LED Module Current Control to Avoid Overcurrent Shutdown
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Solution Overview
Problem
Existing LED light bars may not match power supply specifications, leading to overcurrent protection triggers and non-functional lighting without clear indication of the cause.
Innovation Solution
An LED driving device with a power supply module, switch module, and control module that detects output current and adjusts conduction states to prevent overcurrent protection triggers and provide specification mismatch alerts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If overcurrent protection function is added to power supply, then power supply reliability is improved, but LED module cannot operate when current exceeds threshold
Solution Approach 1:
The control module acts as an intermediary between the power supply module and LED module. It receives overcurrent detection signals from the power supply module and generates appropriate control signals to adjust LED module conduction, preventing overcurrent protection triggering while maintaining LED operation through intermediate control actions.
Solution Approach 2:
The system implements feedback control where the control module continuously monitors overcurrent detection signals from the power supply module and adjusts the conduction state of the LED module accordingly. This closed-loop feedback mechanism ensures the LED module operates within safe current limits while maximizing operational availability.
2Adaptability or versatility
If LED light bar power requirements exceed power supply capability, then user's personalized lighting needs are satisfied, but overcurrent protection is triggered
Solution Approach 1:
The control module dynamically adjusts the conduction state of the LED module based on real-time overcurrent detection signals. This dynamic control allows the system to adapt to different LED power requirements while maintaining power supply stability, enabling users to configure high-power LED setups without triggering protection mechanisms.
3Reliability
If LED module conduction state is adjusted to prevent overcurrent, then power supply protection is maintained, but LED brightness is reduced
Solution Approach 1:
The control module changes the conduction parameters (duty cycle, pulse width) of the LED module to prevent overcurrent while minimizing brightness impact. By optimizing these parameters, the system maintains adequate illumination intensity while ensuring power supply protection is not triggered.
Data Source
AI summary
An LED driving apparatus, a microcontroller, and a control method for an LED module are provided. The LED driving apparatus includes a power supply module, a switch module, and a control module. The power supply module is configured to supply power to the LED module, in which the power supply module determines whether to trigger an overcurrent protection based on whether an output current exceeds a threshold current. The control module is configured to receive an overcurrent detection signal to control a conduction state of the switch module, so as to affect the current amount of the LED module. When the overcurrent detection signal indicates the output current exceeds the threshold current, the control module outputs a first control signal based on the overcurrent detection signal to control the switch module, to prevent the overcurrent protection from being triggered.