Power conversion device
AssigneeMitsubishi Electric Corporation
InventorRyoji Tsuruta
Life of this patent
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Abstract
A power conversion device according to the present disclosure includes: a DC/DC conversion unit including positive and negative legs composed of semiconductor switching elements connected in series, an output filter having magnetic energy storage elements connected to output ends of the legs and first and second electric energy storage elements connected in series and having a neutral point, first and second current detection units, and a voltage detection unit; and a control unit composed of a single output voltage control unit which outputs a current command value, and first and second current control units which generate gate signals on the basis of the current command value and detection current values, to control ON/OFF operations of the semiconductor switching elements, independently of each other.
Claims18
A power conversion device comprising:
- a DC/DC converter which converts DC voltage inputted from a DC power supply, to desired DC voltage;
- and
- a controller which controls the DC/DC converter, wherein the DC/DC converter includes
- a positive leg composed of a first semiconductor switching element and a second semiconductor switching element connected in series between a positive side and a negative side of the DC power supply,
- a negative leg composed of a third semiconductor switching element and a fourth semiconductor switching element connected in series, the negative leg being connected in parallel to the positive leg,
- an output filter composed of a first magnetic energy storage element on a positive side connected to an output end of the positive leg, a second magnetic energy storage element on a negative side connected to an output end of the negative leg, and a first electric energy storage element and a second electric energy storage element connected in series between the positive side and the negative side, the output filter having a neutral point which is a connection part between the first electric energy storage element and the second electric energy storage element,
- a first current detector for detecting current flowing through the output end of the positive leg, and a second current detector for detecting current flowing through the output end of the negative leg, and
- a voltage detector for detecting voltage between the positive side and the negative side, and
- the controller includes a single output voltage controller which outputs a current command value on the a basis of a detection voltage value outputted from the voltage detector and an output voltage command value for output voltage, and
- a first current controller and a second current controller which respectively generate gate signals for controlling the positive leg and the negative leg, on the a basis of the current command value and respective detection current values outputted from the first current detector and the second current detector, to control ON/OFF operations of the first semiconductor switching element and the second semiconductor switching element composing the positive leg, and ON/OFF operations of the third semiconductor switching element and the fourth semiconductor switching element composing the negative leg, independently of each other.
Dependencies are inferred from the claim text.