Zero-Power Mode for Non-Removable Battery Drain
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Solution Overview
Problem
Battery-powered devices with non-removable batteries face significant battery drain due to quiescent current during the extended period between manufacturing and end-user usage, leading to disappointing device functionality.
Innovation Solution
Implementing a zero-power mode in battery-powered devices with non-removable batteries, where a protective plastic wrap with a small metal short between charging pins initiates a low-power state, allowing only the control circuit to remain powered, significantly reducing energy consumption, and switching to normal power mode when the user removes the packaging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the device is left in normal power mode during the extended period from manufacturing to end user usage, then the device is ready to function immediately upon activation, but the battery power is substantially reduced due to quiescent current consumption
Solution Approach 1:
The device is configured to automatically enter zero-power mode during the extended period from manufacturing to end user activation. This preliminary action of switching to low-power state before actual use prevents battery drain while ensuring the device can be quickly reactivated when needed, resolving the contradiction between immediate functionality and battery preservation during storage.
2Use of energy by moving object
If the device enters zero-power mode to reduce quiescent current, then battery life is extended, but the device cannot function until reactivated by the user
Solution Approach 1:
The device dynamically transitions between zero-power mode and normal power mode based on activation conditions. When the user removes the protective packaging or connects the charging cable, the device automatically switches from zero-power mode to normal power mode, ensuring immediate functionality while maintaining extended battery life during storage periods.
3Loss of energy
If a removable battery with plastic strip disconnect method is used, then battery drain during storage is prevented, but the solution is not suitable for devices with non-removable batteries
Solution Approach 1:
The zero-power mode solution provides a universal approach that works for both removable and non-removable battery configurations. Unlike the plastic strip disconnect method that only works with removable batteries, the zero-power mode can be implemented in any battery-powered device, making it adaptable to various device designs and battery types.
Data Source
AI summary
Various systems and methods for implementing zero-power mode are described herein. A battery-powered apparatus includes a non-removable battery for powering processing circuitry of the apparatus, charging pins to connect the apparatus to a charging source, and control circuitry that is separate from the processing circuitry. The control circuitry can perform operations that detect the charging pins are shorted and activate a timer for a predetermined wait interval. The control circuitry can also, upon expiration of the timer, disconnect the battery from powering the processing circuitry to activate a device zero-power mode. Upon detecting the charging pins are no longer shorted, the control circuitry can resume power to the processing circuitry. The non-removable battery is only powering the control circuitry while the battery is disconnected from the processing circuitry.