IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0450471
(2012-04-19)
|
등록번호 |
US-8269450
(2012-09-18)
|
우선권정보 |
JP-2007-336294 (2007-12-27) |
발명자
/ 주소 |
- Higashikawa, Koji
- Yamada, Kenji
- Yamanaka, Katsutoshi
|
출원인 / 주소 |
- Kabushiki Kaisha Yaskawa Denki
|
대리인 / 주소 |
Ditthavong Mori & Steiner, P.C.
|
인용정보 |
피인용 횟수 :
2 인용 특허 :
15 |
초록
▼
A winding switching apparatus includes a winding switching device and a drive circuit. The winding switching device is configured to switch a plurality of windings of an AC motor. The drive circuit is configured to control the winding switching device. The winding switching device includes a winding
A winding switching apparatus includes a winding switching device and a drive circuit. The winding switching device is configured to switch a plurality of windings of an AC motor. The drive circuit is configured to control the winding switching device. The winding switching device includes a winding switch, a diode bridge, and a capacitor. The diode bridge includes a positive-side DC output terminal, a negative-side DC output terminal, and AC input terminals. The AC input terminals corresponds to respective phases of the AC motor. The positive-side and negative-side DC output terminals are respectively connected to positive-side and negative-side DC buses provided in an inverter. The AC input terminals are respectively connected to winding-switching terminals corresponding to the respective phases of the AC motor. The AC input terminals are respectively connected to phase terminals provided in the winding switch.
대표청구항
▼
1. A winding switching apparatus comprising: a winding switching device configured to switch a plurality of windings of an AC motor which is configured to be driven by an inverter to supply a variable voltage having a variable frequency;a drive circuit configured to control the winding switching dev
1. A winding switching apparatus comprising: a winding switching device configured to switch a plurality of windings of an AC motor which is configured to be driven by an inverter to supply a variable voltage having a variable frequency;a drive circuit configured to control the winding switching device; andthe winding switching device comprising: a winding switch configured to switch the plurality of windings based on a winding-switching signal from the drive circuit;a diode bridge including a positive-side DC output terminal, a negative-side DC output terminal, and AC input terminals, the AC input terminals corresponding to respective phases of the AC motor, the positive-side and negative-side DC output terminals being respectively connected to positive-side and negative-side DC buses provided in the inverter, the AC input terminals being respectively connected to winding-switching terminals corresponding to the respective phases of the AC motor, the AC input terminals being respectively connected to phase terminals provided in the winding switch; anda capacitor connecting the positive-side DC output terminal to the negative-side DC output terminal. 2. The winding switching apparatus according to claim 1, wherein the winding switch includes power semiconductor switches and diodes, the power semiconductor switches corresponding to the respective phases, the diodes being connected in inverse parallel to the respective power semiconductor switches,emitters of the respective power semiconductor switches are connected to each other, andcollectors of the respective power semiconductor switches are respectively connected to the AC input terminals of the diode bridge. 3. The winding switching apparatus according to claim 2, wherein the diode bridge includes a diode device and a protective diode device,the diode device includes diodes corresponding to the respective phases, cathodes provided in the respective diodes of the diode device being connected to each other, andthe protective diode device includes diodes corresponding to the respective phases, anodes provided in the respective diodes of the protective diode device being connected to each other, cathodes provided in the respective diodes of the protective diode device being respectively connected to the cathodes provided in the respective diodes of the diode device. 4. The winding switching apparatus according to claim 2, wherein the winding switching device includes a positive-side charging resistor and a negative-side charging resistor,the positive-side charging resistor includes a first end and a second end, the first end of the positive-side charging resistor being connected to the positive-side DC bus provided in the inverter, the second end of the positive-side charging resistor being connected to a positive side of the capacitor, andthe negative-side charging resistor including a first end and a second end, the first end of the negative-side charging resistor being connected to the negative-side DC bus provided in the inverter, the second end of the negative-side charging resistor being connected to a negative side of the capacitor. 5. The winding switching apparatus according to claim 2, further comprising: a plurality of state detectors each configured to detect a conducting state of the power semiconductor switches of the corresponding switching device; anda plurality of comparators each configured to detect an abnormality in the corresponding winding switching device on the basis of output signals from the corresponding state detector and a drive signal. 6. The winding switching apparatus according to claim 5, wherein the state detector is configured to detect that all the power semiconductor switches are in a conducting state or that all the power semiconductor switches are in a non-conducting state. 7. The winding switching apparatus according to claim 5, wherein the state detector has an insulating function. 8. The winding switching apparatus according to claim 5, wherein the comparator includes a plurality of logical exclusive OR circuits each configured to compare an output signal from the corresponding state detector with the drive signal to output a logical exclusive OR signal, and is configured to use the logical exclusive OR signals from the logical exclusive OR circuits to detect an abnormality in the corresponding winding switching device. 