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:
Sep. 19, 2006
Filed:
May. 02, 2005
Erkki Miettinen, Helsinki, FI;
Erkki Miettinen, Helsinki, FI;
ABB Oy, Helsinki, FI;
Abstract
Control circuit for an IGB transistor, which comprises means (T, V, C, C) for generating auxiliary voltage, a first and a second controllable control switches (V) connected in series between the auxiliary voltage, and a gate resistor (Rg). The control circuit further comprises a boost capacitor (Cg) connected in series with the gate resistor (Rg), a resistor (R) whose first terminal is connected to the second terminal () of the boost capacitor and whose second terminal is connected to the intermediate voltage level of the auxiliary voltage of the control switches, a Zener diode (V) whose anode is connected to the point between the gate resistor and the boost capacitor and whose cathode is connected to the point between the boost capacitor and the resistor (R), and a diode (V) whose anode is connected to the cathode of the Zener diode (V) and whose cathode is connected to the positive terminal of the auxiliary voltage of the control switches.