IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0304793
(2007-06-15)
|
등록번호 |
US-8421389
(2013-04-16)
|
우선권정보 |
DE-10 2006 027 716 (2006-06-15) |
국제출원번호 |
PCT/EP2007/055983
(2007-06-15)
|
§371/§102 date |
20100203
(20100203)
|
국제공개번호 |
WO2007/144431
(2007-12-21)
|
발명자
/ 주소 |
|
출원인 / 주소 |
|
대리인 / 주소 |
|
인용정보 |
피인용 횟수 :
0 인용 특허 :
9 |
초록
▼
The invention relates to converters (inverters, pulse or frequency converters) and to driving “magnetically active” operating means. According to one embodiment, a circuit arrangement for feeding the operating means in at least one first winding phase (S1), comprises a first branch (Z1) of a frequen
The invention relates to converters (inverters, pulse or frequency converters) and to driving “magnetically active” operating means. According to one embodiment, a circuit arrangement for feeding the operating means in at least one first winding phase (S1), comprises a first branch (Z1) of a frequency converter (WR1) adapted for and operable at a switching frequency of not higher than 5 kHz for outputting a main alternating current generated at said switching frequency and having a substantially lower operating frequency (f1) to a winding (L1). A second branch (z1) of another frequency converter (WR2) is adapted for and operable at a second switching frequency of more than 5 kHz for outputting a supplementary alternating current generated at said switching frequency to the same winding (L1). In the at least one winding (L1), the two alternating currents (iA(t); iB(t)) of the two branches (Z1, z1) are superimposed to form a sum current.
대표청구항
▼
1. A circuit arrangement for feeding a magnetically active and electrically operable operating means having a winding, the circuit arrangement, in at least one first phase, comprises: (a) a first branch of a frequency converter adapted for and operable at a first switching frequency of not higher th
1. A circuit arrangement for feeding a magnetically active and electrically operable operating means having a winding, the circuit arrangement, in at least one first phase, comprises: (a) a first branch of a frequency converter adapted for and operable at a first switching frequency of not higher than 5 kHz for outputting a main alternating current generated at said first switching frequency and having a substantially lower operating frequency to the winding of the magnetically active and electrically operable operating means;(b) a second branch of another frequency converter adapted for and operable at a second switching frequency of more than 5 kHz for outputting a supplementary alternating current generated at said second switching frequency to the winding;wherein, in the winding of the operating means, the two alternating currents of the first and second branches are superimposed to form a sum current during parallel operation of the first and second branches of the two non-identical converters for at least the first winding phase of the circuit arrangement. 2. The circuit arrangement according to claim 1a, wherein at least one further phase of the circuit arrangement according to claim 1 configured to feed a second winding of the electrical operating means. 3. The circuit arrangement according to claim 2, wherein a winding phase of the circuit arrangement composed of two branches of non-identical converters is provided for feeding a third winding of the electrical operating means, in particular, the machine, with a third superimposed alternating current. 4. The circuit arrangement according to claim 2, wherein the first branch comprises three first branches being associated with a first three phase frequency converter configured to operate below no more than 5 kHz and a driving circuit thereof configured for operation below that frequency only. 5. The circuit arrangement according to claim 2, wherein three second branches are provided and are associated with a second three phase frequency converter configured for operation above 5 kHz and a driving circuit thereof configured for operation above the same frequency threshold. 6. The circuit arrangement according to claim 1, wherein the first and second branches each comprise at least two switching power semiconductors that are connected in series is fed by an intermediate circuit for outputting the alternating current, which may be generated by the switching, at their junction. 7. The circuit arrangement according to claim 1, wherein, in the phase, each branch operates via a respective associated output winding of an inductor associated with the phase on the respective winding of the operating means. 8. The circuit arrangement according to claim 1, wherein the switching frequencies of the two branches differ from each other by more than a factor of 2. 9. The circuit arrangement according to claim 8, wherein the switching frequencies have a relationship of 2n, wherein “n” is an integer greater than one. 10. The circuit arrangement according to claim 8, wherein the switching frequencies of the two branches differ from each other by a factor between 7 and 9. 11. The circuit arrangement according to claim 1, wherein the magnetically active and electrically operable operating means is an electrically operated machine driven by the circuit arrangement has a nominal power of more than 10 kW, or wherein the circuit arrangement is configured to operate the machine at a nominal power of more than 10 kW. 12. The circuit arrangement according to claim 11, wherein the nominal power is greater than 30 kW. 13. The circuit arrangement according to claim 1, wherein the first branch is not operable above an upper frequency limit of 4 kHz. 14. The circuit of claim 13, wherein the upper frequency limit is 3 kHz. 15. The circuit of claim 13, wherein the upper frequency limit is 2 kHz. 16. The circuit arrangement according to claim 1, wherein the second branch is operable above a lower frequency limit of 10 kHz. 17. The circuit of claim 16, wherein the lower frequency limit is one of 15 kHz and 16 kHz. 18. The circuit arrangement according to claim 1, wherein the second branch operable at the second switching frequency is configured for supplementing a ripple generated in a current of the first branch configured to operate at the first switching frequency to form a sum current output an actual value of the alternating current with a smoother profile. 19. The circuit arrangement according to claim 18, wherein the sum current output comprises an effective current ripple in the range of the frequency of the branch operating at the second switching frequency. 