Power conversion device
AssigneePanasonic Intellectual Property Management Co., Ltd.
InventorsYusuke IWAMATSU, Shusaku GOTO, Akira TERASAWA
Life of this patent
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Abstract
Provided is a power conversion device capable of suppressing common-mode voltage fluctuation resulting from output voltage transitioning. A power conversion device 1 is provided with N voltage control units 21 to 2N, a full-bridge conversion unit having four switches QB1 to QB4, a clamp unit having holding switches QC1 and QC2, and a control unit 5. The control unit controls the four switches QB1 to QB4, the holding switches QC1 and QC2, the pairs of regenerative switches Q11 to Q1N and Q21 to Q2N and pairs of input switches Q31 to Q3N and Q41 to Q4N of each of the N voltage control units 21 to 2N. As a result, the control unit can switch an output voltage V1 between 2N+3 levels.
Claims18
A power conversion device, comprising:
- a first input point and a second input point to which a main voltage source is electrically connected;
- a first output point and a second output point;
- N number of voltage control units to which voltage sources having mutually different power source voltages are electrically connected;
- a conversion unit provided with four switches and configured to invert the polarity of an input DC voltage to generate an output voltage at the first output point and the second output point;
- and
- a clamp unit provided with a holding switch and configured to hold the output voltage at a predetermined voltage,
- wherein the number N of the voltage control units is an integer of 1 or more,
- each of the N voltage control units includes a pair of regenerative switches configured to open and close an electrical path interconnecting the corresponding voltage source and the conversion unit and a pair of input switches configured to open and close an electrical path interconnecting the main voltage source and the conversion unit, and
- the power conversion device further comprises a control unit configured to switch the output voltage in 2N+3 steps by controlling the four switches of the conversion unit, the holding switch, the pair of regenerative switches and the pair of input switches of each of the N voltage control units.
Dependencies are inferred from the claim text.