Thyristor with Reverse Recovery
Purpose
Behavioral model of a thyristor (SCR) with reverse recovery.
Library
Electrical / Power Semiconductors
Description
This component is a behavioral model of a thyristor which reproduces the effect
of reverse recovery. The effect can be observed when a forward biased thyristor is
rapidly turned off. It takes some time until the excess charge stored in the thyristor
during conduction is removed. During this time the thyristor represents a
short circuit instead of an open circuit, and a negative current can flow
through the thyristor. The thyristor finally turns off when the charge is swept
out by the reverse current and lost by internal recombination. The same
effect is modeled in the Diode with Reverse Recovery and described there in
detail.
Parameters
-
Forward voltage
- Additional dc voltage
in volts (V) between anode and
cathode when the thyristor is conducting. The default is 0.
-
On-resistance
- The resistance
of the conducting device, in ohms (
). The
default is 0.
-
Off-resistance
- The resistance
of the blocking device, in ohms (
). The
default is inf. If thyristors are connected in series (e.g. in a rectifier leg), the
off-resistance must have a large finite value.
-
Continuous forward current
- The continuous forward current
under test
conditions.
-
Current slope at turn-off
- The turn-off current slope
under test
conditions.
-
Reverse recovery time
- The turn-off time
under test conditions.
-
Peak recovery current
- The absolute peak value of the reverse current
under
test conditions.
-
Reverse recovery charge
- The reverse recovery charge
under test conditions.
If both
and
are specified, this parameter is ignored.
-
Lrr
- This inductance acts as a probe measuring the
. It should be set to a
very small value. The default is 10e-10.
Probe Signals
-
Thyristor voltage
- The voltage measured between anode and cathode.
-
Thyristor current
- The current through the thyristor flowing from anode to
cathode.
-
Thyristor conductivity
- Conduction state of the internal switch. The signal
outputs 0 when the thyristor is blocking, and 1 when it is conducting.
References
-
- A. Courtay, "MAST power diode and thyristor models including automatic
parameter extraction", SABER User Group Meeting Brighton, UK,
Sept. 1995.