Integrated Inductors That Achieve Low Near-Magnetic Field Emission

Technology #16905

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Researchers
Huan Zhang
Shuo Wang
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Richard Croley
Assistant Director 352-392-8929
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US Patent Pending

Decreases the Interference Due to Magnetic Leakage in Electronic Circuits

These integrated inductor coils produce low overall magnetic field emissions, reducing the effects of electromagnetic interference in electronics. Power circuit designers consistently face the challenges of reducing electromagnetic interference and other sources of electronic noise. Electromagnetic interference caused by near-magnetic field coupling can potentially hinder the transfer of electrical energy, weaken the performance of electrical components, and generate unwanted current in sections of a circuit. Available methods to counteract electromagnetic interference include arranging passive filters formed by inductors and capacitors so that a reduced electromagnetic interference noise flows through the system. However, the performance of such practices is limited by unintended near-magnetic field couplings between the inductors and nearby circuits, counteracting the initial aim of the inductors.

Researchers at the University of Florida have developed an integrated inductor design that generates a weaker near-magnetic field while providing both the common mode and differential mode inductances, reducing electromagnetic interference and maintaining optimal conditions for proper circuit performance.

Application

Integrated inductor coils that limit the magnetic noise in power converters for electronic devices such as cell phones, tablets or laptops

Advantages

  • Lowers magnetic field emissions compared to conventional inductor designs, preventing damage to electromagnetic interference filters and other electronic components
  • Limits the extent of common and differential magnetic noise, decreasing the probability of circuit failure
  • Applies to a wide range of analog and digital systems, introducing an efficient tool for high-performance circuit design
  • Maintains necessary inductance in small volume for power converters, ensuring optimal transfer of energy between populated areas

Technology

Inductance is the instance when an electrical conductor induces a potential difference with itself and nearby components. In an effort to reduce electromagnetic interference caused by near-magnetic field coupling, electrical engineers use shielding metals to limit the magnetic field within the circuit. This configuration of integrated inductors generate small leakage magnetic field without using any shielding materials. The configuration consists of a series of inductor coils wrapped around suture legs that results in a dampened near-magnetic field. By limiting the extent of magnetic noise among smaller distances, these integrated inductors allow developers to construct smaller and stronger electronic circuits for more powerful and compact devices.