JP2760318B2 - High voltage power supply for microwave tube - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high voltage power supply for a microwave tube, and more particularly to a high voltage power supply for a microwave power supply used in a microwave tube communication amplifier. It relates to a high-voltage power supply for a wave tube.

[0002]

2. Description of the Related Art FIG. 3 is a block diagram showing a configuration of a conventional high voltage power supply for a microwave tube, and FIG. 4 is a diagram showing a sequence of applying a voltage to a microwave tube of the conventional high voltage power supply for a microwave tube. . Here, as the microwave tube, a traveling wave tube used for high-power microwave amplification is taken as an example.

FIG. 3 shows a traveling-wave tube 11 and a high-voltage power supply 13 for a traveling-wave tube for supplying necessary power to the traveling-wave tube 11. Further, the high-voltage power supply 13 for the traveling-wave tube comprises a helical power supply 1 and an anode power supply 2. , A collector power supply 3, a heater power supply 4 and a power supply control circuit 5, and FIG.
Anode voltage b, collector voltage c, heater voltage d, helix voltage terminal 101, anode voltage terminal 201, collector voltage terminal 301, cathode voltage terminal 401A, heater voltage terminal 401B, as well as helix electrode 111 of traveling wave tube 11, anode electrode 11
2, collector electrode 113, cathode electrode 114 and heater electrode
115 is also shown.

In a microwave tube including a traveling wave tube, since an electron beam is generated in a vacuum tube and the microwave is amplified by the action of the electron beam, a cathode for generating the electron beam is fixed at several hundreds to several hundreds of degrees. It has a heater for heating to the cathode temperature, and it is necessary to apply only the heater voltage before applying the other electrode voltages until the cathode temperature reaches a certain value and the electron beam can be generated stably. , This period is called heater preheating.

In the conventional high-voltage power supply for a microwave tube, it is necessary to output only the heater voltage prior to the other electrode voltage in order to perform the heater preheating. Therefore, the heater power supply is independent of the other electrode power supply. Had to be configured.

Next, a power-on sequence will be described with reference to FIG. In the initial state, helix power supply 1
, The anode power supply 2, the collector power supply 3, and the heater power supply 4 are all turned off. When the power is turned on in this state, first, the heater power supply 4 is turned on first, the built-in heater preheating timer starts to operate, and the heater is preheated. When the heater preheating is performed for a predetermined time, the operation of the heater preheating timer is completed.
The power is turned on one after another in a predetermined operation order of the helix power supply 1 and the anode power supply 2, and the power-on sequence is completed.

[0007]

In the above-mentioned conventional high-voltage power supply for a microwave tube, it is necessary to configure the heater power supply independently of the other electrode power supplies. This heater voltage is
Since the cathode potential at the negative high potential is applied to the microwave tube as a reference potential, it has to be transmitted to the microwave tube via a high voltage transformer.

For this reason, a high voltage transformer for the heater power supply and its driving circuit are required, and it is necessary to independently configure the heater power supply although the power is smaller than the other electrode power supplies. There has been a problem that the shape of the high-voltage power supply for the microwave tube becomes large, and that an increase in price due to a high-priced high-voltage transformer is inevitable.

An object of the present invention is to solve the above-mentioned problems,
An object of the present invention is to provide a high-voltage power supply for a microwave tube having a simple configuration that does not require the independent configuration of a heater power supply.

[0010]

The present invention has the following means in order to achieve the above object. In other words, the first configuration of the present invention is a high-voltage power supply for a microwave tube that supplies a voltage to be applied to each electrode of the microwave tube, and includes a heater power supply and a power supply other than the heater power supply required for the microwave tube. High-voltage power supply forming means for forming a high-voltage power supply including an integrated high-voltage power supply integrated by combining all or part of the high-voltage power supply, and a high-voltage power supply connection for interrupting connection between a voltage output of the high-voltage power supply and a corresponding electrode of the microwave tube The operation of the shut-off means, the high-voltage power supply and the high-voltage power supply cut-off means are controlled, and when the power is turned on, only the integrated high-voltage power supply is initially controlled to an operating state, and the heater preheating of the microwave tube is completed by the integrated high-voltage power supply. Power supply control means for temporarily suspending the operation of the integrated high-voltage power supply immediately before application of an electrode voltage other than a heater, Power output of the and a high voltage discharge means for enabling discharge at a sufficiently shorter time than the heater radiator time after pausing the completion to the operation of the integrated high voltage power supply to the heater preheating.

