Multi-grid electron tube high frequency power oscillator
AssigneeU.S. Philips Corporation
InventorChristian S. A. E. Patron
Life of this patent
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Abstract
A high-frequency power oscillator includes a tetrode electron tube (5), a current source (3) and a voltage-limiting circuit (4). The current source (3) is connected to the screen grid of the tetrode (5). This limits the screen grid current when the voltage on the anode of the tetrode (5) is momentarily lower than the screen grid voltage. Between the screen grid and the cathode of the tetrode the voltage-limiting circuit (4) is inserted. This circuit starts to conduct above a predetermined threshold value. This forms a limit to the screen grid voltage so that is is possible to operate the tetrode (5) in a pulsating manner. The voltage-limiting circuit may comprise a triode (4) with a voltage source (2) providing a constant voltage between the grid and the cathode of the triode (4).
Claims7
A high-frequency power oscillator comprising;
- a multi-grid electron tube which includes at least a control grid, a screen grid and a cathode, a constant current source connected to the screen grid, a voltage-limiting circuit having one terminal connected to the screen grid and another terminal connected to the cathode of the electron tube, said voltage-limiting circuit having a low impedance for a voltage difference between the two said terminals above a preset threshold value and a high impedance for a voltage difference below said threshold value.
Dependencies are inferred from the claim text.