High-frequency high-voltage X-ray defect detector

Abstract

The invention provides a high-frequency high-voltage X-ray defect detector which comprises an X-ray tube, a filament power part and a high-voltage variable-voltage part, wherein the high-voltage variable-voltage part is formed by connecting a high-frequency high-voltage transformer and a high-frequency driving circuit; the high-frequency high-voltage transformer consists of a primary winding and a secondary winding which are radially wound in an overlapping manner inside and outside an insulating shielding layer on a magnetic core; the corresponding ends of the two windings are arranged correspondingly; the secondary winding is formed by multiple windings which are in the same winding direction and spiral direction as the primary winding and sequentially arranged along the axis of the magnetic core; the filament power part is a PWM (pulse-width modulation) circuit; and a PWM signal modulation circuit realizes electric isolation between the high-voltage part and low-voltage part to transmit PWM signals through optical fiber or photo-coupler and optical fiber or photo-coupler. In the technical scheme, both the high-voltage variable-voltage part and the filament power part are small, the work is reliable, the safety performance is excellent, a high-voltage cable is not required, and the size of the X-ray defect detector is determined by the size of the X-ray tube.

Description

Technical field [0001] The patent application of the present invention relates to an X-ray flaw detector, in particular to an X-ray flaw detector with high frequency, small volume and efficient X-ray tube operation. Background technique [0002] The core component of the X-ray flaw detector is the X-ray tube. The working efficiency of the X-ray tube depends on the high-voltage transformer part and the filament power supply part. The high-voltage transformer part forms a strong high-voltage electric field between the cathode and anode, and the filament power supply part is the cathode. The filament is powered separately, which prompts the filament to generate free electrons, which are accelerated under a high-voltage electric field into a high-energy electron beam that bombards the anode plate and generates X-rays. In the existing X-ray flaw detectors, the high-voltage transformer part is connected to the X-ray tube barrel by a high-voltage cable at a safe distance, independent of...

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Problems solved by technology

[0003] High frequency, small size, high voltage, and high power are the development directions of X-ray flaw detector technology, but there are many technical problems in the development of high-frequency transformer technology: low voltage output value of transformer, low work efficiency, serious self-heating, distributed capacitance and leakage The negative impact of capacitors in high-frequency working conditions, etc., so high-frequency high-voltage transformation technology has become an insurmountable technical bottleneck in the development of flaw detector technology. In addition, the acquisition of power signals for the filament power supply, the insulation protection of high-voltage electrical, and how to realize filament adjustment. The pressure function is a technical problem that directly affects the performance of the flaw detector and needs to be solved urgently.

Capacitance is an important component used to temporarily store peak energy in the existing peak energy absorption circuit, but its energy release is mostly consumed on the discharge resistor, which consumes heat, so how to use a simple and stable circuit to improve energy utilization efficiency and avoid flaw detection The heating of the unit components is the biggest problem faced by the X-ray flaw detector

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