SIMO Power Rail Converter for Current-Limited Multi-Voltage Supply
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Solution Overview
Problem
Electronic systems face challenges in accommodating multiple voltage requirements and efficiently managing power distribution across various components, especially in smaller enclosures, due to the need for multiple supply rails and varying input sources.
Innovation Solution
A unified flexible power supply system using a Single Inductor Multiple Output (SIMO) converter that provides both low and high voltage rails with a single inductor, incorporating switching devices and a power controller to regulate and alternate operating modes for efficient power distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple separate voltage conversion circuits are used to provide multiple supply rails, then each voltage rail can be independently regulated, but the device complexity and enclosure space increase
Solution Approach 1:
The patent combines multiple voltage conversion functions into a single integrated converter that can simultaneously or sequentially provide multiple supply rails (e.g., 12V, 5V, 3.3V) from a single input source. This single converter incorporates multiple switching circuits and control logic to regulate different output voltages, eliminating the need for separate dedicated converters for each rail and reducing overall system complexity.
Solution Approach 2:
The single converter design is engineered to perform multiple functions by dynamically configuring its internal switching networks. It can operate in different modes to deliver various voltage levels to different loads, and can adapt to different input sources (battery or AC adapter) through universal input stage design that works with varying voltage ranges.
2Reliability
If multiple separate voltage conversion circuits are used to provide multiple supply rails, then each voltage rail can be independently regulated, but the enclosure space increases
Solution Approach 1:
The patent combines multiple voltage conversion functions into a single integrated converter that can simultaneously or sequentially provide multiple supply rails (e.g., 12V, 5V, 3.3V) from a single input source. This single converter incorporates multiple switching circuits and control logic to regulate different output voltages, eliminating the need for separate dedicated converters for each rail and reducing overall system complexity.
Solution Approach 2:
The converter design employs nested switching networks where switching elements are arranged in hierarchical configurations. Lower-voltage switching circuits are nested within or alongside higher-voltage circuits, allowing shared use of common components such as the input capacitor, control logic, and magnetic elements across different voltage levels, thereby minimizing total component footprint.
3Device complexity
If a single inductor multiple output (SIMO) converter is used to provide multiple supply rails, then the device complexity and enclosure space are reduced, but the ability to independently regulate each voltage rail becomes challenging
Solution Approach 1:
The single converter is segmented into multiple independent control modules, each responsible for regulating a specific output voltage rail. Each module has its own feedback loop and control logic that can independently adjust switching duty cycles to maintain precise voltage regulation on each rail, even when other rails are actively drawing power or when input voltage conditions change.
Solution Approach 2:
The converter employs dynamic switching and control strategies where the operating mode and switching sequences are continuously adjusted based on real-time detection of load conditions and input voltage levels. The control system dynamically allocates power distribution among different rails and can switch between different conversion topologies (buck, boost, buck-boost) as needed to maintain optimal regulation on each rail.
4Loss of energy
If power distribution is optimized for one set of voltage requirements, then efficiency is improved for those specific loads, but adaptability to different input sources and voltage requirements decreases
Solution Approach 1:
The converter employs dynamic switching and control strategies where the operating mode and switching sequences are continuously adjusted based on real-time detection of load conditions and input voltage levels. The control system dynamically allocates power distribution among different rails and can switch between different conversion topologies (buck, boost, buck-boost) as needed to maintain optimal regulation on each rail.
Solution Approach 2:
The converter design incorporates adjustable parameters including switching frequency, duty cycle ranges, and control loop compensation that can be optimized for different operating conditions. The system detects input source characteristics (battery voltage range vs. AC adapter voltage) and automatically adjusts its operating parameters to achieve high efficiency across different input scenarios and load requirements.
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 system achieves higher efficiency and space savings by reducing the number of conversion stages, effectively managing loads with varying voltage requirements and input sources, including battery operation.
Implementation Method 1
a single inductor multiple output (SIMO) converter having a single inductor and an input that receives an input voltage from a source; a first output that delivers a low voltage derived from the input voltage and regulated by the SIMO converter; and a second output that delivers a high voltage derived from the input voltage and regulated by the SIMO converter
Data Source
AI summary
A power supply for an electronic device having a plurality of voltage rails including at least one low voltage rail and at least one high voltage rail can include a single inductor multiple output (SIMO) converter. The SIMO converter can include a single inductor; a plurality of switching devices selectively operable as switching converters for producing the plurality of regulated output voltages; and a SIMO power controller including control circuitry that selectively operates the plurality of switching devices responsive at least in part to an input voltage and the plurality of regulated output voltages. The plurality of switching devices can be arranged in a plurality of phases, and the SIMO power controller can include control circuitry for each of the plurality of phases.