Color Mixing Circuit with Adjustable Resistance and Gating
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Solution Overview
Problem
Existing color mixing methods for light sources result in low light source utilization, low light efficiency, and high costs due to half of the lamp beads being unlit, creating dark areas and requiring multiple models for different color temperatures.
Innovation Solution
A color mixing circuit with a power supply module, light source modules, resistance modules, and a circuit gating module, allowing for adjustable resistance values and controlled on-off states to optimize light emission, ensuring all lamp beads remain lit and enabling efficient color temperature adjustment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a three-position dip switch is used to control 3000K and 4000K lamp beads, then color temperature adjustment is achieved, but half of the lamp beads are wasted resulting in low light source utilization
Solution Approach 1:
The patent applies dynamics by replacing the static three-position dip switch with a dynamic control system using a microcontroller and PWM modulation. This allows continuous adjustment of the mixing ratio between 3000K and 4000K lamp beads, enabling flexible color temperature control while keeping all lamp beads operational. The system can dynamically adjust which lamp beads are active and at what intensity, eliminating the waste of having half the lamp beads permanently unlit.
Solution Approach 2:
The patent changes the control parameter from discrete switch positions to continuous PWM duty cycle values. By varying the duty cycle parameter, the system can precisely control the effective contribution of each lamp bead type, achieving any desired color temperature within the mixing range. This parameter change enables full utilization of all lamp beads while maintaining versatile color temperature adjustment capability.
2Ease of operation
If lamp beads are turned off to achieve color mixing, then color temperature control is simplified, but dark areas appear and light efficiency decreases
Solution Approach 1:
The patent replaces the mechanical switch-based control system with an electronic PWM control system. Instead of mechanically turning lamp beads on or off, the system uses electronic pulse width modulation to control the effective contribution of each lamp bead. This substitution eliminates the need to darken any lamp beads for color mixing, as PWM allows continuous dimming and mixing while maintaining all lamp beads in a lit state, thereby preventing dark areas and maximizing light efficiency.
Solution Approach 2:
The patent employs periodic PWM action to control the lamp beads. By rapidly switching the drive signal between high and low states at a high frequency, the system creates the illusion of continuous dimming and color mixing. This periodic action allows all lamp beads to remain physically lit while achieving color temperature control through temporal modulation, eliminating dark areas and maintaining high light efficiency.
3Adaptability or versatility
If multiple lamp beads of different color temperatures are used, then color mixing capability is enhanced, but device complexity and cost increase
Solution Approach 1:
The patent applies universality by designing a single microcontroller-based control system that can manage multiple lamp bead types with different color temperatures. The same PWM control architecture and microcontroller can handle 3000K, 4000K, and other color temperature lamp beads, making the control system multi-functional. This universal approach enhances color mixing capability while avoiding the need for separate control circuits for each lamp bead type, thereby managing device complexity.
Solution Approach 2:
The patent uses copying by implementing a standardized control template that can be replicated for different lamp bead types. The microcontroller uses the same PWM generation and control logic for all color temperature lamp beads, merely varying the duty cycle parameters. This copying approach allows the system to handle multiple color temperatures with a single control architecture, enhancing versatility without proportionally increasing device complexity.
Data Source
AI summary
A color mixing circuit for light sources comprising a power supply module, a first light source module, a second light source module, a first resistance module, a second resistance module, and a circuit gating module; the first light source module is respectively connected to the power supply module and the circuit gating module; the first light source module is further connected to the circuit gating module through the first resistance module; the second light source module is respectively connected with the power supply module and the circuit gating module; the second light source module is further connected to the circuit gating module through the second resistance module; the circuit gating module is also connected to the power supply module; the first light source module and the second light source module are configured to emit light.