SU1221767A1 - X-ray generator - Google Patents

Abstract

In the X-ray generator, the input signal of the anode current stabilizer 7 is obtained by subtracting the signal from the imbalance current sensor 10 from the sensor signal of the anode current 6 connected between the control electrode of the x-ray tube 2 and the output of the bias voltage source 9. This provides a simplified design and the availability and maintainability of the generator: 1 sludge.

Description

The invention relates to X-ray technology, namely to X-ray generators containing a three-electrode X-ray tube with a grounded anode and means for stabilizing the anode current.

The purpose of the invention is to simplify the design and increase maintainability.

The drawing shows a diagram of the x-ray generator.

The X-ray generator contains a source of stabilized high voltage, an X-ray tube 2 with a grounded anode 3, an incandescent cathode 4, and a control electrode 5 isolated from them. An anode current sensor 6 is connected between the positive terminal of high-voltage source 1 and ground. Anodic current stabilizer 7 contains a source of voltage voltage 8 connected to the filament cathode 4, and source 9 of a bias voltage connected by one voltage to a negative output of a high voltage source 1. A leakage current sensor 10 is connected between the other output of the bias voltage source 9 and the control electrode 5. The measuring lead of the leakage current sensor 10 is connected through the galvanic isolation device 11 to the input of the subtracting circuit 12. To the second input of the subtraction circuit 12, the measuring circuit is connected

Water sensor 6 anode current. The output of the subtraction circuit 12 is connected to the control input of the stabilizer 7 of the anode current.

The x-ray generator works as follows.

When a high voltage source 1 and a voltage source 8 are turned on, an anode current flows through the x-ray tube 2, which is the sum of two components. The first of them is caused by the movement of electrons from the filament cathode 4 to the anode 3 and creates useful x-rays. The second, parasitic component, due to leakage currents from

the control electrode 5 through the pro

5 0 5 o

five

,

0

interstitial vacuum gap. Through the glass of the X-ray tube 2, it flows around the leakage current sensor 10. Through the device 11, galvanically isolating the signal from the leakage current sensor 10 goes to the first input of the subtraction circuit 12, to the second input of which a signal is received from the sensor 6 of the anodic current, which is a sum of both components. anode current. From the output of the subtraction circuit 12 to the control input of the stabilizer 7 of the anodic current, the signal carrying information only about the first, useful component of the anodic current arrives in this way.

In the proposed X-ray generator, the stabilizer 7 of the anode current may be at a potential close to that potential.

Claims (1)

Invention Formula X-ray generator containing a source of stabilized high voltage, an X-ray tube with a grounded anode, a cathode and an isolated control electrode, an anode current sensor and an anode current stabilizer with a voltage source of the cathode and a bias voltage source, one output of which is connected to the negative terminal of the source high voltage, characterized by 4TOj in order to simplify the design and increase maintainability, a leakage current sensor is inserted in it, connected between the control element X-ray tube electrode and other source of bias voltage source, galvanic isolation device and subtraction circuit, the measuring output of the leakage current sensor through the galvanic isolation unit connected to one input of the subtraction circuit, to the other input of which the measuring output of the anode current sensor connected between a positive terminal of the high voltage source and ground, and the output of the subtraction circuit is connected to the control input of the anode current stabilizer.