LED Driver Circuit with Dimmer Phase Detection for Compatibility
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Solution Overview
Problem
Existing LED lighting systems lack the ability to implement dimming and color control features when replacing conventional lamps, as they do not include necessary dimmers and existing dimmers are not compatible with LED lamps, leading to increased installation costs and complexity.
Innovation Solution
A power circuit for LED lighting devices that includes an AC power supply, a dimmer, and a control circuit with filtering, rectifying, and flyback conversion units, along with a dimmer phase detection unit and color control mechanisms, allowing for dimming and color control operations using existing dimmers without altering the LED lighting device layout.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If LED lamps are designed with lamp-head structures similar to conventional lamps for easy installation, then ease of installation is improved, but the ability to implement dimming and color control features deteriorates
Solution Approach 1:
The patent introduces a dimmer-compatible control circuit as an intermediary component that sits between the existing dimmer and the LED driver. This control circuit includes a microcontroller that can interpret dimmer signals and convert them into appropriate control signals for the LED driver, enabling dimming and color control functionality without requiring changes to the physical lamp structure or replacement of existing dimmers.
Solution Approach 2:
The control circuit is designed with multi-functionality to handle both dimming operations and color control operations. The microcontroller can process various types of dimmer signals (leading edge, trailing edge, universal) and generate corresponding control signals for RGB LED channels, making the system universally compatible with existing dimmers while providing enhanced functionality.
2Device complexity
If existing dimmers are used with LED lamps without modification, then device complexity is reduced, but the functionality for dimming and color control deteriorates
Solution Approach 1:
The patent merges the control circuit functionality directly into the LED driver unit, combining the dimmer interface, microcontroller, and LED driver functions into a single integrated device. This eliminates the need for separate external control modules and simplifies the overall system architecture while maintaining full dimming and color control capabilities.
3Adaptability or versatility
If a dimmer is added to conventional lighting systems to enable dimming feature, then dimming capability is improved, but cost and installation complexity increase
Solution Approach 1:
The control circuit is designed to automatically detect and adapt to the type of dimmer connected to it. The microcontroller includes built-in detection algorithms that can identify leading edge, trailing edge, or universal dimmer types and automatically configure the appropriate control strategy, eliminating the need for manual setup or complex installation procedures.
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
Enables convenient installation of LED lighting devices that can replace traditional lamps, providing adjustable brightness and color control through existing dimmers, reducing installation costs and complexity while maintaining compatibility with conventional lighting systems.
Implementation Method 1
a filtering unit configured to filter a voltage signal coming from the dimmer and output the filtered voltage signal
Implementation Method 2
a rectifying unit configured to receive the signal outputted from the filtering unit, rectify the signal to a DC signal and output the DC signal
Implementation Method 3
a transformer unit connected to the rectifying unit, where the transformer unit includes a primary coil and a secondary coil
Implementation Method 4
a dimmer phase detection unit configured to sample the rectified voltage signal at point K, convert the voltage signal to a low voltage pulse signal, and output the converted low voltage pulse signal
Implementation Method 5
a flyback conversion unit configured to receive the pulse signal outputted by the dimmer phase detection unit and adjust a current flowed through the transformer unit and a first transistor to control the output current of the LED lighting device based on the pulse signal
Data Source
AI summary
A power circuit for an LED lighting device including an AC power supply, a dimmer and a control circuit is provided. The control circuit includes a filtering unit configured to filter a voltage signal coming from the dimmer and a rectifying unit configured to receive the signal outputted from the filtering unit and rectify the signal to a DC signal. The control circuit also includes a transformer unit connected to the rectifying unit. Further, the control circuit includes a dimmer phase detection unit configured to sample the rectified voltage signal at point K and convert the voltage signal to a low voltage pulse signal and a flyback conversion unit configured to receive the pulse signal outputted by the dimmer phase detection unit and adjust a current flowed through the transformer unit and a first transistor to control the output current to the LED lighting device.