High-Permeability Split-Core Transformer for Low Current Energy Harvesting
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Solution Overview
Problem
Conventional energy harvesting devices for power grids, which utilize iron transformer cores with low magnetic permeability, require high electrical currents to generate sufficient power, making them impractical and susceptible to failure, as they struggle to harness power from power lines carrying low AC currents, such as 1 amp, and are not commercially viable for powering sensors.
Innovation Solution
A high-inductance split-core power transformer with a primary winding formed by a power line, using a core material with high relative magnetic permeability, such as sintered MnZnFe2O3 or nickel alloy, and incorporating secondary windings and DC core-flux control windings to efficiently harvest energy from low AC currents, allowing for the operation of power grid sensors and other devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If iron transformer core is used in energy harvesting device, then the device structure is simple and easy to manufacture, but the magnetic permeability is low and inductance is low requiring high electrical currents (10-40 amps) to generate sufficient power
Solution Approach 1:
The patent changes the material parameter of the transformer core from conventional iron to high-permeability materials (nanocrystalline alloy with permeability 100,000-1,000,000 or amorphous alloy with permeability 50,000-200,000). This parameter change enables the core to concentrate magnetic flux more effectively, allowing the energy harvesting device to generate sufficient power from low electrical currents (1 amp) rather than requiring high currents (10-40 amps), thus resolving the contradiction between ease of manufacture and power generation capability
Solution Approach 2:
The patent employs composite material structures including nanocrystalline alloys composed of multiple elements (Fe, Ni, Si, B, etc.) in specific proportions. These composite materials provide both high magnetic permeability and mechanical stability, enabling effective energy harvesting from low-current power lines while maintaining manufacturability through standardized core designs
2Ease of manufacture
If iron transformer core is used in energy harvesting device, then the manufacturing process is straightforward, but the core is susceptible to oxidation preventing close contact of core mating surfaces causing failure
Solution Approach 1:
The patent employs protective coatings (varnish, epoxy, or polymer coatings) on the high-permeability core materials to prevent oxidation. These coatings create a protective barrier that prevents direct contact between the core mating surfaces and oxidizing environments, thereby preventing contact resistance and device failure while maintaining the manufacturing simplicity of the core structure
Solution Approach 2:
The patent uses composite material structures combining high-permeability alloy cores with protective coating layers. The core materials (nanocrystalline or amorphous alloys) are inherently more resistant to oxidation than conventional iron, and when combined with protective coatings, they provide both high magnetic performance and long-term reliability in electrical harvesting applications
3Device complexity
If conventional energy harvesting device is designed, then the structure is simple, but it cannot harvest sufficient power from power lines carrying low AC currents (1 amp)
Solution Approach 1:
The patent fundamentally changes the magnetic permeability parameter of the transformer core from conventional values (10,000-20,000 for iron) to extremely high values (100,000-1,000,000 for nanocrystalline alloys or 50,000-200,000 for amorphous alloys). This parameter enhancement allows the device to efficiently concentrate and harvest magnetic energy from low-current power lines (1 amp) without requiring complex device architecture, thus resolving the contradiction between device simplicity and power harvesting capability
Solution Approach 2:
The patent introduces a new dimension of material performance by utilizing nanocrystalline and amorphous alloy structures that provide unprecedented magnetic permeability values. This material dimension advancement enables effective energy harvesting from low-current applications without increasing device complexity, as the enhanced material properties alone provide sufficient magnetic flux concentration
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 efficient energy harvesting from power lines carrying low AC currents, providing reliable power to sensors and other devices, reducing the need for batteries or solar cells and enhancing the operational longevity by using materials with high magnetic permeability.
Implementation Method 1
using a core material with high relative magnetic permeability, such as sintered MnZnFe2O3 or nickel alloy
Implementation Method 2
a high-inductance split-core power transformer with a primary winding formed by a power line, using a core material with high relative magnetic permeability, such as sintered MnZnFe2O3 or nickel alloy, and incorporating secondary windings and DC core-flux control windings to efficiently harvest energy from low AC currents
Data Source
AI summary
A device for harvesting energy from a power line carrying AC current including: a transformer having a core with separate first and second sections, the core being formed of ceramic material or layered nickel alloy tape; a first secondary winding wound around the first section of the core; a second secondary winding wound around the second section of the core; a first DC core-flux control winding wound around the first section of the core; and a second DC core-flux control winding wound around the second section of the core; wherein the core is configured to be in operative communication with a magnetic field radiated from the power line, such that an AC voltage is generated in the first and second secondary windings, and the maximum AC voltage produced by the first and second secondary windings is limited by the first and second DC core-flux control windings.