Bidirectional AC Voltage Encoding for Electrical Installation Feedback
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Solution Overview
Problem
Existing electrical installation systems lack the capability to provide status feedback on the switching status of actuators controlled by extensions without additional wiring effort, limiting user confirmation of command receipt and implementation.
Innovation Solution
The method utilizes the unused AC voltage half-wave for feedback, encoding information with complementary polarity to transmit status updates from the main unit to the extension, allowing simple voltage measurement for feedback reading, with the option to use different voltage levels for multiple states and display via optical or acoustic means.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If the same AC voltage half-waves are used for command transmission from extension to main unit, then control commands can be transmitted reliably, but status feedback from main unit to extension is not possible without additional wiring
Solution Approach 1:
The patent applies periodic action by utilizing the periodic AC voltage waveform and its complementary half-waves for bidirectional communication. Command half-waves (e.g., negative half-cycles) transmit control commands from extension to main unit, while feedback half-waves (e.g., positive half-cycles) transmit status feedback from main unit to extension. This periodic alternation enables full-duplex communication over the same wiring infrastructure without requiring additional wires.
Solution Approach 2:
The patent implements multi-functionality by making the existing two-wire connection serve dual purposes: it simultaneously carries both command signals from extension to main unit and status feedback signals from main unit to extension. By encoding different types of information in different half-waves of the AC voltage, the same physical wiring infrastructure performs multiple communication functions that would traditionally require separate dedicated lines.
2Reliability
If additional wiring is added to enable status feedback, then bidirectional communication is achieved, but installation complexity and cost increase
Solution Approach 1:
The patent applies self-service by enabling the existing wiring infrastructure to provide its own feedback capability without requiring external additions. The main unit utilizes the return path of the existing AC voltage connection to transmit status feedback information back to the extension. This self-service approach allows the system to achieve bidirectional communication using only the originally installed two-wire connection, eliminating the need for additional feedback wires or complex installation modifications.
3Loss of information
If voltage levels are varied to represent multiple states, then more information can be transmitted, but measurement precision requirements increase
Solution Approach 1:
The patent applies parameter changes by varying voltage levels within the feedback half-waves to encode different actuator states. For example, different voltage magnitudes or polarity patterns in the feedback half-cycles represent different operational states (on, off, intermediate positions). This parameter variation enables the transmission of multiple bits of information per feedback cycle, increasing the information capacity of the communication channel while using the existing voltage-coded infrastructure.
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 bidirectional communication without additional wiring, ensuring users receive confirmation of command execution and allowing seamless operation of multiple extensions and main units within existing 3-wire systems, enhancing system reliability and user interaction.
Implementation Method 1
the control commands to a the extension with the electrical line connecting the main office is voltage-coded and impressed in one or more consecutive AC voltage half-waves of the same polarity
Implementation Method 2
the AC voltage half-wave not used for the transmission of the control commands from the extension to the main office - the feedback half-wave - is used to transmit data from the main office to the extension
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
A method for operating an electrical installation system 1 is described. This installation system comprises at least one auxiliary station NS, which is wired to a main station HS intended for controlling at least one actuator A. The main station HS can be controlled via the auxiliary station NS. To control the main station HS by the auxiliary station NS, control commands are imprinted onto an electrical line 2 connecting the auxiliary station NS to the main station HS in a voltage-encoded manner as one or more successive identical alternating voltage half-waves – command half-waves. The other alternating voltage half-wave, not used for transmitting the control commands from the auxiliary station NS to the main station HS – the feedback half-wave – is used to transmit data from the main station HS to the auxiliary station NS by imprinting the information to be transmitted to the auxiliary station NS in a voltage-encoded manner into the feedback half-wave.