SU1335959A1 - D.c.voltage stabilizer - Google Patents

Abstract

The invention relates to electrical engineering and can be used to power electronic equipment. The purpose of the invention is to increase reliability by ensuring the alignment of the currents of the control transistors in Dynamic mode. The implementation of the goal is facilitated by the introduction of a current-setting // into the device circuit (L 00 00 SL with SL CO

Description

dvu.popusnika 7, connected to the emitters equalizing 6,1-6-6.N. The output of the amplifier is 10.

one

The invention relates to electrical engineering and can be used to power electronic equipment.

The purpose of the invention is to increase the reliability of the stabilizer by ensuring the alignment of currents of parallel-connected control transistors and in a dynamic mode.

Fig. 1 is a schematic diagram of a DC voltage stabilizer for the case where the regulating transistors are switched on with collectors to the input terminal; in FIG. 2, the same, when the control transistors are switched on with collectors to the output.

The constant-voltage stabilizer contains measuring node 1, Ы of control transistors 2.1-2, N, as well as N emitter resistors 3.1-3, N and N of base resistors 4.1 - 4.N, transistor matrix 5 of N leveling transistors 6.1-6.N and a current-supply two-port 7. Measuring and amplifying node 1 contains a source 8 of the reference voltage, a divider 9 of the output voltage, and an amplifier 10 of the error signal.

In the circuit of FIG. 1, the control transistors 2.-2, N are connected by collectors to the input terminal 11, and emitters through the resistors 3.1-3.N to the output terminal 12, to which the additional power source 13 is connected, from which feeds the source 8 of the reference voltage, the amplifier 10, as well as the collector circuit of the matching transistor 14. The two-terminal 7 is made on the resistor 15 and is connected by one output to the point 16 of the emitter combination of the transistors of the matrix 5, and the other output is to the common output of the stabilizer 17. Elements B , 10 and 14 are part of chip 18,

In the circuit of FIG. 2, the control transistors 2.1-2.N are connected to the error signal collector connected to the common point of the base resistors 4.1 - 4.N. 2 Il.

frame to the output terminal 19, and emitters through the emitter resistors 3.1-3, N - to the input terminal 20. In this circuit, a resistor 21 and a serial additional power source 22 are used as a two-pole 7.

The stabilizer of FIG. 1 operates in the following manner.

The output voltage is stabilized by comparing a portion of the output voltage at the output of divider 9 with the voltage of source 8 of the reference voltage, amplifying the received error signal by amplifier 10 and acting through a matching transistor 14 and resistors 4.1-4, N

transistors 2.1-2.N, whose resistance is changed in such a way as to reduce the change in output voltage caused by the disturbance.

In this scheme, the current from the output of the matching transistor 14 splits into N branches formed by resistors 4.-4, N, ToK of each resistor 4.1-4.N is further divided into two parts:

the part flows into the base of the corresponding control transistor 2, -2, N, the other part flows through the collector-emitter junction of the corresponding transistor 6.1-6, N of the matrix 5. The emitter 3.1-3.N have the same resistance values.

In the absence of scatter of the parameters of transistors, the currents through all resistors 4.1-4.N are the same, the currents through

all bases of transistors 2.1-2.N are the same, the collector currents of transistors 6.1-6, N are also equal.

If, for example, transistor 2.1 has a minimum base-emitter voltage and a maximum current gain, transistor 2.2 has a maximum base-emitter voltage and a minimum gain factor

current, and trans: isa mountain 2.3-2.N - gap 1e of these parameters, then with this combination of parameters, the current through the transistor 2.1 tends to increase, the current through the transistor 2.2 - to decrease, which leads to an increase in the voltage drop resistor 3.1 and voltage reduction across resistor 3.2.

As a result, a higher voltage is applied to the base of transistor 6.1, and a lower voltage to the base of transistor 6.2, which leads to an increase in the collector current through transistor 6.1 and to a decrease in current through transistor 6.2, which increases the voltage drop across resistor 4.1 and the voltage across the resistor 4.2 decreases, which in turn leads to a decrease in the voltage (and therefore current) applied to the base of transistor 2.1, and an increase in the voltage (and current) to the base of transistor 2.2.

