Power conversion device and power conversion system
AssigneeSharp Kabushiki Kaisha
InventorHIROKI TANAKA
Life of this patent
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Abstract
In a power conversion device, a voltage at an input/output terminal of a primary-side circuit is divided by a first capacitor and a second capacitor, and a center tap provided to the primary winding of a transformer is connected to a node between the first capacitor and the second capacitor. With this, an intermediate voltage can be output. Further, transmission power can be controlled under a state where a voltage at the first capacitor and a voltage at the second capacitor are balanced, through adjustment of switching phases of a first full bridge circuit that is the primary-side circuit and a second full bridge circuit that is a secondary-side circuit.
Claims7
A power conversion device comprising:
- a first capacitor circuit that includes a first capacitor and a second capacitor connected in series;
- a first full bridge circuit and a second full bridge circuit;
- a transformer;
- a first reactor connected between the first full bridge circuit and the transformer;
- a second reactor connected between the first full bridge circuit and the transformer;
- a third reactor connected between the second full bridge circuit and the transformer;
- and
- a controller, wherein
- the first full bridge circuit includes
- a first switching leg that includes a first switching element and a second switching element connected to each other, and
- a second switching leg that includes a third switching element and a fourth switching element connected to each other,
- the first full bridge circuit is connected in parallel to the first capacitor circuit,
- the transformer includes a center tap at primary winding and the center tap is connected to a node between the first capacitor and the second capacitor,
- one end of the first reactor is connected to a node between the first switching element and the second switching element,
- one end of the second reactor is connected to a node between the third switching element and the fourth switching element,
- the second full bridge circuit includes
- a third switching leg that includes a fifth switching element and a sixth switching element connected to each other, and
- a fourth switching leg that includes a seventh switching element and an eighth switching element connected to each other,
- one end of the third reactor is connected to a node between the fifth switching element and the sixth switching element,
- the first switching element to the eighth switching element are connected in parallel to respective capacitors, and
- the controller controls switching of the first switching element to the eighth switching element to adjust a retardation of switching between the first full bridge circuit and the second full bridge circuit and controls transmission power.
Dependencies are inferred from the claim text.