Shore Power Transfer Switch with Automated Quality Monitoring
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Solution Overview
Problem
Existing electrical power systems in recreational vehicles face challenges in safely and efficiently switching between generator power and external shore power, particularly in ensuring orderly and fail-safe control due to varying power levels and power quality issues.
Innovation Solution
A power switching system with a transfer switch that includes a controller, relays, and contactors, coupled with a processor to manage switching logic, monitors shore power quality and automatically switches between shore power and generator power to ensure reliable and safe power distribution, preventing simultaneous supply of both power sources and maintaining fail-safe operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a simple power switch is used to select between generator and shore power, then the device complexity is reduced, but the reliability of power switching control deteriorates due to lack of automated monitoring and fail-safe mechanisms
Solution Approach 1:
The power switching system automatically monitors shore power quality parameters (voltage, frequency, phase) and autonomously decides when to switch between shore power and generator power without requiring manual intervention. The system serves itself by detecting power quality issues and executing switching operations based on pre-programmed logic, eliminating the need for complex manual control while maintaining high reliability through automated fail-safe mechanisms
Solution Approach 2:
The system continuously monitors shore power quality parameters and feeds this information back to the control logic, which automatically adjusts switching operations accordingly. When shore power quality deteriorates below acceptable thresholds, the feedback mechanism triggers an automatic switch to generator power, ensuring reliable operation without requiring complex manual monitoring systems
2Reliability
If automated monitoring and switching logic are implemented, then the reliability of power distribution is improved, but the device complexity increases due to additional controllers, relays, and sensors
Solution Approach 1:
The controller performs multiple functions including monitoring shore power quality parameters (voltage, frequency, phase), making switching decisions, controlling contactor operations, and providing user interface functions through display and buttons. By consolidating these diverse functions into a single multi-functional controller, the system achieves high reliability without proportionally increasing overall device complexity
Solution Approach 2:
The system combines the monitoring, control, and switching functions into an integrated power switching assembly where the controller, contactors, and monitoring circuitry work as a unified system. This merging of functions reduces the number of separate components needed compared to a distributed architecture, achieving reliable automated switching while managing complexity through integration
3Ease of operation
If manual switching operation is used, then the ease of operation is maintained, but the loss of time occurs during power quality issues as users must manually detect and respond to power problems
Solution Approach 1:
The system automatically detects power quality issues and executes switching operations without requiring user intervention. The automated monitoring and control system serves itself by identifying when shore power becomes unavailable or degraded and autonomously switching to generator power, eliminating the time loss associated with manual detection and response while keeping the interface simple for user oversight
Data Source
AI summary
A vehicle includes a mobile electric power generation system including a mobile power source such as a generator. An external power interface is included to connect to an external electrical power source. An AC electric power distribution bus is included to power electric loads of the vehicle and a power switch device is provided to selectively provide AC electric power on the power distribution bus from one of the respective power sources with a default to select one of the sources whenever it is present.