SU575638A1 - Current stabilizer - Google Patents

Description

one

The invention relates to the field of electrical engineering and can be used in equipment that requires a stabilized current at high voltages on the load and when the load resistance changes in a wide range. In particular, this current stabilizer can be used in measuring and testing equipment for avalanche-transit diodes or zener diodes.

It is known a device in which a dual control system is applied, in which a current regulator is supplied that maintains Constant load current l. In order to keep the voltage regulator transistor at a constant current constant, an automatically controlled constant voltage source is used.

The disadvantage of such a stabilizer is the complexity of the circuit.

The closest to the invention to the technical essence and the achieved result is a current stabilizer containing a current-stabilizing element on the Tpaitzistor, the collector of which is through the load

connected to one of the outputs of the source of the collector voltage, and the emitter to one of the outputs of the source of the emitter current 2j.

The disadvantage of such a current stabilizer is that the range of permissible and: load resistance variations is limited by the maximum permissible voltage of the collector junction of the transistor.

The purpose of the invention is to expand the range of load resistances and increase the reliability of the stabilizer.

Claims (2)

This goal is achieved by the fact that a current repeater containing a current-stabilizing element on the transistor, the collector of which is connected via a load to one of the outputs of the collector voltage source and the emitter to one of the outputs of the emitter current source, is equipped with an additional transistor of the opposite type npt capacity, while the base transistors are connected to each other, the collector of the additional transistor is connected to another output. the source of the collector voltage, and the emitter - to another output of the source: :) mntt ()) go -i-oK.i, ii also 1 PM, which is aral of the KOJi / u KTOp base of the rpiiHl igors of the current-stabilizing element is included additional resis; tori. FIG. Figure 1 shows the functional circuit of the current stabilizer on two transistors; in fig. 2 - the same, on two composite transistors. In the current stabilizer, transistors 2 and 3 are turned on as the current stabilizing element 1, the emitters of the transistors are connected to the source 4 of the emitter current. The collector of transistor 2 is connected via a load 5 to the negative terminal of the source 6 of the collector voltage. Additional resistor 7 is connected parallel to the collector junction of transistor 3, since the output characteristics of this transistor pass below the characteristics of transistor 2. Transistor 2 is used without an additional resistor since its connection deteriorates the stabilization factor. The emitter current source 4 includes a transistor 8, stabilizers 9 and 1O, resistors 11 and 12. The input 4 is connected to the output of a constant voltage source 13. Fig, 2 shows a current stabilizer circuit with a higher stabilization factor. The emitter current source 4 does not differ from that shown in FIG. 1. Transistors 14 and 15 form a composite transistor 2, and transistors 16 and 17 form a composite pnp transistor 3. The stabilization factor of a current regulator is determined by the slope of the output characteristic of a current: a stabilizing electron & cop. The minimum slope of the characteristic is obtained when the output characteristics of the transistor are maximally close. For composite transistors, the current gain factor approaches unity. At the same time, the output characteristics of the transistors approach each other, and the stabilization factor of the current stabilizer increases. The advantage of the current regulator, shown in FIG. 1 is the simplicity of the scheme. The described current stabilizer can be used in measuring and testing equipment for avalanche -control diodes or for zener diodes with njJuoiiBJibiMH lay) / K1: || inmn. In life, such a GTA6N11.;). 1TO | This is similar to that in (- / beater for testing avin-1111 diodes for reliable operation. The advantage of this stabilization; wiping is in providing a stabilized DCI load current when the voltage of the multi-source source is more than the maximum permissible granisistor voltage and with zero load resistance. Run A stabilizer on one transistor is not possible, and the solution of this problem with the help of other devices is possible only with the use of much more complicated circuits. An effect that can be obtained as a result of using The problem lies in the possibility of applying simple current stabilizers in radio installations where the load resistance can vary widely. More complex current stabilizers will be more expensive and cumbersome. Invention 1. The current stabilizer containing a current-stabilizing element on a transistor, collector which through the load is connected to one of the outputs of the source of the collector voltage, and the emitter - to one of the outputs of the source of the emitter current, about the fact that, in order to Iren range nagrueki resistances tokostabili iruyuschy element is provided with an additional transistor of the opposite conductivity type, the bases of transistors connected to each other. Additional collector transistor - Connected to a different output of the collector voltage source, and emitter to a different output of the emitter current source. 2. The current stabilizer according to claim 1, characterized in that, in order to increase reliability, additional resistors are connected parallel to the A-or-base transitions of the current-stabilizing cell transistors. Sources of information taken into account in the examination: 1.Book, ed. Dodik S.D. and Galperina E.I. Sources of power supply on semiconductor devices-, M., Sov.radioG, 1969, p. 199, fig. 111.21. 2.Kniga Spiridonova N.S. Basics of the Theory of Transistors, Kiev, 1969 p. 112-118. // eight 9 Yu