Multi-Loop Control Handover With a Shared Integrator
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Solution Overview
Problem
Traditional control systems for battery charging in portable electronic devices face issues with overshoots and slow loop transitions due to multiple independent control paths and integral paths, which hinder effective regulation of multiple physical quantities.
Innovation Solution
A multi-feedback loop control system with cross-coupled control loops, featuring proportional and integral paths, and combiner logic to generate a control parameter, allowing for the selection of optimal control outputs from multiple loops to regulate battery charging efficiently.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple independent control paths with separate integral paths are used to regulate multiple physical quantities, then each control loop can independently process its error signal, but this leads to overshoots and slow loop transitions
Solution Approach 1:
The patent merges multiple independent integral paths into a single shared integrator that serves all control loops. This consolidation allows the integrator to accumulate error signals from multiple loops and distribute the integrated value appropriately, preventing individual loops from developing independent integral windup that causes overshoots. The shared integrator ensures coordinated response across all loops, improving transition stability while maintaining regulation accuracy.
Solution Approach 2:
The patent introduces a minimum selector as an intermediary component that receives control values from multiple proportional paths and selects the minimum value to pass to the shared integrator. This intermediary mechanism coordinates the interactions between multiple control loops by ensuring that the most restrictive control constraint is applied, preventing any single loop from causing overshoots while maintaining responsive regulation of all physical quantities.
2Reliability
If multiple independent control paths are implemented for various physical quantities, then comprehensive regulation is achieved, but device complexity increases
Solution Approach 1:
The patent reduces device complexity by merging multiple separate integrators into a single shared integrator that serves all control loops. This consolidation eliminates redundant components while maintaining the ability to regulate multiple physical quantities. The shared integrator, combined with the minimum selector, provides a more compact and simpler control system architecture compared to having independent integral paths for each loop.
Solution Approach 2:
The shared integrator is designed to perform multiple functions by accumulating error signals from different control loops and distributing the integrated output to appropriate loops. This multi-functional component replaces what would otherwise require multiple specialized integrators, reducing overall system complexity while maintaining comprehensive regulation capabilities for voltage, current, and other physical quantities.
3Ease of operation
If separate integral paths are used for each control loop, then independent error processing is enabled, but loop transitions become slow
Solution Approach 1:
The patent improves loop transition speed by merging multiple integral paths into a single shared integrator. This consolidation allows the integrator to process error signals more efficiently and propagate control adjustments across all loops simultaneously, rather than having each loop process errors independently at separate rates. The shared integrator creates a unified response mechanism that accelerates loop transitions while still enabling comprehensive error signal processing.
Solution Approach 2:
The minimum selector acts as an intermediary that accelerates loop transitions by quickly identifying and selecting the minimum control value from multiple proportional paths. This intermediary mechanism enables rapid response to changing conditions by immediately applying the most restrictive control constraint, thereby speeding up loop transitions while maintaining proper error signal processing through the shared integrator.
Data Source
AI summary
A controller for generating a control parameter of a feedback system may include a proportional path comprising a first selector configured to select one of a plurality of proportional signals to generate a proportional path output, wherein each of the proportional signals is based on a respective one of a plurality of error signals, each of the plurality of error signals associated with a respective regulated physical quantity, an integral path comprising a second selector configured to select one of a plurality of integral signals as a second selector output, wherein each of the integral signals is based on a respective one of the plurality of error signals and a single integrator configured to accumulate successive samples of the second selector output to generate an integral path output, and combiner logic configured to combine the proportional path output and the integral path output to generate the control parameter.