Title :
A unified design criterion for ZVT DC-DC PWM converters with constant auxiliary Voltage source
Author :
Russi, Jumar Líuis ; Martins, M.Ld.S. ; Grundling, Hilton A. ; Pinheiro, Humberto ; Pinheiro, Josée Renes ; Hey, Héelio Leäaes
Author_Institution :
Power Electron. & Control Res. Group, Fed. Univ. of Santa Maria, Brazil
Abstract :
This paper proposes a design criterion for calculating the resonant auxiliary elements of zero-voltage transition dc-dc pulsewidth-modulated (PWM) converters that use a dc auxiliary voltage source. The proposed criterion is based on stored energy in resonant auxiliary elements and takes into account the influence of the auxiliary voltage source value. Using this criterion, the reactive energy can be kept at a minimum level and a reduction of the auxiliary elements current ratings is achieved, which leads to lower conduction losses and improved converter efficiency. In addition, a reduction in size of auxiliary magnetic elements can be accomplished. To illustrate the usefulness of the proposed design criterion, the paper compares results obtained from the True-PWM Zero-Voltage Switching pole boost converter designed according to the proposed criterion, and from the original design guidelines. Experimental results show an efficiency gain of about 1% for a wide load range and 1.5% at full load. In addition, a reduction of about 52% in the auxiliary transformer volume for the implemented prototype was achieved, ensuring a reduction in overall converter size. Experimental results were obtained using a 1-kW 100-kHz laboratory prototype.
Keywords :
DC-DC power convertors; PWM power convertors; energy storage; losses; switching convertors; transformers; zero voltage switching; 1 kW; 100 kHz; DC-DC PWM converter; ZVT; auxiliary transformer; auxiliary voltage source; boost converter; conduction losses; current rating; energy storage; reactive energy; resonant auxiliary element; switching circuit; unified design criterion; zero-voltage switching; zero-voltage transition; Guidelines; Laboratories; Magnetic resonance; Prototypes; Pulse transformers; Pulse width modulation; Pulse width modulation converters; Stress; Switching converters; Zero voltage switching; DC–DC power conversion; pulsewidth-modulated (PWM) power converters; switching circuits;
Journal_Title :
Industrial Electronics, IEEE Transactions on
DOI :
10.1109/TIE.2005.855666