US4403280A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Commutation control device for current type inverters
Assignee: Toshiba Corp
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Filing: 1982-05-04
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Granted: 1983-09-06
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Expires: 2002-05-04
Abstract
Abstract In a commutation control device for a current type inverter, a device for detecting voltage of a commutation capacitor and a device for controlling a charging interval of the capacitor are provided. The voltage detecting device includes a comparator, while the charging interval control device includes a timing pulse generator, a circuit for delaying a pulse delivered from a pulse generator, and a timing signal generator which delivers a timing signal adapted to control a discharge interval of the commutation capacitor for restricting the voltage thereof in a predetermined range.
Inventors
- 👤 Chihiro Okado
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 22:15
CPC Classifications
H; H02; H02M; H02M7/00; H02M7/42; H02M7/44; H02M7/48; H02M7/505; H02M7/515; H02M7/5152
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
86 words
In a commutation control device for a current type inverter of the type wherein commutation energy of a load of the inverter is stored in a capacitor, and subsequent commutation is effected utilizing discharge of said capacitor, the improvement comprising means for detecting a voltage across said capacitor when it is charged and means for controlling a length of discharge interval of said capacitor during said subsequent commutation depending on the detected capacitor voltage so as to maintain the capacitor voltage at a substantially constant value.
Claim 2
Dependent Claim
86 words
In a commutation control device for a current type inverter of the type wherein commutation energy of a load of the inverter is stored in a capacitor, and subsequent commutation is effected utilizing discharge of said capacitor, the improvement comprising means for detecting a voltage across said capacitor when it is charged and means for controlling a length of discharge interval of said capacitor during said subsequent commutation depending on the detected capacitor voltage so as to maintain the capacitor voltage at a substantially constant value.
Claim 3
Dependent Claim
63 words
A commutation control device as set forth in claim 1 wherein said means for detecting the capacitor voltage includes a comparator for comparing the detected capacitor voltage with a predetermined value, the delivering a first output when the detected capacitor voltage is larger than the predetermined value, while delivering a second output when the detected capacitor voltage is less than the predetermined value.
Claim 4
Dependent Claim
31 words
A commutation control device as set forth in claim 1 wherein said means for detecting the capacitor voltage includes a comparator which delivers an output substantially proportional to the capacitor voltage.
Claim 5
Dependent Claim
93 words
A commutation control device as set forth in claim 2 wherein said means for controlling the discharge interval includes a pulse generator, a variable delay circuit for delaying a pulse received from said pulse generator depending on an output of said comparator, a fixed delay circuit for delaying a pulse received from said pulse generator for a fixed delay time, and a timing pulse generator connected to receive outputs of said variable delay circuit and said fixed delay circuit for generating a timing pulse utilized to control in discharge interval of said capacitor.
Claim 6
Dependent Claim
110 words
A commutation control device as set forth in claim 2 wherein said means for controlling the discharge interval includes a pulse generator, a plurality of fixed delay circuits for delaying pulses received from said pulse generator for different delay times, a transfer switch for delivering either one of outputs from said plurality of fixed delay circuits to a timing pulse generator, a further fixed delay circuit for delaying a pulse received from said pulse generator for a fixed delay time, said timing pulse generator being connected to receive an output from said further fixed delay circuit for generating a timing signal adapted to control the discharge interval of the capacitor.
Claim 7
Dependent Claim
89 words
A commutation control device as set forth in claim 3 wherein said means for controlling the discharge interval includes a pulse generator, a variable delay circuit for delaying a pulse received from said pulse generator for a delay time variable in accordance with the output of said comparator in said voltage detecting means, and a timing pulse generator connected to receive a pulse from said pulse generator and an output pulse from said variable delay circuit for generating a timing signal for controlling the discharge interval of the capacitor.
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) | 1986-09-05 | 1987-03-07 | 1987-09-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-09-05 | 1991-03-07 | 1991-09-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-09-05 | 1995-03-07 | 1995-09-06 | $7700.00 | Window Closed / Lapsed |