• 제목/요약/키워드: PWM(Pulse Width Modulation) converter

검색결과 264건 처리시간 0.029초

블로킹커패시터를 이용한 향상된 위상천이 펄스폭변조 풀브리지 컨버터 (Improved Phase-shift Pulse-width Modulation Full-bridge Converter using a Blocking Capacitor)

  • 정강률
    • 조명전기설비학회논문지
    • /
    • 제25권8호
    • /
    • pp.20-29
    • /
    • 2011
  • This paper presents an improved phase-shift pulse-width modulation (PWM) full-bridge converter using a blocking capacitor. As the proposed converter reduces the circulation energy by inserting only one series blocking capacitor at the primary side of the conventional phase-shift PWM full-bridge converter structure, it improves the operation characteristics of the conventional converter. In this paper, first, the operation of conventional phase-shift PWM full-bridge converter is roughly reviewed, and then the operational principle of the proposed converter is classified and explained by each mode. After that, a prototype design example based on the operational principle is shown. Then, the improved operation characteristics of the proposed converter are actually verified through the experimental results.

A 40-W Flyback Converter with Dual-Operation Modes for Improved Light Load Efficiency

  • Kang, Jin-Gyu;Park, Jeongpyo;Gong, Jung-Chul;Yoo, Changsik
    • JSTS:Journal of Semiconductor Technology and Science
    • /
    • 제15권4호
    • /
    • pp.493-500
    • /
    • 2015
  • A flyback converter operates with either pulse width modulation (PWM) or pulse frequency modulation (PFM) control scheme depending on the load current. At light load condition, PFM control is employed to reduce the switching frequency and thereby minimize the switching power loss. For heavier load, PWM control is used to regulate the output voltage of the flyback converter. The flyback controller has been implemented in a $0.35{\mu}m$ BCDMOS process and applied to a 40-W flyback converter. The light-load power efficiency of the flyback converter is improved up to 5.7-% comparing with the one operating with a fixed switching frequency.

새로운 변조방식을 사용한 단상 인버터 시스템 (Single-Phase Inverter System Using New Modulation Method)

  • 이형주;원화영;임승범;홍순찬
    • 조명전기설비학회논문지
    • /
    • 제24권5호
    • /
    • pp.29-36
    • /
    • 2010
  • 본 논문에서는 새로운 변조방식을 사용한 단상 인버터 시스템을 제안한다. 제안한 시스템은 buck-boost 변환기와 인버터로 구성되며 새로운 변조방식인 PWAM(Pulse Width/Amplitude Modulation)방식을 사용하여 제어한다. PWAM방식은 PWM(Pulse Width Modulation)방식과 PAM(Pulse Amplitude Modulation) 방식이 혼합된 새로운 변조방식이며 인버터의 입력단에 위치한 buck-boost 변환기는 일정한 직류전압을 입력으로 받아 가변 직류전압으로 변환한다. 인버터는 buck-boost 변환기에서 출력된 가변 직류전압을 입력으로 하며, PWM 구간에서는 PWM 스위칭을 하고 PAM 구간에서는 인버터가 스위칭을 하지 않음으로써 정현 교류전압으로 변환한다. 제안한 PWAM방식을 사용한 단상 인버터 시스템은 PAM 구간에서 스위칭 동작을 하지 않으므로 기존의 방식에 비해 스위칭 횟수가 감소하여 스위칭 손실을 줄일 수 있다.

Direct Duty Ratio Pulse Width Modulation Method for Matrix Converters

  • Li, Yulong;Choi, Nam-Sup;Han, Byung-Moon;Kim, Kyoung-Min;Lee, Buhm;Park, Jun-Hyub
    • International Journal of Control, Automation, and Systems
    • /
    • 제6권5호
    • /
    • pp.660-669
    • /
    • 2008
  • This paper presents a new carrier based pulse-width modulation (PWM) method for matrix converters. By using the concept of average over one switching period, the modulation algorithm and the required equations are derived to synthesize the desired output voltage and to achieve the controlled input power factor. The proposed method uses a continuous carrier and the predetermined duty ratio signals to directly generate the gating signals and, thus, is referred to as "direct duty ratio PWM (DDPWM)". The feasibility and validity of the proposed method were verified by simulation and experiment.

전기차용 전력변환장치의 펄스 폭 변조 기법 분석 (Analysis of Pulse Width Modulation Schemes for Electric Vehicle Power Converters)

  • ;채상헌;김일환;양승용;부창진;김호찬
    • 전기학회논문지
    • /
    • 제65권12호
    • /
    • pp.2225-2231
    • /
    • 2016
  • In order to overcome the problem of fossil fuel energy, electric vehicle (EV) has been used in recent years. The important issues of EV are driving distance and lifetime related to EV efficiency. A voltage source converter is one of the main components of EV which can be operated with various pulse width modulation (PWM) schemes such as continuous PWM schemes and discontinuous PWM schemes. These PWM schemes will cause the effects on the efficiency of converter system and the lifetime of EV. Therefore, this paper proposes an analysis of the PWM schemes for the power converter on the EV. The objective is to find out a best solution for the EV by comparing the total harmonic distortion (THD) and transient response between the various PWM schemes. The operation of traction motor on the EV with the PWM schemes will be verified by using Psim simulation program.

