EP0130484A2
Expired / Lapsed
EP
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Inverter apparatus
Assignee: Hitachi Ltd
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Filing: 1984-06-20
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Granted: —
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Expires: 2004-06-20
Abstract
Abstract @ This invention relates to an inverter comprising a frequency converter (2) for converting DC power to AC power, an oscillation control circuit (19) for stepwise generating a command value concerning the conversion condition of the frequency converter, and operation control means (13, 14) which, when the command value from the oscillation control circuit changes, controls the oscillation control circuit (19) to repetitively generate a plurality of times alternate new and old command values before and after change of command value. Particularly, this invention is to provide an inverter capable of continuing smooth operation even when the control system has a limited resolution.
Inventors
- 👤 Shigeru Murasaki
- 👤 Motonobu Hattori
- 👤 Akira Ishibashi
- 👤 Kenji Nandoh
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-29 11:17
CPC Classifications
H; H02; H02M; H02M7/00; H02M7/42; H02M7/44; H02M7/48; H02M7/53; H02M7/537; H02M7/5387; H02M7/53871; H02M7/53873
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
77 words
An inverter apparatus comprising: a frequency converter (2) for converting DC power to AC power; an oscillation control circuit (19) for generating stepwise a command value concerning a conversion condition for said frequency converter; and operation control means for controlling said oscillation control circuit to repetitively produce a plurality of times alternate new and old command values before and after the change of the command value when the command value from said oscillation control circuit is changed.
Claim 2
Dependent Claim
77 words
An inverter apparatus comprising: a frequency converter (2) for converting DC power to AC power; an oscillation control circuit (19) for generating stepwise a command value concerning a conversion condition for said frequency converter; and operation control means for controlling said oscillation control circuit to repetitively produce a plurality of times alternate new and old command values before and after the change of the command value when the command value from said oscillation control circuit is changed.
Claim 3
Dependent Claim
42 words
An inverter apparatus according to claim 1, wherein said operation control means repetitively controls said oscillation control circuit (19) upon change of the command value from said oscillation control circuit, corresponding to the minimum value of the resolution of said frequency converter.
Claim 4
Dependent Claim
22 words
An inverter apparatus according to claim 2, wherein said operation control means (13) has memory means (14) for storing old command value.
Claim 5
Dependent Claim
35 words
An inverter apparatus according to claim 2, wherein said operation control means (13) has memory means (14) for storing the changed state of command value and a circuit for repeating new and old command values.
Claim 6
Dependent Claim
44 words
An inverter apparatus according to claim 1, wherein said operation control means controls the period during which the command value after change is produced, to be gradually made longer than the command value before change as the new and old command values are repeated.
Claim 7
Dependent Claim
57 words
An inverter apparatus according to claim 1, wherein said oscillation control circuit produces stepwise the command values concerning the output frequency and output voltage from said frequency converter and said operation control means repetitively controls said oscillation control circuit when the command value is changed for the output frequency and output voltage from said oscillation control circuit.
Claim 8
Dependent Claim
51 words
An inverter apparatus according to claim 1, wherein said oscillation control circuit generates stepwise the command value concerning the output frequency from said frequency converter, and said operation control means repetitively controls said oscillation control circuit when the command value is changed for the output frequency from said oscillation control circuit.
Claim 9
Dependent Claim
47 words
An inverter apparatus according to claim 6 or 7, wherein said operation control means repetitively controls said oscillation control circuit when the command value to said oscillation control circuit, which correspons to the minimum value of the resolution of a control system, is determined to be changed.
References Cited (Backward Citations)
No citation records indexed.
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