SIMO Voltage Converter Control Without Multiple Op-Amps
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Solution Overview
Problem
Conventional single-inductor multiple-output (SIMO) voltage converters require multiple operational amplifiers, leading to high power consumption, making them unsuitable for low-power applications due to excessive bandwidth demand.
Innovation Solution
A single-inductor multiple-output voltage converter design that utilizes an energy generation circuit, energy distribution circuit, peak-inductor-current detection circuit, zero-inductor-current detection circuit, and control logic circuit to provide multiple output voltages without multiple operational amplifiers, reducing power consumption by avoiding excessive bandwidth demand.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If multiple operational amplifiers are used in SIMO voltage converters, then the loop transient response capability is improved, but the power consumption increases
Solution Approach 1:
The patent merges the control functions of multiple operational amplifiers into a single operational amplifier by using a priority encoder to consolidate multiple output voltage feedback signals into one error amplification channel, thereby reducing power consumption while maintaining transient response capability
Solution Approach 2:
The single operational amplifier is designed to handle multiple output voltage regulation tasks simultaneously through the priority encoder mechanism, making it a universal control element that replaces multiple dedicated operational amplifiers
2Measurement precision
If multiple operational amplifiers are used in SIMO voltage converters, then the control precision of multiple output channels is improved, but the device complexity increases
Solution Approach 1:
Multiple output voltage feedback signals are merged into a single error amplification channel through the priority encoder, reducing the number of operational amplifiers from multiple to one, thereby simplifying device complexity while preserving control precision
Solution Approach 2:
The priority encoder acts as an intermediary that selectively routes feedback signals to the single operational amplifier based on priority levels, enabling precise control of multiple output channels without requiring multiple operational amplifiers
3Speed
If bandwidth of operational amplifiers is increased, then the transient response capability is improved, but the power consumption increases
Solution Approach 1:
By merging multiple control functions into a single operational amplifier, the system achieves improved transient response without increasing the bandwidth (and thus power consumption) of individual operational amplifiers, as the consolidation itself provides the performance benefit
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 converter effectively provides multiple output voltages using a single inductor, reducing power consumption and minimizing cross-interference among output units, suitable for low-power applications.
Implementation Method 1
The energy generation circuit includes an inductor, a charging switch, and a discharging switch
Data Source
AI summary
The present disclosure provides a single-inductor multiple-output voltage converter, a power supply chip, and an electronic device, where the single-inductor multiple-output voltage converter comprises an energy generation circuit, an energy distribution circuit, a peak-inductor-current detection circuit, a zero-inductor-current detection circuit, and a control logic circuit. The aforementioned converter can provide multiple different output voltages using a single inductor without multiple operational amplifiers, thereby avoiding excessive bandwidth demand associated with multiple operational amplifiers, thus reducing power consumption.