Dimmer Wiring Detection and FET Control for Inductive Loads
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Solution Overview
Problem
Homeowners often incorrectly wire electrical devices like dimmers, leading to dissatisfaction and product returns, and existing technologies struggle to detect and correct incorrect wiring configurations, especially when dealing with inductive loads that cause inductive kickback issues.
Innovation Solution
An electrical wiring device with sensors and a controller that determines the wiring configuration by measuring current or voltage at terminals and adjusts the firing sequence to prevent inductive kickback, including a housing assembly with terminals and series FETs, and sensors to identify the correct terminal connections for line hot and neutral.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If homeowners install electrical devices themselves without proper training, then productivity increases, but reliability decreases due to incorrect wiring configurations
Solution Approach 1:
The dimmer device automatically detects wiring configurations and corrects incorrect connections without requiring user intervention or专业知识. The system performs self-diagnosis and self-correction, allowing untrained homeowners to install devices safely while maintaining high wiring accuracy through automated detection and correction mechanisms
Solution Approach 2:
The device incorporates sensors that continuously monitor terminal connections and provide feedback to the control circuit. When incorrect wiring is detected, the system generates corrective signals to automatically adjust the wiring configuration, creating a closed-loop control system that ensures reliable operation even when installed by untrained users
2Adaptability or versatility
If reverse phase control is used to dim inductive loads, then adaptability improves, but harmful factors increase due to inductive kickback
Solution Approach 1:
The control circuit detects inductive loads beforehand and automatically switches from reverse phase control to forward phase control before the inductive kickback problem can occur. This preliminary detection and preventive switching eliminates the harmful kickback effect while maintaining the ability to control various load types
Solution Approach 2:
The system dynamically changes the control parameter (firing sequence) based on load characteristics. When an inductive load is detected, the control circuit transitions from reverse phase control to forward phase control, adjusting the timing and sequence of FET activation to match the load requirements and prevent harmful effects
3Reliability
If wiring detection and correction features are added, then reliability improves, but device complexity increases
Solution Approach 1:
The detection and correction functions are merged with the existing dimmer control circuitry. The same control circuit that manages FET activation also performs wiring detection and correction, eliminating the need for separate dedicated circuits and minimizing overall device complexity while maintaining high reliability
Solution Approach 2:
The control circuit is designed to perform multiple functions: normal dimming control, wiring configuration detection, and automatic correction. This multi-functional approach eliminates the need for separate specialized circuits, reducing overall device complexity while ensuring reliable operation through integrated intelligence
4Measurement precision
If sensors are added to detect wiring configuration, then measurement precision improves, but device complexity increases
Solution Approach 1:
The patent uses the existing electrical connections and current flow paths as intermediaries for detection purposes. By monitoring voltage drops and current characteristics through the FETs and terminals, the system derives wiring configuration information without requiring separate physical sensors, thus maintaining measurement precision while minimizing added complexity
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 effectively detects and corrects incorrect wiring configurations, preventing inductive kickback and ensuring proper operation of electrical devices, enhancing user safety and device reliability.
Implementation Method 1
sensors to measure current or voltage at terminals
Implementation Method 2
adjusts the firing sequence to prevent inductive kickback
Data Source
AI summary
An electrical wiring device including a housing assembly including a plurality of terminals at least partially disposed therein, the plurality of terminals including a HOT/LOAD terminal, a NEUTRAL terminal, a first traveler terminal, and a second traveler terminal, wherein, when in use, at least one of the terminals is connected to line hot; a first series FET and a second series FET disposed in series between the HOT/LOAD terminal and one of the first traveler terminal or the second traveler terminal; at least one of a first sensor producing a first sensor output according to current flow or a voltage at the one of the first traveler terminal or the second traveler terminal and a second sensor producing a second sensor output according to current flow through the NEUTRAL terminal or according to a voltage between the first series FET and second series FET; and a controller configured to determine to which of the plurality of terminals line hot is connected based, at least, on the first sensor output or the second sensor output and to provide, during operation, at least one of a first control signal to the first series FET and a second control signal to the second series FET according to a user adjustable load setting.