SU1511744A1 - D.c. voltage stabilizer - Google Patents

Abstract

The invention relates to electrical engineering and can be used in sources of secondary power supply of communications equipment, automation and telemechanics, as well as electrical systems. The purpose of the invention is to improve the noise immunity and accuracy of the protection against emergency operation. To achieve this goal, an emitter follower 13, a damper 14, an overcurrent protection transistor 15, a blocking diode 23, 1.22 first and second executive elements, an overvoltage protection transistor 20, an output transistor 17, DR are added to the stabilizer. 16, 18. In the event of a short-circuit or voltage overloads at the outputs of the divider 11, repeater 13 and the first output of the damper 14 do not change. At the second output of the damper 14, the voltage decreases, the transistor 15 opens, the regulating element 2 closes. During overvoltage at the output of the stabilizer, the voltage at the base of the transistor 17 increases, and the voltage at its emitter does not change. The transistors 17 and 20 open, the second actuator 22 turns on, shunt the load, the transistor 15 opens, the control element 2 closes, the power from the load decreases. 2 Il.

Description

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31511744

The invention relates to electro | technology and can be used in sources of secondary power supply of communication equipment, automation and remote control, as well as in electrical systems.

The aim of the invention is to improve the noise immunity and accuracy of the emergency protection operation.

Fig, 1 shows a diagram of the proposed device; in fig. 2 is a damper circuit,

The voltage stabilizer (fig, I) contains a first actuator 1 connected in series, which can be used, for example, a fuse, a regulating element 2, a DLC filter 3, a current overload sensor 4 and a load 5, a 6-dv modulator, From the time of the master circuit 7 and the transistor 8, the output is connected to the input of the regulating element 2, and the input is connected via the first resistor 9 to the output of the 10 DC amplifier, outputted as a differential amplifier, divider II output ngment I to the input second terminal and whose collector via a third resistor 2 is connected to. the input of the second executive element 22 connected in parallel to the load 5, Blocking diode 23. The anode is connected to the connection point of the 4-current overload sensor and the load 5, and the cathode is connected to the second output of the damper 14, the collector of the overload protection overload through the limiting resistor 9 is connected to the base of the transistor 8 modulator 6 long

15 and forms with it the trigger protection scheme.

The damper 14 (Fig, 2) can be performed, for example, in the form of serially connected low-pass filter 24 and high-pass filter 25, with the output of low-pass filter 24 connected to the base of transistor 15 for protection against overcurrent and filter output 25 high pass is connected to its zmitter.

The device works as follows;

In normal operation in the absence of a short circuit, overload

20

the voltage is connected through the sensor 4 current to 30 and the output voltage is within the limits of a given norm, the overload protection transistor 15 and the protection transistor 17 are closed-out and the voltage regulator performs its functions to provide the load five,

In the event of a short circuit or overcurrent, the voltage on the output voltage divider 1-1 remains unchanged. The voltage at both outputs of the zmitter follower 13 and, consequently, at the input of the damper does not change either.

14 and on its first exit. The voltage on the current overload sensor 4 increases, which leads to a decrease in voltage at the load 5 and at the second output of the damper 14, the transistor

15, the short-circuit and overcurrent protection opens up and opens the transistor 8 of the modulator 6 of duration, blocking the time of the driver circuit 7 and closing it

An overload is connected parallel to the load 5, the output is connected to the input of the amplifier 10 of the direct current, the second input of which is connected to the first output of the source 12 of the reference voltage, 35 the second output of the source 12 of the reference voltage is connected to the input of the emitter follower 13, the first independent the output of which is connected to the input of the damper 14, the power supply of the node 13 can be carried out from the second input of the first actuator 1, the first output of the damper 14 is connected to the base of the transistor 15 protection against overload current, and the second output is connected 45 to e of the emitter. The DR circuit 16 is connected by one output to the connection point of the current overload sensor 4 and the output voltage divider II, and the other output is connected to the second output of the emitter follower 13, the protection transistor 17 is not connected to the output voltage by a base-emitter junction connected in parallel with the resistor 50

o

I to the input terminal, and the collector through the third resistor 2 is connected to. the input of the second actuator 22 connected in parallel to the load 5, Blocking diode 23. The anode is connected to the connection point of the sensor 4 -current overload and load 5, and the cathode is connected to the second output of the damper 14, the collector of the transistor 15 overload protection through the limiting resistor 9 connected to the base of the transistor 8 of the modulator 6

5 and forms with it a trigger protection scheme.

