Display Backlight Power Circuit With Dual LLC Windings
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Solution Overview
Problem
The existing power supply circuits for display apparatuses face challenges with high cost and complexity due to large voltage stress on components, occupying a significant PCB area, and the need for additional windings or diodes to achieve stepped power supply for LED light bars, leading to increased costs and structural complexity.
Innovation Solution
The proposed power supply circuit employs an LLC module with multiple secondary windings to generate different voltages, allowing for adjustable voltage outputs through a voltage adjustment module, reducing the stress on components and eliminating the need for additional windings or diodes, thereby simplifying the circuit and reducing costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a voltage adjustment module is used to handle high voltage stress for LED light bars, then the voltage conversion function is achieved, but the PCB area occupied by the voltage adjustment module increases and the cost increases
Solution Approach 1:
The patent divides the voltage conversion function into two separate LLC secondary windings: one dedicated to LED light bars and another for backlight modules. This segmentation allows each winding to operate at optimized voltage levels, reducing the voltage stress on the voltage adjustment module and enabling miniaturization of the module, thereby decreasing the PCB area it occupies.
Solution Approach 2:
The patent changes the voltage parameter distribution by introducing a second LLC secondary winding that directly provides voltage to backlight modules. This parameter change reduces the voltage burden on the voltage adjustment module, allowing it to be designed with smaller components and lower voltage ratings, thus reducing its PCB footprint and cost.
2Adaptability or versatility
If additional windings or diodes are added to the LLC module to achieve stepped power supply, then the power supply function is improved, but the structure becomes more complicated
Solution Approach 1:
The patent segments the power supply function by adding a second LLC secondary winding specifically dedicated to backlight modules. This segmentation enables independent voltage optimization for different loads (LED light bars vs. backlight modules) without requiring complex additional windings or diodes, thus achieving stepped power supply while maintaining circuit simplicity.
3Adaptability or versatility
If the voltage adjustment module is designed to handle high voltage stress, then the voltage conversion range is sufficient, but the cost of the power supply circuit increases
Solution Approach 1:
The patent segments the voltage conversion tasks between two LLC secondary windings, allowing the voltage adjustment module to handle only the voltage difference required for LED light bars rather than the full voltage range. This segmentation enables the use of lower-cost components with reduced voltage ratings, thereby decreasing the overall power supply circuit cost while maintaining sufficient voltage conversion capability.
Solution Approach 2:
The patent changes the voltage parameter distribution by introducing a second LLC secondary winding that directly supplies voltage to backlight modules. This parameter change reduces the voltage stress requirements for the voltage adjustment module, allowing the selection of lower-cost components with appropriate voltage ratings, thus reducing the overall manufacturing cost of the power supply circuit.
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 solution effectively reduces the PCB area required for the power supply circuit, lowers costs, and enhances efficiency by allowing flexible voltage settings, improving the overall power supply efficiency and reducing the complexity of the power supply circuit.
Implementation Method 1
The power supply circuit includes an LLC primary winding, a first resonant converter (LLC) secondary winding and a second LLC secondary winding, where the first LLC secondary winding is configured to convert a voltage of the LLC primary winding into a first voltage
Data Source
AI summary
A display apparatus and a display control method are disclosed. The display apparatus includes a backlight module and a display panel. The backlight module comprises a controller, a plurality of power sources, and a plurality of lamp areas corresponding to the plurality of power sources. The plurality of power sources include a first power source for providing a positive power supply signal to the controller and driving a lamp area, and a second power source for driving a lamp area. The plurality of power sources are configured to output negative power supply signals and negative reference signals; the controller is configured to output a driving signal through negative voltage driving based on a control signal, the negative power supply signals and the negative reference signals.