Common Mode Inductor with Sensor Windings for Signal Measurement
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Solution Overview
Problem
Existing communication methods in power inverter systems are costly and energy inefficient, and they fail to effectively suppress common mode noise while transmitting differential mode signals.
Innovation Solution
A common mode inductor system with additional sensor windings that measure differential mode communication signals within the existing power line infrastructure, eliminating the need for separate communication channels and sensing devices, and allowing for simultaneous suppression of common mode noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate communication channels and sensing devices are used, then communication signal transmission is achieved, but system cost and complexity increase
Solution Approach 1:
The common mode inductor is designed to perform multiple functions: it suppresses common mode noise while simultaneously enabling differential mode communication signal transmission and measurement through additional sensor windings. This multi-functional approach eliminates the need for separate communication channels and sensing devices, reducing system complexity while maintaining reliability
Solution Approach 2:
The patent combines the noise suppression function and communication signal measurement function into a single common mode inductor component. By integrating sensor windings into the existing inductor structure, the solution merges previously separate functions (noise filtering and signal sensing) into one unified component, thereby reducing overall system complexity
2Measurement precision
If additional sensing devices and communication channels are added, then signal measurement capability is improved, but manufacturing cost increases
Solution Approach 1:
The common mode inductor is designed to perform multiple functions: it suppresses common mode noise while simultaneously enabling differential mode communication signal transmission and measurement through additional sensor windings. This multi-functional approach eliminates the need for separate communication channels and sensing devices, reducing system complexity while maintaining reliability
Solution Approach 2:
The patent combines the noise suppression function and communication signal measurement function into a single common mode inductor component. By integrating sensor windings into the existing inductor structure, the solution merges previously separate functions (noise filtering and signal sensing) into one unified component, thereby reducing overall system complexity
3Loss of information
If conventional communication methods are used in power inverter systems, then information transfer is achieved, but energy consumption increases
Solution Approach 1:
The system uses the existing power line infrastructure and common mode inductor components to simultaneously perform noise suppression and communication signal measurement. By leveraging existing components for dual purposes, the solution eliminates the need for additional active communication devices that would consume extra energy, achieving energy-efficient information transfer
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 solution enables efficient transmission and measurement of differential mode signals, reducing costs and energy consumption while effectively suppressing common mode noise, and allows for real-time monitoring and control of power inverter systems.
Implementation Method 1
a differential signal, which could be understood as a signal with different signs in the first winding and the second winding, the fields may to a large extend cancel each other
Implementation Method 2
the third and fourth windings may be inductively coupled to the first and second windings, respectively, so as to provide a transforming effect
Implementation Method 3
a common mode signal may be understood as a signal having the same sign in both the first winding and the second winding. The fields generated by such a signal may add in the core the inductor which consequently may act as a high impedance component blocking or attenuating the signal
Data Source
Figure 1~2
Figure 3
Figure 4~5
AI summary
A common mode inductor (10) for suppression of common mode noise and transmission of a differential signal is disclosed. The inductor comprises a core (15) with a first and second winding(11, 12), wherein the first winding and the second winding forms a pair of conductors arranged to convey a differential communication signal. Further, a third and fourth winding (13, 14) is arranged to extend along at least a portion of the first and second winding, respectively. The third winding and the fourth winding may be locally inductively coupled to the first winding and the second winding, respectively. Moreover, the third winding and the fourth winding are connected in series with each other so that differential signal on the first and second windings transformed to the third and fourth winding maybe added to each other. The third and fourth winding may hence provide a sensor signal induced by the differential communication signal in the first winding and the second winding. A system (100) comprising the common mode inductor and a method for measuring a differential signal in said inductor is also disclosed.