LED Voltage Driver Circuit with Floating Ground and Input Capacitor
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Solution Overview
Problem
Conventional LED driver circuits suffer from low power conversion efficiency and complexity due to their control methods, making it difficult to efficiently supply power to LEDs.
Innovation Solution
An LED voltage driver circuit with a buck converter circuit and a floating ground terminal, where an input capacitor is charged by the voltage difference between the input and ground terminals, and the charged voltage is supplied to the buck converter, allowing for a higher duty ratio and improved efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If conventional control methods (transformer constant current output, boost circuit, constant current circuit) are used to drive LED, then LED can be controlled to light, but power conversion efficiency is lowered and circuit complexity increases
Solution Approach 1:
The patent extracts and eliminates the complex control circuits (transformer constant current output stage, boost circuit, constant current circuit) from the LED driver system. By using a simple voltage driver circuit that directly drives the LED without these intermediate control stages, the invention achieves both reduced circuit complexity and improved power conversion efficiency, as the removed circuits were sources of energy loss and complexity.
2Loss of energy
If conventional control methods are used to drive LED, then LED lighting function is achieved, but power conversion efficiency decreases
Solution Approach 1:
The patent implements continuous useful action by using a voltage driver circuit that maintains steady voltage supply to the LED without the intermittent switching and regulation stages of conventional methods. The circuit continuously charges the input capacitor and supplies power through the switching element without unnecessary conversion stages, ensuring continuous efficient power transfer and avoiding energy losses associated with multiple conversion stages.
3Device complexity
If conventional control methods are used, then LED can be driven, but the circuit becomes complicated
Solution Approach 1:
The patent segments the LED driver circuit into simple, functional modules: input capacitor for voltage storage, switching element for power conversion, and LED connection. This segmentation creates a clear, maintainable circuit structure with fewer components that are easier to manufacture and assemble, thereby improving manufacturing precision and circuit reliability while reducing overall complexity.
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 proposed solution enhances the efficiency and operability of LED driving by increasing the duty ratio, leading to better power conversion efficiency and circuit stability.
Implementation Method 1
an input capacitor whose one end is connected to the input terminal and the other end, which is different from the one end, is connected to the ground terminal, wherein the input capacitor is charged by a voltage difference between the voltage applied to the input terminal and a voltage of the ground terminal
Data Source
AI summary
A light emitting diode (LED) voltage driver circuit includes an input terminal to which a voltage is applied, a ground terminal, an input capacitor whose one end is connected to the input terminal and the other end, which is different from the one end, is connected to the ground terminal, wherein the input capacitor is charged by a voltage difference between the voltage applied to the input terminal and a voltage of the ground terminal, and a buck converter circuit connected to the input capacitor and the input terminal and configured to output power to an LED, wherein the voltage charged in the input capacitor is supplied as an input voltage of the buck converter circuit.