Push-Pull Transmitter Circuit for Reflection Signal Attenuation

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Solution Overview

Problem

Existing communication systems face issues with reflection signals contaminating communication signals due to impedance mismatch, leading to noise and reduced communication quality, and existing countermeasures often require complex circuit configurations or adjustments for different electrical line lengths.

Innovation Solution

A communication system with a push-pull transmitter circuit and receiver circuit, incorporating rectifier and voltage cap elements to attenuate reflection signals by biasing them outwards of the communication signal amplitude, using rectifier elements in series and voltage cap elements in parallel to add or subtract capping voltages equal to approximately 1.5 to 3 times the signal boundaries.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If rectifier elements and voltage cap elements are added to attenuate reflection signals, then communication signal integrity is improved, but device complexity increases

Engineering Contradiction:

Improvecommunication signal integrityVSAvoidcircuit configuration

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent converts harmful reflection signals into beneficial effects by using rectifier elements to convert AC reflection signals into DC voltage, and voltage cap elements to generate capping voltages that actively counteract the reflection signals. This transforms the harmful impedance mismatch problem into a controllable voltage regulation mechanism that protects the receiver.

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

Solution Approach 2:

The patent introduces rectifier elements and voltage cap elements as intermediary components between the transmission line and the receiver. These intermediaries process the reflection signals before they reach the receiver, converting and regulating the harmful signals into safe voltage levels that can be tolerated by the communication system.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Reliability

If conventional countermeasures are used to attenuate reflection signals, then communication quality is improved, but circuit changes are required for different electrical line lengths

Engineering Contradiction:

Improvecommunication qualityVSAvoidadaptability to different line lengths

Core Design Contradiction:

ReliabilityVSAdaptability or versatility

Solution Approach 1:

The patent creates a universal reflection signal attenuation mechanism that works across different electrical line lengths and impedance conditions. The rectifier elements and voltage cap elements form a generalized solution that adapts to various transmission line configurations without requiring circuit redesign, making the system versatile for different communication scenarios.

Inventive Principle:

Principle #6Universality (Multi-functionality)

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

Attenuates reflection signals effectively without requiring circuit changes for different electrical line lengths, maintaining communication signal integrity and preventing contamination, thus ensuring reliable long-distance transmission and bus branching.

Implementation Method 1

first and second rectifier elements connected in series to the high-side drive element and the low-side drive element, respectively, and configured to prevent the reflection signals from flowing back to a power supply side

Methodology Applied

Scientific EffectRectification: Diode

Implementation Method 2

first and second voltage cap elements connected in parallel to the high-side drive element and the low-side drive element, respectively, and configured to add or subtract capping voltages, equal to approximately 1.5 to 3 times upper or lower boundaries (e.g., voltages) for a HIGH level voltage of the communication signals, to or from the boundaries

Methodology Applied

Scientific EffectVoltage clamping:

Data Source

PatentUS20260100866A1Communication system

Publication Date: 2026.04.09 SICK OPTEX

AI summary

The communication system includes a push-pull transmitter circuit (2) that includes a reflection signal attenuator circuit (10) configured to keep the reflection signals outside of the amplitude direction of communication signals to prevent contamination thereof. The reflection signal attenuator circuit (10) includes first and second rectifier elements (D1 and D2) connected in series to a high-side drive element and a low-side drive element (Q1 and Q2), respectively, to prevent the reflection signals from the communication signals from flowing back to a power supply side, and first and second voltage cap elements (ZD1 and ZD2) connected in parallel to the high-side drive element and the low-side drive element (Q1 and Q2), respectively, to provide (add or subtract) capping voltages equal to approximately 1.5 to 3 times upper or lower boundaries for a HIGH level voltage of the communication signals when passing the reflection signals from the communication signals therethrough.