Radio Load Throttling for Low-Voltage Battery Operation
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Solution Overview
Problem
Battery-operated devices with time-synchronized radios face power limitations, leading to voltage drops and potential resets, especially as batteries age or in cold temperatures, causing unreliable operation and premature device failure.
Innovation Solution
A radio load throttling method that monitors battery voltage and adjusts radio frequency activity based on available power, disabling or reducing RF operations when voltage drops below a threshold to prevent resets and maintain device connectivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the radio follows a strict predetermined schedule, then time synchronization is maintained, but power consumption exceeds battery capacity causing voltage drops
Solution Approach 1:
The radio schedule transitions from static to dynamic based on battery conditions. The controller monitors voltage and adjusts the operation schedule in real-time, maintaining time synchronization within acceptable tolerances while adapting power consumption to match available battery capacity.
Solution Approach 2:
When battery voltage is insufficient, the system performs partial radio operations rather than the full predetermined schedule. The controller selectively executes transmitting and receiving tasks based on available power, performing only those operations that can be completed without causing voltage drops below reset thresholds.
Data Source
AI summary
A device includes a radio operating on a predetermined schedule, and a battery configured to supply power to the radio for radio operation. A radio controller is configured control to radio operation. A voltage indicating circuit is configured to monitor a voltage of the battery, and to provide an output signal indicative of a battery voltage sufficient to power radio operation. When the output signal is active, the radio controller allows operation of the radio on the predetermined schedule. When the output signal is inactive, the radio controller adjusts operation of the radio to maintain radio operation.