Multi-Signal Class D Amplifier for Rail Twisted-Pair Transmission
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Solution Overview
Problem
Existing rail signaling systems face challenges in efficiently transmitting and decoding digital secure train detection signals while simultaneously supporting legacy cab and TWC signals over a single twisted pair of wire, as traditional Class AB amplifiers are inefficient and physically large.
Innovation Solution
A configurable integrated circuit device, such as an FPGA, synthesizes and scales multiple signals to create a discrete time pulse width modulated signal, which controls a Class D high power switching stage for efficient transmission, allowing for simultaneous and independent transmission of multiple signal types over a single twisted pair.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple separate Class AB linear amplifiers are used to transmit multiple signals simultaneously, then signal transmission capability is improved, but device size and power consumption increase significantly
Solution Approach 1:
The patent combines multiple separate Class AB linear amplifiers into a single Class D switching amplifier. The multiple signals (train detection signal, cab signal, and TWC signal) that previously required separate amplifiers are now transmitted through one integrated Class D amplifier, reducing the overall device size and component count while maintaining the capability to transmit all signals simultaneously.
Solution Approach 2:
The Class D amplifier is designed to perform multiple functions by transmitting different signal types through a single device. It can simultaneously amplify the train detection signal, cab signal, and TWC signal, making the amplifier universal and multi-functional rather than requiring dedicated amplifiers for each signal type.
2Adaptability or versatility
If multiple separate Class AB linear amplifiers are used to transmit multiple signals simultaneously, then signal transmission capability is improved, but power efficiency deteriorates
Solution Approach 1:
The patent combines multiple separate Class AB linear amplifiers into a single Class D switching amplifier. The multiple signals (train detection signal, cab signal, and TWC signal) that previously required separate amplifiers are now transmitted through one integrated Class D amplifier, reducing the overall device size and component count while maintaining the capability to transmit all signals simultaneously.
Solution Approach 2:
The patent changes the operating parameters of the amplifier by transitioning from Class AB linear amplification to Class D switching amplification. This parameter change involves using pulse-width modulation (PWM) to control the switching devices, allowing the amplifier to achieve higher efficiency by operating in a switching mode rather than a linear mode, thereby reducing power loss while maintaining signal transmission capability.
3Power
If Class AB linear amplifiers are used, then signal amplification is achieved, but physical size becomes very large
Solution Approach 1:
The patent replaces the traditional Class AB linear amplifier architecture with a Class D switching amplifier architecture. This substitution involves using electronic switching devices (such as MOSFETs or IGBTs) controlled by PWM signals instead of linear amplifying components, which significantly reduces the physical size of the amplifier while maintaining the signal amplification function.
Data Source
AI summary
An electronic amplifier includes a configurable integrated circuit device structured to synthesize at least a first signal and a second signal, scale the first signal to create a scaled first signal and scale the second signal to create a scaled second signal, create a discrete time composite signal which comprises a summation of at least the scaled first signal and the scaled second signal, create a discrete time pulse width modulated signal based on the discrete time composite signal, and generate a number of control signals based on the discrete time pulse width modulated signal. The electronic amplifier also includes a power switching stage receiving the number of control signals from the configurable integrated circuit device, wherein the number of control signals are configured to control the power switching stage, and a low pass filter coupled to an output of the power switching stage.