Electronic Contact Lens Cell Isolation Circuit for Predictable Power Flow
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Solution Overview
Problem
Existing electronic contact lenses face challenges in managing power distribution among battery cells, particularly during assembly and when defective cells are present, leading to unpredictable behavior and potential damage.
Innovation Solution
A power management integrated circuit (PMIC) with isolation control circuits, utilizing active switches like PMOS and NMOS transistors, to manage battery cell connections and isolate defective cells, ensuring predictable power flow and preventing damage during assembly and operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If battery cells are connected to power-consuming circuits during assembly, then the contact lens can be assembled and tested, but unpredictable behavior and potential damage may occur due to current flow from cells with varying states of charge
Solution Approach 1:
The isolation control circuit is configured to automatically disconnect battery cells from power-consuming circuits upon detection of assembly completion or defective conditions, preventing harmful current flow before damage can occur. This preliminary protective action resolves the contradiction by enabling safe assembly testing while maintaining reliability through automated cell isolation.
2Device complexity
If defective battery cells remain connected to the contact lens, then the device structure remains simple, but the defective cells can cause unpredictable behavior and potential damage to the contact lens
Solution Approach 1:
The isolation control circuit acts as an intermediary between battery cells and power-consuming circuits, monitoring cell health and automatically isolating defective cells. This intermediary mechanism protects the contact lens from defective cells while adding minimal complexity, as the isolation logic is integrated into the power management system rather than requiring separate complex protection circuits.
3Use of energy by moving object
If current flows from battery cells with varying states of charge, then power can be supplied to circuits, but the current flow causes unpredictable behavior and potential damage
Solution Approach 1:
The isolation control circuit continuously monitors the state of charge and health of battery cells, using feedback signals to determine when to isolate individual cells. This feedback mechanism ensures reliable and predictable power distribution by preventing harmful current flow from cells with varying states of charge, while still enabling power supply to circuits when conditions are appropriate.
Data Source
AI summary
An electronic contact lens. In some embodiments, the electronic contact lens includes: a power management circuit; and a first cell, the power management circuit including an active switch, the active switch being configured to isolate the first cell from other contact lens elements when the power management circuit is powered down.