MOSFET inverter gate drive circuit

Details MOSFET inverter gate drive circuit MOSFET inverter gate drive circuit

1986-08-07

1987-08-25

Salce, Patrick R.

Electric power conversion systems

Current conversion

Including d.c.-a.c.-d.c. converter

363134, H02M 7538

Patent

active

046897313

ABSTRACT:
An inverter for producing A.C. from a source of D.C. electric power. The power circuit includes a power transformer with the current flow through the two halves of the primary winding 16 being controlled by a pair of power MOSFETs. A gate driver circuit which includes a driver transformer produces control signals which are substantially 180.degree. out of phase across the center tapped secondary winding of the driver transformer. A pair of fast-off, slow-on coupling circuits consisting of a diode connected in parallel with a resistor couples gate control signals to the gates of the power MOSFETs. Each coupling circuit is effectively in series with one of a pair of current limiting off-time setting resistors, the latter being connected in series with the two halves of the primary winding of the gate driver circuit control transformer. The relationship of resistances of the resistors of the coupling circuits to the resistance of the current limiting resistors of the gate driver circuit determines the difference between the turn-off time and the turn-on times of the MOSFETs. The current limiting resistors prevent burnout of the gate driver contact transformer and the gate control transistors.

REFERENCES:
patent: 4308577 (1981-12-01), Mentler
patent: 4499530 (1985-02-01), Onda et al.
patent: 4591964 (1986-05-01), Kemstedt

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