Phototherapy LED Driver with Programmable Waveform Control
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Solution Overview
Problem
Current LED phototherapy devices face challenges in maintaining consistent LED operation due to voltage source drive, inadequate current balancing, and mechanical design limitations, leading to inefficient photobiomodulation and impractical treatment durations.
Innovation Solution
A phototherapy system using LEDs arranged in serial strings with a microcontroller-driven channel driver, capable of generating defined patterns of electromagnetic radiation, including square-wave pulses, to ensure uniform radiation delivery across a flexible pad conforming to the body, allowing for adjustable sequencing and programmable waveform synthesis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If voltage source drive is used for LED phototherapy devices, then device simplicity is maintained, but LED operation consistency deteriorates
Solution Approach 1:
The patent replaces the voltage source drive system with a current source drive system. This substitution fundamentally changes the control mechanism from voltage-based to current-based, ensuring consistent LED operation by directly controlling the current flowing through each LED, thereby resolving the contradiction between device simplicity and LED operation consistency.
Solution Approach 2:
The patent implements feedback control mechanisms through channel drivers that monitor and adjust current distribution to each LED string. This feedback system ensures that voltage variations or LED individual differences do not affect operational consistency, maintaining reliable LED performance while managing system complexity through intelligent control.
2Device complexity
If voltage source drive with inadequate current balancing is used, then device complexity is reduced, but photobiomodulation efficiency deteriorates
Solution Approach 1:
The patent employs feedback control in the channel driver circuitry to monitor and balance current distribution across multiple LED strings. This ensures that each LED receives the appropriate current level, maximizing photobiomodulation efficiency by eliminating under-driven or over-driven LEDs, while the feedback mechanism manages complexity through intelligent current regulation.
Solution Approach 2:
The patent dynamically adjusts current parameters for each LED string based on actual operating conditions and LED characteristics. By changing the current parameter individually for each channel, the system optimizes photobiomodulation efficiency across all LEDs, transforming the inadequate fixed current distribution into adaptive, optimized current delivery.
3Device complexity
If fixed frequency operation is used, then device complexity is minimized, but treatment adaptability deteriorates
Solution Approach 1:
The patent transitions from fixed frequency operation to dynamic, programmable frequency control. The microcontroller enables the system to vary operating frequencies and pulse patterns according to different treatment protocols, making the device adaptable to various medical conditions while managing complexity through software-based control rather than hardware complexity.
Solution Approach 2:
The patent implements a universal control architecture where a single microcontroller manages multiple treatment modes, frequencies, and pulse patterns. This multi-functional capability allows one device to perform various phototherapy treatments for different conditions, achieving high adaptability without proportionally increasing device complexity through modular, software-driven functionality.
4Productivity
If extended treatment durations are required for effective photobiomodulation, then treatment efficacy is improved, but patient compliance deteriorates
Solution Approach 1:
The patent employs periodic pulsed LED operation instead of continuous illumination. By delivering phototherapy in controlled pulses with appropriate duty cycles, the system achieves effective photobiomodulation over extended durations while reducing patient discomfort and improving compliance. The periodic action allows treatment continuation without overwhelming patient tolerance.
Solution Approach 2:
The patent uses dynamic control of treatment parameters including pulse duration, frequency, and intensity variations during extended sessions. This dynamic adjustment maintains treatment efficacy throughout extended durations while adapting to patient comfort levels, thereby improving compliance without sacrificing productivity or treatment effectiveness.
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
Enables effective and uniform photobiomodulation over extended durations, improving treatment efficacy and flexibility for various medical conditions by ensuring consistent and controlled LED operation and adaptable treatment protocols.
Implementation Method 1
The radiation is generated by light-emitting diodes (LEDs) that are arranged in serial 'strings' connected to a common power supply
Data Source
AI summary
A phototherapy or photobiomodulation process employing the application of electromagnetic radiation (EMR) to a living organism, typically a human being. The EMR is generated by one or more strings of LEDs and is programmed to emit one or more wavelengths, typically in the visible and infrared portions of the spectrum, the EMR in each wavelength being delivered in pulses having specified on-times, off-times, photoexcitation frequencies, duty factors, phase delays, and power amplitudes. A system for providing such EMR includes a microcontroller having a pattern library of algorithms, each of which defines a particular sequence of synthesized pulses, and an application pad, preferably flexible, containing the LED strings.