Power supply having two switch-mode power supply units

Details Power supply having two switch-mode power supply units Power supply having two switch-mode power supply units

2003-09-29

2008-09-09

Sterrett, Jeffrey L. (Department: 2838)

Electric power conversion systems

Current conversion

With condition responsive means to control the output...

C348S086000, C307S080000

Reexamination Certificate

active

07423893

ABSTRACT:
A power supply has first and a second switch-mode power supply (SMPS) units, which both contain a transformer having a primary winding and at least one secondary winding, and a driver stage. The power supply furthermore has a normal operating mode, in which both SMPS units are in operation, and a standby operating mode, in which the first SMPS unit is switched off by a control voltage. In the standby mode, the control voltage is also used to reduce the switching frequency of the second SMPS unit, for example by means of a connection, which reduces the oscillation frequency of the oscillator of the second driver stage. In a preferred exemplary embodiment, the output of a first driver stage is furthermore connected via a series circuit to the oscillator input of a second driver stage, for synchronization purposes.

REFERENCES:
patent: 4788591 (1988-11-01), Decraemer
patent: 5369564 (1994-11-01), Choi
patent: 5852550 (1998-12-01), Majid et al.
patent: 5910891 (1999-06-01), Jo
patent: 5920466 (1999-07-01), Hirahara
patent: 5949660 (1999-09-01), Rehm et al.
patent: 6408148 (2002-06-01), Yamamoto
patent: 6462437 (2002-10-01), Marmaropoulos et al.
Search Report Dated Feb. 19, 2004.

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