Giovanni Garcea

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This paper investigates an energy-based approach for the prediction of limit-cycle oscillations (LCOs) in digitally controlled dc-dc converters due to quantization effects on the A/D converters and digital pulse-width modulator (DPWM). Existing static and dynamic models predict the existence of only a part of limit cycle oscillations, so that extensive(More)
This paper investigates the application of a mixed-signal synchronous/asynchronous digital controller to DC-DC boost converters. The digital control synchronously generates current and voltage ramps by using two low-resolution digital-to-analog converters. The switch turn-on and turn-off are determined asynchronously by comparing the converter-state(More)
Digitally controlled DC-DC converters are affected by quantization effects on A/D converters and digital pulse-width modulators (DPWMs) which may result in undesirable limit-cycle oscillations. Existing static and dynamic models predict the existence of only a small part of limit cycle oscillations, so that extensive time-domain simulations are usually(More)
Inductor current sensing is becoming widely used in current programmed controllers for microprocessor applications. This method exploits a low-pass filter in parallel with the inductor to provide lossless current sense. A major drawback of inductor current sensing is that accurate sense the DC and AC components of the current signal requires precise(More)
This paper investigates a mixed synchronous/asynchronous digital voltage-mode controller for dc-dc converters. In the proposed control architecture, the turn-on switching event is determined asynchronously by comparing the converter output voltage and a synchronously generated voltage ramp driven by the digital control using a low-resolution(More)
This paper investigates the application of a mixed synchronous/asynchronous digital controller to DC-DC boost converters. The digital control synchronously generates current and voltage ramps by using two low-resolution digital-to-analog converters (DACs). Switch turn-on and turn-off are determined asynchronously by comparing converter state variables and(More)
This paper proposes a mixed-signal control for Voltage Regulated Modules (VRMs), which is based on a digital voltage loop and a peak-modulator digitally controlled by a low-resolution digital-to-analog converter (DAC). Improvement in the dynamic response and elimination of static quantization effects are obtained performing the peak-modulation on a weighted(More)
This paper investigates power line communication in digitally-controlled dc-dc converters. Communication between different dc-dc converters is obtained detecting the switching signal on the common bus voltage and using switching frequency modulation. Each converter operates at three different switching frequencies, the first associated to bit 1(More)
In this paper, an alternative formulation of the NS-FEM based on an assumed stress field is presented to include drilling rotations. Within each triangular element the displacement field is described by a revised Allman triangle interpolation, while the stress field is assumed as linear or linear reduced on the conflict domain of the background grid. The(More)
A mixed synchronous/asynchronous digital controller for high performance DC-DC converters is presented. The control architecture is quite simple, being based on the use of two digital-to-analog (DAC) converters with low resolution (7 bits). A new control algorithm exploits digitally generated current and voltage ramps in order to completely suppress(More)
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