SU1197024A1 - Stabilized voltage converter - Google Patents

Abstract

A STABILIZED VOLTAGE CONVERTER containing a key stage, the output of which is connected via a voltage multiplier and a smoothing filter to the Vr-. an output terminal and a common bus, an adjustable low-voltage source, an operational amplifier whose first input is connected to a common bus, and the second input is connected to a voltage source directly and through a feedback resistor - with an output terminal In order to improve noise immunity under the conditions of pulsating interference, the adjustable low-voltage source is double-ended and an inverting operational amplifier is introduced, with the total output A voltage source is connected to the common bus, the key stage is connected between its positive and negative terminals (Relative polarity, the output of the operational amplifier is connected to the input of the inverting operational amplifier and the first control input of the adjustable voltage source, and the output of the inverting operational amplifier connected to its second control input.

Description

The invention relates to electronic technology and can be applied to power photomultiplier tubes, photo cells, transmitting television tubes, etc.

The purpose of the invention is to improve the noise immunity of the device under the influence of pulsating noise.

FIG. 1 shows a block diagram of the device; in fig. 2 - its basic scheme.

The device (Fig. 1) contains an operational amplifier 1, the first input 2 of which is connected to the common bus, and the second output 3 is connected to the first control input 4 of a two low-voltage adjustable low-voltage source 5 directly and through an additional inverting operation b - with a second control input 7 of a constant voltage source 5. The output 8 of the positive polarity and the output 9 of the negative polarity of the source 5 are connected to the inputs 10 and 11 of the key stage 12, respectively. The output 13 of the key stage 12 through the node 14 multiplying and filtering the DC voltage is connected to the output terminal and via the feedback resistor 15 is connected to the second input 16 of the operational amplifier 1, to which the source 17 of the reference voltage is also connected. Inverting ushshtel 6 has a unit transfer ratio

A bipolar regulated low voltage source 5 (Fig. 2) is provided on control transistors 18 and 19 of various types of conductivity, which are controlled by operational amplifiers 20 and 21, respectively. Starting the voltage source 5 when supplying the input voltage is produced through a resistor-diode circuit 22-25Key cascade 12 is executed according to a one-stroke scheme and contains a master oscillator 26, a key transistor 27 and a powerful transformer 28. The oscillator 26 can be designed as B conventional multivibrator,.

and a blocking generator with a profitable transformer ..

The device works as follows.

After switching on to the mains supply, the non-inverting inputs of the operational amplifiers 20 and 21 of node 5 through the resistor-diode circuits 23-23 receive trigger signals, as a result of which the key stage 12 starts to work, and a high voltage is released at the output of node 14. Operational: Amplifiers 1 and 6 produce control signals to inputs 4 and 7 of node 5. The voltage on the key stage, equal to the sum of the positive and negative polarity of node 5, is kept constant by the feedback signal zi from the output device. The impulse noise coming from the mains leads to the appearance of voltage surges on the secondary winding of the mains transformer, and regardless of the use of a transformer with a midpoint sp1 with two independent windings, the interference voltage always has an increasing positive polarity. Passing through a series of circuit elements, the interference voltage is added to the constant voltage on the key stage I2. The noise immunity of the device to impulse noise is due to the fact that they are applied to the key stage in anti-phase and then automatically compensated. The depth of suppression of impulse noise is determined by the symmetry of the secondary winding of the mains transformer of node 3 with respect to the common bus. In general, compared with known devices for which such suppression is absent and the output voltage is modulated by interference, the proposed device is more resistant to impulse noise, which indicates a higher conversion efficiency.

The advantage of the device is also the absence of powerful currents of the clutch cascade 12 in the common bus.

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Claims (1)

STABILIZED CONVERTER- VOLTAGE RATER, containing a key stage, the output of which through the voltage multiplying unit and a smoothing filter is connected to the output terminal ** and the common bus, an adjustable low DC voltage source, an operational amplifier, the first input of which is connected to the common bus, and the second input is connected to the source reference voltage directly and through a feedback resistor - with an output terminal, characterized in that, in order to increase noise immunity under conditions of pulsed noise, an adjustable source of a constant voltage is made bipolar and an inverting operational amplifier is introduced, while the common output of the adjustable voltage source is connected to a common bus, the key stage is connected between its terminals of positive and negative polarity, the output of the operational amplifier is connected to the input of the inverting operational amplifier and the first control input of the adjustable a voltage source, and the output of the inverting operational amplifier is connected to its second · control input.