Energy conserving drive circuit for switched mode converter util

Details Energy conserving drive circuit for switched mode converter util Energy conserving drive circuit for switched mode converter util

Filed on

1981-04-24

Date issued

1983-01-25

Examiner

Shoop, William M.

Patent Class

Electric power conversion systems

SubClass

Current conversion

SubSubClass

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

Other Related Categories

363 49, 363 56, 323901, H02M 3335

Type

Patent

Status

active

Patent number

043707017

Description

ABSTRACT:
An energy conserving drive circuit is provided for switched mode power converters having a transformer with primary current controlled by a main power switch whose conduction is in turn controlled by a pulse width modulator. Transformer leakage inductance energy is applied to drive the pulse width modulator and the main power switch in a run mode after start-up. The drive circuit includes an improved non-dissipative snubber network which supplies the drive power for the main power switch and which also disables a start-up circuit.

REFERENCES:
patent: 4031453 (1977-06-01), Teuling
patent: 4093877 (1978-06-01), Pollmeier
patent: 4156273 (1979-05-01), Sato
patent: 4246634 (1981-01-01), Purol
patent: 4261032 (1981-04-01), Cavigelli
patent: 4268898 (1981-05-01), Brown
Whitcomb, et al., "Designing Non-Dissipative Current Snubbers for Switched Mode Converters", Proceedings of the Sixth National Solid-State Power Conversion Conference, May, 1979.
William J. Shaughnessy, "Modelling and Design of Non-Dissipative LC Snubber Networks", Proceedings of the Seventh National Solid-State Power Conversion Conference, Mar. 1980.
Robert J. Boschert, "Flyback Converters: Solid-State Solution to Low-Cost Switching Power Supplies", Electronics, Dec. 21, 1978, pp. 100-104, Fig. 3.
Toshio Fujimura et al., "Wide-Range and High Efficiency Switching Power Supply for Color TV Receivers", IEEE Transactions on Consumer Electronics, vol. CE-24, No. 3, Aug. 1978, pp. 473-479.

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