AC current detector and power supply circuit

Details AC current detector and power supply circuit AC current detector and power supply circuit

1992-08-26

1995-09-26

Wong, Peter S.

Electric power conversion systems

Current conversion

Including automatic or integral protection means

363131, H02M 3315, H02H 712

Patent

active

054539234

ABSTRACT:
An full bridge Zero-Voltage-Switched DC/DC converter with the four MOSFET snitches feeding the primary winding (T1) of the output transformer (T1) through a series inductance (L) and a series DC blocking capacitance (C) uses two MOSFET asynchronous rectifiers ((Q2) in its full wave output section. Each ((Q2) is serially connected between the output transformer (T1) and the output shunt capacitance (C') through the primary winding (T21) of a transformer detecting its drain current. The secondary winding (T22) of the detector transformer is shunted by a pair of resistances (R1/R'1) each in series with the base-emitter junction of a bipolar transistor (Q1/Q'1), the two transistors of complementary polarity forming a totem-pole branched across an auxiliary winding (T12) of the output transformer. The totem-pole output coupled (R2) to the gate of the MOSFET (Q2) switches its state upon the drain current value crossing the adjustable (R1/R'1) low value of the detector transformer magnetising current.

REFERENCES:
patent: 3600657 (1991-08-01), Pfaff
patent: 4340931 (1982-07-01), Endo et al.
patent: 4717994 (1988-01-01), Diaz et al.
patent: 4937722 (1990-06-01), Deierlein
patent: 4969081 (1990-11-01), Shekhawat et al.
High-Frequency Switching Power Supplies: Theory and Design, G Chryssis, McGraw-Hill Publishing Co. 1989, pp. 144-149, 150-153, 202-203 and 220-221.
"MOSFETS Move In On Low Voltage Rectification (TA84-2)", R. Blanchard et al, Silicon MOSpower Application Handbook, Siliconix, Inc. 1984, Sec. 5.6, pp. 5.69-5.86.
"An Assessment of the Use of Resonant-Mode Topologies for High-Frequency Power Conversion", S. Weinbert et al, Proceedings of the European Space Power Conference, Madrid, Spain Oct. 2-6, 1989, pp. 331-337.
"The Design of a High Efficiency, Low Voltage Power Supply Using MOSFET Synchronous Rectification and Current Mode Control", R. Blanchard et al, IEEE Specialists Conference Record, 1985 pp. 355-361.

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