Vacuum tube transmitter load slow start control method and circuit

Abstract

The invention relates to a vacuum tube transmitter loaded slow start control method and a vacuum tube transmitter loaded slow start control circuit. The vacuum tube transmitter loaded slow start control circuit comprises a high-frequency clock source, a frequency divider, a rising edge trigger, a numeric comparator, a counter, a pulse width stepping controller, a AND gate and a NON gate, wherein the output end of the high-frequency clock source is connected with the frequency divider; the output end of the frequency divider is connected with the clock input ends of the rising edge trigger, the counter and the pulse width stepping controller; the data output ends of the counter and the pulse width stepping controller are connected with the data input end of the numeric comparator; the numeric comparator is connected with the data input end of the rising edge trigger; the output end of the rising edge trigger is connected with one input of the AND gate; an input signal is connected with the other input ends of the rising edge trigger, the counter, the NON gate and the AND gate. The vacuum tube transmitter loaded slow start control method and the vacuum tube transmitter loaded slow start control circuit, disclosed by the invention, have the advantages that loaded slow starting of a vacuum tube transmitter is realized, a high-voltage power supply of the vacuum tube transmitter adapts to random duty ratio change, the design difficulty of the high-voltage power supply is greatly reduced, and the reliability of a whole system is increased.

Description

Technical field [0001] The invention belongs to the technical field of radar transmitters, and particularly relates to a control method for controlling the working load of a vacuum tube transmitter. Background technique [0002] Travelling wave tube transmitters are widely used in radar, electronic countermeasures, satellite communications and other fields. There are two working modes for traveling wave tube transmitters. One is working in a pulsed state. The working ratio of the transmitter is determined by the working repetition frequency and pulse width. , The duty ratio is equal to the repetition frequency multiplied by the pulse width, and its value varies between greater than 0 and less than 100%; the other works in continuous wave state, and its duty ratio is 100%. [0003] As a kind of controlled high-power vacuum device, the traveling wave tube is turned on and off by the grid or focusing electrode (hereinafter collectively referred to as the control electrode) of the trav...

AI Technical Summary

Problems solved by technology

When the equivalent load impedance changes due to the change of the working ratio, the high-voltage power supply voltage must be adjusted in real time following the change of the load. When the working ratio changes greatly, such as changing from no-load to full-load or from full-load to no-load, the load impedance The rate of change is huge, and there will be two problems: one is that the high-voltage power supply often cannot adapt to the closed-loop speed adjustment, and the voltage drop will cause synchronous voltage changes, and the traveling wave tube will not work normally, causing the transmitter to malfunction and reduce the reliability of the system. Second, the high-voltage power supply itself will also bear a lot of stress due to sudden and severe changes in the load, and it is easy to damage the power devices such as switching tubes and rectifiers in the high-voltage power supply due to large stress

[0004] In order to solve the above problems, a fixed dummy load can be connected in parallel at both ends of the traveling wave tube. When the traveling wave tube is not working, the high voltage power supply can be operated under a certain load impedance. When the traveling wave tube is turned on or off under control, the whole The load impedance of the power supply is equal to the sum of the equivalent load impedance of the traveling wave tube and the fixed false load impedance. The change rate of the load impedance of the high-voltage power supply is limited within a certain range, so that the high-voltage power supply can adapt to the load change and adjust in real time. Meet the requirements, but the disadvantages of this method are that the efficiency of the entire system is reduced, the cost is increased, and the volume of the system is increased. At the same time, problems such as heat dissipation of the dummy load must be solved.

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