Fault detector for anti-parallel thyristor

A fault detector for an anti-parallel thyristor, which detects fault of first and second thyristors connected in anti-parallel to each other, the fault detector comprising:

• a power supply unit configured to supply power to the first and second thyristors;
• a first current sensor configured to output a first current measurement value that flows through the first thyristor;
• a second current sensor configured to output a second current measurement value that flows through the second thyristor;
• a comparator including a first input terminal connected to the first current sensor and a second input terminal connected to the second current sensor, wherein the comparator does not output a discrete signal when the first or second current measurement value is in a normal range, and outputs the discrete signal when the first or second current measurement value is in a fault range;
• a detection logic connected to an output terminal of the comparator;
• and
• first and second output units connected to the detection logic.