Universal Dimmer Circuit Voltage Detection
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Solution Overview
Problem
Existing dimmers face challenges in automatically detecting and adapting to varying voltage levels and voltage-dependent conditions, leading to potential damage or improper operation when used with different AC power supplies, particularly in regions with different voltage standards.
Innovation Solution
A universal dimmer circuit that includes a zero-cross detection circuit and a controller, which calculates the pulse width delta from the zero-cross signal to determine the zero-cross delay and voltage level, allowing for adjustments in dimming settings, such as timing and overcurrent trip values, to accommodate different voltage levels without the need for excessive components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a universal dimmer uses various detection circuit components to automatically detect the incoming voltage, then the dimmer can operate at different voltage levels, but the circuit size and cost increase due to the addition of numerous additional and large components
Solution Approach 1:
The zero-cross detection circuit serves dual purposes: it synchronizes the dimmer with the AC line and simultaneously provides voltage level detection information. The controller analyzes the zero-cross signal characteristics (such as pulse width or timing) to determine the applied voltage level, eliminating the need for separate voltage detection components.
Solution Approach 2:
The existing zero-cross detection circuit, originally designed for timing synchronization, is repurposed to also perform voltage level detection. By analyzing the same signal for multiple parameters (timing and voltage level), the circuit achieves multi-functionality without adding components.
2Device complexity
If a dimmer is designed to support a single voltage level, then the circuit design is simplified, but the dimmer cannot operate with other voltage levels and may be damaged
Solution Approach 1:
The dimmer transitions from a static, fixed-voltage design to a dynamic, adaptive design. The controller continuously monitors the zero-cross signal characteristics and adjusts the dimmer's operation parameters based on the detected voltage level, enabling the same circuit to safely and effectively operate across multiple voltage levels.
Data Source
AI summary
A circuit adapted to detect applied voltage and/or voltage based conditions. The circuit comprises a zero-cross detection circuit and a controller. The zero-cross detection circuit is adapted to output a zero-cross signal comprising zero-cross events based on an applied alternating current power signal. The controller is adapted to store a relationship between a pulse width delta, frequency, and voltage. The controller is adapted to sense the zero-cross signal from the zero-cross detection circuit to determine its frequency and pulse width delta by calculating a difference between a high-time and a low-time of the zero-cross signal, and determine the applied voltage based on the stored relationship. The controller can adjust at least one setting of the circuit based on the determined applied voltage, such as the timing of a dimming circuit. In another embodiment, the controller may directly detect voltage based conditions, such as zero-cross delays a dimmer circuit. The controller is adapted store a relationship between a pulse width delta and zero-cross signal delay. The controller is adapted to receive the zero-cross signal from the zero-cross detection circuit, determine a pulse width delta, and determine a zero-cross delay based on the determined pulse width delta and the stored relationship.