US5063532A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Active filter device
Assignee: Mitsubishi Electric Corp
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Filing: 1988-12-16
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Granted: 1991-11-05
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Expires: 2008-12-16
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 the feedback signal is added per one period and outputted as a correction signal, and a current correction command value determined by adding the correction signal to the current command value is inputted as a current command value of the active filter.
Inventors
- 👤 Masatoshi Takeda
- 👤 Tomohiko Aritsuka
- 👤 Yoshitaka Tachibana
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 03:43
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
174 words
An active filter device, comprising: an active filter circuit for generating an output current as a function of a current command value; a harmonic current generating load for generating a harmonic current in response to said output current; first deviation calculation means for calculating a deviation between said output current and said harmonic current and outputting the result as a deviation value; a control circuit, comprising a first memory for storing a deviation value delayed by a prescribed amount of time and a second memory for storing a deviation value corresponding to a previous period of said harmonic current, and a first arithmetic circuit for combining the delayed and previous deviation values to produce a compensation value and storing the compensation value in said second memory as said previous deviation value; a second arithmetic circuit for adding said compensation value to said harmonic current to produce a compensated harmonic current; and second deviation calculation means for calculating a deviation between said output current and said compensated harmonic current to produce said current command value.
Claim 2
Dependent Claim
174 words
An active filter device, comprising: an active filter circuit for generating an output current as a function of a current command value; a harmonic current generating load for generating a harmonic current in response to said output current; first deviation calculation means for calculating a deviation between said output current and said harmonic current and outputting the result as a deviation value; a control circuit, comprising a first memory for storing a deviation value delayed by a prescribed amount of time and a second memory for storing a deviation value corresponding to a previous period of said harmonic current, and a first arithmetic circuit for combining the delayed and previous deviation values to produce a compensation value and storing the compensation value in said second memory as said previous deviation value; a second arithmetic circuit for adding said compensation value to said harmonic current to produce a compensated harmonic current; and second deviation calculation means for calculating a deviation between said output current and said compensated harmonic current to produce said current command value.
Claim 3
Dependent Claim
36 words
An active filter device according to claim 1, wherein said prescribed amount of time is equal to the difference between a period of said harmonic current and an action delay time of said active filter device.
Claim 4
Dependent Claim
16 words
An active filter device according to claim 2 wherein said active filter comprises a PWM circuit.
References Cited (Backward Citations)
US4626769A
Cited
US4823251A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-11-04 | 1995-05-06 | 1995-11-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-11-04 | 1999-05-06 | 1999-11-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-11-04 | 2003-05-06 | 2003-11-05 | $7700.00 | Window Closed / Lapsed |