Title :
Uniform Models of PWM DC–DC Converters for Discontinuous Conduction Mode Considering Parasitics
Author :
Ying Qiu ; Xiyou Chen ; Chongquan Zhong ; Chen Qi
Author_Institution :
Fac. of Electron. Inf. & Electr. Eng., Dalian Univ. of Technol., Dalian, China
Abstract :
Uniform steady-state and small-signal circuit models for pulsewidth-modulated dc-dc converters operated in discontinuous conduction mode are presented. The models are developed using a new approach that accurately accounts for nonlinearity of current waveform due to component parasitic resistances. The uniform model structure for a set of dc-dc converters is transformed by substituting the practical inductor with an equivalent inductor in series connection with the output capacitor. The resulting models are used to derive the uniform expressions of voltage transfer ratio, efficiency, and various transfer functions. The proposed models can be considered as an alternative to the previously established techniques, and are shown to be fairly accurate in steady-state and small-signal representations through detailed simulations and experimental tests.
Keywords :
DC-DC power convertors; PWM power convertors; power inductors; PWM DC-DC converters; current waveform nonlinearity; discontinuous conduction mode; equivalent inductor; output capacitor; practical inductor; pulsewidth-modulated DC-DC converters; transfer functions; uniform small-signal circuit model; uniform steady-state model; voltage transfer ratio; Approximation methods; Inductors; Integrated circuit modeling; Mathematical model; Pulse width modulation; Resistance; Steady-state; Circuit average model; discontinuous conduction mode (DCM); parasitics; pulsewidth-modulated (PWM) dc??dc converter; uniform model framework;
Journal_Title :
Industrial Electronics, IEEE Transactions on
DOI :
10.1109/TIE.2014.2304911