Shared-Power LED Driver Circuit for Main Light and Nightlight
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The existing triode for alternating current dimmable downlights with a night light function require two independent power supply systems, increasing circuit complexity and complicating miniaturization, which is a limitation in ultra-thin or compact design applications.
Innovation Solution
A driving circuit that integrates a power control chip, rectifier bridge, and switching transistors to share a power supply for both main lighting and nightlight lighting, using a current limiting resistor to reduce current flow and transistor withstand voltage to achieve nightlight functionality without separate power circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If two independent power supply systems are used for main lighting and night light, then the lighting functions can be independently controlled, but the circuit complexity increases and miniaturization becomes difficult
Solution Approach 1:
The patent merges the power supply systems for main lighting and night light into a single integrated power supply circuit. The rectifier bridge and power control chip serve both lighting functions simultaneously, eliminating the need for separate power supply circuits while maintaining independent control capabilities through the control chip's ability to selectively activate different LED groups.
Solution Approach 2:
The single power supply circuit is designed to serve multiple functions - it can supply power to both the main lighting LED group and the night light LED group. The power control chip and rectifier bridge act as universal power distribution components that can dynamically allocate power to different loads based on control signals, enabling one power supply system to replace two independent systems.
2Adaptability or versatility
If two independent power supply systems are used for main lighting and night light, then the lighting functions can be independently controlled, but production challenges increase and miniaturization is complicated
Solution Approach 1:
By combining the power supply circuits into a single integrated system, the number of components that need to be manufactured and assembled is reduced. The single power supply design simplifies the production process, reduces assembly steps, and enables easier miniaturization of the overall downlight fixture while maintaining the dual-function capability.
3Device complexity
If a current limiting resistor is used to reduce current for nightlight, then the brightness is reduced for nightlight function, but the circuit becomes simpler with shared power supply
Solution Approach 1:
The patent uses a current limiting resistor to change the electrical parameter (current) flowing to the night light LED group, thereby controlling the brightness level. By adjusting the resistance value, the current is limited to produce the desired dim lighting effect suitable for nightlight function, while the same resistor also simplifies the overall circuit design by enabling direct connection to the shared power supply without requiring separate power circuitry.
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
Reduces circuit complexity and cost by sharing a power supply, allowing for compact designs and lower transistor voltage requirements, thus simplifying production and reducing material costs.
Implementation Method 1
a rectifier bridge, wherein an alternating current input end of the rectifier bridge is connected to mains electricity, and a direct current output end of the rectifier bridge is connected to a positive electrode of the first LED light source
Implementation Method 2
The present disclosure provides the driving circuit for lighting and nightlight lighting, which reduces the current flowing through the second LED light source by adopting the current limiting resistor
Implementation Method 3
a first light-emitting diode (LED) light source, and a second LED light source
Implementation Method 4
the first LED light source and the second LED light source can be directly connected to a positive terminal of the direct current output end of the rectifier bridge
Data Source
AI summary
A driving circuit for lighting and nightlight lighting comprising a power control chip, a control chip, a rectifier bridge, a first LED light source, and a second LED light source. An alternating current input end of the rectifier bridge is connected to mains electricity, and a direct current output end of the rectifier bridge is connected to a positive electrode of the first LED light source. The direct current output end of the rectifier bridge is connected to a positive electrode of the second LED light source through a current limiting resistor, and negative electrodes of the first LED light source and the second LED light source are respectively connected to a first switching transistor and a second switching transistor. A signal output end of the control chip is respectively connected to control electrodes of the first switching transistor and the second switching transistor.