LED Linear Regulator Circuit Power Factor Improvement
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Solution Overview
Problem
Traditional LED linear regulators suffer from insufficient light output and excessive flicker noise due to low power factor, leading to inefficiencies in LED lighting applications.
Innovation Solution
An LED linear regulator circuit that includes a rectifier, a capacitor, a plurality of LEDs, a current limiter, and a current controller, where the capacitor serves as a capacitive load to improve light output and minimize flicker noise by aligning the phases of input current and voltage, thereby increasing the power factor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If traditional LED linear regulators are used, then the circuit structure is simple, but the power factor is low and flicker noise is excessive
Solution Approach 1:
The patent introduces a capacitor as an intermediary component between the rectifier and LEDs. This capacitor serves as a capacitive load that improves power factor and reduces flicker noise by smoothing the current waveform, thereby resolving the contradiction between simple circuit structure and harmful flicker noise generation.
2Ease of manufacture
If traditional LED linear regulators are used, then the circuit structure is simple, but the total light output is insufficient
Solution Approach 1:
The capacitor acts as an intermediary energy storage element that maintains more consistent current flow to the LEDs throughout the AC cycle. This improves the utilization of the AC power source, increasing total light output while keeping the circuit structure relatively simple.
3Object-generated harmful factors
If a capacitor is added to improve power factor, then the power factor increases and flicker noise is reduced, but the device complexity increases
Solution Approach 1:
The patent uses a single capacitor as an intermediary component that provides multiple benefits: improving power factor, reducing flicker noise, and increasing light output. This single component approach minimizes the increase in device complexity while achieving multiple performance improvements simultaneously.
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
The solution enhances the power factor and efficiency of the LED linear regulator, ensuring consistent light output and reducing flicker noise issues, while being easy to implement and cost-effective.
Implementation Method 1
a capacitor coupled to the rectifier; wherein: the device has a first current path during a first period of operation and a second current path during a second period of operation; and the capacitor charges during the first period of operation and discharges during the second period of operation
Data Source
AI summary
The present disclosure involves a device. The device includes a rectifier coupled to receive energy from an alternating current (AC) voltage source. A capacitor is coupled to the rectifier. A plurality of LEDs and a current limiter are coupled in series. The current limiter is configured to limit a current through the LEDs. The plurality of LEDs and the current limiter are collectively coupled to the capacitor in parallel. A current controller is coupled to both the capacitor and the current limiter in series. The current controller is configured to control at least a charging current of the capacitor. The device has a first current path during a first period of operation and a second current path during a second period of operation. The capacitor charges during the first period of operation and discharges during the second period of operation.