Magnetic firing circuit for thyristors |
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| 申请号 | US3626275D | 申请日 | 1969-07-08 | 公开(公告)号 | US3626275A | 公开(公告)日 | 1971-12-07 |
| 申请人 | SEIBU DENKI KOGYO KK; | 发明人 | HARADA KOSUKE; | ||||
| 摘要 | A novel control circuit for constant current applications. The circuit comprises a thyristor bridge which is fired by a magnetic amplifier. The DC output current of the thyristors flows through the feedback winding of the magnetic amplifier to cancel the effect of the input ampere-turns, and to keep the output current constant through the equal ampere-turns characteristic of the conventional saturable reactor. Because thyristors are used in the output stage, the new circuit can control a large amount of output power with a device of light weight and small size. The principle of the new circuit is also effectively applied to parallel operation of multithyristors, in which individual currents can be adjusted to various desired values. | ||||||
| 权利要求 | 1. A current-control system comprising: A. a magnetic amplifier comprising first input terminal means, second input terminal means, and output terminal means, said first input terminal means being adapted to receive a currentcontrol signal, B. a semiconductor controlled rectifier current-control means adapted to receive electrical power and to control said power for apPlication to a load by controlled firing of thyristor means therein, C. means for connecting the output terminal means of the magnetic amplifier to the semiconductor controlled rectifier current-control means for controlling the firing of said thyristor means therein, and D. means for feeding back from the power output of the semiconductor controlled rectifier current-control means a negative feedback signal indicative of the current level of said power output for application to the second input terminal means, whereby the power output of the semiconductor controlled rectifier current-control means is controlled to supply a current proportional to the control signal. 2. A system according to claim 1 wherein said magnetic amplifier includes means for adjusting the open-loop gain of the amplifier to a very large value. 3. A system according to claim 1 wherein said semiconductor controlled rectifier current control means comprises a plurality of separate current-control systems operated in parallel. |
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