JPH04249035A - Power supply for traveling wave tube - Google Patents

Abstract

PURPOSE:To enhance the reliance upon the performance of a traveling wave tube by using a power supply therefore which is equipped with a sequence control circuit, and conducting sequence control for the rising and falling of the output voltage. CONSTITUTION:Through a cathode current, sensing circuit 4 a sequence control circuit 5 distinguishes that the cathode current is the cut-off state, and emits a start signal for the power supply 2 for a helix collector electrode. Also through a cathode voltage sensing circuit 3, the control circuit 5 distinguishes that the helix collector voltage has risen, and gives instruction to start the power supply 1 for anode electrode. This sequential control suppresses turbulence in the beam of a traveling wave tube, and no eddy current shall necessarily flow to the helix. When the supply voltage is to fall, the control circuit 5 distinguishes with the aid of the cathode current sensing circuit 4 that the traveling wave tube is the On state, and emits a stop signal for the power supply 1. Then the control circuit 5 checks from the output signal of the cathode current sensing circuit 4 that the beam current is in Off state, and gives a command to stop the power supply 2. This allows suppressing turbulence in the beam current.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power supply circuit for traveling wave tubes, and more particularly to a power supply circuit for use in traveling wave tube amplifiers.

0002

[Prior Art] A conventional power supply for a traveling wave tube amplifier consists of an anode electrode power supply that outputs an anode electrode voltage, and a helix/collector electrode power supply that outputs a helix electrode voltage and a collector electrode voltage. The rise and fall of the output voltage is controlled manually or by controlling by a time delay circuit that provides a certain time delay to give a time difference between the rise and fall of the anode electrode voltage and the other electrode voltages. It had been.

0003

[Problems to be Solved by the Invention] In this conventional traveling wave tube power supply, startup and shutdown operations are performed regardless of the state of the output of the power supply. It has the disadvantage that it is not possible to sequentially control startup and shutdown in response to such problems. Another drawback is that in order to ensure sequential control, a longer delay time with a more sufficient margin than the actually necessary delay time is required.

0004

[Means for Solving the Problems] A power source for a traveling wave tube according to the present invention includes a power source for an anode electrode, a power source for a helix electrode/collector electrode, and a cathode voltage detection circuit and a cathode current detection circuit. and a sequence control circuit that discriminates the output information of both circuits and sequentially controls the rise and fall of the output voltage.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be explained with reference to the drawings. FIG. 1 is a block diagram of an embodiment of the present invention, and FIG. 2 is a waveform diagram of each part of the embodiment. In FIG. 1, the main power source for the traveling wave tube is composed of a power source 1 for the anode electrode and a power source 2 for the helix electrode/collector electrode, and each power source is started or stopped by a start or stop signal output from a sequence control circuit 5. controlled. Sequence control circuit 5
The start/stop signal output from the helix is determined by a signal output from a cathode voltage detection circuit 3 that detects the voltage between the helix and the cathode, and a signal output from a cathode current detection circuit 4 that detects the beam current of the traveling wave tube. Controlled sequentially. FIG. 2 shows the relationship between the rise and fall of the output voltage of each power supply, the start/stop signal, and the beam current of the traveling wave tube.

[0006] First, the sequence control circuit 5 identifies the cut-off state in which no cathode current is flowing, based on the output signal of the cathode current detection circuit 4, and outputs a start signal for the power supply 2 for the helix electrode/collector electrode. After that, the sequence control circuit 5 controls the cathode voltage detection circuit 3
It is determined by the output signal that the helix collector voltage has definitely risen (ΔT in FIG. 2), and a start signal for the anode electrode power source 1 is output. By raising the output voltage sequentially in this way, it is possible to suppress the disturbance of the traveling wave tube's beam that occurs when the power supply voltage is raised, so that the traveling wave tube can operate reliably without overcurrent flowing through the helix. It becomes possible to start up. Furthermore, when the power supply voltage is turned down, the sequence control circuit 5 similarly identifies that the traveling wave tube is in the on state based on the output signal of the cathode current detection circuit 4 (Δt1 in FIG. 2), and then uses the power supply for the anode electrode Outputs a stop signal. Thereafter, the sequence control circuit 5 identifies that the traveling wave tube is in a cut-off state, that is, a state in which no beam current is flowing, based on the output signal of the cathode current detection circuit 4 (Δt2 in FIG. 2).
Outputs a stop signal for the power supply 2 for the helix electrode/collector electrode. By sequentially lowering the output voltage in this way, it is possible to suppress disturbances in the beam current of the traveling wave tube that occur when the power supply is turned off.

[0007]

[Effects of the Invention] As explained above, by using the traveling wave tube power supply according to the present invention, the sequence control of the rise and fall of the output voltage is reliably executed, so that the reliability of the traveling wave tube can be improved. It has this effect.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of one embodiment of the present invention.

FIG. 2 is a waveform diagram of this embodiment.

[Explanation of symbols]

1 Power supply for anode electrode 2 Power supply for helix electrode/collector electrode 3
Cathode voltage detection circuit 4 Cathode current detection circuit 5 Sequence control circuit

Claims (1)

[Claims] Claim 1: In a traveling wave tube power supply having an anode electrode power supply and a helix electrode/collector electrode power supply, a cathode voltage detection circuit, a cathode current detection circuit, and output information of both circuits are discriminated, A power source for a traveling wave tube, comprising a sequence control circuit that sequentially controls the rise and fall of an output voltage.