単相高力率昇圧形AC-DCコンバ-タの特性解析

概要

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This paper presents analysises of high power factor AC-DC converter with a boost converter operating in discontinuous conduction mode (DCM) and critical conduction mode (CRM). The converter can be expressed by a nonlinear differential equation for each mode. The equation in DCM is solved analytically by separating its variable (output voltage) into two terms of a ripple component and a direct component, and by linearizing the equation for the ripple component. On the other hand, the equation in CRM can be solved analytically. Furthermore, the source current waveform of the converter is expanded into the Fourier series. As the results, the output voltage, its ripple and the power factor of the converter in DCM and CRM are derived as a function of the circuit parameters respectivelly, and verified experimentally. These equations exhibit clearly the effect of each circuit parameter of the converter and the difference between the converter in DCM and in CRM. The converter operating in CRM produces sinusoidal ac current with unity power factor.
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