LED Driving Circuit Feedback Control for Lower Transistor Power Loss
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Solution Overview
Problem
Conventional LED driving technologies operating in the saturation region of a current-controlling transistor result in higher power consumption due to increased drain-source voltage.
Innovation Solution
The electronic circuitry and device employ a transistor operated within a first region of its characteristic curve, where the output conductance is higher than in a second region, to regulate the driving current and reduce power consumption. This is achieved through a driving circuit with a detecting unit and a feedback-control unit that adjusts the transistor's operation to maintain efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the transistor is operated in the saturation region to regulate LED driving current, then the driving current remains constant despite LED characteristic variations, but the drain-source voltage increases leading to higher power consumption
Solution Approach 1:
The patent dynamically switches the transistor between saturation region operation (for current stability) and non-saturation region operation (for lower power consumption) based on real-time detection of LED characteristics. This dynamic adaptation allows the system to maintain driving current constancy when needed while reducing power consumption when LED characteristics are stable, resolving the contradiction between reliability and energy efficiency
Solution Approach 2:
The patent implements a feedback mechanism where the detection unit monitors LED characteristics and provides information to the control unit, which then adjusts the transistor's operation region accordingly. This closed-loop feedback system enables the transistor to operate in the saturation region only when LED characteristic variations require current stabilization, otherwise operating in the non-saturation region to minimize power consumption, thus balancing current constancy with energy efficiency
Data Source
AI summary
An electronic circuitry and an electronic device. The electronic circuitry includes a plurality of light-emitting components and a plurality of driving circuits corresponding to the light-emitting components. The driving circuit includes a transistor for delivering a driving signal to a corresponding light-emitting component, a detecting unit for providing a detecting output in response to the corresponding light-emitting component, and a feedback-control unit for directing the transistor to regulate the driving signal in response to the detecting output.