SK82011A3 - Circuit to evaluate the loss of superconductivity of superconducting magnet - Google Patents

Abstract

The circuit for evaluating the superconducting loss of a superconducting solenoid comprising a derivation circuit (10) equipped with an input (11) connected via a signal of the required current to a transducer-controlled superconducting solenoid, the output of the derivatized circuit (10) being connected to the input of the electrical separation circuit (20), the output of which is connected to the input circuit (21) of the reading circuit (30), the second input (51) of the reading circuit being connected to the output of the differential amplifier (50) via a signal proportional to the total voltage on the superconducting electromagnet (43), the input of which is coupled to the output of a commutation switch (40), which one input (41) is connected to the electromagnets of the transducer magnet and the second input (42) is connected to the control via a commutation signal, wherein the output of the subtracting circuit (30) is connected to the input (31) of the comparator circuit (60), wherein its further input (71) being connected to the output of the reference circuit (70) via a reference voltage level, wherein the output of the comparator circuit (60) is connected to the input (61) of the memory circuit (80), which output is a fault signal associated with the control.

Description

Circuit for evaluation of superconductivity loss of superconducting electromagnet.

Technical field

The present invention relates to a superconducting electromagnetic loss superconducting loss evaluation circuit providing a superconducting loss signal in the superconductivity loss, which is used as an auxiliary signal in the immediate demagnetization of the superconducting magnet in order not to destroy it.

BACKGROUND OF THE INVENTION

At present, in most cases, a superconductivity evaluation circuit is solved either on the galvanic side associated with the superconducting magnet, or on the control side, by electrical isolation separated from the superconducting magnet.

The disadvantages of the old state when used in switched power supplies when the superconductivity evaluation circuit is located on the galvanic side associated with the superconducting magnet is that the derivative circuit is relatively highly noisy by the power portion of the switched power supply, and ensuring proper operation is complicated. In the case where the control and hence the superconductivity evaluation circuit are separated by electrical insulation from the superconducting magnet, it is a disadvantage that the necessary analog signals which are on the superconducting magnet side are to be transmitted via electrical insulation to the control side.

SUMMARY OF THE INVENTION

The above-mentioned drawbacks and disadvantages are eliminated from the constructional point of view and eliminated by the technical solution according to the invention namely superconducting electromagnetic loss evaluation circuit with a control side derivative circuit and other circuits on the superconducting electromagnet side where the derivative circuit is provided with input connected via the required current signal. to a superconducting electromagnet with converter control, wherein a derivative circuit output that generates a voltage value proportional to the induced voltage on the superconducting electromagnet is coupled to an electrical circuit input whose output is proportional to the inductive voltage signal connected to the subtraction circuit input, via a signal proportional to the total voltage on the superconducting electromagnet, coupled to the output of the differential amplifier, the input of which is connected to the output of the commutation switch to which one input is connected to the superconducting magnet terminals through the total voltage on the electromagnet, and the other input is connected to the control via a commutation signal, where the output of the subtraction circuit is connected to the comparator circuit input, the other input is connected to the reference circuit output via the reference voltage level. wherein the comparator circuit output is coupled to a memory circuit input whose output is a fault signal associated with the control.

The main advantage of a superconducting electromagnetic superconducting electromagnetic loss evaluation circuit is that connecting the control side derivative circuit and other circuits to the superconducting electromagnet side eliminates the problem of ensuring the proper operation of the derivative circuit and leaving the other circuits on the conductive side of the superconducting electromagnet. .

Overview of the figures in the drawing

In the attached drawing of FIG. 1 is a schematic diagram of a superconducting electromagnetic loss superconductivity circuit

DETAILED DESCRIPTION OF THE INVENTION

The technical solution according to Fig. 1 has been successfully implemented and applied in power sources produced in EVPÚ a.s. Specifically, the PS140-8 power supplies.

The derivative circuit 10 is provided with an input 11 coupled via a desired current signal to a superconducting electromagnet with converter control, wherein the output of the derivative circuit 10 is connected to the input 12 of the electrical compartment 20, the output of which is connected to the input 21 of the subtraction circuit 30. The second input 51 of the subtraction circuit 30 is connected via a signal proportional to the total voltage on the superconducting electromagnet, to the output of the differential amplifier 50, whose input 43 is connected to the output of the commutation switch 40, one input 41 connected to the superconducting magnet terminals. input 42 is coupled to control via a commutation signal. The output of the subtraction circuit 30 is coupled to the input 31 of the comparator circuit 60, its other input 71 being coupled to the output of the reference circuit 70 via a reference voltage level. The output of the comparator circuit 60 is coupled to the input 61 of the memory circuit 80, the output of which is a fault signal coupled to the controller.

The analog voltage signal corresponding to the desired current through the superconducting magnet enters the input 11 of the derivative circuit 10, which derives its current from its current, a physically induced voltage value at the superconducting solenoid terminals, provided the desired and actual current is output from the derivative circuit 10 applied to the input 12 of the circuit of the electrical compartment 20, the output of which is connected to the input 21 of the subtraction circuit 30. The second input 51 of the subtraction circuit 30 is connected to a differential amplifier 50 output via a signal proportional to the total voltage on the superconducting electromagnet, whose input 43 is connected to the output of the commutation switch 40, one input 41 connected to the superconducting magnet terminals. The second input 42 is connected to a control via a commutation signal, which maintains the same sign of the total voltage at the input 51 of the subtraction circuit 30 when the current direction through the superconducting electromagnet is changed and the total voltage changes. the difference between the total and the induced voltage value, which is actually the voltage value at the ohmic component of the superconducting electromagnet, is coupled to the input 31 of the comparator circuit 60, its other input 71 being coupled to the reference circuit output 70 set to a reference level that defines the interface between the ohmic resistance an electromagnet which is still considered a level corresponding to superconductivity and resistances, which is already considered a loss of superconductivity. The output of the comparator circuit 60 is coupled to the input 61 of the memory circuit 80, which at the output 81 keeps the fault signal in a fault condition until it is canceled by the operator. The fault signal is coupled to the control so as to disconnect the superconducting solenoid from the power supply in the fault condition by means of a power element and to rapidly demagnetize it to prevent destruction of the solenoid.

Industrial usability

The technical solution according to the invention relates to a wide range of applications in the field of superconducting electromagnets, mostly for scientific purposes, where superconducting magnets are required to be suppressed in the loss of superconductivity caused, for example, by insufficient cooling or current overload.

Claims (1)

PATENT CLAIMS A superconducting electromagnetic superconducting electromagnetic loss evaluation circuit comprising a derivative circuit (10) provided with an input (11) coupled via a desired current signal to a superconducting electromagnet with a converter control, wherein the output of the derivative circuit (10) is coupled to an electrical isolation circuit input (12). (20), the output of which is connected to the input (21) of the subtraction circuit 30, the second input (51) of the subtraction circuit (30) being connected to the output of the differential amplifier (50) via a signal proportional to the total voltage on the superconducting electromagnet; ) is connected to the output of a commutation switch (40), one input (41) of which is coupled to the superconducting magnet terminals via the total voltage on the electromagnet, and the other input (42) is coupled to a commutation signal control, (30) is coupled to an input (31) of the comparator circuit (60), wherein its further The other input (71) is coupled to the output of the reference circuit (70) via a reference voltage level, wherein the output of the comparator circuit (60) is coupled to the input (61) of the memory circuit (80), the output of which is a control signal.