Patent US3383561A successfully refreshed from Google Patents.
US3383561A
Expired / Lapsed
US
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Pulse width modulation control system
Assignee: Allis Chalmers Corp
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Filing: 1966-04-04
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Granted: 1968-05-14
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Expires: 1986-04-04
Abstract
No abstract record available.
Inventors
- 👤 Tom N Thiecle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 15:00
CPC Classifications
H; H02; H02P; H02P7/00; H02P7/06; H02P7/18; H02P7/24; H02P7/28; H02P7/285; H02P7/29; H02P7/291
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
192 words
CURRENT LIMITING MEANS FOR A CONTROL SYSTEM THAT CYCLICALLY CONNECTS A DIRECT CURRENT SOURCE TO A DIRECT CURRENT MOTOR TO PROVIDE A VARIABLE AVERAGE CURRENT TO SAID MOTOR, SAID MEANS COMPRISING: POWER SWITCHING MEANS CONNECTED BETWEEN THE SOURCE AND THE MOTOR; PULSE MODULATION CONTROL MEANS FOR CONTROLLING THE POWER SWITCHING MEANS BY PROVIDING SELECTABLY VARIABLE PULSES DELIVERED TO TURN ON SAID POWER SWITCHING MEANS FOR THE DURATION OF THE PULSE; MEANS CONNECTED ACROSS THE POWER SWITCHING MEANS FOR PROVIDING A CONTINUOUS MEASURE OF THE VOLTAGE ACROSS SAID POWER SWITCHING MEANS; SENSING MEANS RESPONSIVE TO THE MEASURE OF THE VOLTAGE FOR PROVIDING AN OUTPUT SIGNAL WHEN THE INSTANTANEOUS LEVEL OF SAID VOLTAGE EXCEEDS A FIRST PRESELECTED LEVEL INDICATING AN INSTANTANEOUS OVERCURRENT CONDITION; MEANS CONNECTED TO THE SENSING MEANS AND RESPONSIVE TO THE VOLTAGE ACROSS THE SWITCHING MEANS FOR DEACTIVATING SAID SENSING MEANS WHEN THE VOLTAGE ACROSS THE SWITCHING MEANS IS ABOVE A SECOND PREDETERMINED LEVEL GREATER THAN THE FIRST PRESELECTED LEVEL AND SELECTED TO INDICATE THAT SAID SWITCHING MEANS IS OPEN; AND MEANS RESPONSIVE TO THE OUTPUT SIGNAL FOR CONTROLLING THE PULSE MODULATION CONTROL MEANS TO EFFECT INSTANTANEOUS TURN-OFF OF THE SWITCHING MEANS.
Claim 2
Dependent Claim
192 words
CURRENT LIMITING MEANS FOR A CONTROL SYSTEM THAT CYCLICALLY CONNECTS A DIRECT CURRENT SOURCE TO A DIRECT CURRENT MOTOR TO PROVIDE A VARIABLE AVERAGE CURRENT TO SAID MOTOR, SAID MEANS COMPRISING: POWER SWITCHING MEANS CONNECTED BETWEEN THE SOURCE AND THE MOTOR; PULSE MODULATION CONTROL MEANS FOR CONTROLLING THE POWER SWITCHING MEANS BY PROVIDING SELECTABLY VARIABLE PULSES DELIVERED TO TURN ON SAID POWER SWITCHING MEANS FOR THE DURATION OF THE PULSE; MEANS CONNECTED ACROSS THE POWER SWITCHING MEANS FOR PROVIDING A CONTINUOUS MEASURE OF THE VOLTAGE ACROSS SAID POWER SWITCHING MEANS; SENSING MEANS RESPONSIVE TO THE MEASURE OF THE VOLTAGE FOR PROVIDING AN OUTPUT SIGNAL WHEN THE INSTANTANEOUS LEVEL OF SAID VOLTAGE EXCEEDS A FIRST PRESELECTED LEVEL INDICATING AN INSTANTANEOUS OVERCURRENT CONDITION; MEANS CONNECTED TO THE SENSING MEANS AND RESPONSIVE TO THE VOLTAGE ACROSS THE SWITCHING MEANS FOR DEACTIVATING SAID SENSING MEANS WHEN THE VOLTAGE ACROSS THE SWITCHING MEANS IS ABOVE A SECOND PREDETERMINED LEVEL GREATER THAN THE FIRST PRESELECTED LEVEL AND SELECTED TO INDICATE THAT SAID SWITCHING MEANS IS OPEN; AND MEANS RESPONSIVE TO THE OUTPUT SIGNAL FOR CONTROLLING THE PULSE MODULATION CONTROL MEANS TO EFFECT INSTANTANEOUS TURN-OFF OF THE SWITCHING MEANS.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-05-14 | 1971-11-13 | 1972-05-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-05-14 | 1975-11-13 | 1976-05-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-05-14 | 1979-11-13 | 1980-05-14 | $7700.00 | Window Closed / Lapsed |