The main electrical parameters of thyristor are forward turning voltage VBO, forward average leakage current IFL, reverse leakage current IRL, off-state repetitive peak voltage VDRM, reverse repetitive peak voltage VRRM, forward average voltage drop VF, on-state average current IT, gate trigger voltage VG, gate trigger current IG, gate reverse voltage and maintenance current IH.
(1) Thyristor Forward Turning Voltage VBO
The forward turning voltage VBO of thyristor refers to the peak voltage when the rated junction temperature is 100 C and the gate (G) is open, and the sinusoidal half-wave forward voltage is added between the anode (A) and the cathode (K) to make it change from off state to on state.
(2) Repetitive peak voltage VDRM of thyristor in break state
Break-state repetitive peak voltage VDRM refers to the maximum peak voltage allowed between A, K (or T1, T2) poles when thyristors are blocked forward. This voltage is about the value of the forward turning voltage minus 100V.
(3) On-state average current IT of thyristor
On-state average current IT refers to the average current allowed between A, K (or T1, T2) poles in normal operation of thyristors under specified ambient temperature and standard heat dissipation conditions. (4) Reverse Breakdown Voltage VBR
Reverse breakdown voltage refers to the peak voltage applied between the anode and cathode of thyristor at rated junction temperature when the reverse leakage current increases sharply.
(4) Reverse Repetitive Peak Voltage VRRM of Thyristor
Reverse repetitive peak voltage VRRM refers to the maximum reverse peak voltage that thyristors allow to be added between A and K poles when the gate G is open. This voltage is about the peak voltage after subtracting 100V from the reverse breakdown voltage.
(5) Forward average voltage drop VF of thyristors
Forward average voltage drop VF, also known as on-state average voltage or on-state voltage drop VT, refers to the average voltage drop between anode A and cathode K, usually 0.4-1.2V, when the current through thyristor is rated current under specified ambient temperature and standard heat dissipation conditions.
