Precision Supply Circuit for Wide-Range LED Current Control
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Solution Overview
Problem
Existing automated control systems face challenges in precisely controlling current and voltage over a wide range for LED-based lighting systems, especially in dynamic environments where conditions change frequently, leading to variations in signal and control requirements.
Innovation Solution
A precision supply circuit is developed, capable of precisely controlling current and voltage over a wide range, using a combination of a precision current controller and a programmable voltage source. This circuit includes feedback mechanisms to adjust current and voltage levels, ensuring efficient energy use and minimizing stress on the load and controller.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional LED lighting systems are used in dynamic environments, then the system can operate with simple control circuits, but the precision and accuracy of current and voltage control deteriorates when conditions change frequently
Solution Approach 1:
The patent implements feedback mechanisms by sensing voltage across the load through a sensing resistor and using the sensed signal to control the switching element. The feedback circuit continuously monitors the current flow and adjusts the switching element's operation to maintain precise current control despite changes in load conditions or environmental factors
Solution Approach 2:
The patent replaces conventional mechanical or simple resistive control methods with an electronic switching element (such as a MOSFET or BJT) controlled by feedback signals. This substitution enables precise electronic control of current flow through the LED load, achieving high measurement precision without requiring complex mechanical adjustment mechanisms
2Illumination intensity
If high current is delivered to LED lamps to increase brightness, then illumination intensity improves, but energy wastage and stress on the load and controller increases
Solution Approach 1:
The patent employs periodic switching action of the controlled switching element to deliver current pulses to the LED load. By controlling the duty cycle and frequency of these periodic current pulses, the system achieves desired illumination intensity while minimizing continuous power dissipation and energy wastage as heat
Solution Approach 2:
The patent dynamically adjusts current parameters (amplitude, pulse width, frequency) based on feedback signals and control inputs. This allows the system to deliver high current when maximum brightness is needed while operating at lower current levels during normal conditions, thereby reducing overall energy wastage and stress on the LED lamps and controller
3Adaptability or versatility
If the supply circuit operates over a wide range of currents and voltages to accommodate varying load requirements, then adaptability improves, but maintaining precision control across the entire range becomes more difficult
Solution Approach 1:
The patent implements dynamic control where the switching element's operation is continuously adjusted based on real-time feedback from the sensing circuit. This dynamic adaptation allows the system to maintain precise current control across a wide operating range by automatically adjusting control parameters in response to changing load conditions, voltage variations, and environmental factors
Data Source
AI summary
A wide current-and-voltage-range, precision supply circuit to conduct current (pulsed or continuous) having precisely-controlled current levels through a load is described. The supply circuit includes selectable current-sensing resistors in a feedback loop that controls current output to accommodate a wide range of currents provided to the load. The circuit can include a programmable output voltage that is applied to the load. The circuit can provide sensed voltage information from a single sensing node in the supply circuit to enable protection of the load and of power transistor(s) that conduct current through the load.