US3792340A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of and apparatus for controlling the performance of a d.c. magnetohydrodynamic generator
Assignee: Individual
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Filing: 1972-09-27
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Granted: 1974-02-12
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Expires: 1992-09-27
Abstract
Abstract The present invention relates to a method of and an apparatus for controlling the performance of a D.C. magnetohydrodynamic (MHD) generator. The invention consists in that the performance of the MHDgenerator is controlled by means of maintaining the preset value of its electrical load factor, to which end said apparatus performs in succession three functions: SHAPES A CONTROL SIGNAL TO PERIODICALLY VARY VOLTAGES ACROSS THE ELECTRODES OF THE MHD-generator in a discrete manner, DETERMINES CHANGES OF THE MDH-generator active power within every time interval equal to the cycle of discrete variations of voltages across the electrodes and SHAPES A CONTROL SIGNAL ACCORDING TO THE ACTIVE POWER CHANGE WITHIN SAID TIME INTERVAL TO VARY VOLTAGES ACROSS THE ELECTRODES OF THE MDH-generator so as to maintain the preset electrical load factor.
Inventors
- 👤 V Sheinkman
- 👤 S Pischikov
- 👤 B Sergeenkov
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 20:34
CPC Classifications
H; H02; H02K; H02K44/00; H02K44/08; H02K44/085
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
100 words
A method of controlling the performance of a D.C. magnetohydrodynamic (MHD) generator by varying voltages across the electrodes of the latter, said method comprising the steps of presetting a required value of the MHD-generator electrical load factor, generating control signals to periodically vary voltages across said electrodes in a discrete manner, monitoring the change of the MHD-generator active power for every time interval equal to the period of the discrete voltage variations across the electrodes, and shaping the generated control signals so as to maintain the preset electrical load factor in response to a monitored change of generator active power.
Claim 2
Independent Claim
100 words
A method of controlling the performance of a D.C. magnetohydrodynamic (MHD) generator by varying voltages across the electrodes of the latter, said method comprising the steps of presetting a required value of the MHD-generator electrical load factor, generating control signals to periodically vary voltages across said electrodes in a discrete manner, monitoring the change of the MHD-generator active power for every time interval equal to the period of the discrete voltage variations across the electrodes, and shaping the generated control signals so as to maintain the preset electrical load factor in response to a monitored change of generator active power.
Claim 3
Dependent Claim
118 words
A method of controlling the performance of a D.C. MHD-generator connected to an A.C. mains as claimed in claim 1, wherein the control signals to periodically vary voltages across the electrodes of the MHD-generator in a discrete manner is shaped at a frequency which is twice as low as that of the A.C. mains, while the change of the active power during every time interval equal to two cycles of the A.C. mains voltage is monitored by means of converting the integral of the active power within the cycle of the A.C. mains voltage into a power pulse proportional to this integral and equal to the difference between two successive pulses following each other and constituting a pair.
Claim 4
Dependent Claim
169 words
A controller for adjusting the performance of a D.C. MHD-generator, coupled with an A.C. mains via a controllable converter comprising: a means for adjusting voltages across the electrodes of the MHD-generator; a unit for shaping control signals to periodically vary voltages across the electrodes of the MHD-generator in a discrete manner, the output of the unit being coupled with the control input of said converter; an active power sensor facing said A.C. mains; a unit for the periodic and proportional converting of active power integrals into power pulses the input of which is coupled with the output of said active power sensor; a unit for determining the difference between two successive power pulses the input of which is coupled with the output of said unit for the periodic and proportional converting of active power integrals into power pulses, while the output of which is coupled with the input of said unit for shaping control signals to periodically vary voltages across the electrodes of the MHD-generator in a discrete manner.
Claim 5
Dependent Claim
169 words
A controller for adjusting the performance of a D.C. MHD-generator, coupled with an A.C. mains via a controllable converter comprising: a means for adjusting voltages across the electrodes of the MHD-generator; a unit for shaping control signals to periodically vary voltages across the electrodes of the MHD-generator in a discrete manner, the output of the unit being coupled with the control input of said converter; an active power sensor facing said A.C. mains; a unit for the periodic and proportional converting of active power integrals into power pulses the input of which is coupled with the output of said active power sensor; a unit for determining the difference between two successive power pulses the input of which is coupled with the output of said unit for the periodic and proportional converting of active power integrals into power pulses, while the output of which is coupled with the input of said unit for shaping control signals to periodically vary voltages across the electrodes of the MHD-generator in a discrete manner.
Claim 6
Dependent Claim
63 words
A controller for adjusting the performance of a D.C. MHD-generator as claimed in claim 3, wherein said unit for shaping control signals to periodically vary voltages across the electrodes of the MHD-generator in a discrete manner is made as a switch using two thyristors and a switching capacitor delivering output singals, the input signals being fed to the control electrodes of the thyristors.
Claim 7
Dependent Claim
73 words
A controller for adjusting the performance of a D.C. MHD-generator as claimed in claim 3 wherein said unit for the periodic and proportional converting of active power integrals into power pulses uses a transistor operating in the key mode that is connected in-series with a linear choke and contains a network of a capacitor and a diode connected in series, the network being connected between the emitter and the collector of said transistor.
Claim 8
Dependent Claim
73 words
A controller for adjusting the performance of a D.C. MHD-generator as claimed in claim 3 wherein said unit for determining the difference between two successive power pulses comprises: two capacitors serving to compare said power pulses; a transistor serving as a discharge network for one of the capacitors; a diode combined with said transistor to form a disCharge network of the second capacitor; and another transistor ensuring the discharge of the second 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) | 1977-02-11 | 1977-08-13 | 1978-02-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-11 | 1981-08-13 | 1982-02-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-11 | 1985-08-13 | 1986-02-12 | $7700.00 | Window Closed / Lapsed |