LED Supply Voltage Control for Headroom-Aware Power Reduction
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Solution Overview
Problem
Existing LED driver circuitry designs face inefficiencies due to headroom voltages that can prevent LEDs from being sufficiently forward biased, leading to increased power consumption and reduced performance, especially in user-specific devices where headroom voltages are less than the worst case scenario.
Innovation Solution
The implementation of voltage control circuitry that adjusts the LED supply voltage based on measured headroom voltages, using a power converter to supply a modified voltage that minimizes power consumption while ensuring adequate forward biasing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a fixed high LED supply voltage is used to ensure adequate forward biasing under worst-case conditions, then LED reliability is improved, but power consumption increases and efficiency decreases
Solution Approach 1:
The patent implements dynamic voltage adjustment by measuring the actual headroom voltage in real-time and modifying the LED supply voltage accordingly. Instead of using a fixed high voltage designed for worst-case scenarios, the system continuously adapts the voltage level based on measured conditions, thereby reducing power consumption while ensuring adequate LED forward biasing when needed.
Solution Approach 2:
The system incorporates feedback mechanisms by measuring the headroom voltage and using this information to adjust the LED supply voltage. The voltage control circuitry receives feedback about actual operating conditions and modifies the supply voltage to optimize the balance between LED reliability and power consumption, avoiding the inefficiency of always operating at maximum voltage.
2Reliability
If a fixed high LED supply voltage is used to account for worst-case headroom voltages, then LED performance is improved, but device complexity increases due to over-engineering
Solution Approach 1:
The system performs self-service by automatically measuring its own headroom voltage and adjusting the LED supply voltage without external intervention. The voltage control circuitry monitors the actual conditions and self-regulates the voltage level, eliminating the need for complex external control systems or manual adjustment mechanisms while ensuring adequate LED performance.
Solution Approach 2:
The patent changes the voltage parameter dynamically based on measured headroom conditions. Instead of designing for a fixed worst-case voltage parameter, the system adjusts the voltage parameter in real-time according to actual operating conditions, thereby simplifying the overall system design while maintaining LED reliability.
3Use of energy by moving object
If the LED supply voltage is reduced to minimize power consumption, then energy efficiency is improved, but headroom voltages may become insufficient for adequate LED forward biasing
Solution Approach 1:
The system dynamically adjusts the LED supply voltage based on measured headroom conditions, allowing the voltage to be reduced to minimize power consumption when conditions permit, while automatically increasing it when adequate forward biasing becomes necessary. This dynamic approach resolves the contradiction by making the voltage level responsive to actual operating conditions rather than fixed.
Solution Approach 2:
The feedback mechanism measures the actual headroom voltage and uses this information to determine the appropriate LED supply voltage level. When headroom voltage is sufficient, the system reduces supply voltage to minimize power consumption; when headroom voltage indicates potential insufficiency, the system increases supply voltage to ensure adequate LED forward biasing, thus resolving the contradiction through condition-based adjustment.
Data Source
AI summary
An example apparatus includes: driver circuitry having a first terminal and a second terminal; and voltage control circuitry having a first terminal and a second terminal, the first terminal of the voltage control circuitry coupled to the first terminal of the driver circuitry, the second terminal of the voltage control circuitry coupled to the second terminal of the driver circuitry, the voltage control circuitry configured to supply an LED supply voltage.