Light Driving Circuit Single Control Unit LED Current Regulation
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Solution Overview
Problem
Traditional light driving circuits for multiple LED strings require multiple buck converters and control circuits, leading to complex structures and increased manufacturing costs as the number of LED units increases.
Innovation Solution
A light driving circuit that uses a single control unit to manage and drive multiple LED units without the need for individual buck converters, employing switching units and a control unit to regulate output currents and adjust switching times based on feedback signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If multiple buck converters and control circuits are used to drive multiple LED strings, then each LED unit can be independently controlled, but the circuit structure becomes complex and manufacturing cost increases
Solution Approach 1:
The patent merges multiple independent buck converters and control circuits into a single integrated driving circuit. The circuit uses one control unit that generates control signals for multiple switching elements (Q1-Q4) to drive multiple LED strings (first, second, third LED strings) simultaneously. This consolidation maintains the independent control capability of each LED unit while significantly simplifying the overall circuit structure and reducing manufacturing cost.
Solution Approach 2:
The driving circuit employs a universal control unit that can control multiple switching elements and drive multiple LED strings through a single power conversion stage. The control unit generates PWM signals that regulate the current to each LED string independently, making the circuit multi-functional while avoiding the need for separate buck converters for each LED unit.
2Adaptability or versatility
If multiple buck converters are disposed for multiple illuminant units, then each unit can be driven independently, but the manufacturing cost increases
Solution Approach 1:
The patent combines multiple independent driving functions into a single integrated circuit. Instead of disposing separate buck converters for each illuminant unit, the circuit uses one power conversion stage with multiple switching elements controlled by a single control unit, thereby maintaining independent driving capability while reducing component count and manufacturing cost.
Solution Approach 2:
The driving circuit is designed as a universal platform that can drive multiple types of illuminant units (LED strings with different forward voltages and current requirements) through a single control unit that adapts its output to meet the specific requirements of each connected unit.
3Device complexity
If a single control unit controls multiple LED units, then the circuit structure is simplified, but control precision for each unit must be maintained
Solution Approach 1:
The patent incorporates feedback mechanisms where the control unit monitors the current through each LED string and adjusts the PWM duty cycle accordingly. Current sensing resistors or Hall effect sensors provide feedback signals to the control unit, enabling precise regulation of current to each LED unit despite the simplified single-control-unit architecture.
Solution Approach 2:
The control unit internally segments the control process for each LED string, generating separate PWM control signals for each switching element (Q1-Q4) based on the specific requirements of each LED unit. This internal segmentation maintains control precision for each unit while using a single physical control unit.
Data Source
AI summary
A light driving circuit includes a first and second illuminant unit, a power conversion unit, a first and second switching unit, and a first control unit. The power conversion unit receives an input voltage and converts the input voltage into an output voltage. The first switching unit is coupled to the first illuminant unit. When the first switching unit is turned on, the first illuminant unit is driven by the output voltage to emit light and generate a first output current. The second switching unit is coupled to the second illuminant unit. When the second switching unit is turned on, the second illuminant unit is driven by the output voltage to emit light and generate a second output current. The first control unit controls the first switching unit and the second switching unit to be turned on/off according to the first output current and the second current, respectively.