Multi-Output Power Supply for Garage Door Opener Wiring Limits
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Solution Overview
Problem
Movable barrier operators, such as jackshaft-style garage door openers, face installation challenges due to regulatory requirements for power cord length and electrical wiring, which can be costly and inconvenient for DIY installations when outlets are not within 6 feet of the mounting location.
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 outputs (Class 2) to meet higher-rated system requirements (Class 1), enabling wiring to be secured to surfaces beyond the 6-foot limit and ensuring compliance with NEC specifications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a 120 VAC outlet is installed within 6 feet of the jackshaft operator mounting location to comply with UL and NEC specifications, then regulatory compliance is achieved, but installation cost and complexity increase significantly
Solution Approach 1:
The power supply system is segmented into multiple lower-power Class 2 outputs instead of requiring a single high-power Class 1 connection. This allows the operator to receive adequate total power through multiple compliant wiring paths, eliminating the need for expensive outlet installation while maintaining NEC compliance.
Solution Approach 2:
Multiple Class 2 power outputs are merged to collectively supply the required power to the jackshaft operator. By combining several lower-rated wiring circuits, the system achieves the necessary total power delivery without requiring any single circuit to exceed Class 2 limitations, thus avoiding the need for additional electrical outlet installation.
2Power
If a 120 VAC outlet is installed within 6 feet of the mounting location, then power delivery capability is sufficient, but installation cost increases
Solution Approach 1:
The power delivery requirement is segmented across multiple Class 2 outputs rather than requiring a single high-power connection. Each output operates within Class 2 power limits, but collectively they provide sufficient total power to the operator, eliminating the need for expensive electrical outlet installation while maintaining adequate power delivery capability.
Solution Approach 2:
The system changes the power delivery parameters by using multiple lower-voltage/current Class 2 outputs instead of a single high-power Class 1 connection. This parameter transformation allows compliance with NEC wiring regulations while achieving the necessary total power delivery through aggregated capacity of multiple circuits.
3Length of stationary object
If multiple lower-rated Class 2 outputs are used to power the operator, then wiring can be secured to surfaces beyond 6 feet, but ensuring adequate total power delivery becomes challenging
Solution Approach 1:
Multiple Class 2 power outputs are merged at the operator to collectively deliver the required total power. The combiner circuitry aggregates the power from several lower-rated wiring circuits, enabling long-distance surface-mounted wiring installation while ensuring adequate total power delivery to drive the garage door operator.
Solution Approach 2:
The power supply system is designed with multi-functionality to accept multiple Class 2 inputs and combine them to satisfy Class 1 power requirements. This universal approach allows flexible wiring configurations of various lengths to be secured to surfaces while maintaining adequate power delivery capability through the combined capacity of multiple outputs.
Data Source
AI summary
In one aspect, a movable barrier operator system is provided that includes a motor configured to be coupled to a movable barrier. The motor has 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 system further includes an external power supply configured to connect to an electrical outlet. The external power supply has a plurality of outputs each having a power rating indicative of a maximum power the output supplies, the output power rating being less than the motor power rating. The movable barrier operator system includes combiner circuitry configured to combine power from the outputs of the external power supply and provide the combined power to the motor. The system further includes a monitoring circuit configured to detect a fault condition of any of the outputs of the external power supply.