TRIAC Dimmer Detection Circuit Using Dynamic Voltage Comparison

Solution Overview

Problem

Current methods for detecting a TRIAC dimmer connected to an AC grid are unreliable due to fluctuations in AC grid voltage, as they rely on a fixed reference voltage that does not adjust with voltage changes, leading to potential false detection results.

Innovation Solution

A detection circuit comprising a line voltage sampling module, a peak voltage sampling module, an average voltage sampling module, a judgment module, and a bleeder module, where the peak voltage sampling module multiplies the peak voltage by a preset value to generate a comparison voltage, and the judgment module compares this with the average voltage comparison voltage to control the bleeder module, providing a discharge current to the TRIAC dimmer based on the comparison result.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Device complexity

If a fixed reference voltage is used for comparison, then the detection circuit is simple, but the detection reliability deteriorates when AC grid voltage fluctuates

Engineering Contradiction:

Improvedetection circuit complexityVSAvoiddetection reliability

Core Design Contradiction:

Device complexityVSReliability

Solution Approach 1:

The patent applies the dynamics principle by replacing the fixed reference voltage with a dynamic reference voltage that automatically tracks and adapts to AC grid voltage fluctuations. The dynamic reference voltage is generated through a reference voltage generation circuit that responds to changes in the AC grid voltage, ensuring the comparison remains accurate under varying voltage conditions without requiring complex manual adjustments or calibration procedures.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent implements feedback by using the detected AC grid voltage information to dynamically adjust the reference voltage. The system continuously monitors the AC grid voltage and uses this information to regulate the reference voltage generation, creating a closed-loop control mechanism that maintains detection accuracy despite voltage fluctuations in the power supply network.

Inventive Principle:

Principle #23Feedback

2Device complexity

If a fixed reference voltage is used for comparison, then the circuit structure is simple, but false detection risk increases

Engineering Contradiction:

Improvecircuit structureVSAvoiddetection accuracy

Core Design Contradiction:

Device complexityVSMeasurement precision

Solution Approach 1:

The patent applies the dynamics principle by replacing the fixed reference voltage with a dynamic reference voltage that automatically tracks and adapts to AC grid voltage fluctuations. The dynamic reference voltage is generated through a reference voltage generation circuit that responds to changes in the AC grid voltage, ensuring the comparison remains accurate under varying voltage conditions without requiring complex manual adjustments or calibration procedures.

Inventive Principle:

Principle #15Dynamics

3Device complexity

If the reference voltage does not change with AC grid voltage, then the circuit is simple, but detection results become unreliable

Engineering Contradiction:

Improvecircuit simplicityVSAvoiddetection result reliability

Core Design Contradiction:

Device complexityVSReliability

Solution Approach 1:

The patent applies the dynamics principle by replacing the fixed reference voltage with a dynamic reference voltage that automatically tracks and adapts to AC grid voltage fluctuations. The dynamic reference voltage is generated through a reference voltage generation circuit that responds to changes in the AC grid voltage, ensuring the comparison remains accurate under varying voltage conditions without requiring complex manual adjustments or calibration procedures.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent implements feedback by using the detected AC grid voltage information to dynamically adjust the reference voltage. The system continuously monitors the AC grid voltage and uses this information to regulate the reference voltage generation, creating a closed-loop control mechanism that maintains detection accuracy despite voltage fluctuations in the power supply network.

Inventive Principle:

Principle #23Feedback

Data Source

PatentUS11297706B2Detection circuit and device of TRIAC dimmer and detection method

Publication Date: 2022.04.05 SHENZHEN SHENDIE SEMICON

AI summary

Disclosed are detection circuit and device of TRIAC dimmer and detection method. Detection circuit comprises line voltage sampling module, peak voltage sampling module, average voltage sampling module, judgment module, bleeder module, line voltage sampling module samples line voltage, outputs sampling voltage to peak voltage sampling module and average voltage sampling module; peak voltage sampling module outputs first comparison voltage to judgment module according to sampling voltage, average voltage sampling module outputs second comparison voltage to judgment module according to sampling voltage; judgment module compares first comparison voltage with second comparison voltage and outputs control signal according to comparison result to control connection or disconnection of bleeder module; bleeder module provides discharge current for TRIAC dimmer when being connected. According to invention, problem that detection result of TRIAC dimmer is unreliable can be effectively solved, and detection accuracy is improved.