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Posted on 21 April 2019

Drive Pulse Generation

 

 

 

 

 

 

 

Integrated circuits which are used for drive pulse generation, phase comparison with the terminal voltage, synchronisation and so on, facilitate driver design considerably.

Owing to the power that can be dissipated by an integrated circuit (IC), however, it is not possible to extract a drive pulse with sufficient power directly. Instead, an output amplifier stage has to be added between the IC  output and the driver transformer.

An important requirement here is drive pulse symmetry. Any asymmetry generates additional harmonic content and DC current components. On the other hand, the harmonics and voltage peaks (commutation notches and turn-off overvoltage) generated by the working converter itself must not affect driver function.

For intermittent current, thyristors in six-pulse bridge configurations (B6c) result in two current pulses, the second being generated 60° after the first. In addition, on device turn-on two legs must be triggered at the same time. This is why in B6c circuits the driver has to deliver two pulses 60° apart.

To ensure reliable function, sufficient isolation from the load circuit is needed for the driver IC’s to generate pulses.

 

For further information, please read the following articles:

Driver Signal Pulse Length

Driver Units for Thyristors

Pulse Transformer Requirements

Criteria for a Successful Selection of IGBT and MOSFET Modules

 

 

 

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