The Diagnostic Method for Open-Circuit Faults in Inverters Based on Extended State Observer

Table 1

The truth table of u_co when IGBTs are working normally.

s5	s6	δc	uco
0	0	1	0
0	1	1	0
1	0	1	Udc
0	0	0	Udc
0	1	0	0
1	0	0	Udc