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US RE38,082 E1Granted
High frequency pulse transformer for an IGBT gate drive
AssigneeKollmorgen Corporation
InventorSaso P. Vlahu
Life of this patent
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Abstract
A pulse transformer for use in a high frequency motor controller to isolate the electronic control stages from the power stages in a motor controller. The primary and secondary windings are wound on a common ferrite core and spaced apart from one another. The wire size used for the windings is relatively small (gauge 37 or less). Each of the windings has between 10 and 13 turns. The interwinding capacitance must be below 5 picofarads, preferably below 1 picofarad, and most preferably below 0.2 picofarads.
Claims8
A high frequency, isolation pulse transformer capable of operating at a pulse rate greater than 6,000 Hertz, comprising:
- a high permeability core;
- a primary winding wound on said core;
- a secondary winding wound on said core;
- said windings being spaced apart and configured so that the capacitance between said windings is less than 5 picofarads;
- and
- said core being suitable so that only the leading and trailing edges of applied pulses pass through said transformer.
3 more elements
Dependencies are inferred from the claim text.