US 6,674,654 B2Granted

DC-DC voltage converter

AssigneeHewlett-Packard Development Company, L.P.

InventorsBradley D. Winick, Robert B. Smith, David R. Maciorowski

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Abstract

A DC—DC voltage converter has a controller, two switches, a transformer and two rectifying diodes. The transformer has a first winding, a second winding and a center tap. Input voltage is connected between the center tap and ground. An anode of each diode is connected to the outer ends of the two windings and the cathodes of the two diodes are connected together to provide a positive output with respect to ground. Each switch is connected between an outer end of one winding and ground. The controller generates control signals to turn the switches on and off for limited periods of time in phase opposition to alternately connect the outer ends of the first and second winding to ground to cause current to flow alternatively in one of the windings and induce a voltage in the other winding that is additive to the input voltage, thereby providing an output voltage greater than the input voltage. The converter provides stable operation with good voltage regulation over a wide range of load conditions without the use of feedback.

Claims10

Dependent claims

A DC—DC converter comprising:

an input having a first terminal and a second terminal;
an output having a first terminal and a second terminal;
a transformer having a first winding and a second winding, each winding having a first end and a second end;
the first end of each winding being connected to the first terminal of said input;
first and second rectifying diodes, each diode having a first terminal and a second terminal;
the first terminal of said first diode being connected to the second end of the first winding;
the first terminal of said second diode being connected to the second end of the second winding;
the second terminal of each said diode being connected to the first terminal of said output;
first and second switches that turn on and off in response to control signals, each switch being connected between the second end of one of the first and second windings of said transformer and the second terminal of said output;
and
a controller for generating first and second control signals for controlling said first and second switches to turn on and off alternately at a selected repetition frequency.

8 more elements

Dependencies are inferred from the claim text.

Facts

Application: 10/108,940Filed 27 Mar 2002 · division
Priority: 31 Jul 2001
Published: US 2003/0026112 A16 Feb 2003
Granted: 6 Jan 2004
Term ends: Not estimatedThe source records don’t support an estimate.

Classification3 codes

H02M 3/158
With automatic control of output voltage or current, e.g. switching regulators: including plural semiconductor devices as final control devices…
H02M 3/3372
In push-pull configuration: of the parallel type
H02M
Apparatus for conversion between ac and ac, between ac and dc, or