Powerline Power Supply Unit With Zero-Cross Modulation
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Solution Overview
Problem
HPAV network STBs require three types of electrical input: DC voltage, very low frequency AC voltage for zero crossing detection, and high frequency AC for data signal transmission, posing challenges in configuring external power units to meet these requirements while minimizing heat buildup and size, and ensuring compliance with power supply regulations.
Innovation Solution
A power unit with an AC/DC converter, zero cross unit for modulating output, and high pass filters to pass powerline data signals, connected in parallel to the AC/DC converter, along with a triple wire interface for efficient data transmission and error recovery in noisy environments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If external power unit is used to reduce heat buildup and size in STB, then heat management and device compactness are improved, but the power unit must handle multiple signal types (DC voltage, low frequency AC for zero crossing detection, and high frequency AC for data transmission) which increases configuration complexity
Solution Approach 1:
The power unit is segmented into distinct functional modules: an AC/DC converter for power conversion, a zero-crossing detection unit for low frequency AC signal processing, and a high pass filter for high frequency data signal transmission. Each module handles a specific signal type independently, reducing configuration complexity while maintaining compact external housing.
Solution Approach 2:
The external power unit is designed as a multi-functional device that simultaneously provides DC voltage output, zero-crossing detection capability, and high-frequency data transmission. This universal design consolidates multiple functions into a single external unit, reducing overall system complexity despite the multiple signal types handled.
2Adaptability or versatility
If external power unit is used to enable separate configuration and certification, then compliance flexibility is improved, but the unit must process multiple frequency ranges which increases design complexity
Solution Approach 1:
The power unit is segmented into distinct functional modules: an AC/DC converter for power conversion, a zero-crossing detection unit for low frequency AC signal processing, and a high pass filter for high frequency data signal transmission. Each module handles a specific signal type independently, reducing configuration complexity while maintaining compact external housing.
Solution Approach 2:
The power unit is designed with adjustable parameters including filter cutoff frequencies and voltage conversion ratios. By changing these parameters, the same hardware design can be certified for different power supply requirements and regulations, improving compliance flexibility without increasing design complexity.
3Adaptability or versatility
If high pass filter is added in parallel to AC/DC converter to pass powerline data signals, then data transmission capability is improved, but the circuit complexity increases
Solution Approach 1:
The high pass filter is merged with the AC/DC converter circuit, with both components sharing common input and output connections. This combining approach allows the filter to be integrated into the existing power conversion pathway without adding separate signal paths, thereby improving data transmission capability while minimizing circuit complexity.
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
The solution enables efficient powerline communication by providing modulated DC voltage and passing high frequency data signals, reducing interference and heat buildup, while allowing for separate configuration and compliance with power supply regulations, thus enhancing the performance and reliability of HPAV network STBs.
Implementation Method 1
a plug-in adapter (or AC adapter) used to convert the alternating current (AC) electricity received from the mains to the direct current (DC) electricity used to power the adapters
Implementation Method 2
at least one high pass filter (HPF) to filter said VAC input and to pass powerline data signals received on a same medium
Implementation Method 3
a zero cross unit for generating a zero-crossing signal which is input to said AC/DC converter to modulate output from said AC/DC converter according to zero crossings in said VAC input
Implementation Method 4
an output signal from the power unit to the powerline communication device is a combination of said modulated output from said AC/DC converter and said powerline data signals passed through said HPF
Data Source
Figure 1
Figure 2A
Figure 2B
AI summary
A power unit includes an AC/DC converter for converting VAC input to DC, a zero cross unit for modulating the AC/DC converter output to facilitate zero crossing detection based on the output, and a high pass filter (HPF) for filtering data signals, where the data signals are transmitted and received on the same medium from which the VAC input is received. A method for providing power and data signals from a single poweriine source, including receiving incoming VAC in an external power unit, converting the incoming VAC to DC, modulating the DC in accordance with zero crossings from the incoming VAC, filtering the VAC to isolate high frequency data signals, where the data signals are transmitted and received on a same medium from which the incoming VAC is received, and providing the DC, modulated DC, and data signals to a processing unit.