Avionic Power and Data Line Segregation via Frequency Filtering
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Solution Overview
Problem
Avionic systems require a simultaneous bidirectional communication channel with high data rates and electrical power transmission over a single electrical power line, while adhering to stringent EMC and lightning insulation constraints, which existing technologies like on-line carrier currents fail to meet due to radiation pollution and compatibility issues.
Innovation Solution
A device comprising a central controller and remote peripheral linked by a bifilar electrical power line with low-pass and high-pass filters, differential amplifiers, and baseband data transmission, allowing for the segregation of power supply and communication signals, enabling efficient power transmission and bidirectional data exchange without radiation pollution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If on-line carrier currents (CPL) technology is used to mutualize power and data transmission, then a single bifilar line can transmit both power and bidirectional data, but it causes excessive radiation pollution and is incompatible with EMC constraints
Solution Approach 1:
The patent segments the signal spectrum by using a low-pass filter for power transmission (low frequencies) and a high-pass filter for data transmission (high frequencies). This frequency division allows both power and data to coexist on the same bifilar line without interfering with each other, eliminating the radiation pollution problem of CPL technology while maintaining the versatility of single-line transmission.
Solution Approach 2:
The patent changes the frequency parameter of signal transmission. Instead of using carrier currents at high frequencies (which cause radiation), the invention transmits data in baseband at high frequencies above the power transmission band but without modulating onto a carrier. This parameter change eliminates radiation pollution while maintaining EMC compatibility.
2Device complexity
If a single bifilar line is used for both power and data transmission, then cable complexity is reduced, but EMC and lightning insulation constraints become difficult to meet
Solution Approach 1:
The patent applies segmentation by dividing the frequency spectrum into distinct bands for power and data transmission using low-pass and high-pass filters. This allows the same physical cable to carry both signals reliably without EMC interference, maintaining cable simplicity while meeting reliability constraints.
Solution Approach 2:
The patent introduces filters as intermediary components between the power transmitter and the data communication channel. These filters act as mediators that separate the power and data signals in the frequency domain, enabling reliable transmission on a single cable while satisfying EMC and lightning insulation requirements.
3Productivity
If high frequency carrier modulation is used for data transmission, then data transmission rate is improved, but radiation pollution increases and becomes incompatible with avionic EMC constraints
Solution Approach 1:
The patent inverts the conventional approach by transmitting data in baseband at high frequencies without carrier modulation. Instead of modulating data onto a carrier frequency (which causes radiation), the invention directly transmits the baseband signal in the high-frequency band above the power transmission band, achieving high data rates without radiation pollution.
Solution Approach 2:
The patent changes the transmission mode parameter from carrier-modulated high-frequency transmission to baseband high-frequency transmission. This parameter change maintains high data transmission rates while eliminating the radiation pollution associated with carrier modulation, making it compatible with avionic EMC constraints.
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 allows for the simultaneous transmission of power and bidirectional data over a single electrical line, ensuring EMC and lightning compatibility, reducing noise levels, and supporting various avionic standards, thus addressing the constraints of the aeroplane environment.
Implementation Method 1
a low-pass filter arranged between the power transmitter and the electrical line
Implementation Method 2
a high-pass filter arranged between the data transmission/reception means and the electrical line
Implementation Method 3
the data transmission/reception means comprise a differential amplifier able to discriminate, among the data transiting on the electrical line, the data transmitted locally from the data to be received
Data Source
AI summary
According to a first aspect the invention relates to a device forming a central controller (C) intended to be linked to a remote peripheral (P1-PN) by way an electrical power line (L), comprising a power transmitter (1) and a low-pass litter (CC<sub2>—</sub2>BF) arranged between the power transmitter and the electrical line, as well as means for transmitting/receiving data (3) in baseband and a high-pass filter (CC<sub2>—</sub2>HF) arranged between the data transmission/reception means and the electrical line, the electrical line being of the kind mutualized for the transmission of power at low frequency from the central controller to the remote peripheral and for the simultaneous bidirectional transmission of data in baseband at high frequency between the central controller and the remote peripheral. The invention also relates to a remote peripheral (P1-PN) as well as to the system comprising a central control linked to one or more remote peripherals by an electrical line mutualized for the transmission of power and of bidirectional data simultaneously.