The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 30, 1990
Filed:
Jun. 20, 1989
Warren J Schultz, Tempe, AZ (US);
Motorola Inc., Schaumburg, IL (US);
Abstract
A transformer coupled amplifier drive circuit (60) and method especially suited for providing a saw-tooth current waveform to an inductive load (32) for horizontal deflection applications in CRT monitors and the like are described. The transformer primary (48) is coupled between the power source connection (11) and the input of the amplifier (26) while the transformer secondary (50) has an opposite polarity terminal coupled to the input of the amplifier (26) through an inductor (52) and the other terminal of the secondary (50) coupled to the common terminal (15) of the amplifier (26) through a diode (56). When the input switch (44) is closed, the input of the amplifier (26) is energized by a current (65) through the series connected primary (48) and energy is stored in the transformer magnetizing field and in the amplifier (26). Conduction in the transformer secondary (50) is blocked by the diode (56). When the input switch (44) is opened, the input charging current (65) stops and the collapsing primary magnetizing field produces an oppositely directed current (67) which flows through the secondary winding (50), the diode (56), the series connected inductor (52) and the input to the amplifier (26). The demagnetization energy stored in the transformer (48) cancels the energy stored in the amplifier (26), thereby reducing total dissipation, and the inductor (52) controls the fall time independent of the rise time.