PV Safety Switch with Auxiliary Power Circuit
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Solution Overview
Problem
Existing photovoltaic systems lack a cost-effective and easily deployable solution for safely disconnecting or short-circuiting PV generators in case of unsafe conditions, while ensuring compliance with changing safety regulations and maintaining operational power.
Innovation Solution
The implementation of controllable safety switches that can be deployed between PV generators, with auxiliary power circuits providing power to safety switches and controllers, allowing for safe operation by disconnecting or reconnecting PV generators based on safety regulations, and integrating safety switches into PV system components to reduce costs and complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If safety switches are deployed between PV generators to ensure safe operation, then system safety is improved, but device complexity and cost increase
Solution Approach 1:
The patent integrates the safety switch functionality into existing PV system components such as connectors, junction boxes, or combiner boxes. By merging the safety switch with components that already exist in the PV system, the patent avoids adding separate standalone safety switch devices, thereby improving system safety while minimizing increases in device complexity and cost.
2Reliability
If auxiliary power circuits are added to power safety switches, then operational reliability is improved, but device complexity and cost increase
Solution Approach 1:
The auxiliary power circuit is designed to serve multiple functions: it powers the safety switch control electronics, provides monitoring capabilities, and enables communication functions. By making the auxiliary power circuit multi-functional, the patent improves operational reliability without proportionally increasing device complexity, as a single circuit performs multiple roles.
Solution Approach 2:
The auxiliary power circuit is designed to automatically activate and provide power to the safety switch when needed, without requiring external intervention or complex control systems. The circuit draws power from the PV system itself and automatically manages the safety switch operation, improving reliability while keeping the system simple.
Data Source
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AI summary
Various implementations described herein are directed to a methods and apparatuses for disconnecting, by a device, elements at certain parts of an electrical system. The method may include measuring operational parameters at certain locations within the system and/or receiving messages from control devices indicating a potentially unsafe condition, disconnecting and/or short-circuiting system elements in response, and reconnection the system elements when it is safe to do so. Certain embodiments relate to methods and apparatuses for providing operational power to safety switches during different modes of system operation.