Load Driver Feedback Voltage Adjustment
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Solution Overview
Problem
Existing load drivers with a two-converter type configuration face efficiency issues due to variations in output voltage caused by temperature changes and differences in load unit elements, requiring constant voltage settings that lead to inefficiencies, especially when driving multiple LEDs connected in series.
Innovation Solution
A load driver design incorporating a rectifying unit, a first converter, a second converter, and a feedback unit that adjusts the first converter's output voltage based on feedback information from the second converter, allowing the difference between the two voltages to be optimized, thereby improving efficiency and eliminating the need for design variations based on load changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the output voltage from the first converter is set to a constant value to address variations in the second converter's output voltage, then the reliability of driving the load is improved, but the efficiency deteriorates due to large voltage difference
Solution Approach 1:
The patent applies dynamics by making the output voltage of the first converter adjustable rather than fixed. The control unit dynamically adjusts the first converter's output voltage based on feedback from the second converter, allowing the system to adapt to varying load conditions while maintaining appropriate voltage differences for efficient operation.
Solution Approach 2:
The patent implements feedback by having the control unit receive information about the second converter's output voltage and use this feedback to adjust the first converter's output voltage accordingly. This closed-loop control ensures that the voltage difference between converters is optimized for efficiency while maintaining reliable load driving capability.
2Manufacturing precision
If the load driver is designed for specific number of LEDs to output appropriate voltage, then the manufacturing precision is improved, but the adaptability deteriorates
Solution Approach 1:
The patent applies universality by designing a single load driver that can drive loads with different numbers of LEDs. The control unit adjusts the first converter's output voltage based on feedback about the second converter's performance, allowing the same circuit to adapt to various LED configurations without requiring design changes.
Solution Approach 2:
The patent uses dynamics by implementing adjustable voltage output through control unit adjustments. Rather than being fixed for specific LED counts, the system dynamically adapts its voltage output based on real-time feedback about the actual load conditions and second converter performance.
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
This configuration enhances efficiency by reducing the difference voltage between the first and second converters, achieving higher efficiency compared to traditional methods, and allows for consistent operation across varying load conditions without requiring specific design adjustments for different numbers of LEDs.
Implementation Method 1
a rectifying unit configured to rectify an AC voltage from a power source to generate a first voltage
Implementation Method 2
a first converter configured to convert the first voltage outputted from the rectifying unit into a second voltage
Implementation Method 3
a second converter configured to drive a load with a constant current, based on the second voltage converted by the first converter
Data Source
AI summary
A load driver includes: a rectifying unit configured to rectify an AC voltage from a power source to generate a first voltage; a first converter configured to convert the first voltage outputted from the rectifying unit into a second voltage; a second converter configured to drive a load with a constant current, based on the second voltage converted by the first converter; and a feedback unit configured to generate feedback information, based on information obtained from the second converter and indicating an output voltage when the second converter drives the load with the constant current, wherein the first converter converts the first voltage into the second voltage having a magnitude based on the feedback information obtained from the feedback unit.