US4607321A
Expired / Lapsed
US
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Inverter
Assignee: Mitsubishi Electric Corp
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Filing: 1985-10-17
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Granted: 1986-08-19
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Expires: 2005-10-17
Abstract
Abstract An inverter for use with a vehicular induction motor employs a modulation system in which the waveform of the carrier wave is adjusted so that the modulation wave is made into a constant DC signal.
Inventors
- 👤 Hideo Obi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 10:26
CPC Classifications
H; H02; H02M; H02M7/00; H02M7/42; H02M7/44; H02M7/48; H02M7/505; H02M7/515; H02M7/525; H02M7/527; H02P; H02P27/00; H02P27/04; H02P27/06; H02P27/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
115 words
A high frequency pulse width modulation inverter for generating an inverter output AC waveform having high frequency pulses, characterized in that a first carrier wave (14) for determining the frequency of said high frequency pulses is divided by a fundamental wave content factor of an output voltage to obtain a second carrier wave (15), said factor being unequivocally determined by the number of pulses occurring in a half cycle of said output of said inverter and the modulation rate of the output voltage, and said second carrier wave is compared with a modulation wave of a constant DC voltage corresponding to the modulation rate to generate a gate signal for an output voltage control element.
Claim 2
Dependent Claim
115 words
A high frequency pulse width modulation inverter for generating an inverter output AC waveform having high frequency pulses, characterized in that a first carrier wave (14) for determining the frequency of said high frequency pulses is divided by a fundamental wave content factor of an output voltage to obtain a second carrier wave (15), said factor being unequivocally determined by the number of pulses occurring in a half cycle of said output of said inverter and the modulation rate of the output voltage, and said second carrier wave is compared with a modulation wave of a constant DC voltage corresponding to the modulation rate to generate a gate signal for an output voltage control element.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-08-18 | 1990-02-17 | 1990-08-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-08-18 | 1994-02-17 | 1994-08-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-08-18 | 1998-02-17 | 1998-08-19 | $7700.00 | Window Closed / Lapsed |