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This paper presents stability analysis of a buck converter based on an LPV (linear parameter-varying) approach. Theoretical stability analysis of DC-DC converters is not so easy especially with wide variations of input voltage and load. Authors propose a theoretical method that can be used by converter designers. A nonlinear model of buck converter is proposed to achieve stability analysis. The main...
The control of power converters can be difficult if high dynamic performance is required, especially against the variations in supply voltage and load. This difficulty can further increase in the presence of input filters, which are intentionally underdamped to decrease the converter losses. In such cases, the peak current mode control facilities the design of control law. The usual approach for the...
LC filters at the input of dc-dc converters can lead to instabilities due to filter interactions with the converter control. Conventional methods to remedy this issue usually employ external resistors to damp filter oscillations. However such dissipative damping of input filter degrades the converter efficiency. In this paper we propose an alternate solution to this problem using a full state-feedback...
Many applications of switch-mode dc-dc converters require high conversion ratios (Vout/Vin), thus encouraging the use of n-stages connected in cascade. However, when an input filter is added to an existing cascade converter ldquoblack boxrdquo, it can cause system instability and performance degradation due to the negative dynamic input resistance characteristic of the converter. In this paper, we...
An input filter is often employed for EMI noise reduction between a dc-dc converter and its power source. However, its presence, in turn, often results in degradation of dynamic performance and instability of the system even if the filter attenuation is brilliantly designed. The detrimental interaction between an input filter and a switched mode converter is a function of the input filter parameters...
Electronic power converters are sources of electromagnetic interference at their input power source as well as in other neighbouring electronic equipment, and suppression of EMI is a major issue in switch-mode power converter design. By their very nature, switching converters have fast voltage and current changes that generate conducted noise due to reflected ripples in the input current. Fast switching...
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