LED Power Supply Circuit Reducing Conversion Loss via Segmentation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional power supply circuits for LEDs experience high power conversion loss and inefficiency due to the need for high voltage conversion, which also results in high pressure-resistant components and increased costs.
Innovation Solution
A power supply circuit design that converts input voltage into a low voltage level using a rear-stage converting circuit, with a control circuit to maintain constant current through the LED string, reducing power conversion loss and using low pressure-resistant components to lower fabrication costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the input voltage is converted into a higher voltage level to drive the LED string, then the driving voltage requirement is met, but the power conversion loss increases and operating efficiency deteriorates
Solution Approach 1:
The power supply circuit is divided into a front-stage converting circuit and a rear-stage converting circuit. The front-stage circuit converts input voltage to a transition voltage, while the rear-stage circuit converts the transition voltage to a compensating voltage. This segmentation allows the rear-stage circuit to operate at lower voltage levels, reducing power conversion loss while still achieving the required driving voltage when combined with the input voltage.
Solution Approach 2:
The circuit changes the voltage level parameters at different stages. The rear-stage converting circuit is designed to convert to a low voltage level compensating voltage rather than directly to the high driving voltage, thereby reducing power conversion loss. The control circuit adjusts the compensating voltage to maintain constant current through the LED string.
2Power
If the input voltage is converted into a higher voltage level, then the LED string driving requirement is satisfied, but high pressure-resistant components are required increasing fabrication cost
Solution Approach 1:
By segmenting the voltage conversion into two stages, the rear-stage converting circuit only needs to generate a compensating voltage rather than the full driving voltage. This allows the use of low pressure-resistant components in the rear-stage circuit, reducing fabrication cost while still meeting the overall driving voltage requirement through the combination of input voltage and compensating voltage.
3Loss of energy
If the rear-stage converting circuit converts to low voltage level, then power conversion loss is reduced, but the ability to provide sufficient driving voltage may be compromised
Solution Approach 1:
The circuit merges the input voltage and the compensating voltage from the rear-stage converting circuit to produce the driving voltage for the LED string. This combining approach allows the rear-stage circuit to operate at low voltage levels (reducing power conversion loss) while still achieving the required driving voltage through the voltage combination.
Solution Approach 2:
The control circuit dynamically adjusts the compensating voltage parameter to ensure that the sum of input voltage and compensating voltage maintains the required driving voltage level, while the rear-stage circuit operates at optimized low voltage levels to minimize power conversion loss.
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 significantly reduces power conversion loss and enhances operating efficiency while using cost-effective, low pressure-resistant components in the rear-stage converting circuit, effectively addressing the inefficiencies of conventional power supply circuits for LEDs.
Implementation Method 1
The rear-stage converting circuit is used for receiving the input voltage and converting the input voltage into a compensating voltage
Implementation Method 2
The control circuit is connected to the rear-stage converting circuit and the LED string for detecting the magnitude of a current passing through the LED string
Implementation Method 3
light emitting diodes (LEDs) capable of emitting light with high luminance and high illuminating efficiency have been developed
Data Source
AI summary
A power supply circuit for receiving an input voltage and outputting a driving voltage to at least one LED string. The power supply circuit includes a rear-stage converting circuit and a control circuit. The rear-stage converting circuit is used for receiving the input voltage and converting the input voltage into a compensating voltage. The control circuit is connected to the rear-stage converting circuit and the LED string for detecting the magnitude of a current passing through the LED string, thereby controlling the current passing through the LED string to be identical. The driving voltage is outputted from the power supply circuit. The driving voltage is a summation of the input voltage and the compensating voltage.