SU1249498A1 - Versions of d.c.voltage stabilizer - Google Patents

Abstract

The invention relates to electrical engineering, in particular to power supplies of various electronic equipment. The purpose of the invention is to increase the efficiency of the device. In the steady-state mode, the load current is provided by the first regulating transistor 1 and the first current-stabilized two-pole device 2. The switching transistor 6 is in the inverse mode. The current of the second current-stabilizing two-terminal 3 is small. In a transient mode, transistor 1 is closed by a signal from the amplifier 7 of the error signal, transistor 6 is in the forward mode. The current of the second control transistor 5 increases. The capacitor 11 is discharged, the amplifier 7 converts the transistor 6 to the inverse mode. Transistor 1 opens and transitions from a higher output voltage level to a lower one. In the second version of the device, another connection of the two-terminal 3 provides a reduction in the power dissipated on it. 2 sec. item f-ly, 2 ill. (С (Л to ;; со N со 00 Fig.2

Description

The invention relates to the group of chromphemes and can be used to power electronic equipment.

The aim of the invention is to increase the efficiency of the device.

FIG. 1 shows an electrical circuit of a constant voltage regulator according to the first embodiment; in fig. 2 - the same, according to the second option.

The voltage regulators contain the first regulating transistor 1 pnp-type, the first current stabilizing two-pole 2, the second current-stabilizing two-pole 3, resistor 4, the second regulating transistor 5 pnp-type, the switching transistor 6 pnn-p- type according to the first variant and pnp-type according to the second option, the error signal amplifier 7, the reference voltage source 8, the output voltage divider 9 with output 10, the output correction capacitor 11, the input 12 and output 13 outputs and the common bus 14.

In the first embodiment (Fig. 1), the collector of transistor 1 is connected to pin 12, and the emitter to pin 13, the emitter of transistor 6 and the first pin of resistor 4. Divider 9 and capacitor 11 are connected between pin 13 and the total length 14. Output 10 divider 9 is connected to the inverting input of amplifier 7, the non-inverting input of which is connected to the source 8 of the reference voltage. The output of amplifier 7 is connected to the base of transistor 5 and the second output of two-pole 3, the first output of which is connected to the base of transistor b and the second output of resistor 4. The collector of transistor 5 is connected to common line 14, and the emitter to the collector of transistor b, base of transistor 1 and through the first two-terminal 2 - to the input terminal 12. According to the second variant (Fig. 2), the n-pn-type transistor 6 is connected by a collector to the output 13, an emitter to the emitter of the transistor 5, the base to the output 13 via the two-terminal 3, and the output of the amplifier 7 through a resistor 4.

The constant voltage stabilizer operates as follows.

In the steady-state mode, the difference between the output voltage of the stabilizer and the voltage at the output of the amplifier 7 is equal to the difference between the voltages at the base-emitter transitions, respectively, of the first O 1 and second 5 transistors and is the fraction of a volt. Therefore, the amount of current flowing through the two-port 3 is small. Transistor 6 in steady state operates in inverse mode; its emitter current is small and has almost no effect on the emitter current of transistor 5, which in this case is determined by the base current of transistor 1 and the current of the two-pole network. At the same time, the current in the load is provided by transistor 1.

During a transient process caused, for example, by a decrease in the magnitude of the reference voltage, the output amplifier 7 generates a control signal leading to a change in the polarity of the base-emitter voltage and the closure of transistor 1. Transistor b changes from inverse to direct operation. The base current required to open the transistor b is provided by the second two-port 3. The current of the transistor 5 increases dramatically. The capacitor 11 is discharged by the current flowing through the transistors b and 5.

As soon as the voltage of the capacitor 11 reaches the new setpoint, the amplifier 7 converts the transistor b to the inverse operation mode and the transistor 1 to the amplification mode. In this way, a transition from a higher level of stabilized voltage to a lower one is made.

With an abrupt increase in the load resistance (the pulsed nature of the current consumed), the voltage at the output of the stabilizer first increases and then quickly decreases to its original value. This case, by the nature of the processes occurring in the stabilizer, is similar to the case considered of a decrease in the magnitude of the reference voltage.

In the proposed variants of the DC voltage regulator, because the base current required for controlling the conductivity of the switching transistor flows only during the transient process, the power dissipation of the second current-stabilizing two-pole device is reduced, which improves the efficiency of the device.

Claims (2)

1. DC voltage regulator containing the first regulating transistor pnp-type, connected to the input collector, emitter - to the output pins, the base through the first two-terminal current stabilizer, to the collector, output correction capacitor, divider of the output voltage, second The ppp control transistor, the collector of which is connected to the common bus, the emitter to the base of the first regulating transistor, and the base to the output of the error signal amplifier, the inverting input of which is connected to the output d output voltage, and non-inverting input - to the source of the reference voltage, the switching transistor ppn-type and the second current-stabilizing two-pole, the first output of which is connected to the base of the switching transistor ppp-type, characterized in that in order to increase efficiency, a resistor is inserted in it, the first terminal of which is connected to the output terminal. and the second output is connected to the pnp type switching transistor, the emitter of which is connected to the output, and the collector to the emitter of the second regulating transistor, and the second output of the second current stabilizing bipolar circuit is connected to the output of the error signal amplifier. 2. DC voltage regulator containing the first regulating transistor pnp-type, connected to the input collector, emitter - to the output pins, the base through the first current-stabilizing two-terminal circuit to the collector, output correction capacitor, divider of the output voltage , the second regulating pnp-type transistor, the collector of which is connected to the common emitter core - to the base of the first regulating transistor, and the base to the output of the error signal amplifier, the inverting input of which is connected to the output of the output voltage divider, and the non-inverting input to the source of the reference voltage, the switching transistor pnp-type and the second current-stabilizing two-terminal, and the collector of the switching transistor The pn-type is connected to the output terminal, the emitter is connected to the base of the first regulating transistor, and the base is connected to the first output of the second current-stabilizing two-port device, characterized in that, in order to increase the efficiency, resistor is led, the first end connected to the output of the amplifier and the second output - to the base of the switching transistor is an n-p-n type, the second terminal of the second two-pole tokostabiliziruyuschego connected to the output terminal.