Universal Phase Control Dimmer with Load-Type Detection
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Solution Overview
Problem
Existing phase dimming solutions for lighting devices are complex, costly, and prone to false load-type detection, leading to unreliable dimming operations, especially in wireless lighting control systems, due to the need for additional circuits and slow detection times.
Innovation Solution
A universal dimming device with a load-type detection circuit that uses a resistive voltage divider, amplifier circuit, and control circuit to automatically detect inductive or non-inductive loads and adjust the phase-cut dimming mode, requiring minimal additional components and improving reliability by analyzing multiple AC cycle characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If additional detection circuits are added to improve load-type detection accuracy, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent extracts the load-type detection function from a separate dedicated circuit and integrates it into the existing zero-crossing detection circuit. The same voltage divider and comparator components used for zero-crossing detection are repurposed to detect inductive kickback signals, eliminating the need for additional detection circuits while maintaining detection accuracy.
Solution Approach 2:
The patent makes the existing zero-crossing detection circuit multi-functional by enabling it to perform both zero-crossing detection and load-type detection. The comparator output is used to generate both the zero-crossing interrupt signal and the inductive load detection signal, allowing one circuit to serve multiple purposes and reducing overall system complexity.
2Reliability
If complex detection circuits are used to improve load-type detection reliability, then reliability is improved, but manufacturing cost increases
Solution Approach 1:
The patent enables the existing control circuit to perform load-type detection using its own existing components without requiring external detection circuits. The microcontroller uses the same comparator and voltage divider already present for zero-crossing detection, making the system self-sufficient and eliminating additional manufacturing costs while improving reliability through accurate load-type identification.
3Speed
If traditional load-type detection methods are used, then detection speed is improved, but measurement precision deteriorates due to false positives
Solution Approach 1:
The patent implements feedback by monitoring the comparator output signal characteristics and using this information to distinguish between genuine inductive kickback signals and false positives from capacitive loads. The microcontroller analyzes the timing and amplitude of the detected signals to accurately determine load type, improving measurement precision while maintaining fast detection speed through real-time signal analysis.
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
The solution provides reliable and cost-effective automatic load-type detection and phase-cut mode selection, minimizing false positives and ensuring stable dimming operations in wireless lighting control systems.
Implementation Method 1
a resistive voltage divider coupled across the input and output nodes of the power switching circuit, the resistive voltage divider having a sensing node providing an artifact signal formed by the difference between the AC power signal and the phase-cut power signal
Implementation Method 2
an amplifier circuit receiving the artifact signal and configured to provide an analog output signal at an amplifier output node based on an amplified difference between the artifact signal and the AC power signal
Data Source
AI summary
Embodiments of the present disclosure provide multi-mode phase control dimmers for lighting devices, particularly for use with wireless lighting control systems. The disclosed universal dimming devices include a load-type detection circuit for determining whether the load for connected lighting devices has an inductive characteristic. The system automatically detects the load characteristic and self-adjusts its phase-cut dimming mode in response. The disclosed solutions require minimal additional components to provide load-type detection beyond those components already included in typical phase dimming applications, particularly in a wireless lighting control environment, thereby minimizing cost. The disclosed solutions have improved reliability by detecting multiple characteristics detected for each of a plurality of AC cycles in order to reliably distinguish between load types.