Microcontroller Dimmer Circuit for Ripple Signal Sensitivity
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing dimmer circuits for phase control methods are not effectively adaptable to microcontroller activation, especially in high ripple control signal environments, leading to insensitivity issues with microcontroller-controlled dimmers.
Innovation Solution
A dimmer circuit design that incorporates a microcontroller for synchronized zero crossing detection and phase angle derivation using an R/C combination, with the microcontroller controlling the power unit to ensure synchronized operation with the mains AC voltage and improved sensitivity to ripple control signals, utilizing either a potentiometer or a comparator for phase angle adjustment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a microcontroller is used to control the power unit in a dimmer circuit, then the control precision and adaptability are improved, but the sensitivity to ripple control signals deteriorates
Solution Approach 1:
The patent introduces a specialized circuit as an intermediary between the microcontroller and the power unit. This circuit includes a capacitor that is synchronized with the mains voltage and discharged at specific timing, creating a reference signal that mediates between the digital microcontroller and the analog power control, thereby filtering out ripple control signal interference while maintaining precise control capability
Solution Approach 2:
The patent replaces traditional analog phase control mechanisms with a microcontroller-based digital control system. The microcontroller uses software filters and synchronized capacitor discharge timing to achieve phase control, substituting mechanical/analog components with electronic/digital solutions that are inherently more resistant to ripple control signal interference
2Device complexity
If traditional R/C combination is used for phase angle control, then the circuit simplicity is maintained, but the adaptability to microcontroller activation and ripple signal environments deteriorates
Solution Approach 1:
The patent merges the traditional R/C phase control circuit with a synchronization mechanism tied to mains voltage zero-crossing detection. The capacitor in the R/C combination is specifically discharged at synchronized intervals based on mains voltage cycles, combining the simplicity of analog phase control with the timing precision of digital synchronization, thereby achieving both circuit simplicity and microcontroller adaptability
Solution Approach 2:
The patent implements periodic discharge of the capacitor in the R/C combination synchronized with the mains voltage frequency. This periodic action creates a rhythmic reference signal that aligns with the AC cycle, enabling the simple R/C circuit to work effectively with microcontroller-based control by providing periodic timing references at the standard power frequency
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 proposed dimmer circuit enhances sensitivity to ripple control signals and allows for precise control of brightness, offering improved performance over traditional dimmer circuits by synchronizing the power unit with the mains AC voltage and using software filters to reduce ripple interference.
Implementation Method 1
a capacitor C specifically switched by the microcontroller at the end of each half-wave of the Mains voltage is discharged
Data Source
Figure 1~2
Figure 3
AI summary
The circuitry (10B) has a microcontroller (U1) controlling power semiconductors (Q1, Q2) that are arranged in series with a load (6) i.e. illumination device, at an alternating voltage system (7). A zero crossover recognition unit (1) synchronizes the microcontroller with zero crossover of sinusoidal net alternating voltage. A phase angle (Phi) is derived by a resistor and/or capacitor combination with a resistor (R3) and a capacitor (C1) that lies in series to the resistor. The capacitor is discharged by the microcontroller to an end of half wave of main voltage.