Therefore, the circuit prevents an increase in the collector current of transistor 2.1 and a decrease in the collector current of transistor 2.2, i.e. unequal division of currents through parallel control transistors.

The response of the individual transistors 6.3-6.N depends on what current value the transistors 2.3-2.N approach to them, if more than the average value of the current through one control transistor, then the currents of the transistors corresponding to them 6.3-6.N increase, increasing the voltage drops on the corresponding resistors 4.3-4, N, which leads to a decrease in the currents of the corresponding transistors 2.3-2.N. Those transistors 2,3-2.N, the current through which tends to a smaller current than the more harmful value, receive the effect of the corresponding transistors D.3-6.N, preventing the reduction of their currents. In this way, the currents of the transistors 2.1-2.N are equalized.

The uneven distribution of currents between parallel regulating transistors is determined by the unevenness of voltages at the base-emitter junction of transistors 6.1-6.N, which using a transistor matrix containing in one case

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The transistors, which are designed for one process and from one source material, are reduced to very small values (on the order of a few millivolts).

Resistor 15 is selected so that the current through it is sufficient to compensate for the most unfavorable combination of parameters of transistors 2.1-2, N.

In the stabilizer circuit of FIG. 1, an additional power supply 13 is used, which contributes to the improvement of the efficiency of the stabilizer due to the reduction in the minimum required voltage drop between the input 11 and the output 12 of the stabilizer. At the same time, the presence of resistors 4.1-4.N does not increase the power loss in control transistors 2.1-2.N.

Composite transistors are used as control transistors 2.1-2.N. Resistor 15 in principle can be connected not only to the total output of the stabilizer 17, but also to any additional power source whose potential is lower than the potential of the output positive output of the power bus of the stabilizer 12.

In the embodiment of the DC voltage regulator circuit of FIG. 2, the control transistors 2.1-2.N of the pn-type conductivity are connected by collectors to the output terminal 19, forming a negative output voltage stabilizer. In this scheme, the measuring-amplifying node 1 of the output voltage stabilization circuit ensures the stabilization of the output voltage by changing the amount of current flowing from the output of the amplifier 10. The equalization of the currents of 2.1 - 2.N transistors is carried out similarly to that considered for the circuit in FIG.

Both circuits are economical, since, due to the small difference in the base-emitter junction voltage between the transistors 6.1-6.N of matrix 5 (for example, about 3 mV), the emitter resistors 3.1-3.N can be chosen such that the voltage drops across them consequently, the power loss would be small (for example, on the order of 30 mV with 10% current unevenness). Stabilizer circuits have a high response rate when the load current changes abruptly, as the mismatch signal caused by a disturbance.

amplified by a DC amplifier 10 and a matching transistor 14, is applied simultaneously to the bases of all control transistors 2.1 - 2, N, and two-port 7 provides the necessary current through transistors 6.1-6, N.

In comparison with the known device, the proposed device provides for equalizing the currents of the regulating transistors not only in the static mode, but also in the dynamic mode when the stabilizer is turned on or when the load current increases abruptly

Claims (1)

Claims of the Inverter DC Voltage Stabilizer Containing N Regulating Transistors Connected In Parallel With Each Other Through The Emitter And Base Resistors And The Connected Collector Editor V. Danko Compiled by V.Esin Tehred V.Kadar Order 4046/42 Circulation 863 Subscription VNIIPI USSR State Committee for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5 Production and printing company, Uzhgorod, Proektna, 4-smitter circuits between the input and output pins, the error amplifier, the output of which is connected to the bases of the regulating transistors, and the inputs are connected to the reference voltage source and the output voltage divider N leveling transistors, the emitters of which are combined, and the collectors and bases are connected to the bases and emitters of the respective control transistors, characterized in that, in order to increase reliability by providing equal In addition to current control transistors and in dynamic mode, a current-supplying two-port circuit is connected to it, connected to the emitters of the equalizing transistors, and the common connection point of the base resistors is connected to the output of the error signal amplifier. Proofreader A.T. sko