVZCS) full bridge (FB) PWM converter is proposed to solve the problems of the previously presented ZVACS-FB-PWM converter with secondary active clamp such as narrow ZVS range of leading-leg switches [6]. By adding an auxiliary inductor in between the leading-leg and separated input source voltages, the ZVS of leading leg switches can be extended to the whole line and load ranges, which eliminates unwanted hard switching of clamp switch and simplifies its control. The principle of operation is explained and analyzed. The features and design considerations of the proposed converter are also illustrated and verified on a 3 kW, 100 KHz IGBT based experimental circuit.

• Proceedings of the KIPE Conference
• /
• 2006.06a
• /
• pp.375-377
• /
• 2006

본 논문에서는 LLC 공진형 컨버터의 최적 설계를 위해, ZVS 영역에서 동작하는 LLC 공진형 컨버터의 최악의 상태에 대한 정상 상태 해석을 하였다. LLC 공진형 컨버터의 최악의 상태는 최소 입력 전압, 최대 부하 전류일 때 얻을 수 있는 최대 전압 이득을 의미한다. 설계 변수는 스위칭 주파수 범위와 공진 인덕터 비율로서, 각 설계 변수의 변화에 따른 공진 탱크 설계 값, 최악의 상태 출력 전압 그리고 최대 공진 캐패시터 전압을 보여주는 '최악의 조건 설계 표'를 나타내었으며, 설계된 특정 공진 탱크 값에 대한 시뮬레이션 결과와 실험 결과를 보였다.

• Proceedings of the KIPE Conference
• /
• 2006.06a
• /
• pp.384-386
• /
• 2006

본 논문에서는 AC Plasma display panel(AC-PDP) 구동을 위한 Six-switch를 적용한 Three-level PDP Sustain 회로를 제안한다. 제안 회로는 기존 회로의 Sustain 스위치와 Clamp 다이오드의 내압이 절반이 되어 특성이 우수한 반도체 소자의 채택이 가능하며, 환류 전류가 저감되어 높은 전력 효율을 가지는 장점을 가지므로 AC-PDP 구동 회로 설계에 매우 적합하다. 본 논문에서는 기존 회로와 제안 회로의 전도 손실 계산 및 시뮬레이션과 실험 결과를 보였다.

• Proceedings of the KIPE Conference
• /
• 1998.10a
• /
• pp.425-430
• /
• 1998

This paper presents a high performance low switching PWM technique for the propulsion system of railway such as subway and high speed train. In order to achieve the continuous voltage control to six-step and a low harmonics with low switching frequency under 500Hz, the synchronous PWM technique is combined with a space vector overmodulation and implemented by using DSP. Improved performance and a validation of proposed method are showed by the digital simulation and the experimental results using a 1.65MVA IGBT VVVF inverter and inertia load equivalent to 160 tons railway vehicles.

• Proceedings of the KIPE Conference
• /
• 2006.06a
• /
• pp.119-121
• /
• 2006

본 논문은 중 전력, 고 입력 전압응용에서 많이 이용되는 비대칭 하프브릿지 PWM DC-DC 컨버터의 다중 출력 구성을 위한 최적의 설계 방식을 제안한다. 제안된 방식은 기본 PWM에서 부하에 따른 연속전류동작모드(CCM)의 구간을 늘여, 제어되는 전원의 부하 변동이 크더라도, 다중출력 되어지는 전원의 정상상태 동작점의 변동이 크게 발생하지 않도록 한다. 제어되는 비대칭 하프브릿지(ASHB)의 부하에 따른 시비율 변화가 작아지면 경 부하에서 변압기에 인가되는 전압의 크기가 줄어들어 다중 출력 되어지는 단의 전체적인 전압 스트레스가 감소한다. 또한 제안된 방식의 비대칭 하프브릿지 회로는 기존의 1차 측 전류 비대칭성을 보상하여 보다 넓은 부하 영역에서 영전압 스위칭이 가능하며 스위칭 손실과 이에 의한 EMI가 감소하게 된다. 제안된 방식은 기존 하드웨어와 비교하여 그 성능을 검증하였다.