LED Driver Circuit Using Segmented Control Signals
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Solution Overview
Problem
Existing solutions for controlling the brightness of LED light devices are inadequate, as conventional dimming controllers are not feasible for adjusting the brightness of LED light devices effectively.
Innovation Solution
A driver circuit comprising a switch unit, lighting control unit, control circuit unit, optical coupler, and power control unit is used to generate control signals that adjust the brightness of a set of light-emitting diodes, employing pulse width modulation and multiple control signals to achieve fine brightness adjustment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional dimming controllers are used, then the control structure is simple, but the brightness adjustment capability is insufficient
Solution Approach 1:
The control structure is segmented into multiple independent modules: switch unit with n controllable terminals, lighting control unit, control circuit unit, optical coupler, and power control unit. Each module performs a specific function in the control signal generation chain, enabling fine brightness adjustment through coordinated operation while maintaining modular simplicity
Solution Approach 2:
The patent transitions from conventional single-dimension dimming control to multi-dimensional control by introducing n control terminals that generate multiple control signals (first control signal, second control signal, third control signal) with different duty ratios, expanding the brightness adjustment capability across multiple control dimensions
2Measurement precision
If multiple control signals are generated to achieve fine brightness adjustment, then the brightness control precision is improved, but the device complexity increases
Solution Approach 1:
The patent employs pulse width modulation (PWM) technique where control signals are generated as periodic square waves with varying duty ratios. The switch unit generates first control signals with different duty ratios, the lighting control unit generates second control signals, and the control circuit unit combines them to produce third control signals with precise duty ratio control, enabling fine brightness adjustment through periodic signal modulation
Solution Approach 2:
The optical coupler acts as an intermediary component that receives the third control signal and generates the fourth control signal that directly drives the LED. This intermediary isolates the complex multi-signal control logic from the LED driving circuitry, allowing precise brightness control through the fourth control signal's duty ratio while simplifying the interface to the LED
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
The driver circuit allows for precise control of LED brightness by adjusting the duty ratio of control signals, enabling the LED light device to emit light at various brightness levels, overcoming the limitations of existing technologies.
Implementation Method 1
The optical coupler is configured to generate a fourth control signal according to the third control signal. The optical coupler includes an input terminal coupled to the output terminal of the control circuit, and an output terminal configured to output the fourth signal.
Data Source
AI summary
A driver circuit for controlling brightness of a set of light-emitting diodes. The driver circuit includes a switch unit for providing n first control signals, a lighting control unit for sending a second signal, a control circuit unit coupled to the switch unit and the lighting control unit and used to send a third control signal according to the n first control signal and the second control signal, an optical coupler for generating a fourth control signal according to the third control signal, and a power control unit for enabling the light-emitting diodes according to the fourth control signal. The n first control signals and the second control signal are both adjustable.