| US 7,485,987 B2 | ||
| Power converting device | ||
| Osamu Mori, Tokyo (Japan); Masaki Yamada, Tokyo (Japan); and Akihiko Iwata, Tokyo (Japan) | ||
| Assigned to Mitsubishi Denki Kabushiki Kaisha, Tokyo (Japan) | ||
| Filed on Feb. 23, 2006, as Appl. No. 11/359,962. | ||
| Prior Publication US 2007/0194627 A1, Aug. 23, 2007 | ||
| Int. Cl. H02J 1/00 (2006.01) | ||
| U.S. Cl. 307—63 [307/82; 307/105] | 15 Claims |
| 1. A power converting device comprising:
a plurality of single-phase inverters, each single-phase inverter receiving DC power from a respective DC power supply and
producing AC power at an AC-output side, the AC-output sides of the single-phase inverters being connected in series; and
a control device for controlling each of the single-phase inverters to deliver an output current corresponding to a predefined
output current, the plurality of single-phase inverters producing an output voltage that is the sum of respective output voltages
generated by the single-phase inverters in response to control by the control device, wherein the control device includes:
a basic gradational level calculator for calculating a basic gradational level of the output voltage of the plurality of single-phase
inverters based on a reference voltage,
a gradational level correction value calculator for calculating a gradational level correction value for correcting the basic
gradational level so that the output current of the plurality single-phase inverters follows the predefined output current,
a gradational output voltage level calculator for calculating a gradational output voltage level for the plurality of single-phase
inverters by correcting the basic gradational level using the gradational level correction value, and
an inverter control processor for outputting control signals to the plurality of single-phase inverters in accordance with
the gradational output voltage level.
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