Non-contact AC/DC Sensing Probe with Segmented Hall Detection
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Solution Overview
Problem
Existing clamp-type current measuring devices based on the Hall effect cannot directly measure AC/DC currents on cables with multiple wires, as the magnetic fields from multiple wires cancel each other out, resulting in inaccurate readings and the need to peel off insulation for separate wire measurements.
Innovation Solution
A non-contact AC/DC sensing probe and method that uses a Hall sensing module within a sealed shielding space to detect electromagnetic signals from individual wires within a cable, allowing for accurate measurement of AC/DC currents without physical contact or disconnection of the cable.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a clamp-type current measuring device based on the Hall effect is used to measure multiple wires simultaneously, then the measurement process is simplified, but the magnetic fields from multiple wires cancel each other out resulting in zero reading
Solution Approach 1:
The probe divides the cable into multiple independent detection regions using partition walls, allowing each Hall sensing module to measure individual wire currents separately. This segmentation enables the device to maintain both operational simplicity and measurement accuracy when measuring multiple wires simultaneously.
Solution Approach 2:
Different regions within the probe are assigned different functions: some regions contain Hall sensing modules for current measurement, while partition walls provide magnetic shielding. This local differentiation allows the probe to selectively measure specific wires while blocking interference from others, resolving the cancellation issue.
2Measurement precision
If insulation protective layer is peeled off to measure each wire separately, then accurate current measurement is achieved, but operation becomes cumbersome and safety is compromised
Solution Approach 1:
The probe introduces magnetic shielding partitions as an intermediary element between the wires and Hall sensing modules. This mediator allows the device to measure individual wire currents accurately without physical contact or insulation removal, maintaining both safety and operational convenience.
Solution Approach 2:
The invention replaces the mechanical approach of peeling insulation with a magnetic field-based measurement system. Hall sensing modules detect currents through the insulation layer non-contactly, eliminating the need for physical manipulation of the cable while maintaining measurement accuracy.
3Adaptability or versatility
If a traditional Hall effect current clamp measures AC/DC current, then the measurement function is achieved, but the device cannot distinguish between multiple wires in a cable
Solution Approach 1:
The probe uses partition walls to segment the measurement space into independent regions, each corresponding to a specific wire. This segmentation preserves individual wire current information that would otherwise be lost in the combined magnetic field measurement of traditional clamps.
Solution Approach 2:
The probe is designed with multiple Hall sensing modules and partition walls that enable it to measure both single wires and multi-wire cables simultaneously. This multi-functional design maintains adaptability while preventing information loss about individual wire currents.
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
Enables direct and accurate measurement of AC/DC currents on single wires or cables with multiple wires, avoiding the need to peel insulation, ensuring safety, and providing high precision and convenience in current measurement.
Implementation Method 1
a Hall sensing module that can collect the electromagnetic signal passing through the detection port to enter the shielding space
Implementation Method 2
constructing a sealed shielding space for preventing electromagnetic interference
Data Source
AI summary
The present invention discloses a non-contact AC/DC sensing probe and a sensing method and application thereof. The non-contact AC/DC sensing probe adopts a Hall sensing module, breaks through the limitation that a traditional induction coil can sense only an AC current, and can directly perform AC/DC sensing on a single wire or a cable composed of two or more wires, so as to allow the target wire to generate an electromagnetic signal to be collected by the Hall sensing module, and sensing of electrical parameters, including a current, a voltage, a frequency, a duty cycle, a phase, a harmonic, a frequency-conversion signal, etc. is realized without peeling and cable branching, so that the non-contact AC/DC current sensing probe is simple and convenient to operate, can be applied to measuring instruments such as a test pen, a multimeter and a clamp meter, and has a wide range of applications.