Ambient-Light LED Control via Switch-Mode Power Supply Pins
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing LED lamps require manual lighting control, leading to energy waste and reduced lifespan due to neglect, and existing motion-sensing lamps lack effective ambient light-based control solutions.
Innovation Solution
A lighting control system utilizing a switch-mode power supply with a photosensor and resistor circuit connected to a PWMD or LD pin, sensing ambient light intensity to automatically turn LED lights on or off.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If manual lighting control is used, then device complexity is reduced, but energy consumption increases and lamp lifespan decreases
Solution Approach 1:
The lighting system automatically controls its own operation through the photosensor detecting ambient light levels and the control circuit adjusting LED output accordingly, eliminating the need for manual user intervention while optimizing energy consumption based on actual lighting conditions
2Loss of energy
If motion-sensing control is implemented, then energy consumption is reduced, but device complexity increases
Solution Approach 1:
The patent combines the photosensor-based ambient light detection with the existing switch-mode power supply control circuitry, integrating the control function into the power supply module rather than adding a separate motion-sensing control system, thereby reducing overall device complexity while maintaining energy-saving benefits
3Loss of energy
If automatic lighting control is added, then energy consumption is reduced, but ease of operation decreases
Solution Approach 1:
The system autonomously monitors ambient light conditions through the photosensor and automatically adjusts LED lighting without requiring user intervention, making the operation as simple as leaving the switch in the on position while the system self-regulates based on environmental conditions
4Device complexity
If photosensor control circuit is integrated into power supply, then device complexity is reduced, but manufacturing precision requirements increase
Solution Approach 1:
The control circuit is designed to utilize existing components and pins within the switch-mode power supply module (such as the PWMD pin for pulse-width modulation control), making the same power supply module capable of both power conversion and lighting control functions, thereby reducing overall device complexity while using standard manufacturing processes
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 automatic LED lighting control based on ambient light, reducing energy consumption and extending lamp lifespan without altering the power supply layout, enhancing user convenience and willingness to use.
Implementation Method 1
a photosensor (21) to sense the ambient light intensity
Data Source
Figure 1
Figure 2
Figure 3
AI summary
The lighting control system includes a switch-mode power supply and a control circuit. The switch-mode power supply has an input terminal for connection to a power source and an output terminal for connection to a LED light source and further includes a PWMD pin and a linear dimming (LD) pin. The control circuit includes a photosensor and a resistor connected in series and is connected at one end to a DC voltage and grounded at the other end. The junction between the photosensor and the resistor is connected to the PWMD pin or the LD pin. The photosensor is adapted for sensing ambient light intensity to make the control circuit output a control voltage. The control voltage is transmitted to the switch-mode power supply via the PWMD pin or the LD pin, so that the LED light source is turned on or off.