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:
Mar. 27, 2001
Filed:
Apr. 04, 2000
Anatoly Shteynberg, San Jose, CA (US);
Dmitry Goder, San Jose, CA (US);
Switch Power, Inc., Campbell, CA (US);
Abstract
For use with a power converter, a bias voltage generator samples a fraction of the input voltage Vin using a bias switch coupled to a tap on the power converter transformer input winding. The bias switch is driven from the same control circuit that drives the converter switch, and the fraction of Vin sampled by the bias switch is coupled to a low pass filter to generate the bias voltage Vbias. Vbias≈(Vin)·(Kf)·(Kdc), where Kf is the fractional location of the transformer tap, and Kdc is duty cycle of the power converter switch. Vbias enjoys automatic compensation against variation in Vin because the power converter will automatically compensate Kdc to correct for Vin variation. The resultant bias voltage generator requires no additional transformer winding.