LED Driver Control Unit Dynamic Reference Voltage Adjustment
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Solution Overview
Problem
Current LED drivers face inefficiencies due to fixed reference voltages, leading to suboptimal performance under light load conditions, inability to independently protect each path load in multi-path applications, and limited dimming range, resulting in excessive power consumption and inadequate protection.
Innovation Solution
The electronic device incorporates a voltage conversion unit, current adjusting units, and a control unit that dynamically adjusts current reference signals and generates control signals based on voltage reference signals to optimize power usage, enabling independent protection of each path load and expanding dimming capabilities through supplementary current control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a fixed reference voltage is used in the linear constant current circuit, then the circuit structure is simple, but the driver efficiency cannot be optimized under light load condition
Solution Approach 1:
The patent applies dynamics by replacing the fixed reference voltage with a dynamically adjustable reference voltage that changes according to the load current. The control unit adjusts the reference voltage in real-time to match the actual lighting conditions, enabling the linear constant current circuit to operate efficiently under both heavy and light load conditions while maintaining simple circuit structure.
2Reliability
If the output voltage is stopped when short-circuit occurs, then the circuit is protected, but the other path loads are affected in multi-path configuration
Solution Approach 1:
The patent applies segmentation by dividing the multi-path load system into independent protected zones. Each path load is equipped with its own protection mechanism that can independently detect and respond to short-circuit conditions. When a short-circuit occurs in one path, only that specific path is protected while other paths continue to operate normally, achieving both circuit protection and operational continuity.
3Device complexity
If the reference voltage is fixed, then the control is simple, but the dimming range is limited
Solution Approach 1:
The patent applies parameter changes by making the reference voltage a variable parameter rather than a fixed value. The control unit dynamically adjusts the reference voltage parameter according to the desired dimming level and actual load conditions, enabling a wide dimming range from 0 to 100% while maintaining simple control through automated parameter adjustment based on feedback signals.
Data Source
AI summary
An electronic device comprises a voltage conversion unit, a first load unit, a current adjusting unit, and a control unit. The voltage conversion unit is configured to transfer an input voltage to an output voltage. The current adjusting unit electrically is coupled with the second terminal of the load unit. The current adjusting unit is configured to control a first driving current flowing through the first load unit according to a first current reference signal. The control unit is electrically coupled with the first load unit and the voltage conversion unit. The control unit is configured to generate a first voltage reference signal according to the first current reference signal and generate a first control signal to the voltage conversion unit according to a voltage of the second terminal of the first load unit and the first voltage reference signal.