Transistorized power switch and base drive circuit therefore

PDF Version Also Available for Download.

Description

A high power switching circuit is disclosed which utilizes a four-terminal Darlington transistor block to improve switching speed, particularly in rapid turn-off. Two independent reverse drive currents are utilized during turn-off in order to expel the minority carriers of the Darlington pair at their own charge sweep-out rate. The reverse drive current may be provided by a current transformer, the secondary of which is tapped to the base terminal of the power stage of the Darlington block. In one application, the switching circuit is used in each power switching element in a chopper-inverter drive of an electric vehicle propulsion system.

Physical Description

Pages: 21

Creation Information

Lee, F.C. & Carter, R.A. March 24, 1981.

Context

This patent is part of the collection entitled: Office of Scientific & Technical Information Technical Reports and was provided by UNT Libraries Government Documents Department to Digital Library, a digital repository hosted by the UNT Libraries. More information about this patent can be viewed below.

Who

People and organizations associated with either the creation of this patent or its content.

Assignee

Publisher

Provided By

UNT Libraries Government Documents Department

Serving as both a federal and a state depository library, the UNT Libraries Government Documents Department maintains millions of items in a variety of formats. The department is a member of the FDLP Content Partnerships Program and an Affiliated Archive of the National Archives.

Contact Us

What

Descriptive information to help identify this patent. Follow the links below to find similar items on the Digital Library.

Description

A high power switching circuit is disclosed which utilizes a four-terminal Darlington transistor block to improve switching speed, particularly in rapid turn-off. Two independent reverse drive currents are utilized during turn-off in order to expel the minority carriers of the Darlington pair at their own charge sweep-out rate. The reverse drive current may be provided by a current transformer, the secondary of which is tapped to the base terminal of the power stage of the Darlington block. In one application, the switching circuit is used in each power switching element in a chopper-inverter drive of an electric vehicle propulsion system.

Physical Description

Pages: 21

Notes

NTIS, PC A02/MF A01.

Source

  • Other Information: NASA case LEW-13,501-1

Language

Item Type

Identifier

Unique identifying numbers for this patent in the Digital Library or other systems.

  • Other: DE82007297
  • Office of Scientific & Technical Information Report Number: 5555126
  • Archival Resource Key: ark:/67531/metadc1088409

Collections

This patent is part of the following collection of related materials.

Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

Office of Scientific and Technical Information (OSTI) is the Department of Energy (DOE) office that collects, preserves, and disseminates DOE-sponsored research and development (R&D) results that are the outcomes of R&D projects or other funded activities at DOE labs and facilities nationwide and grantees at universities and other institutions.

What responsibilities do I have when using this patent?

When

Dates and time periods associated with this patent.

Creation Date

  • March 24, 1981

Added to The UNT Digital Library

  • Feb. 10, 2018, 10:06 p.m.

Description Last Updated

  • June 4, 2019, 6:25 p.m.

Usage Statistics

When was this patent last used?

Yesterday: 0
Past 30 days: 0
Total Uses: 5

Interact With This Patent

Here are some suggestions for what to do next.

Start Viewing

PDF Version Also Available for Download.

International Image Interoperability Framework

IIF Logo

We support the IIIF Presentation API

Lee, F.C. & Carter, R.A. Transistorized power switch and base drive circuit therefore, patent, March 24, 1981; [Washington D.C.]. (https://digital.library.unt.edu/ark:/67531/metadc1088409/: accessed September 18, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.