Electric power conversion systems – Current conversion – Including d.c.-a.c.-d.c. converter
Reexamination Certificate
2000-06-05
2002-04-16
Han, Jessica (Department: 2838)
Electric power conversion systems
Current conversion
Including d.c.-a.c.-d.c. converter
C363S020000, C363S089000
Reexamination Certificate
active
06373722
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates generally to processing systems and specifically to a power supply system for a processing system that provides an auxiliary output voltage.
BACKGROUND OF THE INVENTION
Typically a power supply in a desktop computer requires the maintenance of an auxiliary output voltage for the operation of the service processor and for internal house keeping. This auxiliary output voltage is generally a separate small power supply within a main power supply and is used to provide continuous current even when other power outputs are turned off. However, this small power supply adds extra cost and instrumentation to the overall system.
FIG. 1
depicts a conventional power supply system. The area enclosed by the dashed line contains a flyback auxiliary power supply
10
of the power supply system. The remaining portion represents the main power supply
11
. The main power supply
11
includes a first capacitor
26
coupled to a transformer
22
. The supply
11
also includes a transistor
36
coupled to the transformer
22
, diodes
20
,
28
,
30
, an inductor
32
coupled to diode
28
, and a second capacitor
34
coupled to the inductor
32
. The flyback auxiliary power supply
10
includes a transformer
12
. The transistor
14
is coupled to the transformer
12
and a pulse width modulator
15
. The transformer
12
is coupled to a diode
16
. The diode
16
is coupled to a capacitor
18
.
Because the flyback auxiliary power supply
10
is segregated from the main power supply system, it requires a separate transformer
12
, a separate transistor
14
, and a separate pulse width modulator
15
which increases the cost and size of the power supply system.
Accordingly, what is needed is a circuit that decreases the cost and size of the power supply system. The circuit should be simple and adaptable to existing technology. The present invention addresses such a need.
SUMMARY OF THE INVENTION
A power supply system is disclosed. The system comprises a main power supply portion, the main power portion including a transformer, and an auxiliary power portion wherein the auxiliary power portion is coupled to the main power portion via the transformer.
Through the use of the power supply system in accordance with the present invention, the auxiliary output voltage is generated by the main power portion. Therefore, a circuit in accordance with the present invention provides the auxiliary output voltage by using the same pulse width modulator and switching devices used by the main power portion. The use of a power supply system in accordance with the present invention thereby eliminates the need for the components required to maintain the auxiliary output voltage. Accordingly, system space can be saved and there is also a reduction in manufacturing costs.
REFERENCES:
patent: 5119284 (1992-06-01), Fisher et al.
patent: 5122945 (1992-06-01), Marawi
patent: 5619403 (1997-04-01), Ishikawa et al.
patent: 5636108 (1997-06-01), Taurand
patent: 5754415 (1998-05-01), Blackmon
patent: 5771160 (1998-06-01), Seong
patent: 5886880 (1999-03-01), Hisanaga
patent: 6130828 (2000-10-01), Rozman
patent: 6169667 (2001-01-01), Liu
Lindfors Eino A.
Malik Randhir S.
Han Jessica
Sawyer Law Group LLP
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