SU1220079A1 - Stabilized voltage converter - Google Patents

Abstract

This invention relates to stabilized voltage converters for powering electronic devices. The purpose of the invention is to attenuate transient processes at the output, eliminate overload and reduce interference in the network. The converter contains an auxiliary node.

Description

power supply (OPS) 1, the input connected to the power supply source, the input of the threshold unit (PB) 20 and through the amplifier 13, the rectifier 14 and the filter 15 - with the output of the converter. The output of the OPS is connected to the input of another PB 16, the second input of the comparator (KJ 9 and the outputs of the keys 19, 21. Some of the outputs of the keys 19, 21 are connected to the outputs of PB 16 and 20. Their other inputs are connected to the common bus. The output of PB 16 is also connected to one of the inputs of the keys 17, 18, the other inputs of the selectors 5, 6 connected to the outputs. The outputs of the keys 17, 18 are connected through the matching amplifier 12 to the control input of the amplifier 13. The inputs of sec. 1

The invention relates to electrical engineering and can be used to form a stabilized supply voltage for electronic devices.

The purpose of the invention is to attenuate transients at the output, eliminate overload and reduce network interference.

The drawing shows a functional diagram of the device.

The device contains an auxiliary power supply unit 1, the input of which is connected to the input terminal, the master oscillator 2, the output of which is connected to the input of the sawtooth generator 3 and the input of the frequency divider 4, the two outputs of which are connected to the first inputs of the respective selectors 5 and 6, the second and the third inputs of which are connected to the outputs, respectively, of a pulse-width modulator 7 and a generator of increasing duration pulses 8 containing a comparator 9, the output of which is a code, and the first input is the input of a generator , the first terminals of the resistor 10 and the capacitor 11 are connected to the second input of the comparator 9, the second terminals of which are connected respectively to the output of the auxiliary node pi20079

The lecturers 5, 6 are connected to the outputs of frequency divider 4, pulse-width modulator (PWM) 7 and K 9. The first input K 9 is connected to one input of PWM and to the output of the sawtooth voltage former (FPN) 3. Second input of PWM 7 is connected to the output of the filter 15. The FPN input 3 is connected to the input of frequency divider 4 and the output of the master oscillator 2. The introduction of PB 20 and key 21 allows any variation of the output voltage under the influence of destabilizing factors to be compensated by changing the pulse width of the PWM output signal that ensures achieving goal. 1 il.

With the common bus, the output of the shaping and the inverter 3 of the sawtooth voltage is connected to the first input of the generator 8 of increasing duration pulses, the output of the matching amplifier 12 is connected to the control input of the power amplifier 13, the power input of which is connected to the input terminal, and to the output of the amplifier

13 are connected in series an optical starter 14 and a smoothing filter 15, the output of the latter is connected to the second input of a pulse-width modulator 7

and is the output of the converter; the output of the auxiliary node 1 is connected to the input of the threshold unit 16, the output of which is connected to the control inputs of the keys 17-19, two

from KOTopbix are connected between the outputs of the selectors 5 and 6 and the inputs of the corresponding amplifier 12, and the third between the common bus and the second input of the comparator 9 of the generator 8 pulses of increasing duration to the input of the auxiliary power node 1 is connected to the input of the additional threshold unit 20, the output of which is connected to the first input the fourth key 21, the second input of which is connected to the common bus, and the output is connected to the second input of the comparator 9 of a pulse generator of increasing duration.

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The device works as follows.

The auxiliary power unit 1 forms the supply voltage of the functional elements of the control device. The output pulse signal of the master oscillator 2 is supplied to the input of the driver 3 sawtooth voltage and through divide

4frequencies - to the first inputs of the selector

5 and 6. At the same time, during one period of the frequency of the master oscillator, the selector 5 was opened, and during the next period, the selector 6. The sawmill output voltage

3 is fed to the first input of the pulse-width modulator 7. From the output of the pulse-width modulator 7, through selectors 5 and 6, public keys 17 and 18 and matching amplifier 12 to the input of power amplifier 13 receives a pulse-width-modulated pulse signal. The output voltage of the power amplifier 13 through the rectifier 14 and the smoothing filter 15 is fed to the output of the device and to the second input of the pulse-width modulator 7. Any change in the output voltage of the device under the action of destabilizing factors leads to a change in the pulse width of the output signal of width -pulse modulator, which ensures the given stability of the output voltage of the device.

The device is turned on and works only when its output voltage is greater than the minimum allowable value for the entire device. In this case, the additional threshold unit 20 is turned on and the fourth key 21 is closed. When the device is turned on, when the output voltage of the auxiliary power node 1 is less than the minimum permissible value, the threshold unit .16 is in the off state, in which the keys 17 and 18 are closed, the key 19 is open, the capacitor 11 is discharged and the control signal to the input of the power amplifier 13 does not arrive. When the supply voltage of the control device reaches its allowable value, the threshold unit 16 is turned on, the signal from its output switches the keys 17 and 18, and the key 19 closes and the capacitance

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11 starts charging. In the process of charging the capacitor 11, the generator 8 generates with a frequency of the master oscillator 2 a sequence of 5 pulses of increasing duration, which alternately through the selectors 5 and 6 and the public keys 17 and 18 arrive at the inputs according to the amplifier 12, and its output is

fO input amplifier power 13 that

provides a smooth increase in the currents of the smoothing filter 15 and the power amplifier 13, as well as the current consumed from the network, and the output

15 voltage device.

When the output voltage of the device reaches its nominal value, the duration of the pulses arriving at the input of the amplifier is 13

20 power is limited by the duration of the pulses arriving at the second inputs of the selectors 5 and 6 from the output of the pulse-width modulator, which is far from

25 is the lowest regulation of the output voltage of the device.

At the end of the charge of the capacitor 11, the generator of 8 pulses of increasing duration is turned off. If a

30, after switching on the device, the input voltage will decrease to a value less than the minimum acceptable value for the whole device and higher than the minimum acceptable value for auxiliary power supply node 1, the output voltage of the device will decrease. Simultaneously, the additional threshold unit 20 is turned off, the fourth key 21 is opened, the capacitor 11 is discharged and the device is turned off. With a subsequent sharp increase in the input voltage to a value greater than the minimum acceptable value for the entire device, the latter begins to turn on. the threshold unit is turned on, the fourth switch 21 is closed, and the capacitor 11 starts charging. Further switching on of the device occurs in the above described sequence.

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In the process of switching off the device, when the input voltage becomes less than the minimum permissible value for the entire device, the additional threshold unit 20 is turned off, the fourth key 21 from 51

closes, the capacitor 11 is charged and the device is turned off. And after the output voltage of the control power unit is reduced to its minimum allowable value, the threshold unit 16 is turned off and the keys 17 and 18 are closed.

The device can be effectively used when large transients are not allowed at the output of the device, as well as when the permissible values of overloads and the level of interference in the supply network are substantially limited for any type of voltage change.

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Claims (1)

Claims of the invention Stabilized voltage converter according to the author. St. No. 1023310, characterized in that, 5 in order to attenuate transient processes at the output, eliminate overload and reduce noise in the network, an additional threshold unit and a fourth key are introduced into it, and The first input of the fourth key is connected to the output of the additional threshold unit, the input of which is connected to the input of the auxiliary power unit, the second input of the fourth key of that key is connected to the common bus, and its output is connected to the second input of the comparator of the pulse generator of increasing duration.