Wearable Sensor Charging Circuit for Low-Battery Communication Cutoff
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Solution Overview
Problem
The existing wearable sensor terminals face issues with current consumption during charging, leading to failed charging operations due to the wireless communication module's activation at lower power supply voltages, causing the battery to overdischarge and preventing normal functioning during charging.
Innovation Solution
Incorporating a protection circuit that stops the power supply voltage to the wireless communication device when the battery voltage is lower than a threshold, ensuring that the charging current is not consumed by the communication module during low-speed charging, and allowing the device to function normally by switching to fast charging when the voltage is sufficient.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the wireless communication module is allowed to operate at lower power supply voltages during charging, then the communication function can be used during charging, but the charging current is consumed by the communication module causing charging failure and battery overdischarge
Solution Approach 1:
The patent changes the power supply voltage parameter to the wireless communication module based on the charging state. When charging is detected, the voltage is reduced to a level that prevents the communication module from operating, thereby eliminating current consumption during charging. When charging is complete, the voltage is restored to normal operating levels, enabling communication functions.
Solution Approach 2:
The patent introduces a protection circuit as an intermediary between the power supply and the wireless communication module. This protection circuit monitors the charging state and controls the power supply voltage to the communication module accordingly, acting as a mediator that prevents direct conflict between charging and communication operations.
2Reliability
If the power supply voltage to the wireless communication device is stopped during low-voltage charging, then charging current is preserved for battery charging, but the communication function cannot be used during charging
Solution Approach 1:
The patent makes the power supply voltage to the wireless communication module dynamic rather than static. The voltage is adjusted in real-time based on the charging state: reduced during charging to ensure reliable battery charging, and restored after charging to enable communication functions. This dynamic adjustment resolves the contradiction between reliable charging and communication versatility.
3Productivity
If fast charging is used when battery voltage is low, then charging speed is improved, but the wireless communication module may consume excessive current causing system instability
Solution Approach 1:
The patent implements a feedback mechanism where the protection circuit continuously monitors the battery voltage and charging state. Based on this feedback, the system automatically adjusts the power supply voltage to the wireless communication module. When fast charging is detected or battery voltage is low, the communication module's power is reduced, preventing excessive current consumption and maintaining system stability.
Data Source
AI summary
An embodiment wearable sensor terminal includes a secondary battery, a charging IC that performs fast charging of the secondary battery when the voltage of the secondary battery is equal to or higher than a threshold voltage, a wireless communication module, an LDO regulator that converts the voltage of the secondary battery and supplies the wireless communication module with the voltage, and a protection circuit that stops the supply of the power supply voltage from the LDO regulator to the wireless communication module when the voltage of the secondary battery is lower than the threshold voltage at the time of charging.