Two-Wire Driver Circuit With Adaptive Edge Shaping for Common-Mode Response
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Solution Overview
Problem
Existing driver circuits for two-wire conductors, particularly in bus systems like USB and CAN bus, face challenges in achieving satisfactory common mode response due to space, weight, and cost constraints, as well as instability issues with passive and active circuit assemblies.
Innovation Solution
A driver circuit with two output stages and a controller that generates complementary output currents, adjusts current amperage, analyzes output voltages to create error signals, and caches these signals to optimize output current adjustments, thereby improving common mode response and reducing electromagnetic interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If passive common mode chokes are employed to improve common mode response, then common mode response is improved, but space, weight and costs increase
Solution Approach 1:
The patent replaces passive mechanical/common mode choke components with an active electronic control system that uses controllers to generate compensating signals. This substitution eliminates the need for heavy passive components while achieving the same common mode response improvement through electronic signal processing.
Solution Approach 2:
The patent dynamically adjusts output current parameters using controllers that modify current characteristics in real-time. By changing electrical parameters through active control rather than using fixed passive components, the system achieves improved common mode response without the weight penalty of traditional chokes.
2Reliability
If passive common mode chokes are employed to improve common mode response, then common mode response is improved, but device complexity and costs increase
Solution Approach 1:
The patent replaces complex passive common mode choke assemblies with a streamlined active control system using controllers that generate compensating signals. This substitution reduces device complexity by eliminating multiple passive components while maintaining common mode response performance through electronic control.
3Reliability
If active circuit assemblies are used to improve common mode response, then common mode response is improved, but stability deteriorates due to unsatisfactory common mode response in some cases
Solution Approach 1:
The patent implements feedback mechanisms where controllers monitor output currents and generate compensating signals based on detected common mode disturbances. This feedback loop stabilizes the system by continuously adjusting output parameters to maintain satisfactory common mode response under varying operating conditions.
Solution Approach 2:
The patent uses controllers to preemptively generate compensating signals that counteract potential common mode disturbances before they affect system stability. By taking preliminary action through predictive control, the system maintains stable operation across different operating scenarios.
Data Source
AI summary
A driver circuit and method for generating two complementary output currents from a two-state logic input signal at two outputs for connecting a two-wire conductor provide the following actions: generating from the input signal, an output signal at each output, the amperage of one of the output currents being adjustable by a control signal; analyzing each voltage materializing at the outputs; generating an error signal as a function of the output voltages within each of at least two time slots subsequent to a change in state of the input signal; caching the error signals or signals derived therefrom and adjusting, as a function of cached error signals or of the cached signals as a function thereof, the output current in corresponding time slots subsequent to a resulting change in state of the input signal.