SU1251045A1 - Pulsed heteropolar d.c.voltage stabilizer - Google Patents

Abstract

The invention relates to stabilized power sources. The aim of the invention is to improve the reliability of a constant voltage switching regulator by providing protection against overcurrent and short circuits. The goal is achieved by introducing into the transformer circuit with primary 15 and 16 and secondary 17 and 18 windings, transistor switches 19 and 20, trigger 21, trigger keys 22 and 23, delay circuits 24 and optocouplers 25 and 26. Scheme 24 is necessary to ensure reliable launch device. In case of an accidental failure in operation, the trigger 21 automatically switches to the oscillator mode and again brings the circuit to the nominal operating mode. In the case of a short circuit on both outputs, the storage capacitors and 2 are discharged and the optocouplers 25 and 26 are activated. This causes the otSoHx transistor switches 19 and 20 to be locked, which provides protection. 1 il. c (L SL 4 SL

Description

The invention relates to electrical engineering and can be used in power supply devices designed to power various electronic devices with differential load, requiring two different polarity power sources with a common bus, in particular integrated operational amplifiers and some types of microprocessors,

The purpose of the invention is to increase reliability by providing protection against current overloads and short circuits.

The drawing shows a diagram of a pulsed stabilizer of different voltage fields.

The stabilizer contains two storage capacitors 1 and 2, two resistances 3 and 4, two sensitive elements 5 and 6, two sources 7 and 8 of the reference voltage, two switching diodes 9 and 10, two summing elements II and 12, two comparators 13 and 14 The storage capacitors 1 and 2 of the resistors 3 and 4 of the load, the sensitive elements 5 and 6 and the sources 7 and 8 of the reference voltage are interconnected in pairs in series 5 and each of the resulting circuits is connected in parallel to the outputs of the KMnyabdHoro stabilizer. The common points of the elements interconnected in series are connected and connected to the common bus of the output voltages. The cathode of the switching diode 9 is connected to the output of a positive polarity, and the anode of the switching diode 10 to the output of a pulsed stabilizer of negative polarity. The inputs of the sources of the reference voltage and. sensitive elements are connected through summing elements 1 and 12 to the inputs of the respective comparators 13 and 14. In contrast to the prototype, the device contains a power transformer with two primary 15 and 16 and two secondary 17 and 18 windings, two transistor switches 19 and 20, a switching control trigger 21, triggering keys 22 and 23, a delay circuit 24 connected in parallel with the input of the pulse stabilizer, switching optocouplers 25 and 26.

Output winding 17 is connected between the anode of the switching diode 9 and

510452

common 11 and the second output winding 18 is connected between the common bus output voltage and polarity of the switching cathode

5 diode 10. The common point of the first 15 and second 16 input windings of the power transformer is connected to the positive input of the pulse stabilizer, and the other ends of the input windings

0 through transistor switches I9 and 20 are connected to the external source case. The inputs of the transistor switches 19 and 20 are connected to the corresponding outputs of the switchable control

5 trigger 21. The first two inputs of this trigger through the trigger keys 22 and 23 are connected in parallel to the input of the pulse stabilizer, the second inputs of the trigger 21 are connected via

0 switching optocouplers 25 and 26 to

the outputs of the comparators 13 and 14, respectively.

In a pulsed stabilizer, the common point of the output oppositely polarized voltages is developed with an external source casing, and if necessary, these points can be connected.

Impulse stabilizer works as follows.

 At the first time point, the delay circuit 24 provides for unlocking of the starting transistors 23 and 22, which switch the control three; trigger 2 in autogenerator mode

5 work. The auto-oscillations (alternate unlocking and locking of the transistor switches 19 and 20) that occur in the circuit cause the appearance at the input windings 15 and 16 of the power transformer of the alternating square voltage alternating voltage transformer, which is converted into the alternating voltage at the output windings 17 and 18 of the power transformer. VyPr low voltage

45 through switching diodes 9 and 10

enters the storage capacitors 1 and 2 and the resistance 3 and 4 load. Output voltages of positive and negative polarity

0 are measured by sensitive elements 5 and 6, compared with the voltages of the reference sources 7 and 8 in elements II and 12. From the latter, the signal corresponding to the excess

55 running voltages of stabilization levels, goes to the comparators 13 and 14, which work every time when the voltage to the drive3

capacitors exceeds stabilization level.