According to a second configuration of the present invention, in the first configuration, the operation of the integrated high-voltage power supply controlled by the power supply control means is temporarily stopped by a predetermined preheating time for the heater of the microwave tube. And the influence on the cathode temperature due to the absence of the heater voltage due to the temporary stop does not hinder the operation of the microwave tube, and is limited to a preset time.

In a third configuration of the present invention, in the first or second configuration, the interruption of the voltage output of the integrated high-voltage power supply by the high-voltage power supply connection / interruption means is performed by the power supply control means. In the initial state of turning on the high-voltage power supply, the high-voltage power supply is kept in the cut-off state, and is restored to the connected state after the high-voltage discharging means performs the discharging.

[0013]

The operation of the present invention will be described below. In the power supply for a microwave tube according to the present invention, a high-voltage power supply forming means for forming a high-voltage power supply including a heater power supply and an integrated high-voltage power supply in which a part or all of a power supply required for another microwave tube is integrated; A high-voltage power supply disconnection means for disconnecting the voltage output of the high-voltage power supply from the corresponding electrode of the microwave tube, and applying an electrode voltage other than the heater after the completion of the preheating of the heater to the microwave tube. It has voltage control means for temporarily stopping the operation of the high-voltage power supply, and discharge means for discharging the output of the integrated high-voltage power supply prior to turning on another power supply.

In the present invention having such means, the heater power supply can be connected to another microwave by providing the high voltage power supply connection cutoff means for cutting off the connection between the voltage output of the high voltage power supply and the corresponding electrode of the microwave tube. Voltage control that can be integrated with part or all of the power supply required for the tube, and that stops the operation of generating the high-voltage power supply immediately before the application of the electrode voltage other than the heater after the completion of the heater preheating of the microwave tube A switching device such as a small and low-priced relay with a low switching voltage is used as a connection disconnecting means that can disconnect the voltage output of the high-voltage power supply from the connection with the corresponding electrode of the microwave tube by providing the means. This makes it possible to secure the overall miniaturization with a simple configuration.

[0015]

Next, the present invention will be described with reference to the drawings. FIG. 1 is a block diagram showing the configuration of one embodiment of the present invention. The embodiment shown in FIG. 1 includes a traveling wave tube 11 and a high-voltage power supply 12 for the traveling wave tube. In addition, a high-voltage power supply 12
Are a helical power supply 1, an anode power supply 2, a power supply control circuit 5 as a power supply control means, a heater / collector power supply 6 combining a heater power supply and a collector power supply, and a power supply control circuit that cuts off collector voltage application. It comprises a collector voltage cut-off relay 7 constituting voltage connection cut-off means and a collector voltage discharge circuit 8 constituting high voltage discharge means enabling discharge of the collector voltage.

FIG. 1 shows a helical voltage terminal 101,
Anode voltage terminal 201, collector voltage terminal 601A, cathode voltage terminal 601B, heater voltage terminal 601C, and traveling wave tube 11
Helix electrode 111, anode electrode 112, collector electrode 11
3, the cathode electrode 114 and the heater electrode 115 are shown together.

FIG. 2 is a diagram showing a sequence of applying a voltage to the traveling wave tube of the traveling wave tube high-voltage power supply of the embodiment of FIG.
Hereinafter, the operation of the embodiment will be described with reference to FIGS. 1 and 2 and taking a traveling wave tube used for high power microwave amplification as an example of the microwave tube as in the conventional technique.

