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This work presents a novel mixed-signal control scheme for a boost power factor correction (PFC) rectifier. The digital controller modulates the inductor peak current to produce a low-distortion ac line current in discontinuous conduction mode (DCM) and continuous conduction mode (CCM), without the need for average current sensing. A lookup table (LUT) optimizes efficiency at low input currents, by...
In sensor-node applications, the auxiliary power is drawn from the ac mains to supply the mixed-signal sensor components. There is therefore a need for low-cost, sub-1W, miniature non-isolated ac-dc down-converters. In this work, a new two-chip architecture is proposed to implement a high-voltage quasi-resonant buck converter with peak current-mode control. The current and voltage control loops are...
Digital isolators are widely used in isolated power converters for transmitting high-frequency gating pulses. Opto-isolators generally suffer from low reliability, while emerging RF based isolators are expensive and power-hungry. In this work, two Phase-Locked-Loop (PLL) based synchronization schemes are introduced and demonstrated to operate a bidirectional Dual-Active-Bridge (DAB) dc-dc converter...
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