Electrical Receptacle TRIAC Control for Arc-Safe Plug Insertion
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Solution Overview
Problem
Conventional electrical receptacles face challenges in usability and safety, including difficulty in opening tamper-resistant gates, potential for arcing and electric shock due to incomplete insertion or removal of plugs, and false tripping of arc fault circuit interrupters (AFCI). Additionally, these receptacles lack individual outlet disconnection capability, accurate current measurement, and surge protection.
Innovation Solution
The electrical receptacle incorporates a processor-controlled system with sensors monitoring hot and neutral power lines. A TRIAC switch is used in series with the hot power line, and sensors provide input to the processor for determining conditions at the receptacle contacts. The processor outputs activation or deactivation signals to the TRIAC switch based on sensor inputs, ensuring safe and controlled power delivery. The receptacle also includes surge protection via a varistor and can self-test for faults and recalibrate sensors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If conventional tamper-resistant gates with spring loaded shutters are used, then safety against foreign objects is improved, but ease of operation deteriorates due to excessive force required and difficulty when located close to floor or behind furniture
Solution Approach 1:
The patent replaces the mechanical spring-loaded shutter system with an optical sensing system. Optical sensors detect the presence of plug blades, and a processor controls power delivery based on detection results, eliminating the need for mechanical force to open gates while maintaining foreign object protection
Solution Approach 2:
The patent introduces optical sensors as intermediaries between the physical plug insertion and the power delivery system. The sensors detect blade presence and transmit this information to a processor, which then controls power delivery, creating an intermediary detection layer that removes the mechanical gate-opening requirement
2Difficulty of detecting and measuring
If conventional arc fault circuit interrupters are used, then arc fault detection is improved, but reliability deteriorates due to false tripping when live load is connected
Solution Approach 1:
The patent performs preliminary verification of proper plug insertion before enabling power delivery. Optical sensors confirm blade presence and correct positioning in advance, preventing conditions that would trigger false AFCI trips while maintaining genuine arc fault detection capability
3Productivity
If conventional electrical receptacles are used, then basic power delivery is provided, but safety deteriorates due to lack of surge protection and individual outlet disconnection capability
Solution Approach 1:
The patent divides the receptacle into independently controllable outlets, each with its own optical sensors and power control. This segmentation allows individual outlet disconnection when faults are detected, preventing whole-circuit shutdowns and enabling targeted protection while maintaining basic power delivery functionality
Solution Approach 2:
The patent incorporates surge protection circuitry and fault detection mechanisms that are activated before damage occurs. The system monitors for abnormal conditions and preemptively protects connected devices, cushioning against surges and faults before they can cause harm
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
This solution enhances the safety and usability of electrical receptacles by preventing arcing and electric shock, reducing false tripping of AFCI devices, and providing individual outlet control. It also ensures accurate current measurement and surge protection, improving overall electrical safety and reliability.
Implementation Method 1
The receptacle also includes surge protection via a varistor
Implementation Method 2
A TRIAC switch is used in series with the hot power line, and sensors provide input to the processor for determining conditions at the receptacle contacts
Data Source
AI summary
An electrical receptacle contains a plug outlet that has a pair of contacts for electrical connection to respective hot and neutral power lines. A controlled switch, such as a TRIAC, is connected in series relationship between the outlet contact and the hot power line. Sensors in the receptacle outputs signals to a processor having an output coupled to the control terminal of the controlled switch. The processor outputs an activation signal or a deactivation signal to the controlled switch in response to received sensor signals that are indicative of conditions relative to the first and second contacts.