20. The circuit arrangement according to claim 1, wherein a pulse pattern for driving the second branch is adjusted such that a generated current ripple of current output by the first branch is substantially compensated for. 21. The circuit arrangement according to claim 1, wherein the switching frequencies of the two branches differ from each other substantially by a factor of 2. 22. The circuit arrangement according to claim 1, wherein an inductor comprises two windings magnetically coupled in the same direction and connected to each other in an electrically conducting manner for superimposing the main and supplementary alternating currents so that the sum current can be output as a superimposed current at the junction of the magnetically coupled windings. 23. The circuit arrangement according to claim 1, wherein the main and supplementary alternating currents are fed to an inductor having a tap outputting a sum current for the winding of the operating means. 24. The circuit arrangement of claim 1, the operating means being an electrically operated machine having at least one rotor or stator winding. 25. A method for operating a circuit arrangement for feeding an electrically operated operating means having at least one winding the circuit arrangement, in at least one first phase comprising: (a) a first branch of a frequency converter adapted for and operable at switching frequencies of not higher than 5 kHz, wherein a main alternating current generated at said switching frequencies is output to the at least one winding;(b) a second branch of another frequency converter operable at other switching frequencies of more than 5 kHz, a supplementary alternating current generated at said other switching frequencies is output to the same winding;wherein, in the at least one winding of the electrically operated operating means, the two alternating currents of the two branches are superimposed during parallel operation of the first and second branches of the two non-identical frequency converters for at least the first phase of the circuit arrangement. 26. The method according to claim 25, wherein a lower threshold frequency of the first branch, on average over a full 360° interval of the main alternating current is ten times greater than the nominal frequency of the main alternating current. 27. The method according to claim 25, wherein the lower switching frequency of the second branch, on average over a full 360° interval of the main alternating current, is above 10 kHz. 28. The method of claim 25, the operating means being a machine having at least one rotor or stator winding. 29. A circuit arrangement for feeding a magnetically active and electrically operable operating means having a winding and including a driving arrangement, the circuit arrangement, in at least one first phase, comprises: (a) a first branch of a first frequency converter operable at first switching frequencies of not higher than 5 kHz for outputting a main alternating current generated at said first switching frequencies and having a substantially lower operating frequency to the winding of the magnetically active operating means;(b) a second branch of a second frequency converter adapted for and operable at higher switching frequencies of more than 5 kHz for outputting a supplementary alternating current generated at said higher switching frequencies to the same winding;for superimposing, in the winding of the operating means, the two alternating currents to form a sum current during parallel operation of the first and second branches of the two non-identical first and second frequency converters for at least the first phase of the circuit arrangement,and wherein said driving arrangement comprises:(c) at least one first current regulator for the supplementary alternating current for regulating or controlling the sum current in the first phase and wherein the first current regulator is provided with a difference between a set current value of the first phase and a measured current of an output of the first branch. 30. The circuit arrangement according to claim 29, wherein at least one further phase is configured to feed a second winding of the electrical operating means. 31. The circuit arrangement according to claim 29, configured to drive an electrically operated machine having at least one rotor or stator winding. 32. The circuit arrangement according to claim 29, wherein a further regulator is provided for the main alternating current and the further regulator for controlling the main alternating current generated at the first switching frequencies is supplied with the set current value of the winding phase so that at least two current regulators are provided;and wherein each one of the two current regulators individually controls or regulates an output current at the branch associated therewith. 33. The circuit arrangement according to claim 32, wherein the main and supplementing currents are controlled or regulated by the two current regulators, and are supplied as the sum current to an output of the phase via an inductor having a tap. 34. A method for operating a circuit arrangement for feeding an electrically operated operating means having at least one winding, which circuit arrangement comprises a driving arrangement and comprises in at least one first phase: (a) a first branch of a first frequency converter operable at switching frequencies of not higher than 5 kHz, wherein a main alternating current generated at said switching frequencies is output to the at least one winding;(b) a second branch of another frequency converter operable at other switching frequencies of more than 5 kHz, wherein a supplementary alternating current generated at said other switching frequencies is output to the same winding;(c) wherein a current regulator for the supplementing current generated at the other switching frequency is provided for regulating or controlling a sum current receives a difference between a set current value of the first phase and a measured current at an output of the first branch;wherein, in the winding of the electrically operated operating means, the two alternating currents of the two branches are superimposed during parallel operation of the first and second branches. 35. The method according to claim 34, wherein an upper switching frequency of the first branch is at least ten times greater than a nominal frequency of the generated main alternating current. 36. The method according to claim 34, wherein the winding is a rotor or stator winding of a machine.
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