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:
May. 07, 2002
Filed:
Feb. 12, 2001
Joel Turchi, Toulouse, FR;
Frantisek Sukup, Roznov Pod Radhostem, CZ;
Semiconductor Components Industries LLC, Pheonix, AZ (US);
Abstract
A method and a power conversion apparatus having a substantially direct current input voltage, an output transformer having a primary inductor and at least a secondary winding, and a transistor for controlling the transfer of energy from the primary inductor to the secondary winding and coupled to a controller for switching the transistor on and off at a predetermined rate. A sensor for sensing the power required at the output of the conversion apparatus and for generating a voltage representative thereof is provided, as is provided a sensor for sensing the peak current in the primary inductor and for developing a voltage representative thereof. The controller contains a circuit for inhibiting selected on-cycles of the transistor when the power demand from the output of the conversion apparatus is less than the desired peak current in the primary inductor, the circuit comprising a comparator, a current source for developing a biasing voltage representative of the desired peak current in the primary inductor across a resistor external to the controller during the time when the transistor is switched off, means for receiving the voltage representative of the power required, comparing the biasing voltage to the voltage representative of the power required at the output, and having the output of the comparator coupled to the gate of the transistor for causing the transistor to skip on-cycles when the power demand from the output is below that power the biasing voltage is representative of.