LED Power Supply Circuit Simplification via Merging Drivers
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Solution Overview
Problem
Existing LED driving devices have complex circuit structures and inefficiencies due to multiple components, leading to reduced energy efficiency and increased electromagnetic interference.
Innovation Solution
A power supply device incorporating a power factor correcting unit, an insulating DC/DC converter, and a boosting unit with a common inductor and switching elements, which simplifies the circuit and performs power factor correction, allowing for efficient power delivery to LED modules through zero voltage switching.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple individual LEDs with separate current drivers are used in each string, then current deviation between LED strings can be reduced, but the circuit structure becomes complex and energy efficiency decreases
Solution Approach 1:
The patent combines multiple LED strings into a single series connection without individual current drivers for each string. Instead, a single current driver controls the entire series-connected LED array, merging what were previously separate control circuits into one unified system. This reduces circuit complexity while maintaining reliable current control across all LED strings through the series connection topology.
Solution Approach 2:
The single current driver performs the function of what would have been multiple separate current drivers, making it a universal control element for the entire LED array. This multi-functional approach allows one driver to regulate current across all LED strings simultaneously, reducing the total number of components and simplifying the overall circuit structure.
2Reliability
If multiple individual LEDs with separate current drivers are used in each string, then current deviation between LED strings can be reduced, but energy efficiency decreases
Solution Approach 1:
By merging multiple separate current driver circuits into a single current driver that controls the entire series-connected LED array, the patent eliminates redundant circuitry and reduces total power consumption. The series connection ensures uniform current flow through all LEDs without requiring multiple active control elements, thereby improving energy efficiency while maintaining current consistency.
3Ease of operation
If many elements are used in the LED driving device, then current control can be achieved, but the circuit structure becomes complex
Solution Approach 1:
The patent extracts and removes the unnecessary current driver components from the circuit. By recognizing that series-connected LEDs naturally have uniform current flow, the design eliminates the need for multiple current drivers, keeping only the essential single current driver and associated control elements. This extraction of redundant components simplifies the circuit structure while preserving current control functionality.
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 results in a simplified circuit structure with improved energy efficiency and reduced electromagnetic interference, enhancing the overall performance of the LED driving device.
Implementation Method 1
an insulating DC/DC converter unit including a primary winding and a secondary winding magnetically coupled to the primary winding, and inducing a voltage in the secondary winding
Implementation Method 2
a common inductor having one end connected to one end of the secondary winding in series
Implementation Method 3
controlling the accumulation or discharging of energy in the common inductor and boosting a voltage induced in the secondary winding in a first mode through zero voltage switching
Data Source
AI summary
A power supply device may include an insulating DC/DC converter unit including a primary winding and a secondary winding magnetically coupled to the primary winding, and inducing a voltage in the secondary winding in a first direction or a second direction, and a boosting unit. The boosting unit may comprise a first booster boosting the voltage induced in the secondary winding to supply power to a first light emitting diode module, in a first mode in which the voltage is induced in the secondary winding in the first direction, and a second booster boosting the voltage induced in the secondary winding to supply power to a second light emitting diode module, in a second mode in which the voltage is induced in the secondary winding in the second direction.