Transformer based active snubber

For series connected devices

Description

It is proposed to use a pulse transformer arrangement within an active snubber circuit to reduce the voltage rating of the semiconductor switch device at the expense of the device current rating, as shown in figure. Using this arrangement offers an additional degree of freedom in the adjustment of the voltage across the terminals of the semiconductor switching components, which reduces the restrictions on the choice of these components. For example, it would be possible to use single lower voltage power semiconductor (<600V) for active snubber application alongside the 8.5 kV thyristor considered above. Effectively substituting series connection of high power semiconductor devices with pulsed transformer with low voltage semiconductor device connected on the secondary.

TRL SCALE

TRL SCALE 2

Application domain

  • Series connected devices
  • Active snubbers
  • HVDC LCC

Advantages

  • Low voltage devices can be used within active snubber circuit
  • Can be applied to any converter using series connected devices
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