Multi-Output Power Supply for Flexible Garage Door Opener Installation
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Solution Overview
Problem
Movable barrier operators, such as jackshaft-style garage door openers, face installation challenges due to regulatory requirements that necessitate a 120 VAC outlet within 6 feet of the operator, which is costly and inconvenient for DIY installations, especially when no outlets are available nearby.
Innovation Solution
A movable barrier operator system with a multi-output external power supply and monitoring circuitry that allows for flexible installation by combining lower-rated Class 2 outputs to meet Class 1 power requirements, enabling wiring to walls or ceilings beyond 6 feet and ensuring proper power distribution and fault detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a 120 VAC outlet is installed within 6 feet of the movable barrier operator to meet UL and NEC specifications, then the installation complies with regulatory standards, but the installation cost increases and DIY installation becomes impractical
Solution Approach 1:
The power supply system is segmented into multiple Class 2 outputs (e.g., multiple 24VDC outputs) that can be individually connected to existing outlets anywhere in the space. Each output operates independently within Class 2 limits, allowing distributed connection points rather than requiring a single Class 1 outlet within 6 feet of the operator.
Solution Approach 2:
The system changes the electrical parameters by using multiple Class 2 outputs with lower voltage/current ratings that combine to provide the total power needed. This parameter transformation allows connection to existing Class 2 outlets throughout the space rather than requiring a Class 1 outlet within the restricted 6-foot zone.
2Reliability
If the power cord length is limited to 6 feet per UL 325 Standard, then safety requirements are met, but the operator cannot be installed in locations farther from electrical outlets
Solution Approach 1:
The power distribution is segmented into multiple short Class 2 power cords, each connecting to a different existing outlet. Each cord remains within the 6-foot UL limit, but the operator can be positioned anywhere in the space by selecting appropriate outlet connection points, thus maintaining safety compliance while achieving installation flexibility.
Solution Approach 2:
The solution moves from a single-point power connection constraint to a multi-point distribution approach. By utilizing multiple outlets distributed throughout the three-dimensional space of the garage or workspace, the system transforms the location constraint into a flexible spatial arrangement where the operator can be positioned optimally regardless of outlet locations.
3Adaptability or versatility
If multiple Class 2 outputs are combined to meet Class 1 power requirements, then installation flexibility improves, but system complexity increases due to combiner circuitry and monitoring requirements
Solution Approach 1:
Multiple Class 2 power outputs are electrically combined through combiner circuitry to aggregate their power capacity and meet the Class 1 power requirements of the motor. The combiner circuitry integrates the multiple low-power streams into a single high-power supply, enabling flexible installation while providing sufficient power for operation.
Solution Approach 2:
Monitoring circuitry implements feedback by continuously detecting faults in any of the Class 2 outputs and communicating status to the controller. This feedback mechanism ensures safe operation by identifying issues early, allowing the system to maintain reliability while managing the complexity of multiple power inputs through intelligent monitoring and control.
Data Source
AI summary
In one aspect, an external power supply is provided for a movable barrier operator, wherein the movable barrier operator includes a motor configured to be coupled to a movable barrier and move the movable barrier between open and closed positions, the motor having a power rating indicative of a minimum power to be supplied to the motor in order for the motor to move the movable barrier, the external power supply including: a power cord having a plug to connect to a power outlet; and a plurality of outputs each having a power rating indicative of a maximum power the output supplies, the power rating for each output of the plurality being less than the motor power rating, wherein the external power supply is configured to transmit, from the power outlet and through each output, power to the movable barrier operator to provide the motor with the power rating.