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:
Apr. 19, 1994
Filed:
Apr. 28, 1992
David A Smith, Kowloon, HK;
Astec International, Ltd., , HK;
Abstract
A efficient circuit for driving two switching transistors of an electrical power transfer circuit in an anti-phase relationship is described. The drive circuit is applied to a power transfer circuit, such as a switching-type power converter, having a first switching transistor, a second switching transistor, and a magnetic storage element electrically coupled to the first switching transistor. The first switching transistor is coupled to the magnetic storage element and operates to vary the magnetic flux in the storage element. The present invention comprises a drive circuitry for operating the first switching transistor, the drive circuitry being responsive to a first control signal generated by the power transfer circuit. For driving the second switching transistor, the present invention comprises circuitry for generating a second control signal as a function of the magnetic flux in the magnetic storage element. The second control signal causes the second switching transistor to be conductive when the first switching transistor becomes non-conductive. The present invention further comprises a shunting circuitry responsive to the first control signal for causing the second switching transistor to be non-conductive when the first switching transistor becomes conductive. The circuitry for generating the second control signal and the shunting circuitry of the present invention may be constructed from components requiring less board area than standard drive circuitry for the second switching transistor.