Integrated LED Current Control Circuit for Voltage Fluctuation Stability
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Solution Overview
Problem
Existing methods for controlling LED load brightness are either complex and costly or suffer from heat generation issues, particularly when dealing with voltage fluctuations, necessitating a solution that can supply a constant current efficiently and reduce circuit complexity.
Innovation Solution
An apparatus comprising a power supply, a driving circuit, and a control circuit connected to the load, where the control circuit includes transistors and resistance elements to manage current based on voltage levels, allowing for constant current supply without additional circuits, thereby reducing costs and simplifying the circuit configuration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a switching control method is used to maintain constant brightness regardless of voltage fluctuation, then brightness stability is improved, but circuit complexity and design cost increase
Solution Approach 1:
The patent merges the control circuit and driving circuit into a single integrated circuit structure. The control circuit includes a transistor whose gate is connected to the driving circuit, allowing the two functions to be combined in one device rather than using separate switching control components, thereby reducing circuit complexity while maintaining brightness stability
Solution Approach 2:
The integrated circuit performs multiple functions simultaneously: it acts as both a control circuit (regulating current based on voltage fluctuations) and a driving circuit (directly driving the LED load). This multi-functionality eliminates the need for separate switching control components, reducing overall circuit complexity while maintaining constant brightness
2Device complexity
If a linear control method is used to maintain constant brightness with simple circuit structure, then circuit simplicity is improved, but heat generation increases requiring larger PCB area
Solution Approach 1:
The patent combines control and driving functions in one integrated circuit, eliminating the need for separate linear control components that would generate heat. The integrated structure reduces overall heat generation while maintaining circuit simplicity
Solution Approach 2:
The patent changes the operating parameters of the transistor in the integrated circuit to optimize current regulation efficiency. By adjusting the transistor's gate voltage based on detected voltage fluctuations, the circuit maintains constant current with reduced power loss and heat generation compared to traditional linear control methods
3Stability of the object's composition
If a linear control method is used to maintain constant brightness, then power stability is improved, but the current supply capability for each LED package is fixed
Solution Approach 1:
The patent makes the circuit adaptable to different LED packages by allowing dynamic adjustment of current supply capability. The integrated circuit can be configured with different transistor parameters and resistance values to match different LED package requirements, enabling the same circuit design to adapt to various current demands while maintaining power stability
Data Source
AI summary
An apparatus for controlling electric current includes a power supply for supplying a voltage, a driving circuit for receiving the voltage from the power supply to supply a first current to a load electrically connected thereto, and a control circuit electrically connected to the load and the driving circuit and for receiving the voltage from the power supply to supply a second current to the load.