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:
Jul. 14, 1998
Filed:
Oct. 31, 1996
Richard C Myers, McMinnville, OR (US);
Hewlett-Packard Company, Palo Alto, CA (US);
Abstract
A driver for a power transistor (a MOSFET or IGBT) uses a transformer to isolate the power supply from the control signal, but uses very low power components on the isolated side to allow use of a physically small transformer. The control signal is one of two frequencies, and the isolated side of the driver includes a circuit for detecting which of the two frequencies is present. One frequency is preferably twice as much as the other. The output of the frequency detection circuit switches between low and high states depending on the frequency present, and the output of this circuit is connected to the input of a transistor driver circuit which charges the gate of the power transistor.