• Title, Summary, Keyword: Zero voltage switching

Search Result 819, Processing Time 0.071 seconds

Implement of Constant-Frequency-Controled Zero-Voltage-Switching Converter-fed DC Motor Drive for Low Power Loss (직류 전동기의 저손실 구동을 위한 일정 주파수 제어형 영전압 스위칭 변환기의 구현)

  • Ko, Moon-Ju;Park, Jin-Hong;Han, Wan-Ok;Lee, Sung-Paik
    • Proceedings of the KIEE Conference
    • /
    • /
    • pp.2148-2150
    • /
    • 1998
  • This paper proposes a constant frequency controlled zero voltage switching method that can reduce switching losses caused by emf on inductance in DC motor. The zero voltage switching method is used more than a zero current switching method because of reducing switching losses by capacitance of depletion region of MOSFET. To simplify the controller circuit, we propose constant frequency controlled zero voltage switching method in the paper. The control method is more stable than a variable frequency control method because it can optimize bandwidth of a closed-loop and reactances. Therefore, we construct a constant frequency controlled zero voltage switching converter and improve zero switching losses in high switching frequency. In the process, we can control low-losses in full range on variable voltage and load. We simulate the proposed converter with P-SPICE and compare results obtained through the experiment.

  • PDF

A High Efficiency Zero Voltage/Zero Current Transition Converter for Series Connected Battery Cell Equalization (영전압/영전류 스위칭을 이용한 고효율의 직렬 접속 배터리 전압 밸런싱 방법)

  • Kim, Tae-hoon;Park, Nam-Ju;Hyun, Dong-seok;Kim, Rae-young
    • Proceedings of the KIPE Conference
    • /
    • /
    • pp.26-27
    • /
    • 2011
  • This paper focuses on the zero-voltage/zero current transition voltage equalization circuit for the series connected battery cell. By adding auxiliary resonant cells at the main switching devices such as MOSFET or IGBT, zero current switching is achieved and turned off loss of switching elements is eliminated and by the voltage/second balancing of the inductor, zero voltage switching can be applied to switching element. Transformer coupling between battery cells and ZVZCT (Zero Voltage Zero Current Transition) switching method allow the fast balancing speed and high frequency operation, which reduces the size and weight of the circuit. The validity of the battery equalization is further verified using simulation involving four lithium-ion battery cell models.

  • PDF

New Zero-Current-Transition (ZCT) Circuit Cell Without Additional Current Stress

  • Kim Chong-Eun;Choi Eun-Suk;Youn Myung-Joong;Moon Gun-Woo
    • Proceedings of the KIPE Conference
    • /
    • /
    • pp.294-298
    • /
    • 2003
  • In this paper, the new zero-current-transition (ZCT) circuit cell is proposed. The main switch is turned-off under the zero current and zero voltage condition, and there is no additional current stress and voltage stress in, the main switch and the main diode. The Auxiliary switch is turned-off under the zero voltage condition, and the main diode is turned-on under the zero voltage condition, The resonant current required to obtain the ZCT is small and regenerated to the input voltage source. The operational principles of the boost converter integrated with the proposed ZCT circuit cell is analyzed theoretically and verified by the simulation and experimental result. Index terms - zero-current-transition (ZCT), zero-current- switching (ZCS), zero-voltage-switching (ZVS)

  • PDF

Optimal Zero Vector Selecting Method to Reduce Switching Loss on Model Predictive Control of VSI (전압원 인버터의 모델 예측 제어에서 스위칭 손실을 줄이기 위한 최적의 제로 벡터 선택 방법)

  • Park, Jun-Cheol;Park, Chan-Bae;Baek, Jei-Hoon;Kwak, Sang-Shin
    • The Transactions of the Korean Institute of Power Electronics
    • /
    • v.20 no.3
    • /
    • pp.273-279
    • /
    • 2015
  • A zero vector selection method to reduce switching losses for model predictive control (MPC) of voltage source inverter is proposed. A conventional MPC of voltage source inverter has not been proposed, and a method to select the redundancy of the zero vector is required for this study. In this paper, the redundancy of the zero vectors is selected with generating a zero sequence voltage to reduce switching losses. The zero vector of 2-level inverter is determined by determining sign of the zero sequence voltage. In the proposed method, the quality of the current is retained and switching loss can be reduced compared with the conventional method. This result was verified by P-sim simulation and experiments.

Zero voltage and zero current switched converters (영전압 영전류 스위칭 방식의 컨버터)

  • 정규범
    • Proceedings of the Korean Institute of IIIuminating and Electrical Installation Engineers Conference
    • /
    • /
    • pp.120-124
    • /
    • 1998
  • In this paper, new zero voltage and zero current switched PWM(Pulse Width Modulated) converters are suggested. The main and auxiliary switch of the converters satisfy soft switching conditions, which are zero voltage or zero current switching of the switches. The switching characteristics of the proposed converters are experimentally verified by boost typed converter, which has 250 kHz switching frequency. For the 250 kHz operation, turn on period of auxiliary switch is about 1/40 for switching period of 4 ${\mu}\textrm{s}$. Therefore, the conduction loss of auxiliary switch is reduced.

