Pulsed Electromagnetic Field Therapy Device Parallel Resonant Circuit
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Solution Overview
Problem
Existing pulsed electromagnetic field therapy devices operate at extremely high voltages, leading to high manufacturing costs, safety risks, and electromagnetic interference due to resistance losses and impedance mismatch issues, which limit their effectiveness and compliance with regulatory requirements.
Innovation Solution
A pulsed electromagnetic field therapy device with a parallel resonant circuit that omits a switch between the capacitor and inductor, using an external switch to control current ramping, reducing energy dissipation and allowing for longer decay times and lower operating voltages, thus minimizing interference and safety risks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a switch is used in the resonant circuit to control current, then the device can be operated selectively, but resistance losses in the switch cause energy dissipation and limit decay time
Solution Approach 1:
The patent divides the circuit control function into two separate parts: a switch connected in parallel with the resonant circuit for selective operation control, and the resonant circuit itself without an internal switch. This segmentation allows the switch to control power delivery without being part of the current path during oscillation, eliminating resistance losses while maintaining selective operation capability.
2Loss of energy
If high voltage is used to overcome resistance losses, then sufficient current can be maintained, but manufacturing costs increase and safety risks arise
Solution Approach 1:
The patent extracts the switch from the resonant circuit's current path and places it in parallel. This allows the resonant circuit to operate without the switch's resistance losses, enabling lower voltage operation. The switch remains available for selective control but does not impede the oscillating current, eliminating the need for expensive high-voltage components and improving safety.
3Ease of operation
If a switch is included in the resonant circuit, then operation can be controlled, but impedance mismatch causes radio-frequency interference
Solution Approach 1:
The patent segments the control function from the resonant circuit by placing the switch in parallel rather than in series. This allows the switch to control power delivery without being part of the oscillating current path, eliminating impedance mismatch issues. The resonant circuit maintains its natural impedance characteristics while the switch provides external control capability.
4Ease of operation
If the switch is part of the resonant circuit, then current can be controlled directly, but the circuit becomes more complex and expensive
Solution Approach 1:
The patent extracts the switch from the resonant circuit's internal structure and places it externally in parallel. This simplifies the resonant circuit to its essential components (capacitor and inductor) while maintaining current control capability through the external switch. The separation reduces component count, manufacturing complexity, and cost while preserving operational control.
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 a more sustained physiological effect with reduced manufacturing costs, improved safety, and compliance with electromagnetic interference regulations by eliminating resistance losses and impedance mismatch issues, allowing for lower voltage operations and longer decay times.
Implementation Method 1
the capacitor can be pre-charged before closing the switch to discharge the capacitor into the inductor to initiate oscillation of the resonant circuit. The resonant circuit then oscillates until losses dissipate the energy stored in the resonant circuit. As the resonant circuit oscillates, it generates a sequence of electromagnetic oscillations in the coil looped inductor
Implementation Method 2
a capacitor connected in parallel with an inductor without a switch between the capacitor and the inductor
Implementation Method 3
the parallel resonant circuit is configured to generate a pulsed electromagnetic field in the inductor while electrical energy is stored in the parallel resonant circuit
Data Source
AI summary
A pulsed electromagnetic field therapy device has a parallel resonant circuit comprising a capacitor connected in parallel with an inductor without a switch between the capacitor and the inductor in the parallel resonant circuit. The parallel resonant circuit is configured to generate a pulsed electromagnetic field in the inductor while electrical energy is stored in the parallel resonant circuit, and the inductor is configured to be placed relative to a part of a body to provide the pulsed electromagnetic field to the part of the body. The device also has a power source. A switch, external to the parallel resonant circuit, selectively connects the parallel resonant circuit to the power source for a current ramping period, and during the current ramping period a current in the inductor is increased to reach a desired current.