Adaptive rcd snubber and method for switching converter
AssigneeABB Research Ltd.
InventorsKi-Bum PARK, Francisco CANALES, Sami PETTERSSON
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Abstract
Exemplary embodiments provide a method and an adaptive RCD snubber circuit for a switching converter having a series-connection of a main inductor and a main switching device. A voltage stress of the main switching device is sensed, and the sensed voltage stress is controlled to a reference level by controlling a snubber capacitor voltage, wherein the snubber capacitor voltage is controlled by adjusting the snubber resistance of the RCD snubber.
Claims9
An adaptive RCD snubber circuit for a switching converter having a series-connection of a main inductor and a main switching device, the snubber circuit comprising:
- a snubber capacitor and a snubber diode;
- a controllable snubber resistance;
- means for sensing a voltage stress of the main switching device;
- and
- a snubber capacitor voltage controller configured to control the sensed voltage stress to a reference level by controlling a snubber capacitor voltage, the snubber capacitor voltage being controlled by adjusting the controllable snubber resistance.
A method for a switching converter having a series-connection of a main inductor and a main switching device and a RCD snubber circuit, the method comprising:
- sensing a voltage stress of the main switching device, and
- controlling the sensed voltage stress to a reference level by controlling a snubber capacitor voltage, wherein the snubber capacitor voltage is controlled by adjusting the snubber resistance of the RCD snubber.
Dependencies are inferred from the claim text.