Switching Regulator Continuous Output Current via Charge Pumping
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Solution Overview
Problem
Existing switching regulators face challenges in generating supply voltages with reduced noise and improved operational reliability and efficiency, particularly in rapidly changing voltage levels and noise reduction for electronic components.
Innovation Solution
A switching regulator design incorporating an inductor, output capacitor, flying capacitor, and multiple switches operating in buck-boost or boost modes, with a controller managing the switches to charge the flying capacitor and provide a boosted voltage to the inductor, enabling continuous output delivery current and reduced noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a switching regulator uses conventional buck-boost topology, then voltage conversion is achieved, but the output current becomes discontinuous causing increased noise
Solution Approach 1:
The switching regulator is divided into multiple operational phases (first phase with first switch, second phase with second switch) that sequentially charge the inductor and transfer energy to the output. This segmentation allows continuous current flow through the inductor while enabling voltage conversion, thereby maintaining reliable operation while reducing noise from discontinuous current.
Solution Approach 2:
The first switch charges the inductor to a predetermined current level before the second switch transfers energy to the output capacitor. This preliminary charging action ensures the inductor always has stored energy ready for transfer, maintaining continuous output current and preventing the noise and reliability issues associated with discontinuous current operation.
2Productivity
If the switching regulator rapidly changes voltage levels, then performance is improved, but noise increases
Solution Approach 1:
The switching regulator operates in periodic cycles, alternating between the first phase (charging inductor through first switch) and second phase (transferring energy through second switch). This periodic operation enables rapid voltage level changes to meet performance requirements while the structured phase transitions smooth current flow, reducing noise compared to abrupt switching.
Solution Approach 2:
The inductor maintains continuous current flow throughout both phases of operation, with the first switch charging the inductor and the second switch transferring energy without interruption. This continuous useful action allows rapid voltage response for improved productivity while the smooth current transitions minimize noise generation.
3Loss of energy
If the switching regulator uses multiple switches and flying capacitor, then voltage conversion efficiency is improved, but device complexity increases
Solution Approach 1:
The flying capacitor and multiple switches serve multiple functions: the flying capacitor stores and transfers energy between phases, the first switch charges the inductor, and the second switch transfers energy to the output. This multi-functionality enables efficient voltage conversion with reduced power loss while avoiding the need for separate dedicated components for each function, thereby managing circuit complexity.
Solution Approach 2:
The switching regulator merges the voltage conversion and energy storage functions into a unified circuit topology where the inductor, flying capacitor, and switches work together in coordinated phases. This combining of functions achieves improved power efficiency through reduced losses while the integrated design manages complexity by eliminating the need for separate power conversion stages.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution achieves rapid voltage level changes with reduced noise, improved operational reliability, and miniaturized device sizes, enhancing power efficiency and performance for electronic components.
Implementation Method 1
provide a boosted voltage from the flying capacitor to the inductor in a second phase, the boosted voltage being generated by charge pumping from the input voltage
Implementation Method 2
an inductor, an output capacitor configured to generate the output voltage based on a current passing through the inductor
Data Source
AI summary
A switching regulator configured to generate an output voltage from an input voltage, includes an inductor, an output capacitor configured to generate the output voltage based on a current passing through the inductor, a flying capacitor, and a plurality of switches. The plurality of switches are configured to operate in at least one of a buck-boost mode or a boost mode to, charge the flying capacitor to the input voltage in a first phase, and provide a boosted voltage from the flying capacitor to the inductor in a second phase, the boosted voltage being generated by charge pumping from the input voltage.