Adaptive LED Drive Voltage Control via Self-Calibrating PFC
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional commercial electronic display systems waste power by fixing drive voltage for LED strings at a high level to account for worst-case scenarios, leading to inefficiency and increased energy consumption due to the need for additional dc to dc scaling converters.
Innovation Solution
A programmable controller adjusts drive voltage based on detected parameters, eliminating the need for fixed high drive voltage and intermediate dc to dc scaling by using a power supply with power factor correction to ensure optimal voltage and current alignment for LED strings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If drive voltage is fixed at a high level to account for worst-case scenarios, then reliability of LED operation is improved, but power consumption increases and energy efficiency deteriorates
Solution Approach 1:
The patent applies dynamics by transitioning from a fixed drive voltage to an adaptive drive voltage that changes based on actual LED string conditions. The system continuously monitors LED parameters and adjusts the drive voltage dynamically to match actual requirements, eliminating the need for fixed high voltage while maintaining reliability.
Solution Approach 2:
The patent changes the drive voltage parameter from a constant high value to a variable value that adapts to actual LED conditions. By monitoring parameters like LED forward voltage and current, the system adjusts the drive voltage parameter in real-time to optimize both reliability and energy efficiency.
2Adaptability or versatility
If fixed high drive voltage is used to ensure LED operation under worst-case conditions, then adaptability to varying conditions is improved, but power distribution efficiency deteriorates
Solution Approach 1:
The patent implements feedback by continuously monitoring LED string parameters (voltage, current, temperature) and using this information to adjust the drive voltage. This closed-loop control system adapts to varying conditions while optimizing power distribution efficiency by providing only the necessary voltage required at any given moment.
Solution Approach 2:
The system performs self-adjustment by automatically detecting LED conditions and modifying drive voltage without external intervention. The controller monitors LED parameters and self-regulates the power delivery to match actual needs, eliminating the need for fixed high voltage settings.
3Adaptability or versatility
If additional dc to dc scaling converters are added to adjust drive voltage, then power distribution flexibility is improved, but device complexity increases
Solution Approach 1:
The patent extracts and eliminates the need for additional dc to dc scaling converters by implementing intelligent control at the existing power supply level. By using feedback-based voltage regulation and adaptive drive circuits, the system achieves power distribution flexibility without requiring extra scaling hardware.
Solution Approach 2:
The existing power supply circuit is enhanced to perform multiple functions: it provides power factor correction, adaptive voltage regulation, and LED drive control all within a single integrated system. This multi-functional approach eliminates the need for separate dc to dc scaling converters while maintaining flexibility.
Data Source
AI summary
The present invention relates to circuits and methods for controlling one or more LED strings. The circuit comprises a programmable controller coupled to one or more detectors, wherein the one or more detectors are configured to detect one or more measurable parameters of one or more LEDs or LED drivers. The controller is configured to receive information from the one or more detectors related to the one or more measurable parameters and use that information to determine the desired drive voltage for the LED strings. The controller is associated with a power supply having power factor correction (PFC) capability. The controller provides the power supply with a control signal indicative of the desired drive voltage for one or more LED strings. The power supply also receives ac voltage and current waveforms as inputs and performs power factor correction and rectified waveforms related to the ac waveforms. The power supply generates the desired drive voltage based on the control signal.