PCB Coil Current Detection Between Power Switch Terminals
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Solution Overview
Problem
Existing electronic power devices face challenges in capturing current images without impacting power circuit performance or incurring switching drawbacks.
Innovation Solution
The device integrates a coil on a printed circuit board adjacent to connection terminals, aligned in the same geometric plane, to measure magnetic fields generated by current variations, transforming them into voltage for current information without requiring additional power supply.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a detection apparatus is integrated into the power device to capture current images, then measurement capability is improved, but device complexity and power consumption increase
Solution Approach 1:
The coil is integrated directly onto the printed circuit board adjacent to the connection terminals, merging the detection apparatus with the existing power device structure. This eliminates separate measurement components and reduces overall device complexity while maintaining current measurement capability.
Solution Approach 2:
The coil utilizes the magnetic field naturally generated by current flow through the power switches without requiring external excitation or additional power supply. The detection apparatus serves itself by harvesting energy from the operational magnetic field of the power circuit, thereby avoiding additional power consumption.
2Measurement precision
If a coil is added to measure magnetic field for current detection, then measurement precision is improved, but switching performance deteriorates due to additional components
Solution Approach 1:
The coil is positioned locally adjacent to specific connection terminals where magnetic field measurement is most effective. This localized placement ensures accurate current detection while minimizing the coil's spatial footprint and reducing potential interference with power switch operations.
Solution Approach 2:
The coil acts as an intermediary measurement element that indirectly detects current through magnetic field coupling rather than direct electrical contact. This indirect measurement approach prevents the detection apparatus from interfering with the power circuit's electrical characteristics and switching performance.
3Measurement precision
If traditional detection apparatus is used, then current measurement is achieved, but integration difficulty increases due to separate power supply requirements
Solution Approach 1:
The coil generates its own signal by detecting the magnetic field produced during normal power device operation. No external power supply or excitation source is needed for the detection apparatus, eliminating additional power management requirements and simplifying integration into the existing power device architecture.
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
This approach allows for easier integration and optimized control of power circuits by providing current variation and level information without affecting switching performance.
Implementation Method 1
the coil is configured to measure the magnetic field existing between said terminals in said plane
Data Source
AI summary
The electronic power device comprises a first power switch and a second power switch connected in series between first and second connection terminals of the device, and a detection apparatus comprising at least one coil associated with the first and second connection terminals, and an electronic processing circuit configured to detect an electrical voltage measured by said coil. The coil is mounted on a printed circuit board adjacent said first and second connection terminals and aligned, substantially in the same geometric plane as said printed circuit board. The coil is configured to measure the magnetic field existing between said terminals in said plane.