Three-terminal power mosfet switch for use as synchronous rectif

Details Three-terminal power mosfet switch for use as synchronous rectif Three-terminal power mosfet switch for use as synchronous rectif

1996-05-15

1998-04-28

Callahan, Timothy P.

Miscellaneous active electrical nonlinear devices, circuits, and

Gating

Accelerating switching

327427, 327581, H03K 17687

Patent

active

057449945

ABSTRACT:
An N-channel power MOSFET is fabricated with its source and body connected together and biased at a positive voltage with respect to its drain. The gate is controlled by a switch which alternately connects the gate to the source or to a voltage which turns the channel of the MOSFET fully on. When the gate is connected to the source, the device functions as a "pseudo-Schottky" diode which turns on at a lower voltage and provides a lower-resistance path than a conventional PN diode. When the gate is connected to the positive voltage the channel of the MOSFET is turned fully on. This MOSFET switch is particularly suitable for use as a synchronous rectifier in a power converter where it reduces the power loss and stored charge in the "break before make" interval (i.e., the interval between the turn-off of the shunt switch and the turn-on of the synchronous rectifier).

REFERENCES:
patent: 4667144 (1987-05-01), Jones et al.

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