Category | Thyristors

Proton Irradiation Technology

Posted on 30 May 2020

Control of recombination features in the layers of the semiconductor elements is considered to be one of the most effective methods of increasing performance and many other characteristics of power semiconductor devices (PSDs). Below is a description of an automatically controlled operation line for proton irradiation of PSDs. This technology helps to selectively introduce recombination [...]

Rated Current Load for Thyristors

Posted on 28 May 2020

              When determining the maximum permissible forward current for thyristors, the pulsing of the equivalent junction temperature at the operating frequency has to be taken into account. Thyristors that change the current conduction angle in order to control the output voltage produce rectangular pulses with shorter current conduction angles [...]

Safe Firing of Thyristors

Posted on 09 May 2020

              When a thyristor fires, the current and voltage of the firing pulse must lie within a safe firing region (BSZ in figure 1). This of course includes the requirement that the maximum permissible gate power (PG) specified for various pulse times tp is not exeeded. Figure 1. Voltage [...]

Criteria for Successful Selection of Diodes and Thyristors

Posted on 23 April 2020

              Thyristor and Rectifier Dimensioning and Selection The general guidelines given in the article "Criteria for Successful Selection of IGBT and MOSFET Modules" are to be applied by analogy to the selection of thyristors, rectifier diodes and thyristor/diode modules. For operation at a line frequency of 50/60 Hz, any additional [...]

Reliable Thyristor Triggering

Posted on 12 April 2020

              To ensure that a thyristor is triggered reliably and safely when the main current increases steeply, a trigger pulse current sufficiently larger in amplitude than the gate trigger current IGT (≥ 5⋅ IGT) and with a sufficient rate of rise (≥ 1 A/μs) is needed. Even if the [...]

Teaching Tool for IGBTs and Thyristors

Posted on 03 February 2020

  For educational purposes the 'SemiTeach IGBT'  and 'SemiTeach Thyristor' are ideal tools for universities, professional schools, and laboratorities to simulate and demonstrate curcuits. One stack can simulate almost all existing industrial applications: 3-phase inverter+brake chopper; buck or boost converter; single phase inverter; single or 3-phase rectifier.   Features: Multi-function IGBT converter Transparent enclosure to [...]

Motor Control - Soft-Start Control of Electric Motors

Posted on 01 February 2020

  For a three-phase induction motor, direct on-line start involves a very high motor starting torque and a very high starting current. Semiconductors in soft-start devices must be extremely robust to resist considerable chip temperature changes and must demonstrate very good load cycle capability. The antiparallel thyristor module SEMISTART for soft-starters provides half the internal [...]