Double-output LED Light-modulating Circuit with Twin-bus Framework
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Solution Overview
Problem
Conventional switch LED driving circuits are complex and inefficient due to separate power factor correction and DC/DC conversion units, leading to high component count and low power conversion efficiency.
Innovation Solution
A double-output high-efficiency LED light-modulating circuit utilizing a single-stage flyback power factor corrector and a twin-bus light modulation framework, which reduces the cross voltage of the power switch, allowing for a lower Rds power switch and increased switching speed, and includes a DC/DC converter and an LED module for high-frequency and low-frequency light modulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate power factor correction unit and DC/DC converting unit are used, then power factor correction effect and output voltage modulation capability are improved, but circuit complexity and device area increase
Solution Approach 1:
The patent combines the power factor correction unit and DC/DC converting unit into a single integrated circuit structure. The power factor correction unit includes a boost converter, and the DC/DC converting unit shares common components with the power factor correction unit, thereby reducing the overall number of components and simplifying the circuit while maintaining both power factor correction and output voltage modulation capabilities.
2Reliability
If separate power factor correction unit and DC/DC converting unit are used, then power factor correction effect and output voltage modulation capability are improved, but power conversion efficiency decreases
Solution Approach 1:
The patent combines the power factor correction unit and DC/DC converting unit into a single integrated circuit structure. The power factor correction unit includes a boost converter, and the DC/DC converting unit shares common components with the power factor correction unit, thereby reducing the overall number of components and simplifying the circuit while maintaining both power factor correction and output voltage modulation capabilities.
3Speed
If higher Rds power switch is used in back-end DC/DC convertor, then switching speed increases, but switching losses increase
Solution Approach 1:
The patent changes the voltage parameter by providing a first LED voltage and a second LED voltage that is slightly smaller than the first LED voltage. This voltage parameter change reduces the cross voltage of the power switch in the back-end DC/DC convertor, enabling the use of power switches with lower Rds that have both high switching speed and low switching losses.
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 reduces the complexity and component count of the LED luminaire controlling circuit, increases power conversion efficiency, and enables faster switching with lower switching losses by using a single-stage flyback power factor corrector and a twin-bus modulation framework.
Implementation Method 1
a single-stage flyback power factor corrector, coupled to an AC input voltage signal and capable of outputting a first LED voltage and a second LED voltage
Implementation Method 2
an LED module, coupled to the DC/DC convertor and the single-stage flyback power factor corrector
Data Source
AI summary
The present invention relates to a double-output high-efficiency LED light-modulating circuit, comprising: a single-stage flyback power factor corrector, a DC/DC convertor, an LED module, and a light-modulating switch. In the present invention, it mainly utilizes the single-stage flyback power factor corrector for carrying out the purposes of reducing the components of an LED luminaire controlling circuit and increasing the circuit power conversion efficiency. Moreover, the double-output high-efficiency LED light-modulating circuit further includes a twin-bus light modulation framework, which can not only reduce the cross voltage of the power switch in back-end DC/DC convertor, but also process a high-frequency light modulation and a low-frequency light modulation to the LED luminaire. Therefore, because the cross voltage of the power switch has been reduced, a power switch with lower Rds can be used in the back-end DC/DC convertor for increasing switching speed and reducing switching losses.