SU1206761A1 - D.c.voltage stabilizer - Google Patents

Description

2. The stabilizer according to claim 1, wherein the actuator is made on an electromagnetic relay with make contacts connected in series with the pressure throttle.

3. The stabilizer according to claim 1, characterized in that, in order to increase noise immunity, between the base of the protection transistor and the first

The invention relates to electrical engineering and can be used in the design of power sources for electrical and electronic equipment for various purposes.

The aim of the invention is to increase reliability and efficiency and reduce the volume and mass of the stabilizer.

The drawing shows a voltage regulator circuit.

Voltage stabilizer contains saturation choke 1 with control winding 2, comparison element 3 connected to the output terminals, DC amplifier 4, output connected to the base of control transistor 5, the collector circuit of which is connected to control switch 6 consisting of a transistor 7 and an actuator 8, for example, an electromagnetic relay with shorting contacts 9, included in the collector circuit of transistor 7 of switching unit 6, as well as overcurrent protection node 10 and short circuits, which includes protection transistor 11 and matching transistor 12, protection transistor base 11 through the first cut, source 13 is connected to the collector of control transistor 5, protection transistor 11 collector resistors 14 and 15 are connected to the base of the matching transistor 12, the collector of which is connected to the base of the transistor 7 of the switching node 6, and between the midpoint of the second and third

206761

resistor included integrating RC-chain.

4. A stabilizer according to claim 1, characterized in that, for the purpose. reducing the time of readiness for reclosing; a resistive voltage divider and a decoupling diode are additionally introduced, the middle point of the voltage divider being connected via a decoupling diode to a time delay capacitor.

The resistors 14 and 15 and the emitter of the matching- transistor 12 include a time delay capacitor 16.

In order to increase the noise immunity 5 and smooth the ripples of even harmonics induced in the saturation throttle 1 control winding 2, between the base of the protection transistor 11 and the first resistor 13 an integrating 0 RC chain consisting of resistor 17 and capacitor 18 is turned on.

In order to discharge the capacitor 16 time delay after the protection node has triggered and decrease its ready-to-turn-on time 5, a resistive voltage divider on resistors 19 and 20 and a decoupling diode 21 are added, the middle point of the divider being 0 21 is connected to the capacitor 16.

The power part of the stabilizer, in addition to saturation 1 throttles, also includes a variable-voltage-to-constant converter, consisting of a series-connected transformer 22, a rectifier 23, and a filter 24.

The collector circuits of transistor 0 and 7 include collector resistors 25 and 26, and threshold elements such as diodes 27 and 28 can be included in their base circuits, which serve to provide complete and reliable locking of these transistors.

The control transistor 5 can also be made composite.

The power supply of the control unit, in particular the chain consisting of an adjustable 31

of the driving transistor 5 and the winding 2 of the control of the droplets 1 on the base, is 1 emitted from the output voltage of the stabilizer or from the auxiliary voltage of the capacitor connected to the supply network after the contacts 9 of the electromagnetic relay 8.

The proposed voltage regulator works as follows.

The stabilizer on command via the resistor 25 is supplied to the base of the transistor 7 of the switching node 6. The transistor 7 is open, the actuator 8 - the electromagnetic relay - and the supply voltage through the normally open contacts 9 is applied to the saturation inductor 1 and then through the transformer 22 to the rectifier 23 and the filter 24. From the output of the stabilizer, the voltage goes to its output pins and to the input of the element 3 comparison. From the output of the comparison element 3, the error signal through the direct current amplifier 4 is fed to the base of the regulating transistor 5, by means of which the current in the control winding 2 is established to stabilize the output voltage of the stabilizer. During normal operation of the stabilizer, the control transistor 5 is in a linear mode and the base of the protection transistor 11 is diode 28 and the resistors 13 and 17 are supplied with the collector voltage of the control transistor 5. The resistances of the resistors 13 and 17 are chosen such that during the stabilizer's normal operation, the protection transistor 11 is in the satin mode, as a result, the matching transistor 12 is locked and the capacitor 16 is discharged.

In case of overcurrent or short circuit in the load circuit, the voltage drop on the internal resistance of the stabilizer increases, the voltage on the inductor 1

Compiled by S.Gorbachev Editor V.Ivanova Tehred A.Babinets Corrector S.Shekmar

Order 8711/49 Circulation 837 Subscription VNIIPI USSR State Committee

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

Branch PSh1 Patent, Uzhgorod, Proektna St., 4

06761

reduced to a minimum and the stabilizer exits stabilization mode. In this case, the error signal at the output of the comparison element 3 and the amplification of the direct current body 4 increases dramatically and the control transistor 5 goes into saturation mode, the protection transistor 11 is locked and the capacitor 16 starts charging through resistors 26 and 14. The resistances of the resistors 19 and 20 are selected so that in the presence of a voltage command to turn on the decoupling, diode 21 is always locked. When the voltage J5 on the capacitor 16 reaches the value at which the voltage at the emitter-base junction of transistor 12 corresponds to its open state, it opens, and transistor 7 closes and de-energizes the winding of the electromagnetic relay 8, which opens its contacts 9 and disconnects the stabilizer from supply network. After the current protection node trips, the transistor 11 is closed, the matching transistor 12 is opened by the current, flowing through the resistors 26, 14 and 15, and the transistor 7 is closed. When the turn-on command is removed, the decoupling diode 21 is opened and the capacitor 16 is discharged through the diode 21 and the resistor 20, and the discharge time of the capacitor 16 is selected several times smaller than the time constant of its charge.

20

25

thirty

35

From the foregoing, it is clear that the capacitor 16 serves to temporarily delay the operation of the protection node, in particular to prevent it from tripping when the stabilizer is turned on, and during its short-term current overloads. This delay is not dangerous for a throttle stabilizer, since all the elements in its power circuit withstand short-term current overloads with large multiplicity.

Claims (4)

1. A DC VOLTAGE STABILIZER, comprising a saturation inductor with a control winding, a comparison element connected to the inputs with output terminals, and an output to a DC amplifier input connected to a base of a control transistor, in the collector circuit of which a control coil of a saturated inductor is connected J niya, and an actuator connected in series with the saturation reactor, characterized in that, in order to increase reliability and efficiency and reduce volume and mass, a switching unit on a transistor is introduced into it, the collector circuit of which includes an actuator and an overload protection unit overcurrent and short circuit consisting of a transistor and the protection transistor matching, the protection transistor base through a first resistor connected to the collector of said regulating transistor, the collector _of protection transistor through n consequently ® Tel'nykh included second and third resistors connected to the base of the matching transistor having its collector connected to the base of transistor switching unit, and the midpoint between the second and third resistors and the emitter of the matching transistor included time delay capacitor. 2. The stabilizer according to claim 1, characterized in that the actuating element is made on an electromagnetic relay with make contacts, connected in series with the throttle choke. 3 '. The stabilizer according to claim 1, characterized in that, in order to increase the noise immunity, between the base of the protection transistor and the first T206761 resistor included integrating RC-chain. 4. The stabilizer according to claim 1, characterized in that, in order to reduce the readiness for reconnection, a resistive voltage divider and a decoupling diode are additionally introduced, the midpoint of the voltage divider through a decoupling diode connected to a time delay capacitor.