Backup Power PCB Layout Using a Semi-Closed Rogowski Coil
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Solution Overview
Problem
Existing backup power devices face challenges with large component counts, high costs, and significant board area occupation due to the use of sampling resistors and current transformers for current detection, limiting their widespread application.
Innovation Solution
A backup power device utilizing a semi-closed Rogowski coil and regulation circuit, perpendicular to the power board, for current detection, coupled with a controller to manage switching components based on detection signals, reducing board area and cost while ensuring safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a sampling resistor or current transformer is used for current detection, then the current detection function is effective, but the board area occupied is large and the cost is high
Solution Approach 1:
The patent extracts the current detection function from traditional components (sampling resistor or current transformer) and implements it using a Rogowski coil that can be integrated directly onto the PCB board. This extraction allows the detection function to be achieved with minimal additional board area, as the Rogowski coil uses trace patterns on the PCB itself rather than requiring separate discrete components.
Solution Approach 2:
The patent merges the current detection function with the existing PCB structure by integrating the Rogowski coil traces directly into the board layout. The coil traces are combined with the power circuit traces, allowing dual functionality without requiring separate detection circuitry. This merging eliminates the need for additional components and reduces overall board area occupation.
2Measurement precision
If a sampling resistor or current transformer is used for current detection, then the current detection function is effective, but the cost is high
Solution Approach 1:
The patent replaces expensive current transformers or sampling resistors with a cost-effective Rogowski coil implementation using standard PCB trace materials. The coil is constructed from copper traces on the PCB substrate, eliminating the need for costly magnetic cores, windings, and shielding that characterize traditional current detection components. This approach significantly reduces component costs while maintaining detection accuracy.
Solution Approach 2:
The patent substitutes the mechanical construction of traditional current transformers (physical windings, magnetic cores, assembly processes) with a planar electromagnetic structure fabricated through standard PCB manufacturing processes. This substitution eliminates complex mechanical assembly steps and reduces manufacturing costs by utilizing automated PCB fabrication techniques for coil trace creation.
3Ease of manufacture
If a semi-closed Rogowski coil is used, then the cost is reduced and board area is minimized, but the current detection function must be effectively implemented
Solution Approach 1:
The patent transitions from traditional three-dimensional current transformer structures to a two-dimensional planar Rogowski coil configuration on the PCB surface. By utilizing the planar dimension of the PCB board, the coil traces can be routed to form the detection structure without requiring vertical space or thick components. This dimensional change enables effective current detection while minimizing board area occupation and reducing manufacturing complexity.
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 provides effective current detection with reduced board space, enabling miniaturization and lower costs, enhancing safety and reliability in power devices with high space constraints.
Implementation Method 1
the semi-closed Rogowski coil crosses the conductive wire, and is configured to: induce a current in the conductive wire and generate an induction signal
Data Source
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AI summary
This application relates to the field of energy technologies, and provides a backup power device and a photovoltaic system, to resolve problems such as high costs and a large occupied board area of a power board assembly in the backup power device. The backup power device provided in this application includes a power board and a regulation board. The regulation board is perpendicularly disposed on a surface of the power board. The power board includes a conductive wire and a switching component. The regulation board includes a semi-closed Rogowski coil and a regulation circuit. The semi-closed Rogowski coil crosses the conductive wire, and is configured to: induce a current in the conductive wire and generate an induction signal. The regulation circuit is configured to performing operation processing on the induction signal for output. The power board assembly further includes a controller, where the controller is connected to the regulation circuit and the switching component, and is configured to control on or off of the switching component based on an output signal of the regulation circuit. In the backup power device provided in this application, the semi-closed Rogowski coil has an advantage of low costs, which is conducive to wide application. The regulation board and the power board are perpendicularly disposed, occupying a small board area.