Beam current limiting circuit专利检索-钳位二极管二极管电子零件及设备专利检索查询-专利查询网

Beam current limiting circuit

阅读：699发布：2023-05-06

专利汇可以提供Beam current limiting circuit专利检索，专利查询，专利分析的服务。并且A circuit for limiting the current supplied to the cathode of a grid controlled electron beam gun welder. When the current attempts to rise above a predetermined level because of a change of bias voltage, the voltage drop across a sensing resistor approaches that of a zener diode which clamps the base voltage of a transistor in the cathode circuit causing the transistor to shut off sufficiently to limit the current to the maximum set point level. An inductor in the cathode circuit also tends to limit beam current for a short duration change of bias voltage. Several circuits are connected in series.，下面是Beam current limiting circuit专利的具体信息内容。

权利要求

1. In an electron beam device having a high voltage supply, a bias voltage supply connected between the grid and the high voltage supply, a self-biasing resistor connected in the cathode circuit, and an operating characteristic whereby a decrease in bias voltage results in an increase in the electron beam current, a circuit for providing bias when transients cause loss of the bias voltage supply comprising a transistor in the cathode circuit having a collector connected to the cathode, a zener diode connected between the high voltage supply and the base of the transistor, an impedance connected between the high voltage supply and the emitter of the transistor, the value of said impedance being selected to provide a voltage drop across the impedance within a range of normal operating currents which is much less than the conduction voltage of the zener diode, and a first resistor connected between the base and the collector of the transistor.

2. A circuit according to claim 1 in which the value of the first resistor is selected so that the transistor is fully on within a range of normal operating curreNts.

3. A circuit according to claim 1 in which said impedance includes a second resistor, an inductor connected in parallel with the second resistor and a third resistor connected in series with the second resistor and the inductor, said second resistor, said third resistor and said inductor each having values selected whereby a tendency for a sudden increase in operating current will tend to turn the transistor off.

说明书全文

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Beam current limiting circuit

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