Triangular Magnetic Waveform Generator Circuit
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Solution Overview
Problem
Existing communication methods for underwater and through land environments, such as RF, optical, acoustic, and near-field magnetic communications, face limitations in energy efficiency and bit rate due to the propagation characteristics of signals, with traditional magnetic field generators producing sinusoidal waveforms that are not efficiently controllable.
Innovation Solution
A magnetic waveform generator circuit using a switching scheme with inductors and capacitors to create a variable magnetic field with a triangular waveform, allowing for controlled ramp rate and amplitude modulation, thereby achieving higher bit rates and energy efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If traditional sinusoidal magnetic field waveforms are used with LC circuit resonance, then energy efficiency is improved, but the ability to control waveform shape and achieve high bit-rate communications is limited
Solution Approach 1:
The patent segments the magnetic field generation into multiple independent voltage sources (first voltage source, second voltage source, third voltage source) that can be independently controlled. Each voltage source connects to the coil through switching elements, allowing independent control of different segments of the waveform generation process. This enables flexible waveform shaping while maintaining energy efficiency through selective activation of only the necessary voltage sources for each waveform segment.
Solution Approach 2:
The patent implements dynamic control of the magnetic field waveform by using switching elements (transistors or thyristors) that can rapidly change the connection state between voltage sources and the coil. The control circuit dynamically adjusts which voltage sources are connected and for how long, enabling real-time waveform shape modification, amplitude modulation, and frequency control without requiring a complete redesign of the LC resonant circuit.
2Length of stationary object
If near-field magnetic communications with low-frequency signals are used, then measurable range is improved, but bit rate is limited due to rapid signal strength drop-off
Solution Approach 1:
The patent employs periodic switching of multiple voltage sources to generate a continuous train of magnetic field pulses with variable waveforms. By rapidly switching between different voltage sources and controlling the duty cycle of each pulse, the system maintains measurable signal strength over extended ranges while encoding information at high rates through variations in pulse amplitude, width, and frequency, thereby achieving both long range and high bit rate simultaneously.
Solution Approach 2:
The patent changes multiple parameters of the magnetic field signal simultaneously - amplitude, pulse width, frequency, and waveform shape - to optimize both transmission range and bit rate. The control circuit independently adjusts these parameters for each transmitted pulse, allowing the system to adapt to different communication requirements and maintain high data rates even at extended ranges where signal strength naturally attenuates.
3Reliability
If acoustic communications are used, then robust communication is achieved, but bit rate is very low due to multipath and shallow-water resonances
Solution Approach 1:
The patent replaces acoustic communication (mechanical wave propagation through water) with electromagnetic induction-based magnetic field communication. This substitution eliminates the fundamental limitations of acoustic waves in underwater environments, such as multipath propagation and shallow-water resonances, while maintaining robust communication through the direct coupling between the transmitter coil and receiver coil via magnetic flux.
Solution Approach 2:
The patent creates a multi-functional communication system that can operate in various underwater and terrestrial environments using a single magnetic field-based platform. The system can adapt its waveform characteristics to suit different application requirements, providing both robust communication in challenging environments and high bit rate performance, thereby replacing the need for environment-specific communication systems.
4Productivity
If RF and optical electromagnetic signals are used, then high bit rate communication is achieved, but propagation under ocean surface or through land is poor
Solution Approach 1:
The patent replaces high-frequency electromagnetic radiation (RF and optical signals that suffer from poor propagation in certain media) with low-frequency magnetic field induction. This substitution uses electromagnetic induction principles rather than radiation, creating a non-radiating near-field system that couples magnetically between transmitter and receiver, thereby achieving reliable propagation through land, water, and other media that block or attenuate traditional RF and optical signals.
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 higher bit rates and signal-to-noise ratios with lower energy consumption, providing a more efficient and stealthy communication method by modulating each cycle of the waveform, which is essential for underwater and land communication systems.
Implementation Method 1
The first switch and the first rectifier element are configured to enable the inductor to generate, during the first and the second time periods, a magnetic field having a waveform resembling a positive half-cycle of a triangular waveform
Data Source
AI summary
A magnetic waveform generator circuit includes a first switch coupled to a first rectifier element at a first node, a first capacitor coupled, at a second node to the first switch, and to a fourth node, a second capacitor coupled, at a third node to the first rectifier element, and to the fourth node, and an inductor coupled between the first and the fourth nodes. The first switch is operable to be in an ON state during a first time period and in an off state during a second time period. The first switch and the first rectifier element are configured to enable the inductor to generate, during the first and the second time periods, a magnetic field having a waveform resembling a positive half-cycle of a triangular waveform.