GTO thyristor

Block appearance in REPEAT VISION

 The GTO thyristor block is a simplified model of gate turn-off thyristor. The circuit for replacing such thyristor consists of a key that determines the thyristor resistance (when activated, it is equal to the internal resistance, and when deactivated, it is equal to the resistance in the closed state) depending on the logic signal (if 1 is applied to the control input and voltage on the thyristor is greater than the value of forward bias voltage, the gate turn-off thyristor is open; if any of the above conditions are not met, the thyristor is deactivated). Equivalent circuit of gate turn-off thyristor with isolated gate and its CVD is given in figures below Fig. 1 and Fig. 2.

Fig. 1 Gate turn-off thyristor replacement circuit

 In this circuit:

 G - control signal (can take a value equal to either 0 or 1; 0 corresponds to the closed position of the thyristor and 1 to the open position);

 I - value of thyristor current, [А];

 \(U_{ac}\) - voltage between anode and cathode, [V];

 \(R_{on}\) - resistance of thyristor in open state, [Ohm];

 \(U_f\) - forward bias voltage of transistor p-n movement, [V].

Fig. 2 CVD of gate turn-off thyristor

 The CVD of the gate turn-off thyristor reflects the logic of its operation. So, when voltage is applied between the anode and the cathode, less than \(U_f\), the gate turn-off thyristor will be in a closed state, regardless of the control signal magnitude. The 0-3 CVD section corresponds to such conditions. The CVD slope in this case is determined by the value of the set resistance in the closed state. If voltage is supplied greater than \(U_f\) and a control action is equal to 1, the gate turn-off thyristor opens and is described by the 0-1 section of the CVD. The CVD slope in this case is determined by \(R_{on}\). When voltage is supplied greater than \(U_f\) and a control action is equal to 0, the gate turn-off thyristor closes and is described by the 0-2 section of the CVD. The CVD slope in this case is determined by the gate turn-off thyristor resistance in the closed state.

1.  Properties

Property	Default Value	Description	Units of measurement
Internal resistance	1e-3	-	Ohm
Turn-off resistance	1e12	-	Ohm
Forward voltage	1	-	V
Snubber circuit	On	-	-
Snubber resistance	1e6	Available, when Snubber circuit - On	Ohm
Snubber capacitance	1e9	Available, when Snubber circuit - On	F

2.  Inputs and outputs

Parameters	Input/Output	Description	Units of measurement	Port type
Control input	Input	-	-	Automation
+	Input	-	-	Electronics
-	Output	-	-	Electronics

In order to see the connection capabilities of the block, you need to go to page Description of block ports