Cord clamp current sensor for dust collector
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Solution Overview
Problem
Existing dust collection systems require users to disconnect power tools from the source and connect them to a special-purpose socket, adding cost and inconvenience, and limiting current handling capacity.
Innovation Solution
A dust collection system using a clamp sensor that snaps around the power tool's cord to measure current flow, eliminating the need for a special-purpose socket and allowing the power tool to be plugged into a separate electrical outlet, with a detection circuit that turns on the dust collector motor when current exceeds a threshold.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a special-purpose socket is used to connect power tool to dust collector, then current measurement is enabled, but device complexity and cost increase
Solution Approach 1:
The current measurement function is extracted from the dust collector and implemented as a separate clamp-on sensor that can be independently attached to the power cord. This separates the measurement capability from the main dust collector unit, reducing its complexity while maintaining measurement functionality.
Solution Approach 2:
A clamp-on current sensor acts as an intermediary device between the power cord and the dust collector control system. It measures current through the cord and transmits signals to the dust collector, enabling current-based control without requiring a special socket integration.
2Reliability
If power tool is connected to dust collector via special socket, then dust collection is enabled, but current handling capacity is limited
Solution Approach 1:
The dust collection system is decoupled from the power tool connection. The dust collector operates independently based on current detection signals from the clamp sensor, allowing the power tool to draw power from any outlet without being constrained by the dust collector's socket current rating.
Solution Approach 2:
The clamp-on current sensor serves as an intermediary that monitors power consumption without being part of the power transmission path. This allows the system to detect when the power tool is operating and activate the dust collector accordingly, without the physical connection limiting current capacity.
3Measurement precision
If AC line splitter with current transformer is used, then current measurement is achieved, but ease of operation deteriorates
Solution Approach 1:
The clamp-on current sensor acts as a convenient intermediary that can be quickly attached to or removed from the power cord without requiring electrical connections or modifications to the outlet. This maintains ease of operation while enabling current measurement.
Solution Approach 2:
The mechanical connection requirement of AC line splitters is replaced with a magnetic field-based measurement approach. The clamp sensor measures current through electromagnetic induction around the conductor, eliminating the need for physical disconnection and reconnection of electrical outlets.
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 cost-effective and convenient dust collection by allowing the power tool to operate on a higher current branch circuit without the need for a special socket, improving user convenience and current handling capacity.
Implementation Method 1
The electromagnetic element senses current flow in the cord
Data Source
Figure 1A~1B
Figure 2A
Figure 2B
AI summary
A dust collection system includes a sensor body, a selection circuit, a detection circuit, and a motor control circuit. The sensor body detachably encircles a cord supplying power to a power tool. The cord includes a neutral conductor and a hot conductor. The sensor body houses sensors that, in response to current flow through the cord, generate sensor signals. The selection circuit generates a positive output signal in response to the sensor signals and generates a negative output signal in response to the sensor signals. The detection circuit generates a current detection signal in response to a comparison of the positive and negative output signals with a threshold. The motor control circuit selectively turns on a motor of the dust collection system in response to the current detection signal.