Advanced Multiphasing Switched-Capacitor DC-DC Converters


Book Description

This book gives a detailed analysis of switched-capacitor DC-DC converters that are entirely integrated on a single chip and establishes that these converters are mainly limited by the large parasitic coupling, the low capacitor energy density, and the fact that switched-capacitor converter topologies only have a fixed voltage conversion ratio. The authors introduce the concept of Advanced Multiphasing as a way to circumvent these limitations by having multiple out-of-phase parallel converter cores interact with each other to minimize capacitor charging losses, leading to several techniques that demonstrate record efficiency and power-density, and even a fundamentally new type of switched-capacitor topology that has a continuously-scalable conversion ratio. Provides single-source reference to the recently-developed Advanced Multiphasing concept; Enables greatly improved performance and capabilities in fully integrated switched-capacitor converters; Enables readers to design DC-DC converters, where multiple converter cores are put in parallel and actively interact with each other over several phases to improve their capabilities.













Design and Implementation of Fully-Integrated Inductive DC-DC Converters in Standard CMOS


Book Description

CMOS DC-DC Converters aims to provide a comprehensive dissertation on the matter of monolithic inductive Direct-Current to Direct-Current (DC-DC) converters. For this purpose seven chapters are defined which will allow the designer to gain specific knowledge on the design and implementation of monolithic inductive DC-DC converters, starting from the very basics.




Integrated Hybrid Resonant DCDC Converters


Book Description

This book provides a comprehensive, single-source on resonant switched-capacitor converters. It is written in the style of a handbook, with systematic guidelines, and includes implementation examples. The authors explore integrated hybrid resonant DCDC converters in order to achieve highly compact, energy efficient and cost-effective power management solutions in the growing fields of wearables and internet-of-things applications. They provide an introduction into hybrid converters as a new and promising converter class, which merges capacitive and inductive conversion concepts into one. Coverage ranges from fundamentals to implementation details, including topics such as power stage design, gate drive schemes, different control mechanisms for resonant operation and integrated passives. Introduces a new, multi-ratio resonant converter architecture, which enables lower switching frequencies and better passive component utilization; Discusses circuit block design for high efficiency of the power stage; Explores implementation details and concepts for integrated passives; Derives models, implements and compares to each other different control mechanisms.




High-Ratio Voltage Conversion in CMOS for Efficient Mains-Connected Standby


Book Description

This book describes synergetic innovation opportunities offered by combining the field of power conversion with the field of integrated circuit (IC) design. The authors demonstrate how integrating circuits enables increased operation frequency, which can be exploited in power converters to reduce drastically the size of the discrete passive components. The authors introduce multiple power converter circuits, which are very compact as result of their high level of integration. First, the limits of high-power-density low-voltage monolithic switched-capacitor DC-DC conversion are investigated to enable on-chip power granularization. AC-DC conversion from the mains to a low voltage DC is discussed, enabling an efficient and compact, lower-power auxiliary power supply to take over the power delivery during the standby mode of mains-connected appliances, allowing the main power converter of these devices to be shut down fully.




Analytical Modeling and Design of High Efficiency Fully-integrated Switched-capacitor DC-DC Converters and a High-voltage Current Regulator


Book Description

A high-voltage micro-ampere current regulator is introduced that ensures a constant ion current in order to stabilize measurements in analytical ion instruments. The current regulator is placed in series with a high-voltage power supply and a corona discharge ionization source. The proposed current regulator stabilizes the current in the corona without requiring a portion of the corona ion current sampled. The current regulator includes a first feedback circuit to provide rapidly-adapting current regulation, and an optional secondary feedback which provide slowly-adapting current regulation. The secondary feedback circuit senses the voltage across the high-voltage current regulator and slowly varies a high-voltage power supply to improve the long-term stability. Measured results demonstrate 10 kV of isolation and an adjustable current range from 1 to 50 [mu]A.




Design of a Multi-Module and Fully Integrated Switched-Capacitor DC-DC Power Converter


Book Description

[ANGLÈS] DC-DC converters are one of the main components of a power management unit and, concretely, the Switched-Capacitor DC-DC Power Converters (SCPC) are recently used due to their high efficiency and the possibility of being fully integrated. In this thesis, it is designed a SCPC converter in a 140 nm technology with the objective of replace a low frequency continuous-time regulator. With an input voltage of 20 V, the SCPC converter designed achieve an output voltage of 3.3 V and an output current of 5 mA with a 68.78% of efficiency. Different optimization and minimization methods have been developed in order to reduce the losses of the converter and accomplish the specifications. A multi-module structure is implemented with the objective of reducing the total area. Also, it is designed a control loop to provide robustness and load regulation in front of process and temperature variations.