JP2794817B2 - Power supply circuit for traveling wave tube amplifier - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power supply circuit for a traveling-wave tube amplifier (hereinafter referred to as a TWT power supply), and more particularly to a TWT power supply that operates a protection circuit by remote control of a command signal.

[Conventional technology]

Conventionally, this type of TWT power supply has a low piezoelectric wave circuit 3 and a high voltage transformer 5 'for the cathode as shown in the configuration diagram of FIG.
A high-voltage radio circuit 4 'having a high-voltage transformer 6' for the collector and a high-voltage transformer 7 'for the anode,
A specified high voltage was supplied to each electrode such as a collector and an anode.

[Problems to be solved by the invention]

The above-described conventional TWT power supply may cause a discharge due to a decrease in the withstand voltage function between the electrodes in the TWT tube. As a cause of this decrease in withstand voltage, impurities may adhere to the electrodes, but in the conventional TWT power supply, the supply voltage of each high-voltage power supply is a fixed voltage. There is a disadvantage that it is not possible to perform a proper operation. Therefore, there is a disadvantage that the discharge causes a temporary deterioration of the signal.

An object of the present invention is to provide a TWT power supply circuit that can prevent TWT discharge during signal transmission.

[Means for solving the problem]

The TWT power supply of the present invention is a traveling-wave tube amplifier power supply circuit that can be remotely operated by a command signal, wherein the low-voltage power supply circuit has a terminal for generating a low-voltage and changing the low-voltage by an external control signal; A plurality of high-voltage transformers for inputting the low-voltage and converting the high-voltage to a high voltage; and a switch for switching a tap on each primary side to increase an output voltage of the high-voltage transformer. A high-voltage power supply circuit having a protection circuit for supplying a control signal detected and output to a control terminal of the low-voltage power supply circuit, wherein the switch is controlled by a command signal for remote operation.

〔Example〕

 Next, the present invention will be described with reference to the drawings.

FIG. 1 is a configuration diagram of one embodiment of the present invention. The embodiment shown in FIG. 1 comprises a high voltage power supply circuit 4 for supplying a high voltage to each of the anode, collector and cathode electrodes of the TWT 2 and a low voltage power supply circuit 3 for inputting a low voltage to the high voltage power circuit 4. Here, a high-voltage power supply 4 includes a high-voltage transformer 5, which generates high voltages of a Canono voltage, a collector voltage, and an anode voltage.
The switches 1A to 1C are provided on the primary side of the high-voltage transformers 5, 6, and 7. The switches are driven by a command control signal input from a command terminal 9, and the high-voltage transformer 5 , 6, 7 switches 1A to 1C lower by one tap, and an overvoltage higher than the operating voltage can be applied to each electrode.
Due to this overvoltage, the power supply circuit is overloaded, and TWT2
The stress on When such a constant energy is supplied to the TWT for a short time, a control signal is sent from the protection circuit 8 via the control terminal 10 to return the overvoltage to the low-voltage power supply circuit 3.

As described above, the TWT to which the overvoltage is temporarily applied by the present power supply circuit is discharged, the impurities attached between the electrodes are skipped, and the breakdown voltage can be increased.

〔The invention's effect〕

As described above, the present invention periodically applies an overvoltage to the TWT by a command signal except for between signal transmitters,
By artificially discharging the TWT, there is an effect that the TWT is difficult to discharge for a certain period. Therefore, it is possible to prevent quality deterioration of the transmission signal due to the discharge.

[Brief description of the drawings]

FIG. 1 is a block diagram of an embodiment of the present invention, and FIG. 2 is a block diagram of a conventional power supply circuit for a traveling wave amplifier. 1A ~ 1C ... switch, 2 ... traveling wave tube amplifier (TWT),
3 ... Low voltage power supply circuit, 4,4 '... High voltage power supply circuit, 5,6,7 ...
... high voltage transformer, 8 ... protection circuit, 9 ... command terminal, 10 ... control terminal.

Claims (1)

(57) [Claims] 1. A traveling-wave tube amplifier power supply circuit which can be remotely operated by a command signal, comprising: a low-voltage power supply circuit having a terminal for generating a low-voltage and changing said low-voltage by an external control signal; A plurality of high-voltage transformers for inputting a voltage and converting the voltage to a high voltage; a switch for switching a tap on each primary side to increase an output voltage of the high-voltage transformer; and detecting an overvoltage on each high-voltage side of the high-voltage transformer And a high-voltage power supply circuit having a protection circuit for supplying a control signal output as a control signal to the control terminal of the low-voltage power supply circuit, wherein the switch is controlled by a command signal for remote operation. Power circuit.