SU788454A1 - X-ray generator - Google Patents

Description

I

The invention relates to x-ray technology.

X-ray generators are known, containing two x-ray tubes with grounded anodes, glow transformers, anode current stabilizers, a total anode current separation circuit that includes two parallel circuits containing each current stabilizer (voltage) sensor of one of the tubes and electrically controlled resistance , to the control input of which is supplied a signal proportional to the current (voltage) of the filament of the same tube 1.

The main disadvantage of this device is the strong interconnection of the control circuits, which results in low reliability and accuracy of stabilization.

The closest technical solution to the proposed one is an X-ray generator containing two X-ray tubes with grounded anodes, a common high-voltage source, transformers of heat, stabilizers of the anode currents of the X-ray tubes, a circuit for dividing the total anode current in the ground circuit of the anodes into two components.

each of which contains an anode current stabilizer sensor of one of the tubes and an electrically controlled resistance, tube voltage sensors, non-linear functional transducers, glow voltage sensor signals, comparison circuits, to the input of each of which one output of one functional transducer and one of the sensors are connected an anodic current stabilizer, and an output to one of the electrically controlled resistances in the total anodic current separation circuit 2.

Such a solution allows to increase the accuracy and reliability of separate stabilization of anode currents in an x-ray generator containing two tubes with grounded anodes.

A disadvantage of the known generator is the low range of adjustment of the anode currents.

The purpose of the invention is to extend the range of anode current control.

The goal is achieved by the fact that in an X-ray generator containing two X-ray tubes with grounded anodes, a common high-voltage source

voltages, incandescent transformers, x-ray tube anode current stabilizers, a circuit for dividing the total anode current in the anode grounding circuit into two components, each of which contains an anode current stabilizer sensor in one of the tubes and electrically controlled resistance of one of the tubes , nonlinear functional converter of the voltage sensor of the voltage, comparison circuit, to the inputs of which the output of the functional nonlinear converter and the stabilizer sensor are connected The anodic current of one of the tubes, electrically controlled resistances in the total anodic current separation circuit are included in the balanced cascade circuit, means for setting the operating point of the balanced cascade are inputted to the generator, the output of the comparison circuit is connected to one input, and means for setting the operating point .

The drawing shows the functional diagram of the generator.

The X-ray generator contains stabilizers 7 of the anode current of each of the X-ray tubes 2 and 3, a voltage sensor 4 on the primary winding of the transformer 5 of the heater of one of these tubes, a functional non-linear converter 6 of this voltage, sensors 7 of the anode current stabilizers of each of the X-ray tubes, voltage comparison circuit 8 and balanced cascade 9 of electrically controlled resistances, which, together with sensors 7, is a circuit for dividing the total anode current.

The anode voltage is supplied from a common source 10.

The voltage sensor 4 signal on the primary winding of the transformer 5 of one of the X-ray tubes, for example, tube 2, is converted by a functional non-linear converter 6 into a signal whose magnitude is proportional to the anode current of the X-ray tube by its values and variations.

At any values of the total current in the circuit with a controlled resistance, a current always flows, the value of which is proportional to the signal at the output of the nonlinear converter 6, and, consequently, to the anode current of the corresponding tube. This is achieved by comparing the signal from the output of the nonlinear converter 6 with the signal of sensor 7 using the voltage comparison circuit 8, the output of which affects the electrically controlled resistance of the total current separation circuit so that the difference of these signals tends to zero.

In order to expand the anode current control range, the total anodic current separation circuit contains controllable resistances included in a balanced cascade, for example, a transistor, one of the inputs of which is connected to the input of the comparison circuit and the other with the means of setting the balance cascade entered not shown).

The accuracy of separation of the total anode current, and, consequently, the accuracy of stabilization of the proposed method is determined mainly by the accuracy of the nonlinear current.

converter 6, which can be performed, for example, on an electron-vacuum tube, the glow of which is powered by a voltage proportional to the voltage on the primary winding of the x-ray tube transformer, and its anode current changes are used as the output signal of the anode current x-ray tube.

In tests, the X-ray generator showed reliable operation with instability in the order of 1-2%.

The proposed generator can be used in luminescent separators of minerals, where a high degree of stabilization of anode currents in X-ray tubes and their exact redistribution is required.

Fomula invention

X-ray generator containing

g two x-ray tubes with grounded anodes, a common source of high voltage, transformers of heat, stabilizers of anode currents of x-ray tubes, a circuit for dividing the total anodic current in the anode ground circuit into two

i components, each of which contains an anode current stabilizer sensor of one of the tubes and an electrically controlled resistance, a glow voltage sensor of one of the tubes, a nonlinear functional converter of the voltage sensor, a comparison circuit, to the inputs of which the output of the functional nonlinear converter and Anode current stabilizer sensor of one of the tubes, characterized in that, with

The goal of expanding the anode current control range, electrically controlled resistances in the total anodic current separation circuit are included in the balanced stage circuit, means for setting the working point of the balance stage are introduced into the generator, the output of the comparison circuit is connected to one input, and working points.

Sources of information taken into account in the examination

5 1- USSR author's certificate in accordance with the application L 2401501/25, cl. H 05 G 1/34, 1976. 2. USSR Copyright Certificate No. 2489684/25, cl. H 05 G 1/34, 1976.

Claims (1)

Foomula inventions An x-ray generator containing two x-ray tubes with grounded anodes, a common high-voltage source, glow transformers, anode current stabilizers of x-ray tubes, a circuit for dividing the total anode current in the anode grounding circuit into two 35 components, each of which contains an anode current stabilizer sensor of one of tube and electrically controllable resistance, voltage sensor filament of one of the tubes, the nonlinear function ₄₀ onal inverter voltage sensor signal intensity, comparison circuit, to the inputs of which the output of the functional nonlinear converter and the sensor of the anode current stabilizer of one of the tubes are connected, characterized in that, with the aim of expanding the range of regulation of the anode currents, the electrically controlled resistances in the separation circuit of the total anode current are included in the balanced cascade scheme, in the generator introduced means of setting the operating point of the balanced cascade, to one input of which the output of the comparison circuit is connected, and to the other - means of installing the working point. Sources of information taken into account during the examination