Common-Mode Coil Bypass for Magnetic Saturation Prevention
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Solution Overview
Problem
Existing noise suppression devices struggle to reliably suppress common mode current when there is high impedance on the power supply side, leading to magnetic saturation in common mode coils.
Innovation Solution
A noise suppression device with a common mode coil connected between a power supply and a control device, featuring an electronic device in parallel that diverts low frequency current away from the common mode coils, using a calculation device to detect and bypass low frequency current through an electronic device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If voltage is applied to a wire to cancel out the voltage applied to common mode coils, then common mode current suppression is achieved, but magnetic saturation occurs in the common mode coils when there is high impedance on the power supply side
Solution Approach 1:
The invention divides the common mode current into two frequency components: low frequency current and high frequency current. The low frequency current flows through the common mode coil wire (not through the magnetic core), while the high frequency current is suppressed by the common mode coil. This segmentation prevents magnetic saturation caused by low frequency current while maintaining suppression effectiveness for high frequency noise.
Solution Approach 2:
The invention introduces a wire as an intermediary element that carries the low frequency current between the power supply and control device. By routing the low frequency current through this separate wire rather than through the common mode coil's magnetic path, the magnetic core is protected from saturation while the noise suppression function remains intact.
2Object-affected harmful factors
If common mode coils are used to suppress high frequency noise, then electromagnetic interference is reduced, but the device complexity increases due to the need for additional components and wiring
Solution Approach 1:
The common mode coil structure is designed to serve multiple functions simultaneously: it suppresses high frequency electromagnetic interference while allowing low frequency current to pass through the wire without causing magnetic saturation. This multi-functionality reduces the need for additional separate components to handle different frequency ranges.
Solution Approach 2:
The invention combines the noise suppression function with the existing power supply wiring structure. The common mode coil is integrated into the power supply line, and the low frequency current path is merged with the existing wiring, minimizing additional device complexity while achieving effective noise suppression.
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 prevents magnetic saturation in common mode coils, allowing for reliable suppression of high frequency common mode current while maintaining compactness and reducing heat generation.
Implementation Method 1
a common mode coil connected between a power supply and a control device
Implementation Method 2
it is possible to prevent magnetic saturation in the common mode coils
Data Source
AI summary
Provided is a noise suppression device capable of suppressing a common mode current with higher certainty. The noise suppression device includes a common mode coil connected between a power supply and a control device; and an electronic device which is connected in parallel with the common mode coil and in which a low frequency current of a current flowing between the power supply and the control device flows. In the noise suppression device, the low frequency current of the current flowing between the power supply and the control device flows in the electronic device. It is therefore possible to suppress the common mode current with higher certainty.