DETECTION OF WELDED SWITCH CONTACTS IN A LINE CONVERTER SYSTEM

WIPO Patent Application WO/2011/153427

A3

A system for the detection of welded contacts in a circuit of a line converter system has a plurality of inverter switches ( S1-S4), a plurality of utility switches (Κ1-Κ4) in which a pair of utility switches is connected in series through a line to a utility (34), a voltage detector (12), an electronic controller (10), and a DC input source (32). The line converter system converts incoming DC power into AC output power that is delivered to the utility grid (34). The voltage detector (12) measures the voltage across a first node (X) and a second node (Y) of the circuit and provides an output that is interpreted by an electronic controller (10) for each step performed during a method of detection of welded contacts. The detection method has a sequence of test steps in which at least one switch (K1-K4) is opened and/or closed, a DC bus (31) of the inverter or the utility grid (34) is used as a stimulus voltage, and the voltage is measured. If a voltage is not detected across the first and second nodes, the test sequence is continued until a welded contact is detected or the electronic controller determines that none of the contacts are welded.

GOKHALE KALYAN P (US)
KARRAKER DOUGLAS W (US)
PAJARI ILKKA T (US)
JUSSILA MATTI T (FI)

PCT/US2011/039053

October 17, 2013

June 03, 2011

Click for automatic bibliography generation  

ABB INC (US)
ABB OY (FI)
GOKHALE KALYAN P (US)
KARRAKER DOUGLAS W (US)
PAJARI ILKKA T (US)
JUSSILA MATTI T (FI)

H01H47/00; H02M7/48

JPH10144194A	1998-05-29
DE102006030751A1	2007-12-27
EP2228895A1	2010-09-15

SZCZEPANIK, Melissa, J. (29801 Euclid AvenueWickliffe, OH, US)

View/Download PDF      PDF Help

Previous Patent: LIQUID CRYSTAL DISPLAYS

Next Patent: SYSTEM AND METHOD FOR ASSESSING A LIKELIHOOD OF A PATIENT TO EXPERIENCE A FUTURE CARDIAC ARRHYTHMIA ...