LED Lighting System Peak Current Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing LED lighting systems lack efficient control over the peak value of the primary current supplied to LEDs, which affects the amount of current delivered.
Innovation Solution
The proposed LED lighting system incorporates a main transformer, a voltage detector, a current controller with multiple voltage storage components, and a power factor compensation circuit to control the peak value of the primary current by adjusting the duty ratio of the driving signal based on the level of the current control signal and reference voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a transformer circuit supplies current to LEDs without peak current control, then the circuit is simple, but the amount of current supplied to LEDs cannot be efficiently controlled
Solution Approach 1:
The patent implements feedback control by detecting the primary current peak value through a current detector and using this information to adjust the driving signal duty ratio via a power factor compensation circuit. This closed-loop feedback mechanism enables efficient current control while maintaining reasonable circuit complexity through automated regulation.
Solution Approach 2:
The patent replaces complex mechanical or analog current control mechanisms with electronic control circuits including voltage storage elements, negative voltage appliers, and digital signal processing components. This substitution enables more precise and efficient current control through electronic regulation rather than mechanical adjustment.
2Reliability
If the primary current peak value is not controlled, then the circuit operation is simple, but the current supplied to LEDs becomes unstable
Solution Approach 1:
The current detector continuously monitors the primary current and feeds this information back to the power factor compensation circuit, which adjusts the driving signal to maintain stable current levels. This feedback loop ensures reliable and stable current supply to LEDs despite variations in input voltage or load conditions.
Solution Approach 2:
The patent controls the duty ratio of the driving signal as a variable parameter to regulate the primary current peak value. By dynamically changing this temporal parameter rather than adjusting voltage or current directly, the system achieves stable current control with reduced circuit complexity.
3Measurement precision
If multiple voltage storage and control components are added to control peak current, then current control precision improves, but device complexity increases
Solution Approach 1:
The control circuit is segmented into distinct functional modules: voltage storage elements for energy management, negative voltage applier for voltage regulation, current detector for measurement, and power factor compensation circuit for control. This segmentation allows each component to perform a specific function with high precision while keeping the overall system manageable through modular architecture.
Solution Approach 2:
The patent uses multiple voltage storage elements to store and release energy at different stages of the switching cycle, enabling precise control of the primary current waveform. By controlling the timing and amount of energy storage and release through parameter adjustment rather than component count alone, the system achieves high control precision.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution efficiently controls the amount of current supplied to LEDs by managing the peak value of the primary current in the transformer circuit, enhancing the overall performance of the LED lighting system.
Implementation Method 1
a main transformer transforming an input signal to supply the transformed input signal to an LED group
Implementation Method 2
a voltage detector supplying a control voltage proportional to a level of an input voltage corresponding to the input signal
Implementation Method 3
a first voltage storage storing the control voltage supplied from the voltage detector or discharging a stored voltage
Implementation Method 4
a second voltage storage connected to the first voltage storage, and storing the control voltage applied through the first voltage storage or discharging a stored voltage
Data Source
AI summary
An LED lighting system is provided. The LED lighting system includes a main transformer, a voltage detector, a current controller, a second reference voltage supplier, and a power factor compensation circuit. The main transformer transforms an input signal to supply the transformed input signal to an LED group. The voltage detector supplies a control voltage proportional to a level of an input voltage corresponding to the input signal. The current controller includes a first voltage storage, a negative voltage applier, a second voltage storage, switch, and a current control signal generator. The first voltage storage stores the control voltage supplied from the voltage detector or discharges a stored voltage. The negative voltage applier is connected to the first voltage storage, and connected to a ground to apply the control voltage to the ground when the control voltage is a negative voltage. The second voltage storage is connected to the first voltage storage, and stores the control voltage applied through the first voltage storage or discharges a stored voltage. The switch is connected to the second voltage storage, and activated by a driving signal to apply a ground voltage to the second voltage storage. The current control signal generator generates a current control signal according to a voltage signal and gain of the second voltage storage. The first voltage storage or the second voltage storage supplies the current control signal through the voltage detector. The second reference voltage supplier supplies the second reference voltage when the control signal supplied from the voltage detector is equal to or greater than the second reference voltage. The power factor compensation circuit controls a duty ratio of the driving signal according to a level of the current control signal, and controls a peak value of a primary current in the main transformer according to a level of the second reference voltage.