Miscellaneous active electrical nonlinear devices – circuits – and – Gating – Utilizing three or more electrode solid-state device
Patent
1991-12-11
2000-08-22
Tran, Toan
Miscellaneous active electrical nonlinear devices, circuits, and
Gating
Utilizing three or more electrode solid-state device
327304, 327109, 327434, H03K 17687
Patent
active
061078603
ABSTRACT:
A gate driver for turning on and turning off a power switching device having a capacitive gate control input provides galvanic isolation between low-level control circuitry and the power switching device by means of a transformer having a controlled amount of effective secondary leakage inductance. The secondary of the transformer is connected in series with the gate control input and a first unidirectional conducting device. Driver logic on the secondary side of the transformer controls a gate switch which is connected across the gate control input. The gate driver operates in a multiplexed mode: if a voltage pulse is applied across the primary winding of the transformer at a time when the power switching device is off the driver logic will turn the gate switch off, thereby enabling charging of the effective gate capacitance as a means of turning the power switching device on; if a voltage pulse is applied across the primary winding of the transformer at a time when the power switching device is on the driver logic will turn the gate switch on, thereby discharging the effective gate capacitance as a means of turning the power switching device off. Both the turn-on and the turn-off voltage pulses are of the same polarity. During a turn-on pulse, energy is transferred between the voltage source connected across the primary winding and the effective gate capacitance via the effective secondary leakage inductance of the transformer.
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Tabisz et al., "0-Voltage Switched Quasi-Resonant Buck and Flyback Converters", IEEE Transactions on Power Electronics, p. 194, Apr. 1989.
International Rectifier Preliminary Data Sheet No. PD-6.017, "High Voltage Current Limiting MOS Gate Driver".
International Rectifier Application Note AN-978A, 1990, "HV Floating MOS-Gate Driver IC".
Product brochure, 1990, pp. 38-44.
Tran Toan
VLT Corporation
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