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Title:
PLURAL OUTPUT SWITCHING POWER SUPPLY DEVICE
Document Type and Number:
Japanese Patent JPH0311974
Kind Code:
A
Abstract:

PURPOSE: To surely synchronize control action by providing an auxiliary secondary coil and a synchronizing circuit in each output circuit except fixed output circuits.

CONSTITUTION: A plural output switching power supply device is constituted of an input circuit 10, formed by a primary coil 2 of a transformer 1 and a transistor 11 or the like, and output circuits 20 to 40, formed by secondary coils 3 to 5 or the like, and provided with an open-close control circuit 12, voltage control circuit 60, photocoupler 61 thereof and a chopper control circuit 70 or the like. In a synchronizing circuit 90 of the chopper control circuit 70, a synchronizing signal is generated being based on voltage from an auxiliary secondary coil 80 of the transformer 1. As a result, an accurate chopper action frequency is determined.


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Inventors:
MORI BUNJI
UEKI KOICHI
Application Number:
JP14464289A
Publication Date:
January 21, 1991
Filing Date:
June 07, 1989
Export Citation:
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Assignee:
FUJI ELECTRIC CO LTD
International Classes:
H02M3/28; (IPC1-7): H02M3/28



 
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