Inverter Control Device Multilayer PCB Overcurrent Protection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional inverter control devices with laminated bus bars lack effective protection against short circuits, leading to overheating issues when applied to printed circuit boards.
Innovation Solution
The inverter control device features a multilayer printed circuit board arrangement where at least one power line wiring downstream of a power shutting means and one ground line wiring upstream of an overcurrent detecting means are positioned to face each other in adjacent layers, allowing for detection and prevention of overheating during short circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If wiring is made by laminated bus bars that extend in parallel to reduce area, then the area occupied by wiring and ground line is reduced, but short circuit of laminated portions causes overheating
Solution Approach 1:
The power line and ground line are divided into multiple segments arranged in different layers of the multilayer printed circuit board. Instead of using continuous laminated bus bars, the wiring is segmented into multiple sections (first power line, second power line, first ground line, second ground line) that are distributed across different layers, reducing the risk of short circuits while maintaining compact area usage.
Solution Approach 2:
The wiring arrangement transitions from a two-dimensional laminated bus bar structure to a three-dimensional multilayer configuration. Power lines and ground lines are positioned in different layers (vertical stacking) rather than only adjacent horizontal positions, reducing short circuit risks while maintaining compact footprint.
2Device complexity
If protection against short circuit is not implemented, then device complexity is reduced, but overheating occurs during short circuit
Solution Approach 1:
Overcurrent detecting means are positioned upstream of the inverter to detect abnormal currents before they cause overheating. Power shutting means are positioned downstream to immediately cut off power supply when short circuits are detected, preventing overheating before it occurs.
Solution Approach 2:
The system implements a feedback control mechanism where overcurrent detecting means continuously monitor the electrical current, and when abnormal conditions are detected, the power shutting means respond by cutting off power supply. This closed-loop feedback system prevents overheating while maintaining relatively simple device structure.
Data Source
AI summary
In a multilayer printed circuit board (circuit board 20) having an inverter (switching elements 22) mounted thereto, only a second wiring pattern P2 arranged downstream of a semiconductor relays 24 and able to shut off an electric power supply and a third wiring pattern P3 arranged upstream of a shunt resistor 27 and able to detect an overcurrent are placed in adjacent layers in a manner to face each other, and thus, even if the mutually facing portions (laminated portion) of the these two wiring patterns P2 and P3 are subjected to short circuit, an overcurrent caused by the short circuit can be detected by the shunt resistor 27 and the electric power supply to the switching elements 22 can be shut off by the switching elements 22, so that overheating at the second and third wiring patterns P2 and P3 can be avoided.