SU1332292A1 - Multipurpose high-voltage stabilizer - Google Patents

Abstract

The invention relates to electrical engineering and can be used in power supply devices for electronic equipment. The goal is to provide the possibility of obtaining an output voltage of different polarity, reducing the residual output voltage in the off state, and improving reliability. The connection of the source of the reference voltage through the switch 11 and the feedback amplifier 9 to the dividers 8, 10 and 14, 15 makes it possible to obtain the voltage of a different sign on the corresponding output buses without changing the polarity of the reference voltage source. The formation of a blocking voltage at the input of the regulating element 1 in the off mode ensures its active locking and reduces the residual output voltage. 2 hp f-ly, 1 ill. Output i (L with so yo output

Description

 The invention relates to electrical engineering and can be used in measuring installations.

The purpose of the invention is to provide the possibility of changing the polarity of the output voltage and disconnecting with a reduced level of residual voltage and low losses in this state,

The drawing shows a stabilizer circuit,

The stabilizer contains a regulating transistor 1 of the serial type, the collector of which is connected to the input terminal 2, and the base - to the first output of the detector 3 and the collector of the protection transistor 4, the base of which is connected to the emitter of the regulating transistor 1 and the first output of the protection transformer 5; connected to the second output of the detector 3, capacitor 6, output 7 and resistor 8. The second output of resistor 8 is connected to the inverting input of the DC amplifier 9 and resistor 10, the second output of which is connected to the common her tire. The electronic switch 11 has a first input 12, terminals for connecting a reference voltage source, and a second control input 13 are connected to it. The output of the electronic switch 11 is connected via a resistor 14 to the non-inverting input of the amplifier 9 and a resistor 15, the other output of which is connected to the second output of the capacitor 6 and the output 16 of the stabilizer. The output of the DC amplifier 9 is connected to the modulator 17 and the protection trigger indicator 18. A pulse generator 19 is connected to the second input of the modulator 17. The output of the modulator 17 through the capacitor 20 is connected to the input of the detector 3.

The stabilizer works as follows.

In the case of a positive polarity output voltage (output 16 is connected to a common bus), the feedback signal is fed through a voltage divider consisting of resistors, 8 and 10, to the inverting input, DC amplifier 9. The reference voltage is through a switch 11 connected by means of a control signal and a resistor 14 is fed to a non-inverting input of a dc amplifier 9. Voltage variation at the output is stabilized.

5 o

Q 5

five

0

five

Ra, for example, increasing it causes a decrease in the voltage at the output of the dc amplifier 9, while reducing the amplitude of the pulse signal at the output of the modulator 17, which is fed to. the input of the detector 3 through the separation capacitor 20, which carries out the galvanic i p of the high voltage part of the stabilizer from the low voltage part. Detector 3 rectifies and smoothes the pulse signal, decreasing which causes the control transistor 1 to turn off, reducing the output voltage to its original level. The capacitor 6 serves to close the variable component of the signal.

In the case of obtaining the output voltage of negative polarity (output 7 is connected to the common bus), the feedback signal is fed through the resistor 15. The rest is the same.

The protection circuit of the stabilizer against current overloads works as follows.

When the stabilizer is overloaded, the voltage drop across the resistor 5 increases, reaching the opening threshold of the transistor 4, which causes the control transistor 1 to close. The voltage at the output of the stabilizer decreases, the current is limited, which in turn causes a sharp increase in the voltage at the output of the amplifier 9 current, which is fed to the input of the protection response indicator. The overload indicator signals the presence of stabilizer overload. An increase in the voltage at the output of the DC amplifier 9 also causes an increase in the voltage at the output of the detector 3, which is trapped along the collector-emitter circuit of the open transistor 4 and does not affect the control transistor 1. When the overload is removed, the output stabilizer is set to voltage.

Thus, the construction of a high-voltage stub: a clipper requires only one high-voltage transistor, whose properties determine the main parameters of this stage. bilizer The absence of a ballast resistor increases the efficiency of the stabilizer. The presence of protection and induction of the stabilizer against overcurrent increases

stabilizer reliability. Switching the DC amplifier on via a differential circuit allows changing the polarity of the output voltage by connecting the corresponding pole to the common bus; in addition, the output of the stabilizer can be connected in series with other power sources. Using an electronic key, you can turn off the voltage regardless of the polarity at the output.

The stabilizer allows adjustment of the output voltage with a digital-to-analog converter. All this increases the range of application of the proposed stabilizer.

Claims (3)

1. A universal high-voltage voltage regulator containing a regulating transistor connected in series to the first power bus, a galvanic isolation node whose output is connected to the input of the regulating transistor, and the input to the output of the feedback amplifier, one of the inputs of which is connected to the middle an output voltage divider and terminals for connecting a voltage source, characterized in that, in order to provide the possibility of changing the polarity of the output voltage and disconnecting with a reduced voltage equal to the residual voltage and low losses in this state, an electronic key and divider are introduced into it eg Editor I.Nikolaychuk Order 3831/43 Circulation 863 Subscription VNIIPI USSR State Committee for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5 Production and printing company, Uzhgorod, st. Project, 4 one terminal of which is connected to the second power, the middle point is connected to the second input of the feedback amplifier, and the second is connected to the output of the electronic switch, the power input of which is connected to a terminal for connecting the voltage source, and a terminal for connecting a control unit, the galvanic decoupling unit being made on a modulator, a detector, two capacitors and a pulse generator, the output of which is connected to the first input of the modulator, the second input of which is an input of the galvanic unit The first terminal of the first capacitor is connected to the output of the modulator, and the other to the input the detector, the output of which is the output of the galvanic isolation node, the second capacitor is connected between the first and second power panels .. 2. The stabilizer according to the claim, in order to provide protection against overcurrent, a current sensor is inserted in it, connected in series to the first output bus, and a protection transistor, the base of which is connected to the emitter regulating transistor and one output current sensor, the emitter - with its other transistor, and the collector - with base of the control transistor. 3. The stabilizer according to claim 1, characterized in that, in order to provide an indication of the operation protection, entered the display unit, the input of which is connected to the output of the feedback amplifier. Compiled by V. Baranov Tehred L. Serdyukova Corrector E, Roshko