The damper 14 (Fig, 2) can be performed, for example, in the form of serially connected low-pass filter 24 and high-pass filter 25, with the output of low-pass filter 24 connected to the base of transistor 15 for protection against overcurrent and filter output 25 high pass is connected to its zmitter.

The device works as follows;

In normal operation in the absence of a short circuit, overload

0

PN 18 DR chains 16, and the collector through jjjadjusting element 2, Voltage

the second resistor 19 is connected to the base of the stabilizer output drops still

matching transistor 20, emitter more, which leads to further

matching transistor 20 connection-opening of the transistor 15 protection against

chen through the first executive short circuit and overload on

current and the transistor 8 of the modulator 6 duration, thereby finally closing the regulating element 2, the blocking diode 23 prevents the occurrence of residual voltage on the load 5.

Overvoltage at the output of the stabilizer increases the voltage at the midpoint of the DR circuit 16, i.e. on the basis of the output voltage protection transistor 17, while the voltage across its emitter remains fixed. The transistor 17 opens, opens the matching transistor 20, in turn turns on the second actuator 22, thereby shunting the load 4. This leads to the opening of the short-circuit protection and overcurrent and locking of the regulating element 2 and disconnecting the load 5 from the power supply network,

If an overvoltage occurs at the output of the stabilizer as a result of the failure of the regulating element 2, the overvoltage protection transistor 17 turns on the second control element 22, which leads to the forced burning of the fuse 1 and the disconnection of the load 4 from the supply network.

The damper 14 (Fig, 2) works as follows

When the device is turned on in the network for the duration of transients, the low-pass filter 24 keeps the transistor 15 for protection against short-circuits and current overloads in the closed state and enables the output to the voltage regulator mode. In the case of high-frequency switches of the regulating element 2 and the load 5 in the closed state, the transistor 15 is protected against short circuits and current overloads. 25 high pass filter.

Claims (1)

Thus, the expansion of functionality in the proposed device increases the noise immunity and accuracy of protection and ensures more reliable operation of the entire device. Invention Formula DC Voltage Stabilizer, Consistently Connected Control Element, DLC Q h 0 5 o d 0 five filter and current overload sensor, duration modulator, the outputs of which are connected to the control and to the power input of the regulating element, and the input, through the first resistor, to the output of the DC amplifier, the power inputs of which are connected to the power input of the regulating element and to the common bus, the first input - to the first output of the voltage source, and the second input - to the output of the output voltage divider, the first input of which is connected to the common bus, the current transistor overload protection, the second and third resistors, I distinguish This is due to the fact that, in order to increase the noise immunity and accuracy of the emergency protection operation, two executive elements, an emitter follower, a damper, a blocking diode, a matching transistor, a protection transistor, were introduced: 1 output voltage, a DR circuit, the first actuating element is connected to the power input of the regulating element by the output, and the input to the input and to the first power input of the emitter follower, the second power input of which is connected to the common bus, the input to the second output of the source the reference voltage, the first output to the input of the damper, the power input of which is connected to the common bus, and the outputs to the emitter and to the base of the overload protection transistor, the collector of which is connected to the output of the DC amplifier, the blocking diode is connected between the emitter transistor overcurrent protection and output terminal, the second actuator power inputs connected to the output terminal and to the common bus, and the input through the third resistor - the collector of the matching transistor, the emitter of which is connected to the power the input of the regulating element, and the base, through the second resistor, to the collector of the protection transistor against overvoltage of the output voltage, the emitter of which is connected to the free output of the DR circuit resistor and to the second output of the emitter follower, and the base to the connection point of the diode and the DR resistor , the free output of the diode. which is connected to the connection point of the DLC filter with the load current neper sensor and to the second input of the divider the output voltage, moreover, the stroke of the low pass filter is connected to the damper is made in the form of a successor-base transistor protection against overheated connected lower frequency filters for current, and the output of the upper filter and a high-pass filter, and you-frequencies are connected to its emitter, O / p perbogo V (small. Id