2차 Space Dithered Sigma-Delta Modulation 기반의 Random PWM 스위칭 기법을 이용한 강압형 DC-DC 컨버터의 성능 개선 (Performance Improvement of a Buck Converter using a End-order Space Dithered Sigma-Delta Modulation based Random PWM Switching Scheme)

  • 김서형;주성탁;정해광;이교범;정규범
    • 전력전자학회논문지
    • /
    • 제14권1호
    • /
    • pp.54-61
    • /
    • 2009
  • 본 논문에서는 강압형 DC-DC 컨버터의 성능 개선을 위한 스위칭 기법인 2차 SDSDM (Space Dithered Sigma Delta Modulation)방식을 제안한다. PWM (Pulse Width Modulation) 방식은 일정 스위칭 주파수 대역에서의 고조파로 인해 소음, 전자파 장애, 스위칭 손실 등을 유발한다. 이러한 문제를 해결하기 위한 DSDM 방식의 일종인 1차 SDSDM은 랜덤 디더(Random Dither) 발생기가 1차 SDM의 양자화기(quatizer) 입력단에 위치하여 스위칭 주파수가 분산된다. 강압형 DC/DC 컨버터에 제안하는 2차 SDSDM의 방식을 적용한 실험 결과를 통해 타당성을 검증한다.

DC/DC 전력 컨버터의 전류모드 PWM 제어기의 방사선 영향 (Effects of the Irradiated Current Mode PWM Controller of DC/DC Power Converter)

  • 노영환;황의성;노경수;푸파논;캄푸는;한창운
    • 한국철도학회:학술대회논문집
    • /
    • 한국철도학회 2011년도 정기총회 및 추계학술대회 논문집
    • /
    • pp.685-692
    • /
    • 2011
  • DC/DC switching power converters produce DC output voltages from different DC input sources. The converters can be used in regenerative braking of DC motors to return energy back in the supply, resulting in energy savings for the systems containing frequent stops. The current mode DC/DC converter is composed of a PWM (pulse width modulation) controller, a MOSFET, and inductor, etc. Pulse width modulation is applied to control and regulate the total output voltage. It is shown that the variation of threshold voltage at MOSFET and the offset voltage increase caused by radiation effects make the PWM pulse unstable. In the PWM operation, the missing pulses, the changes in pulse width, and a change in the period of the output waveform are studied by simulation program with integrated circuit emphasis (SPICE) and experiments.

  • PDF

A Carrier-Based Pulse Width Modulation Method for Indirect Matrix Converters

  • Nguyen, Dinh-Tuyen;Lee, Hong-Hee;Chun, Tae-Won
    • Journal of Power Electronics
    • /
    • 제12권3호
    • /
    • pp.448-457
    • /
    • 2012
  • This paper proposes a carrier-based pulse width modulation (PWM) method to control an indirect matrix converter (IMC) by analyzing the relationship between the space vector PWM (SVPWM) and the carrier-based PWM. The complexity of the SVPWM method for an IMC can be reduced by using an equivalent carrier-based PWM method. The advantage of the proposed algorithm is its ability use only one symmetrical triangular carrier signal to generate the gate signals for all of the power switches in both the rectifier and inverter stages as compared to the conventional method where the carrier signal used in the rectifier stage is different from that of the inverter stage. In addition, by using a suitable offset voltage component in the modulation signals, the output voltage magnitude reaches 0.866 of the input voltage magnitude. Simulation and experimental results are provided in order to validate the proposed method.

Simplified PWM Strategy for Neutral-Point-Clamped (NPC) Three-Level Converter

  • Ye, Zongbin;Xu, Yiming;Li, Fei;Deng, Xianming;Zhang, Yuanzheng
    • Journal of Power Electronics
    • /
    • 제14권3호
    • /
    • pp.519-530
    • /
    • 2014
  • A novel simplified pulse width modulation(PWM) strategy for neutral point clamped (NPC) three-level converter is proposed in this paper.The direct output voltage modulation is applied to reduce the calculation time. Based on this strategy, several optimized control methods are proposed. The neutral point potential balancing algorithm is discussed and a fine neutral point potential balancing scheme is introduced. Moreover, the minimum pulse width compensation and switching losses reduction can be easily achieved using this modulation strategy. This strategy also gains good results even with the unequal DC link capacitor. The modulation principle is studied in detail and the validity of this simplified PWM strategy is experimentally verified in this paper. The experiment results indicated that the proposed PWM strategy has excellent performance, and the neutral point potential can be balanced well with unequal DC link captaincies.

안정된 PWM 제어 DC/DC 전력 강압 컨버터 구현 (Implementation of DC/DC Power Buck Converter Controlled by Stable PWM)

  • 노영환
    • 제어로봇시스템학회논문지
    • /
    • 제18권4호
    • /
    • pp.371-374
    • /
    • 2012
  • DC/DC switching power converters produce DC output voltages from different stable DC input sources regulated by a bi-polar transistor. The converters can be used in regenerative braking of DC motors to return energy back in the supply, resulting in energy savings for the systems containing frequent stops. The voltage mode DC/DC converter is composed of a PWM (Pulse Width Modulation) controller, a MOSFET (Metal Oxide Semiconductor Field Effect Transistor), an inductor, and capacitors, etc. PWM is applied to control and regulate the total output voltage. It is shown that the output of DC/DC converter depends on the variation of threshold voltage at MOSFET and the variation of pulse width. In the PWM operation, the missing pulses, the changes in pulse width, and a change in the period of the output waveform are studied by SPICE (Simulation Program with Integrated Circuit Emphasis) and experiments.