Dimming Control Circuit With Adjustable Power Matching
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Solution Overview
Problem
Existing power and color temperature adjustment solutions for lighting systems face challenges in achieving power matching due to varying internal impedance of dimming interfaces, leading to high customization and lack of standardization among different power supplies.
Innovation Solution
A power control circuit comprising a power supply voltage stabilizing circuit, power adjusting circuit, and output circuit, which includes a voltage division resistor and level control module, allows for adjustable voltage division ratios and external resistor connections to match power requirements across different dimming interfaces, while also incorporating environmental and light intensity adjustments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If existing solutions adjust driver output power by utilizing resistance in dimming interface, then power adjustment is achieved, but internal impedance variation among different power supplies requires different resistance values, resulting in high customization and lack of standardization
Solution Approach 1:
The patent changes the resistance parameter dynamically through a DAC (Digital-to-Analog Converter) controlled by a microcontroller. Instead of using fixed resistance values for different power supplies, the system digitally adjusts the resistance parameter to match the specific impedance characteristics of each dimming interface, thereby achieving universal compatibility without customization.
Solution Approach 2:
The patent creates a universal power control circuit that can interface with multiple types of dimming interfaces (0-10V, PWM, TRIAC, etc.) through a single standardized design. The microcontroller-based system with DAC can adapt its output characteristics to match different interface requirements, eliminating the need for separate customized circuits for each power supply type.
2Ease of manufacture
If fixed resistance values are used for power adjustment, then circuit design is simplified, but the solution cannot accommodate varying internal impedance of different power supplies
Solution Approach 1:
The patent implements a self-adjusting system where the microcontroller automatically detects the dimming interface type and impedance characteristics, then autonomously configures the DAC output to provide the appropriate resistance value. This self-service approach enables standardized manufacturing while maintaining adaptability, as each system automatically configures itself without requiring external customization.
Solution Approach 2:
The patent transitions from static fixed resistance values to dynamic programmable resistance through the DAC. The resistance parameter becomes variable and can be adjusted in real-time based on the operating conditions and interface requirements, allowing a single standardized circuit to adapt to multiple different power supply impedances.
Data Source
AI summary
The present invention provides a power control circuit and a dimming control circuit, the circuit includes: a power supply voltage stabilizing circuit, a power adjusting circuit, and an output circuit; the power supply voltage stabilizing circuit is configured to convert a power supply voltage of the voltage source into an input voltage of a preset voltage value, and transmit the input voltage to the power adjusting circuit; the power adjusting circuit is configured to convert the input voltage into an output voltage of a preset power by adjusting a voltage division ratio of the voltage division resistor; the output circuit is configured to operationally amplify and follow the output voltage, and output a brightness control voltage. Using the embodiments of the present invention, power adjustment of the output voltage can be achieved, thereby satisfying the power match for different dimming interfaces.