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High-efficiency dc/dc voltage converter including up inductive switching pre-regulator and capacitive switching post-converter

A technology of voltage converters and regulators, applied in the direction of adjusting electrical variables, control/regulation systems, output power conversion devices, etc.

Active Publication Date: 2010-02-10
ADVANCED ANALOGIC TECHNOLOGIES INCORPORATED
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage is that it can only efficiently generate an output voltage that is a predetermined multiple of the input voltage based on the number of flying capacitors used in its converter circuit
[0078] In summary, none of the existing charge pump converters, buck-boost switching regulators, and other inductive switching regulators can efficiently step up and step down a DC voltage at the same time, especially near unity (where V in ≈V out ) conversion ratio

Method used

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  • High-efficiency dc/dc voltage converter including up inductive switching pre-regulator and capacitive switching post-converter
  • High-efficiency dc/dc voltage converter including up inductive switching pre-regulator and capacitive switching post-converter
  • High-efficiency dc/dc voltage converter including up inductive switching pre-regulator and capacitive switching post-converter

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Embodiment Construction

[0166] Figure 7 It is a graphical illustration of the necessary voltage conversion ratio V of a DC / DC converter operating at various voltage outputs for an input ranging from 1.8V to 6.6V out / V in . Curve 181 illustrates that for an input range of 4.5V to 5.5V, regulating the 5V output to ±1% accuracy requires operation above or below the unity conversion ratio, which means a step-up-buck regulator converter is required Tighter tolerances than the typically guaranteed ±5% or ±10% accuracy of AC / DC wall adapters are maintained.

[0167] Another need for boost-buck conversion arises when using lithium-ion batteries to generate voltages in the middle of their wide voltage range. For example, Figure 7 Curves 182, 183, and 184 in , illustrate outputs of 4V, 3.6V, and 3.3V, respectively. Since these load voltages fall within the normal discharge voltage range of 4.2 to 3V for LiIon batteries, the converter must operate in buck mode with a voltage conversion ratio below unity...

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Abstract

A DC / DC converter includes a pre-converter stage, which may include a charge pump, and a post-regulator stage, which may include a boost converter. The duty factor of the post-regulator stage is controlled by a feedback path that extends from the output terminal of the DC / DC converter to an input terminal in the post-regulator stage. The pre-converter steps the input DC voltage up or down by a positive or negative integral or fractional value, and the post-regulator steps the voltage up by a variable amount depending on the duty factor at which the post-regulator is driven. The converter overcomes the problems of noise glitches, poor regulation, and instability, even near unity input-to-output voltage conversion ratios.

Description

[0001] Cross References to Related Applications [0002] This application claims priority to Provisional Application Nos. 60 / 877952 and 60877720, both filed December 30, 2006, each of which is hereby incorporated by reference in its entirety. technical field [0003] The present invention relates to the design, operation and performance of switching power supplies used in DC / DC conversion and voltage regulation, and to the semiconductor components used in such converters. Background technique [0004] In order to prevent changes in the power supply voltage for powering various microelectronic components such as digital ICs, semiconductor memories, display modules, hard disk drives, RF circuits, microprocessors, digital signal processors, and analog ICs, especially battery-powered Variations in applications such as cellular phones, notebook computers, and consumer products often require voltage regulation. [0005] Since the product's battery or DC input voltage typically mu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/155
Inventor 理查德·K·威廉斯
Owner ADVANCED ANALOGIC TECHNOLOGIES INCORPORATED
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