The signals from comparators 13 and 14 are fed to optocouplers 25 and 26., which provide switching, controlling the trigger from the mode of the autogenerator to the mode of the trigger and its subsequent switching. Let at some point in time the switchable control trigger 21 is in such a state that the transistor switch 19 is open and a current flows through the input winding 15 of the power transformer, which induces a current in the output winding 17 and provides a charge for the storage capacitor at the stabilization level, and after operation of the optron 25, the switchable control trigger is transferred to a new stable position. In this case, transistor switch 19 is locked, and transistor switch 20 is unlocked, and a current flows at the input winding 16 of the transformer, which induces a current in the output winding 17. This current provides a charge for the storage capacitor 2 to a stabilization level, which triggers

the optocoupler 26 and the transfer switchable trigger 21 in a new stable position, etc.

A delay circuit 24 is necessary to ensure reliable output of the circuit to the nominal mode. From its output at the first moment after switching on, signals are sent to the driving transistors 22 and 23, which switch the trigger 21 to the auto-oscillator mode. Then the delay circuit and the starting transistors do not affect the operation of the pulse stabilizer. In case of accidental failure. Due to interference and interference, the switchable control trigger automatically switches to the autogenerator mode, again brings the circuit to the nominal operating mode and again switches to the trigger mode.

In the event of a short circuit on both outputs, the storage capacitors 1 and 2 are discharged and the optocouplers are activated, they are locked and this causes both transistor switches 19 and 20 to be locked, thus providing short circuit protection.

ju 20 5

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5 0 5 0

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Output voltages can be adjusted.

In the proposed pulse stabilizer, deep negative feedback is implemented, which allows stabilizing the output voltages under the influence of destabilizing factors and asymmetrical load changes, and provides protection against short circuits and current overloads. The invention also allows for the isolation of the resulting bipolar output voltages from an external power supply case, i.e. any additional voltage source can be switched on between the common busbar voltage difference and the external source case, which expands the possibilities of using the proposed pulse stabilizer.

In addition, in the proposed device, electromagnetic compatibility is improved due to the separation of output voltages, which allows obtaining the required amplitude of high-frequency ripple output -.- voltages with smaller dimensions of output filters by 10%.

Claims (1)

Invention Formula A constant voltage pulse voltage regulator containing two storage capacitors, two sensitive elements, two reference voltage sources connected in series and through switching diodes in parallel to the polarized outputs of the pulse stabilizer, the common points of the series-connected elements are combined and connected to the total voltage of the different polarities of the pulse stabilizer, and the outputs of the sensitive elements and sources of the reference voltage through The corresponding summing elements are connected to the inputs of the respective comparators, characterized in that, in order to increase reliability by providing protection against overcurrent and short circuits, a power transformer with two primary and two secondary windings, two transistor switches, two switching optocouplers are inserted into it, two triggering keys, a delay circuit, a switchable control trigger, with the output windings of the power transformer connected in series, and their common connection point not the output voltage of the pulse stabilizer, the second output of the first output winding is connected to the anode of the first switching diode, and the second output of the second output winding is connected to the cathode of the second switching diode, while the first transistor switch and the first input winding of the power transformer are connected in series, as well as second transistor Editor E. Kopcha Compiled by S. Gorbachev Tehred E. Chizhmar Proofreader M. Maksimishinets Order 4410/44 Circulation 836 Subscription VNRSHPI State Committee of the USSR for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab ,, d.4 / 5 Production and printing company, Uzhgorod, Projecto st., 4 The key and the second input winding of the power transformer are connected in parallel to the input of a switching regulator, and the bases of transistor switches are connected to the outputs of a switched control trigger, the first inputs of which are connected to the outputs of a delayed j connected in parallel to the input of a switching regulator, and the second two inputs of a switching control the trigger is connected to the outputs of the respective optocouplers 5 whose inputs are connected to the outputs of the corresponding so-called comparators.