Bidirectional Feedback Control for LED Power Supply Voltage Optimization
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional LED power supplies are limited in their ability to adjust power supply voltage in response to changing operating conditions, as they can only reduce power consumption but not increase it when higher power is required, leading to inefficiencies in power management.
Innovation Solution
A controller monitors current flow in multiple LED strings and adjusts the power supply voltage dynamically by sending feedback signals to the power converter, allowing it to either decrease or increase the output voltage based on current requirements, enabling real-time control of low dropout voltages and improving power efficiency across varying loading and temperature conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If conventional feedback control is used to reduce power supply voltage, then power consumption is reduced, but the power supply cannot increase voltage when higher power is required
Solution Approach 1:
The patent implements dynamic bidirectional feedback control that allows the power supply voltage to be adjusted in both directions (increase and decrease) based on real-time monitoring of LED string current. The controller compares actual current with target current and dynamically modifies the power supply output voltage accordingly, enabling the system to adapt to varying operating conditions including temperature changes and loading variations.
Solution Approach 2:
The patent employs a feedback mechanism where the controller monitors the current flow in LED strings and sends control signals to the power supply to adjust its output voltage. This closed-loop feedback system enables the power supply to respond to changing operating conditions by either increasing or decreasing voltage based on the difference between actual and target current values.
2Use of energy by stationary object
If power supply voltage is reduced to minimize dropout voltage, then power efficiency is improved, but the system cannot provide higher power when operating conditions require it
Solution Approach 1:
The system dynamically adjusts the power supply output voltage based on real-time monitoring of LED string current and operating conditions. The controller modifies the voltage level adaptively, allowing the power supply to operate at minimal dropout voltage for efficiency while being capable of providing higher power when temperature or loading conditions require increased current to the LED strings.
3Loss of energy
If fixed range feedback current is used, then power supply can be reduced, but the system lacks flexibility to increase power supply when needed
Solution Approach 1:
The patent implements a dynamic feedback control system that adjusts the power supply voltage bidirectionally based on real-time monitoring of LED string current. The controller compares actual current with target current and dynamically modifies the power supply output voltage accordingly, enabling the system to adapt to varying operating conditions including temperature changes and loading variations.
Solution Approach 2:
The system changes the operating parameters of the power supply dynamically by adjusting the output voltage level based on monitored current conditions. The controller modifies voltage parameters in real-time, allowing the power supply to operate at optimal efficiency points while maintaining the capability to provide higher power when operating conditions such as temperature or loading require increased current to the LED strings.
Data Source
AI summary
A power supply includes a power converter configured to convert an input voltage to a target output DC voltage in response to a feedback signal, the feedback signal having a value. The power supply also includes a regulator coupled to the power converter and configured to generate an output power status signal, which may be in one of two states depending whether an output current from the regulator is above or below a target current over a preset time duration. Further, a control circuit is coupled to the power converter and to the regulator and configured to increment or decrement the value of the feedback signal depending on the state of the power status signal.