Phase-Cut Dimming Control System With Feedback Modulation
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Solution Overview
Problem
Existing phase-cut dimming systems lack effective control mechanisms to manage power transmission and current flow efficiently in AC power transmission circuits, leading to suboptimal dimming performance and energy management.
Innovation Solution
A phase-cut dimming control system comprising a phase angle detector, feedback signal generator, feedback signal modulator, power transmission controller, and power transmission circuit, which detects phase angles, generates and modulates feedback signals to control power transmission and current flow, utilizing hysteresis filters and low-pass filters to optimize power delivery to loads like LEDs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If phase-cut dimming is applied to control power supplied to a load, then power transmission can be controlled, but the control mechanism becomes complex and inefficient
Solution Approach 1:
The patent implements a feedback signal generator that detects the phase angle of the input voltage and generates feedback signals based on the relationship between the detected phase angle and a reference signal. This feedback mechanism enables precise control of power transmission to the load by continuously monitoring and adjusting the dimming angle, resolving the contradiction between achieving effective power control and maintaining system simplicity.
Solution Approach 2:
The system generates a reference signal in advance that corresponds to the detected phase angle. This preliminary action allows the feedback signal generator to efficiently determine the appropriate dimming control without complex real-time calculations, simplifying the control mechanism while maintaining precise power transmission control.
2Measurement precision
If feedback signal modulation is implemented to improve control precision, then dimming performance improves, but system complexity increases
Solution Approach 1:
The feedback signal modulator receives the initial feedback signal and modulates it to generate a modulated feedback signal. This feedback-based modulation approach improves dimming control precision by ensuring accurate synchronization between the control signal and the phase-cut waveform, while the feedback nature of the modulation simplifies the processing logic compared to open-loop approaches.
Solution Approach 2:
The modulated feedback signal acts as an intermediary between the phase angle detection and the power transmission control. This intermediate signal processing step improves precision by decoupling the detection and control functions, allowing each to be optimized independently without significantly increasing overall system complexity.
3Stability of the object's composition
If hysteresis filtering is applied to stabilize feedback signals, then control stability improves, but response time increases
Solution Approach 1:
The hysteresis filter applies different threshold levels for increasing and decreasing feedback signals, creating a stability margin that prevents oscillation. By carefully selecting the hysteresis level parameter, the system achieves stable feedback signal control while minimizing the time delay introduced by the filtering action, thus balancing stability and response time.
Data Source
AI summary
A phase-cut dimming control system according to the embodiment includes a phase angle detector configured to detect a phase angle of an input voltage generated by phase-cut dimming, a feedback signal generator configured to generate a first reference signal corresponding to the detected phase angle, and generate an initial feedback signal based on a detection signal corresponding to power supplied to a load and the first reference signal, a feedback signal modulator configured to modulate the initial feedback signal and generate a feedback signal, a power transmission controller configured to generate a control signal which controls power transmission according to the feedback signal, and a power transmission circuit configured to transmit power to the load according to the control signal.