Luca Corradini

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This paper addresses auto-tuning of digital controllers for point-of-load (POL) switching converters with wide range of capacitive loads. Two auto-tuning methods are considered with particular attention given to robustness and feasibility. The first method is derived from the well known relay-feedback autotuning technique, where specific frequencies are(More)
This paper addresses the design and practical implementation of a digital controller for switched-mode DCDC converters with self-tuning capabilities. The proposed tuning technique is based on digital relay feedback and exhibits some features specifically developed to improve accuracy and robustness in practical applications. The most relevant property is(More)
This paper investigates the multisampling techniques applied to the current control in active-power-filter (APF) applications. In APF applications with digital control, the main bandwidth limitation derives from A/D conversion and computational delays and the sampling-related delay of the digital pulsewidth modulation (DPWM). Using field-programmable gate(More)
This paper analyzes the general problem of inductor current limitation in the time-optimal load transient response of a DC-DC buck converter. The concept of currentlimited, time-optimal control (CL-TOC) is introduced and compared to the previously reported unconstrained timeoptimal solutions. A fundamental tradeoff between maximum allowed current overshoot(More)
Energy Harvesting Wireless Sensor Devices are increasingly being considered for deployment in sensor networks, due to their demonstrated advantages of prolonged lifetime and autonomous operation. However, irreversible degradation mechanisms jeopardize battery lifetime, calling for intelligent management policies, which minimize the impact of these phenomena(More)
This paper focuses on the non-inverting buckboost converter supplying an adjustable DC voltage to a WCDMA RF power amplifier (RFPA) in order to improve the system efficiency under different transmitted RF power levels. It is shown that precise output voltage positioning and low output voltage ripple over a wide output voltage range, including buck, boost(More)
This paper presents an alternative modulation approach for digitally controlled DC-DC switching converters, which exploits the natural jittering activity of a digital hysteretic feedback loop in order to provide an effective increase in resolution. The proposed structure replaces conventional highresolution digital pulse-width modulators (DPWM) or(More)
Harvesting-Based Wireless Sensor Devices are increasingly being deployed in today’s sensor networks, due to their demonstrated advantages in terms of prolonged lifetime and autonomous operation. However, irreversible degradation mechanisms jeopardize battery lifetime, calling for intelligent management policies, which minimize the impact of these phenomena(More)
This paper presents an approach to continuous adaptive tuning of digitally controlled switched-mode power supply (SMPS) feedback loops. Tuning is performed via a multiple-input, multiple-output (MIMO) control loop that adjusts compensator parameters such that crossover frequency and phase margin measured by the digital controller match desired values. A(More)