SU1686418A1 - Voltage stabilizer - Google Patents

Abstract

The invention relates to electronic equipment and can be used in the development of sources of secondary power supply of electronic equipment for various purposes. The aim of the invention is to reduce the ripple and instability of the output voltage by providing a constant switching frequency of the electronic key in a wide range of input voltage variation. The stabilizer contains an electronic switch 2, an LCD filter 3, a threshold node 5, a source 6 of a threshold voltage, an RC trigger 7, a DC amplifier 9 and a controlled one-shot 11. The synchronization of the HC-trigger 7 is effected by pulses from the controlled output a single vibrator 11, the duration of which is determined by the magnitude of the input voltage. This ensures that the stabilizer synchronization frequency does not fail at an input voltage that is just over or above the output voltage. 2 Il. J

Description

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The invention relates to the elementary technique and can be used in the development of sources of secondary power supply for various electronic equipment.

The aim of the invention is to reduce the ripple and instability of the output voltage by providing a constant switching frequency of the electronic key in a wide range of input voltage variation.

FIG. 1 shows a block diagram of a stabilizer; FIG. 2 is a diagram of voltages explaining the operation of the device.

The stabilizer (FIG. 1) contains master i generator 1, electronic switch 2, LCD filter 3, first voltage divider 4, threshold node 5, threshold voltage source 6, RC trigger 7, second voltage divider 8, amplifier 9 constant current source 10 voltage reference, controlled by a single vibrator 11.

In the voltage regulator, the input of the key 2 and the input of the second divider 8 are connected to the input terminal. The output of the key 2 through the LCD filter 3 is connected to the output terminal and to the input of the first divider 4, the output of which is connected to the first input of the threshold unit. 5. A source 6 of the threshold voltage is connected to the second input of the threshold node 5. The output of the threshold node 5 is connected to the S input of the RS-flip-flop 7, the input of which is connected to the output of the controlled single-oscillator 11, and to the output of the control input of the electronic key 2 To the clock input of the controlled single-oscillator 11 is connected the master oscillator 1, and to the control output of the output DC amplifier 9 To one of the outputs of the DC amplifier 9, a source 10 is connected to the reference voltage -inq, and to the other is the output of the second voltage divider P

DC Voltage Stabilizer works in the same way.

The generator 1 generates pulses from the output (FIG. 2a) in each period. “Euppe controlled one-shot 11. In which (J p-i-nypT sync pulses (fig. 26) Keldia sync pulse, goes to R-rac Rb-rigger 7, causes its activation B-moment by the signal from the RS output of the tripso 7 locks the electronic battery 2 (Fig. 2o). This starts the reduction of the voltage on the LCD output of the filter 3 (Fig. 2 g) The voltage from the LCD output of the filter 3 through the control divider A napr from is transmitted at one of the inputs of the threshold node 5 When the voltage at the output of n ° rpgn That is, m / m l 1 becomes naked rchch enich

equal to the threshold at the output of the source 6 of the threshold voltage, triggered node 5 is triggered

arriving at its S input, and the electronic key 2 is unlocked. The voltage at the output of the LCD filter 3 begins to increase. After the arrival of the next sync pulse, the cycle repeats.

The duration of the sync pulses at the output of the controlled single vibrator 11 is varied by the feedback amplifier 9 in accordance with the signal input to the amplifier through the second divider 8, the voltage from the output of the DC source (when increasing the input voltage, the duration of the sync pulse decreases, while decreasing For example, the diagrams of Fig. 26 in g correspond to the case when the input voltage of the device is 1.5 times the output voltage.

Diagrams of sync pulses of one-shot 11 (}. And d 2d) at the output of the RS flip-flop 7

(Fig. 2e) and at the output of the LCD filter (Fig. 2g) correspond to the case when the input voltage is more than 2 times the output voltage.

With short synchronization pulses of the RS flip-flop 7, the electronic switch 2 can operate with a switching frequency half the frequency of the master oscillator if the input voltage of the stabilizer is two or more times greater than the output

This disadvantage is due to the fact that when the input voltage exceeds the output voltage by two or more times, the duty cycle of the pulses at the output of the electronic key is two or more

frequency in the pause between pulses are placed two pulses of the master oscillator 1, the first of which locks the electronic key 2, as provided for by the structure of the device and the second (idle)

does not change the key state. Frequency failure may occur as a result of a transient process, for example, when the device is turned on, when output voltage spikes occur.

the ripple amplitude of the output voltage of the device becomes twice as large as the normal mode of operation. To eliminate this drawback, the duration of the clock pulses (g) should

vary with the input voltage and satisfy the following inequalities

t at LV 2nd

t ti,

where T is the duration of the pulse following period of the master oscillator;

ti is the duration of the pause between pulses at the output of the electronic key during normal operation of the device.

The fulfillment of the first inequality is necessary to eliminate the possibility of frequency failure, which leads to an increase in the output voltage ripple. The fulfillment of the second inequality is necessary to maintain a high stability of the output voltage. The second inequality must be satisfied in the entire range of input voltage variation.

The positive effect is to reduce the amplitude of the output voltage ripple and, consequently, to increase stability. In this case, the size and weight of the smoothing filters at the output of the secondary power supply sources can be reduced, reliability increases and the service life of electronic equipment as a whole increases.

Claims (1)

Claims of an Inverter DC Voltage Stabilizer comprising an electronic key and an LCD filter connected in series between the input and output pins, the first voltage divider input connected to the output output, output to the first input of the threshold node, the second input of which is connected to the source of the threshold voltage , the output of the threshold node is connected to the S-input of the RS-flip-flop, the output of which is connected to the control input of the electronic key, and a master oscillator, characterized in that, in order to reduce pulsations and non-stab nosti output voltage by providing a constant switching frequency of the electronic key in a wide range of input voltage, a second voltage divider, a dc amplifier, a voltage source and a controlled one-oscillator are inserted in it, the input of the second voltage divider being connected to the input terminal, and its output - with the first input of the DC amplifier, the second input of which is connected to the source of the reference voltage, the output of the DC amplifier is connected to the control input of the controlled one-oscillator, whose start input with union of yield master oscillator output controlled monoflop is connected to the input of R- RS-trigger, the minimum duration t at the output clock controlled monostable condition selected from t T / 2 when 2iVyh, where T is the duration of the pulse sequencer oscillator period. i P g and and 1