JPS623511A - Power supply connection system for large power amplifier tube conversion circuit - Google Patents

Abstract

PURPOSE:To suppress a phase fluctuation of a high frequency signal to a small value by connecting the 1st power supply between a cathode of a large power amplitude tube and a body and connecting the 2nd power supply independently of the 1st power supply between a collector and the cathode. CONSTITUTION:The amplifier tube 1 is provided with a cathode terminal 11, a grid terminal 2, a body terminal 13 and a collector terminal 14. A grid modulator 2 outputs a grid voltage to the amplitude tube 1, a voltage is given between the body terminal 13 and the cathode terminal 1 from a power supply 8 and a power suppl 9 gives a voltage to the collector terminal 14 with respect to a potential at the cathod terminal 11. Thus, the voltage fluctuation of the cathode is suppressed, resulting in suppressing the phase fluctuation of a high frequency signal being an output of the amplifier tube to a small value.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a power supply connection system for a modulation circuit that is used in a radar device or the like and uses a high-power multipole amplifier tube.

(Prior Art) In general, power supply systems for multipole amplifier tubes include a single power supply system shown in FIG. 2 and a two power supply system shown in FIG. 3. Comparing the - source method and the dual power source method, the dual power source method is more often used because it allows the use of multipole amplifier tubes more efficiently.

One of the main factors for improving the ability to detect a moving target (hereinafter referred to as 'MTI' according to its common name) in a radar device is to reduce phase fluctuations between high-frequency pulses of the output of a transmitting amplifier tube. TWT (traveling wave tube)
In amplifier tubes such as the Fluctuations occur. The ratio between the voltage (E) that can be applied to the amplifier tube and the phase fluctuation (Δφ) is called phase sensitivity. Generally, the phase sensitivity to cathode voltage fluctuations is several tens of times larger than the phase sensitivity to collector voltage fluctuations. Therefore, reducing the cathode voltage fluctuation leads to reducing the phase fluctuation of the high frequency signal and improving the MTI performance.

In the conventional two-power supply system, as shown in FIG. 3, the outputs of the power supplies 5 and 6 are added together to form a cathode voltage, which is applied to the cathode terminal 11 of the amplifier tube 1. Further, the output voltage of the power supply 5 was applied to the collector terminal 14 of the amplifier tube 1 .

(Problem to be Solved by the Invention) In the circuit shown in FIG. 2, when the grid voltage is completely applied to the grid 16 in synchronization with the high frequency signal input to the amplifier tube 1, electrons are emitted from the cathode 15 and sent to the collector 1B. Head over. These electrons interact with the high-frequency signal, resulting in a high-power high-frequency signal. At this time, a cathode current 11, a body current i, and a collector current i flow through the cathode 15, body, and collector 1B of the amplifier tube 1, respectively. In addition, the power source 5 has a voltage fluctuation Δ proportional to the body current i.
E2, and the power supply 6 causes a voltage fluctuation ΔE1 proportional to the cathode current 11. Therefore, the voltage fluctuation of the cathode pressure is ΔE1+ΔE2, and the voltage fluctuation of the collector voltage is ΔE2. Generally, in a grid modulated TWT, i,
< is, the power supply method shown in FIG. 2 suppresses the fluctuation of the collector voltage to a small level, but increases the voltage fluctuation of the cathode voltage. In other words, since the cathode voltage, which has high phase sensitivity, fluctuates greatly, the phase fluctuation of the cathode cannot be reduced, and the MTI performance cannot be improved. Possible ways to solve this problem include connecting a capacitor with a large capacity to the power supply or using a switching regulator as the WL source, but both require large koji and are not practical.
It can be said that it is economically unrealistic.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a power supply connection system for a high-power amplifier tube modulation circuit in which phase fluctuations of high-frequency signals can be suppressed to a small level.

(Means for Solving the Problems) In order to solve the above-mentioned problems, the present invention provides a power supply connection system for a high power amplifier tube modulation circuit, in which a first A power source is connected thereto, and a second power source independent of the first power source is connected between the collector of the high power amplifier tube and the cathode.

(Example) Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a system diagram showing one embodiment of the present invention. This embodiment is composed of an amplifier tube 1, a grid modulator 2, current limiting resistors 3 and 7, and power supplies 8 and 9.
3 and a collector terminal 14. The grid modulator 2 outputs a grid voltage to the amplifier tube 1, the power supply 8 supplies voltage between the body terminal 13 and the cathode terminal 11, and the power supply 9 supplies voltage to the collector terminal 14 with reference to the potential of the cathode terminal 11. Supply voltage. The flow limiting resistors 3 and 7 are
The current is limited when arcing occurs in the amplifier tube 1.

In the power supply connection system shown in FIG. 3, the output current of the power supply 8 that provides the cathode voltage is a body current, which is small, so that voltage fluctuations are small. Although the phase sensitivity of the cathode is high, the voltage fluctuation is small, so the phase fluctuation can be kept small. Furthermore, since the 1 tR capacity is small, even a switching regulator type power supply can have a realistic size, and the switching regulator voltage can be stabilized.

(Effects of the Invention) As explained above, according to the present invention, a power supply connection method for a high-power amplifier tube modulation circuit that suppresses voltage fluctuations in the cathode voltage and, in turn, suppresses phase fluctuations of the high-frequency signal that is the output of the amplifier tube. can be provided. Therefore, by applying the method of the present invention to radar, it is possible to improve MTI performance.

[Brief explanation of the drawing]

FIG. 1 is a system diagram of an embodiment of the present invention, FIG. 2 is a system diagram of a conventional single power supply system, and FIG. 3 is a system diagram of a conventional two power supply system. 1... Amplifier tube, 2... Grid modulator, 3, 7...
・Current limiting resistor, 4, 5, 6, 8.9...Power supply.

Claims (1)

[Claims] A first power supply is connected between the cathode and the body of the high power amplifier tube, and a second power supply independent of the first power supply is connected between the collector of the high power amplifier tube and the cathode. A power supply connection method for a high-power amplifier tube modulation circuit.