Single Pair Cable Power and Data Transmission IC
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Solution Overview
Problem
The existing RS485/RS422 data communication systems require two pairs of cables for power delivery, leading to increased costs and weight, as they do not efficiently integrate power and data transmission over the same physical medium.
Innovation Solution
An integrated circuit (IC) that uses an oscillator, on-off-keying modulator, serial communications transmitter, receiver, and envelope detector to simultaneously transmit power and data over a single pair of cables, employing AC coupling capacitors and inductors to modulate data over the power cabling, conforming to RS485 standards and reducing EMI through SSC operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If two pairs of cables are used for power delivery and data communication in RS485/RS422 systems, then reliable power and data transmission is achieved, but cabling cost and system weight increase
Solution Approach 1:
The patent combines power delivery and data communication into a single cable pair by superimposing data signals on top of power carrier waves. The transmitter modulates data onto power frequency carrier waves (50/60Hz or higher), allowing both power and data to coexist on the same physical medium without requiring separate cabling infrastructure.
Solution Approach 2:
The cable pair is designed to serve multiple functions simultaneously: it acts as both a power delivery medium and a data communication channel. The system enables the same physical infrastructure to carry both high-power electrical energy and modulated data signals, eliminating the need for dedicated separate cabling for each function.
2Reliability
If two pairs of cables are used for power delivery and data communication, then separate power and data channels are maintained, but cabling cost increases
Solution Approach 1:
The patent merges power delivery and data communication into a single cable pair by superimposing data signals on top of power carrier waves. The transmitter modulates data onto power frequency carrier waves (50/60Hz or higher), allowing both power and data to coexist on the same physical medium without requiring separate cabling infrastructure.
Solution Approach 2:
The cable pair is designed to serve multiple functions simultaneously: it acts as both a power delivery medium and a data communication channel. The system enables the same physical infrastructure to carry both high-power electrical energy and modulated data signals, eliminating the need for dedicated separate cabling for each function.
3Ease of manufacture
If data is transmitted over power cabling using modulation, then a single cable pair is used, but EMI may increase
Solution Approach 1:
The system uses periodic carrier waves at power frequencies (50/60Hz or higher) as the base for data modulation. By establishing a stable periodic carrier signal and modulating data onto it, the system creates predictable electromagnetic patterns that are easier to manage and shield compared to random or high-frequency digital signals, thereby reducing EMI issues.
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
This solution reduces cabling costs and weight by enabling simultaneous power and data transmission over a single pair of cables, maintaining compliance with RS485 standards and allowing for real-time deterministic operations without requiring controller or software updates.
Implementation Method 1
an on-off-keying modulator configured to modulate input data coupled to the oscillator
Implementation Method 2
an envelope detector coupled to the serial communications receiver
Data Source
AI summary
Systems and methods are disclosed for an integrated circuit (IC) comprising an oscillator, an on-off-keying modulator configured to modulate input data coupled to the oscillator, a serial communications transmitter coupled to the on-off-keying modulator, a serial communications receiver coupled to the serial communications transmitter by a set of cables, and an envelope detector coupled to the serial communications receiver. In the IC, power and data are simultaneously delivered across the same set of cables from the serial communications transmitter to the serial communications receiver.