SU693355A1 - Dc voltage stabilizer - Google Patents

Description

single input unbalanced trigger. The pa is connected to the output of an injected resistive voltage divider, the inputs of the source connected to the input terminals, and the output of the asymmetric trigger is connected to the base of the inputted transistor, the emitter of which is connected to the common source bus, and the polarizer is connected to the entered OR circuit, on three diodes connected, respectively, to prohibiting inputs of the power supply unit, including the element. The gauges of the sensor are zagged and. source. TAMi sensors.

The drawing shows a power supply circuit with protection, J stouch contains a power supply unit 1, an output connected to the load and simultaneously to the input of the protection sensor 2. To protection sensor under-. Switches are also elements. 3 on dates of the protection switch, the display element 4 and the power supply unit 5 of the protection sensor /. , R. Resistive voltage divider .- consists of series-connected resistors 6; 7, 8, of which the resistor 7 is a potentiometer connected to the input. OUTS of the source and the input of the voltage regulator 9,: consisting of sequentially on: -. resistor 10 and. zener diode - 11 total points of which, connected to the transistor base with. 12, the output of stabilizer 9 is connected to the supply circuits of the asymmetrical trigger .13 with 3 MITs on the VT side or -V:. The output of the resistive divider (the slider of potentiometer 7) is connected to the input amp and the trigger - the base of its trans. 14, the emitter of this transistor together with the emitter of transistor 15 through a resistor 16 is connected to ONE power supply of the trigger. The collector of the transistor 14 is connected to the base of the transistor 17 emitter repeater and via two / subsequently connected load resistors 18 and 19 .- to the other power transistor. the trigger trigger, for .. ta; 1k go is connected to the collector of transistor 17 and resistor 20. of transistor 17 through a chain made up of Parallel wylyyyyyyhryzys-

Torah 21 and Condensator 22, sub-. It is connected to the base transistor 15 and through a resistor to the power of the trigger circuits. . . :.:. ;

General The load resistors B 18 and 19 are connected to the base of the composite transistor R 24, which consists of transistors 25 and 26, and the transistor 25 is an input. The emitter of this transistor is connected to the base of transistor .26 and through a resistor 27 to the common source bus, to which the emitter of the transistor 26. is also connected. The collectors of transistors 25 and 26 connected to each other are connected to the common point of three diodes

8, 29, 30 circuits OR (cathodes of diodes), rotationally opposite in the arches of which are connected to the selling inputs, respectively. naturally - power supply unit 1, ele- The power-on concept of the 3. protection and. stechnik ...;

The source works as follows. - j.

At the normal level, the voltage of the eti (when the value of 1 exerts on its voltage is within the specified limits) is not. The symmetric trigger 13 is located in the initial state. The state is characterized by the conductivity of the transistor 15 and the closed state of the transistor 15. 14. The current through the resistors-18 and $ 1 does not pass and therefore the voltage on the base of the transistor 17 is equal to the voltage of the junction. him, the collector, Since this; Tra.nzistr works in the mode of emitter follower, gda. its sivftiTTeba is close to the voltage at its base |, i .e. there is no minus of the primary network. The transistor 15 is in the state of being connected at the expense of a resistor 21 from the emitter of the transistor. 17 to the base of the transistor 15./The base current .-; .. the composite transistor 24 is absent. The use of an emitter follower in the Trigger enabled the absence of a base-to-base current. go transitra 15. Transistor ..14 -.-. closed as a result of the effect on the base-emitter transition of the sum of two voltages, of which the first is the voltage difference between the voltage divider section from the slider of potentiometer 7 to the minus of the primary network and the output of the stabilizer 9, and the second is the fall of the voltage resistor 1.6 due to the current of the transistor 15. .7 ..:

  When the network voltage drops to uroin, when the voltage at the base of transistor 14 becomes lower than the voltage across the erd emitter, the voltage is relative to the minus of the primary network), transistor 14 opens and the flip-flop trips. Transistor st. 15 is generated as a result of a change in voltage on the collector of transistor 14 and, accordingly, the emitter of transistor 17, the base-emitter junction voltage of transistor 15 will have the polarity inverse to the conductivity of this transistor) and its magnitude is close to falling on the same resistor 16 arising on it due to the current of the transistor 14.

Through the stabilizer 9, the resistor 16, the transistor l4 and the resistor 18 to the base of the transistor 25 will go current, which will cause the opening of both transistors of the composite transistor and their saturation. Now transistor 26 under

Claims (2)

.- - “ra -ri: turns on the common point of the OR diodes to the minus of the primary network, as a result of which the power supply unit 1, block 5 and protection switch-on element 3 are blockingly closed through the transistor 26 and the corresponding OR diode the wire of each of these devices, as a result of all they stop working. Power supply unit 1 is turned off, and the protection element is turned on to return to the initial state, so that on subsequent switching on (when the mains voltage level is sufficient), the protection is again delayed by the time the power supply unit goes into nominal mode. The block 5, which supplies the protection sensor, is turned off, which will exclude the operation of the latter, and therefore the issuance of alarms to the element 4 indications when the power supply unit 1 is turned off. The tilting threshold of the trigger is regulated by potentiometer 7. Thus, an asymmetrical trigger inserted into the power source prohibits the operation of its power supply unit 1, the protection sensor 2 and the display element when lowered; the voltage level of the primary network is lower than the permissible value. When the supply voltage decreases, unit 1; In any case, the power supply will be turned off by the protection sensor gene, since its output voltage may drop to the threshold of the protection sensor activation at the minimum minimum load. but when the alarm indication appears, as it was shown earlier, is false, the Trigger turns off the power supply even before the output voltage of power supply 1 deviates from the nominal value and begins to tend to the protection sensor response threshold. Claims of the Power Supply with Protection, containing a power supply, output under, connected to the load and to the first input of the protection sensor by the maximum and minimum voltage, the second input of which is connected to the output of the protection sensor enable element, the third, the input to the output of the power supply the protection sensor, the output of the safety sensor is connected to the input of the display element, the inputs of the specified power supply unit, the activation element of the protection sensor and the power supply of the protection sensor are connected to the input terminals of the source, for the purpose of excluded | cheny false alarms and. full off when reducing and failing the voltage of the primary network below a predetermined level / into the power source, a voltage stabilizer is introduced, the input is connected to the input terminals of the source, and the output is connected to the supply circuits of the introduced unbalanced trigger with an emitter follower, and the common wire of the trigger is connected to output bus voltage regulator opposite to its common bus, the control input of the non-symmetric trigger connected to the output of the input resistive voltage divider, the inputs connected to the input the source pins, and the unbalanced trigger output is connected to the input of the input composite transistor, the Kotoporo emitter is connected to the common source bus, and the collector is connected to the OR circuit, on three diodes connected, respectively, to the prohibiting inputs of the power supply, sensor activation element protection and source power sensor protection. Sources of information taken into consideration in the examination 1. The author's certificate of the USSR 460541, class, G 05 7 1/58, 1973 .: 2.Pirogov, F.I., Power supply control system of radio equipment on semiconductor logic elements. Radio electronics questions, Series OT, Issue 21, 1969, .0. 95-ilQ.