Multi-Output Boost Circuit for LED Backlight Driving
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Solution Overview
Problem
Conventional boost circuits for LED backlight driving in LCDs can only produce a single output voltage, necessitating multiple large-scale energy-saving components and increasing costs, while failing to efficiently supply various operational voltages required by the LED string and other loadings.
Innovation Solution
A boost circuit design incorporating an inductor, a MOS transistor, and multiple switch components that convert a single input voltage into multiple output voltages, utilizing square-wave signals with varying duty ratios to efficiently supply voltage to the LED string and other loadings, reducing the need for large-scale energy-saving components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a single boost circuit is used to generate only one output voltage, then the circuit structure is simple, but it cannot efficiently supply multiple operational voltages required by LED string and other loadings
Solution Approach 1:
The boost circuit is designed to perform multiple functions by generating different output voltages (first output voltage for LED string, second output voltage for other loadings) through a single circuit structure, making the circuit universal for powering multiple types of loads with different voltage requirements
2Adaptability or versatility
If multiple large-scale energy-saving components are used to generate multiple output voltages, then the voltage supply requirement is met, but the component cost increases
Solution Approach 1:
Multiple voltage generation functions that would traditionally require separate large-scale energy-saving components are merged into a single boost circuit, reducing component count and manufacturing cost while maintaining the capability to supply multiple output voltages to different loads
3Manufacturing precision
If multiple separate boost circuits are used for different voltages, then each voltage requirement is precisely met, but the energy consumption increases
Solution Approach 1:
Multiple voltage generation operations are combined into a single boost circuit that processes input voltage once and distributes it to multiple outputs, eliminating redundant energy conversion processes and reducing overall energy consumption while maintaining precise voltage control for each output
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 design allows for the efficient generation of multiple output voltages from a single input voltage, reducing component costs and energy consumption, while ensuring adequate voltage supply to both the LED string and other operational components within the driving circuit.
Implementation Method 1
a boost circuit having one input voltage and a plurality of output voltages... an inductor (L)... a second end of the inductor (L) connects to a drain of the MOS transistor (Q)
Data Source
AI summary
A boost circuit includes an inductor (L), a MOS transistor (Q), and a number “n” of switch components (Q1-Qn) is disclosed. A first end of the inductor (L) receives an input voltage (Vin), and a second end of the inductor (L) connects to a drain of the MOS transistor (Q). A source of the MOS transistor (Q) is electrically grounded, and a gate of the MOS transistor (Q) is driven by one square-wave signals (S). The number “n” of switch components respectively connects to the inductor and respectively outputs a number “n” of output voltages. The number “n” of switch components are driven by a number “n” of square-wave signals (S1-Sn). A duty ratio of the square-wave signals (S) is d, and the duty ratios of the square-wave signals (S1-Sn) are d1-dn. Before a turn-off time of each period of the MOS transistor (Q), the number “n” of square-wave signals (S1-Sn) are driven by a number “n” of switch components (Q1-Qn) in turn. Wherein d1+d2+d3+ . . . +dn=1−d, and n is an integer greater than one. In addition, a LED backlight driving circuit and a liquid crystal device having the above boost circuit are disclosed.