LED Lighting Control Circuit for Multi-Mode Digital Dimming
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Solution Overview
Problem
Existing LED lighting products face limitations in dimming modes, compatibility with various switching power supplies, and require multiple external resistors and pins, leading to increased costs and reduced application scope.
Innovation Solution
A lighting control circuit with a protocol conversion circuit, dimming selection circuit, feedback circuit, and driving signal generation circuit that converts input data into multi-channel digital signals, allowing flexible dimming modes and protection thresholds without external resistors, and supports both analog and chopper dimming.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple external resistors and pins are used for configuring switching power supply functions, then the functionality and adaptability are improved, but the device complexity and cost increase
Solution Approach 1:
The patent integrates multiple configuration functions into a single digital control interface. Instead of using separate external resistors for different functions (dimming mode selection, protection thresholds, etc.), the invention combines all these configuration capabilities into a unified digital communication protocol that can be programmed through software, thereby reducing peripheral components while maintaining full functionality.
Solution Approach 2:
The digital control interface serves multiple purposes: it controls dimming modes, sets protection thresholds, configures operating parameters, and communicates system status. This single universal interface replaces multiple dedicated hardware components, reducing overall device complexity while enhancing adaptability across different application scenarios.
2Adaptability or versatility
If multiple external resistors and pins are used for configuring switching power supply functions, then the functionality and adaptability are improved, but the cost increases
Solution Approach 1:
By merging multiple configuration functions into a single digital interface, the patent reduces the bill of materials (BOM) cost associated with external resistors and additional pins. The integration eliminates the need for multiple discrete components, directly lowering manufacturing costs while preserving full configurability.
Solution Approach 2:
The patent uses digital software configuration to replace physical hardware components. Instead of physically differentiating circuitry with resistors for each function, the invention creates a virtual copy of configuration capabilities through programmable digital parameters, thereby reducing hardware cost while maintaining functional equivalence.
3Ease of operation
If PWM dimming mode is used with fixed driving voltage, then the control simplicity is improved, but the compatibility with various switching power supplies deteriorates
Solution Approach 1:
The patent implements dynamic dimming control that can adapt to different switching power supply characteristics. Instead of using a fixed PWM approach, the system dynamically adjusts driving parameters based on the specific power supply being controlled, enabling compatibility across various topologies (buck, boost, flyback) while maintaining ease of operation through unified digital control.
Solution Approach 2:
The invention changes the control parameters dynamically based on the power supply type and operating conditions. By programmably adjusting driving voltage, current limits, and timing parameters through the digital interface, the system maintains simple control operation while achieving broad compatibility with different switching power supply configurations.
Data Source
AI summary
The present application discloses a lighting control circuit, a lighting control method, and a lighting circuit. The lighting control circuit includes at least a protocol conversion circuit, and a driving signal generation circuit. The dimming selection circuit stores an input data signal as multi-channel digital signals. The driving signal generation circuit controls an off time of a main power transistor according to a first dimming signal derived from the multi-channel digital signals in a first dimming mode, and controls an off time of the main power transistor according to a reference signal derived from the multi-channel digital signals and an output feedback signal in a second dimming mode. The lighting control circuit according to the present disclosure stores the input data signal as multi-channel digital signals, and the circuit can be configured with different dimming modes according to the protocol alone to improve the circuit flexibility.