Insulating Inverter Enclosure Eliminates Grounding
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The existing photovoltaic (PV) systems require costly and time-consuming custom-made AC cabling and grounding, which is prone to errors, and involve complex wiring due to the need for a ground connection.
Innovation Solution
A power conversion system using insulating material enclosures for inverters, eliminating the need for grounding and reducing AC wiring to two line voltage carrying wires, with a bulkhead connector interface assembly and overmolded Y-splice connectors for efficient cabling and simplified installation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If custom-made AC cabling and grounding connections are used in PV systems, then safety standards are met and power conversion is achieved, but installation time increases, costs increase, and error potential increases
Solution Approach 1:
The patent removes the grounding requirement entirely by using an insulating enclosure for the inverter. This extraction of the grounding component eliminates the associated installation time, cost, and error potential while maintaining safety through the insulating barrier that prevents electrical contact with the enclosure.
Solution Approach 2:
The patent changes the electrical parameter of the enclosure from conductive to insulating. By using an insulating enclosure, the system transforms the enclosure's electrical properties to eliminate the need for grounding connections, thereby reducing installation complexity and time while maintaining safety standards.
2Reliability
If grounding connections are implemented for all exposed metal surfaces, then safety standards are satisfied, but wiring complexity and installation costs increase
Solution Approach 1:
The patent extracts the grounding requirement by using an insulating enclosure. This eliminates the need for grounding wires and connections for the inverter enclosure, significantly reducing wiring complexity and installation costs while maintaining safety through the insulating barrier.
Solution Approach 2:
The patent changes the electrical parameter of the enclosure material from conductive to insulating. This parameter change fundamentally alters the safety approach from active grounding to passive insulation, eliminating complex wiring requirements while satisfying safety standards.
3Adaptability or versatility
If AC cable is custom-made and assembled in the field, then system requirements are met, but material costs and labor costs increase
Solution Approach 1:
The patent removes the grounding component from the AC cabling requirement. By using an insulating enclosure, the system eliminates the need for custom ground wire assembly, reducing material costs and labor costs while maintaining the ability to configure systems of different sizes using standard two-wire AC cables.
Solution Approach 2:
The patent changes the enclosure's electrical parameter to insulating, which fundamentally simplifies the AC cabling requirements. This allows use of simpler, less expensive cable assemblies without custom grounding wires, reducing both material and installation costs while maintaining system adaptability.
Data Source
AI summary
A system and apparatus for power conversion without a connection to ground. In one embodiment, the apparatus comprises an inverter having an enclosure formed from an insulating material, wherein the inverter receives a DC input and generates, from the DC input and without any ground connection, a first AC line voltage carrying output and a second AC line voltage carrying output.