Inverter Junction Box Layout for Multi-Directional HV Wiring
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Solution Overview
Problem
Conventional inverter junction boxes have a single high-voltage harness direction, which cannot meet the multi-directional wiring requirements and lacks high-voltage protection functionality.
Innovation Solution
An inverter junction box design featuring a casing, cover plate, knockout pin, and high-voltage busbar terminal, allowing for multi-directional wiring and high-voltage protection through the cooperation of the knockout pin and protection device on the inverter.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a single high-voltage harness direction is used in conventional inverter junction boxes, then the structure is simple, but it cannot meet the multi-directional wiring requirements
Solution Approach 1:
The junction box is designed with multiple connecting parts (first connecting part, second connecting part, third connecting part) that can be connected to external cables from different directions. The casing structure accommodates multiple busbar terminals arranged in different spatial orientations, enabling the single junction box to perform multiple wiring functions simultaneously, thus achieving multi-directional wiring adaptability without requiring multiple separate junction boxes
2Ease of operation
If the cover plate is opened for wire connection, then wire connection is accessible, but high-voltage safety is compromised
Solution Approach 1:
The knockout pin is pre-installed in the cover plate and mechanically linked to the protection device. When the cover plate is opened, the knockout pin automatically moves to trigger the protection device, which preliminarily cuts off high-voltage power before the wire connection operation begins. This preliminary action ensures that high-voltage safety is maintained during the wire connection process, allowing easy operation without compromising safety
Solution Approach 2:
The protection device provides immediate feedback when the cover plate is opened by detecting the movement of the knockout pin. This feedback mechanism automatically activates the high-voltage cutoff function, creating a closed-loop safety system that responds to the cover plate opening action, ensuring that wire connection accessibility does not compromise high-voltage safety
Data Source
AI summary
An inverter junction box is provided that includes a cover plate and a knockout pin. The cover plate is detachably connected with a top part of a casing; the knockout pin has one end that is detachably connected with a bottom part of the cover plate, and another end that can abut against a protection device on an inverter. One side of the casing has a connecting part that is connected with an external cable. A bottom part of the casing is a hollow structure and abuts against an incoming terminal of the inverter.