AC LED Control Circuit for Switchable Color Temperature Lighting

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Solution Overview

Problem

The overproduction and difficulty in on-site installation of LED lights with different color temperatures due to the variety of available options, leading to inventory management challenges for manufacturers and limited user experience in different scenarios.

Innovation Solution

A control circuit that utilizes two LED light sets with different color temperatures, driven by two AC input voltages, and switches controlled by a control circuit to generate three different color temperatures using half-wave rectifier circuits and optical couplers.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If manufacturers produce multiple kinds of LED lights with different color temperatures to meet different scenario requirements, then user needs for different scenarios are satisfied, but manufacturers face overproduction and excessive storage problems

Engineering Contradiction:

Improvecolor temperature varietyVSAvoidinventory quantity

Core Design Contradiction:

Adaptability or versatilityVSQuantity of substance

Solution Approach 1:

The patent applies universality by designing a single LED light product that can perform multiple functions - specifically, it can emit different color temperatures (warm white, cool white, and mixed) by controlling different LED light sets. This allows one product to replace what would traditionally require multiple separate products, thereby satisfying diverse user needs while reducing manufacturer inventory requirements

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Adaptability or versatility

Engineering Contradiction:

Improvecolor temperature varietyVSAvoidinstallation difficulty

Core Design Contradiction:

Adaptability or versatilityVSEase of operation

Solution Approach 1:

By making the LED light itself universal (capable of multiple color temperatures), the need for installers to handle and install multiple different types of lights is eliminated. The single unified design simplifies the installation process while still providing the ability to meet different scenario requirements through controlled color temperature switching

Inventive Principle:

Principle #6Universality (Multi-functionality)

3Ease of manufacture

If a control circuit uses two LED light sets with different color temperatures to generate three different color temperatures, then inventory is reduced and manufacturing is simplified, but the control circuit complexity increases

Engineering Contradiction:

Improvemanufacturing simplicityVSAvoidcontrol circuit complexity

Core Design Contradiction:

Ease of manufactureVSDevice complexity

Solution Approach 1:

The patent employs dynamics by using controllable switches (Q1, Q2) that can dynamically connect or disconnect different LED light sets based on control signals. This dynamic switching mechanism allows the system to adjust color temperature output flexibly while maintaining a relatively simple overall circuit structure, balancing control complexity with manufacturing simplicity

Inventive Principle:

Principle #15Dynamics

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

Enables manufacturers to reduce inventory and enhance user experience by generating multiple color temperatures with a single control circuit, facilitating flexible color temperature adjustments in various scenarios.

Implementation Method 1

the positive pole of the LED light sets A and B are connected with the output of a step-down and constant current source circuit

Methodology Applied

Scientific EffectElectrical step-down and constant current regulation:

Implementation Method 2

two half-wave rectifier circuits; wherein the first half-wave rectifier circuit and an optical coupler OT1 are arranged between the AC input voltage L1 and the switch Q1

Methodology Applied

Scientific EffectHalf-wave rectification:

Implementation Method 3

two optical couplers OT1 and OT2; wherein the first half-wave rectifier circuit and an optical coupler OT1 are arranged between the AC input voltage L1 and the switch Q1

Methodology Applied

Scientific EffectOptical coupling:

Data Source

PatentUS12588118B2Control circuit for driving different color temperature LED lights with AC input voltage

Publication Date: 2026.03.24 GU YUAN OPTOELECTRONIC TECHNOLOGY (SHANGHAI) CO LTD

AI summary

A control circuit for driving different color temperatures LED lights with AC input voltage comprises a LED light set A with one color temperature; and a LED light set B with another color temperature; two AC input voltages L1 and L2; wherein the LED light sets A and B are arranged in parallel. Two different color temperatures LED light sets are used to generate three different color temperatures LED lights sources, which meets the requirement for using different LED color temperature light sources in different scenarios to reduce the inventory of different LED lights.