Shared Feedback Memory Element for Power Converter Control
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Solution Overview
Problem
Existing power converter systems for portable electronic devices lack effective mechanisms to limit current drawn from batteries, leading to potential over-discharge, reduced battery life, and instability in power delivery, especially considering the complex transient responses of lithium-ion batteries and practical limitations in power converter design.
Innovation Solution
A power delivery system with a power converter and control circuitry that includes multiple control mechanisms and a shared feedback memory element to dynamically adjust and limit current based on physical quantities, ensuring battery protection, power converter stability, and practical implementation constraints, using a combination of feedback loops and reactive engines to manage current limits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple independent control mechanisms are used to manage different physical quantities, then control precision and reliability are improved, but device complexity increases
Solution Approach 1:
The patent combines multiple independent control mechanisms (first control mechanism for voltage, second control mechanism for current) into a unified control system that shares a common feedback path through the memory element. This merging reduces device complexity while maintaining the reliability benefits of multiple control mechanisms by having them cooperate through shared feedback rather than operating independently.
Solution Approach 2:
The memory element serves as a universal feedback component that is shared by both control mechanisms. This single component performs the function of storing and providing feedback information to both the voltage control mechanism and the current control mechanism, eliminating the need for separate feedback paths and reducing overall circuit complexity.
2Device complexity
If a shared feedback path is used among control mechanisms, then device complexity is reduced, but control precision may deteriorate due to interference between mechanisms
Solution Approach 1:
The memory element acts as an intermediary between the multiple control mechanisms. It receives feedback information and provides it to both control mechanisms in a coordinated manner, preventing direct interference between them while still allowing them to share the common feedback path. This mediator role maintains control precision despite the shared feedback architecture.
Solution Approach 2:
The patent implements a feedback mechanism where the memory element stores control variable information that is fed back to both control mechanisms. This feedback ensures that each mechanism can adjust its operation based on the actual system state, maintaining precision while using the simplified shared feedback structure.
3Reliability
If current limiting mechanisms are added to protect batteries, then battery reliability is improved, but power converter stability may deteriorate
Solution Approach 1:
The control mechanisms dynamically adjust their operation based on real-time feedback from the memory element. The system can adaptively switch between different control modes (voltage control vs. current control) depending on operating conditions, ensuring that current limiting for battery protection does not permanently compromise power converter stability. The dynamic response allows the system to maintain stability while providing protection.
Data Source
AI summary
A power delivery system may include a power converter configured to electrically couple to a power source and further configured to supply electrical energy to one or more loads electrically coupled to an output of the power converter and control circuitry configured to control the power converter in accordance with a control variable. The control circuitry may include a first control mechanism configured to generate a first intermediate control variable based on a first physical quantity associated with the power delivery system, a second control mechanism configured to generate a second intermediate control variable based on a second physical quantity associated with the power delivery system, a selector configured to select the control variable from the first intermediate control variable and the second intermediate control variable, and a shared feedback memory element configured to feed back the control variable to inputs of the first control mechanism and the second control mechanism, such that the first control mechanism generates the first intermediate control variable based on the first physical quantity and the control variable, and the second control mechanism generates the second intermediate control variable based on the second physical quantity and the control variable.