Passive Non-linear Analog Signal Conversion Circuit for LED Dimming
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Solution Overview
Problem
Conventional LED lighting systems require high-cost microprocessors to control non-linear load characteristics, which are prone to malfunctions due to noise and disturbance, necessitating a more efficient and cost-effective analog signal conversion method.
Innovation Solution
A non-linear analog signal conversion circuit configured with passive elements, including an input module, inversion module, non-linear conversion module, and filter module, that converts input power into reference power using PWM dimming signals, reducing the need for microprocessors and enhancing power efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a microprocessor is used to control non-linear LED load characteristics, then control precision is improved, but device complexity and cost increase
Solution Approach 1:
The patent replaces the microprocessor-based digital control system with an analog signal processing circuit that uses passive elements (resistors, capacitors, inductors) to directly process and convert the dimming signal. This substitution eliminates the need for complex digital processing while maintaining control precision through analog signal manipulation, thereby reducing device complexity and cost.
Solution Approach 2:
The invention uses simple, inexpensive passive components (resistors, capacitors, inductors) instead of expensive microprocessors. These passive elements are low-cost components that can be easily replaced if needed, providing a cost-effective solution for controlling non-linear LED load characteristics without requiring high-performance integrated circuits.
2Measurement precision
If a microprocessor is used for signal processing, then control accuracy is improved, but reliability decreases due to noise and disturbance
Solution Approach 1:
The patent replaces the microprocessor-based digital system with an analog signal processing circuit using passive elements. This substitution inherently improves reliability because analog circuits are less susceptible to noise and disturbance that cause digital signal errors. The passive elements naturally filter and process signals without requiring complex error correction software, making the system more robust against environmental interference.
3Device complexity
If passive elements are used instead of microprocessors, then device complexity is reduced, but manufacturing precision requirements increase
Solution Approach 1:
The patent employs standard, commercially available passive elements (resistors, capacitors, inductors) with well-defined manufacturing tolerances. By using these standardized components rather than custom-designed microprocessor circuits, the invention actually reduces manufacturing precision requirements. The passive elements are mass-produced with consistent characteristics, making them easier to manufacture and assemble compared to complex integrated circuits.
4Adaptability or versatility
If microprocessors are used for dimming control, then adaptability is improved, but loss of energy increases due to standby power consumption
Solution Approach 1:
The patent uses passive elements that passively process and convert the dimming signal without requiring active power consumption for signal processing. The circuit automatically adapts to different dimming levels through the inherent characteristics of the passive components, eliminating the need for a powered microprocessor in standby mode. This self-service approach significantly reduces or eliminates standby power consumption while maintaining adaptability.
Data Source
AI summary
A non-linear analog signal conversion circuit configured of passive elements and a lighting apparatus using the same. The non-linear analog signal conversion circuit includes: an input module for inputting a dimming signal; an inversion module for inverting the dimming signal; a non-linear conversion module for non-linearly converting input power Vdc into first output power Vo1 according to the inverted dimming signal; and a filter module for converting the first output power Vo1 of an output terminal of the non-linear conversion module into reference power Vref by removing noise of the first output power Vo1.