Low power, dual output AC/DC and DC/DC converter

Details Low power, dual output AC/DC and DC/DC converter Low power, dual output AC/DC and DC/DC converter

2002-03-01

2003-11-18

Riley, Shawn (Department: 2838)

Electricity: power supply or regulation systems

Output level responsive

Using a three or more terminal semiconductive device as the...

C307S031000, C307S033000

Reexamination Certificate

active

06650095

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a low power AC/DC and DC/DC converter. In particular, the invention relates to an AC/DC and DC/DC converter having a circuit topology of the buck (or step down or forward) type or of the buck-boost (or step up/down or flyback) type.
2. Description of the Related Art
As is known, AC/DC and DC/DC converters having a circuit topology of the buck type or of the buck-boost type use inductive components the charging and discharging of which are controlled by switches that switch between a saturation and an inhibition condition (ON/OFF).
For a more detailed treatment of AC/DC and DC/DC converters of the type referred to above, see, for example, J. G. Kassakian, M. F. Schlecht, G. C. Verghese “Principles of Power Electronics,” Addison Wesley.
In certain applications, AC/DC and DC/DC converters having dual outputs are required, i.e., converters able to supply both a positive voltage and a negative voltage. For this purpose (see, for example, the standard buck converter of FIG.
1
), an inductor
1
belonging to an output filter
2
has a first winding
1
a
connected to a first output
3
and a second winding
1
b
, appropriately coupled to the first winding
1
a
, connected to a second output
4
through a second output filter
5
.
The above solution is adequate in the case of converters with a high output current, where wound inductors are used; however, it is not convenient in the case of converters supplying a low output current, where the inductor is formed by an axial inductor insulated in lacquer, that has a low cost and small dimensions.
BRIEF SUMMARY OF THE INVENTION
An embodiment of the present invention provides a converter that is able to supply a dual output without requiring the use of a double winding inductor. An inductor that can be used in the case of a non-insulated converter.
In one embodiment of the present invention there is provided a converter comprising a first input receiving an input voltage, a first output supplying a first output voltage having a first sign, a second output supplying a second output voltage having a second sign opposite to the first sign, a controlled switch connected between the first input and a first intermediate node, a first component connected between the first intermediate node and the first output, and a second component connected between the first intermediate node and a second intermediate node, one of the first and second components comprising an inductive element, and another of the first and second components comprising a unidirectional current conducting element, the converter being a dual voltage generating circuit connected between the second intermediate node and the second output.


REFERENCES:
patent: 3328674 (1967-06-01), Bleicher
patent: 3671853 (1972-06-01), Weischedel et al.
patent: 5119013 (1992-06-01), Sabroff
patent: 5886508 (1999-03-01), Jutras
patent: 5896284 (1999-04-01), Murasato et al.
patent: 6400588 (2002-06-01), Peron

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