Abstract
This paper proposes a simple, hardware-efficient digital pulse width modulator for a 4SBB that enables operation in Buck, Boost, and Buck+Boost modes, achieving smooth transitions between the different modes. The proposed modulator is simulated using Simulink and experimentally demonstrated using a 500 W 4SBB converter with 24 V input voltage and 12–36 V output voltage range.
Highlights
Cascaded Buck-Boost converters are being extensively used in a variety of applicaCascaded Buck-Boost converters are being extensively used in a variety of applications.tions
Two-switch cascaded Buck-Boost converters were first proposed as Power Factor Correction
This paper addresses the issue of adequately generating those signals in the 4SBB converter focusing on the Buck+Boost mode operation and the transitions between modes
Summary
Cascaded Buck-Boost converters are being extensively used in a variety of applicaCascaded Buck-Boost converters are being extensively used in a variety of applications. The operation of the 4SBB converter in Buck+Boost mode used in [7] has proven to be the most adequate approach to achieve simple and efficient near-unity conversion ratios. This approach requires generating two distinct duty cycles to control each pair of switches from the control signal d[n]. Pulse-Width Modulator (DPWM) for a 4SBB converter that automatically enables full-range conversion ratios; the converter operates in the three modes (Buck, Boost, and Buck+Boost) depending on the required conversion ratio, generating the necessary control signals for all switches in each mode and achieving smooth transitions between the different modes. The paper is organized as follows: Section 2 describes the operation of the 4SBB converter with near-unity conversion ratios and unveils the problem that arises in such condition; Section 3 describes the operation principles and a simple FPGA-based implementation of the proposed smooth-transition DPWM; Section 4 shows simulation and experimental results; and Section 5 concludes the paper
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