LED Dimmer On-Time Control Circuit Eliminates Capacitors
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Solution Overview
Problem
Existing LED lighting devices face challenges in efficiently controlling luminance using non-dial-type switches, requiring separate sensing operations and off-time power sources, which complicates the circuit configuration, increases costs, and reduces lifespan due to the need for capacitors for power storage during off-times.
Innovation Solution
An LED dimmer system that controls luminance by measuring power switch on-time to automatically determine and adjust dimming levels, eliminating the need for separate sensing operations and off-time power sources, by using a power switch to select different dimming levels based on user input, and storing dimming levels in a group for sequential control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If separate sensing operations and off-time power sources are used for luminance control, then luminance control capability is improved, but device complexity increases
Solution Approach 1:
The patent merges the sensing operation and power supply functions into a single integrated circuit that operates during the on-time period. The control circuit is configured to perform both sensing and power supply functions without requiring separate components, thereby reducing overall device complexity while maintaining luminance control capability.
Solution Approach 2:
The control circuit is designed to perform multiple functions including sensing operations, power supply during on-time, and dimming control within a single integrated unit. This multi-functional design eliminates the need for separate sensing operations and off-time power sources, directly reducing circuit complexity.
2Use of energy by moving object
If capacitors are used for power storage during off-times, then power supply capability is improved, but lifespan decreases
Solution Approach 1:
The patent extracts and eliminates the capacitor component from the circuit by designing a power supply mechanism that operates only during the on-time period. The control circuit is configured to perform power supply functions while the power switch is on, removing the need for capacitors to store energy during off-times, thereby extending the lifespan of the lighting device.
Solution Approach 2:
The invention replaces the durable but lifespan-limiting capacitor with a simpler power supply approach that uses the existing power switch and control circuit during on-time periods. This eliminates the need for long-lasting energy storage components, achieving a balance between power supply capability and device lifespan.
3Measurement precision
If separate sensing operations are used for dimming control, then control precision is improved, but manufacturing costs increase
Solution Approach 1:
The patent combines sensing operations with the existing power supply circuitry during the on-time period. The control circuit integrates sensing functions with power supply and dimming control operations, eliminating the need for separate sensing operations and reducing manufacturing costs while maintaining control precision.
Solution Approach 2:
The control circuit performs sensing operations during the on-time period before dimming control is needed. By conducting sensing operations in advance during the on-time, the system prepares control signals for the next on-time period without requiring separate sensing operations, thereby reducing manufacturing complexity and costs.
Data Source
AI summary
A light-emitting diode (LED) dimmer for an LED lighting device, including a power switch, a drive voltage supply, and a LED light-emitting unit. Operating zones of the LED lighting device are changed in accordance with the switching of the power switch, and a dimming level for a next operating zone is determined on the basis of the dimming level and time while the power switch was on during the previous operating period.