Electric power conversion systems – Current conversion – Including d.c.-a.c.-d.c. converter
Patent
1988-10-14
1989-09-26
Beha, Jr., William H.
Electric power conversion systems
Current conversion
Including d.c.-a.c.-d.c. converter
363 56, 363127, H02M 3335
Patent
active
048705551
ABSTRACT:
A synchronous rectifier power supply circuit has a pair of power MOS transistors connected in series with the primary and secondary of a transformer, respectively, and another power MOS transistor connected across an inductive load on the secondary side. The gates of the pair of transistors are driven by a pulse source which is pulse-width modulated in response to the load voltage, and the other transistor has its gate driven by the inverse of the pulse source. To prevent current spikes and power losses due to the pair of transistors being on during a transition period at the same time the other transistor is on, a high-gain bistable logic circuit is used to drive the gates; A NOR gate prevent the gate of the other transistor from rising to a turn-on voltage until the gates of the pair of transistors are at below a turn-on voltage. A second NOR gate prevents the gates of the pair of transistors from reaching a turn-on voltage until the gate of the other transistor is below a turn-on voltage.
REFERENCES:
patent: 4633381 (1986-12-01), Upadhyay
patent: 4716514 (1987-12-01), Patel
International Rectifier, Data Sheet No. PD-9.515A, for HEXFET Transistors IRF020 et seq., dated prior to 1988, pp. C-17, C-23, C-24.
Motorola TMOS Power MOSFET Data Book, dated prior to 1988, pp. 1-1-6 to 1-1-11.
James Blanc, "Low-Voltage MOSFETs for Use as Synchronous Rectifiers", Interface, Publication of Siliconix, Inc., Winter 1987, pp. 20-21.
Beha Jr. William H.
Compaq Computer Corporation
Graham John G.
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