Traveling wave tube heating coil power supply with varying frequency AC current limiting means
AssigneeANT Nachrichtentechnik GmbH
InventorFranz Ohms
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Abstract
A power supply for supplying the heating coils of a tube (WR), in particular a traveling-wave tube, wherein a transformer (Tr) and an inverter (S1, S2) are provided in the heating circuit of the tube (WR), and the frequency of the AC current is reduced from a high initial value to a lower value during the heat-up time of the tube (WR) in such a way that the change of the inductive voltage drop caused by this frequency change limits the heating current at the leakage inductance (LS) of the transformer (Tr).
Claims9
A power supply for supplying heating coils of a tube (WR), in particular a traveling-wave tube, with an AC current having a frequency, wherein a transformer (Tr) having a leakage inductance (LS) and an inverter (S1, S2) are provided in a heating circuit of the tube (WR), characterized in that the power supply comprises means for reducing the frequency of the AC current from a high initial value to a lower value only during a start-up phase of the tube (WR) in such a way that a change of an inductive voltage drop caused by this frequency change limits the AC current at the leakage inductance (LS) of the transformer (Tr), wherein said means for reducing the frequency comprise oscillator means for producing an output signal having a frequency with any one of a plurality of frequency values, and a timer connected to said oscillator means for changing the output signal frequency from one value to another as a function of time.
Dependencies are inferred from the claim text.