RC Delay Turn Signal Circuit for MCU-Free Flowing LEDs
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Solution Overview
Problem
Existing dynamic automotive turn signal systems rely on microcontrollers (MCUs) to generate delays for LED lighting, resulting in high hardware and software costs due to the complexity of programming and peripheral circuits.
Innovation Solution
A dynamic automotive turn signal circuit utilizing external resistors to create a high-precision delay circuit, allowing for flexible adjustment of turn-on and turn-off delays without the need for complex MCU programming, thereby reducing hardware and software costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a microcontroller unit (MCU) is used to generate delay circuits for dynamic turn signals, then the dynamic lighting function can be achieved, but the hardware cost and software development cost increase significantly
Solution Approach 1:
The patent extracts the delay generation function from the MCU and implements it through external RC circuits. Each LED string has its own RC delay circuit that generates the required delay without MCU intervention, thus removing the complex software programming and peripheral circuit requirements while maintaining the dynamic lighting effect
Solution Approach 2:
The RC delay circuits are self-contained and automatically generate the required delay times for each LED string without external control. The circuits use their own resistors and capacitors to create the timing characteristics, eliminating the need for MCU-based software control and reducing overall system complexity
2Device complexity
If external resistors are used to create delay circuits, then hardware and software costs are reduced, but the precision of delay control must be maintained
Solution Approach 1:
The patent applies different resistance values to different LED strings based on their specific requirements. Each RC delay circuit is locally optimized with specific resistor and capacitor values to achieve the precise delay needed for that particular LED string, ensuring accurate timing control across all strings without requiring a complex centralized control system
Solution Approach 2:
The patent controls the delay time by changing the resistance and capacitance parameters of the RC circuits. By selecting appropriate resistor and capacitor values, the delay time for each LED string can be precisely adjusted to meet the 200ms requirement while using simple, low-cost external components instead of expensive MCU hardware
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 achieves dynamic flowing turn signals with high precision, reducing production and maintenance costs while maintaining compliance with regulatory lighting times of 200 ms or less.
Implementation Method 1
a delay unit configured to output control signals at different delays to the plurality of LED drivers
Implementation Method 2
the delay unit may include a first resistor, where a first terminal of the first resistor is connected to the drive control module
Data Source
AI summary
A dynamic automotive turn signal circuit includes at least one drive control module configured to receive a power supply signal from a body control module (BCM) to start operation, where the drive control module outputs first control signals at different delays through a delay unit; and a light emitting diode (LED) light set connected to the drive control module and lit based on the first control signals. A dynamic automotive turn signal system is further provided. The dynamic automotive turn signal circuit and the dynamic automotive turn signal system uses an external resistor to preset a high-precision delay circuit to realize the function of dynamic flowing turn signals. The external resistor can be used to configure a turn-on delay and a turn-off delay of the internal driver chip, such that the channel turn-on time and turn-off time can be flexibly adjusted.