Dynamic Properties of PCM-Controlled Superbuck Converter – Discrete vs. Coupled Inductor Implementation

Issues on Interfacing Problematics in PV Generator and MPP-Tracking Converters

“…If the conduction time of the high-side switch is, however, decreased, the desired effect will be obtained. Similar effect can be obtained by inversing the switch control signals (Leppäaho, et al, 2010) or using a descending PWM ramp signal.…”

“…This fact is not usually recognized but the input capacitor is assumed not to contribute to the dynamic processes inside the converter. Leppäaho, et al, 2010, have definitively shown that the converter contains a right-half-plane (RHP) zero and duty-ratio-dependent resonant behaviour (i.e., second-order dynamics) in its output control dynamics, which are not present in the original buck converter when its output is terminated with a constant-voltage type load. The PV generator removes the RHP zero and the resonant behaviour when the operating point moves to the constant-voltage region.…”

“…19 and supplied by Raloss SR30-36 panel discussed earlier in Section 2. The more detailed information on the converters can be found from (Huusari, et al, 2010;Leppäaho, et al, 2010). The same frequency response analyzer as in Section 2 is used to extract the frequency responses shown below.…”

“…A CF converter can be implemented in three distinct ways such as i) constructing intuitively the converter based on the application of capacitive switched cells (Shmilovitz, 2006), ii) from a VF converter applying duality-transformation methods (Ćuk, 1979), and iii) adding a capacitor at the input terminal of a VF conventional (Leppäaho, et al, 2010). The first method produces a converter with the desired feature defined by the designer.…”