In FIG. 1, in an initial state, a helix power supply 1, an anode power supply 2, and a heater / collector power supply 6 are provided.
Are turned off, and the collector voltage cut-off relay 7 is connected to the cathode voltage terminal 601B side. When the power supply ON signal is input to the power supply control circuit 5, the heater / collector power supply 6 is first turned on, the built-in heater preheating timer is operated, and the heater voltage d and the collector voltage c are increased by the traveling wave tube high voltage power supply 12. The generated heater voltage d is applied between the cathode electrode 114 and the heater electrode 115 of the traveling wave tube 11. On the other hand, the collector voltage c is not applied to the traveling wave tube 11 because the collector voltage cut-off relay 7 is connected to the cathode voltage terminal 601B under the control of the power supply control circuit 5. FIG. 1 shows this connection state.

Next, when a prescribed preheating time has elapsed, first, the heater / collector power supply 6 is turned off, and the collector voltage c is discharged by the collector voltage discharging circuit 8. The collector voltage discharging circuit 8 has a resistance component with respect to the collector voltage c output from the heater / collector power supply 6, and when the collector voltage is applied, the collector voltage is held in a terminating state by this resistance component, so that the application of the collector voltage c is stopped. And the collector voltage c is discharged through the resistance component. The discharge time T in this case is determined by the circuit constant of the collector voltage discharge circuit 8, and the discharge time T is set to a time sufficiently shorter than the heater heating time constant of the traveling wave tube 11, for example, 1 second or less.

After the discharge time T elapses after the heater / collector power supply 6 is turned off and the collector voltage c falls below the allowable switching voltage of the collector voltage cut-off relay 7, the contacts of the collector voltage cut-off relay 7 are turned off. Collector voltage terminal 60
Switch to 1A side.

After the switching of the contacts of the collector voltage cutoff relay 7 is completed, the heater / collector power supply 6, the helix power supply 1, and the anode power supply 2 are turned on again, and the heater voltage d, the collector voltage c, the helix voltage a, and the anode voltage b is applied between the heater electrode 115, the cathode electrode 114, the collector electrode 113, the helix electrode 111, and the anode electrode 112 of the traveling wave tube 11, respectively, to complete the power-on sequence.

As shown in FIG. 2, in the initial state, the helix power supply 1, the anode power supply 2, and the heater / collector power supply 6 are all in the OFF state, and the collector voltage cut-off relay 7 is connected to the cathode voltage terminal 601B. It is connected.

Next, when a power ON signal is input, only the heater / collector power supply 6 is turned off under the control of the power supply control circuit 5.
The state is set to the N state, the heater preheating timer operates for a specified time, and the heater voltage d is supplied to the traveling wave tube 11 to complete the heater preheating. After the completion of the heater preheating, the heater / collector power supply 6 is temporarily turned off, and the collector voltage c is discharged through the impedance of the collector voltage discharging circuit 8.
This discharge is performed for a time sufficiently shorter than the heater heat radiation time constant of the traveling wave tube 11.

Next, the collector voltage cut-off relay 7 is switched to the collector voltage terminal 601A side under the control of the power supply control circuit 5. Also, the heater / collector power supply 6 is turned off again.
Then, the helix power supply 1 and the anode power supply 2 are sequentially turned on to complete the power-on sequence.

With the conventional microwave tube high voltage power supply, the heater voltage d is not turned off while the traveling wave tube 11 is operating. This is because the OFF state is prohibited because the cathode temperature of the traveling-wave tube 11 decreases and the stable generation of the electron beam is hindered. However, since the heater of the microwave tube represented by the traveling wave tube has a heat storage function, the cathode temperature does not immediately decrease even if the heater voltage is stopped for a very short time. According to experimental data, it has been found that if the heater voltage is stopped for 5 seconds or less, the operation of the traveling wave tube is not significantly affected.

Therefore, the heater / collector power supply 6 is
Elapsed discharge time T at the collector voltage discharge circuit 8 becomes F state, switches the relay contact of the collector voltage cutoff relay 7, the time T _A traveling wave tube until the heater / collector power supply 6 is turned ON again The power-on sequence described above can satisfy the requirements for a high-voltage power supply for a microwave tube within a time period in which the decrease in the cathode temperature does not pose a problem in the case of 11.

