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:
Feb. 15, 2011
Filed:
Jul. 01, 2009
Matti Laitinen, Kirkkonummi, FI;
Jussi Suortti, Helsinki, FI;
Matti Laitinen, Kirkkonummi, FI;
Jussi Suortti, Helsinki, FI;
ABB Oy, Helsinki, FI;
Abstract
A method and a circuit for controlling a thyristor (V) into conducting state, the thyristor (V) being in a rectifier, which rectifier supplies DC voltage to a DC voltage circuit. The circuit comprising a trigger capacitor (C) adapted to be charged from the voltage difference across the thyristor (V) when the anode-to-cathode voltage of the thyristor is positive, a zener diode (V) adapted to be triggered with the voltage of the trigger capacitor (C), when the voltage of the trigger capacitor (C) exceeds the breakdown voltage of the zener diode (V), and an auxiliary thyristor (V) adapted to be triggered with the current from the trigger capacitor (C) flowing via the zener diode (V), wherein the cathode of the auxiliary thyristor (V) is connected to the gate of the thyristor (V) for triggering the thyristor (V) with the current from the trigger capacitor (C) flowing via the auxiliary thyristor (V) for using the thyristor (V) in a diode mode.