Active EMI Compensation With Digital Common-Mode Noise Data
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Solution Overview
Problem
Existing active EMI filters only compensate for EMI noise through current/voltage without collecting information about the noise, making it difficult to monitor or utilize the noise data effectively.
Innovation Solution
An active compensation device with a sensing unit, IC unit, and compensation unit that generates and outputs noise data digitally, allowing for the collection and utilization of EMI noise data.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If passive CM choke is used to reduce CM noise, then noise reduction performance is achieved, but the size and price of EMI filters are greatly increased in high-power/high-current systems
Solution Approach 1:
The patent replaces the passive mechanical CM choke with an active compensation device that uses electronic amplification and digital signal processing to generate compensation signals, eliminating the need for large magnetic components while maintaining noise reduction performance
Solution Approach 2:
The invention changes the operating parameters by using active electronic components with high current amplification capability to generate compensation signals that match the high-current path characteristics, avoiding the size constraints of passive inductors
2Reliability
If existing active EMI filters are used for noise compensation, then current/voltage compensation is achieved, but information about the noise cannot be collected
Solution Approach 1:
The active compensation device performs multiple functions simultaneously: it generates compensation signals for noise cancellation while also collecting, processing, and outputting noise data in digital format, making the device both a compensator and a monitoring system
Solution Approach 2:
The device incorporates feedback mechanisms where the sensing unit continuously monitors the high-current path, the digital circuit processes the noise information, and the compensation unit adjusts the compensation signal based on the processed data, creating a closed-loop system that both compensates and collects noise information
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 the collection and utilization of EMI noise data for monitoring changes, emergency situations, and big data processing, enhancing the effectiveness of noise cancellation.
Implementation Method 1
a sensing unit configured to generate an output signal corresponding to a common-mode noise signal on the high-current path
Implementation Method 2
an amplification unit configured to output an amplified signal obtained by amplifying the output signal
Implementation Method 3
an analog-to-digital converter; and an input buffer configured to receive the output signal and attenuate the output signal into a low-voltage analog signal that is usable for the analog-to-digital converter
Data Source
AI summary
The present disclosure provides an active compensation device for actively compensating for noise generated in a common mode in each of at least two high-current paths. The active compensation device includes a sensing unit configured to generate an output signal corresponding to a common-mode noise signal on the high-current path, an integrated circuit (IC) unit including an amplification unit configured to output an amplified signal obtained by amplifying the output signal, and a digital circuit unit configured to output noise data into which the output signal is digitally converted, and a compensation unit configured to draw a compensation current out of the high-current path or generate a compensation voltage on the high-current path, based on the amplified signal. The noise data is provided to an external device.