Multi-cell Voltage Regulator Dynamic Cell Activation
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Solution Overview
Problem
Voltage regulators experience low efficiency when load current is below the desired operating range, leading to inefficient operation and power wastage.
Innovation Solution
A multi-cell voltage regulator with a master controller that dynamically adjusts the number of active cells and switch legs based on load current and activity state to maintain optimal current-per-active-cell within a predefined range, using routines to determine and adjust the number of active cells and switch legs to ensure efficient operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the number of active cells is reduced to match low load current demand, then power conversion efficiency improves, but the regulator cannot respond quickly to sudden load increases
Solution Approach 1:
The regulator dynamically adjusts the number of active cells based on real-time load conditions. During low load periods, fewer cells remain active to maintain high efficiency. When load increases are detected, additional cells are rapidly activated to meet the increased demand, thus achieving both efficiency improvement and quick response capability
Solution Approach 2:
The voltage regulator is divided into multiple independent cells that can be selectively activated or deactivated. This segmentation allows the system to optimize efficiency by keeping only the necessary number of cells active at any given time, while maintaining the capability to quickly activate additional cells when load conditions change
2Power
If multiple cells operate in parallel to handle high load current, then current handling capacity increases, but power conversion efficiency decreases due to operating below optimal current-per-cell
Solution Approach 1:
The system dynamically determines the optimal number of active cells based on the current load requirements. By adjusting the active cell count in real-time, the regulator ensures that each active cell operates at or near its optimal current level, maintaining high efficiency even when total power delivery capacity is increased
Solution Approach 2:
The regulator changes the operating parameters by adjusting the number of active cells to match the load current requirements. This parameter adjustment ensures that each active cell receives an optimal share of the total current, preventing operation below the desired current range and maintaining high power conversion efficiency across varying power levels
3Device complexity
If a single large voltage regulator is used to handle all load conditions, then device complexity is reduced, but the ability to optimize efficiency across varying load ranges is limited
Solution Approach 1:
The voltage regulator is segmented into multiple independent cells, each capable of being independently controlled. This segmentation enables the system to optimize efficiency by activating only the necessary number of cells for the current load, while maintaining a relatively simple overall structure that can be implemented on a single integrated circuit
Solution Approach 2:
Multiple identical regulator cells are designed with the same structure and control logic, allowing them to be universally activated or deactivated based on load requirements. This multi-functionality approach maintains current handling flexibility and efficiency optimization without significantly increasing device complexity
Data Source
AI summary
In some embodiments, the number of active cells in a multi-cell voltage regulator is controlled so that the current-per-active-cell approaches a predefined target or to be within an acceptable range so that the active cells operate with suitable efficiency.