LED Dimming Controller Using On/Off Switch Pattern Detection
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Solution Overview
Problem
Conventional LED driving circuits lack user-adjustable light output, requiring external apparatuses for dimming and limiting flexibility in light intensity control.
Innovation Solution
A dimming controller that operates in either analog or burst dimming modes, using pulse signals and current monitoring to adjust the power to the LED string, allowing for user-controlled light output adjustment through a standard on/off switch.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a conventional LED driving circuit with predetermined light output is used, then the circuit structure is simple, but the user cannot adjust the light intensity
Solution Approach 1:
The patent combines the dimming control functionality with the existing on/off switch by detecting specific switching patterns (e.g., rapid on-off cycles) to initiate dimming mode. This merges two functions (power control and brightness adjustment) into a single device, allowing users to adjust light intensity without adding separate dimming controls.
Solution Approach 2:
The LED driving circuit automatically detects user intent for dimming through the switching pattern of the on/off switch and self-adjusts the light output accordingly. The system monitors the switch operations and autonomously transitions between full brightness and dimmed states without requiring external dimming apparatus or complex user interfaces.
2Adaptability or versatility
If a linear LED current regulator with operational amplifiers is used to control light output, then the light intensity can be adjusted, but a dedicated apparatus with adjusting buttons or remote control is required
Solution Approach 1:
The on/off switch is designed to perform multiple functions: standard on/off control and dimming control. By detecting specific switching patterns (such as rapid toggling within a predetermined time period), the same switch enables brightness adjustment, eliminating the need for separate dimming controls and simplifying the user interface.
Solution Approach 2:
The system automatically detects the user's dimming intent through the switching pattern and self-adjusts the light output. The control circuit monitors switch operations and autonomously transitions between brightness levels without requiring external dimming apparatus or complex user interactions.
3Adaptability or versatility
If additional external dimming apparatus is added to enable light output adjustment, then the light intensity can be controlled, but the device complexity and cost increase
Solution Approach 1:
The patent integrates dimming control functionality into the existing LED driving circuit by utilizing the on/off switch for dual purposes. The control circuit detects specific switching patterns and adjusts the current to the LED string accordingly, merging power control and brightness adjustment into a single integrated system without adding external dimming apparatus.
Solution Approach 2:
The LED driving circuit automatically detects user intent for dimming through the switching pattern of the on/off switch and self-adjusts the light output. The system monitors switch operations and autonomously transitions between full brightness and dimmed states without requiring external dimming apparatus or complex user interfaces.
Data Source
AI summary
A dimming controller can operate in a first mode or a second mode to control dimming of a light-emitting diode (LED) light source. The dimming controller can include a voltage control terminal and a current control terminal. The voltage control terminal provides a pulse signal when the dimming controller operates in the first mode to operate a control switch in either a first state or a second state. A first current flowing through the LED light source increases when the control switch is in the first state and decreases when the control switch is in the second state. The voltage control terminal provides a control signal to the control switch to cut off the first current when the dimming controller operates in the second mode. The current control terminal conducts a second current through the LED light source when the dimming controller operates in the second mode.