Switching mode DC-to-DC power supply with improved current sensi

Details Switching mode DC-to-DC power supply with improved current sensi Switching mode DC-to-DC power supply with improved current sensi

1988-10-14

1990-05-22

Salce, Patrick R.

Electric power conversion systems

Current conversion

Including automatic or integral protection means

363 21, 363 95, 361 93, 361111, H02H 7122, H02M 3335

Patent

active

049282204

ABSTRACT:
A switching rectifier power supply circuit has a power MOS transistor connected in series with half of the primary of a center-tapped transformer, and has rectifiers in series with an inductive load on the secondary side. The gate of the power transistor is driven by a pulse source which is pulse-width modulated in response to the load voltage, and also controlled in response to the current through the power transistor. To prevent leading-edge current spikes due to turn-on of the power transistor from adversely affecting the pulse-width modulator, yet allow trailing-edge current spikes due to transformer saturation to be compensated for, an inhibit circuit is included in the control path responding to current through the power transformer.

REFERENCES:
patent: 4330816 (1982-05-01), Imazeki et al.
patent: 4355353 (1982-10-01), Farrer
patent: 4456950 (1984-06-01), Cordy, Jr.
patent: 4811184 (1989-03-01), Koninsky et al.
International Rectifier, Data Sheet No. PD-9.515A, for HEXFET Transistors IRFR020 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.

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