DC-Isolated Bidirectional Channel for Single-Pair Signal Transmission
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Solution Overview
Problem
Existing methods for transmitting direct-current and alternating-current signals between transmit-and-receive systems require multiple channels, leading to high costs and spatial requirements, and do not allow simultaneous bidirectional signal transmission.
Innovation Solution
A bidirectional DC-isolated transmission channel using a single two-conductor channel with a direct-current transmitter and an electronic I/I or I/U converter, which converts signals and allows for simultaneous transmission of measurement and message signals by short-circuiting the direct-current transmitter for signal isolation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If two DC-isolated channels are used for transmitting measurement and message signals, then signal transmission reliability is improved, but cost and spatial requirements increase
Solution Approach 1:
The patent combines the transmission of measurement signals and message signals into a single two-conductor channel. The measurement signal transmitter and message signal transmitter share the same physical channel, with DC isolation provided by an isolating converter. This merging eliminates the need for separate channels while maintaining signal integrity and DC isolation requirements.
Solution Approach 2:
The single two-conductor channel is designed to serve multiple functions: transmitting both measurement signals (via current-to-voltage conversion) and message signals (via voltage modulation). The isolating converter and associated circuitry enable this universal channel to handle different signal types bidirectionally, replacing the need for dedicated separate channels.
2Device complexity
If a single two-conductor channel with voltage converter is used, then spatial requirements are reduced, but simultaneous bidirectional signal transmission is not possible
Solution Approach 1:
The system dynamically switches the configuration of the isolating converter between different operating modes. When transmitting measurement signals, the converter operates in one mode; when transmitting message signals, it switches to another mode. This dynamic reconfiguration enables the single channel to support bidirectional communication without signal interference.
Solution Approach 2:
The patent employs periodic switching of the isolating converter's operating state to enable bidirectional communication. The converter alternates between configurations suitable for measurement signal transmission and message signal transmission, allowing both signal types to share the same channel through time-multiplexed operation.
3Reliability
If transformer with short-circuited secondary winding is used, then DC isolation is achieved, but simultaneous transmission of current and voltage signals from opposite directions is not possible
Solution Approach 1:
The isolating converter dynamically changes its circuit configuration based on the transmission direction and signal type. For measurement signals, it operates with the secondary winding short-circuited for DC isolation. For message signals, it reconfigures to allow voltage signal transmission in the opposite direction, enabling versatile bidirectional communication while maintaining DC isolation when needed.
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 efficient, cost-effective, and simultaneous bidirectional transmission of direct-current and alternating-current signals between two electronic devices without the need for additional DC-isolated channels, suitable for applications in hazardous areas and feedback signals.
Implementation Method 1
a direct-current transmitter (4) including an isolating converter (3) with a primary circuit (45) and a secondary circuit (46), which is short-circuited for signal transmission with direct-current signals, wherein the direct-current transmitter (4) converts direct-current signals into alternating-current signals and back into direct-current signals
Data Source
AI summary
Arrangement and method for electrically isolated transmission of direct-current and alternating-current signals. The signals can be transmitted in both directions via the same and only DC-isolated channel. The arrangement comprises a first transmit-and-receive system (1), a direct-current transmitter (4) in short-circuit mode, an operational amplifier arrangement (5), and a second transmit-and-receive system (2) with a message signal transmitter (9).