Hollow cathode power converter and control system thereof

Abstract

The invention provides a hollow cathode power converter and a control system thereof. The hollow cathode power converter comprises a main transformer primary side circuit and a main transformer auxiliary side rectifying and wave-filtering circuit; the output voltage of the main transformer auxiliary side rectifying and wave-filtering circuit is sampled to form voltage closed-loop control, and the output current of the main transformer auxiliary side rectifying and wave-filtering circuit is sampled to form output current closed-loop control; before the ignition of a hollow cathode is successful, a holding electrode and reference ground present high impedance, and a current closed-loop does not work; when the ignition of the hollow cathode is successful, the impedance of the holding electrode is decreased until the output voltage of the main transformer auxiliary side rectifying and wave-filtering circuit is dragged to be lower than a second set value so as to judge that the ignition of the hollow cathode is successful; and when the voltage of the holding electrode is decreased to be lower than the maximum limiting voltage of a holding power supply, closed-loop control is carried out on the output current of the main transformer auxiliary side rectifying and wave-filtering circuit. A heating power supply, an ignition power supply and the holding power supply are coupled to obtain a main converter, so that the power density is high, and the dynamic response is improved.

Description

technical field [0001] The invention relates to a power control circuit, in particular to a hollow cathode power converter and a control system including the hollow cathode power converter. Background technique [0002] The traditional hollow cathode power supply is composed of three power supplies: cathode heating power supply, cathode ignition power supply and cathode contact power supply. The power supply is referred to as the ignition power supply, and the cathode touch power supply is referred to as the touch power supply; the hollow cathode power supply is a power supply for the hollow cathode device. The heating power supplies power to the heater of the hollow cathode, the ignition power supply and the contact power supply are connected to the contact electrode of the hollow cathode at the same time, and provides high-voltage pulse voltage for ignition and contact current to maintain the ignition state for the contact electrode, and the heating power supply , the ign...

AI Technical Summary

Problems solved by technology

[0004] Description of existing technical problems and defects: At present, most power supplies for hollow cathodes are designed as independent heating power supply, ignition power supply and contact power supply to realize power supply to hollow cathodes. After the components are all started and working stably, the electric propulsion control system is used to judge the working status of the electric propulsion engine, and then send instructions to turn off the heating power supply, ignition power supply and touch power supply, which greatly delays the ignition success and reduces the output of the heating power supply. power time, which seriously affects the service life of the hollow cathode

In addition, the existing method of three independent power supplies powering the hollow cathode has disadvantages such as power supply volume, weight, low efficiency, and complicated design.

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