Results 171 to 180 of about 20,913 (216)

A primary-switched line-side converter using zero voltage switching

Conference Record of the 2000 IEEE Industry Applications Conference. Thirty-Fifth IAS Annual Meeting and World Conference on Industrial Applications of Electrical Energy (Cat. No.00CH37129), 2001
A new primary-switched AC/DC power converter and its modulation are presented. It employs a single- or three-phase transformer, with a matrix converter (primary) and a conventional two-level converter (secondary). This allows galvanic isolation at medium-frequency zero-voltage primary commutation and five line-side voltage levels.
P.C. Kjaer, S. Norrga, S. Ostlund
openaire   +1 more source

Analysis of a Zero-Voltage Switching Converter With Two Transformers

IEEE Transactions on Circuits and Systems II: Express Briefs, 2006
This brief presents an active-clamp zero-voltage switching converter. Two transformers connected in series are used, and each transformer can be operated as an inductor or a transformer. No output inductor is needed. An active-clamp circuit is used to recycle the energy stored in the transformer leakage.
Bor-Ren Lin, Huann-Keng Chiang, Chien-Chih Chen   +2 more
openaire   +1 more source

A novel QRDCL circuit for zero voltage switched inverter

ISCAS'99. Proceedings of the 1999 IEEE International Symposium on Circuits and Systems VLSI (Cat. No.99CH36349), 2003
This paper presents an alternate quasi-resonant dc link (QRDCL) circuit for soft switched inverters which does not require paralleling of a charged capacitor with another charged capacitor or a voltage source. The circuit momentarily pulls down the DC link voltage to zero as commanded by the control circuit to facilitate zero voltage switching (ZVS) of
BAGEWADI, MD, FERNANDES, BG, SUBRAHMANYAM, RVS   +2 more
openaire   +2 more sources

Single-switch DC-DC converter with zero-voltage-switching and clamped voltage

Proceedings of IEEE Power Electronics Specialist Conference - PESC '93, 2002
Single-switch DC-DC power converters with zero-voltage-switching and clamped voltage (ZVS-CV) are presented. To construct such converters, a switch cell, which consists of the basic PWM (pulse-width modulation) switch cell and an additional commutation inductor circuit, is proposed.
T. Mizoguchi, T. Ninomiya, T. Ohgai, K. Harada   +3 more
openaire   +1 more source

A comparative study of switching losses of IGBTs under hard-switching, zero-voltage-switching and zero-current-switching

Proceedings of 1994 Power Electronics Specialist Conference - PESC'94, 2002
A high power IGBT tester, based on the typical clamped inductive load circuit and incorporating zero-voltage-transition and zero-current-transition soft-switching schemes, has been developed. Both turn-on losses, including the losses associated with reverse recovery of the clamp (free-wheeling) diode, and turn-off losses are measured and compared for ...
null Konrong Wang, F.C. Lee, null Guichao Hua, D. Borojevic   +3 more
openaire   +1 more source

An improved full-bridge zero-voltage-transition PWM DC/DC converter with zero-voltage/zero-current switching of the auxiliary switches

IEEE Transactions on Industry Applications, 2000
In this paper, a novel full-bridge (FB) zero-voltage-transition (ZVT) pulsewidth modulation (PWM) DC/DC converter topology is proposed. The proposed FB-ZVT PWM DC/DC converter has zero-voltage switching (ZVS) of main switches for the entire line and load range and an advantage of achieving ZVS and zero-current switching of the auxiliary switches using ...
null Dong-Yun Lee, null Byoung-Kuk Lee, null Sang-Bong Yoo, null Dong-Seok Hyun   +3 more
openaire   +1 more source

An improved full-bridge zero-voltage-transition PWM DC/DC converter with zero-voltage/zero-current switching of the auxiliary switches

APEC '98 Thirteenth Annual Applied Power Electronics Conference and Exposition, 2002
In this paper, an improved full-bridge (FB) zero-voltage-transition (ZVT) PWM DC/DC power converter topology is proposed. The proposed FB-ZVT PWM DC/DC power converter has the advantage of achieving zero voltage and zero current switching of the auxiliary switches using an auxiliary network.
null Dong-Yun Lee, null Byoung-Kuk Lee, null Dong-Seok Hyun   +2 more
openaire   +1 more source

A novel full-bridge zero-voltage-transition PWM DC/DC converter with zero-voltage/zero-current switching of the auxiliary switches

PESC 98 Record. 29th Annual IEEE Power Electronics Specialists Conference (Cat. No.98CH36196), 2002
In this paper, a novel full-bridge (FB) zero-voltage-transition (ZVT) PWM DC/DC converter topology is proposed. The proposed FB-ZVT PWM DC/DC converter has ZVS of main switches for wide load and line ranges and an advantage of achieving zero voltage and zero current switching of the auxiliary switches using the auxiliary network.
null Dong-Yun Lee, null Byoung-Kuk Lee, null Dong-Seok Hyun   +2 more
openaire   +1 more source

Zero-current zero-voltage switching for on-load tap changers

5th IET International Conference on Power Electronics, Machines and Drives (PEMD 2010), 2010
We present a new on-load tap changer (OLTC) design that provides the traditional advantages of the semiconductor-assisted OLTC over the classic, mechanical OLTC. The design provides zero-current, zero-voltage operation of both diverter switches at all times, eliminating contact wear due to arcing.
D.J. Rogers, T.C. Green
openaire   +1 more source

Zero-voltage and zero-current soft-switching PWM inverter

2005 European Conference on Power Electronics and Applications, 2005
This paper presents a zero-voltage and zero-current soft-switching (ZVZCS) PWM three phase inverter with a single auxiliary resonant commutation cell. All of the main switches in the three-phase inverter side can be turned on and turned off under zero-voltage and zero-current condition. The operating principle of proposed commutation cell is described,
E. Hiraki, T. Tanaka, M. Nakaoka
openaire   +1 more source