Thyristor module to normal conduction is gate trigger signal.
When the gate trigger signal strength reaches thyristor
module and the provisions of the national standard to the thyristor is.
At this point, the forward current must be more than the prescribed standards to maintain current, otherwise, cannot conduction.
There are two kinds of situations can make the thyristor misleading: a, selection of thyristor module & other;
Off state not repetitive peak voltage & throughout;
The pressure (commonly known as positive peak
Or positive turning point voltage)
On the low side.
Puts forward voltage peak more than positive change voltage, thyristor module immediately conduction.
So when is leakage current rise sharply (
According to positive avalanche current)
, enter the carrier meet conduction conditions.
Use of over-voltage protection measures can avoid misleading.
Second, forward voltage thyristor module in lift dV/dt exceeds the specified value.
Thyristor module block when the anode is equivalent to a junction capacitance between charging capacitor current generated when tu anode voltage, the current may cause the thyristor module is misleading.
So the biggest positive voltage build-up rate for the pipe must be restricted, generally USES the resistance capacity to absorb elements on opposite sides of the thyristor module in parallel can be restricted.
Through the above content we know to avoid thyristor module mislead through two methods, respectively is the use of over-voltage protection measures and limit the maximum forward voltage rising rate of the pipe.
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