In the above-described embodiment, it is necessary to change the operation sequence of the power supply control circuit for the conventional high-voltage power supply for a microwave tube, cut off the collector voltage, add a collector voltage discharge circuit, and the like. 1)-(3) reasons,
(1) Since the sequence of the power supply control circuit normally uses a microprocessor, it can be easily handled by changing software. (2) Since the collector voltage is cut off after the collector voltage is discharged, the actual switching voltage is sufficiently low, only a static withstand voltage is required, and the dynamic withstand voltage may be low. realizable. (3) The collector voltage discharge circuit generally already has a function in the power supply for safety after the power supply is stopped, and there is little need to dare to add it. For such reasons, it can be realized as an extremely simple configuration.

In the above-described embodiment, the collector voltage cut-off relay 7 having a mechanical contact is used as the high voltage power supply connection cut-off means for cutting off the collector voltage.
Other means, such as a switching circuit using a semiconductor, can be easily implemented.

Further, in this embodiment, the collector power supply as an integrated power supply with the heater power supply is taken as an example. However, the integration with the helix power supply or all the power supplies can be similarly performed. Can be easily realized without impairing the spirit of the present invention.

[0030]

As described above, the high-voltage power supply for a microwave tube according to the present invention does not need to be constituted independently by combining a heater power supply with another power supply. There are effects that can be realized.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of a high-voltage power supply for a microwave tube according to one embodiment of the present invention.

FIG. 2 is a diagram showing a power-on sequence in the embodiment of FIG.

FIG. 3 is a block diagram showing a configuration of a conventional high-voltage power supply for a microwave tube.

FIG. 4 is a diagram showing a power-on sequence of a conventional high-voltage power supply for a microwave tube.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Helix power supply 2 Anode power supply 3 Collector power supply 4 Heater power supply 5 Power supply control circuit 6 Heater / collector power supply 7 Collector voltage cut-off relay 8 Collector voltage discharge circuit 11 Traveling wave tube 12 High voltage power supply for traveling wave tube 13 High voltage power supply for traveling wave tube

Claims (3)

(57) [Claims] 1. A microwave tube high-voltage power supply for supplying a voltage to be applied to each electrode of a microwave tube, wherein a heater power supply and a part or all of a power supply other than the heater power supply required for the microwave tube are combined. A high-voltage power supply forming means for forming a high-voltage power supply including an integrated high-voltage power supply, a high-voltage power supply connection cut-off means for cutting off connection between a voltage output of the high-voltage power supply and a corresponding electrode of a microwave tube; The power supply and the operation of the high-voltage power supply cutoff means are controlled. When the power supply is turned on, only the integrated high-voltage power supply is initially controlled to an operating state, and after the heater preheating of the microwave tube is completed by the integrated high-voltage power supply, the electrodes other than the heater are turned off. Power supply control means for temporarily stopping the operation of the integrated high-voltage power supply immediately before applying a voltage; and an output of the high-voltage power supply of the integrated high-voltage power supply applied to the microwave tube. A high-voltage power supply for a microwave tube, comprising: a high-voltage discharge unit that discharges in a time sufficiently shorter than a heater radiation time after the heater preheating is completed and the operation of the integrated high-voltage power supply is temporarily stopped. 2. The method according to claim 1, wherein the operation of the integrated high-voltage power supply controlled by the power supply control means is temporarily stopped because a predetermined preheating time for the heater of the microwave tube has passed and the heater voltage is not present due to the temporary stop. 2. The apparatus according to claim 1, wherein the influence on the temperature is limited to a preset time which does not affect the operation of the microwave tube.
A high-voltage power supply for a microwave tube according to the description. 3. The interruption of the voltage output of the integrated high-voltage power supply by the high-voltage power supply connection / interruption means is maintained in an interrupted state in an initial state of power-on to the integrated high-voltage power supply by the power supply control means; 3. The high-voltage power supply for a microwave tube according to claim 1, wherein the high-voltage power supply restores a connected state after the high-voltage discharging unit performs discharge.