Thyristor is triggered at an angle (in degree), and at angle , in each cycle of the sinusoidal input voltage. Assume both thyristors to be ideal. To control the load power over the range 0 to 2 kW, the minimum range of variation in is:
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Single-phase AC voltage controller. A 200 V, 50 Hz sinusoidal source (plus terminal at the top) feeds a load through two anti-parallel thyristors, T1 (upper) and T2 (lower), connected in parallel in the top line. The load, drawn as a black block on the right, is the impedance 10∠-60° Ω. The circuit is closed through the bottom wire back to the source.
- (A)
0° to 60°
- (B)
0° to 120°
- (C)
60° to 120°
- (D)
60° to 180°