Magnetic Cantilever Pulse Generator for Harsh-Environment Sensors
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Solution Overview
Problem
Existing energy harvesting technologies for wireless sensors in harsh environments are unreliable due to their reliance on uncontrollable environmental attributes and require complex semiconductor-based circuits, which have limited operational temperature and life.
Innovation Solution
A pulsed power generator system using a cantilever with a permanent magnet and an electromagnet to generate high-frequency electrical pulses through magnetic interaction, eliminating the need for complex electronic circuits and enabling operation within thick metallic enclosures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If traditional energy harvesting technologies are used to supply power to wireless sensors, then stable power can be provided for extended periods, but the systems rely on uncontrollable environmental attributes and have limited operational life
Solution Approach 1:
The patent replaces traditional semiconductor-based electronic circuits with a purely mechanical pulse generation system. A cantilever beam with a permanent magnet interacts with an electromagnet to generate mechanical oscillations, which drive a mechanical switch (reed switch) to produce electrical pulses. This mechanical substitution eliminates semiconductor components with limited thermal and operational lifetimes, thereby improving both reliability and operational duration in harsh environments.
2Temperature
If semiconductor-based circuits are used to convert electric power into electric pulses, then pulse generation can be achieved, but the operational temperature is limited to 200°C and operational life is reduced
Solution Approach 1:
The invention substitutes mechanical oscillation and magnetic field interaction for semiconductor-based power conversion circuits. The cantilever beam mechanism with permanent magnet and electromagnet generates mechanical vibrations that actuate a mechanical switch, eliminating the need for semiconductor devices. This allows operation at temperatures exceeding 200°C without degrading operational life, as the mechanical and magnetic components are inherently more temperature-resistant.
3Ease of operation
If complex electric circuits with multiple active and passive components are used for pulse generation, then pulse shaping can be achieved, but the device complexity increases
Solution Approach 1:
The patent extracts and eliminates complex electronic circuitry from the pulse generation system. Instead of using multiple active and passive components for pulse shaping, the invention employs a simplified mechanical oscillator (cantilever beam) combined with a single electromagnet and a mechanical switch. The pulse shaping function is achieved through the natural mechanical resonance of the cantilever and the timing of the mechanical switch closure, dramatically reducing device complexity while maintaining operational capability.
4Reliability
If traditional pulse generation methods using electric circuits are used, then constant power source is required, but obtaining constant power is difficult and unreliable in harsh environments
Solution Approach 1:
The invention implements a self-powered mechanism where the cantilever beam oscillates in response to environmental vibrations or thermal expansion, generating the mechanical energy needed to actuate the switch. The permanent magnet and electromagnet interaction provides the necessary force without requiring an external constant power source. This self-service capability ensures reliable operation in harsh environments where external power sources are difficult to obtain or maintain.
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 system provides reliable and long-term operation for sensor activation in harsh environments by generating controlled electrical pulses without the need for semiconductor components, ensuring stability across varying temperatures and within inaccessible regions.
Implementation Method 1
an electromagnet generating a time varying periodic magnetic flux, where the magnetic flux interacts with the permanent magnet to generate a direction-changing mechanical force that drives oscillation in the cantilever
Implementation Method 2
An oscillation of the cantilever can cause the cantilever tip to periodically contact the conducting pad forming an electrical switch suitable for pulse generation through the electric circuit
Data Source
AI summary
The embodiments disclose a pulsed power generator system that can include a cantilever comprising a cantilever tip disposed on a lower surface of a first end and a permanent magnet mounted on an upper surface of the first end, wherein the cantilever is connected to an electric circuit at a second end, an electromagnet generating a time varying periodic magnetic flux, wherein the magnetic flux interacts with the permanent magnet to generate a direction-changing mechanical force that drives oscillation in the cantilever, a conducting pad, disposed adjacent to the bottom surface of the first end of the cantilever and configured so that the cantilever tip can contact the conducting pad. An oscillation of the cantilever causes the cantilever tip to periodically contact the conducting pad forming an electrical switch suitable for pulse generation through the electric circuit.