  • PDF

A Family of Magnetic Coupling DC-DC Converters With Zero-Voltage-Switching Over Wide Input Voltage Range and Load Variation

  • Chen, Guipeng;Dong, Jie;Deng, Yan;Tao, Yong;He, Xiangning;Wang, Yousheng
    • Journal of Power Electronics
    • /
    • v.16 no.5
    • /
    • pp.1639-1649
    • /
    • 2016
  • This paper presents a family of soft-switching DC-DC converters with a simple auxiliary circuit consisting of a coupled winding and a pair of auxiliary switch and diode. The auxiliary circuit is activated in a short interval and thus the circulating conduction losses are small. With the auxiliary circuit, zero-voltage-switching (ZVS) and zero-current-switching are achieved for the main and auxiliary switches respectively, over wide input voltage range and load variation. In addition, the reverse-recovery problem of diodes is significantly alleviated because of the leakage inductor. Furthermore, the coupled inductor simultaneously serves as the main and auxiliary inductors, contributing to reduced magnetic component in comparison with the conventional zero-voltage-transition (ZVT) converters. Experimental results based on a 500 W prototype buck circuit validate the advantages and effectiveness of the proposed magnetic coupling ZVS converter.

A Novel Soft Switching PWM·PFC AC·DC Boost Converter

  • Sahin, Yakup
    • Journal of Electrical Engineering and Technology
    • /
    • v.13 no.1
    • /
    • pp.256-262
    • /
    • 2018
  • This study introduces a novel Soft Switching (SS) Pulse Width Modulated (PWM) AC-DC boost converter. In the proposed converter, the main switch is turned on with Zero Voltage Transition (ZVT) and turned off with Zero Current Transition (ZCT). The main diode is turned on with Zero Voltage Switching (ZVS) and turned off with Zero Current Switching (ZCS). The auxiliary switch is turned on and off with ZCS. All auxiliary semiconductor devices are turned on and off with SS. There is no extra current or voltage stress on the main semiconductor devices. The majority of switching energies are transferred to the output by auxiliary transformer. Thus, the current stress of auxiliary switch is significantly reduced. Besides, the proposed converter has simple structure and ease of control due to common ground. The theoretical analysis of the proposed converter is verified by a prototype with 100 kHz switching frequency and 500 W output power. Furthermore, the efficiency of the proposed converter is 98.9% at nominal output power.

Design of the High Frequency Resonant Inverter for Corona Surface Processes

  • Choi, Chul-Yong;Lee, Dae-Sik
    • Proceedings of the Korea Society of Information Technology Applications Conference
    • /
    • /
    • pp.119-122
    • /
    • 2005
  • A algorithm for control and performance of a pulse-density-modulated (PDM) series-resonant voltage source inverter developed for corona-dischange precesses is presented. The PDM inverter produces either a square-wave ac-voltage state or a zero-voltage state at its ac terminals to control the average output voltage under constant dc voltage and operating frequency. Moreover it can achieve zero-current-switching (ZCS) and zero-voltage-switching (ZVS) in all the operating condition for a reduction of switching lost. Even though the corona discharge load with a strong nonlinear characteristics, new high frequency resonant inverter is shown the wide range power control from 5% to 100%.

  • PDF

Active Controlled Primary Current Cutting-Off ZVZCS PWM Three-Level DC-DC Converter

  • Shi, Yong
    • Journal of Power Electronics
    • /
    • v.18 no.2
    • /
    • pp.375-382
    • /
    • 2018
  • A novel active controlled primary current cutting-off zero-voltage and zero-current switching (ZVZCS) PWM three-level dc-dc converter (TLC) is proposed in this paper. The proposed converter has some attractive advantages. The OFF voltage on the primary switches is only Vin/2 due to the series connected structure. The leading-leg switches can obtain zero-voltage switching (ZVS), and the lagging-leg switches can achieve zero-current switching (ZCS) in a wide load range. Two MOSFETs, referred to as cutting-off MOSFETs, with an ultra-low on-state resistance are used as active controlled primary current cutting-off components, and the added conduction loss can be neglected. The added MOSFETs are switched ON and OFF with ZCS that is irrelevant to the load current. Thus, the auxiliary switching loss can be significantly minimized. In addition, these MOSFETs are not series connected in the circuit loop of the dc input bus bar and the primary switches, which results in a low parasitic inductance. The operation principle and some relevant analyses are provided, and a 6-kW laboratory prototype is built to verify the proposed converter.

A Family of Zero Current and Zero Voltage Switching Bidirectional DC-DC Converter with Soft Switched Auxiliary Circuit (소프트 스위칭 방식의 보조 회로를 갖는 영전류 및 영전압 스위칭 양방향 DC-DC 컨버터)

  • Lee, Il-Ho;Kim, Jun-Gu;Kim, Jae-Hyung;Won, Chung-Yuen;Jung, Yong-Chae
    • Proceedings of the KIPE Conference
    • /
    • /
    • pp.438-439
    • /
    • 2011
  • In this paper, soft switching bidirectional DC-DC converter is proposed. The proposed topology is added two auxiliary switches, two resonant capacitors and one resonant inductor to convectional bidirectional DC-DC converter. Therefore, this proposed topology can reduce switching loss of each power switch by ZVS (Zero Voltage Switching) and ZCS (Zero Current Switching). We have performed mode analysis, simulation and experiment for the proposed topology.

  • PDF