초록 ▼

A polyphase rectifying apparatus is disclosed, which substantially solves the instability of the single-phase rectifiers without adding a special circuit element, thereby balancing the input voltages of the single-phase rectifiers. The polyphase rectifying apparatus, used in a two or more-phase syst

A polyphase rectifying apparatus is disclosed, which substantially solves the instability of the single-phase rectifiers without adding a special circuit element, thereby balancing the input voltages of the single-phase rectifiers. The polyphase rectifying apparatus, used in a two or more-phase system, comprises a single-phase rectifier assigned to each phase, and having first and second input terminals, wherein the single-phase rectifiers of each phase are star-connected and the first input terminal of each single-phase rectifier is connected to the corresponding phase and the second input terminals of each of the single-phase rectifiers are connected to each other; and a converter assigned to each phase, wherein the output from the single-phase rectifier of the relevant phase is input into the corresponding converter. The single-phase rectifiers for all the phases are controlled by a common control signal. Preferably, the converters of all the phases are also controlled by a common control signal.

대표청구항 ▼

1. A polyphase rectifying apparatus used in a two or more-phase system, comprising: a single-phase rectifier assigned to each phase, and having first and second input terminals, wherein the first input terminal of each single-phase rectifier is connected to the corresponding phase and the second

1. A polyphase rectifying apparatus used in a two or more-phase system, comprising: a single-phase rectifier assigned to each phase, and having first and second input terminals, wherein the first input terminal of each single-phase rectifier is connected to the corresponding phase and the second input terminals of each of the single-phase rectifiers are connected to each other; and a converter assigned to each phase, wherein the output from the single-phase rectifier of the relevant phase is input into the corresponding converter, wherein: the single-phase rectifiers for all the phases are controlled by a common control signal. 2. A polyphase rectifying apparatus as claimed in claim 1, wherein the second input terminal of each single-phase rectifier is connected to a neutral point. 3. A polyphase rectifying apparatus as claimed in claim 1, wherein each single-phase rectifier functions as a step-up chopper type active filter. 4. A polyphase rectifying apparatus as claimed in claim 1, wherein the converters of all the phases are controlled by a common control signal. 5. A polyphase rectifying apparatus as claimed in claim 2, wherein the converters of all the phases are controlled by a common control signal. 6. A polyphase rectifying apparatus as claimed in claim 3, wherein the converters of all the phases are controlled by a common control signal. 7. A polyphase rectifying apparatus as claimed in claim 1, wherein the common control signal is the output voltage from one of the single-phase rectifiers. 8. A polyphase rectifying apparatus as claimed in claim 1, wherein the common control signal is the maximum voltage among the output voltages from the single-phase rectifiers. 9. A polyphase rectifying apparatus as claimed in claim 1, wherein the common control signal is the minimum voltage among the output voltages from the single-phase rectifiers. 10. A polyphase rectifying apparatus as claimed in claim 1, wherein the common control signal is the average of the output voltages from the single-phase rectifiers. 11. A polyphase rectifying apparatus as claimed in claim 1, wherein the impedances of the single-phase rectifiers observed from the input are controlled by the common control signal. 12. A polyphase rectifying apparatus as claimed in claim 4, wherein the impedances of the converters observed from the input are controlled by the common control signal. 13. A polyphase rectifying apparatus as claimed in claim 5, wherein the impedances of the converters observed from the input are controlled by the common control signal. 14. A polyphase rectifying apparatus as claimed in claim 6, wherein the impedances of the converters observed from the input are controlled by the common control signal.