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MEDRAD® Technical Publication No. 05-001 Power Supply Designed for Operation in Very High Strength Magnetic Fields

IP.com Disclosure Number: IPCOM000126262D
Publication Date: 2005-Jul-11
Document File: 3 page(s) / 129K

Publishing Venue

The IP.com Prior Art Database

Related People

L. Robert Crouthamel: INVENTOR [+3]

Abstract

A scalable point-of-load power supply design utilizing piezoelectric transformer coupling mechanism and air-core inductor components such that the design is immune to the effects of strong static magnetic fields, whereby the entire power supply is located within the strong magnetic field.

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Technical Publication No. 05-001

Power Supply Designed for Operation in Very
High Strength Magnetic Fields



L. Robert Crouthamel, Kevin M. Thuer, Dale Poth

A scalable point-of-load power supply design utilizing piezoelectric transformer coupling mechanism and air-core inductor components such that the design is immune to the effects of strong static magnetic fields, whereby the entire power supply is located within the strong magnetic field.

SPECIFICATION

The piezoelectric transformer may be driven open-loop or controlled by a closed-loop system, which adjusts the frequency and or amplitude of the excitation signal to regulate the output amplitude. Inductors required for creating the excitation (input) waveform, or used in the filtering or rectification of the output waveform utilize air-core designs to prevent saturation that would occur with conventional (iron core) inductors.

This type of power supply could be implemented in various topologies which currently use conventional transformers, including:

·         DC-AC (Step-Up) Inverter

·         Switch mode Isolated DC-DC converters (step up or down) of various topologies

Examples of Applications:

·         Backlight Inverter for LCD Display in or near the bore of MRI machine or other environment with a very strong magnetic field

·         Voltage regulation for circuitry in accessories or subsystems used in an MRI or other environments with a very strong magnetic field

·         Isolated Power Supply for Medical Devices used in the MRI Environment (e.g., patient interfaces, device interconnects, serial ports, display interfaces) or other environment with very strong magnetic fields

·         Isolated Power Supply for other applications in environments with very strong magnetic fields


Novel Features:

·         Efficiently provides isolated or non-isolated voltage regulation to loads in an environment with a strong static magnetic field

·         Power supply can be positioned at the point of load in magnetic environment -- can efficiently supply very high voltage loads without cabling losses, capacitive/inductive loading

·         Can efficiently provide a high degree of electrical isolation, unlike air core transformers in which efficiency drops with increased separation (isolation)

In prior art, one of the following approaches is used for power supplies in strong magnetic fields:

·         Linear Regulation which does not require transformers or inductors, and is therefore immune to magnetic fields, but is unable to provide any of the following: Isolation, step-up conversion, or DC-AC inversion

·         Switching Regulators using air-core inductors, but are unab...