High-voltage generator used for X-ray machine and control method thereof

Abstract

The invention discloses a high-voltage generator used for an X-ray machine and a control method thereof. The high-voltage generator comprises a rectifying and wave-filtering and soft-start unit connected with a power supply, a control power supply, and a voltage rising and rectifying unit in a high-voltage oil tank. The high-voltage generator is characterized in that the rectifying and wave-filtering and soft-start unit is connected with a power factor correction unit, is connected with the positive pole of an X-ray tube in the high-voltage oil tank through a high-voltage inverter and the voltage rising and rectifying unit, and is connected with the negative pole of the X-ray tube through a filament inverter and a filament converting circuit; a sampling circuit connected with a central control unit is arranged inside the high-voltage oil tank; and the central control unit is respectively connected with the high-voltage inverter, the filament inverter and a host computer. Compared with the prior art, the high-voltage generator has the advantages that the high-voltage generator adopts a series-parallel resonance technique to realize the zero-voltage opening of a switch tube, and thus the switching frequency can be improved to 100 kHz; the problems of high voltage insulation and protection caused by extracting a high voltage wire externally connected with an X-ray tube from the high-voltage oil tank are avoided because that the X-ray tube is integrated inside the high-voltage oil tank.

Description

technical field [0001] The invention relates to the field of X-ray machines, in particular to a high-voltage generator used in X-ray machines and a control method thereof. Background technique [0002] Before 1997, my country was basically in the development stage of power frequency X-ray machines, and both intermediate frequency and high frequency machines were imported. [0003] X-ray machines are mainly used in related fields such as safety inspection, medical and health, and industrial flaw detection. The development of high-voltage generator technology for X-ray machines has gone through the development stage from power frequency 50Hz to intermediate frequency hundreds of Hz to high frequency several kHz. The increase in the operating frequency of the generator has brought about a significant reduction in the volume and weight of the device, a significant increase in power density, and a great leap in performance indicators and imaging quality. [0004] In recent years...

AI Technical Summary

Problems solved by technology

High-voltage cables are expensive, and the nearby insulation design is difficult

The operating frequency of the above-mentioned high-voltage generator generally does not exceed 40kHz, mainly because high-frequency operation will bring greater switching loss, and the loss will damage the switching tube if the loss is large enough.

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