SU1501010A1 - High-voltage stabilized a.c. voltage source - Google Patents

Abstract

The invention relates to electrical engineering and can be used to stabilize high voltage alternating voltages. The purpose of the invention is to increase speed, increase reliability of operation and safety of operation. The power source contains a regulator (PO) 2, a power transformer 5 with a secondary 7 and an additional 8 windings. The secondary winding 7 sets the voltage on the control inputs of the voltage followers made on transistors 12, 13. The additional winding 8 through the power transitions of the transistors 12, 13, current sensor 22 and switching node 23 is connected to the output terminals. The output voltage replicates the voltage of the secondary winding 7, which, due to the small amount of current consumed, does not change as the load current changes. The feedback winding 9, galvanically isolated to the high-voltage output, is removed, proportional to the output voltage, which through the rectifier 10, the filter 11 and the feedback amplifier 3 is fed to the control input PO 2, ensuring the stabilization of the voltage transformer windings 5. In emergency modes, the load is disconnected by the switching node 23. 1 sludge.

Description

entrance

3,150

The invention relates to electrical engineering and can be used to stabilize high-voltage alternating voltage, for example, in installations dp of testing electrical strength of products.

The purpose of the invention is to increase speed, increase reliability and safety of operation.

The drawing shows an ele1 {triche scheme of a high voltage stabilized alternating voltage power source.

The power source contains the master generator I, the regulator 2, the feedback node 3, the source 4 of the reference voltage, the power transformer 5 with the primary 6, the secondary 7, an additional 8 windings and the winding 9 feedback, the rectifier 10, smoothing filter P, first 12 and second 13 control transistors, first 14 and second 15 current-limiting resistors, first 16, second 17, third 18, fourth 19, fifth 5 and sixth 21 diodes, current sensor 22, switching node 23 and security node 24 with memory.

The power source works as follows.

The master oscillator 1 generates a sine wave signal with a frequency of 50 Hz. The regulator 2 amplifies the signal from the output of the master oscillator i. The amplified signal from the output of the regulator organ 2 is fed to the primary winding 6 of the power transformer 5. At the terminals of the secondary winding 7, the auxiliary winding 8 and the feedback winding 9, sinusoidal voltages are generated.

The transformation ratios for each of the windings of the power transformer 5 are chosen, respectively, such that the voltage applied to the primary winding 6 from the output of the regulator organ 2 causes; on the winding 7, the formation of the output voltage level required from the power source; on the additional winding 8, a voltage that exceeds the output voltage of the winding 7 by the amount of voltage drop on the internal resistance of the additional winding 8 if the maximum load current flows through it; on the output of the winding 9 feedback - voltage, equal to after conversion /

nor by its rectifier 10 and the filter 11 to the voltage at the output of the source 4 of the reference voltage. When the power supply to the load is operating, the voltage on the first (from the output of the source 4 of the reference voltage) and the second (from the output of the filter 11) inputs of the feedback node 3 is maintained

automatically by adjusting the feedback of the gain of the regulator 2v by the signal from the output of the node 3.

Regulating transistors 12

and 13 are assembled voltage followers. In the normal operation of the source (when the output current of the source does not exceed the limit value), the switching unit 23 is closed.

When forming on the basis of the second. Rich winding 7 and additional 8. the positive half-wave winding in the ak; - the active mode operates the control transistor 12. The load current flows through the circuit: winding 8 - diode 16 - collector-emitter of the transistor 12 - current sensor 22 - switching node 23 - load - diode 19 - diode 21. On the load winding 7 voltage repeats (the direct voltage drop on the pn junctions is neglected. When forming positive half-waves at the ends of the secondary 7 and additional 8 windings in the active mode, the transistor 13 operates. The load current flows through the circuit: additional winding 8 - diode 17 - collector Mitter transistor 13 - load - ko.mmutatsii assembly 23 - 22, current sensor - diode

20. On the load, the voltage of the secondary winding 7 is repeated.

Negreby flowing through the winding 7 of the base current regulating transistors 12, 13, we can assume

that the winding 7 operates in the idle run mode and when the load current changes, the voltage on the winding 7, and consequently, on the load connected to the output terminals, remains unchanged. In this case, the voltage drop on the internal resistance of the primary winding 6 is compensated by a change in the output voltage of the regulator 2.

