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The single phase rectifier consisting of three thyristors 
and a diode 
feed power to a 
constant current load. 
and 
are fired at α=60° and 
is fired at α=240° . The reference for 
is the positive zero crossing of 
. The average voltage 
across the load in volts is ________ (Round off to 2 decimal places).
Since the load carries constant current one device out of T1 & D1 must always be conducting & one out of T2 T3 most always be conducting
T1 : α to π i.e. 60° to 180°
D1: π to 2π + α i.e. 180° to 360° & 0° to 60°
T2: π + α to 2π + α i.e. 240° to 240°
T3: α to π + α i.e. 60° to 240°
∴ Output voltage is
0 to 60° : D1 & T2 : ON V0 = -Vs
60° to 180° : T1 & T3 : ON V0 = Vs
180° to 240° : T3 & D1 : ON V0 = 0
240° to 360° : T2 & D1 : ON V0 = -Vs
