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Title:
ONE-TRANSISTOR FORWARD TYPE DC-DC CONVERTER
Document Type and Number:
Japanese Patent JPS61277373
Kind Code:
A
Abstract:
PURPOSE:To reduce the loss of a converter by fitting a tertiary winding to a conversion transformer and connecting a series circuit of the tertiary winding and a diode to an output terminal. CONSTITUTION:With one-transistor forward type DC-DC converter, a transistor (hereinafter called Tr) 2 for a main switch and a primary winding N1 for a main transformer 3 are connected in series with a DC power supply 1, and DC voltage is outputted through diodes 4, 5, a choke coil 6 for smoothing and a capacitor 7 from a secondary winding N2 for the main transformer 3. The Tr 2 is ON-OFF controlled by a control circuit 9. A tertiary winding N3' is mounted to the main transformer 3 at that time, and the tertiary winding is connected to an output terminal 8 through a diode 11. Accordingly, ON time at a time when the voltage of the DC power supply 1 lowers can be designed at a large value, thus improving the utilization factor of the windings for the transformer 3 and the Tr 2.

Inventors:
YAMASHITA TAKASHI
NAKAYAMA TOSHIMITSU
IWANAMI YOSHITOMO
Application Number:
JP11807685A
Publication Date:
December 08, 1986
Filing Date:
May 31, 1985
Export Citation:
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Assignee:
NIPPON TELEGRAPH & TELEPHONE
NEC CORP
International Classes:
H02M3/28; (IPC1-7): H02M3/28
Domestic Patent References:
JPS6059973A1985-04-06