LED Driver Circuit Adjusts Color Temperature via Switch Timing
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Solution Overview
Problem
Conventional LED driving circuits lack user-adjustable light output, requiring external apparatuses for dimming, which increases costs and complexity.
Innovation Solution
A driving circuit with a power converter and a color temperature controller that adjusts the light source's color temperature based on a switch monitoring signal, allowing for user-controlled light output adjustment through a power switch, eliminating the need for external dimming devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional LED driving circuits use a predetermined light output setting, then the circuit structure is simple, but the user cannot adjust the light output level
Solution Approach 1:
The power switch is made multi-functional by enabling it to perform both its traditional power control function and a dimming function. The controller detects the turning-on duration of the power switch and uses this information to automatically set different light output levels, allowing a single component to serve multiple purposes without requiring additional dedicated dimming apparatus.
Solution Approach 2:
The system performs self-dimming by automatically detecting the power switch operation duration and autonomously adjusting the light output level accordingly. The controller monitors the power switch state and self-regulates the LED string current without requiring external dimming devices or user intervention beyond the initial power switch operation.
2Adaptability or versatility
If external dimming apparatus is used to control light output, then light output adjustment is achieved, but costs and device complexity increase
Solution Approach 1:
The dimming function is merged with the existing power switch and controller. Instead of using separate external dimming apparatus, the invention integrates the dimming control capability into the power control pathway by having the controller monitor power switch operation characteristics and automatically adjust light output based on these characteristics.
Solution Approach 2:
The existing power switch and controller are made multi-functional. The power switch not only controls power delivery but also provides dimming information through its operation duration. The controller not only manages power conversion but also detects power switch timing and automatically adjusts light output, eliminating the need for dedicated dimming devices.
3Device complexity
If a power switch operation duration is used to control light output, then no external dimming device is needed, but the control mechanism becomes more complex
Solution Approach 1:
The controller implements a feedback mechanism by continuously monitoring the power switch operation state and using this feedback information to automatically adjust the light output level. The controller detects when the power switch is turned on, measures the duration, and uses this feedback to set the appropriate dimming level for the LED string.
Solution Approach 2:
The system performs self-dimming by automatically detecting the power switch operation characteristics and autonomously adjusting the light output level accordingly. The controller monitors the power switch state and self-regulates the LED string current without requiring external dimming devices or user intervention beyond the initial power switch operation.
Data Source
AI summary
A driving circuit for driving a light source having an adjustable color temperature is provided. The driving circuit includes a power converter, coupled between a power source and the light source and operable for receiving power from the power source and for providing a regulated power to the light source; and a color temperature controller, coupled to the power converter and operable for receiving a switch monitoring signal indicative of an operation of a power switch coupled between the power source and the power converter, and for adjusting the color temperature of the light source based on the switch monitoring signal.