LED Driver Controller Current Regulation Voltage Sensing
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Solution Overview
Problem
Existing LED light source driving systems consume excessive power to adjust brightness, leading to reduced power efficiency due to the need to adjust output voltage and current.
Innovation Solution
A controller and system that utilize a power converter to generate two output voltages, where one powers the LED and the other powers system components, with a control circuit that senses and adjusts these voltages and currents to maintain a target current value within a preset voltage range, reducing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the system adjusts output voltage to control LED brightness, then brightness control is achieved, but power consumption increases and power efficiency decreases
Solution Approach 1:
The patent changes the control parameter from voltage adjustment to current adjustment. By maintaining a constant voltage output and adjusting only the current to the LED, the system achieves brightness control without the power losses associated with voltage regulation. The controller monitors LED current and adjusts it to match a target current value, thereby controlling brightness while minimizing power consumption.
2Illumination intensity
If the system adjusts output voltage to control LED brightness, then brightness control is achieved, but power efficiency decreases
Solution Approach 1:
The patent changes the control parameter from voltage adjustment to current adjustment. By maintaining a constant voltage output and adjusting only the current to the LED, the system achieves brightness control without the power losses associated with voltage regulation. The controller monitors LED current and adjusts it to match a target current value, thereby controlling brightness while minimizing power consumption.
3Measurement precision
If the controller senses and adjusts both output voltages and LED current, then precise control is achieved, but system complexity increases
Solution Approach 1:
The patent segments the control functions into distinct parts: voltage sensing (for the second output voltage), current sensing (for the LED current), and control signal generation. The controller is divided into separate sensing units and control units that handle specific tasks independently. This modular segmentation allows precise multi-parameter control while managing system complexity through functional decomposition.
Solution Approach 2:
The patent implements feedback mechanisms where the controller continuously senses the second output voltage and LED current, compares them against target values, and adjusts control signals accordingly. The feedback loop ensures precise control by constantly monitoring and correcting deviations from desired operating parameters, achieving high measurement and control precision.
Data Source
AI summary
A controller includes a voltage detection terminal, a current detection terminal and a voltage sensing terminal. The voltage detection terminal senses a second output voltage. The current detection terminal senses a current of a light source. The second output voltage is sensed prior to the current of the light source. The voltage sensing terminal receives a voltage sensing signal indicative of a first output voltage. The controller adjusts the voltage sensing signal based on the second output voltage, to enable the second output voltage in a preset voltage range; when the second output voltage is in the preset voltage range, the controller adjusts the adjusted voltage sensing signal based on a difference between the current of the light source and a target current value, to enable the current of the light source to maintain the target current value.