US5400240A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Power converter apparatus
Assignee: Mitsubishi Electric Corp
•
Filing: 1993-03-03
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Granted: 1995-03-21
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Expires: 2013-03-03
Abstract
Abstract A power converter apparatus includes a control mechanism for sampling input signals at a sampling frequency and generating an alternating current control voltage in response and for generating a two-axis voltage command. A phase correcting mechanism operating at a second frequency higher than the sampling frequency is provided for correcting the phase of the control voltage at the second frequency. A coordinate converting mechanism converts the voltage command into a multi-phase voltage command in response to the phase of the voltage after the phase correction by the phase correcting mechanism.
Inventors
- 👤 Hiroshi Araki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 18:18
CPC Classifications
H; H02; H02P; H02P27/00; H02P27/04; G; G05; G05F; G05F1/00; G05F1/66
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
124 words
A power converter apparatus comprising: control means for sampling input signals at a sampling frequency and generating an alternating current control voltage having a phase θ and a two-axis voltage command in response to the sampling; phase correcting means operating at a second frequency higher than the sampling frequency for correcting the phase of the control voltage to θ+ω1/f k , where θ1 represents the frequency of the control voltage and f k represents the frequency of a carrier wave, at the second frequency to generate a corrected control voltage; and coordinate converting means connected to the phase correcting means and the control means for converting the two-axis voltage command into a multi-phase voltage command responsive to the phase of the corrected control voltage.
Claim 2
Dependent Claim
124 words
A power converter apparatus comprising: control means for sampling input signals at a sampling frequency and generating an alternating current control voltage having a phase θ and a two-axis voltage command in response to the sampling; phase correcting means operating at a second frequency higher than the sampling frequency for correcting the phase of the control voltage to θ+ω1/f k , where θ1 represents the frequency of the control voltage and f k represents the frequency of a carrier wave, at the second frequency to generate a corrected control voltage; and coordinate converting means connected to the phase correcting means and the control means for converting the two-axis voltage command into a multi-phase voltage command responsive to the phase of the corrected control voltage.
Claim 3
Dependent Claim
19 words
The converter apparatus according to claim 1 wherein the second frequency is the same as the carrier wave frequency.
Claim 4
Dependent Claim
169 words
A power converter apparatus comprising: a power converter for converting direct current into an alternating current in response to a multi-phase voltage command; an induction motor driven by the alternating current and having an angular velocity determined by the alternating current; a control mechanism sampling at least one of the angular velocity and the alternating current at a sampling frequency and generating an alternating current control voltage having a phase θ and a two-axis voltage command in response to the sampling; phase correcting means operating at a second frequency higher than the sampling frequency for correcting the phase of the control voltage to θ+ω1/f k , where θ1 represents the frequency of the control voltage and f k represents the frequency of a carrier wave, at the second frequency to generate a corrected control voltage; and coordinate converting means connected to the control mechanism and the phase correcting means for converting the voltage command into the multi-phase voltage command in response to the phase of the corrected control voltage.
Claim 5
Dependent Claim
169 words
A power converter apparatus comprising: a power converter for converting direct current into an alternating current in response to a multi-phase voltage command; an induction motor driven by the alternating current and having an angular velocity determined by the alternating current; a control mechanism sampling at least one of the angular velocity and the alternating current at a sampling frequency and generating an alternating current control voltage having a phase θ and a two-axis voltage command in response to the sampling; phase correcting means operating at a second frequency higher than the sampling frequency for correcting the phase of the control voltage to θ+ω1/f k , where θ1 represents the frequency of the control voltage and f k represents the frequency of a carrier wave, at the second frequency to generate a corrected control voltage; and coordinate converting means connected to the control mechanism and the phase correcting means for converting the voltage command into the multi-phase voltage command in response to the phase of the corrected control voltage.
Claim 6
Dependent Claim
48 words
The converter apparatus according to claim 3 wherein the power converter includes a modulation circuit operated at a switching frequency higher than the sampling frequency for controlling modulation of the direct current and wherein the phase correcting means corrects the phase of the voltage at the switching frequency.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1998-03-20 | 1998-09-19 | 1999-03-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-03-20 | 2002-09-19 | 2003-03-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-03-20 | 2006-09-19 | 2007-03-21 | $7700.00 | Window Closed / Lapsed |