子分类：
| 序号 | 专利名 | 申请号 | 申请日 | 公开（公告）号 | 公开（公告）日 | 发明人 |
|---|---|---|---|---|---|---|
| 21 | Magnetic amplifier | US814263 | 1985-12-30 | US4675615A | 1987-06-23 | Donato Bramanti |
| A magnetic amplifier employing a single four-legged ferrite core having orthogonally disposed through holes in the core. Biasing is provided of the magnetic core so as to provide operation in the non-linear parts of the core's hysteresis cycle. A first coil on the ferromagnetic core has an AC excitation signal applied thereto and a second coil on the core is wound orthogonally to the first coil and is adapted to have an output signal derived therefrom. A control or input current in a third coil is used to unbalance the magnetic bridge formed by the four legs, so as to produce a mutual inductance different from zero between the first and second coil. The biasing may be provided by a fourth coil or by permanent magnet means. | ||||||
| 22 | P-Oxybenzoyl copolyesters comprising thiodiphenol components and having improved flexibility and solubility in organic solvents | US959275 | 1978-11-09 | US4219629A | 1980-08-26 | Roger S. Storm |
| A p-oxybenzoyl copolyester which is flexible and soluble in organic solvents has recurring moieties of the formulas ##STR1## wherein the carbonyl groups of (B) are meta or para to each other and the oxygen atoms of (C) are meta or para to the sulfur atom thereof. Also described are organic solvent solutions of the p-oxybenzoyl copolyesters, molded articles made thereof and flexible coatings of such copolyesters on substrates. | ||||||
| 23 | Linear magnetic amplifier | US3659216D | 1970-09-28 | US3659216A | 1972-04-25 | PUY ROBERT P DE |
| Disclosed is a 2 stage linear magnetic amplifier. The first stage includes a pair of saturable magnetic cores each having a control and a gate winding thereon. Excitation voltage is provided to respective first stage gate windings by an alternating voltage source. A DC control voltage is provided to energize the respective control windings via a synchronous switch to reset them in synchronism with the alternating voltage. The second stage includes a pair of saturable magnetic cores each having a control and a gate winding thereon. Respective second stage control windings are connected in series with respective first stage gate windings so that the output from the first stage gate windings provides reset for the second stage. The respective second stage gate windings are connected to the alternating source and the load.
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| 24 | Sensitive magnetic amplifier relay driver | US3579051D | 1969-10-22 | US3579051A | 1971-05-18 | OLSEN ROBERT M |
| Electronic circuit capable of responding to a low signal input including a preamp magnetic amplifier circuit receiving one or a plurality of input signals and conditioned to deliver an output signal upon overcoming a reference signal, a second magnetic amplifier circuit for receiving the output signal of the preamp and conditioned to operate as a switch or as a bistable circuit and thereafter trigger a transistor for operating a relay.
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| 25 | Electric welder that uses magnetic amplifier to supply firing signals for controlled rectifier | US3564333D | 1968-02-21 | US3564333A | 1971-02-16 | CRAMER DONALD W; BECKER EUGENE W; MEYER RICHARD E; REINERT OWEN E |
| The high frequency voltages, that are customarily used to help initiate the arcs of electric welders, tend to cause premature and erratic initiation of those arcs where those electric welders use silicon controlled rectifiers to control the amounts of power supplied to those arcs and use transistor-type firing circuits to control the firing angles of those silicon controlled rectifiers; because transistor-type firing circuits are sensitive to high frequency voltages. The present invention provides an electric welder which utilizes silicon controlled rectifiers to control the amounts of power supplied to arcs and yet avoids premature and erratic initiation of those arcs by using a magnetic amplifier to control the firing angles of those silicon controlled rectifiers. Also, the present invention keeps that electric welder from supplying undesirably high amounts of power to those arcs, during the initiation of those arcs, by biasing the magnetic core of that magnetic amplifier downwardly at the conclusion of each welding operation. In addition, the electric welder of the present invention has a one-turn winding, on the magnetic core of the magnetic amplifier thereof, through which all of the welding current flows; and that one-turn winding is part of a feedback circuit for that magnetic amplifier which enables that electric welder to vary the amounts of power supplied to an arc over the full range of firing angles of the silicon controlled rectifiers thereof by merely adjusting a single control of that magnetic amplifier.
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| 26 | Magnetic amplifier of the kind having a controllable shunt | US3497819D | 1966-04-21 | US3497819A | 1970-02-24 | MICHAELIS HORST |
| 27 | Magnetic film amplifier | US3491308D | 1967-02-17 | US3491308A | 1970-01-20 | KOERNER RALPH J; KOLK ANTHONY J JR; FULLER RICHARD H |
| 28 | Magnetic amplifier | US3469199D | 1966-11-03 | US3469199A | 1969-09-23 | KHAZEN ALEXANDR MOISEEVICH |
| 29 | Linear reactive voltage control networks | US43525265 | 1965-02-25 | US3373346A | 1968-03-12 | JOHANNESSEN PAUL R |
| 30 | Magnetic amplifier | US34597464 | 1964-02-19 | US3372345A | 1968-03-05 | FULLER HARRISON W |
| 31 | Trip circuit | US45687565 | 1965-05-18 | US3363149A | 1968-01-09 | DE LATEUR LOUIS A |
| 32 | Power control circuit | US9981061 | 1961-03-31 | US3233167A | 1966-02-01 | JACOB MARLOW; EVALDS EGILS H |
| 33 | Magnetic amplifier | US15617761 | 1961-11-30 | US3137823A | 1964-06-16 | ARMAND CIOCCIO; FRAZIER HERMAN M; GRANT ERNEST C; LEWIS HOWARD A |
| 34 | Magnetic amplifier circuit | US3916060 | 1960-06-27 | US3110857A | 1963-11-12 | LAFUZE DAVID L |
| 35 | Magnetic systems | US45572554 | 1954-09-13 | US3093817A | 1963-06-11 | RAJCHMAN JAN A; LO ARTHUR W |
| 36 | Transverse magnetic amplifier core construction | US49490455 | 1955-03-17 | US3019348A | 1962-01-30 | LIPKIN DANIEL M |
| 37 | Fail-safe protective circuit for a magnetic amplifier | US69143657 | 1957-10-21 | US3005933A | 1961-10-24 | CHRIST JOSEPH A |
| 38 | Magnetic amplifier without ringback | US51848855 | 1955-06-28 | US3001084A | 1961-09-19 | BONN THEODORE H |
| 39 | Electromechanical amplifier | US36510453 | 1953-06-30 | US2901555A | 1959-08-25 | FREDRIK KLINKHAMER JACOB; DER BURGT CORNELIS MARTINUS VA; MEYER CLUWEN JOHANNES |
| 40 | Forcible reversion of magnetic amplifiers | US52470555 | 1955-07-27 | US2792507A | 1957-05-14 | ECKERT JR JOHN PRESPER |
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