DC-TO-400HZ INVERTER

Award Information
Agency: National Aeronautics and Space Administration
Branch: N/A
Contract: N/A
Agency Tracking Number: 6753
Amount: $49,997.00
Phase: Phase I
Program: SBIR
Awards Year: 1988
Solicitation Year: N/A
Solicitation Topic Code: N/A
Solicitation Number: N/A
Small Business Information
150 Strong Rd Po Box 637, S Windsor, CT, 06074
DUNS: N/A
HUBZone Owned: N
Woman Owned: N
Socially and Economically Disadvantaged: N
Principal Investigator
 DR HERBERT R WEISCHEDEL
 () -
Business Contact
Phone: () -
Research Institution
N/A
Abstract
NDT TECHNOLOGIES, INC. HAS RECENTLY DEMONSTRATED THE FEASIBILITY OF A SIMPLE, LIGHTWEIGHT, HIGH-EFFICIENCY POWER CONDITIONING MODULE. THE MODULE IS VERY VERSATILE AND CAN BE USED AS A BUILDING BLOCK FOR A WIDE VARIETY OF APPLICATIONS SUCH AS: FOUR-QUADRANT BI-DIRECTIONAL DC-AC INVERSION, LINE VOLTAGE REGULATION, UNINTERRUPTIBLE POWER SUPPLIES, ACTIVE POWER FILTERING, DC ISOLATION, POWER FACTORCOMPENSATION, AND FOUR-QUADRANT BI-DIRECTIONAL VOLTAGE/FREQUENCY CONVERSION. FURTHERMORE, IN MANY CASES, USE OF THE MODULE CAN ELIMINATE HEAVY AND EXPENSIVE LOW-FREQUENCY TRANSFORMERS AND OTHER INDUCTIVE SYSTEM COMPONENTS. IN PARTICULAR, THIS NEW MODULE APPEARS WELL-SUITED AS A DC-TO-400HZ INVERTER. THE PRESENT PROTOTYPE USES CLAMP-DIODE SWITCHING, WHICH, DUE TO THE REVERSE REDOVERY CHARACTERISTICS OF DIODES, CAUSES CERTAIN PROBLEMS. THESE PROBLEMS INCLUDE EMI/RFI, HIGH SWITCHING STRESSES AND UNNECESSARILY HIGH SWITCHING LOSSES. TO REMEDY THESE SHORTCOMINGS, IT IS PROPOSED TO REPLACE THE PRESENT CLAMP-DIODE SWITCHING APPROACH WITH A QUASI-RESONAMT SWITCHING SCHEME. QUASI-RESONANT SWITCHING ALLOWS SWITCHING FREQUENCIES UP TO THE MEGA-HERTZ RANGE. ITOFFERS MANY ADVANTAGES, SUCH AS: LOW EMI/RFI, LOW SWITCHING STRESSES AND SWITCHING LOSSES, EXTREMELY HIGH POWER DENSITIES AND, THEREFORE, EXTREMELY LIGHTWEIGHT AND COMPACT POWER CONDITIONING MODULES.

* Information listed above is at the time of submission. *

Agency Micro-sites

SBA logo
Department of Agriculture logo
Department of Commerce logo
Department of Defense logo
Department of Education logo
Department of Energy logo
Department of Health and Human Services logo
Department of Homeland Security logo
Department of Transportation logo
Environmental Protection Agency logo
National Aeronautics and Space Administration logo
National Science Foundation logo
US Flag An Official Website of the United States Government