SU798763A2 - Dc stabilizer - Google Patents

Description

one

The invention relates to electrical engineering and is intended to be used in the power supply circuits of various electronic equipment.

According to the main author. St. No. 479097 is known for a DC stabilizer containing an adjustable DC source connected by one of the terminals to an output terminal, connected in series to the output circuit an inductance coil, in the magnetic field of which a sensitive element of a superconducting quantum-magnetic interferometer is placed. the output of the latter is connected to the input of an adjustable DC source. The disadvantage of this device is not high enough, the stability of the output signal.

The purpose of the invention is to increase stability.

This goal is achieved by the fact that the DC stabilizer is equipped with a superconducting switch connected between the reference current source and the additional winding inductively introduced, and both windings are placed in the inserted shield, which, like the additional winding, is made of superconducting material.

The use of a superconducting switch and a superconducting primary winding of a comparator makes it possible to create a superconducting closed ring, which has the property of retaining the magnetic flux coupled to it for an indefinitely long time.

0 The coupling of the current flowing through a ring with a magnetic flux is realized through the inductance of the ring, which is not difficult to make the necessary magnitude and stability. The storage of the current of the reference source in the primary winding is performed by shorting its leads with a superconducting switch when current flows through the winding. Posting winding com

Claims (1)

In the superconducting screen, the paratrooper eliminates the magnetic core and therefore the magnetic noise associated with it. The use of a superconducting screen instead of a ferromagnetic core is made possible by the fact that the Meissner – Oxenfeld effect takes place in superconductors, the essence of which is manifested in pushing the magnetic field out of the volume of the superconductor. Therefore, when placing conductors with a current inside the superconducting screen, then on its surface, it is equal to the algebraic sum of the currents covered by the given surface. Thus, the coefficient of mutual induction between the turns of the windings inside the screen and the zero magnetic flux indicator is ensured. Thus, while maintaining in the primary winding a certain amount of constant current, unambiguously associated with the current value of the reference source, it is possible to turn off the reference source and, consequently, increase the stability of the device. The drawing shows a DC stabilizer. The stabilizer contains primary 1 and secondary 2 windings with outlets inside the superconductive screen 3, a magnetic flux indicator 4, an adjustable current source 5, a superconductor Etz switch 6 and a reference DC source 7. Clips 8 and 9 are used to supply the output current to the load, and clips 10 and I1 are designed to be removed from the resistor 12 if it is necessary to obtain a stable voltage. Winding 1 and 2 together with the screen 3 form a DC comparator 13. Comparator 13 may have a different design, for example, in the form of a bundle of wires placed in a long tube of superconducting material, which acts as a screen 3. To control the sensitivity of the comparator 13, the tube is swiveled in the form of a solenoid inductively coupled to the null indicator 4. In order to create windings 1 and 2, the taps of the beginning and end of the respective wires of the harness are connected in series, and to form the primary winding 1 Wires made of superconducting material, such as niobium, are used, and the comparator 13 is placed in an environment with a temperature below the critical temperature of the superconductor, for example, at a temperature of liquid helium. Parts of a superconducting switch b, made according to the scheme shown in the drawing, and a superconducting quantum interference device 4, which is a superconducting ring containing one or several Josephson junctions, are located in the same medium. The reference DC source 7 can be made using a thermostated resistance measure and a thermostatically controlled normal element with an amplifier. power, or voltage measures based on the Josephson effect. The device works as follows. When the switch 6 is in position a, the current of the reference source 7 enters the primary winding 1. The current in the secondary winding 2 is created by an adjustable current source 5. If the difference between the ampere turns of the primary 1 and the secondary 2 windings is not zero, a current is induced on the surface of the screen 3 1, which creates a flow acting on the null indicator 4. Yule indicator 4 changes the current of the controlled source 5 so that the magnetic flux F becomes zero, when ETO1L the ampere turns of windings 1 and 2 are equal: -. where 3, and, and p and p the number of turns of the primary 1 and secondary 2 windings, respectively. Thus, the output current of the device is defined as the product of the input current versus the number of turns of the primary winding 1 to the number of turns of the secondary 2, the output voltage at the terminals 10 and 11 will be equal to the product of the current per resistor 12. When the switch 6 is in position cG winding 1 short-circuited, a superconducting ring is formed, the magnetic flux of which remains unchanged in time. In this case, the following relation takes place: V - oCi / -r / where Zs is the value of current in the primary winding before the closing, value of the current in the primary winding after closing; primary winding inductance; switch inductance It should be noted that when the switch of position a switches to position b first, winding 1 short-circuits and then source 7 is disconnected. Thus, after closing the primary winding 1, it maintains a certain amount of direct current d which is uniquely related to the value of the reference current source, thereby allowing the current source 1 to be completely disconnected. In this mode of operation, the stability of the output current and voltage is increased, due to the absence of ripples, noises and interferences and connecting the primary winding 1 and the reference source 7. Performing the windings 1 and 2 of superconducting material also improves the accuracy of the transfer of the current value from the reference source 7 by eliminating DC leakages between the turns, since the resistance of the wires windings 1 and 2 will be zero, which is infinitely less than any non-zero insulation resistance. An increase in the accuracy of the device is provided by the use of a superconducting screen 7 for equalizing the coefficient of induction between windings 1 and 2 and the null capacitor 4. In order to obtain high stability and accuracy, a superconducting quantum interference device is used, and the type of construction of these devices can be different , for example HF-magnetometer, PT-magnetometer. Invention Formula DC stabilizer auth. St. W 479097, characterized in that, in order to increase stability, it is equipped with a superconducting switch- connected between a reference current source and an additional coil of inductance introduced, and both windings are placed in an inserted screen, which like the additional winding is made of superconducting material . Sources of information taken into account in the examination 1. USSR author's certificate 1 479097, cl. G 05 F 1/46, 1973.