Single phase inverters cooperatively controlled to provide one, two, or three phase unipolar electricity

摘要

Disclosed is a power converter unit (102) includes a direct current (”DC”) to DC converter (104). The DC to DC converter (104) comprises a positive input terminal (110), a negative input terminal (112), a first capacitor (522), a first coil (504), a first switch (506), a second switch (508), a second capacitor (536), a positive DC output terminal (116) and a negative DC output terminal (118). An input terminal of the first capacitor (522) is connected to the positive input terminal (110) and an output terminal of the first capacitor (522) is connected to the negative input terminal (112). An input terminal of the first coil (504) is connected to the input terminal of the first capacitor (522). An input terminal of the first switch (506) is connected to an output terminal of the first coil (504) and an output terminal of the first switch (506) is connected to the negative input terminal (112). An input terminal of the second switch (508) is connected to the output terminal of the first coil (504). An input terminal of the second capacitor (536) is connected to an output terminal of the second switch (508) and an output terminal of the second capacitor (536) is connected to the negative input terminal (112). The positive DC output terminal (116) is connected to the input terminal of the second capacitor (536) and the negative DC output terminal (118) is connected to the output terminal of the second capacitor (536). The power converter unit (102) also includes a unipolar power converter (106). The unipolar power converter (106) comprises a second coil (510), a third switch (512), a fourth switch (514), a third coil (516), a third capacitor (518) and a unipolar power output terminal (120). An input terminal of the second coil (510) is connected to the input terminal of the second capacitor (536). An input terminal of the third switch (512) is connected to an output terminal of the second coil (510). An input terminal of the fourth switch (514) is connected to the output terminal of the second capacitor (536) and an output terminal of the fourth switch (514) is connected to an output terminal of the third switch (512). An input terminal of the third coil (516) is connected to the output terminal of the third switch (512) and the output terminal of the fourth switch (514). An input terminal of the third capacitor (518) is connected to an output terminal of the third coil (516) and an output terminal of the third capacitor (518) is connected to the input terminal of the fourth switch (514). The unipolar power output terminal (120) is connected to the input terminal of the third capacitor (518). The power converter unit (102) also includes a controller (107) coupled to the first, second, third, and fourth switches (506, 508, 512, 514), wherein the controller (107) is configured to control the operation of each switch to generate a positive DC voltage at the positive DC output terminal (116), a negative DC voltage at the negative DC output terminal (118), and a unipolar power output at the unipolar power output terminal (120).