Switching Converter With Optical Feedback For LED Luminous Intensity Control
Solution Overview
Problem
Conventional light emitting systems using LEDs have low power efficiency and consume unnecessary power due to the use of voltage or current feedback circuits, which affect the stabilization of luminous intensity and lead to inefficient power management.
Innovation Solution
A switching converter with light intensity feedback, comprising a conversion circuit, a light detecting feedback circuit, and a control circuit that adjusts the output signal based on detected luminous intensity, eliminating the need for voltage or current feedback sources and enhancing power efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If voltage or current feedback circuits are used to stabilize luminous intensity, then luminous intensity stabilization is improved, but power efficiency deteriorates due to unnecessary power consumption
Solution Approach 1:
The patent replaces voltage or current feedback circuits with an optical feedback circuit using a light detecting element (photodiode) to sense luminous intensity. This substitution of electrical feedback with optical feedback eliminates the power consumption associated with voltage/current sensing circuits while maintaining accurate luminous intensity stabilization through optical measurement.
2Measurement precision
If voltage or current feedback circuits are used for control, then control precision is improved, but power consumption increases
Solution Approach 1:
The patent substitutes electrical feedback circuits with an optical feedback circuit that uses a light detecting element to measure luminous intensity. This provides precise control through optical sensing while eliminating the continuous power consumption required by voltage or current feedback circuits, as the photodiode only consumes power during measurement moments.
3Use of energy by stationary object
If light detecting circuit is used to detect ambient light for power saving, then power consumption is reduced, but response time increases due to threshold-based control
Solution Approach 1:
The patent implements continuous optical feedback by using a light detecting element to constantly monitor luminous intensity and provide real-time feedback signals to the control circuit. This continuous feedback mechanism enables immediate response to any changes in light output, eliminating the delayed response inherent in threshold-based ambient light detection while maintaining power saving benefits.
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
The solution provides higher power efficiency, accurate control of luminous intensity, and extended service life for light emitting elements by using light as the sole feedback source, reducing unnecessary power consumption and improving the adjustment of light intensity and color.
Implementation Method 1
The feedback circuit comprises a light detecting element capable of detecting an external light to generate a feedback signal
Data Source
AI summary
A light emitting apparatus comprises a light emitting element and a switching converter comprising a conversion circuit for converting an operating electric signal to generate the driving electric signal, a feedback circuit having a light detecting element for detecting a luminous intensity of the light emitting element and generating a feedback signal, and a control circuit for receiving the feedback signal, comparing the received feedback signal with a reference electric signal, and controlling the conversion circuit based on comparison results to adjust the driving electric signal. Alternatively, the light detecting element detects ambient light and the control circuit controls the conversion circuit based on comparison results to stop or enable outputting of the driving electric signal.