Composite mosfet cascode switches for power converters
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United States of America Patent
Stats
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Nov 19, 2002
Grant Date -
N/A
app pub date -
Oct 2, 2001
filing date -
Oct 2, 2001
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Composite switches comprising multiple mosfets arranged in cascode which achieve higher efficiency and faster switching are revealed. The gate of a lower mosfet, a low voltage small die size mosfet, is driven with a conventional control circuit for modulation of the composite switch. The upper mosfet, a large die size high voltage mosfet, is controlled at its source terminal by the smaller mosfet while the gate of the upper mosfet is connected to a capacitor whose voltage remains fixed such that no net drive power is required by the gate circuit to drive the upper mosfet. The composite switch simultaneously achieves the low conduction losses of a large die device with the gate drive losses and fast switching of a small die device.
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Patent Citation Ranking
- 11 Citation Count
- H03K Class
- 55.07 % this patent is cited more than
- 23 Age