9. The winding switching apparatus according to claim 1, wherein the diode bridge includes a diode device and a protective diode device,the diode device includes diodes corresponding to the respective phases, cathodes provided in the respective diodes of the diode device being connected to each other, andthe protective diode device includes diodes corresponding to the respective phases, anodes provided in the respective diodes of the protective diode device being connected to each other, cathodes provided in the respective diodes of the protective diode device being respectively connected to the cathodes provided in the respective diodes of the diode device. 10. The winding switching apparatus according to claim 1, wherein the winding switching device includes a positive-side charging resistor and a negative-side charging resistor,the positive-side charging resistor includes a first end and a second end, the first end of the positive-side charging resistor being connected to the positive-side DC bus provided in the inverter, the second end of the positive-side charging resistor being connected to a positive side of the capacitor, andthe negative-side charging resistor including a first end and a second end, the first end of the negative-side charging resistor being connected to the negative-side DC bus provided in the inverter, the second end of the negative-side charging resistor being connected to a negative side of the capacitor. 11. The winding switching apparatus according to claim 1, further comprising: a plurality of state detectors each configured to detect a conducting state of the power semiconductor switches of the corresponding winding switch; anda plurality of comparators each configured to detect an abnormality in the corresponding winding switching device on the basis of output signals from the corresponding state detector and a drive signal. 12. The winding switching apparatus according to claim 11, wherein the state detector is configured to detect that all the power semiconductor switches are in a conducting state or that all the power semiconductor switches are in a non-conducting state. 13. The winding switching apparatus according to claim 11, wherein the state detector has an insulating function. 14. The winding switching apparatus according to claim 11, wherein the comparator includes a plurality of logical exclusive OR circuits each configured to compare an output signal from the corresponding state detector with the drive signal to output a logical exclusive OR signal, and is configured to use the logical exclusive OR signals from the logical exclusive OR circuits to detect an abnormality in the corresponding winding switching device. 15. A winding switching system comprising: an AC motor;an inverter to supply a variable voltage having a variable frequency;a winding switching device configured to switch a plurality of windings of the AC motor which is configured to be driven by the inverter;a drive circuit configured to control the winding switching device; andthe winding switching device comprising: a winding switch configured to switch the plurality of windings based on a winding-switching signal from the drive circuit;a diode bridge including a positive-side DC output terminal, a negative-side DC output terminal, and AC input terminals, the AC input terminals corresponding to respective phases of the AC motor, the positive-side and negative-side DC output terminals being respectively connected to positive-side and negative-side DC buses provided in the inverter, the AC input terminals being respectively connected to winding-switching terminals corresponding to the respective phases of the AC motor, the AC input terminals being respectively connected to phase terminals provided in the winding switch; anda capacitor connecting the positive-side DC output terminal to the negative-side DC output terminal. 16. The winding switching system according to claim 15, wherein the winding switch includes power semiconductor switches and diodes, the power semiconductor switches corresponding to the respective phases, the diodes being connected in inverse parallel to the respective power semiconductor switches,emitters of the respective power semiconductor switches are connected to each other, andcollectors of the respective power semiconductor switches are respectively connected to the AC input terminals of the diode bridge. 17. The winding switching system according to claim 15, wherein the diode bridge includes a diode device and a protective diode device,the diode device includes diodes corresponding to the respective phases, cathodes provided in the respective diodes of the diode device being connected to each other, andthe protective diode device includes diodes corresponding to the respective phases, anodes provided in the respective diodes of the protective diode device being connected to each other, cathodes provided in the respective diodes of the protective diode device being respectively connected to the cathodes provided in the respective diodes of the diode device. 18. The winding switching system according to claim 15, wherein the winding switching device includes a positive-side charging resistor and a negative-side charging resistor,the positive-side charging resistor includes a first end and a second end, the first end of the positive-side charging resistor being connected to the positive-side DC bus provided in the inverter, the second end of the positive-side charging resistor being connected to a positive side of the capacitor, andthe negative-side charging resistor including a first end and a second end, the first end of the negative-side charging resistor being connected to the negative-side DC bus provided in the inverter, the second end of the negative-side charging resistor being connected to a negative side of the capacitor. 19. The winding switching system according to claim 15, further comprising: a plurality of state detectors each configured to detect a conducting state of the power semiconductor switches of the corresponding winding switch; anda plurality of comparators each configured to detect an abnormality in the corresponding winding switching device on the basis of output signals from the corresponding state detector and a drive signal. 20. The winding switching system according to claim 19, wherein the state detector is configured to detect that all the power semiconductor switches are in a conducting state or that all the power semiconductor switches are in a non-conducting state.
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