US3617840A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Synchronized inverter and pulse modulator
Assignee: Individual
•
Filing: 1970-11-27
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Granted: 1971-11-02
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Expires: 1990-11-27
Abstract
Abstract A synchronized controlled rectifier inverter and controlled rectifier pulse modulator system providing an AC output voltage when supplied a direct voltage input. The pulse modulator is connected between the inverter and a source of direct voltage to regulate the DC level supplied the inverter. In operation, controlled rectifiers in the pulse modulator are gated in synchronism with the gating of controlled rectifiers in the inverter. This synchronization is effected by an oscillator angle control and differentiator circuit which develops the necessary trigger signals.
Inventors
- 👤 Jalal T Salihi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 16:55
CPC Classifications
H; H02; H02P; H02P23/00; H02P23/08
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
296 words
A motor control system, comprising: a source of direct voltage, a controlled rectifier pulse modulator having an input and an output and including at least one controlled rectifier connected to transfer current between said input and output, means connecting the input of said pulse modulator with said source of direct voltage, a DC to AC controlled rectifier inverter, means connecting the input of said inverter with the output of said pulse modulator, an electric motor, means connecting said electric motor with the output of said inverter, a triggering means connected with the controlled rectifiers of said inverter for sequentially and periodically gating the controlled rectifiers conductive, a signal-generating means connected with said triggering means to initiate each application of a trigger signal to said inverter for controlling the output frequency of said inverter, an oscillator means connected with said signal generating means and controlled thereby to provide a periodic output initiated by a first pulse from said signal generating means and terminated by the subsequent pulse from said signal generating means, and a trigger pulse forming means connected with said oscillator means and with a controlled rectifier of said modulator to periodically gate that controlled rectifier conductive, said trigger pulse forming means including means for providing phase control of the application of said trigger pulses to said modulator within each cycle of the signal of said oscillator means to afford variable duty cycle operation of said modulator, said modulator providing a variable DC input voltage to said inverter according to the instantaneous duty cycle, said modulator being synchronized with said inverter in operation by the connection of said signal means with said triggering means whereby, the operation of said modulator at a predetermined output voltage level is substantially identical for each conductive interval of said inverter.
Claim 2
Dependent Claim
296 words
A motor control system, comprising: a source of direct voltage, a controlled rectifier pulse modulator having an input and an output and including at least one controlled rectifier connected to transfer current between said input and output, means connecting the input of said pulse modulator with said source of direct voltage, a DC to AC controlled rectifier inverter, means connecting the input of said inverter with the output of said pulse modulator, an electric motor, means connecting said electric motor with the output of said inverter, a triggering means connected with the controlled rectifiers of said inverter for sequentially and periodically gating the controlled rectifiers conductive, a signal-generating means connected with said triggering means to initiate each application of a trigger signal to said inverter for controlling the output frequency of said inverter, an oscillator means connected with said signal generating means and controlled thereby to provide a periodic output initiated by a first pulse from said signal generating means and terminated by the subsequent pulse from said signal generating means, and a trigger pulse forming means connected with said oscillator means and with a controlled rectifier of said modulator to periodically gate that controlled rectifier conductive, said trigger pulse forming means including means for providing phase control of the application of said trigger pulses to said modulator within each cycle of the signal of said oscillator means to afford variable duty cycle operation of said modulator, said modulator providing a variable DC input voltage to said inverter according to the instantaneous duty cycle, said modulator being synchronized with said inverter in operation by the connection of said signal means with said triggering means whereby, the operation of said modulator at a predetermined output voltage level is substantially identical for each conductive interval of said inverter.
Claim 3
Dependent Claim
348 words
A motor control system, comprising: a source of direct voltage, a controlled rectifier pulse modulator having an input and an output and including at least one controlled rectifier connected to transfer current between said input and output, means connecting the input of said pulse modulator with said source of direct voltage, a DC to AC controlled rectifier inverter, means connecting the input of said inverter with the output of said pulse modulator, an electric motor, means connecting said electric motor with the output of said inverter, a triggering means connected with the controlled rectifiers of said inverter for sequentially and periodically gating the controlled rectifiers conductive, a pulse source, time delay means connecting said pulse source with said triggering means to initiate the application of a trigger signal to said inverter a predetermined time after each pulse from said pulse source, an oscillator means connected with said pulse source and controlled thereby to provide a periodic output initiated by a first pulse from said pulse source and terminated by the subsequent pulse from said pulse source, a trigger pulse forming means connected with said oscillator means and with a controlled rectifier of said modulator to periodically gate that controlled rectifier conductive, and an enabling means connected with said time delay means and said trigger pulse forming means to ensure that no gate signal is applied to said controlled rectifier of said modulator for a predetermined time interval subsequent to the application of a gate signal to the controlled rectifiers of said inverter, said trigger pulse forming means providing phase control of the application of said trigger pulses to said modulator within each cycle of the signal of said oscillator means to afford variable duty cycle operation of said modulator, said modulator providing a variable DC input voltage to said inverter according to the instantaneous duty cycle, said modulator being synchronized with said inverter in operation by the cOnnection of said pulse source with said triggering means whereby, the operation of said modulator at a predetermined output voltage level is substantially identical for each conductive interval of said inverter.
Claim 4
Dependent Claim
348 words
A motor control system, comprising: a source of direct voltage, a controlled rectifier pulse modulator having an input and an output and including at least one controlled rectifier connected to transfer current between said input and output, means connecting the input of said pulse modulator with said source of direct voltage, a DC to AC controlled rectifier inverter, means connecting the input of said inverter with the output of said pulse modulator, an electric motor, means connecting said electric motor with the output of said inverter, a triggering means connected with the controlled rectifiers of said inverter for sequentially and periodically gating the controlled rectifiers conductive, a pulse source, time delay means connecting said pulse source with said triggering means to initiate the application of a trigger signal to said inverter a predetermined time after each pulse from said pulse source, an oscillator means connected with said pulse source and controlled thereby to provide a periodic output initiated by a first pulse from said pulse source and terminated by the subsequent pulse from said pulse source, a trigger pulse forming means connected with said oscillator means and with a controlled rectifier of said modulator to periodically gate that controlled rectifier conductive, and an enabling means connected with said time delay means and said trigger pulse forming means to ensure that no gate signal is applied to said controlled rectifier of said modulator for a predetermined time interval subsequent to the application of a gate signal to the controlled rectifiers of said inverter, said trigger pulse forming means providing phase control of the application of said trigger pulses to said modulator within each cycle of the signal of said oscillator means to afford variable duty cycle operation of said modulator, said modulator providing a variable DC input voltage to said inverter according to the instantaneous duty cycle, said modulator being synchronized with said inverter in operation by the cOnnection of said pulse source with said triggering means whereby, the operation of said modulator at a predetermined output voltage level is substantially identical for each conductive interval of said inverter.
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) | 1974-11-01 | 1975-05-03 | 1975-11-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-01 | 1979-05-03 | 1979-11-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-01 | 1983-05-03 | 1983-11-02 | $7700.00 | Window Closed / Lapsed |