Dynamic LED Voltage Control for Wearable Physiological Sensing
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Solution Overview
Problem
Wearable devices face inefficiencies in power management and measurement quality due to fixed or feature-based LED voltage settings, leading to increased latency, component aging, and decreased user experience.
Innovation Solution
Implementing dynamic LED voltage control based on LED configuration, adjusting the starting input voltage to maintain a threshold voltage for optimal power consumption and measurement quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If fixed LED voltage is used, then device complexity is reduced, but power consumption increases and LED lifespan decreases
Solution Approach 1:
The patent implements dynamic LED voltage control that adjusts the starting input voltage based on the specific LED configuration being used. Instead of using a fixed voltage, the system dynamically determines the appropriate voltage level (e.g., 3.7V for standard PPG measurements, 4.5V for daytime HR measurements) to optimize both power consumption and measurement quality, thereby resolving the contradiction between simplicity and energy efficiency.
Solution Approach 2:
The system changes the voltage parameter dynamically based on LED configuration requirements. The processor selects different starting input voltages corresponding to different LED configurations, allowing the system to adapt the voltage parameter to match the specific measurement needs, which reduces unnecessary power consumption while maintaining measurement quality.
2Measurement precision
If higher LED voltage is used, then measurement quality improves, but LED lifespan decreases and power consumption increases
Solution Approach 1:
The patent applies parameter changes by selecting different starting input voltages based on the specific LED configuration and measurement requirements. The system uses simulations to determine the minimum necessary voltage for each configuration, ensuring sufficient measurement quality while minimizing voltage stress on the LEDs, thereby extending their operational lifespan.
Solution Approach 2:
Instead of consistently applying maximum voltage to ensure measurement quality, the system applies only the necessary voltage level required for each specific LED configuration. This partial action approach avoids excessive voltage application that would accelerate LED aging, while still achieving adequate measurement quality through optimized voltage selection.
3Power
If higher starting input voltage is used, then LED power output increases, but charging time increases and latency increases
Solution Approach 1:
The system dynamically adjusts the starting input voltage parameter based on the LED configuration being used. By selecting the minimum necessary voltage for each configuration through simulations, the system reduces the charging time required to reach operational voltage levels, thereby decreasing measurement latency while still providing sufficient LED power output for quality measurements.
4Adaptability or versatility
If feature-based voltage adjustment is used, then adaptability improves, but device complexity increases
Solution Approach 1:
The system implements self-service through automated voltage selection based on LED configuration. The processor automatically determines the appropriate starting input voltage by referencing pre-stored LED configuration information, eliminating the need for manual intervention or complex real-time calculations, thus achieving adaptability while keeping the control system relatively simple.
Solution Approach 2:
The patent applies preliminary action by pre-determining the appropriate starting input voltages for different LED configurations through simulations before actual measurements are taken. These pre-calculated voltage values are stored and automatically selected based on the LED configuration, enabling adaptive voltage adjustment without adding significant complexity to the control system.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Reduces power consumption and increases measurement quality by extending LED lifespan and improving user experience through granular voltage adjustments.
Implementation Method 1
Some wearable devices may be configured to collect physiological data from users using one or more light-emitting components (e.g., light-emitting diodes (LEDs))
Implementation Method 2
one or more light-receiving components (e.g., photodiodes)
Data Source
AI summary
Methods, systems, and devices for voltage control for wireless devices are described. The described techniques may enable a wearable device to dynamically select and adjust the starting input voltage (e.g., VLED) for one or more light emitting diodes (LEDs). In particular, a wearable device may dynamically determine the starting input voltage of the LEDs based on an LED configuration to be used by the LEDs, and a threshold anode line voltage to power the LEDs. The LED configuration may include parameters or characteristics of the LEDs to perform physiological measurements. The wearable device may determine an LED configuration that may be used to collect physiological data, and may perform simulations to model the voltage of the anode line throughout a measurement interval based on the LED configuration. The wearable device may determine a VLED that may maintain a voltage of the anode line above the threshold anode line voltage.