Patent EP0330755A2 successfully refreshed from Google Patents.
EP0330755A2
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Active filter device
Assignee: Mitsubishi Electric Corp
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Filing: 1988-12-19
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Granted: —
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Expires: 2008-12-19
Abstract
Abstract In an active filter device, control deviation signal between current command value and feedback signal is inputted to a learning control circuit, and in the learning control circuit the control deviation signal having early phase with respect to the current command value by phase corresponding to delay time of feedback signal is added per one period and outputted as correction signal, and current correction command value by adding the correction signal to the current command value is inputted as current command value of the active filter.
Inventors
- 👤 Masatoshi Mitsubishi Denki K.K. Takeda
- 👤 Tomohiko Mitsubishi Denki K.K. Aritsuka
- 👤 Yoshitaka Mitsubishi Control Software Tachibana
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-29 13:35
CPC Classifications
H; H02; H02J; H02J3/00; H02J3/02; H02M; H02M7/00; H02M7/42; H02M7/44; H02M7/48; H02M7/53; H02M7/537; H02M7/5387; H02M7/53871; H02M7/53875
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
120 words
An active filter device wherein harmonic component of load current is made a current command value, and output current is controlled according to the current command value, said active filter comprising: a deviation arithmetic circuit for calculating deviation between the current command value and the output current; a memory circuit for storing output of said deviation arithmetic circuit corresponding to at least one period of the current command value; and a control circuit for reading the storage content of said memory circuit in the preceding by prescribed time and for controlling the output current of said active filter based on second command value as a result of adding the read content to the current command value inputted at that time.
Claim 2
Dependent Claim
120 words
An active filter device wherein harmonic component of load current is made a current command value, and output current is controlled according to the current command value, said active filter comprising: a deviation arithmetic circuit for calculating deviation between the current command value and the output current; a memory circuit for storing output of said deviation arithmetic circuit corresponding to at least one period of the current command value; and a control circuit for reading the storage content of said memory circuit in the preceding by prescribed time and for controlling the output current of said active filter based on second command value as a result of adding the read content to the current command value inputted at that time.
Claim 3
Dependent Claim
114 words
An active filter device as set forth in claim 1, wherein said memory circuit is composed of a plurality of memories corresponding to a plurality of times by equally dividing at least one period of the current command value, and said control circuit samples output of said deviation arithmetic circuit at the plurality of times and adds the sampled values to the content already stored in said memory corresponding to each time and stores the added values in sequence, and reads in sequence the content in the memory preceding by prescribed time and performs control based on second current command value as a result of adding the read value to the current command value.
Claim 4
Dependent Claim
41 words
An active filter device as set forth in claim 1, wherein the memory read preceding time is made less than the time corresponding to one period of said current command value by the action delay time of said active filter device.
References Cited (Backward Citations)
No citation records indexed.
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