Haptic Generator Voltage Control Across Coil Temperature Shifts
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Solution Overview
Problem
Haptic generators in electronic devices experience performance degradation due to over-utilization or under-utilization of power budgets caused by varying resistivity of coils under different thermal conditions, leading to inconsistent power performance at low and high temperatures.
Innovation Solution
A haptic power control technique that adjusts actuation voltage limits based on real-time resistance measurements to maintain consistent power delivery across varying thermal conditions, using closed-loop control and dynamic power management to compensate for manufacturing tolerances and thermal effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the haptic generator operates at low temperatures, then the power performance exceeds the power budget due to lower coil resistivity, but this causes over-utilization of power and performance degradation
Solution Approach 1:
The patent implements dynamic power control by adjusting the actuation voltage limit based on real-time temperature measurements. The system transitions from a static voltage limit to a dynamic one that adapts to thermal conditions, preventing over-utilization of power at low temperatures while maintaining adequate performance at high temperatures.
Solution Approach 2:
The system incorporates a feedback mechanism where temperature sensors continuously monitor thermal conditions and feed this information back to the power control circuitry. This closed-loop feedback enables the system to automatically adjust the voltage limit in response to temperature changes, ensuring power budget compliance across varying thermal environments.
2Reliability
If the haptic generator operates at high temperatures, then the power performance falls below the power budget due to higher coil resistivity, but this causes under-utilization of power and performance degradation
Solution Approach 1:
The dynamic voltage limit adjustment allows the system to increase the actuation voltage at high temperatures where coil resistivity increases. This dynamic adaptation compensates for the resistive losses and maintains peak power performance within the budget, preventing under-utilization of available power.
Solution Approach 2:
The system changes the operating parameter (actuation voltage limit) based on temperature conditions. By modifying this electrical parameter in response to thermal changes, the system compensates for resistivity variations and maintains consistent power delivery across the operating temperature range.
3Device complexity
If a fixed actuation voltage limit is used, then the system is simple to implement, but it cannot provide consistent power control across varying thermal conditions
Solution Approach 1:
The patent transitions from a static fixed voltage limit to a dynamic temperature-dependent voltage limit. This dynamic approach adds thermal sensing and adaptive control capabilities, achieving consistent power performance across thermal conditions while managing complexity through a structured control algorithm.
Solution Approach 2:
The system modifies the actuation voltage parameter based on temperature measurements. This parameter change strategy enables adaptive power control that maintains performance consistency, balancing the added complexity of temperature-dependent control with the benefit of reliable power delivery across varying thermal environments.
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
Ensures consistent haptic generator performance by optimizing power usage, preventing over-budget or under-budget scenarios, thereby enhancing operational reliability and efficiency across temperature variations.
Implementation Method 1
A haptic system may be used to provide haptic feedback (e.g., an alert) to a user of an electronic device
Implementation Method 2
A haptic power performance of a haptic generator of a haptic system can be or become over-budget of a power budget for the haptic generator due to a relatively lower resistivity of one or more coils of the haptic generator
Data Source
AI summary
Haptic power control techniques provide improved power control for the haptic generator to reduce deficiencies of operation and/or increase performance of the haptic generator across various thermal conditions. In some examples, a first resistance measurement can be obtained and used for estimating an actuation voltage limit for the haptic generator. In some examples, estimating the actuation voltage limit for the haptic generator using the first resistance measurement includes estimating a first actuation voltage limit for the haptic generator when the first resistance measurement is a first resistance value and estimating a second actuation voltage limit for the haptic generator when the first resistance measurement is a second resistance value.