In order to conduction thyratron (
Or the bidirectional thyristor
, must be a gate current ≧ IGT, to load current to ≧ IL.
Must satisfy the conditions, and follow the low temperature may encounter consideration;
To disconnect (
Or the bidirectional thyristor)
The load current must & lt;
IH and maintain long enough, can make back to by the state.
Under the possible high operating temperature must meet the above conditions;
Design a bidirectional thyristor trigger circuit, whenever possible, to avoid 3 + quadrant (
In order to reduce noise absorption, and fell to a low gate wire length.
Return line connected directly to MT1 (
If use the hard line, with double spiral or shielded wire.
Add resistance between gate and MT1 Ω 1 k or smaller.
High-frequency bypass capacitors and the gate electrode series resistance.
Another solution, selection of H series bta and low sensitivity;
If the dVD/dt or dVCOM/dt may cause problems, between MT1 and MT2 join RC buffer circuit.
If high dICOM/dt may cause the problem, add a few mH series inductance and load.
Another solution, the Hi -
Com bidirectional thyristor module;
If the bidirectional thyristor module VDRM is serious, the power of the abnormal moment may be beyond, in the process of using one of the following measures: load series inductance for several mu H unsaturated inductance, to limit the dIT/dt.
With MOV jumper in the power supply, and filter circuit in power supply side;
Choose good two-way thyristor gate trigger circuit, to avoid the working condition of 3 + quadrant, can large extent improve two-way thyristor module of dIT/dt to bear ability;
If the dIT/dt of bidirectional thyristor module may be beyond, the load on a few mu H series coreless induction or negative temperature coefficient thermistor.
Another solution: to resistive load using zero voltage conduction;
Bidirectional thyristor device fixed to the radiator, to avoid the bidirectional thyristor module under stress.
Fixed, and then welding wire.
Don't put the rivet core shaft device interface side;
In order to long-term reliable operation, should guarantee the bidirectional thyristor Rth j -
A low enough for Tj is not higher than Tjmax, its value corresponding to the possible high ambient temperature.
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