Thyristor module as a switching device, when the duration of the trigger pulse is short, must increase pulse amplitude, pulse width at the same time also depends on the anode current to achieve with the current time.
In the system, as a result of the existence of perceptual load, anode current rising rate is low, if not exert wide pulse triggering, thyristor
module is often unable to maintain on state.
Considering load is strong emotional situation, this system USES high level trigger, the downside is thyristor module loss is too big.
Thyristor module in the application process, the factors affecting the cut-off time is junction temperature, the current state and its decline rate, the reverse recovery rate drop, reverse voltage, and current forward dv/dt value, etc.
With the greatest effect in the junction temperature and reverse voltage, knot WenYu is high, the cut-off time is long;
The higher the back pressure, the cut-off time is short.
In the system, because of the existence of perceptual load in the converter, the inductance will produce a lot of back emf at both ends.
The abnormal voltage on both ends of thyristor module, easy to cause damage of thyristor module.
In order to prevent this kind of situation, usually adopts the surge voltage absorbing circuit.
As a result of the existence of perceptual load, increase the trigger pulse width should be considered, otherwise the thyristor module before the qing live current anode current reached, trigger signal is abate, may be the cause of thyristor module can't normal conduction.
When shut off, the perceptual load also poses some problems for the thyristor module.
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