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In our earlier work, we showed that the discrete-time model of a dc-dc converter governed by a pulse skipping modulation (PSM), could be modeled as a discontinuous map, comprising either 1-D functions only or a combination of 1-D and 2-D functions. In this paper, we show that the entire map can be restricted to one dimension for a wide range of parameters. As a parameter is varied, the periodicity...
The paper demonstrates, both numerically and experimentally, the quasiperiodic and subharmonic operation in a load resonant DC-DC converter. The output voltage of the converter is controlled by a closed loop, applying constant-frequency pulse width modulation. The complexity of the system is contributed by fact that the state space is five-dimensional, with four switching surfaces dividing it into...
This paper demonstrates how load regulation can be improved in a current controlled tri-state boost converter along with the elimination of the right-half-plane (RHP) zero. Although use of a PI controller improves regulation, it degrades the dynamic performance, and a higher integral gain results in a considerably reduced phase margin. The objective of this paper is to investigate an alternative method...
This paper presents the concept of a voltage controlled pulse skipping modulation (VCPSM) in a dc-dc converter, which improves the efficiency, ripple magnitude, and transient response over a wide range of light load condition. The duty ratio of VCPSM, instead of remaining constant as in a classical PSM, is controlled using the voltage mode control with an additional input voltage feed-forward along...
Novel controllers to improve the stability of coupled interleaved buck converters operating under current-mode control are proposed in this paper. The controllers are employed to force the eigenvalues of the monodromy matrix of the system (the state transition matrix over one full cycle) inside the unit circle, thus avoiding the Neimark bifurcation which has been known to occur in this system. The...
The technique to model DC-DC converters governed by pulse skipping modulation (PSM), which is based on energy balance principle, is not accurate enough. In this paper, an attempt has been made to model them accurately using the discrete-time modeling approach. PSM scheme is essential to improve the efficiency of a DC-DC converter during the light load condition, mainly during standby or sleep mode...
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