The feedback coil 9 functions as a voltage sensor.

Since, when the load current changes, the operating modes of the secondary winding 7 and the feedback winding 9 are retained 515

c, the relation between the voltage levels formed on them is also preserved. This allows controlling the voltage of the secondary winding 7 and, therefore, the voltage on the load according to the magnitude of the voltage on the winding 9 reverse, and thus galvanically unleashing the high-voltage and low-voltage parts of the power supply.

The voltage at the output terminals does not change with an increase in the load current until the voltage on the additional winding 8 decreases due to the voltage drop on its internal resistance to the level of the voltage of the winding 7. Therefore, the voltage of the additional winding 8 in idle mode the stroke should be equal to the open circuit voltage of the secondary winding 7 by the amount of voltage drop on the internal resistance of the additional winding 8 when the maximum load current flows through it,

In order to prevent the output of the strap-controlling transistors 12 and 13 when a load current occurs in the load circuit, the current sensor 22 and the switching unit 23 are turned on. In the event that the load current exceeds a certain value under the influence of the signal from the current sensor 22, the protection device 24 operates. In this case, the switching unit 23, under the influence of a signal arriving at its control input from the output of the protection unit 24, breaks the circuit of the passage of the load current.

The technical and economic effect of the implementation of the invention is to increase the speed of the source, which eliminates the dips and surges of the output voltage and thereby improve the quality of the high-voltage tests carried out with the help of the power source. The galvanic isolation of the high-voltage windings with the low-voltage part of the power source makes it possible to increase the reliability of its operation and the safety of operation.

Claims (1)

Invention Formula A high voltage stabilized alternating voltage power source containing a regulator with a power input connected to the input terminals and an output to the primary  , 0 5 about Q 0 five 106 the winding of the power transformer, the beginning of the secondary winding of which is connected to the common point of the first and second diodes serially connected, the end of the secondary winding of the power transformer is connected to the common point of the third and fourth diodes sequentially connected, the output connected to the first input regulator, the second input of which is connected to the output of the feedback node, the nepBbtfi input of which is connected to the reference voltage source, a current sensor, the output connected to by the protection node, which differs with the fact that, in order to increase speed, increase reliability of operation and safety of operation, five and sixth diodes, the first and second regulating transistors, the first and second current-limiting resistors, the optimizer, smoothing f51pstr, are introduced into it , switching unit, additional winding and feedback winding of a power transformer, while the feedback winding of a power transformer through a rectifier and a smoothing filter is connected to the second input of the feedback node, the beginning of the The additional voltage is transmitted through the fifth diode, the collector-emitter junction of the first control transistor, the current sensor and the coupling unit are connected to the first output terminal, the end of the auxiliary winding through the sixth diode and the junction collector-emitter terminal of the second control transistor are connected to the second output terminal, the base the first regulating transistor through the first current limiting resistor is connected to the beginning of the secondary winding, the base of the second regulating transistor through the second current limiting resistor is connected to the end of the secondary winding, the emitter of the first regulating transistor through the first and second diodes connected in the forward direction is connected to the start of the auxiliary winding, the emitter of the second regulating transistor is connected to the ends of the additional winding in the forward direction, the output of the protection node is connected to the control switching input, the number of turns of the additional winding is determined from us715010108 catching the formation on its outputs the propriety of the voltage drop on the internal operation of the power transformer, in the resistance of the additional voltage on the voltage of the transformer, the pre-winding of the maximum running load current through it, on the terminals of the secondary winding