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Because of bi-frequency (BF) control technology for continuous conduction mode (CCM) switching DC-DC converter appearing low-frequency oscillation phenomenon, so that bi-frequency control technology is just used in discontinuous conduction mode (DCM) and the improvement of output power is limited. In this paper, bi-frequency control technology for pseudo continuous conduction mode (PCCM) switching...
After dimension reduction, the boundary voltage of valley V2 controlled buck converter is deduced under different operation states. Based on it, the equivalent one-dimensional discrete-time model is established and complex nonlinear behaviors are emphatically studied in this paper. The stability and bifurcation property are analyzed in detail. The research results show that valley V2 controlled buck...
By analyzing the traction technologies used in existing locomotives and high speed trains, the development and current situation of traction technology were described, and some urgent problems which need to be solved were presented. Firstly DC motor traction technologies used in Chinese railway were introduced, the development process of DC to AC motor traction locomotives were summarized. Secondly...
Input current distortion is a common phenomenon when the input voltage is at the zero-crossing in power factor correction (PFC) converters. This paper analyzes the cause of zero-crossing distortion and indicates that input current leading the input voltage is the key reason for non-unity fundamental displacement factor and the zero-crossing distortion in boost PFC converter. The zero-crossing distorted...
A new control technique, peak inductor current and differential-mode voltage control technique, for non-isolated single-inductor multiple-output (SIMO) buck converters is investigated in this paper. The proposed control method can realize independent control of different output of the SIMO converters operating in continuous conduction mode (CCM) to reduce cross-regulation effect. By taking a three...
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