SU1206759A1 - D.c.voltage stabilizer - Google Patents

Description

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

The aim of the invention is to improve the dynamic characteristics of the stabilizer under a pulsed load.

FIG. 1 is a schematic diagram of a stabilizer; in fig. 2- transient curves at the output of the stabilizer.

The constant voltage regulator (Fig. 1) contains a current-stabilized two-port 1 connected between the input 2 and the output 3 of the stabilizer. The divider 4 of the output voltage is connected by its input to the output 3 of the stabilizer, and the output is connected to the first input 5 of the amplifier 6 of the error signal. The second input 7 of the error signal amplifier 6 is connected to the output of the source 8 of the reference voltage. The output of the error signal amplifier 6 is connected to a regulating transistor 9, the collector of which is connected to the stabilizer output 3, and the emitter is connected to a common bus 10. The emitter-base transition of the control transistor 11 is connected parallel to the emitter-base transition of the regulating transistor 9, the collector control transistor

11 is connected to the base of the power transistor 12 and the source output 13

, the current, the input of which is connected to the output 2 of the stabilizer. The emitter of transistor 12 is connected to output 3, and the collector to input 2 of the stabilizer.

The load capacitor 14, together with the correction circuits of the error signal amplifier 6, ensures stable operation of the stabilizer.

Instead of a bipolar transistor

12 composite transistors can be used. A resistor or more complex circuits can be used as the current-stabilizing bipolar 1. Powerful output transistors of stabilizers in semiconductor integrated design are implemented as a parallel connection of several low-power transistors with current-leveling resistors of low resistance in the emitter circuits. therefore

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The control transistor 11 in the semiconductor version of the microcircuit is one of the sections of the power transistor with a different collector connection, which simplifies the technological implementation of the device.

The stabilizer with the pulsed nature of the load current works as follows.

In the initial period of time after a jump-like increase in the load current, the collector current of the output control transistor does not decrease and, therefore, the current at the output of the stabilizer retains its minimum value of 3 ", .."

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0 (aOv, 0). This is due to the inertia of the feedback channel (the error signal amplifier), which is particularly evident in the presence of correction capacitors. The change in current and load is due to the discharge of the capacitor 14 load. In this case, at the initial moment of time, the discharge current of the capacitor is equal to LOC 3 c. , Then, with a certain delay, the output control transistor 9 closes and, due to a decrease in its collector current, the current at the output of the stabilizer 3i increases. It should be noted that the discharge of the load capacitor occurs until a current increment at the output 3 of the stabilizer is close to uJ n max. In order to maintain the output current level close to 3 and to provide a load capacitor charge in the output circuit, the stabilizer for a certain period of time to ensure the increment of the output current AZru, ld3 H-Mai c. In this case, the difference between the currents AZ; - n. MSTX is the charge current of the load capacitor 14. Since even with full locking of the output control transistor LZ., 3

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then charge current

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the capacitor 14 load (. max. mich is determined by the minimum current of the collector circuit of the output regulating transistor. If the minimum collector current of the output regulating transistor 9 is selected, based on the provision of high efficiency, then O,. d ,,: ". .

3

Thus, if no special measures are taken, then the discharge of the capacitor of the load at the first moments of time is carried out by the current LZ., O.,.

nn max

and charge (.after closing the day off

control transistor) is produced by the current.

Therefore, the variable voltage of the stabilizer is relatively slow to the steady-state value (Fig. 2, curve 1).

Fast charging of the load capacitor and thereby reducing the duration of the transient process is provided by the control transistor 11, the transistor 12 and the current source 13. As long as the control transistor 9 is in active mode, i.e. a current flows in its collector circuit, and the control transistor 11 is in active mode. The output current JB of the current source 13 flows through the collector circuit of the control transistor 11 and the transistor 12 is closed (in the cut-off mode). As soon as the regulating transistor 9 is closed, it switches to the cut-off mode and the control transistor 11. At the same time, the output current 3g of the current source 13 enters the base of transistor 12 and opens it. In the output circuit 3, a stabilizer appears before the thinning agent (8k

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Compiled by V. Esin Editor V. Ivanov Tehred A. Babinets

59, L

The TOKauD j ,, magnification of the base current of the transistor 12. This additional increment of the current forces the charge of the load capacitor 14 and reduces the duration of the transient process (Fig. 2, curve 2). With an abrupt decrease in the load current, the transient at the output of the stabilizer proceeds relatively

quickly, since in this mode the regulating transistor (works for unlocking) is able to provide large changes in the output current in

transient modes.

The advantages of the proposed device are due to the fact that due to the sharp decrease in the transient time and the first release

The quality of output voltage stabilization under a short-term impulse load is significantly increased. This makes it possible to increase the reliability of the operation of high-speed electronic equipment, which may malfunction due to long transients in the power supply circuits. In addition, an improvement in the dynamic characteristics of constant voltage stabilizers makes it possible to reduce the requirements on the isolation circuits of the functional units of the equipment for power supply.

Fig2

Proofreader S. Shekmar

Order 8711/49

Circulation 837

VNIIPI USSR State Committee

for inventions and discoveries 113035, Moscow-, Zh-35, Raushsk nab., 4/5

. Branch PPP Patent, Uzhgorod, st. Project, 4

Subscription

Claims (1)

A DC voltage stabilizer containing a current-carrying two-terminal device and a power transistor connected in parallel between the input and output terminals, a regulating transistor connected by a collector to the output terminal, an emitter to a common bus, and a base to the output of the error signal amplifier, the input of which is connected to a reference voltage source, a current source, one output of which is connected to the base of the power transistor, characterized in that, in order to improve the dynamic characteristics of the stabilizer with pulsed load by reducing the first output and the duration of the transition, it is entered the control transistor _with the connected base-emitter circuit JS parallel to the base-emitter circuit regulating transistor and the collector to the base of power transistor whose emitter is connected to the output terminal and whose collector - to the input terminal and to another terminal of the current source. Figure 1 <ί 1206759