All-Digital Scalable Controller for Switched-Capacitor DC-to-DC Converters
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Solution Overview
Problem
Conventional DC-DC converters for portable electronic devices are inefficient, bulky, and require a large number of components, limiting battery life and increasing device size due to the need for multiple voltage regulation ICs and inefficient conversion ratios.
Innovation Solution
An all-digital scalable controller circuit that dynamically switches through multiple modes using a binary search controller, eliminating the need for threshold-level generation circuitry and analog compensation, allowing for high voltage-resolution control with minimal complexity and power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If switched-inductor converters are used to achieve high efficiency, then conversion efficiency is improved, but device size increases due to large inductors
Solution Approach 1:
The patent replaces the mechanical/physical inductor component with a switched-capacitor circuit implementation. The inductance function is substituted by capacitive charge transfer through controlled switching, eliminating the need for large magnetic inductors while maintaining the voltage conversion function. This is achieved by using arrays of capacitors and switches that simulate inductive behavior through periodic charge redistribution.
Solution Approach 2:
The patent divides the voltage conversion function into multiple discrete capacitor stages that can be independently controlled. By segmenting the conversion process into multiple 2:1 ratio stages that can be selectively activated, the system achieves variable conversion ratios without requiring a single large inductor, thereby reducing overall device volume while maintaining efficiency.
2Adaptability or versatility
If multiple voltage regulation ICs are used to achieve wide output voltage range, then adaptability is improved, but device complexity increases
Solution Approach 1:
The patent implements a universal switched-capacitor converter that can generate multiple output voltages through a single integrated circuit. By using reconfigurable capacitor arrays and controlled switching networks, the same hardware structure can be dynamically reconfigured to provide different voltage conversion ratios, eliminating the need for multiple separate voltage regulation ICs and reducing overall system complexity.
Solution Approach 2:
The patent employs dynamic reconfiguration of the capacitor network to adapt the conversion ratio in real-time. Control logic dynamically switches between different capacitor connections and switching patterns to achieve the desired output voltage, allowing a single static hardware structure to perform multiple voltage regulation functions that would otherwise require multiple fixed ICs.
3Device complexity
If conventional switched-capacitor converters are used to reduce device size, then device complexity is reduced, but conversion efficiency decreases due to discrete ratio limitations
Solution Approach 1:
The patent introduces dynamic control of the switched-capacitor network to optimize the conversion path. By dynamically selecting which capacitors to charge and discharge in each switching cycle, and by dynamically adjusting the switching frequencies of different stages, the system minimizes charge sharing losses and maximizes transfer efficiency for the specific target voltage ratio, overcoming the static limitations of conventional designs.
Solution Approach 2:
The patent changes the operating parameters of the switched-capacitor converter by dynamically adjusting switching frequencies and duty cycles based on the target conversion ratio. This allows the system to optimize capacitor utilization and minimize resistive losses for each operating point, thereby maintaining high efficiency across multiple discrete ratios while keeping the device compact.
Data Source
AI summary
A scalable controller circuit that provides faster and simpler regulation of a DC-to-DC converter is provided. Unlike such prior techniques, preferred embodiments do not require any threshold-level generation circuitry or analog compensation circuitry. Preferred embodiments implement a simple control law that requires only a few digital gates. Preferred embodiments can therefore significantly reduce the overhead power consumption and area of the controller in DC-to-DC converters to new levels.