Junction Box Switch Module for Safe DC Power Disconnection
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Solution Overview
Problem
Conventional junction boxes in solar photovoltaic and electric vehicle power systems pose challenges in safely disconnecting high-voltage DC power during fires, risking electric shock and property damage due to the complexity of disconnecting multiple electrical access points.
Innovation Solution
A junction box design with a switch module, including a photoelectric switch and power switch, that allows for serialization and de-serialization of DC power transmission, controlled by a control signal, enabling safe disconnection of power supply units in case of emergencies without requiring extra power.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If multiple electrical access points are connected in series to form high-voltage DC power, then the power transmission capability is improved, but the difficulty of safe disconnection during fires increases
Solution Approach 1:
The patent merges multiple electrical access points into a single controllable junction box unit. Each junction box integrates multiple switches that can simultaneously control all electrical access points, transforming the complexity of managing multiple separate connections into a unified control mechanism. This allows fire personnel to disconnect all connections by operating a single junction box rather than multiple separate access points.
Solution Approach 2:
The junction box acts as an intermediary device between the power supply unit and the electrical access points. It introduces controllable switches as intermediate components that can interrupt the electrical connection without requiring direct manipulation of the high-voltage DC power lines themselves, thereby reducing the risk of electric shock during disconnection operations.
2Reliability
If all electrical access points are disconnected to prevent DC high voltage during fires, then the safety is improved, but the time required for disconnection increases
Solution Approach 1:
The patent combines multiple disconnection operations into a single unified action. By integrating multiple switches within each junction box that can be simultaneously controlled, the system allows all electrical access points to be disconnected through a single operational step, dramatically reducing the time required compared to manually disconnecting each access point separately.
Solution Approach 2:
The junction box is pre-configured with multiple switches positioned and wired to control all electrical access points. This preliminary arrangement ensures that when disconnection is needed, the infrastructure is already in place to execute the disconnection rapidly without requiring complex现场 wiring or sequential operations.
3Device complexity
If conventional junction boxes without switch modules are used, then the device simplicity is maintained, but the ability to control and de-serialize power transmission during emergencies is lost
Solution Approach 1:
The patent transforms the static junction box into a dynamic device by incorporating controllable switches. These switches enable the junction box to adapt its electrical connection state based on operational requirements, allowing it to serialize connections during normal operation for efficient power transmission and de-serialize during emergencies for safety, providing temporal flexibility to the system.
Solution Approach 2:
The switch module enables changes in the electrical connection parameter of the junction box. By controlling the on/off state of the switches, the system can dynamically alter its electrical conductivity and connection topology, transitioning between serialized and de-serialized states to meet different operational and emergency requirements.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution allows for safe and efficient de-serialization of power supply units during fires, reducing the risk of electric shock and property damage by enabling controlled disconnection of high-voltage DC power, thereby enhancing firefighting safety and minimizing damage.
Implementation Method 1
A junction box design with a switch module, including a photoelectric switch and power switch
Data Source
AI summary
A junction box for connecting a power supply unit is disclosed. The junction box includes a first connection terminal, a second connection terminal, a first signal connection terminal, a second signal connection terminal, and a switching module. The first and second connection terminals are utilized to transmit a DC power provided by the power supply unit. The first and second signal connection terminals are utilized to transmit a control signal. The switching module controls the electrically coupling relationship between the first connection terminal and the second terminal according to the control signal. A power system which employs the junction boxes and a method for controlling the power system are also disclosed.