Communication Apparatus Bridging Circuit EMI Compensation
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Solution Overview
Problem
Conventional communication products face issues with electromagnetic interference (EMI) and echo phenomena due to current mismatch and asymmetric loading terminal impedances, which are not effectively addressed by existing passive shielding methods, leading to increased manufacturing costs and subpar EMI protection.
Innovation Solution
A communication apparatus with a bridging circuit and measurement circuit that estimates and adjusts the positive and negative loading resistances to match the ideal impedance, ensuring equivalent loading currents and eliminating EMI and echo phenomena by dynamically adjusting resistance settings based on estimated loading resistances.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If passive shielding methods are used to protect against EMI, then EMI protection is provided, but manufacturing costs increase and the solution is subpar
Solution Approach 1:
The patent replaces passive mechanical shielding structures with an active electronic compensation system. The measurement circuit detects voltage differences caused by EMI, and the control circuit dynamically adjusts resistance values to compensate for the interference, substituting physical shielding with electronic signal processing.
Solution Approach 2:
The patent dynamically changes resistance parameters in real-time based on measured EMI conditions. The control circuit adjusts the resistance values of the loading terminals to match ideal impedance values, adapting the electrical parameters to compensate for environmental interference without requiring physical shielding.
2Object-affected harmful factors
If transformer is used for coupling, then EMI protection is improved, but cost increases
Solution Approach 1:
The patent replaces expensive transformers with inexpensive resistive loading circuits and measurement circuits. The solution uses simple voltage dividers and microcontroller-based control to achieve EMI compensation, substituting costly passive components with affordable active electronic components.
Solution Approach 2:
The patent substitutes the magnetic coupling mechanism of transformers with an electronic measurement and control system. Instead of relying on magnetic fields and inductive coupling, the system uses voltage measurement and digital resistance control to achieve the same EMI protection function at lower cost.
3Ease of manufacture
If AC coupling mechanism is used, then cost is reduced, but current mismatch and EMI problems arise
Solution Approach 1:
The patent implements a feedback loop where the measurement circuit continuously monitors the voltage at the loading terminals, and the control circuit adjusts the resistance values based on the measured deviations. This closed-loop control compensates for current mismatch and EMI effects that would otherwise plague AC-coupled systems.
Solution Approach 2:
The patent dynamically changes the resistance parameters of the loading terminals to maintain optimal current balance and impedance matching. By adjusting the resistance values in real-time, the system compensates for the inherent deficiencies of AC coupling, eliminating current mismatch and EMI problems while keeping costs low.
4Device complexity
If fixed impedance values are used, then design is simplified, but current mismatch occurs due to tolerance variations
Solution Approach 1:
The patent transitions from static fixed impedance values to dynamic adjustable impedance. The loading terminals use variable resistors or digitally controlled resistors that can change their resistance values during operation, allowing the system to adapt to actual conditions and maintain current matching accuracy despite component tolerances.
Solution Approach 2:
The patent uses feedback from the measurement circuit to continuously monitor and adjust the impedance values. The control circuit compares the measured voltages and adjusts the loading terminal resistances to achieve balanced currents, compensating for initial tolerance variations in the fixed components while maintaining overall design simplicity.
Data Source
AI summary
A communication apparatus and an associated estimation method are provided. The communication apparatus is electrically connected to a loading terminal and operates at a common bias voltage. The communication apparatus includes a transmitter, a connector, and a receiver. The connector includes a bridging circuit and a measurement circuit. The bridging circuit has a positive measurement end and a negative measurement end. The transmitter transmits an analog output signal. The receiver receives a common bias voltage during an estimation process. During the estimation process, the measurement circuit estimates a positive loading resistance and a negative loading resistance corresponding to the loading terminal according to a voltage difference between the common bias voltage and voltage at one of the positive measurement end and the negative measurement end.