Magnetic Stimulation LC Circuit With Reverse-Polarity Switching
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Solution Overview
Problem
Existing magnetic stimulation circuits suffer from energy dissipation losses due to resistors, prolonged charging times, and inefficiencies in multichannel operations, leading to reduced magnetic pulse repetition rates and increased electromagnetic emissions.
Innovation Solution
A circuit design that includes a capacitor bank and a switch to disconnect the LC circuit from the power supply during reverse polarity, eliminating the need for resistors and minimizing losses, while allowing for efficient multichannel operation and reduced electromagnetic emissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If resistors are used in the LC circuit to limit current and protect against reverse polarity, then the circuit reliability is improved, but energy dissipation losses increase and magnetic pulse repetition rate decreases
Solution Approach 1:
The patent removes resistors from the LC circuit entirely, extracting the harmful energy-dissipating component while implementing an alternative protection mechanism using a switch that disconnects the power supply during reverse polarity conditions. This eliminates continuous energy loss through resistive heating while maintaining circuit reliability.
Solution Approach 2:
The patent introduces a switch as an intermediary component between the power supply and the LC circuit. This switch acts as a mediator that protects against reverse polarity without dissipating energy as heat, unlike resistors. The switch enables or disables current flow based on polarity detection, providing protection while maintaining energy efficiency.
2Reliability
If resistors are used to protect against reverse polarity, then the circuit reliability is improved, but the magnetic pulse repetition rate is reduced due to prolonged charging times
Solution Approach 1:
By removing resistors from the circuit, the patent eliminates the time constant limitation imposed by resistive charging. The RC time constant that governs charging speed is eliminated, allowing faster capacitor charging and thus higher magnetic pulse repetition rates while maintaining reliability through the switch-based protection mechanism.
Solution Approach 2:
The switch serves as an intermediary that enables rapid response to polarity changes without the delays inherent in resistive circuits. By controlling current flow on-demand, the switch allows the capacitor to charge and discharge more rapidly, increasing the pulse repetition rate while still providing necessary protection.
3Adaptability or versatility
If multichannel operations are implemented, then the treatment coverage area is increased, but electromagnetic emissions and energy consumption increase
Solution Approach 1:
The patent divides the treatment system into multiple independent channels, each with its own capacitor and coil but sharing the power supply through the protective switch. This segmentation allows selective activation of channels, enabling treatment of larger body areas while controlling electromagnetic emissions by operating only the necessary channels at any given time.
Solution Approach 2:
The switch acts as a central intermediary that controls power distribution to multiple channels. By managing power flow to individual channels based on treatment requirements, the system can expand coverage area through multichannel operation while minimizing unnecessary electromagnetic emissions from inactive channels.
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 circuit achieves high magnetic pulse rates with reduced power consumption, minimized electromagnetic interference, and improved reliability, enabling effective magnetic stimulation therapies, particularly for large body areas.
Implementation Method 1
The physical principle of magnetic stimulation is based on a time-varying current flow passing through an electromagnetic coil, resulting in an equally time-varying (e.g., pulsed) magnetic field around the coil
Implementation Method 2
When a pulse of the magnetic field passes into the body, the pulse will induce a voltage difference between spatially separated points in and/or on the body. This voltage difference yields an electric field and thus induces electrons to flow between the spatially separated points
Data Source
AI summary
A circuit for generating a time-varying magnetic field for magnetic stimulation includes a capacitor bank comprising at least one capacitor, and a first electromagnetic coil. The capacitor bank and the first electromagnetic coil form a first LC circuit. The circuit further comprises a power supply for charging the capacitor bank by applying a charging voltage to the capacitor bank. In addition, the circuit comprises a switch configured to electrically disconnect the first LC circuit from the power supply when a voltage across the capacitor bank is reverse in polarity to the charging voltage.